Bio


Professor Enge designs navigation systems that are safe and secure. He has worked on such systems for maritime and air applications. Two of these navigation systems have been deployed worldwide. He received his B.S.E.E. from the University of Massachusetts, and his M.S.E.E. and PhD from the University of Illinois. Today, he is the Vance and Arlene Coffman Professor of Engineering at Stanford University, where he directs the Stanford Center for Position Navigation and Time.

Academic Appointments


Administrative Appointments


  • Director, Stanford Center for Position Navigation and Time (2006 - Present)

Honors & Awards


  • GNSS Signals Award, GPS World Magazine (2013)
  • Inducted into the GPS Hall of Fame, United States Air Force (2012)
  • Summerfield Award, AIAA (2011)
  • Michael Richey Medal, Royal Institute of Navigation (2010)
  • Distinguished Alumni, Department of Electrical and Computer Engineering at the University of Illinois (2006)
  • Elected Member, National Academy of Engineernig (2005)
  • Fellow, Institute of Navigation (2001)
  • Fellow, IEEE (2000)
  • Kepler Award, Institute of Navigation (2000)
  • Burka Award, Institute of Navigation (1997)
  • Thurlow Award, Institute of Navigation (1996)

Boards, Advisory Committees, Professional Organizations


  • Member, Space-Based Position Navigation and Time Federal Advisory Committee (FACA) (2007 - Present)

Professional Education


  • PhD, Illinois (1983)

Current Research and Scholarly Interests


Professor Enge designs navigation systems that are safe and secure. These navigation systems must detect feared events that threaten to introduce hazardous position errors. To simultaneously provide continuity of navigation, these systems must automatically isolate and exclude such threats. These days, such navigation systems are usually based on the Global Positioning System (GPS) with substantive toughening and augmentation. Applications of current interest include the landing of airplanes and un-piloted air systems (UAS).

All Publications


  • A Simple Position Estimator That Improves Advanced RAIM Performance IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS Blanch, J., Walter, T., Enge, P., Kropp, V. 2015; 51 (3): 2485-U960
  • Design of a Passive Ranging System Using Existing Distance Measuring Equipment (DME) Signals & Transmitters NAVIGATION-JOURNAL OF THE INSTITUTE OF NAVIGATION Lo, S. C., Enge, P. K., Narins, M. J. 2015; 62 (2): 131-149

    View details for DOI 10.1002/navi.83

    View details for Web of Science ID 000357031000004

  • GNSS Multipath and Jamming Mitigation Using High-Mask-Angle Antennas and Multiple Constellations IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS Heng, L., Walter, T., Enge, P., Gao, G. X. 2015; 16 (2): 741-750
  • Baseline Advanced RAIM User Algorithm and Possible Improvements IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS Blanch, J., Walker, T., Enge, P., Lee, Y., Pervan, B., Rippl, M., Spletter, A., Kropp, V. 2015; 51 (1): 713-732
  • Modelling the Galileo Full Operational Capability (FOC) Transmit Antenna and its Impact on Future Space Missions PROCEEDINGS OF THE 2014 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION Ramakrishnan, S., Enge, P. 2014: 813-824
  • Development of a Real-time GNSS Software Receiver for Evaluating RAIM in Multi-constellation PROCEEDINGS OF THE 2014 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION Chen, Y., Lo, S., Akos, D. M., Choi, M., Blanch, J., Walter, T., Enge, P. 2014: 525-533
  • The Effect of Nominal Signal Deformations on ARAIM Users PROCEEDINGS OF THE 2014 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION Phelts, R. E., Blanch, J., Walter, T., Enge, P. 2014: 56-67
  • Containing a Difficult Target: Techniques for Mitigating DME Multipath to Alternative Position Navigation and Timing (APNT) PROCEEDINGS OF THE 2014 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION Lo, S., Chen, Y. H., Segal, B., Peterson, B., Enge, P., Erikson, R., Lilley, R. 2014: 413-423
  • Exclusion for Advanced RAIM: Requirements and a Baseline Algorithm PROCEEDINGS OF THE 2014 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION Blanch, J., Walter, T., Enge, P. 2014: 99-107
  • Reduced Subset Analysis for Multi-Constellation ARAIM PROCEEDINGS OF THE 2014 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION Walter, T., Blanch, J., Enge, P. 2014: 89-98
  • DME/TACAN interference mitigation for GNSS: algorithms and flight test results GPS SOLUTIONS Gao, G. X., Heng, L., Hornbostel, A., Denks, H., Meurer, M., Walter, T., Enge, P. 2013; 17 (4): 561-573
  • Using Outage History to Exclude High-Risk Satellites from GBAS Corrections NAVIGATION-JOURNAL OF THE INSTITUTE OF NAVIGATION Pullen, S., Enge, P. 2013; 60 (1): 41-51

    View details for DOI 10.1002/navi.20

    View details for Web of Science ID 000339565800004

  • Critical Elements for a Multi-Constellation Advanced RAIM NAVIGATION-JOURNAL OF THE INSTITUTE OF NAVIGATION Blanch, J., Walter, T., Enge, P., Wallner, S., Fernandez, F. A., Dellago, R., Ioannides, R., Hernandez, I. F. 2013; 60 (1): 53-69

    View details for DOI 10.1002/navi.29

    View details for Web of Science ID 000339565800005

  • Results on the Optimal Detection Statistic for Integrity Monitoring PROCEEDINGS OF THE 2013 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION Blanch, J., Walter, T., Enge, P. 2013: 262-273
  • Optimal Positioning for Advanced Raim NAVIGATION-JOURNAL OF THE INSTITUTE OF NAVIGATION Blanch, J., Walter, T., Enge, P. 2013; 60 (4): 279-289

    View details for DOI 10.1002/navi.49

    View details for Web of Science ID 000339567500003

  • Near Term Improvements to WAAS Availability Blanch, J., Walter, T., Phelts, R., Eric, Enge, P. 2013
  • Constructing Ionospheric Irregularity Threat Model for Korean SBAS Bang, E., Lee, J., Lee, J., Seo, J., Walter, T. 2013
  • Local-Area Differential GNSS Architectures Optimized to Support Unmanned Aerial Vehicles (UAVs) Pullen, S., Enge, P., Lee, J. 2013
  • Results on the Optimal Detection Statistic for Integrity Monitoring Blanch, J., Walter, T., Enge, P. 2013
  • L1/L5 SBAS MOPS Ephemeris Message to Support Multiple Orbit Classes Reid, T., Walter, T., Enge, P. 2013
  • Distance Measuring Equipment Accuracy Performance Today and for Future Alternative Position Navigation and Timing (APNT) Lo, S., Chen, Y. H., Enge, P., Peterson, B., Erikson, R., Lilley, R. 2013
  • Validation of a Controlled Reception Pattern Antenna (CRPA) Receiver Built from Inexpensive General-purpose Elements During Several Live Jamming Test Campaigns PROCEEDINGS OF THE 2013 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION Chen, Y., Lo, S., Akos, D. M., De Lorenzo, D. S., Enge, P. 2013: 154-163
  • L1/L5 SBAS MOPS Ephemeris Message to Support Multiple Orbit Classes PROCEEDINGS OF THE 2013 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION Reid, T., Walter, T., Enge, P. 2013: 78-92
  • Multipath Benefits of BOC vs. BPSK Modulated Signals Using On-Air Measurements Lee, C., Chen, Y., Wong, G., Lo, S., Enge, P. 2013
  • Incorporating GLONASS into Aviation RAIM Receivers Walter, T., Blanch, J., Choi, M., Reid, T., Enge, P. 2013
  • Multipath Benefits of BOC vs. BPSK Modulated Signals Using On-Air Measurements PROCEEDINGS OF THE 2013 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION Lee, C., Chen, Y., Wong, G., Lo, S., Enge, P. 2013: 742-751
  • Validation of a Controlled Reception Pattern Antenna (CRPA) Receiver Built from Inexpensive General-purpose Elements During Several Live Jamming Test Campaigns Chen, Y., Lo, S., Akos, D., De Lorenzo, D., Enge, P. 2013
  • The Impact of GPS Modernization on Standalone User Performance and Integrity with ARAIM Pullen, S., Enge, P., Shaw, S., Frey, C., Frye, J., Souder, M. 2013
  • Using Outage History to Exclude High-Risk Satellites from GBAS Corrections Published in Navigation Pullen, S., Enge, P. 2013; 60 (1): 41-51
  • Near Term Improvements to WAAS Availability PROCEEDINGS OF THE 2013 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION Blanch, J., Walter, T., Phelts, R. E., Enge, P. 2013: 71-77
  • Managing Separation of Unmanned Aerial Vehicles Using High-Integrity GNSS Navigation Enge, P., PerPullen, S. 2013
  • Implementation of the L5 SBAS MOPS Walter, T., Blanch, J., Enge, P. 2013
  • Qualifying an L5 SBAS MOPS Ephemeris Message to Support Multiple Orbit Classes Reid, T., Walter, T., Enge, P. 2013
  • Signal Deformation Monitoring for Dual-Frequency WAAS Phelts, R., Eric, Wong, G., Walter, T., Enge, P. 2013
  • Guidance, Navigation, and Separation Assurance for Local-Area UAV Networks: Putting the Pieces Together Enge, P., Lee, J. 2013
  • Incorporating GLONASS into Aviation RAIM Receivers PROCEEDINGS OF THE 2013 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION Walter, T., Blanch, J., Choi, M. J., Reid, T., Enge, P. 2013: 239-249
  • Leveraging the L1Composite Signal to enable autonomous navigation at GEO and beyond Ramakrishnan, S., Reid, T., Enge, P. 2013
  • Signal Deformation Monitoring for Dual-Frequency WAAS PROCEEDINGS OF THE 2013 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION Phelts, R. E., Wong, G., Walter, T., Enge, P. 2013: 93-106
  • How Many GNSS Satellites are Too Many? IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS Xingxin, G., Enge, P. 2012; 48 (4): 2865-2874
  • Design and Implementation of Real-Time Software Radio for Anti-Interference GPS/WAAS Sensors SENSORS Chen, Y., Juang, J., Seo, J., Lo, S., Akos, D. M., De Lorenzo, D. S., Enge, P. 2012; 12 (10): 13417-13440

    Abstract

    Adaptive antenna array processing is widely known to provide significant anti-interference capabilities within a Global Navigation Satellite Systems (GNSS) receiver. A main challenge in the quest for such receiver architecture has always been the computational/processing requirements. Even more demanding would be to try and incorporate the flexibility of the Software-Defined Radio (SDR) design philosophy in such an implementation. This paper documents a feasible approach to a real-time SDR implementation of a beam-steered GNSS receiver and validates its performance. This research implements a real-time software receiver on a widely-available x86-based multi-core microprocessor to process four-element antenna array data streams sampled with 16-bit resolution. The software receiver is capable of 12 channels all-in-view Controlled Reception Pattern Antenna (CRPA) array processing capable of rejecting multiple interferers. Single Instruction Multiple Data (SIMD) instructions assembly coding and multithreaded programming, the key to such an implementation to reduce computational complexity, are fully documented within the paper. In conventional antenna array systems, receivers use the geometry of antennas and cable lengths known in advance. The documented CRPA implementation is architected to operate without extensive set-up and pre-calibration and leverages Space-Time Adaptive Processing (STAP) to provide adaptation in both the frequency and space domains. The validation component of the paper demonstrates that the developed software receiver operates in real time with live Global Positioning System (GPS) and Wide Area Augmentation System (WAAS) L1 C/A code signal. Further, interference rejection capabilities of the implementation are also demonstrated using multiple synthetic interferers which are added to the live data stream.

    View details for DOI 10.3390/s121013417

    View details for Web of Science ID 000310507800027

    View details for PubMedID 23202002

  • GPS Signal-in-Space Integrity Performance Evolution in the Last Decade IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS Heng, L., Gao, G. X., Walter, T., Enge, P. 2012; 48 (4): 2932-2946
  • Satellite Navigation for Aviation in 2025 PROCEEDINGS OF THE IEEE Blanch, J., Walter, T., Enge, P. 2012; 100: 1821-1830
  • Calibrating adaptive antenna arrays for high-integrity GPS GPS SOLUTIONS De Lorenzo, D. S., Lo, S. C., Enge, P. K., Rife, J. 2012; 16 (2): 221-230
  • Targeted Parameter Inflation Within Ground-Based Augmentation Systems to Minimize Anomalous Ionospheric Impact JOURNAL OF AIRCRAFT Seo, J., Lee, J., Pullen, S., Enge, P., Close, S. 2012; 49 (2): 587-599

    View details for DOI 10.2514/1.C031601

    View details for Web of Science ID 000302758400023

  • Statistical Characterization of GLONASS Broadcast Clock Errors and Signal-In-Space Errors PROCEEDINGS OF THE 2012 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION Heng, L., Gao, G. X., Walter, T., Enge, P. 2012: 1697-1707
  • Evolving WAAS to Serve L1/L5 Users NAVIGATION-JOURNAL OF THE INSTITUTE OF NAVIGATION Walter, T., Blanch, J., Phelts, R. E., Enge, P. 2012; 59 (4): 317-327

    View details for DOI 10.1002/navi.21

    View details for Web of Science ID 000209006500006

  • Capacity Study of Multilateration (MLAT) based Navigation for Alternative Position Navigation and Timing (APNT) Services for Aviation NAVIGATION-JOURNAL OF THE INSTITUTE OF NAVIGATION Lo, S. C., Enge, P. 2012; 59 (4): 263-279

    View details for DOI 10.1002/navi.25

    View details for Web of Science ID 000209006500002

  • Assessing the Capability of Distance Measuring Equipment (DME) to Support Future Air Traffic Capacity NAVIGATION-JOURNAL OF THE INSTITUTE OF NAVIGATION Lo, S. C., Enge, P. 2012; 59 (4): 249-261

    View details for DOI 10.1002/navi.24

    View details for Web of Science ID 000209006500001

  • Measuring Code-Phase Differences Due to Inter-Satellite Hardware Differences Wong, G., Chen, Y., Phelts, R., Eric, Walter, T., Enge, P. 2012
  • The Benefit of Alternative Position, Navigation, and Timing (APNT) to Aviation and Other User Communities for Precise Time and Frequency Services Enge, Per, K., Narins, M., Lo, S. 2012
  • Data Quality Improvements and Applications of Long-Term Monitoring of Ionospheric Anomalies for GBAS Enge, P., Kim, M., Lee, J., Pullen, S., Gillespie, J. 2012
  • Design and Implementation of Real-Time a Software Radio for Anti-Interference GPS/WAAS Sensors Published in Sensors Chen, Y, H., Juang, J. C., Seo, J., Lo, S., C, Akos, D., M., De Lorenzo, D., S., Enge, P. K. 2012: 13417-40
  • Detection of False GNSS Signals Using AGC Published by GPS World in April 2012 Enge, P., Borowski, H., Isoz, O., Eklf, F., M., Lo, S., Akos, D. 2012
  • Results from Automated Ionospheric Data Analysis for Ground-Based Augmentation Systems (GBAS) Enge, P., Lee, J., Jung, S., Kim, M., Seo, J., Pullen, S. 2012
  • A Study of Geometry and Commercial-Off-The-Shelf (COTS) Antennas for Controlled Reception Pattern Antenna (CRPA) Arrays Enge, P., Chen, Y. 2012
  • Automated Verification of Potential Signal-In-Space Anomalies Using Ground Observation Data Heng, L., Gao, Grace, X., Walter, T., Enge, P. 2012
  • GPS Signal-in-Space Integrity Performance Evolution in the Last Decade: Data Mining 400,000,000 Navigation Messages from a Global Network of 400 Receivers Published in IEEE Transactions on Aerospace and Electronic Systems Heng, L., Gao, Grace, X., Walter, T., Enge, P. 2012; 48 (4)
  • Impact of Personal Privacy Devices for WAAS Aviation Users PROCEEDINGS OF THE 25TH INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2012) Gao, G. X., Gunning, K., Walter, T., Enge, P. 2012: 235-241
  • Advanced RAIM User Algorithm Description: Integrity Support Message Processing, Fault Detection, Exclusion, and Protection Level Calculation PROCEEDINGS OF THE 25TH INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2012) Blanch, J., Walter, T., Enge, P., Lee, Y., Pervan, B., Rippl, M., Spletter, A. 2012: 2828-2849
  • L1/L5 SBAS MOPS to Support Multiple Constellations Walter, T., Blanch, J., Enge, P. 2012
  • A Framework for Analyzing Architectures that Support ARAIM Walter, T., Blanch, J., Enge, P. 2012
  • Measuring Code-Phase Differences due to Inter-Satellite Hardware Differences PROCEEDINGS OF THE 25TH INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2012) Wong, G., Chen, Y., Phelts, R. E., Walter, T., Enge, P. 2012: 2150-2158
  • Signal Structure Study for a Passive Ranging System using Existing Distance Measuring Equipment (DME) Lo, S., Enge, P. 2012
  • The Need for a Robust Precise Time and Frequency Alternative to Global Navigation Satellite Systems Narins, M., Lo, S. 2012
  • GLONASS Signal-in-Space Anomalies Since 2009 Heng, L., Gao, Grace, X., Walter, T., Enge, P. 2012
  • SBAS Error Modeling for Category I Autoland Enge, P., Azoulai, L.., Neri, P., Milner, C., Macabiau, C., Walter, T. 2012
  • Advanced RAIM User Algorithm Description: Integrity Support Message Processing, Fault Detection, Exclusion, and Protection Level Calculation Blanch, J., Walter, T., Enge, P., Lee, Y., Pervan, B., Rippl, M. 2012
  • Calibrating adaptive antenna arrays for high-integrity GPS Published by GPS Solutions De Lorenzo, D., Rife, J., Lo, S., Enge, P. 2012; 16 (2): 221-30
  • GNSS Augmentations: When A Signal in Space Isn't Enough Published in Inside GNSS Enge, P., Walter, T. 2012
  • Orbital Diversity for Satellite Navigation PROCEEDINGS OF THE 25TH INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2012) Enge, P., Ferrell, B., Bennett, J., Whelan, D., Gutt, G., Lawrence, D. 2012: 3834-3846
  • L1/L5 SBAS MOPS to Support Multiple Constellations PROCEEDINGS OF THE 25TH INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2012) Walter, T., Blanch, J., Enge, P. 2012: 1287-1297
  • Evaluation of Multi-Constellation Advanced RAIM for Vertical Guidance using GPS and GLONASS Signals with Multiple Faults PROCEEDINGS OF THE 25TH INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2012) Choi, M., Blanch, J., Walter, T., Akos, D., Enge, P. 2012: 884-892
  • A Framework for Analyzing Architectures that Support ARAIM PROCEEDINGS OF THE 25TH INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2012) Walter, T., Blanch, J., Enge, P. 2012: 2850-2857
  • Impact of Personal Privacy Devices for WAAS Aviation Users Gao, G. X., Gunning, K., Walter, T., Enge, P. 2012
  • Mixed One-way and Two-way Ranging to Support Alternative Position Navigation and Timing Enge, P., Chu, J. 2012
  • Satellite Navigation for Aviation in 2025 Blanch, J., Walter, T., Enge, P. 2012
  • The Impact of Uninformed RF Interference on GBAS and Potential Mitigations Enge, P., Pullen, S., Gao, G., Tedeschi, C., Warburton, J. 2012
  • GNSS and SBAS System of Systems: Considerations for Applications in the Arctic Enge, P., Sundlisaeter, T., Reid, T., Johnson, C., Wan, S. 2012
  • Automated Ionosphere Front Velocity Estimation Algorithm for Ground-Based Augmentation Systems Enge, P., Bang, E., Lee, J., Seo, J., Pullen, S., Close, S. 2012
  • Innovation: Ionospheric Scintillations Published in GPS World Enge, P. 2012
  • Targeted Parameter Inflation Within Ground-Based Augmentation Systems to Minimize Anomalous Ionospheric Impact Published in Journal of Aircraft Seo, J., Lee, J., Pullen, S., Enge, P., Close, S. 2012; 49 (2)
  • GNSS Jamming in the Name of Privacy: Potential Threat to GPS Aviation Published by Inside GNSS March Enge, P., Pullen, S., Gao, Grace, X. 2012
  • GLONASS Signal-in-Space Anomalies Since 2009 PROCEEDINGS OF THE 25TH INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2012) Heng, L., Gao, G. X., Walter, T., Enge, P. 2012: 833-842
  • Automated Verification of Potential GPS Signal-In-Space Anomalies Using Ground Observation Data 2012 IEEE/ION POSITION LOCATION AND NAVIGATION SYMPOSIUM (PLANS) Heng, L., Gao, G. X., Walter, T., Enge, P. 2012: 1111-1118
  • OPTIMAL POSITIONING FOR ADVANCED RAIM PROCEEDINGS OF THE 2012 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION Blanch, J., Walter, T., Enge, P. 2012: 1624-1631
  • Signal Structure Study for a Passive Ranging System using Existing Distance Measuring Equipment (DME) PROCEEDINGS OF THE 2012 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION Lo, S. C., Enge, P. K. 2012: 97-107
  • Observations of low-elevation ionospheric anomalies for ground-based augmentation of GNSS RADIO SCIENCE Lee, J., Datta-Barua, S., Zhang, G., Pullen, S., Enge, P. 2011; 46
  • A Real-Time Capable Software-Defined Receiver Using GPU for Adaptive Anti-Jam GPS Sensors SENSORS Seo, J., Chen, Y., De Lorenzo, D. S., Lo, S., Enge, P., Akos, D., Lee, J. 2011; 11 (9): 8966-8991

    Abstract

    Due to their weak received signal power, Global Positioning System (GPS) signals are vulnerable to radio frequency interference. Adaptive beam and null steering of the gain pattern of a GPS antenna array can significantly increase the resistance of GPS sensors to signal interference and jamming. Since adaptive array processing requires intensive computational power, beamsteering GPS receivers were usually implemented using hardware such as field-programmable gate arrays (FPGAs). However, a software implementation using general-purpose processors is much more desirable because of its flexibility and cost effectiveness. This paper presents a GPS software-defined radio (SDR) with adaptive beamsteering capability for anti-jam applications. The GPS SDR design is based on an optimized desktop parallel processing architecture using a quad-core Central Processing Unit (CPU) coupled with a new generation Graphics Processing Unit (GPU) having massively parallel processors. This GPS SDR demonstrates sufficient computational capability to support a four-element antenna array and future GPS L5 signal processing in real time. After providing the details of our design and optimization schemes for future GPU-based GPS SDR developments, the jamming resistance of our GPS SDR under synthetic wideband jamming is presented. Since the GPS SDR uses commercial-off-the-shelf hardware and processors, it can be easily adopted in civil GPS applications requiring anti-jam capabilities.

    View details for DOI 10.3390/s110908966

    View details for Web of Science ID 000295211700046

    View details for PubMedID 22164116

  • Availability Impact on GPS Aviation due to Strong Ionospheric Scintillation IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS Seo, J., Walter, T., Enge, P. 2011; 47 (3): 1963-1973
  • Ionospheric Threat Mitigation by Geometry Screening in Ground-Based Augmentation Systems JOURNAL OF AIRCRAFT Lee, J., Seo, J., Park, Y. S., Pullen, S., Enge, P. 2011; 48 (4): 1422-1433

    View details for DOI 10.2514/1.C031309

    View details for Web of Science ID 000293876700033

  • Correlation of GPS signal fades due to ionospheric scintillation for aviation applications ADVANCES IN SPACE RESEARCH Seo, J., Walter, T., Enge, P. 2011; 47 (10): 1777-1788
  • SBAS and GBAS Integrity for Non-Aviation Users: Moving Away from "Specific Risk" PROCEEDINGS OF THE 2011 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION Pullen, S., Walter, T., Enge, P. 2011: 533-545
  • Evolving WAAS to Serve L1/L5 Users Walter, T., Blanch, J., Phelts, R., Eric, Enge, P. 2011
  • Breaking the Ice: Navigation in the Arctic Published by Inside GNSS Magazine Gao, Grace, X., Heng, L., Walter, T., Enge, P. 2011; 6 (5): 60-64
  • First Signal in Space Analysis of GLONASS K-1 Thoelert, S., Erker, S., Furthner, J., Meurer, M., Gao, Grace, X., Heng, L., Enge, P. K. 2011
  • Alternative Position Navigation & Timing (APNT) Based on Existing DME and UAT Ground Signals, Lo, S., Peterson, B., Akos, D., Narins, M., Loh, R., Enge, P. 2011
  • Digging into GPS Integrity: Charting the Evolution of Signal-in-Space Performance by Data Mining 400,000,000 Navigation Messages Published by GPS World Heng, L., Gao, Grace, X., Walter, T., Enge, P. 2011; 22 (11): 44-9
  • Enhancements of Long Term Ionospheric Anomaly Monitoring for the Ground-Based Augmentation System Enge, P., Lee, J., Jung, S., Pullen, S. 2011
  • Bounding Errors Caused by Nominal GNSS Signal Deformations Wong, G., Phelts, R., Eric, Walter, T., Enge, P. 2011
  • Using Outage History to Exclude High-Risk Satellites from GBAS Corrections Pullen, S., Enge, P. 2011
  • Demonstrations of Multi-Constellation Advanced RAIM for Vertical Guidance Using GPS and GLONASS Signals Choi, M., Blanch, J., Akos, D., Heng, L., Gao, G., Walter, T., Enge, P. K. 2011
  • Availability Impact on GPS Aviation due to Strong Ionospheric Scintillation Published in IEEE Transactions on Aerospace and Electronic Systems Seo, J., Walter, T., Enge, P. 2011
  • Statistical Characterization of GLONASS Broadcast Ephemeris Errors Heng, L., Gao, G., Walter, T., Enge, P. 2011
  • Real-Time Dual-Frequency (L1/L5) GPS/WAAS Software Receiver Chen, Y., Juang, J., Lorenzo, D. D., Seo, J., Lo, S., Enge, P. 2011
  • A Proposal for Multi-Constellation Advanced RAIM for Vertical Guidance Blanch, J., Walter, T., Enge, P., Waller, S., Fernandez, F., Dellago, R. 2011
  • A Clock and Ephemeris Algorithm for Dual Frequency SBAS Blanch, J., Walter, T., Enge, P. 2011
  • Integrity for Non-Aviation Users Published in GPS World Pullen, S., Walter, T., Enge, P. 2011
  • Ionospheric Threat Mitigation by Geometry Screening in Ground-Based Augmentation Systems Published in Journal of Aircraft Lee, J., Seo, J., Park, Y. S., Pullen, S., Enge, P. 2011
  • Real-Time Software Receiver Using Massively Parallel Processors for GPS Adaptive Antenna Array Processing (PRESENTATION) Seo, J., Yu-Hsuan, C., Lorenzo, D. D., Lo, S., Enge, P., Akos, D. 2011
  • A Real-Time Capable Software-Defined Receiver Using GPU for Adaptive Anti-Jam GPS Sensors Published in Sensors Seo, J., Chen, Y., De Lorenzo, D., Lo, S., Walter, T., Enge, P. 2011
  • Correlation of GPS signal fades due to ionospheric scintillation for aviation applications Published in IEEE Transactions on Aerospace and Electronic Systems Seo, J., Walter, T., Enge, P. 2011: 1777-88
  • Demonstrations of Multi-Constellation Advanced RAIM for Vertical Guidance using GPS and GLONASS Signals PROCEEDINGS OF THE 24TH INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2011) Choi, M., Blanch, J., Akos, D., Heng, L., Gao, G., Walter, T., Enge, P. 2011: 3227-3234
  • Alternative Position Navigation & Timing (APNT) Based on Existing DME and UAT Ground Signals PROCEEDINGS OF THE 24TH INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2011) Lo, S. C., Peterson, B., Akos, D., Narins, M., Loh, R., Enge, P. 2011: 3309-3317
  • Alternative Characterization of Analog Signal Deformation for GNSS-GPS Satellites PROCEEDINGS OF THE 2011 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION Wong, G., Phelts, R. E., Walter, T., Enge, P. 2011: 497-507
  • Optimization of a Vertical Protection Level Equation for Dual Frequency SBAS PROCEEDINGS OF THE 2011 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION Blanch, J., Walter, T., Enge, P. 2011: 459-463
  • Statistical Characterization of GLONASS Broadcast Ephemeris Errors PROCEEDINGS OF THE 24TH INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2011) Heng, L., Gao, G. X., Walter, T., Enge, P. 2011: 3109-3117
  • Evolving WAAS to Serve L1/L5 Users PROCEEDINGS OF THE 24TH INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2011) Walter, T., Blanch, J., Phelts, R. E., Enge, P. 2011: 2495-2504
  • Breaking the Ice: Navigation in the Arctic PROCEEDINGS OF THE 24TH INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2011) Gao, G. X., Heng, L., Walter, T., Enge, P. 2011: 3767-3772
  • Using Outage History to Exclude High-Risk Satellites from GBAS Corrections PROCEEDINGS OF THE 24TH INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2011) Pullen, S., Enge, P. 2011: 3040-3051
  • A Proposal for Multi-Constellation Advanced RAIM for Vertical Guidance PROCEEDINGS OF THE 24TH INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2011) Blanch, J., Walter, T., Enge, P., Wallner, S., Fernandez, F. A., Dellago, R., Ioannides, R., Pervan, B., Hernandez, I. F. 2011: 2665-2680
  • Bounding Errors Caused by Nominal GNSS Signal Deformations PROCEEDINGS OF THE 24TH INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2011) Wong, G., Phelts, R. E., Walter, T., Enge, P. 2011: 2657-2664
  • Statistical Characterization of GPS Signal-In-Space Errors PROCEEDINGS OF THE 2011 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION Heng, L., Gao, G. X., Walter, T., Enge, P. 2011: 312-319
  • Advanced RAIM Demonstration using Four Months of Ground Data PROCEEDINGS OF THE 2011 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION Choi, M., Blanch, J., Walter, T., Enge, P. 2011: 279-284
  • A Clock and Ephemeris Algorithm for Dual Frequency SBAS PROCEEDINGS OF THE 24TH INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2011) Blanch, J., Walter, T., Enge, P. 2011: 2513-2519
  • Capacity Study of Two Potential Alternative Position Navigation and Timing (APNT) Services for Aviation PROCEEDINGS OF THE 2011 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION Lo, S. C., Enge, P. 2011: 192-205
  • Reliable Location-Based Services from Radio Navigation Systems SENSORS Qiu, D., Boneh, D., Lo, S., Enge, P. 2010; 10 (12): 11369-11389

    Abstract

    Loran is a radio-based navigation system originally designed for naval applications. We show that Loran-C's high-power and high repeatable accuracy are fantastic for security applications. First, we show how to derive a precise location tag--with a sensitivity of about 20 meters--that is difficult to project to an exact location. A device can use our location tag to block or allow certain actions, without knowing its precise location. To ensure that our tag is reproducible we make use of fuzzy extractors, a mechanism originally designed for biometric authentication. We build a fuzzy extractor specifically designed for radio-type errors and give experimental evidence to show its effectiveness. Second, we show that our location tag is difficult to predict from a distance. For example, an observer cannot predict the location tag inside a guarded data center from a few hundreds of meters away. As an application, consider a location-aware disk drive that will only work inside the data center. An attacker who steals the device and is capable of spoofing Loran-C signals, still cannot make the device work since he does not know what location tag to spoof. We provide experimental data supporting our unpredictability claim.

    View details for DOI 10.3390/s101211369

    View details for Web of Science ID 000285708700050

    View details for PubMedID 22163532

  • RAIM with Optimal Integrity and Continuity Allocations Under Multiple Failures IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS Blanch, J., Walter, T., Enge, P. 2010; 46 (3): 1235-1247
  • Reversion from L1-L5 Dual to L5 Single Frequency WAAS in the Presence of RF Interference IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS Jan, S., Walter, T., Enge, P. 2010; 46 (3): 1110-1126
  • Ionospheric Threat Parameterization for Local Area Global-Positioning-System-Based Aircraft Landing Systems JOURNAL OF AIRCRAFT Datta-Barua, S., Lee, J., Pullen, S., Luo, M., Ene, A., Qiu, D., Zhang, G., Enge, P. 2010; 47 (4): 1141-1151

    View details for DOI 10.2514/1.46719

    View details for Web of Science ID 000280869500007

  • Enabling LAAS Airport Surface Movement: Mitigating the Anomalous Ionospheric Threat 2010 IEEE-ION POSITION LOCATION AND NAVIGATION SYMPOSIUM PLANS Park, Y. S., Pullen, S., Enge, P. 2010: 461-473
  • Secure Location Verification -- A Security Analysis of GPS Signal Authentication Becker, G., T., Lo, S., C., Lorenzo, D., S. De, Enge, P., K., Paar, C. 2010
  • Future Augmented Published in GPS World March 2010 Walter, T., Enge, P., Blanch, J. 2010
  • Authenticating Aviation Augmentation System Broadcasts Lo, S., Enge, P. 2010
  • Ionospheric Threat Parameterization for Local Area Global-Positioning-System-Based Aircraft Landing Systems Datta-Barua, S., Lee, J., Pullen, S., Luo, M., Ene, A., Qiu, D., Enge, P. K. 2010
  • Preliminary Assessment of Alternative Navigation Means for Civil Aviation Lo, S., Enge, P., Niles, F., Loh, R., Eldredge, L., Narins, M. 2010
  • Vertical Protection Level Equations for Dual Frequency SBAS Walter, T., Blanch, J., Enge, P. 2010
  • A Study of Severe Multipath Errors for the Proposed GBAS Airport Surface Movement Application Park, Y. S., Pullen, S., Enge, P. 2010
  • Alternative Positioning Navigation and Timing -- The Need for Robust Radionavigation Narins, M., Eldredge, L., Enge, P., Harrison, M., Kenagy, R., Lo, S. 2010
  • GPS Signal-in-Space Anomalies in the Last Decade: Data Mining of 400,000,000 GPS Navigation Messages Heng, L., Gao, Grace, X., Walter, T., Enge, P. 2010
  • The WAAS/L5 Signal for Robust Time Transfer: Adaptive Beamsteering Antennas for Satellite Time Synchronization Lorenzo, D. D., Lo, S., Seo, J., Chen, Y., Enge, P. 2010
  • Enabling LAAS Airport Surface Movement: Mitigating the Anomalous Ionospheric Threat Park, Y. S., Pullen, S., Enge, P. 2010
  • Carrier Phase Ionospheric Gradient Ground Monitor for GBAS with Experimental Validation Enge, P., Khanafseh, S., Yang, F., Pervan, B., Pullen, S., Warburton, J. 2010
  • Prototyping Advanced RAIM for Vertical Guidance Blanch, J., Choi, M., Walter, T., Enge, P., Suzuki, K. 2010
  • RAIM with Optimal Integrity and Continuity Allocations Under Multiple Failures Published in IEEE Transactions on Aerospace and Electronic Systems Blanch, J., Walter, T., Enge, P. 2010; 46 (3): 1235-47
  • GBAS Differentially Corrected Positioning Service Ionospheric Anomaly Errors Evaluated in an Operational Context Enge, P., Murphy, T., Harris, M., Park, Y. S., Pullen, S. 2010
  • Evaluation of Dual-Frequency GBAS Performance using Data from Public Receiver Networks Suzuki, K., Pullen, S., Enge, P., Ono, T. 2010
  • Using SBAS to Enhance GBAS User Availability: Results and Extensions to Enhance Air Traffic Management Pullen, S., Luo, M., Walter, T., Enge, P. 2010
  • Long Term Monitoring of Ionospheric Anomalies to Support the Local Area Augmentation System Lee, J., Jung, S., Bang, E., Pullen, S., Enge, P. 2010
  • Real-Time Software Receiver for GPS Controlled Reception Pattern Antenna Array Processing Chen, Y., Juang, J., Lorenzo, D. D., Seo, J., Lo, S., Enge, P. 2010
  • Aviation Grade: Chips off the Block IIF (Evaluating the IIF-1 for Aviation Users) Published by Inside GNSS Phelts, R., E., Gao, Grace, X., Wong, G., Heng, L., Walter, T., Enge, P. 2010
  • Characterization of Signal Deformations for GPS and WAAS Satellites Wong, G., Wong, G., Phelts, E., Walter, T., Enge, P. 2010
  • Alternative Positioning, Navigation, and Timing (PNT) Study Eldredge, L., Enge, P., Harrison, M., Kenagy, R., Lo, S., Loh, R. 2010
  • Ephemeris Type A Fault Analysis and Mitigation for LAAS Tang, H., Pullen, S., Enge, P., Grattton, L., Brenner, M., Scheitlin 2010
  • Space Weather: Its Effect on GNSS, DGNSS, SBAS, and Flight Inspection Enge, P., Powell, J., D., Walter, T. 2010
  • GPS in Mid-life with an International Team of Doctors: Analyzing IIF-1 Satellite Performance and Backward-Compatibility Gao, Grace, X., Heng, L., Wong, P., Eric, G., Blanch, J., Walter, T., Enge, P. K. 2010
  • Evaluation of Signal in Space Error Bounds to Support Aviation Integrity Published in NAVIGATION Walter, T., Blanch, J., Enge, P. 2010; 57 (2): 101-113
  • Unaugmented GPS-Based Flight Inspection System Published in IEEE Transactions on Aerospace and Electronics Systems Kim, E., Walter, T., Enge, P. 2010; 46 (2)
  • On the Air: New Signals from the First GPS IIF Satellite Published by Inside GNSS July/August 2010 Thoelert, S., Erker, S., Heng, L., Phelts, R., E., Gao, Grace, X., Wong, G., Enge, P. K. 2010
  • Authenticating Aviation Augmentation System Broadcasts 2010 IEEE-ION POSITION LOCATION AND NAVIGATION SYMPOSIUM PLANS Lo, S. C., Enge, P. K. 2010: 502-511
  • Coverage Improvement for Dual Frequency SBAS PROCEEDINGS OF THE 2010 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION - ITM 2010 Walter, T., Blanch, J., Enge, P. 2010: 344-353
  • Improving Loran Coverage with Low Power Transmitters JOURNAL OF NAVIGATION Lo, S. C., Peterson, B. B., Hardy, T., Enge, P. K. 2010; 63 (1): 23-38
  • Prototyping Advanced RAIM for Vertical Guidance PROCEEDINGS OF THE 23RD INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2010) Blanch, J., Choi, M. J., Walter, T., Enge, P. 2010: 285-291
  • GPS Ephemeris Error Screening and Results for 2006-2009 PROCEEDINGS OF THE 2010 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION - ITM 2010 Heng, L., Gao, G. X., Walter, T., Enge, P. 2010: 1014-1022
  • Vertical Protection Level Equations for Dual Frequency SBAS PROCEEDINGS OF THE 23RD INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2010) Walter, T., Blanch, J., Enge, P. 2010: 2031-2041
  • The WAAS/L5 Signal for Robust Time Transfer: Adaptive Beamsteering Antennas for Satellite Time Synchronization PROCEEDINGS OF THE 23RD INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2010) De Lorenzo, D. S., Lo, S. C., Seo, J., Chen, Y., Enge, P. K. 2010: 2106-2116
  • GPS Signal-in-Space Anomalies in the Last Decade Data Mining of 400,000,000 GPS Navigation Messages PROCEEDINGS OF THE 23RD INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2010) Heng, L., Gao, G. X., Walter, T., Enge, P. 2010: 3115-3122
  • Characterization of Signal Deformations for GPS and WAAS Satellites PROCEEDINGS OF THE 23RD INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2010) Wong, G., Phelts, R. E., Walter, T., Enge, P. 2010: 3143-3151
  • A Study of Severe Multipath Errors for the Proposed GBAS Airport Surface Movement Application PROCEEDINGS OF THE 23RD INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2010) Park, Y. S., Pullen, S., Enge, P. 2010: 2661-2671
  • Simple Loran Cycle Error Detection Algorithms for Maritime Harbor Entrance Approach Operations PROCEEDINGS OF THE 2010 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION - ITM 2010 Peterson, B. B., Lo, S. C., Enge, P. K. 2010: 472-479
  • Ephemeris Type A Fault Analysis and Mitigation for LAAS 2010 IEEE-ION POSITION LOCATION AND NAVIGATION SYMPOSIUM PLANS Tang, H., Pullen, S., Enge, P., Gratton, L., Pervan, B., Brenner, M., Scheitlin, J., Kline, P. 2010: 448-460
  • GPS in Mid-life with an International Team of Doctors Analyzing IIF-1 Satellite Performance and Backward-Compatibility PROCEEDINGS OF THE 23RD INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2010) Gao, G. X., Heng, L., Wong, G., Phelts, E., Blanch, J., Walter, T., Enge, P., Erker, S., Thoelert, S., Meurer, M. 2010: 1597-1604
  • Sigma Overbounding using a Position Domain Method for the Local Area Augmentaion of GPS IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS Lee, J., Pullen, S., Enge, P. 2009; 45 (4): 1262-1274
  • Impact and mitigation of ionospheric anomalies on ground-based augmentation of GNSS RADIO SCIENCE Pullen, S., Park, Y. S., Enge, P. 2009; 44
  • Compass-M1 Broadcast Codes in E2, E5b, and E6 Frequency Bands IEEE JOURNAL OF SELECTED TOPICS IN SIGNAL PROCESSING Gao, G. X., Chen, A., Lo, S., De Lorenzo, D., Walter, T., Enge, P. 2009; 3 (4): 599-612
  • Characteristics of deep GPS signal fading due to ionospheric scintillation for aviation receiver design RADIO SCIENCE Seo, J., Walter, T., Chiou, T., Enge, P. 2009; 44
  • Availability Benefit of Future Dual Frequency GPS Avionics under Strong Ionospheric Scintillation Seo, J., Walter, T., Enge, P. 2009
  • Providing Integrity for Satellite Navigation: Lessons Learned (Thus Far) from the Financial Collapse of 2008-2009 Enge, P., Pullen, S. 2009
  • Efficient authentication mechanisms for navigation systems — a radio-navigation case study Becker, G., Lo, S., Lorenzo, David, S. De, Qiu, D., Par, C., Enge, P. 2009
  • Pattern Classification for Geotag Generation Qiu, D., Lo, S., Lorenzo, David, S. De, Enge, P. 2009
  • MATLAB Algorithm Availability Simulation Tool Published by GPS Solutions Enge, Per, K., Jan, S., S., Chan, W., Walter, T. 2009; 13 (4)
  • Analysis and Modeling of Skywave Behavior Lo, S., Wenzel, R., Enge, P. 2009
  • Sensitivity of Code Tracking Methods to PRN Differences Enge, P., Phelts, R., Eric 2009
  • Hysteresis in RAIM Blanch, J., Mayer, C., Lo, S., Walter, T., Enge, P. 2009
  • Impact and mitigation of ionospheric anomalies on ground-based augmentation of GNSS Published in the AGU Electronic Journal Pullen, S., Park, Y. S., Enge, P. 2009; 44: RSOA21
  • Robust Location Tag Generation from Noisy Location Data for Security Applications Qiu, D., Boneh, D., Lo, S., Enge, P. 2009
  • Loran PF, SF, ASF for the Radio Technical Committee Maritime (RTCM) Lo, S., Peterson, B., Enge, P. 2009
  • Characterizing Nominal Analog Signal Deformation on GNSS Signals Phelts, R., Eric, Walter, T., Enge, P. 2009
  • Sigma Overbounding using a Position Domain Method for the Local Area Augmentation of GPS Lee, J., Pullen, S., Enge, P. 2009
  • Methodology and Case Studies of Signal-in-Space Error Calculation: Top-down Meets Bottom-up PRESENTATION (in PDF) Gao, Grace, X., Tang, H., Blanch, J., Lee, J., Lo, W., Walter, T., Enge, P. K. 2009
  • Signal Authentication: A Secure Civil GNSS for Today Published by Inside GNSS Lo, S., David, D. L., Enge, P., Akos, D., Bradley, P. 2009: 30-39
  • A Miniaturized Loran H-field Antenna for Handheld Devices De Lorenzo, D., S., Lo, S., C., Cohen, M., Chang, J., Inan, U., S., Enge, P. 2009
  • Evaluation of Signal in Space Error Bounds to Support Aviation Integrity Walter, T., Blanch, J., Enge, P. 2009
  • Characteristics of deep GPS signal fading due to ionospheric scintillation for aviation receiver design Published in the AGU Electronic Journal Seo, J., Walter, T., Chiou, T., Enge, P. 2009
  • Flight Test Data Validation of Dual-Frequency GPS Measurement Error Characteristics PRESENTATION (in PDF) Tang, H., Blanch, J., Walter, T., Enge, P. 2009
  • Enabling the LAAS Differentially Corrected Positioning Service (DCPS): Design and Requirements Alternatives Park, Y. S., Pullen, S., Enge, P. 2009
  • Assessing the Security of a Navigation System: A Case Study using Enhanced Loran PRESENTATION (in PDF) Lo, S., Peterson, B., Enge, P. 2009
  • Modernization Milestone: Observing the First GPS Satellite with an L5 Payload Published by Inside GNSS Magazine Gao, Grace, X., Heng, L., David, D. L., Lo, S., Akos, D., Chen, A., Enge, P. K. 2009; 3 (4): 60-64
  • Characterizing Nominal Analog Signal Deformation on GNSS Signals PROCEEDINGS OF THE 22ND INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2009) Phelts, R. E., Walter, T., Enge, P. 2009: 1343-1350
  • Physical Pseudo Random Function in Radio Frequency Sources for Security PROCEEDINGS OF THE 2009 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION - ITM 2009 Qiu, D., De Lorenzo, D., Lo, S., Boneh, D., Enge, P. 2009: 84-92
  • Methodology and Case Studies of Signal-in-Space Error Calculation Top-down Meets Bottom-up PROCEEDINGS OF THE 22ND INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2009) Gao, G. X., Tang, H., Blanch, J., Lee, J., Walter, T., Enge, P. 2009: 2824-2831
  • Pattern Classification for Geotag Generation PROCEEDINGS OF THE 22ND INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2009) Qiu, D., Lo, S., Enge, P., Boneh, D. 2009: 1819-1827
  • Design and Performance of a Minimum-Variance Hybrid Location Algorithm Utilizing GPS and Cellular Received Signal Strength for Positioning in Dense Urban Environments PROCEEDINGS OF THE 2009 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION - ITM 2009 De Lorenzo, D. S., Lo, S. C., Enge, P. K., Feuerstein, M., Bhattacharya, T. K., Spain, S., Kang, Z. 2009: 784-792
  • Evaluation of Signal in Space Error Bounds to Support Aviation Integrity PROCEEDINGS OF THE 22ND INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2009) Walter, T., Blanch, J., Enge, P. 2009: 1317-1329
  • Availability Benefit of Future Dual Frequency GPS Avionics under Strong Ionospheric Scintillation PROCEEDINGS OF THE 22ND INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2009) Seo, J., Walter, T., Enge, P. 2009: 1216-1224
  • Robust Location Tag Generation from Noisy Location Data for Security Applications PROCEEDINGS OF THE 2009 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION - ITM 2009 Qiu, D., Boneh, D., Lo, S., Enge, P. 2009: 586-597
  • Hysteresis in RAIM PROCEEDINGS OF THE 22ND INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2009) Blanch, J., Mayer, C., Lo, S., Walter, T., Enge, P. 2009: 2818-2823
  • Enabling the LAAS Differentially Corrected Positioning Service (DCPS): Design and Requirements Alternatives PROCEEDINGS OF THE 22ND INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2009) Park, Y. S., Pullen, S., Enge, P. 2009: 1149-1158
  • Worldwide Vertical Guidance of Aircraft Based on Modernized GPS and New Integrity Augmentations PROCEEDINGS OF THE IEEE Walter, T., Enge, P., Blanch, J., Pervan, B. 2008; 96 (12): 1918-1935
  • Special Issue on Aviation Information Systems PREFACE PROCEEDINGS OF THE IEEE Rife, J., Tomlin, C., Enge, P. 2008; 96 (12): 1898-1901
  • Bounding higher-order ionosphere errors for the dual-frequency GPS user RADIO SCIENCE Datta-Barua, S., Walter, T., Blanch, J., Enge, P. 2008; 43 (5)
  • Altitudinal variation of midlatitude localized TEC enhancement from ground- and space-based measurements SPACE WEATHER-THE INTERNATIONAL JOURNAL OF RESEARCH AND APPLICATIONS Datta-Barua, S., Mannucci, A. J., Walter, T., Enge, P. 2008; 6 (10)
  • Position Error Bound Calculation for GNSS using Measurement Residuals IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS Blanch, J., Walter, T., Enge, P. 2008; 44 (3): 977-984
  • Targeted Ephemeris Decorrelation Parameter Inflation for Improved LAAS Availability During Severe Ionosphere Anomalies PROCEEDINGS OF THE 2008 NATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION - NTM 2008 Ramakrishnan, S., Lee, J., Pullen, S., Enge, P. 2008: 354-366
  • Design and Analysis of Reconfigurable Embedded GNSS Receivers Using Model-Based Design Tools Ramakrishnan, S., Gao, G. X., Lorenzo, D. D., Walter, T., Enge, P., Akos, D. 2008
  • GNSS-based Flight Inspection Systems Enge, P., Kim, E., Walter, T., Powell, J., David 2008
  • Worldwide Vertical Guidance of Aircraft Based on Modernized GPS and New Integrity Augmentations Walter, T., Enge, P., Blanch, J., Pervan, B. 2008
  • Characteristics of Deep GPS Signal Fading Due to Ionospheric Scintillation for Aviation Receiver Design Seo, J., Walter, T., Chiou, T., Enge, P. 2008
  • Position error bound calculation for GNSS using measurement residuals Published in IEEE Transactions on Aerospace and Electronic Systems Blanch, J., Walter, T., Enge, P. 2008; 44 (3)
  • Evaluation of Deep Signal Fading Effects Due to Ionospheric Scintillation on GPS Aviation Receivers Seo, J., Walter, T., Chiou, T., Blanch, J., Enge, P. 2008
  • Failure Detection and Exclusion via Range Consensus Schroth, G., Ene, A., Blanch, J., Walter, T., Enge, P. 2008
  • Validation of Multiple Hypothesis RAIM Algorithm using Dual-frequency GNSS Signals Enge, P., Ene, A., Blanch, J., Walter, T., Powell, J., D. 2008
  • Performance of a Doppler-Aided GPS Navigation System for Aviation Applications under Ionospheric Scintillation Chiou, T., Seo, J., Walter, T., Enge, P. 2008
  • Satellite Navigation Integrity Assurance: Lessons Learned from Hurricane Katrina Enge, P., Pullen, S. 2008
  • The Impact and Mitigation of Ionosphere Anomalies on Ground-Based Augmentation of GNSS Pullen, S., Park, Y. S., Enge, P. 2008
  • Mitigation of Anomalous Ionosphere Threat to Enhance Utility of LAAS Differentially Corrected Positioning Service (DCPS) Park, Y. S., Pullen, S., Enge, P. 2008
  • Integrating Loran and GNSS for Safety of Life Applications Peterson, B., Lo, S., Enge, P. 2008
  • Using Loran for Broadcast of Integrity Information for Modernized Global Navigation Satellite Systems (GNSS) Lo, S., Peterson, B., Enge, P. 2008
  • Test Results for the WAAS Signal Quality Monitor Enge, P., Hsu, P., Chiu, T., Golubev, Y., Phelts, R., E. 2008
  • Improving GPS-Based Landing System Performance using an Empirical Barometric Altimeter Confidence Bound Published by IEEE Transactions on Aerospace and Electronic Systems Jan, S., S., Gebre-Egziabher, D., Walter, T., Enge, P. 2008; 44 (1)
  • GIOVE-B on the Air: Understanding Galileo's New Signals Published by Inside GNSS May/June2008 Gao, G., X., Akos, D., Walter, T., Enge, P. 2008
  • Enhancements of the Range Consensus Algorithm (RANCO) Schroth, G., Rippl, M., Ene, A., Blanch, J., Belabbas, B., Walter, T., Enge, P. K. 2008
  • A Measure of Loran Location-based Parameters Qiu, D., Lo, S., Enge, Per. 2008
  • Mitigation of Continuous and Pulsed Radio Interference with GNSS Antenna Arrays Konovaltsev, A., Lorenzo, David, S. De, Hornbostel, A., Enge, P. 2008
  • Altitudinal variation of midlatitude localized TEC enhancement from ground- and space-based measurements Published in Space Weather Datta-Barua, S., Mannucci, A., J., Walter, T., Enge, P. 2008; 6: S10D06
  • Loran Coverage Availability Simulation Tool* Lo, S., Peterson, B., Boyce, C., O.Lee, Enge, P. 2008
  • Loran Coverage Availability Simulation Tool Lo, S., Peterson, B., Boyce, C., O. Lee, Enge, P. 2008
  • Formulation of a Time-Varying Maximum Allowable Error for Ground-Based Augmentation Systems Published by IEEE Transactions on Aerospace and Electronic Systems Enge, Per, K., Rife, J., Phelts, R., E. 2008; 44 (2)
  • Bounding higher-order ionosphere errors for the dual-frequency GPS user Published in Radio Science Datta-Barua, S., Walter, T., Blanch, J., Enge, P. 2008; 43: RS5010
  • Navigation, Interference Suppression, and Fault Monitoring in the Sea-Based Joint Precision Approach and Landing System Enge, Per, K., Rife, J., Pullen, S., Lorenzo, D., S. De, Kim, U-S., Koenig, M. 2008
  • Temporal Variation of Loran ASFs and their Effects on HEA Navigation Enge, P., Johnson, Gregory, W., Swaszek, Peter, F., Hartnett, Richard, J., Dykstra, K., Shalaev, R. 2008
  • A Simple Algorithm for Dual Frequency Ground Monitoring Compatible with ARAIM Blanch, J., Walter, T., Enge, P. 2008
  • Mitigation of anomalous ionosphere threat to enhance utility of LAAS differentially corrected positioning service (DCPS) 2008 IEEE/ION POSITION, LOCATION AND NAVIGATION SYMPOSIUM, VOLS 1-3 Park, Y. S., Pullen, S., Enge, P. 2008: 432-440
  • Understanding the GIOVE-B Broadcast Codes of the Galileo System 2008 42ND ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS AND COMPUTERS, VOLS 1-4 Gao, G. X., Akos, D., Walter, T., Enge, P. 2008: 2086-2090
  • Improving GPS-based landing system performance using an empirical barometric altimeter confidence bound IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS Jan, S., Gebre-Egziabher, D., Walter, T., Enge, P. 2008; 44 (1): 127-146
  • Future Architectures to Provide Aviation Integrity PROCEEDINGS OF THE 2008 NATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION - NTM 2008 Walter, T., Blanch, J., Enge, P., Pervan, B., Gratton, L. 2008: 394-401
  • A measure of Loran location-based information 2008 IEEE/ION POSITION, LOCATION AND NAVIGATION SYMPOSIUM, VOLS 1-3 Qiu, D., Lo, S., Enge, P. 2008: 1227-1234
  • Compass-M1 Broadcast Codes and Their Application to Acquisition and Tracking PROCEEDINGS OF THE 2008 NATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION - NTM 2008 Gao, G. X., Chen, A., Lo, S., De Lorenzo, D., Walter, T., Enge, P. 2008: 133-141
  • Assessment of the Methodology for Bounding Loran Temporal ASF for Aviation PROCEEDINGS OF THE 2008 NATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION - NTM 2008 Lo, S. C., Wenzel, R., Johnson, G., Enge, P. K. 2008: 432-442
  • Loran data modulation: A primer IEEE AEROSPACE AND ELECTRONIC SYSTEMS MAGAZINE Lo, S. C., Peterson, B. B., Enge, P. K. 2007; 22 (9): 31-51
  • Assessment of ionosphere spatial decorrelation for global positioning system-based aircraft landing systems JOURNAL OF AIRCRAFT Lee, J., Pullen, S., Datta-Barua, S., Enge, P. 2007; 44 (5): 1662-1669

    View details for DOI 10.2514/1.28199

    View details for Web of Science ID 000250363300024

  • Robustness of TOA and TDOA positioning under suboptimal weighting conditions IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS Do, J., Rabinowitz, M., Enge, P. 2007; 43 (3): 1177-1180
  • Loran data modulation: Extensions and examples IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS Lo, S. C., Peterson, B. B., Enge, P. K., Swaszek, P. 2007; 43 (2): 628-644
  • Understanding PHMI for Safety of Life Applications in GNSS PROCEEDINGS OF THE 2007 NATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION - NTM 2007 Blanch, J., Walter, T., Enge, P. 2007: 305-310
  • Ionospheric Scintillation Effects on GPS Receivers during Solar Minimum and Maximum Seo, J., Walter, T., Marks, E., Chiou, T., Enge, P. 2007
  • Testing of Adaptive Beamsteering for Interference Rejection in GNSS Receivers Lorenzo, D., S. De, Antreich, F., Denks, H., Hornbostel, A., Weber, C., Enge, P. 2007
  • Using Seasonal Monitor Data to Assess Aviation Integrity Lo, S., Johnson, G., Swaszek, P., Wenzel, R., Morris, P., Enge, P. 2007
  • Security Analysis of Geoencryption: A Case Study Using Loran Enge, P., Qiu, D. 2007
  • Range Biases on Modernized GNSS Codes Enge, P., Phelts, R., Eric 2007
  • Dual-Frequency Smoothing for CAT III LAAS: Performance Assessment Considering Ionosphere Anomalies Enge, P., Konno, H. 2007
  • Proving the Integrity of the Weighted Sum Squared Error (WSSE) Loran Cycle Confidence Algorithm Published by Navigation: The Journal of the Institute of Navigation Lo, S., Peterson, B., Enge, P. 2007; 54 (4)
  • Loran Data Modulation: Extensions and Examples Published by IEEE Transactions on Aerospace Electronic Systems Lo, S., Peterson, B., Swaszek, P., Enge, P. 2007
  • On the Probability Density Function and Stability Properties for a Cross-Product Frequency-Locked Loop Enge, P., Chiou, T. 2007
  • Loran Data Modulation: A Primer Published by IEEE Aerospace and Electronic Systems Magazine Lo, S., Peterson, B., Enge, P. 2007
  • GNSS over China: The Compass MEO Satellite Codes Published by Inside GNSS July/August 2007 Gao, G., X., Chen, A. 2007: 36-43
  • Robustness of TOA and TDOA Positioning Under Suboptimal Weighting Conditions Published by IEEE Transactions on Aerospace Electronic Systems 2007 Do, J., Rabinowitz, M., Enge, P. 2007
  • Data-Replay Analysis of LAAS Safety during Ionosphere Storms Park, Y. S., Zhang, G., Pullen, S., Lee, J., Enge, P. 2007
  • Security for Insecure Times: Geoencryption with Loran Published by GPS World November 2007 Lo, S., Enge, P. 2007
  • Ionosphere Effects for Wideband GNSS Signals Gao, G. X., Datta-Barua, S., Walter, T., Enge, P. 2007
  • L5 Satellite Based Augmentation Systems Protection Level Equations Walter, T., Blanch, J., Enge, P. 2007
  • DME/TACAN Interference and its Mitigation in L5/E5 Bands Enge, P., Gao, G. X. 2007
  • Multiple Hypothesis RAIM with Real-Time FDE and Forecasted Availability for Combined Galileo-GPS Vertical Guidance Enge, P., Ene, A. 2007
  • An Optimized Multiple Hypothesis RAIM Algorithm for Vertical Guidance Blanch, J., Ene, A., Walter, T., Enge, P. 2007
  • Low-Elevation Ionosphere Spatial Anomalies Discovered from the 20 November 2003 Storm Zhang, G., Lee, J., Datta-Barua, S., Pullen, S., Enge, P. 2007
  • Modeling the 20 November 2003 Ionosphere Storm with GRACE Datta-Barua, S., Walter, T., Pullen, S., Enge, P. 2007
  • WAAS-Based Flight Inspection System Enge, P., Kim, E., Walter, T., Powell, J., D. 2007
  • Fault Detection and Elimination for Galileo-GPS Vertical Guidance Enge, P., Ene, A., Blanch, J., Powell, J., David 2007
  • Adaptive Carrier Smoothing using Code and Carrier Divergence Enge, P., Kim, E., Walter, T., Powell, J., D. 2007
  • Worldwide Trends in GNSS Development and their Implications for Civil User Performance and Safety Enge, P., Pullen, S. 2007
  • Acquisition and Tracking of GIOVE-A Broadcast L1/E5/E6 Signals and Analysis of DME/TACAN Interference on Receiver Design Gao, G. X., Lorenzo, David, S. De, Walter, T., Enge, P. 2007
  • An Investigation into the Temporal Correlation at the ASF Monitor Sites Enge, P., Swaszek, P., Johnson, G., Hartnett, R., Lo, S. 2007
  • Portable GPS Baseband Logging Enge, P., Quigley, M., Abbeel, P., Lorenzo, D., S. De, Gu, Y., Bolouki, S. 2007
  • Standalone GPS-Based Flight Inspection System Enge, P., Kim, E., Walter, T., Powell, J., D. 2007
  • Model Analysis on the Performance for an Inertial Aided FLL-Assisted-PLL Carrier-Tracking Loop in the Presence of Ionospheric Scintillation PROCEEDINGS OF THE 2007 NATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION - NTM 2007 Chiou, T., Gebre-Egziabher, D., Walter, T., Enge, P. 2007: 1276-1295
  • Geoencryption Using Loran PROCEEDINGS OF THE 2007 NATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION - NTM 2007 Qiu, D., Lo, S., Enge, P., Boneh, D., Peterson, B. 2007: 104-115
  • Proving the Integrity of the Weighted Sum Squared Error (WSSE) Loran Cycle Confidence Algorithm PROCEEDINGS OF THE 2007 NATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION - NTM 2007 Lo, S. C., Peterson, B. B., Enge, P. K. 2007: 187-200
  • Galileo GIOVE-A Broadcast E5 Codes and their Application to Acquisition and Tracking PROCEEDINGS OF THE 2007 NATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION - NTM 2007 Gao, G. X., De Lorenzo, D. S., Chen, A., Lo, S. C., Akos, D. M., Walter, T., Enge, P. 2007: 936-946
  • Multi-Fault Tolerant RAIM Algorithm for Hybrid GPS/TV Positioning PROCEEDINGS OF THE 2007 NATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION - NTM 2007 Do, J., Rabinowitz, M., Enge, P. 2007: 788-797
  • Paired overbounding for nonideal LAAS and WAAS error distributions IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS Rife, J., Pullen, S., Enge, P., Pervan, B. 2006; 42 (4): 1386-1395
  • Detecting RFI through integrity monitoring at a DGPS reference station JOURNAL OF NAVIGATION Yun, Y., Kee, C., Rife, J., Luo, M., Pullen, S., Enge, P. 2006; 59 (3): 403-422
  • Monitoring global positioning system satellite orbit errors for aircraft landing systems JOURNAL OF AIRCRAFT Lee, J., Pullen, S., Enge, P., Pervan, B., Gratton, L. 2006; 43 (3): 799-808
  • Sigma-mean monitoring for the local area augmentation of GPS IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS Lee, J., Pullen, S., Enge, P. 2006; 42 (2): 625-635
  • Evaluation of Two Types of Dual-Frequency Differential GPS Techniques Under Anomalous Ionosphere Conditions PROCEEDINGS OF THE 2006 NATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION - NTM 2006 Konno, H., Pullen, S., Rife, J., Enge, P. 2006: 735-747
  • Analysis of Noise and Cycle Selection in a Loran Receiver Boyce, C., O.L., Lo, S., Powell, J., D., Enge, P. 2006
  • Position-Domain Geometry Screening to Maximize LAAS Availability in the Presence of Ionosphere Anomalies Lee, J., Luo, M., Pullen, S., Park, Y., S., Enge, P., Brenner, M. 2006
  • Performance of TOA and TDOA in a Non-homogeneous Transmitter Network Combining GPS and Terrestrial Signals Do, J., Rabinowitz, M., Enge, P. 2006
  • Flight Inspection of GNSS SBAS Procedures Enge, P., Walter, T., Powell, J., D. 2006
  • WAAS-Based Threat Monitoring for a Local Airport Monitor (LAM) that Supports Category I Precision Approach Rife, J., Pullen, S., Walter, T., Phelts, E., Pervan, B., Enge, P. 2006
  • Further Development of Galileo-GPS RAIM for Vertical Guidance Enge, P., Ene, A. 2006
  • Navigation Accuracy and Interference Rejection for an Adaptive GPS Antenna Array ]  [ PRESENTATION (in PDF) Lorenzo, D. D., Rife, J., Enge, P., Akos, D. 2006
  • Galileo-GPS RAIM for Vertical Guidance Enge, P., Ene, A., Blanch, J., Walter, T. 2006
  • Assessment of Nominal Ionosphere Spatial Decorrelation for LAAS Lee, J., Pullen, S., Datta-Barua, S., Enge, P. 2006
  • Evaluation of Two Types of Dual-Frequency Differential GPS Techniques under Anomalous Ionosphere Conditions Konno, H., Pullen, S., Rife, J., Enge, P. 2006
  • Ionosphere Monitoring Methodology for Hybrid Dual-Frequency LAAS Konno, H., Pullen, S., Rife, J., Enge, P. 2006
  • WAAS-Aided Flight Inspection Truth System Enge, P., Kim, E., Walter, T., Powell, J., D. 2006
  • Assessing the Loran Cycle Confidence Algorithm Lo, S., Peterson, B., Enge, P. 2006
  • A Reference Point-based Precise Relative Positioning Method Using a Single Frequency Receiver Enge, P., Kim, E., Walter, T., Powell, J., D. 2006
  • Optimizing WAAS Accuracy/Stability For a Single Frequency Receiver Enge, P., Kim, E., Walter, T., Powell, J., D. 2006
  • A Development of WAAS-Aided Flight Inspection Truth System Enge, P., Kim, E., Peled, U., Walter, T., Powell, J., D. 2006
  • Code Generation Scheme and Property Analysis of Broadcast Galileo L1 and E6 Signals Gao, G., Spilker, J., Walter, T., Enge, P., Pratt, A. 2006
  • Effects of Signal Deformations on Modernized GNSS Signals Journal of Global Positioning Systems Enge, P., Phelts, R., Eric, Akos, D. 2006; 5 (1-2)
  • Formulation of a Time-Varying Maximum Allowable Error for Ground-Based Augmentation Systems Enge, P., Rife, J., Phelts, R., E.Akos 2006
  • Performance of Hybrid Positioning System Combining GPS and Television Signals Do, J., Rabinowitz, M., Enge, P. 2006
  • Preliminary Assessment of Loran for Required Navigation Performance 1.0 Lo, S., Enge, P. 2006
  • Prior Probability Model Development to Support System Safety Verification in the Presence of Anomalies Pullen, S., Rife, J., Enge, P. 2006
  • Bounding Higher Order Ionosphere Errors for the Dual Frequency GPS User Datta-Barua, S., Walter, T., Blanch, J., Enge, P. 2006
  • Mitigating Atmospheric Noise for Loran Boyce, C., O. L., Lo, S., Powell, J., D., Enge, P. 2006
  • Ionosphere Monitoring Methodology for Hybrid Dual-Frequency LAAS PROCEEDINGS OF THE 19TH INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2006) Konno, H., Pullen, S., Rife, J., Enge, P. 2006: 409-424
  • Code Generation Scheme and Property Analysis of Broadcast Galileo L1 and E6 Signals PROCEEDINGS OF THE 19TH INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2006) Gao, G. X., Spilker, J., Walter, T., Enge, P., Pratt, A. R. 2006: 1526-1534
  • Bounding Higher Order Ionosphere Errors for the Dual Frequency GPS User PROCEEDINGS OF THE 19TH INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2006) Datta-Barua, S., Walter, T., Blanch, J., Enge, P. 2006: 1377-1392
  • Performance of TOA and TDOA in a Non-homogeneous Transmitter Network Combining GPS and Terrestrial Signals PROCEEDINGS OF THE 2006 NATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION - NTM 2006 Do, J., Rabinowitz, M., Enge, P. 2006: 642-649
  • Prior probability model development to support system safety verification in the presence of anomalies 2006 IEEE/ION POSITION, LOCATION AND NAVIGATION SYMPOSIUM, VOLS 1-3 Pullen, S., Rife, J., Enge, P. 2006: 1127-1136
  • Position-Domain Geometry Screening to Maximize LAAS Availability in the Presence of Ionosphere Anomalies PROCEEDINGS OF THE 19TH INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2006) Lee, J., Luo, M., Pullen, S., Park, Y. S., Enge, P., Brenner, M. 2006: 393-408
  • Performance of hybrid positioning system combining GPS and television signals 2006 IEEE/ION POSITION, LOCATION AND NAVIGATION SYMPOSIUM, VOLS 1-3 Do, J., Rabinowitz, M., Enge, P. 2006: 556-564
  • WAAS-based threat monitoring for a Local Airport Monitor (LAM) that supports Category I Precision Approach 2006 IEEE/ION POSITION, LOCATION AND NAVIGATION SYMPOSIUM, VOLS 1-3 Rife, J., Pullen, S., Walter, T., Phelts, E., Pervan, B., Enge, P. 2006: 468-482
  • Mitigating Atmospheric Noise for Loran PROCEEDINGS OF THE 19TH INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2006) Boyce, C. O., Lo, S. C., Powell, J. D., Enge, P. K. 2006: 77-82
  • Navigation Accuracy and Interference Rejection for an Adaptive GPS Antenna Array PROCEEDINGS OF THE 19TH INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2006) De Lorenzo, D. S., Rife, J., Enge, P., Akos, D. M. 2006: 763-773
  • Assessment of nominal ionosphere spatial decorrelation for LAAS 2006 IEEE/ION POSITION, LOCATION AND NAVIGATION SYMPOSIUM, VOLS 1-3 Lee, J., Pullen, S., Datta-Barua, S., Enge, P. 2006: 506-514
  • Field Data Analysis for a Range-Based Local Airport Monitor for WAAS PROCEEDINGS OF THE 2006 NATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION - NTM 2006 Seo, J., Rife, J., Pullen, S., Walter, T., Enge, P. 2006: 748-758
  • GPS Receiver Performance Using Inertial-Aided Carrier Tracking Loop Enge, P., Chiou, T. 2005
  • Verification of Low Latitude Ionosphere Effects on WAAS during October 2003 Geomagnetic Storm Datta-Barua, S., Walter, T., Konno, H., Blanch, J., Enge, P. 2005
  • The Impact of Measurement Biases on Availability for CAT III LAAS Enge, P., Rife, J., Pullen, S. 2005
  • The Advantages of Local Monitoring and VHF Data Broadcast for SBAS Walter, T., Pullen, S., Rife, J., Seo, J., Enge, P. 2005
  • Analysis of Ionosphere Gradient Using Japan GEONET Data Konno, H., Pullen, S., Luo, M., Enge, P. 2005
  • Vertical Protectiion Levels for a Local Airport Monitor for WAAS Rife, J., Pullen, S., Walter, T., Enge, P. 2005
  • LAAS Study of Slow-Moving Ionosphere Anomalies and Their Potential Impacts PRESENTATION (in PowerPoint) Luo, M., Pullen, S., Datta-Barua, S., Zhang, G., Walter, T., Enge, P. 2005
  • Analysis of Carrier Phase and Group Delay Biases Introduced by CRPA Hardware Enge, P., Kim, U. S. 2005
  • Noise Assessment and Mitigation for Loran for Aviation Boyce, L., Lo, S., Powell, J., D., Enge, P. 2005
  • Early Skywave Detection Network: Preliminary Design and Analysis Lo, S., Morris, P., Enge, P. 2005
  • A Comprehensive Ionosphere Storm Data Analysis Method to Support LAAS Threat Model Development Ene, A., Qiu, D., Luo, M., Pullen, S., Enge, P. 2005
  • Can WAAS Availability Be Inferred From Geomagnetic Data? An Analysis Datta-Barua, S., Walter, T., Blanch, J., Enge, P. 2005
  • Protection Level Calculation Using Measurement Residuals: Theory and Results Blanch, J., Walter, T., Enge, P. 2005
  • Linear Time-of-Arrival Estimation in a Multipath Environment by Inverse Correlation Method Do, J., Rabinowitz, M., Enge, P. 2005
  • Adaptive Array Processing for GPS Interference Rejection Lorenzo, D. D., Gautier, J., Rife, J., Enge, P., Akos, D. 2005
  • Protection Level Calculation in the Presence of Heavy Tail Errors Using Measurement Residuals Blanch, J., Walter, T., Enge, P. 2005
  • Noise Assessment and Mitigation for Loran for Aviation Boyce, L., Lo, S., Powell, J., D., Enge, P. 2005
  • Error Bound Optimization using Second Order Cone Programming Blanch, J., Walter, T., Enge, P. 2005
  • Use of ADS-B and Perspective Displays to Enhance Airport Capacity Enge, P., Powell, J., David, Jennings, C., Holforty, W. 2005
  • Optimizing Channel Selection for the JPALS' Land-based Integrity Monitor Koenig, M., Rife, J., Pullen, S., Enge, P. 2005
  • Retooling the global positioning system SCIENTIFIC AMERICAN Enge, P. 2004; 290 (5): 90-97

    View details for Web of Science ID 000220920600032

    View details for PubMedID 15127667

  • Precise phase calibration of a controlled reception pattern GPS antenna for JPALS PLANS 2004: POSITION LOCATION AND NAVIGATION SYMPOSIUM Kim, U. S., De Lorenzo, D. S., Akos, D., Gautier, J., Enge, P. 2004: 478-485
  • A Civil User Perspective on Near-Term and Long-Term GPS Modernization Pullen, S., Enge, P. 2004
  • Phase Effects Analysis of Patch Antenna CRPAs for JPALS Kim, U., S., De Lorenzo, D., S., Gautier, J., Enge, P., Orr, J., A. 2004
  • GPS Attitude Determination for a JPALS Testbed: Integer Initialization and Testing De Lorenzo, David S., Alban, S., Gautier, J., Enge, P., Akos, D. 2004
  • Core Overbounding and its Implications for LAAS Integrity Enge, K., Per, Jason, R., Pullen, S., Pervan, B. 2004
  • Paired Overbounding and Application to GPS Augmentation Jason, R., Pullen, S., Pervan, B., Enge, P. 2004
  • Loran Availability and Continuity Analysis for Required Navigation Performance 0.3 Enge, P., Sherman, L., et., al. 2004
  • Ionospheric Threats to Space-Based Augmentation System Development Enge, P., Datta-Barua, S. 2004
  • Correlation Structure of the Equatorial Ionosphere Enge, Per, K., Rajagopal, S. 2004
  • Ionosphere Spatial Gradient Threat for LAAS: Mitigation and Tolerable Threat Space Luo, M., Pullen, S., Walter, T., Enge, P. 2004
  • LAAS Position Domain Monitor Analysis and Test Results for CAT II/III Operations Enge, P., Lee, J. 2004
  • L and S Bands Spectrum Survey in the San Francisco Bay Area Juyong, D., Akos, D., Enge, P. 2004
  • Modernizing WAAS Walter, T., Enge, P., Reddan, P. 2004
  • Protecting Against Unsampled Ionospheric Threats Enge, K., Per, Walter, T., Rajagopal, S., Datta-Barua, S., Blanch, J. 2004
  • Nominal Signal Deformations: Limits on GPS Range Accuracy Enge, K., Per, Phelts, R., E., Akos, D., M. 2004
  • Precise Phase Calibration of a Controlled Reception Pattern GPS Antenna for JPALS Kim, U., Lorenzo, David S., De, Jennifer, G., Enge, P., Dennis, A., John, O. 2004
  • Ionospheric Estimation using Extended Kriging for a low latitude SBAS Blanch, J., Walter, T., Enge, P. 2004
  • Performance Analysis and Experimental Validation of a Doppler-Aided GPS/INS Receiver for JPALS Applications Chiou, T., Alban, S., Atwater, S., Gautier, J., Pullen, S., Enge, P. 2004
  • A New Ionospheric Estimation Algorithm for SBAS Combining Kriging and Tomography Enge, P., Blanch, J. 2004
  • Overbounding SBAS and GBAS Error Distributions with Excess-Mass Functions Enge, K., Per, Jason, R., Walter, T., Blanch, J. 2004
  • Differential Loran-C Enge, P., Carroll, Kevin M., Hawes, A., Peterson, B., Dykstra, K., Dykstra, K. 2004
  • Treatment of Biased Error Distributions in SBAS Enge, K., Per, Walter, T., Blanch, J., Rife, J. 2004
  • Ionosphere Threat to LAAS: Updated Model, User Impact, and Mitigations Luo, M., Pullen, S., Pullen, S., Alexander, E., Qiu, D., Walter, T., Enge, P. K. 2004
  • Loran Integrity Analysis for Required Navigation Performance 0.3 Enge, P., Sherman, L., et., al. 2004
  • GPS Receiver Architecture Effects on Controlled Reception Pattern Antennas for JPALS De Lorenzo, David S., Gautier, J., Enge, P., Akos, D. 2004
  • Overview of the Safety Analysis of Loran for Aviation Enge, P., Lo, S. 2004
  • The Effects of Large Ionospheric Gradients on Single Frequency Airborne Smoothing Filters for WAAS and LAAS Walter, T., Datta-Barua, S., Blanch, J., Enge, P. 2004
  • GPS attitude determination for a PALS testbed: Integer initialization and testing PLANS 2004: POSITION LOCATION AND NAVIGATION SYMPOSIUM De Lorenzo, D. S., Alban, S., Gautier, J., Enge, P. 2004: 762-770
  • L and S bands spectrum survey in the San Francisco bay area PLANS 2004: POSITION LOCATION AND NAVIGATION SYMPOSIUM Do, J., Akos, D. M., ENGE, P. K. 2004: 566-572
  • Paired overbounding and application to GPS augmentation PLANS 2004: POSITION LOCATION AND NAVIGATION SYMPOSIUM Rife, J., Pullen, S., Pervan, B., Enge, P. 2004: 439-446
  • Loran for RNP 0.3 Approach: The Preliminary Conclusions of Loran Integrity Performance Panel (LORIPP) Enge, Per, K., Lo, S. 2003
  • Loran Fault Trees for Required Navigation Performance 0.3 Enge, Per, K., Lo, S. 2003
  • Loran for Required Navigation Performance 0.3: The Current Work of the Loran Integrity Performance Panel (LORIPP) Enge, K., Per, Lo, S., et., al. 2003
  • A Time Domain Atmospheric Noise Level Analysis Enge, Per, K., Boyce, L. 2003
  • A Prototyping Platform for Multi-Frequency GNSS Receivers Enge, Per, K., Akos, D. 2003
  • Integrity Lessons from the WAAS Integrity Performance Panel (WIPP) Walter, T., Enge, P., DeCleene, B. 2003
  • Techniques for Graceful Reversion from Dual to Single Frequency WAAS Jan, S., Walter, T., Enge, P. 2003
  • Toward Real-Time SQM for WAAS: Improved Detection Techniques Phelts, R., Eric, Walter, T., Enge, P. 2003
  • Radio Frequency Interference Validation Testing for LAAS using the Stanford Integrity Monitor Testbed Luo, M., Xie, G., Akos, D., Pullen, S., Enge, P. 2003
  • Measurement Noise versus Process Noise in Ionosphere Estimation for WAAS Blanch, J., Walter, T., Enge, P. 2003
  • LAAS Ionosphere Spatial Gradient Threat Model and Impact of LGF and Airborne Monitoring Enge, Per, K., Luo, M. 2003
  • GPS Modernization: Capabilities of the New Civil Signals Enge, P. 2003
  • Analysis of the Effects of ASF Variations for Loran RNP 0.3 Enge, Per, K., Lo, S. 2003
  • Adapting Kriging to the WAAS MOPS Ionospheric Grid Blanch, J., Walter, T., Enge, P. 2003
  • Practical Signal Quality Monitoring for Augmentation Systems Enge, K., Per, Phelts, R., Eric, al., et. 2003
  • Performance Analysis and Architectures for INS-Aided GPS Tracking Loops Enge, Per, K., Alban, S., Akos, D., Rock, S., Gebre-Egziabher, D. 2003
  • Ionospheric Scintillation Effects on Single and Dual Frequency GPS Positioning Enge, Per, K., Datta-Barua, S., Doherty, P., Delay, S., Dehel, T., Klobuchar, J. 2003
  • WAAS performance in the 2001 Alaska flight trials of the high speed Loran data channel 2002 IEEE POSITION LOCATION AND NAVIGATION SYMPOSIUM Lo, S. C., Akos, D., Houck, S., Normark, P. L., Enge, P. 2002: 328-335
  • Leapfrog Navigation System Enge, Per, K., Opshaug, G. 2002
  • An Inexpensive and Robust GPS/INS Attitude System for Automobiles Enge, Per, K., Alban, S. 2002
  • Integrated GPS and UWB Navigation System Opshaug, G., Enge, P. 2002
  • The Loran Integrity Performance Panel Enge, Per, K., Lo, Sherman, et. al. 2002
  • An Ionospheric Estimation Algorithm for WAAS Based on Kriging Enge, Per, K., Blanch, J. 2002
  • A Simple Method of Signal Quality Monitoring for WAAS LNAV/VNAV Schloss, P., Phelts, R., Eric, Walter, T., Enge, P. 2002
  • Hazardously Misleading Information Analysis for Loran LNAV Peterson, B., Enge, P., Walter, T., Lo, S. B., Lee, O., C., Wenzel, R. 2002
  • Flight Demonstration of 3D Perspective Synthetic Vision and ADS-B for Closely Spaced Parallel Approaches Enge, K., Per, Jennings, C., Charafeddine, M., Powell, D., J., Taamallah, S. 2002
  • Using WAAS Ionospheric Data to Estimate LAAS Short Baseline Gradients Datta-Barua, S., Walter, T., Pullen, S., Luo, M., Blanch, J., Enge, P. 2002
  • Sensitivity Analysis of the JPALS Shipboard Relative GPS Measurement Quality Monitor Koenig, M., Gebre-Egziabher, D., Pullen, S., Kim, U., S., Enge, P., Pervan, B., S. 2002
  • Application of Spatial Statistics to Ionosphere Estimation for WAAS Blanch, J., Walter, T., Enge, P. 2002
  • The Loran Integrity Performance Panel (LORIPP) Enge, Per, K., Lo, Sherman, et. al. 2002
  • Analysis of a Three-Frequency GPS/WAAS Receiver to Land an Airplane Enge, Per, K., Jan, S., S. 2002
  • System Overview, Recent Developments, and Future Outlook for WAAS and LAAS Pullen, S., Walter, T., Enge, P. 2002
  • Flight Test Measurement of Pilot Reaction Times to Runway Incursions: Out-the-Window vs. Synthetic Vision Enge, K., Per, Jennings, C., Powell, D., J. 2002
  • The Integrity Monitor Testbed and Multipath Limiting Antenna Test Results Normark, P., Akos, D., Xie, G., Pullen, S., Luo, M., Enge, P. 2002
  • Assessment of Ionospheric Impact on LAAS Using WAAS Supertruth Data Luo, M., Pullen, S., Akos, D., Xie, G., Datta-Barua, S., Walter, T., Enge, P. K. 2002
  • Worst-Case Analysis of a 3-Frequency Receiver to Land a General Aviation Airplane Jan, S., S., Gebre-Egziabher, D., Walter, T., Enge, P. 2002
  • Estimation of ICAO Threat Model Parameters For Operational GPS Satellites Mitelman, A., Akos, D., Pullen, S., Enge, P. 2002
  • WAAS Performance in the 2001 Alaska Flight Trials of the High Speed Loran Data Channel Enge, K., Per, Sherman, L., et., al. 2002
  • LAAS Ground Facility Design Improvements to Meet Proposed Requirements for Category II/III Operations Pullen, S., Luo, M., Xie, G., Lee, J., Phelts, R., E., Akos, D., Enge, P. K. 2002
  • A Novel Dual-Patch Anti-Jam GPS Antenna Bauregger, F., Walter, T., Akos, D., Enge, P. 2002
  • Transient Performance Analysis of a Multicorrelator Signal Quality Monitor Phelts, R., E., Mitelman, P. A., Enge, K., Per 2001
  • Design and Performance Analysis of a Low-Cost Aided Dead Reckoning Navigation System Gebre-Egziabher, D., Powell, D., J., Enge, P. 2001
  • The Dielectric Cavity Antenna - An Alternative to the Choke Ring Antenna Bauregger, F., Walter, T., Enge, P. 2001
  • Message Type 28 Walter, T., Hansen, A., Enge, P. 2001
  • Testing and Research on Interference to GPS from UWB Transmitters Luo, M., Akos, K., Opshaug, P., Enge, E. 2001
  • Ionospheric Threat Model Methodology for WAAS Blanch, J., Walter, T. 2001
  • Ephemeris Protection Level Equations and Monitor Algorithms for GBAS Enge, K., Per, Pullen, S., Lee, L., Pervan, C. 2001
  • Flight Deck Display of Airborne Traffic Wake Vortices Enge, K., Per, Holforty, W., David, J., Powell 2001
  • A Non-Linear, Two-Step Estimation Algorithm For Calibrating Solid-State Strapdown Magnetometers Enge, K., Per, Gebre-Egziabher, D., Elkaim, G., Powell, D., J., Parkinson, B. 2001
  • Satellite Autonomous Integrity Monitoring and its Role in Enhancing GPS User Performance Vidarsson, L., Pullen, S., Green, G., Enge, P. 2001
  • Analysis of the Enhanced LORAN Data Channel Lo, S., Enge, P. 2001
  • A Local-Area GPS Pseudolite-Based Mars Navigation System Enge, K., Per, LeMaster, E., Rock, S. 2001
  • Assessment of the Probability of a Midair Collision During an Ultra Closely Spaced Parallel Approach Enge, K., Per, Houck, S., Powell, J., D. 2001
  • Improving GPS Coverage and Continuity: Indoors and Downtown Enge, P., Fan, T., Chou, M., Sahai, S., Van, R. 2001
  • The Next Generation Integrity Monitor Testbed (IMT) for Ground System Development and Validation Testing Normark, P., Xie, A., Pullen, L. L., Enge, K., Per 2001
  • GPS and UWB for indoor navigation Opshaug, G., Enge, P. 2001
  • Matlab Simulation Toolset for SBAS Availability Analysis Jan, S., Chan, W., Walter, T., Enge, P. 2001
  • System Identification for Precision Control of a GPS-Autonomous Catamaran Enge, K., Per, Elkaim, G., Parkinson, B. 2001
  • LAAS Sigma-Mean Monitor Analysis and Failure-Test Verification Lee, J., Pullen, X., Enge, Per, K. 2001
  • Integrity Design and Updated Test Results for the Stanford LAAS Integrity Monitor Testbed Enge, Per, K., Xie, G., Pullen, L., Normark, A., Pervan, E. L. 2001
  • Optimization of Cascade Integer Resolution with Three Civil GPS Frequencies Jung, J., Enge, P., Pervan, B. 2000
  • Flying a Tunnel-in-the-Sky Display Within the Current Airspace System Enge, Per, K., Barrows, Andrew, K., Powell, J., David 2000
  • Broadcasting Data from an SBAS Reference Network over using LORAN Lo, S., Enge, P. 2000
  • A Parametric Sensitivity Study of Ultra Closely Spaced Parallel Approaches Enge, K., Per, Houck, S., Powell, J., D. 2000
  • Correlation Structure of Ionospheric Estimation and Correlation for WAAS Hansen, A., Peterson, E., Walter, T., Enge, P. 2000
  • Some Capabilities of a Joint GPS-LEO Navigation System Enge, K., Per, Parkinson, M., Rabinowitz, Spilker, J. 2000
  • Architectures for Joint GPS/LEO Satellite Carrier Phase Receivers Designed for Rapid Robust Resolution of Carrier Cycle Ambiguities on Mobile Platorms Enge, K., Per, Rabinowitz, M., Parkinson, B., Gromov, K., Cohen, C. 2000
  • A Real-Time Signal Quality Monitor for GPS Augmentation Systems Mitelman, A., Phelts, R., E., Akos, D., Pullen, S., Enge, P. 2000
  • Using GPS to Synthesize A Large Antenna Aperture When the Elements Are Mobile Shau-Shiun, J. J., Enge, P. 2000
  • Ionospheric Correlation Anaysis for WAAS: Quiet and Stormy Hansen, A., Blanch, J., Walter, T., Enge, P. 2000
  • A DME Based Area Navigation System for GPS/WAAS Interference Mitigation In General Aviation Applications Enge, K., Per, Gebre-Egziabher, D., David Powell, J. 2000
  • Robust Detection of Ionospheric Irregularities Walter, T., Hansen, A., Blanch, J., Enge, P. 2000
  • Burst Mode Message Loss Effects On WAAS Availability Fuller, R., Walter, T. 2000
  • The Case for Narrowband Receivers Phelts, R., E., Enge, P. 2000
  • Data Transmission Using LORAN-C Lo, S., Enge, P. 2000
  • Field Test Results for a Self-Calibrating Pseudolite Array Enge, K., Per, LeMaster, E., Rock, S. 2000
  • Robust Signal Quality Monitoring and Detection of Evil Waveforms Phelts, R., E., Akos, D., Enge, P. 2000
  • Interference to GPS from UWB Transmitters Luo, M., Akos, D., Pullen, S., Enge, P. 2000
  • Robotic snow cat Opshaug, G., Enge, P. 2000
  • Visual, Cruise Formation Flying Dynamics Enge, K., Per, Houck, S., Powell, J., D. 2000
  • GIDL: Generalized Interference Detection and Localization System Gromov, K., Akos., D., Pullen, S., Enge, P., Parkinson, B. 2000
  • A Gyro-Free Quaternion-Based Attitude Determination System Suitable for Implementation Using Low Cost Sensors Enge, K., Per, Gebre-Egziabher, D., Elkaim, G., Powell, J., David 2000
  • Low Power Global Navigation Satellite System (GNSS) Signal Detection and Processing Enge, K., Per, Akos, D., Normark, P-L., Lee, J-T., Gromov, K., Tsui, J. 2000
  • The Multipath Invariance Approach for Code Multipath Mitigation Phelts, R., E., Enge, P. 2000
  • Synthetic Vision Displays for Instrument Landings and Traffic Awareness - Development and Flight Testing Enge, K., Per, Jennings, C., Powell, J., D. 2000
  • Multipath Mitigation for Narrowband Receivers Phelts, R., E., Enge, P. 2000
  • Broadcasting Data from an SBAS Reference Network over Low Rate Broadcast Channels Lo, S., Enge, P. 2000
  • Tunnel-in-the-Sky Cockpit Display for Complex Remote Sensing Flight Trajectories Enge, K., Per, Barrows, A., Powell, J., D. 1999
  • Flight Trials of a Geostationary Satellite Based Augmentation System at High Latitudes and for Dual Satellite Coverage Fuller, Richard, A., Walter, T., Houck, S., Enge, P. 1999
  • The Effects of Local Ionospheric Decorrelation on LAAS: Theory and Experimental Results Enge, Per, K., Christie, Jock, R. I., Ko, P., Hansen, A., Dai, D., Pullen, S. 1999
  • GPS Supplemental Navigation Systems for Use During the Transition to a Sole-Means-GPS National Airspace System Gebre-Egziabher, D., Lo, S., Powell, J., David, Enge, P. 1999
  • Alaskan Flight Trials of a Synthetic Vision System for Instrument Landings of a Piston Twin Aircraft Enge, K., Per, Alter, A., Barrows, Jennings, C., K, Powell, J., D. 1999
  • Validation of the WAAS MOPS Integrity Equation Walter, T., Hansen, A., Enge, P. 1999
  • LAAS Monitoring For A Most Evil Satellite Failure Mitelman, A., Jung, J., Enge, P. 1999
  • GPS Receiver Satellite/Antenna Selection Algorithm for the Stanford Gravity Probe B Relativity Mission Enge, Per, K., Li, J., Ndili, A., Ward, L., Buchman, S. 1999
  • Self-Calibration of Pseudolite Arrays Using Self-Differencing Transceivers Enge, K., Per, LeMaster, E., Rock, S. 1999
  • Flight Testing WAAS for Use in Closely Spaced Parallel Approaches Houck, S., Barrows, A., Parkinson, B., Enge, P., D., J., Powell 1999
  • Interference Direction Finding for Aviation Applications of GPS Gromov, K., Akos., D., Pullen, S., Enge, P., Parkinson, B., Pervan, B. 1999
  • Software-based Multipath Mitigation: Sampling for Multipath Invariance Phelts, R., E., Stone, J., Enge, P., Powell, J., D. 1999
  • High Integrity Carrier Phase Navigation for Future LAAS Using Multiple Civilian GPS Signals Enge, K., Per, Jung, J. 1999
  • WAAS MOPS: Practical Examples Enge, Per, K., Walter, T. 1999
  • GPS Pseudolite Transceivers and their Applications Enge, Per, K., Stone, Jonathan, M., LeMaster, Edward, A., Powell, J., David, Rock, S. 1999
  • 3-D Perspective Displays for Guidance and Traffic Awareness Jennings, C., Alter, K., Barrows, A., Enge, P., Powell, J., D. 1999
  • Single Baseline GPS Based Attitude Heading Reference System (AHRS) for Aircraft Applications Enge, K., Per, Hayward, R., Marchick, A., David, J., Powell 1999
  • Land-vehicle Navigation Using GPS Enge, K., Per, Abbott, E. 1999
  • Special issue on Global Positioning System PROCEEDINGS OF THE IEEE Enge, P., Misra, P. 1999; 87 (1): 3-15
  • Local area augmentation of GPS for the precision approach of aircraft PROCEEDINGS OF THE IEEE Enge, P. 1999; 87 (1): 111-132
  • Mars Exploration Using Self-Calibrating Pseudolite Arrays Enge, K., Per, LeMaster, E., Stephen, R. 1998
  • GPS Receiver Autonomous Interference Detection Ndili, A., Per, E. 1998
  • GPS-Based Attitude for Aircraft Enge, K., Per, Hayward, C., Roger, Gebre-Egziabher, D., Powell, J., David 1998
  • A Multiple Hypothesis Approach to Satellite Navigation Integrity NAVIGATION, Journal of the ION Journal of the Institute of Navigation Enge, Per, K., Pervan, Boris, S., Pullen, Samuel, P., Christie, Jock, R. 1998; 45 (1): 61-71
  • Interoperation and Integration of Satellite Based Augmentation Systems Fuller, Richard, A., Dai, D., Walter, T., Comp, C., Enge, P., Powell, J., David 1998
  • Flight Test Evaluation of an Alternative Local Area Augmentation System Architecture NAVIGATION, Journal of the ION Journal of the Institute of Navigation Pervan, B., Lawrence, D., Gromov, K., Opshaug, G., Christie, J., Ko, P., Enge, P. K. 1998; 45 (1): 31-38
  • A Low-Cost GPS/Inertial Attitude Heading Reference System (AHRS) for General Aviation Applications Enge, K., Per, Gebre-Egziabher, D., Hayward, C., Roger, Powell, J., David 1998
  • Real Time Calibration of Antenna Phase Errors for Ultra Short Baseline Attitude Systems Enge, Per, K., Hayward, Roger, C., Powell, J., David 1998
  • Analytical and Experimental Observations of Ionospheric and Tropospheric Decorrelation Effects for Differential Satellite Navigation during Precision Approach Christie, R., Jock, Ko, I., Ping-Ya, Pervan, S., Boris, Enge, K., Per, Powell, J., David, Parkinson, W., Bradford 1998
  • Algorithms for crossover point determination COMPUTERS & MATHEMATICS WITH APPLICATIONS Lo, S., Kee, C., Enge, P. 1997; 33 (11): 117-131
  • Flight test evaluation of a prototype local area augmentation system architecture ION GPS-97, PT 1 AND 2 Pervan, B., LAWRENCE, D., Gromov, K., Opshaug, G., Christie, J., Ko, P. Y., Mitelman, A., Pullen, S., Enge, P., Parkinson, B. 1997: 1613-1621
  • Development, Implementation, and Testing of a Prototype LAAS Architecture Pervan, Boris, S., Pullen, Samuel, P., Lawrence, David, G., Gromov, K., Christie, Jock, R.I., Opshaug, G., Enge, P. K. 1997
  • Flight Test Evaluation of a Prototype Local Area Augmentation System Architecture Pervan, B., Lawrence, D., Gromov, K., Opshaug, G., Christie, J., Ping-Ya, K., Enge, P. K. 1997
  • System identification of an autonomous aircraft using GPS ION GPS-97, PT 1 AND 2 Evans, J., Elkaim, G., Lo, S., Parkinson, B. 1997: 1065-1071
  • Ionospheric Correction Using Tomography Hansen, A., Todd, W., Per, E. 1997
  • An Integrity Equation for Use with Space Based Augmentation Systems Walter, T., Enge, P., Hansen, A. 1997
  • Inertially Aided GPS Based Attitude Heading Reference System (AHRS) for General Aviation Aircraft Enge, K., Per, Hayward, C., Roger, Gebre-Egziabher, D., Schwall, J., Matt, David, P., John, W. 1997
  • A Proposed Signal Design for GNSS2: The Use of Faster and Longer Codes to Provide Real-Time Single Frequency Ionospheric Measurements Christie, Jock, R.I., Parkinson, Bradford, W., Enge, Per, K. 1997
  • System Identification and Robust Control of Farm Vehicles Using Carrier-Phase Differential GPS Enge, K., Per, Elkaim, G., Michael, O., Thomas, B., Parkinson, B., W. 1997
  • Receiver Autonomous Interference Detection Ndili, A., Enge, P. 1997
  • Operational Experience with and Improvements to a Tunnel-in-the-Sky Display for Light Aircraft Barrows, A., Alter, K., Enge, P., Parkinson, B., Powell, J., D. 1997
  • Ionospheric correction using tomography ION GPS-97, PT 1 AND 2 Hansen, A. J., Walter, T., Enge, P. 1997: 249-257
  • Operational experience with and improvements to a tunnel-in-the-sky display for light aircraft ION GPS-97, PT 1 AND 2 Barrows, A. K., Alter, K. W., Enge, P., Parkinson, B. W., Powell, J. D. 1997: 791-799
  • Improving WAAS integrity and availability: UDRE and GIVE time updates ION GPS-97, PT 1 AND 2 COMP, C., Gazit, R., Walter, T., Enge, P. 1997: 1315-1324
  • Dual tone signalling to mitigate self-skywave interference to DGPS broadcasts from radiobeacons ION GPS-97, PT 1 AND 2 Enge, P., Young, D., Butler, B. 1997: 995-1004
  • Comparison of master station and user algorithms for wide-area augmentation system JOURNAL OF GUIDANCE CONTROL AND DYNAMICS Kee, C., Walter, T., Chao, Y. C., Tsai, Y. J., Enge, P., Parkinson, B. W. 1997; 20 (1): 170-176
  • High integrity multipath mitigation techniques for ground reference stations ION GPS-97, PT 1 AND 2 Dai, D. H., Walter, T., Comp, C. J., Tsai, Y. J., Ko, P. Y., Enge, P., Powell, J. D. 1997: 593-604
  • A proposed integrity equation for WAAS MOPS ION GPS-97, PT 1 AND 2 Walter, T., Enge, P., Hansen, A. 1997: 475-484
  • Ionospheric estimation and integrity threat detection PROCEEDINGS OF THE NATIONAL TECHNICAL MEETING - NAVIGATION AND POSITIONING IN THE INFORMATION AGE Hansen, A. J., Chao, Y. C., Walter, T., Enge, P. 1997: 883-889
  • Wide area augmentation of the global positioning system PROCEEDINGS OF THE IEEE Enge, P., Walter, T., Pullen, S., Kee, C., Chao, Y. C., Tsai, Y. J. 1996; 84 (8): 1063-1088
  • Integration of wide area DGPS with local area kinematic DGPS LAWRENCE, D., Evans, J., Chao, Y. C., Tsai, Y. J., Cohen, C., Walter, T., Enge, P., Powell, J. D., Parkinson, B. I E E E. 1996: 523-529
  • The Effect of the Ionosphere and C/A Frequency on GPS Signal Shape: Considerations for GNSS-2 Christie, J., Jock, I., R., Parkinson, W., Bradford, Enge, Per, K. 1996
  • GPS Based Attitude Determination On Nonaligned Antenna Arrays NAVIGATION, Journal of the ION Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997), Kansas City, MO Enge, Per, K., Montgomery, P., Parkinson, Bradford, W. 1996
  • Performance Evaluation of On-Airport Local Area Augmentation System Architectures Lawrence, David, G., Cobb, S., Pervan, B., Opshaug, G., Enge, P., Powell, J., David 1996
  • System Identification of a Farm Vehicle Using Carrier-Phase Differential GPS Enge, K., Per, Elkaim, G., Michael, O., Thomas, B., Parkinson, B., W. 1996
  • Flying Curved Approaches and Missed Approaches: 3-D Display Trials Onboard a Light Aircraft Barrows, K., Andrew, Enge, Per, K., Bradford, W., Parkinson, Powell, J., David 1996
  • Techniques for Real-Time Control of Flexible Structures using GPS Enge, Per, K., Harris, Teague, E., How, Jonathan, P., Lawson, London, G., Boerjes, M., Parkinson, Bradford, W. 1996
  • Automatic Steering of Farm Vehicles Using GPS Enge, Per, K., O'Connor, M., Bell, T., Elkaim, G., Parkinson, B. 1996
  • A New Motion-Based Algorithm for GPS Attitude Integer Resolution NAVIGATION, Journal of the ION Journal of the Institute of Navigation Enge, Per, K., Conway, A., Montgomery, P., Rock, S., Cannon, R., Parkinson, B., W. 1996; 43 (2): 179-190
  • Carrier Differential GPS for Takeoff to Landing of an Autonomous Aircraft NAVIGATION, Journal of the ION Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996) September 1996, Kansas City, MO Enge, Per, K., Lightsey, E., Glenn, Parkinson, Bradford, W. 1996: 1081-1090
  • GPS Receiver Development and Verification Tests for the Stanford Gravity Probe B Relativity Mission - Verification Test Plan and Preliminary Results NAVIGATION, Journal of the ION Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997), Kansas City, MO Enge, Per, K., Uematsu, H., Parkinson, Bradford, W. 1996: 1377-1385
  • GPS-Based Attitude and Guidance Displays for General Aviation Enge, Per, K., Barrows, Andrew, K., Gebre-Egziabher, D., Hayward, R., Xia, R., Powell, J., David 1996
  • A Comprehensive Integrity Verification Architecture for On-Airport LAAS Category III Precision Landing Pullen, S., Pervan, B., Enge, P., Parkinson, Bradford, W. 1996
  • Digital Tracking Filters with High Order Correlated Measurement Noise IEEEXplore Aerospace and Electronic Systems, IEEE Transactions Enge, Per, K., Gazit, R. 1996; 33 (1): 171-177
  • Carrier Differential GPS for Real-Time Control of Large Flexible Structures Enge, Per, K., Teague, E., Harris, How, Jonathan, P., Parkinson, Bradford, W. 1996
  • Study of WAAS Ionospheric Integrity NAVIGATION, Journal of the ION Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997), Kansas City, MO Yi-chung, C., Samuel, P., Enge, P., K., Parkinson, B., W. 1996: 781-788
  • Carrier Phase DGPS for Closed-Loop Control of Farm and Construction Vehicles NAVIGATION, Journal of the ION Journal of the Institute of Navigation Enge, Per, K., O'Connor, Michael, L., Elkaim, Gabriel, H. 1996; 43 (2): 167-178
  • Generation of ionospheric correction and confidence estimates for WAAS Chao, Y. C., Tsai, Y. J., Evans, J., Kee, C., Walter, T., ENGE, P. K., Powell, J. D., Parkinson, B. W. INST NAVIGATION. 1996: 139-146
  • Quality control algorithms on Wide-area Reference Station for WAAS Kee, C., Walter, T., Enge, P., Parkinson, B. INST NAVIGATION. 1996: 487-495
  • Effects of local ionospheric anomalies on navigation performance and integrity using WAAS Pullen, S. P., Chao, Y. C., ENGE, P. K., Parkinson, B. W. I E E E. 1996: 574-581
  • Control system optimization with unbounded uncertainty: Application to aircraft precision approach using GPS Pullen, S. P., ENGE, P. K., Parkinson, B. W. IEEE. 1996: 1339-1340
  • Continuity improvements via inertial augmentation of GPS-based landing system Ko, P. Y., Enge, P., Powell, J. D. I E E E. 1996: 153-160
  • Flight tests of a 3-D perspective-view glass-cockpit display for general aviation using GPS Barrows, A., Enge, P., Parkinson, B., Powell, J. D. INST NAVIGATION. 1995: 1615-1622
  • Aircraft Tracking using GPS Position and Velocity Reports NAVIGATION, Journal of the ION Presented at ION GPS '95 Enge, Per, K., Gazit, R. 1995
  • Maintaining GPS Positioning in Steep Turns Using Two Antennas NAVIGATION, Journal of the ION Presented at ION GPS '95 Enge, Per, K., David, L., Cobb, H., Stewart, Cohen, C., Pervan, B., Powell, J., David 1995
  • Kinematic GPS for Closed Loop Control of Farm and Construction Vehicles Enge, Per, K., O'Connor, Michael, L., Elkaim, Gabriel, H., Bradford, W., Parkinson 1995
  • Automatic Landing of a 737 using GNSS Integrity Beacons Enge, Per, K., Cohen, Clark, E., Cobb, H., Stewart, Lawrence, David, G., Pervan et. al., Boris, S. 1995
  • A New Method for Coverage Prediction for the Wide Area Augmentation System (WAAS) Pullen, Samuel, P., Enge, Per, K., Parkinson, Bradford, W. 1995
  • High Integrity GPS-Based Precision Landing Using Integrity Beacon Pseudolites Enge, Per, K., Pervan, Boris, S., Cohen, Clark, E., Lawrence, David, G., Cobb, H., Stewart, Powell, J., David 1995
  • Evaluation of Orbit and Clock Models for Real Time WAAS NAVIGATION, Journal of the ION Presented at the 1995 National Technical Meeting of The Institute of Navigation Tsai, Y., J., Chao, Y., C., Walter, T., Kee, C., Powell, D., Enge, P. 1995
  • The Ionospheric Model Improvement for the Stanford WAAS Network NAVIGATION, Journal of the ION Presented at the 1995 National Technical Meeting of The Institute of Navigation Chao, Y., C., Tsai, Y., J., Walter, T., Kee, C., Enge, P., Parkinson, Bradford, W. 1995
  • A Real-Time Architecture for Kinematic GPS Applied to the Integrity Beacon Landing System Enge, Per, K., Lawrence, D., Pervan, B., Cohen, C., Cobb, H., Stewart, Powell, J., David 1995
  • A History Of Satellite Navigation NAVIGATION, Journal of the ION Journal of the Institute of Navigation Enge, Per, K., Parkinson, Bradford, W. 1995; 42 (1): 109-164
  • Weighted RAIM for Precision Approach Walter, T., Enge, P. 1995
  • Precision Landing Tests with Improved Integrity Beacon Pseudolites Enge, Per, K., Cobb, H., Stewart, Lawrence, David, G., Pervan, Boris, S., Cohen, Clark, E., Powell, J., David 1995
  • Observed GPS Signal Continuity Interruptions Enge, Per, K., Cobb, H., Stewart, Lawrence, David, G., Christie, Jock, R.I., Walter, Todd, F., Chao, Y., C. 1995
  • Full State Estimation and Control of a Large Model Aircraft Using Carrier Phase Differential GPS Enge, Per, K., Paul, M., Uematsu, H., Bradford, W., Parkinson 1995
  • GPS as a Structural Deformation Sensor Enge, Per, K., Harrison, Teague, E., How, Jonathan, P., Lawson, London, G., Parkinson, Bradford, W. 1995
  • An Examination of the Relative Merits of Various Sensors for Vehicle Navigation Enge, Per, K., Abbott, E., Powell, D. 1995
  • An algorithm for inter-frequency bias calibration and application to WAAS ionosphere modeling Chao, Y. C., Tsai, Y. J., Walter, T., Kee, C. D., Enge, P., Parkinson, B. INST NAVIGATION. 1995: 639-646
  • Weighted RAIM for precision approach Walter, T., Enge, P. INST NAVIGATION. 1995: 1995-2004
  • Global optimization of GPS augmentation architectures using genetic algorithms Pullen, S., Enge, P., Parkinson, B. INST NAVIGATION. 1995: 1403-1415
  • Validation or the RTCA message format for WAAS Tsai, Y. J., Enge, P., Chao, Y. C., Walter, T., Kee, C. D., Evans, J. INST NAVIGATION. 1995: 661-670
  • FLIGHT TRIALS OF THE WIDE AREA AUGMENTATION SYSTEM (WAAS) Walter, T., Kee, C., Chao, Y. C., Tsai, Y. J., PELED, U., Ceva, J., Barrows, A., Abbot, E., Powell, J. D., Enge, P., Parkinson, B. INST NAVIGATION. 1994: 1537-1546
  • Space Flight Tests of Attitude Determination using GPS International Journal of Satellite Communications Enge, Per, K., Cohen, Clark, E., Lightsey, E., Glenn, Parkinson, Bradford, W., Feess, William, A. 1994; 12: 427-433
  • Flight Test Results of Autocoupled Approaches using GPS and Integrity Beacons NAVIGATION, Journal of the ION Presented at ION GPS '94. Enge, Per, K., Cohen, D. C., Lawrence, B. P., Cobb, Stewart, H., Barrows, A. D., Powell, W., Bradford 1994
  • Antenna Baseline and Line Bias Estimation Using Pseudolites for GPS-based Attitude Determination NAVIGATION, Journal of the ION Presented at ION GPS '94. Enge, Per, K., Uematsu, H., Parkinson, W., Bradford 1994
  • A New Approach to GPS Integrity Monitoring Using Prior Probability Models and Optimal Threshold Search Enge, Per, K., Pullen, Samuel, P., Pervan, B., Parkinson, Bradford, W. 1994
  • Development of a GPS Receiver for Reliable Real-Time Attitude Determination in Space NAVIGATION, Journal of the ION Presented at ION GPS '94. Enge, Per, K., Glenn, Lightsey, E., Cohen, C., Parkinson, Bradford, W. 1994
  • Communication Protocols for GPS-based Surveillance and TCAS NAVIGATION, Journal of the ION Presented at ION GPS '94 Enge, Per, K., Gazit, R., Powell, David, J. 1994
  • Autonomous Integrity Monitoring for GPS-based Precision Landing using Ground-based Integrity Beacon Pseudolites NAVIGATION, Journal of the ION Presented at ION GPS '94. Enge, Per, K., Pervan, B., Cohen, C., Lawrence, D., Cobb, Stewart, H., Powell, David, J. 1994
  • Wide Area Differential GPS as a Future Navigation System in the U.S. Enge, Per, K., Kee, C., Parkinson, Bradford, W. 1994
  • Autonomous Integrity Monitoring for Precision Approach using DGPS and a Ground-based Pseudolite Enge, Per, K., Pervan, Boris, S., Cohen, C., Parkinson, Bradford, W. 1994
  • Integrity in Cycle Ambiguity Resolution for GPS-based Precision Landing Enge, Per, K., Pervan, Boris, S., Cohen, Clark, E., Parkinson, Bradford, W. 1994
  • Achieving Required Navigation Performance using GNSS for Category III Precision Landing Enge, Per, K., Cohen, Clark, E., Pervan, B., Cobb, Stewart, H., Lawrence, David, G., Powell, J., David 1994
  • Real-Time Flight Testing Using Integrity Beacons for GPS Category III Precision Landing NAVIGATION, Journal of the ION Journal of the Institute of Navigatio Enge, Per, K., Cohen, C., Pervan, B., Lawrence, David, H., Cobb, S., David, J. 1994; 41 (2)
  • Calibration of Multipath Errors on GPS Pseudorange Measurements NAVIGATION, Journal of the ION Presented at ION GPS '94. Enge, Per, K., Kee, C., Parkinson, Bradford, W. 1994
  • Analysis of Angular Velocity Determination Using GPS NAVIGATION, Journal of the ION Presented at ION GPS '94. Enge, Per, K., Montgomery, P., Uematsu, H., Parkinson, Bradford, W. 1994
  • Analysis of Spacecraft Attitude Measurements using Onboard GPS Enge, Per, K., Lightsey, E., Glenn, C. C., Feess, William, A., Parkinson, Bradford, W. 1994
  • GPS Pseudolite Signal Design Enge, Per, K., Ndili, A. 1994
  • Theory and Design of Pseudolites NAVIGATION, Journal of the ION Presented at ION National Technical Meeting. Enge, Per, K., Cobb, H., Stewart, Clark, E., Parkinson, C. B. 1994
  • SIMULATION-BASED EVALUATION OF WAAS PERFORMANCE - RISK AND INTEGRITY FACTORS Pullen, S., Enge, P., Parkinson, B. INST NAVIGATION. 1994: 975-983
  • THE WIDE AREA AUGMENTATION SYSTEM (WAAS) SIGNAL SPECIFICATION VANDIERENDONCK, A. J., Enge, P. INST NAVIGATION. 1994: 985-994
  • AUTONOMOUS INTEGRITY MONITORING AND WIDE AREA DGPS Walter, T., Pervan, B., Enge, P., HERENDEEN, J., Levin, P. L. INST NAVIGATION. 1994: 155-163
  • DGPS RADIOBEACON FIELD TRIALS, WHICH COMPARE TYPE-1 AND TYPE-9 MESSAGING Enge, P., Young, D., SHEYNBLAT, L., Westfall, B. INST NAVIGATION. 1993: 671-680
  • The Statistics of Selective Availability and Its Effect on Differential GPS NAVIGATION, Journal of the ION Presented at ION GPS '93 Enge, Per, K., Chao, Y., Parkinson, Bradford, W. 1993
  • Translation, Rotation and Vibration Control of Large Space Structures using Self-differential GPS (SDGPS) Enge, Per, K., Teague, H., Parkinson, Bradford, W. 1993
  • Application of GPS Attitude Determination to Gravity Gradient Stabilized Spacecraft Enge, Per, K., Lightsey, E., Glenn, Cohen, Clark, E., Parkinson, Bradford, W. 1993
  • Real-time Cycle Ambiguity Resolution using a Pseudolite for Precision Landing of Aircraft with GPS Enge, Per, K., Cohen, C., Pervan, B., Cobb, H., Stewart, Lawrence, D., Powell, J., David 1993
  • Multipath Interference in Orbiting Receivers Due to Earth Surface Reflections NAVIGATION, Journal of the ION Presented at ION GPS '93 Enge, Per, K., Ceva, J., Parkinson, Bradford, W. 1993
  • Autonomous Integrity Monitoring for Precision Approach using DGPS and a Ground-based Pseudolite NAVIGATION, Journal of the ION Presented at ION GPS '93 Enge, Per, K., Pervan, Boris, S., Cohen, Clark, E., Parkinson, Bradford, W. 1993
  • High Accuracy GPS Positioning in the Continent: Wide Area Differential GPS Enge, Per, K., Kee, C., Parkinson, Bradford, W. 1993
  • Real-time Flight Test Evaluation of the GPS Marker Beacon Concept for Category III Kinematic GPS Precision Landing NAVIGATION, Journal of the ION Presented at ION GPS '93 Enge, Per, K., Cohen, Clark, E., Pervan, Boris, S., Lawrence, David, G., Cobb, Stewart, H. 1993
  • Static Test Results of Wide Area Differential GPS NAVIGATION, Journal of the ION Presented at ION GPS '93 Enge, Per, K., Kee, C., Parkinson, Bradford, W. 1993
  • Space Flight Tests of Attitude Determination Using GPS: Preliminary Results NAVIGATION, Journal of the ION Presented at ION GPS '93 Enge, Per, K., Cohen, Clark, E., Lightsey, Glenn, E., Parkinson, Bradford, W., Feess, William, A. 1993
  • Flight Tests of Attitude Determination Using GPS Compared Against an Inertial Navigation Unit NAVIGATION, Journal of the ION Presented at the ION National Technical Meeting Enge, Per, K., Cohen, Clark, B., McNally, D., Parkinson, Bradford, W. 1993
  • Estimation of Absolute Ionospheric Delay Exclusively through Single-Frequency GPS Measurements NAVIGATION, Journal of the ION Presented at ION GPS '92 Enge, Per, K., Cohen, C., Pervan, B., Parkinson, Bradford, W. 1992
  • Generalizing Wahba's Problem for High Output Rates and Evaluation of Static Accuracy using a Theodolite NAVIGATION, Journal of the ION Presented at ION GPS '92 Enge, Per, K., Cohen, C., Cobb, S. H., Parkinson, Bradford, W. 1992
  • Aircraft Applications of GPS-based Attitude Determination ABSTRACT NAVIGATION, Journal of the ION Presented at ION GPS '92 Enge, Per, K., Cohen, C., Parkinson, Bradford, W. 1992
  • Integer Ambiguity Resolution of the GPS Carrier for Spacecraft Attitude Determination Enge, Per, K., Cohen, C., Parkinson, Bradford, W. 1992
  • Algorithms and Implementation of Wide Area Differential GPS NAVIGATION, Journal of the ION Presented at ION GPS '92 Enge, Per, K., Kee, C., Parkinson, Bradford, W. 1992
  • Expanding the Performance Envelope of GPS-Based Attitude Determination NAVIGATION, Journal of the ION Presented at ION/GPS Conference Enge, Per, K., Cohen, C., Parkinson, Bradford, W. 1991
  • Mitigating Multipath Error in GPS-based Attitude Determination Enge, Per, K., Cohen, C., Parkinson, Bradford, W. 1991
  • Wide Area Differential GPS Outstanding Paper Award Winner NAVIGATION, Journal of the ION Presented at ION Satellite Division 3rd International Technical Meeting Enge, Per, K., Kee, C., Parkinson, Bradford, W., Axelrad, P. 1990
  • Techniques for Autonomous GPS Integrity Monitoring Published by Advisory Group for Aerospace Research and Development (AGARDograph, No. 314). Enge, Per, K., Parkinson, Bradford, W., Penina, A. 1990
  • Autonomous GPS Integrity Monitoring Using the Pseudorange Residual NAVIGATION, Journal of the ION Journal of the Institute of Navigation Enge, Per, K., Parkinson, Bradford, W., Axelrad, P. 1988; 35 (2)
  • A Basis for the Development of Operational Algorithms for Simplified GPS Integrity Checking Enge, Per, K., Parkinson, Bradford, W., Axelrad, P. 1988
  • Aircraft Automatic Landing Systems Using GPS Enge, Per, K., Parkinson, Bradford, W., Fitzgibbon, Kevin, T. 1988
  • The Application of NAVSTAR Differential GPS in the Civilian Community NAVIGATION, Journal of the ION Journal of the Institute of Navigation Enge, Per, K., Beser, J., Parkinson, Bradford, W. 1987; 29 (2)
  • The Use of Pseudo-Satellites for Improving GPS Performance NAVIGATION, Journal of the ION Journal of the Institute of Navigation Enge, Per, K., Klein, D., Parkinson, Bradford, W. 1987; 31 (4)
  • Optimal Locations of Pseudolites for Differential GPS NAVIGATION, Journal of the ION Journal of the Institute of Navigation Enge, Per, K., Parkinson, Bradford, W., Fitzgibbon, Kevin, T. 1987; 33 (4)
  • Simplified GPS Integrity Checking with Multiple Satellites Enge, Per, K., Parkinson, Bradford, W., Axelrad, P. 1987
  • A Basis for the Development of Operational Algorithms for Simplified GPS Integrity Checking Enge, Per, K., Bradford W., Parkinson, Axelrad, P. 1987
  • NAVSTAR: Global Positioning System - Ten Years Later Enge, Per, K., Parkinson, Bradford, W., Gilbert, S., W. 1987