Robust Beampattern Synthesis for
UAV-Swarm-Based Distributed Beamforming
| W.J. Morrison, D.A. Ton-Nu, T.E. Humphreys | Conference Paper | 2024 |
HOOC-EM: Fast Beam Sweeping for LEO
Mega-Constellation Customer Terminals
| S. C. Morgan, T.E. Humphreys | Conference Paper | 2024 |
OFDM-Based Positioning with Unknown Data
Payloads: Bounds and Applications to LEO PNT
| A. M. Graff, T.E. Humphreys | Journal Paper | Under Review |
Ziv-Zakai-Optimal OFDM Resource Allocation for Time-of-Arrival Estimation
| A. M. Graff, T.E. Humphreys | Journal Paper | Under Review |
Demonstration of Single-Satellite GNSS Spoofer
Geolocation | Z. Clements, I. Goodridge, P. Ellis, M. Murrian, T.E. Humphreys | Conference Paper | 2024 |
Trusted Inertial Terrain-Aided Navigation
(TITAN)
| T. Haydon, T.E. Humphreys | Conference Paper | 2023 |
An Agile, Portable Antenna System for LEO
Megaconstellation-Based PNT | W. Qin, Z. M. Komodromos, T.E. Humphreys | Conference Paper | 2023 |
| Signal Simulator for Starlink Ku-Band Downlink | Z. M. Komodromos, W. Qin, T.E. Humphreys | Conference Paper | 2023 |
| Purposeful Co-Design of OFDM Signals for Ranging and Communications | A. M. Graff, T.E. Humphreys | Journal Paper | 2024 |
Signal Identification and Entrainment for Practical
FMCW Radar Spoofing Attacks | A. M. Graff, T.E. Humphreys | Conference Paper | 2023 |
| Pinpointing GNSS Interference from Low Earth Orbit | Z. Clements, P. Ellis, T.E. Humphreys | Magazine Article | 2023 |
| Dual-Satellite Geolocation of Terrestrial GNSS Jammers from Low Earth Orbit | Z. Clements, T.E. Humphreys, P. Ellis | Conference Paper | 2023 |
Robust Absolute Headset Tracking for
Extended Reality
| R. M. Tenny, L. C. Sun, A. Duru, T.E. Humphreys | Conference Paper | 2023 |
Signal Structure of the Starlink Ku-Band Downlink
| T.E. Humphreys, P. A. Iannucci, Z. M. Komodromos, A. M. Graff | Journal Paper | 2023 |
GNSS spoofing Detection: An Approach for Ground Vehicles Using Carrier-Phase and Inertial Measurement Data
| Z. Clements, J.E. Yoder, T.E. Humphreys | Magazine Article | 2023 |
Quasi-Nash Optimal Algorithm for Reach and
Avoid Differential Game
| Z. M. Komodromos, N.G. Montalbano, T.E. Humphreys | White Paper | 2022 |
Robust Navigation for Urban Air Mobility via Tight
Coupling of GNSS with Terrestrial Radionavigation and
Inertial Sensing | R. Tenny, T.E. Humphreys | Conference Paper | 2022 |
Software-Defined GNSS is Ready for Launch
| H. Nichols, M.J. Murrian, T.E. Humphreys | Conference Paper | 2022 |
Geolocation of Terrestrial GNSS Spoofing Signals from
Low Earth Orbit | Z. Clements, P. Ellis, M.L. Psiaki, T.E. Humphreys | Conference Paper | 2022 |
Fused Low-Earth-Orbit GNSS
| P.A. Iannucci, T.E. Humphreys | Journal Paper | 2022 |
Carrier-phase and IMU based GNSS Spoofing Detection
for Ground Vehicles | Z. Clements, J.E. Yoder, T.E. Humphreys | Conference Paper | 2022 |
Low-Cost Inertial Aiding for Deep-Urban
Tightly-Coupled Multi-Antenna Precise GNSS | J.E. Yoder, T.E. Humphreys
| Journal Paper | 2023 |
| Analysis of OFDM Signals for Ranging and Communications | A.M. Graff, W.N. Blount, P.A. Iannucci, J.G. Andrews, T.E. Humphreys | Conference Paper | 2021 |
| Optimized Bit-Packing for Bit-Wise Software-Defined GNSS Radio | Z. Clements, P.A. Iannucci, T.E. Humphreys | Conference Paper | 2021 |
| Orbital War Driving: Assessing Transient GPS Interference from LEO | D.M. LaChapelle, L. Narula, T.E. Humphreys | Conference Paper | 2021 |
| Autonomous Signal-Situational-Awareness in a Terrestrial Radionavigation System | R.X.T. Kor, P.A. Iannucci, T.E. Humphreys | Conference Paper | 2021 |
| Long Range, Low SWaP-C FMCW Radar | W.A. Lies, L. Narula, P.A. Iannucci, T.E. Humphreys | Journal Paper | 2021 |
| First results from three years of GNSS Interference Monitoring from Low Earth Orbit | M.J. Murrian, L. Narula, P.A. Iannucci, S. Budzien, B.W. O'Hanlon, M.L. Psiaki, T.E. Humphreys | Journal Paper | 2021 |
| Towards All-Weather sub-50-cm Radar-Inertial Positioning | L. Narula, P.A. Iannucci, T.E. Humphreys | Journal Paper | 2021 |
| Multi-Antenna Vision-and-Inertial-Aided CDGNSS for Micro Aerial Vehicle Pose Estimation | J.E. Yoder, P.A. Iannucci, L. Narula, T.E. Humphreys | Conference Paper | 2020 |
| Open-World Virtual Reality Headset Tracking | T.E. Humphreys, R.X.T. Kor, P.A. Iannucci, J.E. Yoder | Conference Paper | 2020 |
| A Proposal for Securing Terrestrial Radio-Navigation Systems | R.X.T. Kor, P.A. Iannucci, L. Narula, T.E. Humphreys | Conference Paper | 2020 |
| Cross-Modal Localization: Using Automotive Radar for Absolute Geolocation within a Map Produced with Visible-Light Imagery | P.A. Iannucci, L. Narula, T.E. Humphreys | Conference Paper | 2020 |
| Economical Fused LEO GNSS | P.A. Iannucci, T.E. Humphreys | Conference Paper | 2020 |
| Intercepting Unmanned Aerial Vehicle Swarms with Neural-Network-Aided Game-Theoretic Target Assignment | N.G. Montalbano, T.E. Humphreys | Conference Paper | 2020 |
| Low SWaP-C Radar for Urban Air Mobility | W.A. Lies, L. Narula, P.A. Iannucci, T.E. Humphreys | Conference Paper | 2020 |
| Automotive-Radar-Based 50-cm Urban Positioning | L. Narula, P.A. Iannucci, T.E. Humphreys | Conference Paper | 2020 |
| TEX-CUP: The University of Texas Challenge for Urban Positioning | L. Narula, D.M. LaChapelle, M.J. Murrian, J.M. Wooten, T.E. Humphreys, E. de Toldi, G. Morvant, J-B Lacambre | Conference Paper | 2020 |
| Automotive Collision Risk Estimation Under Cooperative Sensing | D.M. LaChapelle, T.E. Humphreys, L. Narula, P.A. Iannucci, E. Moradi-Pari | Conference Paper | 2020 |
| Deep-Urban Unaided Precise Global Navigation Satellite System Vehicle Positioning | T.E. Humphreys, L. Narula, M.J. Murrian | Journal Paper | 2020 |
| Accuracy Limits for Globally-Referenced Digital Mapping Using Standard GNSS | L. Narula, M.J. Murrian, T.E. Humphreys | Conference Paper | 2018 |
| Accurate Collaborative Globally-Referenced Digital Mapping with Standard GNSS | L. Narula, J.M. Wooten, M.J. Murrian, D.M. LaChapelle, T.E. Humphreys | Journal Paper | 2018 |
| A Comparison of Methods for Online Lever Arm Estimation in GPS/INS Integration | N. Montalbano, T.E. Humphreys | Conference Paper | 2018 |
| Exploiting a Prior 3D Map for Object Recognition | S. Kaki, T.E. Humphreys, M. Akella | Undergraduate Honors Thesis | 2018 |
| Position Domain Integrity Analysis for Generalized Integer Aperture Bootstrapping | G.N. Green, T.E. Humphreys | Journal Paper | 2018 |
| Data-Driven Generalized Integer Aperture Bootstrapping for High-Integrity Positioning | G.N. Green, T.E. Humphreys | Journal Paper | 2018 |
| Low-cost Precise Vehicular Positioning in Urban Environments | T.E. Humphreys, M.J. Murrian, L. Narula | Conference Paper | 2018 |
| Advanced Techniques for Safety-of-Life Carrier Phase Differential GNSS Positioning with Applications to Triplex Architectures | G.N. Green | Ph.D. Dissertation | 2017 |
| Requirements for Secure Clock Synchronization | L. Narula, T.E. Humphreys | Journal Paper | 2018 |
| Assured Navigation and Timing | T. E. Humphreys | Presentation | 2017 |
| Robust Precise Location | T. E. Humphreys | Presentation | 2017 |
| Counter UAV Challenges | T. E. Humphreys | Presentation | 2017 |
| Exploiting antenna motion for faster initialization of centimeter-accurate GNSS positioning with low-cost antennas | K. M. Pesyna, Jr., T. Novlan, C. Zhang, R. W. Heath, Jr., and T. E. Humphreys | Journal Paper | 2017 |
| GNSS Signal Authentication via Power and Distortion Monitoring | K. D. Wesson, J. Gross, T. E. Humphreys, and B. L. Evans | Journal Paper | 2017 |
| Low-cost Precise Urban Positioning | T.E. Humphreys | Presentation | 2016 |
| Secure Perception in Connected Vehicles | T.E. Humphreys, L. Narula | Poster | 2016 |
| Dense RTK: Mass-Market Positioning for Automated Vehicles | T.E. Humphreys | Presentation | 2016 |
| Low-cost Precise Positioning for Automated Vehicles | M.J. Murrian, C.W. Gonzalez, T.E. Humphreys, K.M. Pesyna, Jr, D.P. Shepard, A.J. Kerns | Trade Magazine Article | 2016 |
| Attackers can spoof navigation signals without our knowledge. Here's how to fight back GPS lies | T.E. Humphreys, M.L. Psiaki, B. Stauffer | Magazine Article | 2016 |
| Data-Driven Generalized Integer Aperture Bootstrapping for Real-Time High Integrity Applications | G.N. Green, M. King, T.E. Humphreys | Conference Paper | 2016 |
| Requirements for Secure Wireless Time Transfer | L. Narula, T.E. Humphreys | Conference Paper | 2016 |
| On the Feasibility of cm-Accurate Positioning via a Smartphones Antenna and GNSS Chip | T.E. Humphreys, M.J. Murrian, F. van Diggelen, S. Podshivalov, K.M. Pesyna | Conference Paper | 2016 |
| A Dense Reference Network for Mass-Market Centimeter-Accurate Positioning | M.J. Murrian, C.W. Gonzalez, T.E. Humphreys | Conference Paper | 2016 |
| GNSS Spoofing and Detection | M.L. Psiaki, T.E. Humphreys | Journal Paper | 2016 |
| Sensor Deception Detection and Radio-Frequency Emitter Localization | J.A. Bhatti | Ph.D. Dissertation | 2015 |
| Advanced Techniques for Centimeter-Accurate GNSS Positioning on Low-Cost Mobile Platforms | K.M. Pesyna | Ph.D. Dissertation | 2015 |
| Fault Free Integrity of Mid-Level Voting for Triplex Differential GPS Solutions | G.N. Green, M. King, T.E. Humphreys | Conference Paper | 2015 |
| Toughening Techniques for GPS Receivers: Navigation Message Authentication | T.E. Humphreys | Presentation | 2015 |
| Statement on the Security Threat Posed by Unmanned Aerial Systems and Posssible Countermeasures | T.E. Humphreys | Testimony | 2015 |
| Accuracy in the Palm of Your Hand | K.M. Pesyna, R.W. Heath, T.E. Humphreys | Trade Magazine Article | 2015 |
| Development of a Micro-Mobility Analysis System Using Precise GPS Traces | S. Mukherji | Undergraduate Honors Thesis | 2014 |
| GNSS Security | T. Humphreys | Presentation | 2014 |
| Centimeter Positioning with a Smartphone-Quality GNSS Antenna | K.M. Pesyna, R.W. Heath, T.E. Humphreys | Conference Paper | 2014 |
| Adaptive Estimation of Signals of Opportunity | Z.M. Kassas, V. Ghadiok, T.E. Humphreys | Conference Paper | 2014 |
| GNSS Vulnerabilities and Threats | T. Humphreys | Presentation | 2014 |
| GNSS Spoofing Detection using Two-Antenna Differential Carrier Phase | M.L. Psiaki, B.W. O'Hanlon, S.P. Powell, J.A. Bhatti, K.D. Wesson, T.E. Humphreys, A. Schofield | Conference Paper | 2014 |
| A Testbed for Developing and Evaluating GNSS Authentication Techniques | T.E. Humphreys, J.A. Bhatti, D.P. Shepard, and K.D. Wesson | Conference Paper | 2014 |
| Secure Navigation and Timing Without Local Storage of Secret Keys | K. Wesson | Ph.D. Dissertation | 2014 |
| Ionospheric irregularities during a substorm event: Observations of ULF pulsations and GPS scintillations | H. Kim, C.R. Clauer, K. Deshpande, M.R. Lessard, A.T. Weatherwax, G.S. Bust, G. Crowley, T.E. Humphreys | Journal Paper | 2014 |
| High-Precision Globally-Referenced Position and Attitude via a Fusion of Visual SLAM, Carrier-Phase-Based GPS, and Inertial Measurements | D.P. Shepard and T.E. Humphreys | Conference Paper | 2014 |
| Analysis and Synthesis of Collaborative Opportunistic Navigation Systems | Z.M. Kassas | Ph.D. Dissertation | 2014 |
| Demonstration of a Space Capable Miniature Dual Frequency GNSS Receiver | E.G. Lightsey, T.E. Humphreys, J.A. Bhatti, A.J. Joplin, B.W. OHanlon, and S.P. Powell | Journal Paper | 2014 |
| Secure Perception for Autonomous Systems | T. Humphreys | Presentation | 2014 |
| A Blueprint for Civil GPS Navigation Message Authentication | A.J. Kerns, K.D. Wesson, and T.E. Humphreys | Conference Paper | 2014 |
| A Phase-Reconstruction Technique for Low-Power Centimeter-Accurate Mobile Positioning | K.M. Pesyna Jr., Z.M. Kassas, R.W. Heath Jr., T.E. Humphreys | Journal Paper | 2014 |
| Unmanned Aircraft Capture and Control via GPS Spoofing | A.J. Kerns, D.P. Shepard, J.A. Bhatti, T.E. Humphreys | Journal Paper | 2014 |
| Autonomous Adaptive Low-Power Instrument Platform (AAL-PIP) for remote high latitude geospace data collection | C.R. Clauer, H. Kim, K. Deshpande, Z. Xu, D. Weimer, S. Musko, G. Crowley, C. Fish, R. Nealy, T.E. Humphreys, J.A. Bhatti, A.J. Ridley | Journal Paper | 2014 |
| Receding Horizon Trajectory Optimization in Opportunistic Navigation Environments | Z.M. Kassas and T.E. Humphreys | Journal Paper | 2015 |
| Greedy Motion Planning for Simultaneous Signal Landscape Mapping and Receiver Localization | Z.M. Kassas, A. Arapostathis, and T.E. Humphreys | Journal Paper | 2015 |
| Hostile Control of Ships via False GPS Signals: Demonstration and Detection | J.A. Bhatti and T.E. Humphreys | Journal Paper | 2017 |
| Unhackable Drones: The Challenges of Securely Integrating Unmanned Aircraft into the National Airspace | K. Wesson and T. Humphreys | Magazine Article | 2013 |
| Real-Time GPS Spoofing Detection via Correlation of Encrypted Signals | B.W. O'Hanlon, M.L. Psiaki, J.A. Bhatti, D.P. Shepard, T.E. Humphreys | Journal Paper | 2013 |
| Secure PNT for Autonomous Systems | T. Humphreys | Presentation | 2013 |
| Precision Limits of Low-Energy GNSS Receivers | K.M. Pesyna, R.W. Heath, and T.E. Humphreys | Conference Paper | 2013 |
| Cost Analysis of Square Root Information Filtering and Smooting with Mixed Real-Integer State | K. Pesyna Jr and T. Humphreys | White Paper | 2013 |
| Achieving the Cramer-Rao Lower Bound in GPS Time-of-Arrival Estimation: A Frequency Domain Weighted Least-Squares Estimator Approach | K. Pesyna, T. Humphreys | White Paper | 2013 |
| Receding Horizon Trajectory Optimization for Simultaneous Signal Landscape Mapping and Receiver Localization | Z. Kassas, J. Bhatti, and T. Humphreys | Conference Paper | 2013 |
| Observability Analysis of Collaborative Opportunistic Navigation with Pseudorange Measurements | Z.M. Kassas and T.E. Humphreys | Journal Paper | 2013 |
| The Price of Anarchy in Active Signal Landscape Map Building | Z. Kassas, T. Humphreys | Conference Paper | 2013 |
| A Graphical Approach to GPS Software-Defined Receiver Implementation | Z. Kassas, J. Bhatti, T. Humphreys | Conference Paper | 2013 |
| A Combined Symmetric Difference and Power Monitoring GNSS Anti-Spoofing Technique | K. Wesson, B. L. Evans, and T. Humphreys | Conference Paper | 2013 |
| A Probabilistic Framework for Global Navigation Satellite System Signal Timing Assurance | K.D. Wesson, B.L. Evans, and T.E. Humphreys | Conference Paper | 2013 |
| GPS Spoofing & Implications for Telecom | K. Wesson | Presentation | 2013 |
| GPS Software-Defined Receiver and Radio Frequency Signal Landscape Simulator | Z. Kassas | Presentation | 2013 |
| Highlight: Collaborative Opportunistic Navigation | Z.M. Kassas | Magazine Article | 2013 |
| Motion Planning for Optimal Information Gathering in Opportunistic Navigation Systems | Z. Kassas and T. Humphreys | Conference Paper | 2013 |
| GPS Spoofing Detection via Dual-Receiver Correlation of Military Signals | Psiaki, M.L., B.W. O'Hanlon, J.A. Bhatti, D.P. Shepard, and T.E. Humphreys | Journal Paper | 2013 |
| Fusion of Carrier-Phase Differential GPS, Bundle-Adjustment-Based Visual SLAM, and Inertial Navigation for Precisely and Globally-Registered Augmented Reality | D. Shepard | Masters Thesis | 2013 |
| GPS Vulnerabilities and Implications for Telecom | T. Humphreys | Presentation | 2013 |
| Detection Strategy for Cryptographic GNSS Anti-Spoofing | Humphreys, T.E. | Journal Paper | 2013 |
| GAIN: Collaborative Opportunistic Navigation | Z. Kassas, T. Humphreys | Poster | 2013 |
| UAV Integration: Privacy and Security Hurdles | T. Humphreys | Presentation | 2013 |
| Extreme GPS: Limits of Security & Precision | T. Humphreys | Presentation | 2013 |
| Secure Navigation and Timing | T. Humphreys | Presentation | 2012 |
| Future Directions in GNSS Research | T. Humphreys | Presentation | 2012 |
| Initial GPS scintillation results from CASES receiver at South Pole, Antarctica | K.B. Deshpande, G. S. Bust, C. R. Clauer, H. Kim, J. E. Macon, T. E. Humphreys, J. A. Bhatti, S. B. Musko, G. Crowley, and A. T. Weatherwax | Journal Paper | 2012 |
| Evaluation of the Vulnerability of Phasor Measurement Units to GPS Spoofing Attacks | D.P. Shepard, T.E. Humphreys, A.A. Fansler | Journal Paper | 2012 |
| Position Paper: Secure Time Transfer for CPS | K.D. Wesson, T.E. Humphreys, and B.L. Evans | White Paper | 2012 |
| Probabilistic Secure Time Transfer: Challenges and Opportunities in a Sub-Millisecond World | K. Wesson, T. Humphreys, B. Evans | Presentation | 2012 |
| Statement on Privacy Issues Related to the Domestic Use of Unmanned Aerial Vehicles | T. Humphreys | Testimony | 2012 |
| The Texas Spoofing Test Battery: Toward a Standard for Evaluating GPS Signal Authentication Techniques | T.E. Humphreys, J.A. Bhatti, D.P. Shepard, and K.D. Wesson | Conference Paper | 2012 |
| Observability and Estimability of Collaborative Opportunistic Navigation with Pseudorange Measurements | Z.M. Kassas and T.E. Humphreys | Conference Paper | 2012 |
| Evaluation of Smart Grid and Civilian UAV Vulnerability to GPS Spoofing Attacks | D.P. Shepard, J.A. Bhatti, T.E. Humphreys, A.A. Fansler | Conference Paper | 2012 |
| Precise Augmented Reality Enabled by Carrier-Phase Differential GPS | D.P. Shepard, K.M. Pesyna, and T.E. Humphreys | Conference Paper | 2012 |
| Practical Cryptographic Civil GPS Signal Authentication | Wesson, K., M. Rothlisberger, and T. E. Humphreys | Journal Paper | 2012 |
| Going Up Against Time: The Power Grids Vulnerability to GPS Spoofing Attacks | D.P. Shepard, T.E. Humphreys, and A.Fansler | Trade Magazine Article | 2012 |
| Drone Hack: Spoofing Attack Demonstration on a Civilian Unmanned Aerial Vehicle | D.P. Shepard, J.A. Bhatti, and T.E. Humphreys | Trade Magazine Article | 2012 |
| Secure Civil Navigation and Timing | T. Humphreys | Presentation | 2012 |
| Statement on the Vulnerability of Civil Unmanned Aerial Vehicles and Other Systems to Civil GPS Spoofing | T. Humphreys | Testimony | 2012 |
| Observability Analysis of Opportunistic Navigation with Pseudorange Measurements | Z.M. Kassas and T.E. Humphreys | Conference Paper | 2012 |
| Constructing a Continuous Phase Time History from TDMA Signals for Opportunistic Navigation | K.M. Pesyna Jr., Z.M. Kassas, T.E. Humphreys | Conference Paper | 2012 |
| Development and Demonstration of a TDOA-Based GNSS Interference Signal Localization System | J.A. Bhatti, T.E. Humphreys, and B.M. Ledvina | Conference Paper | 2012 |
| Collaborative Opportunistic Navigation | Z. Kassas, K. Pesyna, T. Humphreys | Poster | 2012 |
| The GPS Dot and Its Discontents: Privacy vs. GNSS Integrity | T.E. Humphreys | Trade Magazine Article | 2012 |
| Evaluation of the Vulnerability of Phasor Measurement Units to GPS Spoofing Attacks | D.P. Shepard, T.E. Humphreys, and A.A. Fansler | Conference Paper | 2012 |
| Development and Testing of a Minaturized, Dual-Frequency GPS Receiver for Space Applications | Joplin, A.J., E.G. Lightsey, T.E. Humphreys | Conference Paper | 2012 |
| Straight Talk on Anti-Spoofing: Securing the Future of PNT | Wesson, K., D. Shepard, and T. Humphreys | Trade Magazine Article | 2012 |
| Know Your Enemy: Signal Characteristics of Civil GPS Jammers | Mitch, R.H., R.C. Dougherty, M.L. Psiaki, S.P. Powell, B.W. OHanlon, J.A. Bhatti, and T.E. Humphreys | Trade Magazine Article | 2012 |
| Development and Testing of a Miniaturized, Dual-Frequency, Software-Defined GPS Receiver for Space Applications | Joplin, A.J. | Masters Thesis | 2011 |
| A Collection of Observations and Advice on University Teaching | T.E. Humphreys | White Paper | 2011 |
| Radionavigation Robustness and Security | T. Humphreys | Presentation | 2011 |
| CubeSat-Sized GNSS Radio Occultation Experiments | T. Humphreys | Presentation | 2011 |
| GPS-assisted Femtocell Synchronization and Localization Through Tightly-Coupled Opportunistic Navigation | K. Pesyna, K. Wesson, R. Heath, T. Humphreys | Poster | 2011 |
| Tightly-Coupled Opportunistic Navigation for Deep Urban and Indoor Positioning | Pesyna, Jr., K.M., Z.M. Kassas, J.A. Bhatti, and T.E. Humphreys | Conference Paper | 2011 |
| Tightly-Coupled Opportunistic Navigation for Deep Urban and Indoor Positioning | Z. Kassas, K. Pesyna, J. Bhatti, T. Humphreys | Poster | 2011 |
| Characterization of Receiver Response to Spoofing Attacks | Shepard, D.P. and T.E. Humphreys | Conference Paper | 2011 |
| An Evaluation of the Vestigial Signal Defense for Civil GPS Anti-Spoofing | Wesson, K.D., D.P. Shepard, J.A. Bhatti, and T.E. Humphreys | Conference Paper | 2011 |
| A Proposed Navigation Message Authentication Implementation for Civil GPS Anti-Spoofing | Wesson, K.D., M.P. Rothlisberger, and T.E. Humphreys | Conference Paper | 2011 |
| Civilian GPS Spoofing Detection based on Dual-Receiver Correlation of Military Signals | Psiaki, M.L., B.W. O'Hanlon, J.A. Bhatti, D.P. Shepard, T.E. Humphreys | Conference Paper | 2011 |
| Signal Characteristics of Civil GPS Jammers | Mitch, R.H., R.C. Dougherty, M.L. Psiaki, S.P. Powell, B.W. O'Hanlon, J.A. Bhatti, and T.E. Humphreys | Conference Paper | 2011 |
| CASES: A Smart, Compact GPS Software Receiver for Space Weather Monitoring | O'Hanlon, B.W., M.L. Psiaki, S. Powell, J.A. Bhatti, T.E. Humphreys, G. Crowley, G.S. Bust | Conference Paper | 2011 |
| CASES: A Novel Low-Cost Ground-based Dual-Frequency GPS Software Receiver and Space Weather Monitor | Crowley, G., G.S. Bust, A.Reynolds, I.Azeem, R.Wilder, B.W. OHanlon, M.L. Psiaki, S.Powell, T.E. Humphreys, and J.A. Bhatti | Conference Paper | 2011 |
| Extending the Reach of GPS-assisted Femtocell Synchronization and Localization Through Tightly-Coupled Opportunistic Navigation | Pesyna, Jr., K. M., K. D. Wesson, R. W. Heath, Jr., T. E. Humphreys | Conference Paper | 2011 |
| GPS Spoofing and the Financial Sector | Humphreys, T.E. | White Paper | 2011 |
| Characterization of Receiver Response to Spoofing Attacks | D. Shepard | Undergraduate Honors Thesis | 2011 |
| State of the Art and Future Trends in Radionavigation | T. Humphreys | Presentation | 2011 |
| Indoor GPS: Tightly Coupled Opportunistic Navigation | K. Pesyna, K. Wesson, J. Bhatti, T. Humphreys | Poster | 2010 |
| GPS Spoofing Detection System | M. Psiaki, B. O'Hanlon, T. Humphreys, J. Bhatti | Poster | 2010 |
| Spoofing the Timing Signal: What Else is Vulnerable? | T. Humphreys | Presentation | 2010 |
| The GPS Assimilator: a Method for Upgrading Existing GPS User Equipment to Improve Accuracy, Robustness, and Resistance to Spoofing | Humphreys, T.E., J.A. Bhatti, B.M. Ledvina | Conference Paper | 2010 |
| Opportunistic Frequency Stability Transfer for Extending the Coherence Time of GNSS Receiver Clocks | Wesson, K.D., K.M. Pesyna, Jr., J.A. Bhatti, T.E. Humphreys | Conference Paper | 2010 |
| Advances in GNSS Equipment | T. Humphreys | Presentation | 2010 |
| GNSS Assimilator: A method for upgrading existing GNSS user equipment to improve accuracy, robustness, and resistance to spoofing | Humphreys, T.E., B.M. Ledvina | Trade Magazine Article | 2010 |
| Frontiers in Radionavigation | T. Humphreys | Presentation | 2010 |
| Radionavigation Integrity | T. Humphreys | Presentation | 2010 |
| Riding out the rough spots: Scintillation-robust GNSS carrier tracking | T. Humphreys | Presentation | 2010 |
| A data-driven testbed for evaluating GPS carrier tracking loops in ionospheric scintillation | Humphreys, T.E., M.L. Psiaki, B.M. Ledvina, A.P. Cerruti, and P.M. Kintner, Jr. | Journal Paper | 2010 |
| Modeling the effects of ionospheric scintillation on GPS carrier phase tracking | Humphreys, T.E., M.L. Psiaki, and P.M. Kintner, Jr. | Journal Paper | 2010 |
| Development and Field Testing of a DSP-Based Dual-Frequency Software GPS Receiver | OHanlon, B.W., M.L. Psiaki, P.M. Kintner, Jr., T.E. Humphreys | Conference Paper | 2009 |
| Receiver-Autonomous Spoofing Detection: Experimental Results of a Multi-antenna Receiver Defense Against a Portable Civil GPS Spoofer | Montgomery, P.Y., T.E. Humphreys, and B.M. Ledvina | Conference Paper | 2009 |
| Assessing the Civil GPS Spoofing Threat | T. Humphreys, J. Bhatti, B. Ledvina, M. Psiaki, B. O'Hanlon, P. Kintner, P. Montgomery | Presentation | 2009 |
| Exploiting Multicore Technology in Software-Defined GNSS Receivers | Humphreys, T.E., J.A. Bhatti, T. Pany, B.M. Ledvina, B.W. OHanlon | Journal Paper | |
| Simulating Ionosphere-Induced Scintillation for Testing GPS Receiver Phase Tracking Loops | Humphreys, T.E., M.L. Psiaki, J.C. Hinks, B.W. OHanlon and P.M. Kintner, Jr. | Journal Paper | 2009 |
| A Multi-Antenna Defense: Receiver-Autonomous GPS Spoofing Detection | Montgomery, P.Y., T.E. Humphreys, B.M. Ledvina | Trade Magazine Article | 2009 |
| GNSS and Ionospheric Scintillation: How to Survive the Next Solar Maximum | Kintner, Jr., P.M., T.E. Humphreys, J. Hinks | Trade Magazine Article | 2009 |
| Evaluating GPS Receiver Robustness to Ionospheric Scintillation | Hinks, J.C., T.E. Humphreys, B.W. O'Hanlon, M.L. Psiaki, P.M. Kintner, Jr. | Conference Paper | 2008 |
| Assessing the Spoofing Threat: Development of a Portable GPS Civilian Spoofer | Humphreys, T.E., B.M. Ledvina, M.L. Psiaki, B.W. O'Hanlon, P.M Kintner, Jr. | Conference Paper | 2008 |
| Considerations for Future IGS Receivers | Humphreys, T.E., L. Young, T. Pany | Conference Paper | 2008 |
| A Technique for Determining the Carrier Phase Differences between Independent GPS Receivers during Scintillation | Mohuiddin, S., T.E. Humphreys, M.L. Psiaki | Conference Paper | 2007 |
| Searching for Galileo | Psiaki, M.L., T.E. Humphreys, S. Mohiuddin, S.P. Powell, A.P. Cerruti, and P.M. Kintner, Jr. | Conference Paper | 2006 |
| GNSS Receiver Implementation on a DSP: Status, Challenges, and Prospects | Humphreys, T.E., M.L. Psiaki, P.M. Kintner, Jr., B.M. Ledvina | Conference Paper | 2006 |
| The Semidiurnal Variation in GPS-derived Zenith Neutral Delay | Humphreys, T.E., Kelly, M.C., Huber, N., Kintner, Jr., P.M. | Journal Paper | 2005 |
| GPS Carrier Tracking Loop Performance in the presence of Ionospheric Scintillations | Humphreys, T.E., M.L. Psiaki, P.M. Kintner, Jr., B.M. Ledvina | Conference Paper | 2005 |
| Magnetometer-based Attitude and Rate Estimation for a Spacecraft with Wire Booms | T.E. Humphreys, M.L. Psiaki, E.M. Klatt, S.P. Powell, P.M. Kintner, Jr. | Journal Paper | 2005 |
