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Publications

Hot Publications

  • GNSS Spoofing and Detection 
  • A Dense Reference Network for Mass-Market Centimeter-Accurate Positioning

Advanced Techniques for Safety-of-Life Carrier Phase Differential GNSS Positioning with Applications to Triplex Architectures Ph.D. DissertationG.N. Green2017
Requirements for Secure Clock Synchronization Journal PaperL. Narula, T.E. HumphreysUnder Review
Assured Navigation and Timing PresentationT. E. Humphreys2017
Robust Precise Location PresentationT. E. Humphreys2017
Counter UAV Challenges PresentationT. E. Humphreys2017
Exploiting antenna motion for faster initialization of centimeter-accurate GNSS positioning with low-cost antennas Journal PaperK. M. Pesyna, Jr., T. Novlan, C. Zhang, R. W. Heath, Jr., and T. E. Humphreys2017
GNSS Signal Authentication via Power and Distortion Monitoring Journal PaperK. D. Wesson, J. Gross, T. E. Humphreys, and B. L. EvansUnder Review
Low-cost Precise Urban Positioning PresentationT.E. Humphreys2016
Secure Perception in Connected Vehicles PosterT.E. Humphreys, L. Narula2016
Dense RTK: Mass-Market Positioning for Automated Vehicles PresentationT.E. Humphreys2016
Low-cost Precise Positioning for Automated Vehicles Trade Magazine ArticleM.J. Murrian, C.W. Gonzalez, T.E. Humphreys, K.M. Pesyna, Jr, D.P. Shepard, A.J. Kerns2016
Attackers can spoof navigation signals without our knowledge. Here's how to fight back GPS lies Magazine ArticleT.E. Humphreys, M.L. Psiaki, B. Stauffer2016
Data-Driven Generalized Integer Aperture Bootstrapping for Real-Time High Integrity Applications Conference PaperG.N. Green, M. King, T.E. Humphreys2016
Requirements for Secure Wireless Time Transfer Conference PaperL. Narula, T.E. Humphreys2016
On the Feasibility of cm-Accurate Positioning via a Smartphone’s Antenna and GNSS Chip Conference PaperT.E. Humphreys, M.J. Murrian, F. van Diggelen, S. Podshivalov, K.M. Pesyna2016
A Dense Reference Network for Mass-Market Centimeter-Accurate Positioning Conference PaperM.J. Murrian, C.W. Gonzalez, T.E. Humphreys2016
GNSS Spoofing and Detection Journal PaperM.L. Psiaki, T.E. Humphreys2016
Sensor Deception Detection and Radio-Frequency Emitter Localization Ph.D. DissertationJ.A. Bhatti2015
Advanced Techniques for Centimeter-Accurate GNSS Positioning on Low-Cost Mobile Platforms Ph.D. DissertationK.M. Pesyna2015
Fault Free Integrity of Mid-Level Voting for Triplex Differential GPS Solutions Conference PaperG.N. Green, M. King, T.E. Humphreys2015
Toughening Techniques for GPS Receivers: Navigation Message Authentication PresentationT.E. Humphreys2015
Statement on the Security Threat Posed by Unmanned Aerial Systems and Posssible Countermeasures TestimonyT.E. Humphreys2015
Accuracy in the Palm of Your Hand Trade Magazine ArticleK.M. Pesyna, R.W. Heath, T.E. Humphreys2015
Development of a Micro-Mobility Analysis System Using Precise GPS Traces Undergraduate Honors ThesisS. Mukherji2014
GNSS Security PresentationT. Humphreys2014
Centimeter Positioning with a Smartphone-Quality GNSS Antenna Conference PaperK.M. Pesyna, R.W. Heath, T.E. Humphreys2014
Adaptive Estimation of Signals of Opportunity Conference PaperZ.M. Kassas, V. Ghadiok, T.E. Humphreys2014
GNSS Vulnerabilities and Threats PresentationT. Humphreys2014
GNSS Spoofing Detection using Two-Antenna Differential Carrier Phase Conference PaperM.L. Psiaki, B.W. O'Hanlon, S.P. Powell, J.A. Bhatti, K.D. Wesson, T.E. Humphreys, A. Schofield2014
A Testbed for Developing and Evaluating GNSS Authentication Techniques Conference PaperT.E. Humphreys, J.A. Bhatti, D.P. Shepard, and K.D. Wesson2014
Secure Navigation and Timing Without Local Storage of Secret Keys Ph.D. DissertationK. Wesson2014
Ionospheric irregularities during a substorm event: Observations of ULF pulsations and GPS scintillations Journal PaperH. Kim, C.R. Clauer, K. Deshpande, M.R. Lessard, A.T. Weatherwax, G.S. Bust, G. Crowley, T.E. Humphreys2014
High-Precision Globally-Referenced Position and Attitude via a Fusion of Visual SLAM, Carrier-Phase-Based GPS, and Inertial Measurements Conference PaperD.P. Shepard and T.E. Humphreys2014
Analysis and Synthesis of Collaborative Opportunistic Navigation Systems Ph.D. DissertationZ.M. Kassas2014
Demonstration of a Space Capable Miniature Dual Frequency GNSS Receiver Journal PaperE.G. Lightsey, T.E. Humphreys, J.A. Bhatti, A.J. Joplin, B.W. O’Hanlon, and S.P. Powell2014
Secure Perception for Autonomous Systems PresentationT. Humphreys2014
A Blueprint for Civil GPS Navigation Message Authentication Conference PaperA.J. Kerns, K.D. Wesson, and T.E. Humphreys2014
A Phase-Reconstruction Technique for Low-Power Centimeter-Accurate Mobile Positioning Journal PaperK.M. Pesyna Jr., Z.M. Kassas, R.W. Heath Jr., T.E. Humphreys2014
Unmanned Aircraft Capture and Control via GPS Spoofing Journal PaperA.J. Kerns, D.P. Shepard, J.A. Bhatti, T.E. Humphreys2014
Autonomous Adaptive Low-Power Instrument Platform (AAL-PIP) for remote high latitude geospace data collection Journal PaperC.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. Ridley2014
Receding Horizon Trajectory Optimization in Opportunistic Navigation Environments Journal PaperZ.M. Kassas and T.E. Humphreys2015
Greedy Motion Planning for Simultaneous Signal Landscape Mapping and Receiver Localization Journal PaperZ.M. Kassas, A. Arapostathis, and T.E. Humphreys2015
Hostile Control of Ships via False GPS Signals: Demonstration and Detection Journal PaperJ.A. Bhatti and T.E. HumphreysTo Appear
Unhackable Drones: The Challenges of Securely Integrating Unmanned Aircraft into the National Airspace Magazine ArticleK. Wesson and T. Humphreys2013
Real-Time GPS Spoofing Detection via Correlation of Encrypted Signals Journal PaperB.W. O'Hanlon, M.L. Psiaki, J.A. Bhatti, D.P. Shepard, T.E. Humphreys2013
Secure PNT for Autonomous Systems PresentationT. Humphreys2013
Precision Limits of Low-Energy GNSS Receivers Conference PaperK.M. Pesyna, R.W. Heath, and T.E. Humphreys2013
Cost Analysis of Square Root Information Filtering and Smooting with Mixed Real-Integer State White PaperK. Pesyna Jr and T. Humphreys2013
Achieving the Cramer-Rao Lower Bound in GPS Time-of-Arrival Estimation: A Frequency Domain Weighted Least-Squares Estimator Approach White PaperK. Pesyna, T. Humphreys2013
Receding Horizon Trajectory Optimization for Simultaneous Signal Landscape Mapping and Receiver Localization Conference PaperZ. Kassas, J. Bhatti, and T. Humphreys2013
Observability Analysis of Collaborative Opportunistic Navigation with Pseudorange Measurements Journal PaperZ.M. Kassas and T.E. Humphreys2013
The Price of Anarchy in Active Signal Landscape Map Building Conference PaperZ. Kassas, T. Humphreys2013
A Graphical Approach to GPS Software-Defined Receiver Implementation Conference PaperZ. Kassas, J. Bhatti, T. Humphreys2013
A Combined Symmetric Difference and Power Monitoring GNSS Anti-Spoofing Technique Conference PaperK. Wesson, B. L. Evans, and T. Humphreys2013
A Probabilistic Framework for Global Navigation Satellite System Signal Timing Assurance Conference PaperK.D. Wesson, B.L. Evans, and T.E. Humphreys2013
GPS Spoofing & Implications for Telecom PresentationK. Wesson2013
GPS Software-Defined Receiver and Radio Frequency Signal Landscape Simulator PresentationZ. Kassas2013
Highlight: Collaborative Opportunistic Navigation Magazine ArticleZ.M. Kassas2013
Motion Planning for Optimal Information Gathering in Opportunistic Navigation Systems Conference PaperZ. Kassas and T. Humphreys2013
GPS Spoofing Detection via Dual-Receiver Correlation of Military Signals Journal PaperPsiaki, M.L., B.W. O'Hanlon, J.A. Bhatti, D.P. Shepard, and T.E. Humphreys2013
Fusion of Carrier-Phase Differential GPS, Bundle-Adjustment-Based Visual SLAM, and Inertial Navigation for Precisely and Globally-Registered Augmented Reality Masters ThesisD. Shepard2013
GPS Vulnerabilities and Implications for Telecom PresentationT. Humphreys2013
Detection Strategy for Cryptographic GNSS Anti-Spoofing Journal PaperHumphreys, T.E.2013
GAIN: Collaborative Opportunistic Navigation PosterZ. Kassas, T. Humphreys2013
UAV Integration: Privacy and Security Hurdles PresentationT. Humphreys2013
Extreme GPS: Limits of Security & Precision PresentationT. Humphreys2013
Secure Navigation and Timing PresentationT. Humphreys2012
Future Directions in GNSS Research PresentationT. Humphreys2012
Initial GPS scintillation results from CASES receiver at South Pole, Antarctica Journal PaperK.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. Weatherwax2012
Evaluation of the Vulnerability of Phasor Measurement Units to GPS Spoofing Attacks Journal PaperD.P. Shepard, T.E. Humphreys, A.A. Fansler2012
Position Paper: Secure Time Transfer for CPS White PaperK.D. Wesson, T.E. Humphreys, and B.L. Evans2012
Probabilistic Secure Time Transfer: Challenges and Opportunities in a Sub-Millisecond World PresentationK. Wesson, T. Humphreys, B. Evans2012
Statement on Privacy Issues Related to the Domestic Use of Unmanned Aerial Vehicles TestimonyT. Humphreys2012
The Texas Spoofing Test Battery: Toward a Standard for Evaluating GPS Signal Authentication Techniques Conference PaperT.E. Humphreys, J.A. Bhatti, D.P. Shepard, and K.D. Wesson2012
Observability and Estimability of Collaborative Opportunistic Navigation with Pseudorange Measurements Conference PaperZ.M. Kassas and T.E. Humphreys2012
Evaluation of Smart Grid and Civilian UAV Vulnerability to GPS Spoofing Attacks Conference PaperD.P. Shepard, J.A. Bhatti, T.E. Humphreys, A.A. Fansler2012
Precise Augmented Reality Enabled by Carrier-Phase Differential GPS Conference PaperD.P. Shepard, K.M. Pesyna, and T.E. Humphreys2012
Practical Cryptographic Civil GPS Signal Authentication Journal PaperWesson, K., M. Rothlisberger, and T. E. Humphreys2012
Going Up Against Time: The Power Grid’s Vulnerability to GPS Spoofing Attacks Trade Magazine ArticleD.P. Shepard, T.E. Humphreys, and A.Fansler2012
Drone Hack: Spoofing Attack Demonstration on a Civilian Unmanned Aerial Vehicle Trade Magazine ArticleD.P. Shepard, J.A. Bhatti, and T.E. Humphreys2012
Secure Civil Navigation and Timing PresentationT. Humphreys2012
Statement on the Vulnerability of Civil Unmanned Aerial Vehicles and Other Systems to Civil GPS Spoofing TestimonyT. Humphreys2012
Observability Analysis of Opportunistic Navigation with Pseudorange Measurements Conference PaperZ.M. Kassas and T.E. Humphreys2012
Constructing a Continuous Phase Time History from TDMA Signals for Opportunistic Navigation Conference PaperK.M. Pesyna Jr.,  Z.M. Kassas, T.E. Humphreys2012
Development and Demonstration of a TDOA-Based GNSS Interference Signal Localization System Conference PaperJ.A. Bhatti, T.E. Humphreys, and B.M. Ledvina2012
Collaborative Opportunistic Navigation PosterZ. Kassas, K. Pesyna, T. Humphreys2012
The GPS Dot and Its Discontents: Privacy vs. GNSS Integrity Trade Magazine ArticleT.E. Humphreys2012
Evaluation of the Vulnerability of Phasor Measurement Units to GPS Spoofing Attacks Conference PaperD.P. Shepard, T.E. Humphreys, and A.A. Fansler2012
Development and Testing of a Minaturized, Dual-Frequency GPS Receiver for Space Applications Conference PaperJoplin, A.J., E.G. Lightsey, T.E. Humphreys2012
Straight Talk on Anti-Spoofing: Securing the Future of PNT Trade Magazine ArticleWesson, K., D. Shepard, and T. Humphreys2012
Know Your Enemy: Signal Characteristics of Civil GPS Jammers Trade Magazine ArticleMitch, R.H., R.C. Dougherty, M.L. Psiaki, S.P. Powell, B.W. O’Hanlon, J.A. Bhatti, and T.E. Humphreys2012
Development and Testing of a Miniaturized, Dual-Frequency, Software-Defined GPS Receiver for Space Applications Masters ThesisJoplin, A.J.2011
A Collection of Observations and Advice on University Teaching White PaperT.E. Humphreys2011
Radionavigation Robustness and Security PresentationT. Humphreys2011
CubeSat-Sized GNSS Radio Occultation Experiments PresentationT. Humphreys2011
GPS-assisted Femtocell Synchronization and Localization Through Tightly-Coupled Opportunistic Navigation PosterK. Pesyna, K. Wesson, R. Heath, T. Humphreys2011
Tightly-Coupled Opportunistic Navigation for Deep Urban and Indoor Positioning Conference PaperPesyna, Jr., K.M., Z.M. Kassas, J.A. Bhatti, and T.E. Humphreys2011
Tightly-Coupled Opportunistic Navigation for Deep Urban and Indoor Positioning PosterZ. Kassas, K. Pesyna, J. Bhatti, T. Humphreys2011
Characterization of Receiver Response to Spoofing Attacks Conference PaperShepard, D.P. and T.E. Humphreys2011
An Evaluation of the Vestigial Signal Defense for Civil GPS Anti-Spoofing Conference PaperWesson, K.D., D.P. Shepard, J.A. Bhatti, and T.E. Humphreys2011
A Proposed Navigation Message Authentication Implementation for Civil GPS Anti-Spoofing Conference PaperWesson, K.D., M.P. Rothlisberger, and T.E. Humphreys2011
Civilian GPS Spoofing Detection based on Dual-Receiver Correlation of Military Signals Conference PaperPsiaki, M.L., B.W. O'Hanlon, J.A. Bhatti, D.P. Shepard, T.E. Humphreys2011
Signal Characteristics of Civil GPS Jammers Conference PaperMitch, R.H., R.C. Dougherty, M.L. Psiaki, S.P. Powell, B.W. O'Hanlon, J.A. Bhatti, and T.E. Humphreys2011
CASES: A Smart, Compact GPS Software Receiver for Space Weather Monitoring Conference PaperO'Hanlon, B.W., M.L. Psiaki, S. Powell, J.A. Bhatti, T.E. Humphreys, G. Crowley, G.S. Bust2011
CASES: A Novel Low-Cost Ground-based Dual-Frequency GPS Software Receiver and Space Weather Monitor Conference PaperCrowley, G., G.S. Bust, A.Reynolds, I.Azeem, R.Wilder, B.W. O’Hanlon, M.L. Psiaki, S.Powell, T.E. Humphreys, and J.A. Bhatti2011
Extending the Reach of GPS-assisted Femtocell Synchronization and Localization Through Tightly-Coupled Opportunistic Navigation Conference PaperPesyna, Jr., K. M., K. D. Wesson, R. W. Heath, Jr., T. E. Humphreys2011
GPS Spoofing and the Financial Sector White PaperHumphreys, T.E.2011
Characterization of Receiver Response to Spoofing Attacks Undergraduate Honors ThesisD. Shepard2011
State of the Art and Future Trends in Radionavigation PresentationT. Humphreys2011
Indoor GPS: Tightly Coupled Opportunistic Navigation PosterK. Pesyna, K. Wesson, J. Bhatti, T. Humphreys2010
GPS Spoofing Detection System PosterM. Psiaki, B. O'Hanlon, T. Humphreys, J. Bhatti2010
Spoofing the Timing Signal: What Else is Vulnerable? PresentationT. Humphreys2010
The GPS Assimilator: a Method for Upgrading Existing GPS User Equipment to Improve Accuracy, Robustness, and Resistance to Spoofing Conference PaperHumphreys, T.E., J.A. Bhatti, B.M. Ledvina2010
Opportunistic Frequency Stability Transfer for Extending the Coherence Time of GNSS Receiver Clocks Conference PaperWesson, K.D., K.M. Pesyna, Jr., J.A. Bhatti, T.E. Humphreys2010
Advances in GNSS Equipment PresentationT. Humphreys2010
GNSS Assimilator: A method for upgrading existing GNSS user equipment to improve accuracy, robustness, and resistance to spoofing Trade Magazine ArticleHumphreys, T.E., B.M. Ledvina2010
Frontiers in Radionavigation PresentationT. Humphreys2010
Radionavigation Integrity PresentationT. Humphreys2010
Riding out the rough spots: Scintillation-robust GNSS carrier tracking PresentationT. Humphreys2010
A data-driven testbed for evaluating GPS carrier tracking loops in ionospheric scintillation Journal PaperHumphreys, T.E., M.L. Psiaki, B.M. Ledvina, A.P. Cerruti, and P.M. Kintner, Jr.2010
Modeling the effects of ionospheric scintillation on GPS carrier phase tracking Journal PaperHumphreys, T.E., M.L. Psiaki, and P.M. Kintner, Jr.2010
Development and Field Testing of a DSP-Based Dual-Frequency Software GPS Receiver Conference PaperO’Hanlon, B.W., M.L. Psiaki, P.M. Kintner, Jr., T.E. Humphreys2009
Receiver-Autonomous Spoofing Detection: Experimental Results of a Multi-antenna Receiver Defense Against a Portable Civil GPS Spoofer Conference PaperMontgomery, P.Y., T.E. Humphreys, and B.M. Ledvina2009
Assessing the Civil GPS Spoofing Threat PresentationT. Humphreys, J. Bhatti, B. Ledvina, M. Psiaki, B. O'Hanlon, P. Kintner, P. Montgomery2009
Exploiting Multicore Technology in Software-Defined GNSS Receivers Journal PaperHumphreys, T.E., J.A. Bhatti, T. Pany, B.M. Ledvina, B.W. O’Hanlon
Simulating Ionosphere-Induced Scintillation for Testing GPS Receiver Phase Tracking Loops Journal PaperHumphreys, T.E., M.L. Psiaki, J.C. Hinks, B.W. O’Hanlon and P.M. Kintner, Jr.2009
A Multi-Antenna Defense: Receiver-Autonomous GPS Spoofing Detection Trade Magazine ArticleMontgomery, P.Y., T.E. Humphreys, B.M. Ledvina2009
GNSS and Ionospheric Scintillation: How to Survive the Next Solar Maximum Trade Magazine ArticleKintner, Jr., P.M., T.E. Humphreys, J. Hinks2009
Evaluating GPS Receiver Robustness to Ionospheric Scintillation Conference PaperHinks, J.C., T.E. Humphreys, B.W. O'Hanlon, M.L. Psiaki, P.M. Kintner, Jr.2008
Assessing the Spoofing Threat: Development of a Portable GPS Civilian Spoofer Conference PaperHumphreys, T.E., B.M. Ledvina, M.L. Psiaki, B.W. O'Hanlon, P.M Kintner, Jr.2008
Considerations for Future IGS Receivers Conference PaperHumphreys, T.E., L. Young, T. Pany2008
A Technique for Determining the Carrier Phase Differences between Independent GPS Receivers during Scintillation Conference PaperMohuiddin, S., T.E. Humphreys, M.L. Psiaki2007
Searching for Galileo Conference PaperPsiaki, M.L., T.E. Humphreys, S. Mohiuddin, S.P. Powell, A.P. Cerruti, and P.M. Kintner, Jr.2006
GNSS Receiver Implementation on a DSP: Status, Challenges, and Prospects Conference PaperHumphreys, T.E., M.L. Psiaki, P.M. Kintner, Jr., B.M. Ledvina2006
The Semidiurnal Variation in GPS-derived Zenith Neutral Delay Journal PaperHumphreys, T.E., Kelly, M.C., Huber, N., Kintner, Jr., P.M.2005
GPS Carrier Tracking Loop Performance in the presence of Ionospheric Scintillations Conference PaperHumphreys, T.E., M.L. Psiaki, P.M. Kintner, Jr., B.M. Ledvina2005
Magnetometer-based Attitude and Rate Estimation for a Spacecraft with Wire Booms Journal PaperT.E. Humphreys, M.L. Psiaki, E.M. Klatt, S.P. Powell, P.M. Kintner, Jr.2005
Analysis of Ionospheric Scintillations using Wideband GPS L1 C/A Signal Data Conference PaperHumphreys, T.E., Ledvina, B.M., Psiaki, M.L., Kintner, Jr., P.M.2004

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