Advanced Techniques for Safety-of-Life Carrier Phase Differential GNSS Positioning with Applications to Triplex Architectures
|
Ph.D. Dissertation | G.N. Green | 2017
|
Requirements for Secure Clock Synchronization
|
Journal Paper | L. Narula, T.E. Humphreys | Under Review
|
Assured Navigation and Timing
|
Presentation | T. E. Humphreys | 2017
|
Robust Precise Location
|
Presentation | T. E. Humphreys | 2017
|
Counter UAV Challenges
|
Presentation | T. E. Humphreys | 2017
|
Exploiting antenna motion for faster initialization of centimeter-accurate GNSS positioning with low-cost antennas
|
Journal Paper | K. M. Pesyna, Jr., T. Novlan, C. Zhang, R. W. Heath, Jr., and T. E. Humphreys | 2017
|
GNSS Signal Authentication via Power and Distortion Monitoring
|
Journal Paper | K. D. Wesson, J. Gross, T. E. Humphreys, and B. L. Evans | Under Review
|
Low-cost Precise Urban Positioning
|
Presentation | T.E. Humphreys | 2016
|
Secure Perception in Connected Vehicles
|
Poster | T.E. Humphreys, L. Narula | 2016
|
Dense RTK: Mass-Market Positioning for Automated Vehicles
|
Presentation | T.E. Humphreys | 2016
|
Low-cost Precise Positioning for Automated Vehicles
|
Trade Magazine Article | M.J. Murrian, C.W. Gonzalez, T.E. Humphreys, K.M. Pesyna, Jr, D.P. Shepard, A.J. Kerns | 2016
|
Attackers can spoof navigation signals without our knowledge. Here's how to fight back GPS lies
|
Magazine Article | T.E. Humphreys, M.L. Psiaki, B. Stauffer | 2016
|
Data-Driven Generalized Integer Aperture Bootstrapping for Real-Time High Integrity Applications
|
Conference Paper | G.N. Green, M. King, T.E. Humphreys | 2016
|
Requirements for Secure Wireless Time Transfer
|
Conference Paper | L. Narula, T.E. Humphreys | 2016
|
On the Feasibility of cm-Accurate Positioning via a Smartphone’s Antenna and GNSS Chip
|
Conference Paper | T.E. Humphreys, M.J. Murrian, F. van Diggelen, S. Podshivalov, K.M. Pesyna | 2016
|
A Dense Reference Network for Mass-Market Centimeter-Accurate Positioning
|
Conference Paper | M.J. Murrian, C.W. Gonzalez, T.E. Humphreys | 2016
|
GNSS Spoofing and Detection
|
Journal Paper | M.L. Psiaki, T.E. Humphreys | 2016
|
Sensor Deception Detection and Radio-Frequency Emitter Localization
|
Ph.D. Dissertation | J.A. Bhatti | 2015
|
Advanced Techniques for Centimeter-Accurate GNSS Positioning on Low-Cost Mobile Platforms
|
Ph.D. Dissertation | K.M. Pesyna | 2015
|
Fault Free Integrity of Mid-Level Voting for Triplex Differential GPS Solutions
|
Conference Paper | G.N. Green, M. King, T.E. Humphreys | 2015
|
Toughening Techniques for GPS Receivers: Navigation Message Authentication
|
Presentation | T.E. Humphreys | 2015
|
Statement on the Security Threat Posed by Unmanned Aerial Systems and Posssible Countermeasures
|
Testimony | T.E. Humphreys | 2015
|
Accuracy in the Palm of Your Hand
|
Trade Magazine Article | K.M. Pesyna, R.W. Heath, T.E. Humphreys | 2015
|
Development of a Micro-Mobility Analysis System Using Precise GPS Traces
|
Undergraduate Honors Thesis | S. Mukherji | 2014
|
GNSS Security
|
Presentation | T. Humphreys | 2014
|
Centimeter Positioning with a Smartphone-Quality GNSS Antenna
|
Conference Paper | K.M. Pesyna, R.W. Heath, T.E. Humphreys | 2014
|
Adaptive Estimation of Signals of Opportunity
|
Conference Paper | Z.M. Kassas, V. Ghadiok, T.E. Humphreys | 2014
|
GNSS Vulnerabilities and Threats
|
Presentation | T. Humphreys | 2014
|
GNSS Spoofing Detection using Two-Antenna Differential Carrier Phase
|
Conference Paper | M.L. Psiaki, B.W. O'Hanlon, S.P. Powell, J.A. Bhatti, K.D. Wesson, T.E. Humphreys, A. Schofield | 2014
|
A Testbed for Developing and Evaluating GNSS Authentication Techniques
|
Conference Paper | T.E. Humphreys, J.A. Bhatti, D.P. Shepard, and K.D. Wesson | 2014
|
Secure Navigation and Timing Without Local Storage of Secret Keys
|
Ph.D. Dissertation | K. Wesson | 2014
|
Ionospheric irregularities during a substorm event: Observations of ULF pulsations and GPS scintillations
|
Journal Paper | H. Kim, C.R. Clauer, K. Deshpande, M.R. Lessard, A.T. Weatherwax, G.S. Bust, G. Crowley, T.E. Humphreys | 2014
|
High-Precision Globally-Referenced Position and Attitude via a Fusion of Visual SLAM, Carrier-Phase-Based GPS, and Inertial Measurements
|
Conference Paper | D.P. Shepard and T.E. Humphreys | 2014
|
Analysis and Synthesis of Collaborative Opportunistic Navigation Systems
|
Ph.D. Dissertation | Z.M. Kassas | 2014
|
Demonstration of a Space Capable Miniature Dual Frequency GNSS Receiver
|
Journal Paper | E.G. Lightsey, T.E. Humphreys, J.A. Bhatti, A.J. Joplin, B.W. O’Hanlon, and S.P. Powell | 2014
|
Secure Perception for Autonomous Systems
|
Presentation | T. Humphreys | 2014
|
A Blueprint for Civil GPS Navigation Message Authentication
|
Conference Paper | A.J. Kerns, K.D. Wesson, and T.E. Humphreys | 2014
|
A Phase-Reconstruction Technique for Low-Power Centimeter-Accurate Mobile Positioning
|
Journal Paper | K.M. Pesyna Jr., Z.M. Kassas, R.W. Heath Jr., T.E. Humphreys | 2014
|
Unmanned Aircraft Capture and Control via GPS Spoofing
|
Journal Paper | A.J. Kerns, D.P. Shepard, J.A. Bhatti, T.E. Humphreys | 2014
|
Autonomous Adaptive Low-Power Instrument Platform (AAL-PIP) for remote high latitude geospace data collection
|
Journal Paper | 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 | 2014
|
Receding Horizon Trajectory Optimization in Opportunistic Navigation Environments
|
Journal Paper | Z.M. Kassas and T.E. Humphreys | 2015
|
Greedy Motion Planning for Simultaneous Signal Landscape Mapping and Receiver Localization
|
Journal Paper | Z.M. Kassas, A. Arapostathis, and T.E. Humphreys | 2015
|
Hostile Control of Ships via False GPS Signals: Demonstration and Detection
|
Journal Paper | J.A. Bhatti and T.E. Humphreys | To Appear
|
Unhackable Drones: The Challenges of Securely Integrating Unmanned Aircraft into the National Airspace
|
Magazine Article | K. Wesson and T. Humphreys | 2013
|
Real-Time GPS Spoofing Detection via Correlation of Encrypted Signals
|
Journal Paper | B.W. O'Hanlon, M.L. Psiaki, J.A. Bhatti, D.P. Shepard, T.E. Humphreys | 2013
|
Secure PNT for Autonomous Systems
|
Presentation | T. Humphreys | 2013
|
Precision Limits of Low-Energy GNSS Receivers
|
Conference Paper | K.M. Pesyna, R.W. Heath, and T.E. Humphreys | 2013
|
Cost Analysis of Square Root Information Filtering and Smooting with Mixed Real-Integer State
|
White Paper | K. Pesyna Jr and T. Humphreys | 2013
|
Achieving the Cramer-Rao Lower Bound in GPS Time-of-Arrival Estimation: A Frequency Domain Weighted Least-Squares Estimator Approach
|
White Paper | K. Pesyna, T. Humphreys | 2013
|
Receding Horizon Trajectory Optimization for Simultaneous Signal Landscape Mapping and Receiver Localization
|
Conference Paper | Z. Kassas, J. Bhatti, and T. Humphreys | 2013
|
Observability Analysis of Collaborative Opportunistic Navigation with Pseudorange Measurements
|
Journal Paper | Z.M. Kassas and T.E. Humphreys | 2013
|
The Price of Anarchy in Active Signal Landscape Map Building
|
Conference Paper | Z. Kassas, T. Humphreys | 2013
|
A Graphical Approach to GPS Software-Defined Receiver Implementation
|
Conference Paper | Z. Kassas, J. Bhatti, T. Humphreys | 2013
|
A Combined Symmetric Difference and Power Monitoring GNSS Anti-Spoofing Technique
|
Conference Paper | K. Wesson, B. L. Evans, and T. Humphreys | 2013
|
A Probabilistic Framework for Global Navigation Satellite System Signal Timing Assurance
|
Conference Paper | K.D. Wesson, B.L. Evans, and T.E. Humphreys | 2013
|
GPS Spoofing & Implications for Telecom
|
Presentation | K. Wesson | 2013
|
GPS Software-Defined Receiver and Radio Frequency Signal Landscape Simulator
|
Presentation | Z. Kassas | 2013
|
Highlight: Collaborative Opportunistic Navigation
|
Magazine Article | Z.M. Kassas | 2013
|
Motion Planning for Optimal Information Gathering in Opportunistic Navigation Systems
|
Conference Paper | Z. Kassas and T. Humphreys | 2013
|
GPS Spoofing Detection via Dual-Receiver Correlation of Military Signals
|
Journal Paper | Psiaki, M.L., B.W. O'Hanlon, J.A. Bhatti, D.P. Shepard, and T.E. Humphreys | 2013
|
Fusion of Carrier-Phase Differential GPS, Bundle-Adjustment-Based Visual SLAM, and Inertial Navigation for Precisely and Globally-Registered Augmented Reality
|
Masters Thesis | D. Shepard | 2013
|
GPS Vulnerabilities and Implications for Telecom
|
Presentation | T. Humphreys | 2013
|
Detection Strategy for Cryptographic GNSS Anti-Spoofing
|
Journal Paper | Humphreys, T.E. | 2013
|
GAIN: Collaborative Opportunistic Navigation
|
Poster | Z. Kassas, T. Humphreys | 2013
|
UAV Integration: Privacy and Security Hurdles
|
Presentation | T. Humphreys | 2013
|
Extreme GPS: Limits of Security & Precision
|
Presentation | T. Humphreys | 2013
|
Secure Navigation and Timing
|
Presentation | T. Humphreys | 2012
|
Future Directions in GNSS Research
|
Presentation | T. Humphreys | 2012
|
Initial GPS scintillation results from CASES receiver at South Pole, Antarctica
|
Journal Paper | 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 | 2012
|
Evaluation of the Vulnerability of Phasor Measurement Units to GPS Spoofing Attacks
|
Journal Paper | D.P. Shepard, T.E. Humphreys, A.A. Fansler | 2012
|
Position Paper: Secure Time Transfer for CPS
|
White Paper | K.D. Wesson, T.E. Humphreys, and B.L. Evans | 2012
|
Probabilistic Secure Time Transfer: Challenges and Opportunities in a Sub-Millisecond World
|
Presentation | K. Wesson, T. Humphreys, B. Evans | 2012
|
Statement on Privacy Issues Related to the Domestic Use of Unmanned Aerial Vehicles
|
Testimony | T. Humphreys | 2012
|
The Texas Spoofing Test Battery: Toward a Standard for Evaluating GPS Signal Authentication Techniques
|
Conference Paper | T.E. Humphreys, J.A. Bhatti, D.P. Shepard, and K.D. Wesson | 2012
|
Observability and Estimability of Collaborative Opportunistic Navigation with Pseudorange Measurements
|
Conference Paper | Z.M. Kassas and T.E. Humphreys | 2012
|
Evaluation of Smart Grid and Civilian UAV Vulnerability to GPS Spoofing Attacks
|
Conference Paper | D.P. Shepard, J.A. Bhatti, T.E. Humphreys, A.A. Fansler | 2012
|
Precise Augmented Reality Enabled by Carrier-Phase Differential GPS
|
Conference Paper | D.P. Shepard, K.M. Pesyna, and T.E. Humphreys | 2012
|
Practical Cryptographic Civil GPS Signal Authentication
|
Journal Paper | Wesson, K., M. Rothlisberger, and T. E. Humphreys | 2012
|
Going Up Against Time: The Power Grid’s Vulnerability to GPS Spoofing Attacks
|
Trade Magazine Article | D.P. Shepard, T.E. Humphreys, and A.Fansler | 2012
|
Drone Hack: Spoofing Attack Demonstration on a Civilian Unmanned Aerial Vehicle
|
Trade Magazine Article | D.P. Shepard, J.A. Bhatti, and T.E. Humphreys | 2012
|
Secure Civil Navigation and Timing
|
Presentation | T. Humphreys | 2012
|
Statement on the Vulnerability of Civil Unmanned Aerial Vehicles and Other Systems to Civil GPS Spoofing
|
Testimony | T. Humphreys | 2012
|
Observability Analysis of Opportunistic Navigation with Pseudorange Measurements
|
Conference Paper | Z.M. Kassas and T.E. Humphreys | 2012
|
Constructing a Continuous Phase Time History from TDMA Signals for Opportunistic Navigation
|
Conference Paper | K.M. Pesyna Jr., Z.M. Kassas, T.E. Humphreys | 2012
|
Development and Demonstration of a TDOA-Based GNSS Interference Signal Localization System
|
Conference Paper | J.A. Bhatti, T.E. Humphreys, and B.M. Ledvina | 2012
|
Collaborative Opportunistic Navigation
|
Poster | Z. Kassas, K. Pesyna, T. Humphreys | 2012
|
The GPS Dot and Its Discontents: Privacy vs. GNSS Integrity
|
Trade Magazine Article | T.E. Humphreys | 2012
|
Evaluation of the Vulnerability of Phasor Measurement Units to GPS Spoofing Attacks
|
Conference Paper | D.P. Shepard, T.E. Humphreys, and A.A. Fansler | 2012
|
Development and Testing of a Minaturized, Dual-Frequency GPS Receiver for Space Applications
|
Conference Paper | Joplin, A.J., E.G. Lightsey, T.E. Humphreys | 2012
|
Straight Talk on Anti-Spoofing: Securing the Future of PNT
|
Trade Magazine Article | Wesson, K., D. Shepard, and T. Humphreys | 2012
|
Know Your Enemy: Signal Characteristics of Civil GPS Jammers
|
Trade Magazine Article | Mitch, R.H., R.C. Dougherty, M.L. Psiaki, S.P. Powell, B.W. O’Hanlon, J.A. Bhatti, and T.E. Humphreys | 2012
|
Development and Testing of a Miniaturized, Dual-Frequency, Software-Defined GPS Receiver for Space Applications
|
Masters Thesis | Joplin, A.J. | 2011
|
A Collection of Observations and Advice on University Teaching
|
White Paper | T.E. Humphreys | 2011
|
Radionavigation Robustness and Security
|
Presentation | T. Humphreys | 2011
|
CubeSat-Sized GNSS Radio Occultation Experiments
|
Presentation | T. Humphreys | 2011
|
GPS-assisted Femtocell Synchronization and Localization Through Tightly-Coupled Opportunistic Navigation
|
Poster | K. Pesyna, K. Wesson, R. Heath, T. Humphreys | 2011
|
Tightly-Coupled Opportunistic Navigation for Deep Urban and Indoor Positioning
|
Conference Paper | Pesyna, Jr., K.M., Z.M. Kassas, J.A. Bhatti, and T.E. Humphreys | 2011
|
Tightly-Coupled Opportunistic Navigation for Deep Urban and Indoor Positioning
|
Poster | Z. Kassas, K. Pesyna, J. Bhatti, T. Humphreys | 2011
|
Characterization of Receiver Response to Spoofing Attacks
|
Conference Paper | Shepard, D.P. and T.E. Humphreys | 2011
|
An Evaluation of the Vestigial Signal Defense for Civil GPS Anti-Spoofing
|
Conference Paper | Wesson, K.D., D.P. Shepard, J.A. Bhatti, and T.E. Humphreys | 2011
|
A Proposed Navigation Message Authentication Implementation for Civil GPS Anti-Spoofing
|
Conference Paper | Wesson, K.D., M.P. Rothlisberger, and T.E. Humphreys | 2011
|
Civilian GPS Spoofing Detection based on Dual-Receiver Correlation of Military Signals
|
Conference Paper | Psiaki, M.L., B.W. O'Hanlon, J.A. Bhatti, D.P. Shepard, T.E. Humphreys | 2011
|
Signal Characteristics of Civil GPS Jammers
|
Conference Paper | Mitch, R.H., R.C. Dougherty, M.L. Psiaki, S.P. Powell, B.W. O'Hanlon, J.A. Bhatti, and T.E. Humphreys | 2011
|
CASES: A Smart, Compact GPS Software Receiver for Space Weather Monitoring
|
Conference Paper | O'Hanlon, B.W., M.L. Psiaki, S. Powell, J.A. Bhatti, T.E. Humphreys, G. Crowley, G.S. Bust | 2011
|
CASES: A Novel Low-Cost Ground-based Dual-Frequency GPS Software Receiver and Space Weather Monitor
|
Conference Paper | Crowley, 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. Bhatti | 2011
|
Extending the Reach of GPS-assisted Femtocell Synchronization and Localization Through Tightly-Coupled Opportunistic Navigation
|
Conference Paper | Pesyna, Jr., K. M., K. D. Wesson, R. W. Heath, Jr., T. E. Humphreys | 2011
|
GPS Spoofing and the Financial Sector
|
White Paper | Humphreys, T.E. | 2011
|
Characterization of Receiver Response to Spoofing Attacks
|
Undergraduate Honors Thesis | D. Shepard | 2011
|
State of the Art and Future Trends in Radionavigation
|
Presentation | T. Humphreys | 2011
|
Indoor GPS: Tightly Coupled Opportunistic Navigation
|
Poster | K. Pesyna, K. Wesson, J. Bhatti, T. Humphreys | 2010
|
GPS Spoofing Detection System
|
Poster | M. Psiaki, B. O'Hanlon, T. Humphreys, J. Bhatti | 2010
|
Spoofing the Timing Signal: What Else is Vulnerable?
|
Presentation | T. Humphreys | 2010
|
The GPS Assimilator: a Method for Upgrading Existing GPS User Equipment to Improve Accuracy, Robustness, and Resistance to Spoofing
|
Conference Paper | Humphreys, T.E., J.A. Bhatti, B.M. Ledvina | 2010
|
Opportunistic Frequency Stability Transfer for Extending the Coherence Time of GNSS Receiver Clocks
|
Conference Paper | Wesson, K.D., K.M. Pesyna, Jr., J.A. Bhatti, T.E. Humphreys | 2010
|
Advances in GNSS Equipment
|
Presentation | T. Humphreys | 2010
|
GNSS Assimilator: A method for upgrading existing GNSS user equipment to improve accuracy, robustness, and resistance to spoofing
|
Trade Magazine Article | Humphreys, T.E., B.M. Ledvina | 2010
|
Frontiers in Radionavigation
|
Presentation | T. Humphreys | 2010
|
Radionavigation Integrity
|
Presentation | T. Humphreys | 2010
|
Riding out the rough spots: Scintillation-robust GNSS carrier tracking
|
Presentation | T. Humphreys | 2010
|
A data-driven testbed for evaluating GPS carrier tracking loops in ionospheric scintillation
|
Journal Paper | Humphreys, 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 Paper | Humphreys, 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 Paper | O’Hanlon, B.W., M.L. Psiaki, P.M. Kintner, Jr., T.E. Humphreys | 2009
|
Receiver-Autonomous Spoofing Detection: Experimental Results of a Multi-antenna Receiver Defense Against a Portable Civil GPS Spoofer
|
Conference Paper | Montgomery, P.Y., T.E. Humphreys, and B.M. Ledvina | 2009
|
Assessing the Civil GPS Spoofing Threat
|
Presentation | T. Humphreys, J. Bhatti, B. Ledvina, M. Psiaki, B. O'Hanlon, P. Kintner, P. Montgomery | 2009
|
Exploiting Multicore Technology in Software-Defined GNSS Receivers
|
Journal Paper | Humphreys, 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 Paper | Humphreys, 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 Article | Montgomery, P.Y., T.E. Humphreys, B.M. Ledvina | 2009
|
GNSS and Ionospheric Scintillation: How to Survive the Next Solar Maximum
|
Trade Magazine Article | Kintner, Jr., P.M., T.E. Humphreys, J. Hinks | 2009
|
Evaluating GPS Receiver Robustness to Ionospheric Scintillation
|
Conference Paper | Hinks, 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 Paper | Humphreys, T.E., B.M. Ledvina, M.L. Psiaki, B.W. O'Hanlon, P.M Kintner, Jr. | 2008
|
Considerations for Future IGS Receivers
|
Conference Paper | Humphreys, T.E., L. Young, T. Pany | 2008
|
A Technique for Determining the Carrier Phase Differences between Independent GPS Receivers during Scintillation
|
Conference Paper | Mohuiddin, S., T.E. Humphreys, M.L. Psiaki | 2007
|
Searching for Galileo
|
Conference Paper | Psiaki, 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 Paper | Humphreys, T.E., M.L. Psiaki, P.M. Kintner, Jr., B.M. Ledvina | 2006
|
The Semidiurnal Variation in GPS-derived Zenith Neutral Delay
|
Journal Paper | Humphreys, T.E., Kelly, M.C., Huber, N., Kintner, Jr., P.M. | 2005
|
GPS Carrier Tracking Loop Performance in the presence of Ionospheric Scintillations
|
Conference Paper | Humphreys, T.E., M.L. Psiaki, P.M. Kintner, Jr., B.M. Ledvina | 2005
|
Magnetometer-based Attitude and Rate Estimation for a Spacecraft with Wire Booms
|
Journal Paper | T.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 Paper | Humphreys, T.E., Ledvina, B.M., Psiaki, M.L., Kintner, Jr., P.M. | 2004
|