Recent Submissions

  • A Proposal for Securing Terrestrial Radio-Navigation Systems 

    Kor, Ronnie X.T.; Iannucci, Peter A.; Narula, Lakshay; Humphreys, Todd E. (2020)
    The security of terrestrial radio-navigation systems (TRNS) has not yet been addressed in the literature. This proposal builds on what is known about securing global navigation satellite systems (GNSS) to address this gap, ...
  • Multi-Antenna Vision-and-Inertial-Aided CDGNSS for Micro Aerial Vehicle Pose Estimation 

    Yoder, James E.; Iannucci, Peter A.; Narula, Lakshay; Humphreys, Todd E. (2020)
    A system is presented for multi-antenna carrier phase differential GNSS (CDGNSS)-based pose (position and orientation) estimation aided by monocular visual measurements and a smartphone-grade inertial sensor. The system ...
  • Open-World Virtual Reality Headset Tracking 

    Humphreys, Todd E.; Kor, Ronnie X.T.; Iannucci, Peter A.; Yoder, James E. (2020)
    A novel outdoor Virtual Reality (VR) concept called Open-World Virtual Reality (OWVR) is presented that combines precise GNSS positioning and a smartphone-grade inertial sensor to provide globally-referenced centimeter-a ...
  • Automotive Collision Risk Estimation Under Cooperative Sensing 

    LaChapelle, Daniel; Humphreys, Todd; Narula, Lakshay; Iannucci, Peter; Moradi-Pari, Ehsan (IEEE, 2020)
    This paper offers a technique for estimating collision risk for automated ground vehicles engaged in cooperative sensing. The technique allows quantification of (i) risk reduced due to cooperation, and (ii) the increased ...
  • Accuracy Limits for Globally-Referenced Digital Mapping Using Standard GNSS 

    Narula, Lakshay; Murrian, Matthew J.; Humphreys, Todd E. (IEEE, 2018)
    Exchange of location and sensor data among connected and automated vehicles will demand accurate global referencing of the digital maps currently being developed to aid positioning for automated driving. This paper ...
  • A Comparison of Methods for Online Lever Arm Estimation in GPS/INS Integration 

    Montalbano, Nick; Humphreys, Todd E. (2018)
    A comparison of neural network, state augmentation, and multiple model-based approaches to online location of inertial sensors on a vehicle is presented that exploits dualantenna carrier-phase-differential GNSS. The best ...
  • Low-cost Precise Vehicular Positioning in Urban Environments 

    Humphreys, Todd E.; Murrian, Matthew; Narula, Lakshay (IEEE/ION Position, Location and Navigation Symposium (PLANS), 2018)
    A system developed at The University of Texas for low-cost precise urban vehicular positioning is demonstrated to achieve a probability of correct integer fixing greater than 96.5% for a probability of incorrect integer ...
  • Cross-Modal Localization: Using Automotive Radar for Absolute Geolocation within a Map Produced with Visible-Light Imagery 

    Iannucci, Peter A.; Narula, Lakshay; Humphreys, Todd E. (IEEE, 2020)
    This paper explores the possibility of localizing an automotive-radar-equipped vehicle within an urban environment relative to an existing map of the environment created using data from visible light cameras. Such cross-modal ...
  • Economical Fused LEO GNSS 

    Iannucci, Peter A.; Humphreys, Todd E. (IEEE, 2020)
    In addition to Internet service, new commercial broadband low-Earth-orbiting (LEO) satellites could provide a positioning, navigation, and timing (PNT) service far more robust to interference than traditional Global ...
  • Intercepting Unmanned Aerial Vehicle Swarms with Neural-Network-Aided Game-Theoretic Target Assignment 

    Montalbano, Nicholas G.; Humphreys, Todd E. (IEEE, 2020)
    This paper examines the use of neural networks to perform low-level control calculations within a larger game-theoretic framework for drone swarm interception. As unmanned aerial vehicles (UAVs) become more capable and ...
  • Low SWaP-C Radar for Urban Air Mobility 

    Lies, William A.; Narula, Lakshay; Iannucci, Peter A.; Humphreys, Todd E. (IEEE, 2020)
    A method is developed and tested for extending the range of low-cost radar chipsets for use in urban air mobility (UAM) vehicles. The method employs weak-signal correlation techniques and long measurement intervals to ...
  • Automotive-Radar-Based 50-cm Urban Positioning 

    Narula, Lakshay; Iannucci, Peter A.; Humphreys, Todd E. (IEEE, 2020)
    Deployment of automated ground vehicles (AGVs) beyond the confines of sunny and dry climes will require sub-lane-level positioning techniques based on radio waves rather than near-visible-light radiation. Like human sight, ...
  • TEX-CUP: The University of Texas Challenge for Urban Positioning 

    Narula, Lakshay; LaChapelle, Daniel M.; Murrian, Matthew J.; Wooten, J. Michael; Humphreys, Todd E.; de Toldi, Elliot; Morvant, Guirec; Lacambre, Jean-Baptiste (2020)
    A public benchmark dataset collected in the dense urban center of the city of Austin, TX is introduced for evaluation of multi-sensor GNSS-based urban positioning. Existing public datasets on localization and/or odometry ...
  • CASES: A Novel Low-Cost Ground-based DualFrequency GPS Software Receiver and Space Weather Monitor 

    Crowley, Geoff; Bust, Gary S.; Reynolds, Adam; Azeem, Irfan; Wilder, Rick; O'Hanlon, Brady W.; Psiaki, Mark L.; Powell, Steven; Humphreys, Todd E.; Bhatti, Jahshan A. (2011)
    GPS receivers can be used for monitoring space weather events such as TEC variations and scintillation. This paper describes the new GPS sensor developed by ASTRA, Cornell and UT Austin. The receiver is called “Connected ...
  • CASES: A Smart, Compact GPS Software Receiver for Space Weather Monitoring 

    O'Hanlon, Brady W.; Psiaki, Mark L.; Powell, Steven; Bhatti, Jahshan A.; Humphreys, Todd E.; Crowley, Geoff; Bust, Gary S (2011)
    A real-time software-defined GPS receiver for the L1 C/A and L2C codes has been developed as a low-cost space weather instrument for monitoring ionospheric scintillation and total electron content. The so-called CASES ...
  • Signal Characteristics of Civil GPS Jammers 

    Mitch, Ryan H.; Dougherty, Ryan C.; Psiaki, Mark L.; Powell, Steven P.; O'Hanlon, Brady W. (2011)
    This paper surveys the signal properties of 18 commercially available GPS jammers based on experimental data. The paper is divided into two distinct tests. The first characterizes the jamming signals, and the second ...
  • Civilian GPS Spoofing Detection based on DualReceiver Correlation of Military Signals 

    Psiaki, Mark L.; O'Hanlon, Brady W.; Bhatti, Jahshan A.; Shepard, Daniel P.; Humphreys, Todd E. (2011)
    Cross-correlations of unknown encrypted signals between two civilian GNSS receivers are used to detect spoofing of known open-source signals. This type of detection algorithm is the strongest known defense against so ...
  • A Proposed Navigation Message Authentication Implementation for Civil GPS Anti-Spoofing 

    Wesson, Kyle D.; Rothlisberger, Mark P.; Humphreys, Todd E. (2011)
    A specific implementation of navigation message authentication (NMA) for civil GPS anti-spoofing is proposed. The notion of GNSS signal authentication is defined in probabilistic terms. This work proposes a practical, ...
  • An Evaluation of the Vestigial Signal Defense for Civil GPS Anti-Spoofing 

    Wesson, Kyle D.; Shepard, Daniel P.; Bhatti, Jahshan A.; Humphreys, Todd E. (2011)
    A receiver-autonomous non-cryptographic civil GPS antispoofing technique called the vestigial signal defense (VSD) is defined and evaluated. This technique monitors distortions in the complex correlation domain to ...
  • Characterization of Receiver Response to Spoofing Attacks 

    Shepard, Daniel P.; Humphreys, Todd E. (2011)
    Test procedures are developed for characterizing the response of civil GPS receivers to spoofing attacks. Two response characteristics are analyzed in detail for four representative GPS receivers: (1) the spoofer power ...

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