• Searching for Galileo 

      Psiaki, Mark L.; Humphreys, Todd E.; Mohiuddin, Shan; Powell, Steven P.; Cerruti, Alessandro P.; Kintner, Paul M. (2006)
      Statistical analysis techniques have been used to find and decode the L1 BOC(1,1) signal of the first prototype Galileo spacecraft, GIOVE-A. The resulting pseudorandom number (PRN) codes can be used by receiver developers ...
    • 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 ...
    • A Technique for Determining the Carrier Phase Differences between Independent GPS Receivers during Scintillation 

      Mohiuddin, Shan; Humphreys, Todd E.; Psiaki, Mark L. (2007)
      A method for recovering the carrier phase differences between pairs of independent GPS receivers has been developed and demonstrated in truth-model simulations. This effort is in support of a project that intends to ...
    • A Testbed for Developing and Evaluating GNSS Signal Authentication Techniques 

      Humphreys, Todd E.; Bhatti, Jahshan A.; Shepard, Daniel; Wesson, Kyle (2014)
      An experimental testbed has been created for developing and evaluating Global Navigation Satellite System (GNSS) signal authentication techniques. The testbed advances the state of the art in GNSS signal authentication ...
    • The Texas Spoofing Test Battery: Toward a Standard for Evaluating GPS Signal Authentication Techniques 

      Humphreys, Todd E.; Bhatti, Jahshan A.; Shepard, Daniel; Wesson, Kyle (2012)
      A battery of recorded spoofing scenarios has been compiled for evaluating civil Global Positioning System (GPS) signal authentication techniques. The battery can be considered the data component of an evolving standard ...
    • Tightly-Coupled Opportunistic Navigation for Deep Urban and Indoor Positioning 

      Pesyna, Kenneth M. Jr; Kassas, Zaher M.; Bhatti, Jahshan A.; Humphreys, Todd E. (2011)
      A strategy is presented for exploiting the frequency stability, transmit location, and timing information of ambient radio-frequency “signals of opportunity” for the purpose of navigating in deep urban and indoor ...