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Title page for ETD etd-07302004-140030

Type of Document Master's Thesis
Author Chhokra, Kumar Gaurav
Author's Email Address kg.chhoka@vanderbilt.edu
URN etd-07302004-140030
Title Accuracy enhancements for robust TOA estimation on resource constrained mobile platforms
Degree Master of Science
Department Electrical Engineering
Advisory Committee
Advisor Name Title
D. Mitchell Wilkes Committee Member
Gabor Karsai Committee Member
Theodore Bapty Committee Member
  • Global Positioning System -- Data processing
  • radio geolocation
  • sampling frequency correction
  • signal processing
  • GPS receivers
Date of Defense 2004-08-10
Availability unrestricted
This thesis develops techniques for accurately estimating the time-of-arrival (TOA) on resource constrained sensor units of a distributed radio geolocation system. Firstly, a multi-resolution approach for discriminating between signals of interest and spurious transmissions, which reduces computational costs involved in the discrimination operation by nearly two orders of magnitude, is presented. Secondly, Doppler frequency shifting is proposed as a solution for minimizing the effect of drifting sample rate clocks on different units. To avoid the computational costs associated with the Doppler frequency shifting solution, a related time-domain shifting technique is developed and analyzed. Finally, the problems of estimating a unit’s operating frequency and GPS jitter problem are posed together as a linear regression problem. It was shown that the proposed compensation techniques reduce the error contribution from sampling frequency disparity and GPS jitter from approximately 500 ns down to about 80 ns.
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