Evaluation of relative GPS timing under jamming conditions

Ryan J R Thompson, Ediz Cetin, Andrew G. Dempster

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

5 Citations (Scopus)

Abstract

In this paper the performance of GPS timing under jamming conditions is evaluated in the context of a GPS jammer localization system that uses the Time-Difference-Of-Arrival (TDOA) technique. To investigate the performance of GPS timing receivers under jamming conditions, jammer signals of different types and powers were combined with real GPS signals and input into two timing receivers and the response of the PPS and frequency outputs measured. It was found that for at least 3 seconds after the jammer was turned on there was no noticeable drift. This is long enough to switch to a backup timing source or to perform a number of TDOA measurements. The implementation of post-processed time synchronization based on common-view satellite time transfer was also explored to examine the performance that can be expected when using the GPS signals embedded in the data captured for TDOA localization. The relative clock drift between two GPS receivers was then measured for 11 hours to see how Temperature Compensated Crystal Oscillators (TCXOs) behave over time. Using a linear fit to the relative clock drift values before simulated GPS outages, it was found that in the worst case a similar amount of holdover could be achieved as the timing receivers before the drift became significant. The performance of the timing receivers during a jammer localization field-trial was then analyzed. It was found that the TDOA localization could be improved significantly by correcting for timing offsets detected using the post-processing technique.

Original languageEnglish
Title of host publication25th International Technical Meeting of the Satellite Division of the Institute of Navigation 2012, ION GNSS 2012
Place of PublicationManassas, VA
Pages717-730
Number of pages14
Volume1
Publication statusPublished - 2012
Externally publishedYes
Event25th International Technical Meeting of the Satellite Division of the Institute of Navigation 2012, ION GNSS 2012 - Nashville, TN, United States
Duration: 17 Sep 201221 Sep 2012

Other

Other25th International Technical Meeting of the Satellite Division of the Institute of Navigation 2012, ION GNSS 2012
CountryUnited States
CityNashville, TN
Period17/09/1221/09/12

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  • Cite this

    Thompson, R. J. R., Cetin, E., & Dempster, A. G. (2012). Evaluation of relative GPS timing under jamming conditions. In 25th International Technical Meeting of the Satellite Division of the Institute of Navigation 2012, ION GNSS 2012 (Vol. 1, pp. 717-730). Manassas, VA.