Trial Results of a Prototype System to Locate GPS Radio Interference Sources Using Time-Difference-Of-Arrival Measurements

S. Shemar, G. Bond, P. Edmonds, B. Ashforth, and S. Harding

Abstract:	Recent studies have highlighted the possible vulnerabilities of the Global Positioning System (GPS) and their impact on safety-critical systems in national infrastructure. These include man-made low-power sources of radio interference that could be unintentional or intentional. QinetiQ has recently been awarded funding by the UK’s Office of Communications (OFCOM) to further develop a prototype system for locating unauthorised low-power wide-band terrestrial emissions that may cause disruption to sensitive services such as GPS. The system uses spatially separated sensors to take measurements of the signal of interest based on either Time-Difference-Of-Arrival (TDOA) alone or combined TDOA with Frequency-Difference-Of-Arrival (FDOA). We have recently carried out the first outdoor trials of a prototype system to geolocate a GPS interferer. This paper presents a background to the system together with results from these trials.
Published in:	Proceedings of the 2004 National Technical Meeting of The Institute of Navigation January 26 - 28, 2004 The Catamaran Resort Hotel San Diego, CA
Pages:	1018 - 1025
Cite this article:	Shemar, S., Bond, G., Edmonds, P., Ashforth, B., Harding, S., "Trial Results of a Prototype System to Locate GPS Radio Interference Sources Using Time-Difference-Of-Arrival Measurements," Proceedings of the 2004 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2004, pp. 1018-1025.
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