Commercial-off-the-Shelf (COTS) GPS Interference Canceller and Test Results

David M. Upton, Triveni N. Upadhyay, James Marchese, David Greskowiak, Greg Rash

Abstract:	Reliance on GPS as a primary navigation system has renewed interest in GPS anti-jam techniques due to the realization that routinely operated radio transmitters in other services pose unintentional but serious threats to GPS integrity as well as the more-commonly-thought military intentional jamming. Several techniques exist to mitigate the extent of this interference which include frequency domain (spectral), time domain (temporal), and beam-forming or null steering (spatial). In this paper, the basic design of a temporal filter suitable for application to narrowband interference sources is discussed along with examples of how such a technology might be deployed in a real system. Specific issues in the application of the temporal filter such as sampling rate, A/D depth, IF frequency, and RF/IF filtering will be examined. Tradeoffs in the architecture of such a system will be explored. The above issues will then be addressed through a description of the Mayflower Adaptive Inteterference Canceller (AIC) 2000 and 2100 products which implement temporal filtering for civil and military applications. The Mayflower units will then be compared against some commercial GPS receivers under identical conditions to conclude that up to 50 dB of anti-jam improvement is possible to obtain in the narrowband case.
Published in:	Proceedings of the 1998 National Technical Meeting of The Institute of Navigation January 21 - 23, 1998 Westin Long Beach Hotel Long Beach, CA
Pages:	319 - 325
Cite this article:	Upton, David M., Upadhyay, Triveni N., Marchese, James, Greskowiak, David, Rash, Greg, "Commercial-off-the-Shelf (COTS) GPS Interference Canceller and Test Results," Proceedings of the 1998 National Technical Meeting of The Institute of Navigation, Long Beach, CA, January 1998, pp. 319-325.
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