Test Results on Mitigation of SATCOM-Induced Interference to GPS Operation

Dennis Weed, Triveni Upadhyay, George Dimos, and Wassim Ferzali

Abstract:	The vulnerability of GPS to intentional or unintentional interference signals has been analyzed and incidence of observed interference has been reported by others [l]. During the past few years both milim and commercial organizations have made investments to develop techniques to mitigate GPS interference concerns. One such technique, namely the Adaptive Transversal Filter (ATF), was developed and patented [S] by Mayflower Communications to mitigate narrowband interference to GPS. An example of a potential narrowband’ interference to GPS is the AMSS (Aeronautical Mobile Satellite Service) SATCOM- induced intermod interference. This paper discusses the nature of this interference source and the means to mitigate it using the Mayflower ATF technology. The paper also discusses other interference mitigation techniques for narrowband interference and compares it with the ATF technology. The paper summarizes the results of a recent test campaign using RF-simulated SATCOM intermod interference signals with a C/A code GPS receiver incorporating the ATF circuits. These results, performed for FAA SATCOM Program Office, demonstrated that an additional 20 to 30 dB of interference protection can be provided to a commercial GPS receiver using ATF. This additional interference protection provides sufficient margin for any link budget contingencies for simultaneous SATCOM/GPS operation for air transport as well as for General Aviation (GA) applications.
Published in:	Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995) September 12 - 15, 1995 Palm Springs, CA
Pages:	1545 - 1552
Cite this article:	Weed, Dennis, Upadhyay, Triveni, Dimos, George, Ferzali, Wassim, "Test Results on Mitigation of SATCOM-Induced Interference to GPS Operation," Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995), Palm Springs, CA, September 1995, pp. 1545-1552.
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