GPS Aided Mission Enhancements (GAME)

Marvin May, Penn State Applied Research Lab, Andrew Zeger, Steve Minarik

Abstract:	Abstract GPS will be the major navigation system on virtually all military platforms. The vulnerability of GPS to interference has been documented in numerous studies and has resulted in major programs with the purpose of analyzing and mitigating the effects of interference. The paper discusses the GAME project, a demonstration of the use of pseudolites to time aid GPS receivers in a hostile RF environment. For the most part, previous civil applications of pseudolites have assumed that the transmitter is stationary and in an unjammed environment. This paper addresses the issues surrounding the use of pseudolites in a military environment. For this case, the pseudolite transmitter may be located on an airborne platform and transmitting to a jammed GPS receiver. The pseudolite receiver acquires and demodulates the transmitted signal, which is then used to initialize a GPS receiver with time. Data from simulations and preliminary tests are presented that show the benefits and limits to time aiding GPS receivers. Technical issues surrounding the use of a time-aiding signal are discussed and a candidate signal structure is presented. Methods used to test the proposed time-aiding signal using SPAWAR’s GPS test laboratory are discussed.
Published in:	Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998) September 15 - 18, 1998 Nashville, TN
Pages:	841 - 849
Cite this article:	May, Marvin, Lab, Penn State Applied Research, Zeger, Andrew, Minarik, Steve, "GPS Aided Mission Enhancements (GAME)," Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998), Nashville, TN, September 1998, pp. 841-849.
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