Integrating GPS with Ranging Transponders

Jonathan S. Abel, James W. Chaffee

Abstract:	The problem of integrating GPS pseudorange messurements with transponder ranges is studied. We focus on two topics: the performance improvement noted when transponder ranges are integrated with GPS as compared to the case of GPS only, and simple methods which realize such an improvement. Using the information inequality to gauge the accuracy of receiver position estimates, fix accuracy is studied as a function of the problem geometry and, in particular, the number of GPS pseudoranges and transponder ranges available. The accuracy of position estimates is seen to be increasing with the number of pseudoranges and ranges used, with transponder ranges providing additional accuracy in directions of receiver transponder lines of sight. Finally, a position estimator which integrates transponder ranges and GPS pseudoranges is presented and simulated. The position estimate is shown to have accuracy approaching that given by the information inequality.
Published in:	Proceedings of the 1991 National Technical Meeting of The Institute of Navigation January 22 - 24, 1991 Sheraton San Marcos Hotel Phoenix, AZ
Pages:	15 - 24
Cite this article:	Abel, Jonathan S., Chaffee, James W., "Integrating GPS with Ranging Transponders," Proceedings of the 1991 National Technical Meeting of The Institute of Navigation, Phoenix, AZ, January 1991, pp. 15-24.
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