Robust lmplementation of Relative GPS Guidance

Neeraj Pujara, Mark Youhanaie, David Hartman, and Frank Ziolkowski

Abstract:	Much attention has been given recently to the application of Differential GPS (DGPS) phenomenology to improve the accuracy of precision guidance weapons. Specifically, we consider scenarios where a targeting system provides target coordinates using an on-board GPS for its inertial reference system. By guiding the weapon in a coordinate frame that is correlated to the GPS bias errors inherent in the targeting data, guidance accuracies can be improved to near “precision” level without the use of a terminal guidance seeker. Initial Relative GPS concepts have been proposed to achieve this correlation by slaving the weapon GPS receiver to “track the same four satellites” as the GPS receiver on the targeting aircraft. While this simplistic approach may be effective in some scenarios, it is not sufficiently robust for general implementation. This paper identifies and examines specific issues that must be resolved before Relative GPS guidance can be considered an implementable methodology. Several candidate solutions are presented and evaluated through simulation and analysis. Detailed consideration of these implementation issues was a subject of the USAF GPS Exploitation for Precision Targeting Program with Hughes Aircraft Company.
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:	391 - 398
Cite this article:	Pujara, Neeraj, Youhanaie, Mark, Hartman, David, Ziolkowski, Frank, "Robust lmplementation of Relative GPS Guidance," 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. 391-398.
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