Receiver Clock Stability: an Important Aid in the GPS Integrity Problem

Paul W. McBurney, R . Grover Brown

Abstract:	It is well known that the stability of the GPS receiver clock can be used to help "coast" through periods of high GDOP. A somewhat analogous situation applies when the receiver is attempting to detect slow or incipient satellite failures. The clock, through its stability, provides an additional measurement which slowly degrades with time, but never-the-less provides the needed redundancy for failure detection. The geometric circumstances giving rise to the need for clock coasting are more complicated for failure detection than in the simple navigation problem. This is discussed in the paper. Also, a Kalman filter failure detection scheme which automatically accomplishes the needed clock coasting is presented. Finally, results of Monte Carlo simulations demonstrating the effectiveness of the scheme in both detecting and isolating the errant satellite are given in the paper
Published in:	Proceedings of the 1988 National Technical Meeting of The Institute of Navigation January 26 - 29, 1988 Santa Barbara, CA
Pages:	237 - 244
Cite this article:	McBurney, Paul W., Brown, R . Grover, "Receiver Clock Stability: an Important Aid in the GPS Integrity Problem," Proceedings of the 1988 National Technical Meeting of The Institute of Navigation, Santa Barbara, CA, January 1988, pp. 237-244.
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