Performance Measures of Receiver-Autonomous GPS Integrity Monitoring

Rudolph M. Kalafus, Gerald Y. Chin

Abstract:	Receiver-Autonomous Integrity Monitoring (RAIM) of GPS signals is currently under consideration as a technique for assuring the integrity of the Global Positioning System (GPS) without reference to an independent ground monitor. The concept here is to apply consistency checks to the ranging measurements when more than four satellites are visible. Previous treatments of the subject have not fully addressed the operational implications of the RAIM techniques proposed. This paper starts from stated aeronautical operational requirements for non-precision approaches and derives an appropriate measure against which different detection techniques can be evaluated. By stating the problem in terms of probabilities of normal operation, misses, detections and false alarms, it is shown that the unconditional miss rate is the appropriate measure for RAIM. This approach is applied to the problem of detecting a malfunction associated with a monotonically drifting range error before the navigation positional error exceeds a stated performance limit. Quantitative results are provided using a Monte Carlo simulation for one of the RAIM techniques currently under consideration.
Published in:	Proceedings of the 1988 National Technical Meeting of The Institute of Navigation January 26 - 29, 1988 Santa Barbara, CA
Pages:	223 - 229
Cite this article:	Kalafus, Rudolph M., Chin, Gerald Y., "Performance Measures of Receiver-Autonomous GPS Integrity Monitoring," Proceedings of the 1988 National Technical Meeting of The Institute of Navigation, Santa Barbara, CA, January 1988, pp. 223-229.
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