The Effect of Geometry on Integrity Monitoring Performance

Alison Brown and Mark Sturza

Abstract:	A variety of integrity monitoring and failure detection algorithms have been described in previous literature for GPS and inertial navigation systems. -These algorithms have in common their use of redundant information to detect and identify system component faults. Receiver Autonomous Integritv Monitoring (RAIM) algorithms designed for GPS recerveri make use- of red&da5 measuremeits to GPS satellites to detect and isolate faults in any individual satellite signal. Fault-tolerant inertial navi ation systems use data from redundant instruments in a similar ashron to detect and identify B faults in any instrument. One key area of interest is the minimum GPS satellite geometry conditions that are required for RAIM algorithms to be effective. The Radio Technical Commission for Aeronautics 6 RTCA) Special Committee 159 has prepared a Minimum perational Performance Standard (MOPS) which specifies the alarm threshold. detection urobabilitv and allowable false alarm rate for different phases of flight. Th”is paper derives a geometry parameter that can be used to define when RAIM is effective for each phase of flight. The integrity geometry parameters can also be applied in evaluatine the nerformance of redundant inertial navieation systems i”n the presence of single or multiple instrument &tilts. To continue navigating in the presence of a failure, it is necessary not only to detect that a failure occurred but also identify the faulty component. The integrity geometry parameter allows the optimum geometry to be determined for maximizing the probability of failure detection and isolation in the presence of multiple instrument faults.
Published in:	Proceedings of the 46th Annual Meeting of The Institute of Navigation (1990) June 26 - 28, 1990 Atlantic City, NJ
Pages:	121 - 129
Cite this article:	Brown, Alison, Sturza, Mark, "The Effect of Geometry on Integrity Monitoring Performance," Proceedings of the 46th Annual Meeting of The Institute of Navigation (1990), Atlantic City, NJ, June 1990, pp. 121-129.
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