Sequential, FSS and Snapshot Approaches to GPS/DGPS Integrity Monitoring

Igor V. Nikiforov

Abstract:	The problems of GPS and differential GPS (DGPS) integrity monitoring are addressed. Receiver au-tonomous (RAIM) and reference station based in-tegrity monitoring algorithms are discussed. Integrity monitoring requires that a navigation system detects, isolates faulty measurement sources, and removes them from the navigation solution before they suf-ficiently contaminate the output. The degradation should be detected as soon as possible when it leads to an unacceptable growth of the position errors. On the other hand, false alarms or false isolations result in lower accuracy of the estimate because some correct information is not used and, conversely, some incor-rect is used. Especially a false isolation can seriously degrade the accuracy of the navigation solution. The optimum involves a trade-off between these contradic-tory requirements. So-called snapshot and fixed size sample (FSS) approaches to GPS channels integrity monitoring are widely known today. Unfortunately, these approaches do not lead to an optimal solution. Our goal is to present an optimal method of fault de-tection/ isolation and to compare it with the snapshot and FSS approaches to GPS/DGPS integrity moni-toring.
Published in:	Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997) September 16 - 19, 1997 Kansas City, MO
Pages:	449 - 458
Cite this article:	Nikiforov, Igor V., "Sequential, FSS and Snapshot Approaches to GPS/DGPS Integrity Monitoring," Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997), Kansas City, MO, September 1997, pp. 449-458.
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