A Comparison of RAIM Fault Detection Availability Using Optimal 24 and Yuma GPS Almanacs

Keith Schmidtke, Randy Reuter

Abstract:	This paper explores the similarities and differences of the actual GPS constellation, represented by the Yuma almanacs, relative to the Optimal 24 satellite constellation model from the perspective of the commercial aviation industry. The Optimal 24 model is an industry baseline often used both for verifying and evaluating the performance of GPS equipment. From a practical point of view, the actual GPS constellation can not be maintained to match the Optimal 24 model perfectly. This paper investigates how well the actual GPS constellation performs relative to the Optimal 24 model using criteria commonly used by the commercial aviation industry. The authors of this paper realize that there are many methods of comparing and contrasting the actual constellation against the Optimal 24 model. It is the intent of the authors to evaluate these constellations from a few different perspectives to provide a general insight on the performance of these constellations relative to each other.
Published in:	Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999) September 14 - 17, 1999 Nashville, TN
Pages:	1835 - 1842
Cite this article:	Schmidtke, Keith, Reuter, Randy, "A Comparison of RAIM Fault Detection Availability Using Optimal 24 and Yuma GPS Almanacs," Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999), Nashville, TN, September 1999, pp. 1835-1842.
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