Effects of Worst Case Geometries on RAIM Testing

Christine Easton and William Michalson

Abstract:	This paper describes using different sets of user locations for the off-line MOPS test to identify any condition where the current procedure could result in overestimating a RAIM algorithm’s performance. The supplemental Minimum Operation Performance Standard (MOPS), RTCA DO-208 document [ 11, specifies the worldwide geographic user locations to use for off-line testing of RAIM algorithms. These locations are used to verify that a RAIM algorithm meets the MOPS detection probability and alarm rate requirements for any global location at all times. If the MOPS test locations contain true worst case geometries,‘then the detection probability should be satisfied globally. To determine if the MOPS off-line RAIM test includes true worst case geometries, a test scenario at the maximum probability of missed detection and the maximum allowable alarm rate using the MOPS specified locations is established. Under the same test scenario, replacing the MOPS locations with a grid of locations should not cause an increase in the missed detection probability. The detection and alarm tests are run with a 5 degree grid over the Northern Hemisphere to generate globally distributed geometries. The results of this experiment are presented in this paper.
Published in:	Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995) September 12 - 15, 1995 Palm Springs, CA
Pages:	2015 - 2022
Cite this article:	Easton, Christine, Michalson, William, "Effects of Worst Case Geometries on RAIM Testing," Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995), Palm Springs, CA, September 1995, pp. 2015-2022.
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