A Generic Method for Protection Level Evaluation Under the Assumption of Two Simultaneous Faulty Measurements

F. Faurie, A. Giremus, S. Szelewa, J.C. Goudon

Abstract:	Navigation systems used on board civil aircrafts have to fulfill stringent performance requirements defined by the International Civil Aviation Organization (ICAO). When using the Global Navigation Satellite System (GNSS), satellite failures yield unacceptable positioning errors with regards to ICAO recommendations. To overcome this difficulty, integrity monitoring algorithms are classically designed to detect and exclude the faulty GNSS measurements prior to estimating the mobile location. The so-called protection levels are performance indicators of such algorithms. They define an area where the aircraft location is guaranteed unless an integrity alert is raised with a given probability of missed detection. The deployment of new satellite constellations is a solution to satisfy the most stringent phases of flight. However, it makes the usual assumption of one faulty satellite at a time questionable. Thus, the occurrence of two simultaneous satellite failures has to be taken into account when computing the protection levels. In this communication, we propose a method to compute these bounds which can guarantee the aircraft location in the presence of two simultaneous faulty measurements and meet the integrity requirements.
Published in:	Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011) September 20 - 23, 2011 Oregon Convention Center, Portland, Oregon Portland, OR
Pages:	2713 - 2722
Cite this article:	Faurie, F., Giremus, A., Szelewa, S., Goudon, J.C., "A Generic Method for Protection Level Evaluation Under the Assumption of Two Simultaneous Faulty Measurements," Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011), Portland, OR, September 2011, pp. 2713-2722.
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