Preliminary integrity assessment for GPS/GLONASS RAIM with multiple faults

This paper reviews the integrity test methodology for the Global Positioning System (GPS) and the Global Orbiting Navigation Satellite System (GLONASS) receiver autonomous integrity monitoring (RAIM) that has been discussed during GPS/GLONASS MOPS [1] elaboration. For this purpose, we present a multiple hypothesis-based approach to test the integrity performance of the GPS/GLONASS RAIM and the corresponding integrity bound against multiple failures. We compute the prob ability of missed detection (PMD) under each failure, and we compare this PMD to the requirement for single failure (i.e., 10
^-4
), as in lines with the proposed MOPS test method. We also compute total probability of hazardous misleading information (PHMI) by accounting for all possible fault hypothesis and compare it with the integrity risk requirement of 10
^-7
. In a preliminary assessment, it is shown that the maximum PMD for a pair of faults is approximately 10
^-7
and the maximum PHMI for multiple satellite failures goes up to approximately 210
^-8
when the proposed method is applied. Also, this paper evaluates the integrity monitoring test procedures outlined by GPS/GLONASS MOPS based on those performance analyses.