Abstract Based on summarizing the existing matrix maximum eigenvalue method(MMEM) of RAIM availability evaluation, we improve the mathematical model in the existing RAIM availability method under double-satellite faults conditions, and propose the maxima method(MM) of RAIM availability evaluation. Based on the given integrity risk parameters and the BDS measured data of 8 tracking stations in China provided by the international GNSS monitoring and assessment system(IGMAS) on September 6, 2020, we use the two methods to calculate the horizontal protection level(HPL) under double-satellite faults conditions to compare and analyze the RAIM availability performance of BDS. The results show that the MMEM-based RAIM availability is lower than that of the MM in non-precision approach(NPA) in China, the overall MMEM-based RAIM availability is higher than that of MM, but the MM method consumes less calculation time. The MM-based RAIM availability can fully meet the route and ocean stages, and the MMEM-based RAIM availability can fully meet the terminal, route and ocean stages. The MM-based RAIM availability has rigorous theory, a simple mathematical model, and is easy to program. It is another RAIM availability evaluation method besides MMEM.
MA Xiaping,YU Kegen,HE Xiaoxing et al. An Improved Method of RAIM Availability Evaluation under Double-Satellite Faults Conditions[J]. jgg, 2022, 42(9): 931-937.
MA Xiaping,YU Kegen,HE Xiaoxing et al. An Improved Method of RAIM Availability Evaluation under Double-Satellite Faults Conditions[J]. jgg, 2022, 42(9): 931-937.