An Extremum Approximation ARAIM Algorithm Based on GPS and BDS

Advanced receiver autonomous integrity monitoring (ARAIM) is a new technology that can reduce the vertical protection level (VPL) by optimizing the probability of configuration information to improve availability. Compared with traditional receiver autonomous integrity monitoring (RAIM), the powerful vertical guidance capability of ARAIM highlights its advantages. This paper improves ARAIM performance by reducing the difference between the two most important view solutions affecting the VPL and the all-in-view solution while satisfying the accuracy. First, this paper proposes new constellation configurations suitable for GPS/BDS, which is a nontraditional constellation itself; second, this paper proposes a method called EA-ARAIM for improving ARAIM performance. The results show that for the depleted constellation in the case of visible satellite reduction, the coverage can increase from 59.97% to 76.63% with the assistance of EA-ARAIM. Even for the optimistic constellation, where there is not much room to improve availability, the improved algorithm can increase the coverage to approximately 3%. Finally, compared with the simulation data used in most of the literature, this paper uses real data obtained from MGEX for analysis.