Abstract
Compared with BeiDou-2, BeiDou-3 has obvious advantages in geometric configuration and frequency richness, which can improve satellite geometric distribution, greatly reduce observation noise, and provide users with higher integrity positioning service. The simulation method is used to analyze the influence of the increase of BeiDou satellite number and the improvement of observation quality on RAIM performance. It is found that the RAIM algorithm after the global coverage of BeiDou-3 is too conservative in terms of false alarm and missed detection performance, and its availability level is too strict. Then the paper proposes a method based on the equal risk allocation of missed detection probability. By averaging the missed detection probability to the visible satellite, a more reasonable risk allocation can be achieved. The simulation test results show that compared with the classical method, the RAIM algorithm with equal risk allocation method can obtain less integrity risk and improve the availability level.
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