Design and Analysis of Beidou Global Integrity System Based on LEO Augmentation

In view of the problem that ground-based monitoring in China is difficult to distribute stations around the world, the global integrity service of Beidou is limited. This paper proposes a Beidou global integrity monitoring system based on the LEO constellation. The global integrity service of Beidou is provided through the monitoring and redundancy voting of the high-precision monitoring receiver and the inter-satellite link of real-time transmission on the LEO satellite. In terms of integrity monitoring methods, the types of satellite on-board faults and monitoring methods based on pseudorange and carrier phase observation measurements are analyzed. The simulation of Spirent GSS9000 simulator verifies the feasibility of the monitoring method. The results show that the pseudorange and carrier phase monitoring methods proposed in this paper can complete the integrity monitoring of the orbit and clock bias. 24 LEO satellites can meet the global triple coverage of Beidou satellites. Through LEO redundant voting, the integrity risk can meet the requirements of CAT I.