Research of Signal‐in‐Space Integrity Monitoring Based on Inter‐satellite Links

Abstract

Using the Inter-satellite links (ISLs) to enhancethe GNSS's positioning accuracy and integrity isattracting much more attentions. In order to ensure theautonomous positioning accuracy and stability based onISLs, a satellite and ground joint positioning mode is presentedin this paper, which is constrained by quality gradeof position error. Spatial error ellipsoid is applied to calculateparameters and achieve Signal-in-space (SIS) integritymonitoring. To check the accuracy of the mode and performanceof monitoring, mixed constellation of Beidou systemis simulated to support the analysis and investigate the impactof the high-low ISLs. The orbit determination resultsverify that the introduced integritymonitoring method cansatisfy the integrity risk of 10−5/h and achieve the SIS integritymonitoring.