Research on the Verification of Autonomous Navigation Technology Based on Inter-satellite Link of BDS Satellite

Up to now, the new generation of BDS-3system has nearly completed the global networking. Different from the BDS-2 satellite, the BDS-3 satellite has the inter-satellite ranging function supported by the inter-satellite link. The introduce of inter-satellite link and inter-satellite ranging enables that BDS-3 system has autonomous navigation function by autonomous orbit and clock difference determination, which has less or no dependence on ground systems. Taking the BDS-3 satellite as an example, this paper evaluates the autonomous navigation results based on inter-satellite and satellite to ground ranging. the influence of the different ranging data to satellites orbits and clock errors was analyzed. The precision of autonomous navigation of BDS-3 system based on inter-satellite ranging has been given.