Evaluation of Signal in Space Accuracy of New System Signal of BDS-3 Satellite

摘要

Broadcast ephemeris is the basis for satellite navigation system to provide basic positioning and timing service. The precision of signal in space accuracy reflects the distance error caused by the accuracy of broadcast orbit and clock. BDS-3 new system signal has stronger performance and better compatibility. Based on the precise orbit clock error of Wuhan University and DCB products of Chinese Academy of Sciences, the signal in space accuracy of BDS-3 new signal is assessed and analyzed. The results show that the broadcast orbit accuracy of BDS satellite is better than 0.7 m, in which radial direction is about 0.1 m, tangential direction and normal direction are about 0.40 m and 0.45 m respectively. MEO satellite orbit is better than IGSO satellite, which is 0.55 m and 1.12 m, respectively. MEO satellite broadcast clock error accuracy is better than IGSO, 1.7 ns and 3.4 ns, respectively. In terms of signal in space ranging error, BDS satellite is better than 0.6 m, MEO satellite and IGSO are 0.53 m and 1.16 m respectively, which meet the open service performance standard.