北斗三号 PPP-B2b 服务性能评估 .

Objectives: With the ability of providing real-time precise point positioning (RTPPP) service for China and surrounding countries, the application of BeiDou-3 navigation satellite system(BDS-3) precise point positioning(PPP)-B2b signals have seen a rapid rise in recent years. And the performance evaluation is a vital issue for large deployment in the future, such as the evaluation about the accuracy of orbit and clock error, as well as the analysis of precision and and convergence time for PPP. Methods: Based on the observations from September 2020 of the China branch stations of international GNSS monitoring and assessment system(iGMAS), the accuracy of orbit and clock error, as well as the positioning accuracy of B1I+B3I and B1c+B2a signal combination are carefully evaluated in this dissertation. Results: The results show that the average accuracy of PPP-B2b orbit products in radial, along-track and cross-track directions are 0.1 m,0.31 m and 0.3 m, respectively. Besides, the root mean square of clock error correction is 2.26 ns. In terms of PPP convergence, the convergence time of the B1I+B3 signal combination using GFZ BeiDou multi-GNSS(GBM) products is the quickest in the north, east and up directions, with the highest final con‐ vergency accuracy. The second is B1I + B3I (PPP-B2b), and B1c + B2a(PPP-B2b) is at the last. Conclusions: Summarizing the above discussions, BDS-3 PPP-B2b signals is capable of providing regional PPP service in China. [ABSTRACT FROM AUTHOR]