Accuracy evaluation on satellite orbit determination of BDS-3 PPP-B2b service

With the successful networking of the BeiDou-3 Navigation Satellite System, the B2b, a new signal, can provide precise point positioning (PPP) service, which has attracted more and more attention. However, its application was not yet widespread. To explore the performance of the PPP-B2b service signal, we calculated the results of satellite orbit determination based on the B1C and PPP-B2b navigation message data received by our original-designed board. The simulation results compared with that based on the precision ephemeris products and their interpolation results provided by the German Geoscience Research Center. Two error indices (the cross-difference sequence and the root mean square error) were calculated to evaluate the orbit accuracy after broadcast ephemeris and PPP-B2b precise orbit correction. The results show that the broadcast orbit accuracy is generally 0.19 m, 0.65 m and 0.89 m in the radial (R), tangential (T) and normal (N) directions. The average accuracy of precise orbit correction is generally 0.13 m, 0.32 m and 0.29 m in the R、 T 、N directions, respectively. The PPP-B2b service signal received by our original-designed board can satisfy the application requirements of precise point positioning. This would provide data reference for the next development of related products based on PPP-B2b signal.