Differences Research in Time Comparison and Positioning of BDS-3 PPP-B2b Signal Broadcast Through GEO

Three stations in the Asia-Pacific region are selected to form two time comparison links. By comparing the correction accuracy of the satellite orbits and clock deviations of the PPP-B2b messages broadcast by the two GEO satellites of BDS-3 C59 and C61, and taking the time comparison results obtained by the GBM post-ephemeris as a reference, the accuracy of the time comparison of the PPP-B2b messages broadcast by the two GEO satellites C59 and C61 was evaluated. The results show that the accuracy of time comparison between C59 and C61 is similar, but the stability and availability of C59 are better than those of C61. In addition, five IGS/IGMAS stations were selected to evaluate the accuracy of the PPP-B2b message transmitted by the C59 and C61 GEO satellites for BDS-3 positioning, using the IGS/IGMAS weekly solution positioning results as a reference. The results show that the static positioning of PPP-B2b broadcasted by C59 and C61 can reach centimeter level, and the simulated kinematic positioning can reach decimeter level. The positioning accuracy of C59 is higher than that of C61.