Performance Assessment of BDS Real-Time Precise Point Positioning Based on SSR Corrections

摘要

In recent years, real-time precise point positioning (RTPPP) using the BeiDou Navigation Satellite System (BDS) is facing new developments thanks to the dissemination of BDS real-time state space representation (SSR) corrections provided by some institutions. However, the quality and accuracy levels of these corrections remain unclear because they have not been provided for long. In this paper, methods of data accessing for RTPPP are introduced, and the quality of BDS real-time products provided by the Centre National d'Etudes Spatiales (CNES) and the performance of BDS-RTPPP are assessed and validated. It is indicated that the products currently suffer from the issues of unavailability and discontinuity, along with limited product accuracy. BDS-RTPPP is then implemented based on these corrections to validate positioning performance. For 6-h observations, the average final result of static positioning reaches 1.31, 2.15, and 6.18 cm in the north, east, and up components, respectively, and the average convergence time is 73.4 min. As for kinematic positioning, an average accuracy of 4.76, 6.70, and 7.07 cm can be achieved after an average convergence time of 86.1 min.