Performance assessment of real-time precise point positioning using BDS PPP-B2b service signal

China's BeiDou Navigation Satellite System (BDS) can provide real-time precise point positioning (PPP) service for users in China and surrounding areas with PPP-B2b signal. In this paper, real-time PPP is assessed and studied based on 8 days of PPP-B2b and BDS/GPS broadcast messages. Real-time precise ephemerides are compared against Multi-GNSS Experiment (MGEX) final products and the positioning performance of real-time PPP is evaluated with MGEX/iGMAS stations. Results show that the real-time orbit accuracy is about 0.0725, 0.2479 and 0.2587 m in directions of radial (R), along (A) and cross (C) for BDS-3 satellites, and 0.0729, 0.3098 and 0.2193 m for GPS satellites. The standard deviation values of the clock offset errors are about 0.05-0.18 ns for BDS-3 satellites, and 0.05-0.15 ns for GPS satellites. In addition, the differential code bias (DCB) parameters of PPP-B2b agree well with parameters of MGEX DCB and time group delay (TGD), with the differences less than 2 and 0.15 ns, respectively. Furthermore, for the positioning experiments, the average positioning accuracies of BDS and GPS integrated real-time PPP are about 1.07, 2.69 and 2.25 cm in north (N), east (E), and up (U) directions for static mode; and about 3.6, 5.9 and 9.4 cm for kinematic mode. Moreover, the convergence times for an accuracy level of 20 cm in N, E and U components are about 8-22 min, and 10-8 min, for static mode and kinematic mode, respectively. (C) 2021 COSPAR. Published by Elsevier B.V. All rights reserved.

Automated summary

The paper evaluates the performance of China's BeiDou Navigation Satellite System in real-time precise point positioning, showing high orbit and clock offset accuracy, as well as good agreement with differential code bias parameters of MGEX. The positioning accuracy performs well in both static and dynamic modes.