To compare and analyze the precise ephemeris accuracy of three Beidou satellite navigation systems (BDS) of European Orbit Determination Center (CODE), German Geoscience Research Center (GFZ),Wuhan University (WHU), and the influence of BDS geostationary Earth orbit (GEO) satellites on baseline accuracy, the multi-GNSS experiment (MGEX) network stations in Asia and Europe were selected, a comparative analysis was conducted from 3 aspects: the reliability of baseline results, internal accuracy and external accuracy.The results show that the NRMS values of the fixed solution of BDS baseline constraints for the three types of precise ephemeris were all less than 0.3, indicating that the baseline results were reliable; The fixed error of each component of the BDS baseline was within 1 cm, and the proportional error was better than 9×10-9.In Asia, CODE has the highest accuracy, and the average 3D error of the baseline was 5.13 cm with GPS baseline results as external references.In European, the accuracy of the three precise ephemeris was consistent, and the internal accuracy in BDS was better than that of GPS, and the baseline average 3D error was about 1.90cm.In Asia, after disabling BDS GEO satellites, the average internal accuracy improvement in the horizontal and vertical components of GFZ and WHU BDS baselines was about 26.3％ and 23.9％, while the external accuracies increased by about 39.1％ and 51.0％, respectively.For high-precision BDS data processing, precise ephemeris is selected according to the region and GEO satellites are disabled.
万方数据
维普
