GNSS融合动态精密单点定位性能分析

基于武汉大学PANDA软件生成的GPS/GLONASS/BDS/Galileo四系统精密轨道和钟差产品，采用MGEX跟踪站多模观测数据进行试算，对GPS、GPS/BDS、GPS/GLONASS、GLONASS/BDS、GPS/GLONASS/BDS以及GPS/GLONASS/BDS/Galileo 7种模式的动态精密单点定位的精度和收敛性进行比较。结果表明：1）BDS动态PPP收敛速度较慢，收敛后精度能够达到cm级；2）GPS/BDS融合定位北方向分量精度不如GPS单系统定位，但东方向和高程方向分量收敛速度和定位精度都得到改善；GPS/GLONASS和GLONASS/BDS融合定位提高了东方向、北方向和高程方向分量的收敛速度和定位精度；3）GPS/GLONASS/BDS融合定位20 min即可收敛，收敛后平面精度优于1 cm，高程精度优于3 cm；Galileo的引入对收敛速度和定位精度的改善不明显。

Performance Analysis on Multi-GNSS Kinematic Precise Point Positioning

Based on the precise orbit and satellite clock corrections products of BDS, GPS, GLONASS and Galileo generated by the PANDA software package of Wuhan University, we analyze the positioning precision and the convergence time of kinematic PPP in 7 modes, including BDS-only, GPS-only, combined BDS and GPS, combined BDS and GLONASS, combined GPS and GLONASS, combined BDS, GPS and GLONASS, and combined BDS, GPS, GLONASS and Galileo, by processing data from MGEX. The results illustrate that: 1) The convergence speed of BDS kinematic PPP was very slow and the precision could reach the centimeter level after convergence. 2) The precision in the north component of GPS/BDS kinematic PPP is worse than that of GPS-only ones but the convergence speed and the positioning precision improves in the East and Up components. The convergence speed and the precision of GPS/GLONASS and GLONASS/BDS kinematic PPP are also improved. 3) The precision in the plane and vertical direction can reach 1 cm and 3 cm after 20 minutes, respectively. The introduction of Galileo satellites hardly changed the convergence time and precision.