BDS-3实时精密单点定位精度分析

The real-time PPP precision analysis based on BDS-3

基于武汉大学自主研发的GNSS高精度数据处理软件PANDA,本文采用MGEX网测站BDS-2/BDS-3连续一周的观测数据,通过仿实时处理BDS-3精密轨道与钟差产品进行BDS-3卫星实时精密轨道产品重叠弧段评估,实时轨道径向精度优于10 cm,实时钟差STD优于0.3 ns。在此基础上验证分析了BDS-2、BDS-3及BDS-2+BDS-3融合的实时静态PPP与实时动态PPP定位。试验结果表明:BDS-3静态PPP定位精度水平优于2 cm,高程优于4 cm;BDS-2+BDS-3联合实时动态PPP收敛时间相较BDS-2分别提升了约38.2%、75.0%、49.7%;收敛后E方向精度优于3 cm,N方向精度优于2 cm,平均提升了38.2%,高程方向精度优于6 cm,平均提升了64%。

To provide real-time BDS-3 satellite precision orbit and clock products,the daily observations of DOY 143—150 in 2019 from MGEX stations which were recorded in simulated real-time mode were selected to calculate by PANDA in this paper.The evaluation of overlapping arcs of BDS-3 satellite real-time precision orbit products shows that the radial accuracy of real-time orbit is better than 10 cm,and the real-time clock difference STD is better than 0.3 ns.On this basis,the real-time static PPP and real-time dynamic PPP positioning based on the BDS-2,BDS-3 and the fusion of BDS-2+BDS-3 were verified and analyzed.The experimental results show that the horizontal positioning accuracy of BDS-3 static PPP is better than 2 cm and the elevation accuracy is better than 4 cm,the convergence time of BDS-2+BDS-3 combined real-time dynamic PPP is 38.2%,75.0%,49.7%higher than BDS-2 respectively.After convergence,the E direction accuracy is better than 3 cm,the N direction accuracy is better than 2 cm,the average improvement is 38.2%.Besides,the elevation direction accuracy is better than 6 cm,which increases 64%averagely.