BDS-3/BDS-2/GPS短基线RTK性能对比分析

Performance Comparison of BDS-3/BDS-2/GPS RTK for Short Baseline

旨在基于最新的实测静态与车载动态数据,分析BDS-3完全建成情况下的短基线实时动态(real-time kinematic,RTK)定位性能,并与BDS-2/GPS RTK定位性能进行对比。结果表明,在亚太区域,BDS-3 RTK定位性能优于BDS-2和GPS。BDS-2+BDS-3RTK定位性能相较于BDS-2和BDS-3有大幅提升,在观测条件较差的情形下,提升更为显著。静态实验中,仅单频观测值可用、截止高度角为10°时,BDS-2+BDS-3的模糊度解算正确率为100%,显著高于BDS-3(94.2%)、BDS-2(76.5%)以及GPS(48.8%)。BDS-2+BDS-3在E、N、U方向上定位误差序列的均方根误差(root mean square error,RMSE)为0.21 cm、0.28 cm、0.70 cm,优于BDS-3(0.25 cm、0.26 cm、0.84 cm)、BDS-2(0.31cm、0.37cm、1.00cm)以及GPS(0.29cm、0.39 cm、0.96 cm)。动态实验中,当仅用单频观测值,截止高度角为35°时,BDS-2+BDS-3的模糊度解算正确率仍能达到100%,而BDS-3、BDS-2、GPS的模糊度解算正确率分别为72.5%、54.5%、0.9%,BDS-2+BDS-3、BDS-3、BDS-2、GPS的3D RMSE分别为0.46 cm、0.64 cm、1.80 cm、1.19 cm。

Based on the newly collected raw static and cardriven kinematic data,we analyze the performance of short baseline real-time kinematic(RTK)positioning with BDS-3 fully built,and compare it with that of BDS-2 and GPS.Ex⁃perimental results demonstrate that the RTK positioning per⁃formance of BDS-3 RTK is better than that of BDS-2 and GPS in the Asia-Pacific region.Compared with BDS-2 and BDS-3,the RTK positioning performance of BDS-2+BDS3 is significantly improved,particularly in poor observation conditions.In the static test,when only single-frequency ob⁃servation is available and the cutoff height angle is 10°,the ambiguity resolution success rate of BDS-2+BDS-3 is 100%,which is significantly better than that of BDS-3(94.2%),BDS-2(76.5%),and GPS(48.8%).The rootmean square errors(RMSE)of BDS-2+BDS-3 in E,N,U directions are 0.21 cm,0.28 cm and 0.70 cm,respectively,which is better than that of BDS-3(0.25 cm,0.26 cm,0.84 cm),BDS-2(0.31 cm,0.37 cm,1.00 cm),and GPS(0.29 cm,0.39 cm,0.96 cm).In the kinematic test,when only us⁃ing single-frequency observations with an elevation cut-off an⁃gle of 35o,the ambiguity resolution success rate still achieves 100%,while ambiguity resolution success rates of BDS-3,BDS-2,and GPS are 72.5%,54.5%and 0.9%,respective⁃ly.The 3D RMSE values of BDS-2+BDS-3,BDS-2,BDS-3,and GPS are 0.46 cm,0.64 cm,1.80 cm,and 1.19 cm,respectively.