BDS3/GPS PPP-B2b定位收敛性能分析

Convergence performance analysis of BDS3/GPS PPP-B2b

基于BDS3提供的PPP-B2b服务,测试分析了不同伪距精度的接收机在PPP-B2b定位收敛时间和收敛精度等方面的差异.结果表明:BDS3单系统定位精度静态30 min可收敛至水平方向优于0.15 m,高程方向优于0.17 m;BDS3/GPS双系统定位精度静态20 min可收敛至水平方向优于0.11 m,高程方向优于0.13 m;相比于BDS3单系统,双系统定位精度水平和高程方向分别提升26.7%和23.5%.此外,平均伪距精度为1.681 m的A接收机,其BDS3单系统PPP-B2b定位收敛30 min后精度为0.331 m,BDS3/GPS双系统收敛20 min后精度为0.250 m;平均伪距精度为0.873 m的B接收机,单系统和双系统对应的收敛精度分别为0.221 m和0.167 m;两者相比,B接收机的平均伪距精度提高0.808 m后,使用其进行PPP-B2b测试BDS3单系统和BDS3/GPS双系统的收敛精度分别提升33.4%和33.2%.

Based on the PPP-B2b service provided by the new BDS3 satellite navigation system,the performance of PPP including convergence time and positioning accuracy is analyzed via receivers with different pseudo-range accuracies.The results show that the accuracy of BDS3-only system after convergence(about 30 min)is better than 0.15 m in horizontal and 0.17 m in vertical direction,respectively.While the accuracy of BDS3/GPS dual system after convergence(about 20 min)is 0.11 m in horizontal and 0.13 m in vertical direction,respectively,both of which are better than the BDS3-only solution.The accuracy of BDS3/GPS solution is improved by 26.7%and 23.5%in horizontal and vertical direction,respectively,when compared with BDS3-only solution.In addition,it also shows that the receiver A with average pseudo-range accuracy of 1.681 m can reach 3D accuracy of 0.331 m(BDS3-only)after convergence of 30 min,and realize 3D accuracy of 0.250 m(BDS3/GPS)after convergence of 20 min in static mode.For the receiver B with average pseudo-range accuracy of 0.873 m,the 3D accuracy is improved from 0.221 m(BDS3-only)with convergence time of 30 min,to 0.167 m(BDS3/GPS)with convergence time of 20 min in static mode.From the above comparisons,it is clearly shown that the receiver B with pseudo-range improved by 0.808 m,can improve positioning accuracy by 33.4%after convergence in BDS3-only solution and 33.2%in BDS3/GPS solution,respectively.