全球区域BDS、GPS、BDS+GPS静动态PPP定位精度评估分析

Evaluation analysis of global BDS,GPS,BDS+GPS static and dynamic PPP positioning accuracy

利用全球区域的7个IGS站的观测数据以及GPS和BDS的精密轨道和钟差产品,分析了BDS、GPS和BDS+GPS组合的卫星数量、几何空间分布以及静动态PPP精度。实验结果表明,GPS在全球7个测站的卫星数在10颗左右,卫星分布较均匀;BDS在Alic(大洋洲)、Iisc(亚洲)、Zamb(非洲)的卫星数明显多于GPS,其余测站卫星数量相当。数据表明,GPS+BDS卫星数量和卫星几何空间分布状态明显优于单系统。在静态PPP中,BDS在Maw1(南极洲)和Unsa(南美洲)精度略低于GPS,其余测站精度相当;GPS+BDS在7个测站U、N、E方向基本在1 cm左右,相对BDS、GPS单系统定位精度有一定提升。在动态PPP中,BDS在Nlib(北美洲)、Unsa的定位精度低于GPS,其余测站定位精度则要优于GPS,但BDS和GPS单系统在全球区域定位性能都不够稳定。GPS+BDS在7个测站U、N、E方向定位精度分别优于0.06 m、0.03 m、0.03 m,在动态PPP中相对于BDS和GPS 7个测站的精度均有提升,说明了GPS+BDS组合可以提高PPP精度并且可以极大改善定位的可靠性。

The satellite distribution of different stations,the geometric spatial distribution of BDS,GPS and BDS combined satellite and the static and dynamic PPP accuracy are analyzed by using the observation data of seven IGS stations in the global region and the precise orbit and clock difference products of GPS and BDS.The experimental results show that the number of GPS satellites in seven stations around the world is about 10,and the distribution of satellites is relatively uniform.BDS has significantly more satellites in Alic(Oceania),Iisc(Asia)and Zamb(Africa)than GPS,and the rest of the stations have similar numbers.The data show that the number of GPS+BDS satellites and the geometric spatial distribution of satellites are obviously better than that of single system.In the static PPP,the accuracy of BDS is slightly lower than that of GPS in Maw1(Antarctica)and Unsa(South America),and the accuracy of other stations is similar.GPS+BDS is basically about 1cm in the U,N and E directions of the 7 stations,which has a certain improvement in positioning accuracy compared with BDS and GPS single system.In dynamic PPP,the positioning accuracy of BDS in nlic and Unsa is lower than that of GPS,and the positioning accuracy of other stations is better than that of GPS.However,the positioning performance of BDS and GPS single system is not stable in the global region.The positioning accuracy of GPS+BDS is better than 0.06 m,0.03 m and 0.03 m in the U,N and E directions of the 7 stations,respectively.The accuracy of GPS+BDS is improved compared with BDS and GPS in the dynamic PPP,which indicates that the combination of GPS+BDS can improve the PPP accuracy and greatly improve the reliability of positioning.