GEO对BDS伪距单点定位影响分析

Analysis of GEO′s Influence on BDS Pseudo-range Single Point Positioning

BDS星座构成不同于其他导航定位系统,GEO卫星的独特性将会增加我国BDS定位的优势,因此,本文选取多个MGEX跟踪站数据,分析了GEO卫星对BDS系统B1I和B3I单频伪距单点定位精度的影响。实验结果表明,GEO卫星能明显改善BDS卫星可用性,使BDS卫星可见数有明显增加,使PDOP值有明显降低,同时GEO卫星能有效提升BDS伪距单点定位精度,使伪距单点定位精度提升都在分米级,水平定位精度提升量在13%以上,高程定位精度提升量在10%以内。

The composition of BDS constellation is different from other navigation and positioning systems.The uniqueness of GEO satellites will increase the advantages of BDS positioning in China.Therefore,this paper selects data from multiple MGEX tracking stations and analyzes the influence of GEO satellites on B1I and B3I single-frequency pseudo-ranges single point positioning accuracy of BDS systems.The experimental results show that the GEO satellite can significantly improve the availability of BDS satellites,significantly increase the visible number of BDS satellites,and significantly reduce the PDOP value.The accuracy improvement of BDS pseudo-range single point positioning is at the decimeter level,the horizontal positioning accuracy is improved by more than 13%,and the vertical positioning accuracy is improved by less than 10%.