不同卫星高度角对GPS/GLONASS/BDS/Galileo融合定位的影响  

The influence of different satellite altitude angles on GPS/GLONASS/BDS/Galileo fusion positioning

作　　者：覃继前 徐宁辉 梁月吉 QIN Jiqian;XU Ninghui;LIANG Yueji(Nanning Surveying and Mapping Geographic Information Institute,Nanning 530001,China;College of Geomatics and Geoinformation,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]南宁勘察测绘地理信息院,南宁530001 [2]桂林理工大学测绘地理信息学院,广西桂林541004

出　　处：《全球定位系统》2021年第2期62-68,共7页Gnss World of China

基　　金：广西空间信息与测绘重点实验室项目(16-380-25-22)。

摘　　要：研究不同卫星高度角对GPS/GLONASS/BDS/Galileo(G+R+B+E)融合定位的影响,并建立了相应的模型.采用MGEX(Multi-GNSS Experiment)提供的全球卫星导航系统(GNSS)数据,经理论分析和算例表明:G+R+B+E组合使得参与定位的有效卫星增多,在不同的卫星高度角下均能保证较多的卫星数,保证较好的空间几何分布结构;组合系统达到一定的卫星数后,卫星高度角对定位结果影响不大;当卫星高度角大于30°时,相对于单一的GPS定位G+R+B+E在3D方向的外符合定位精度有所改善.This paper studied the offects of different satellites elevation on GPS/GLONASS/BDS/Galileo(G+R+B+E)fusion positioning and corresponding model was established.Using global navigation satellite system(GNSS)data provided by MGEX(Multi-GNSS Experiment),the theoretical analysis and experiments showed that,combination of G+R+B+E increased the number of satellite used for positioning,and could ensure a relative large number of satellites and a good space geometric distribution structure.Satellites elevation had little effect on positioning result when the satellites of combined system reached a certain number.External error accuracy of G+R+B+E combination in 3D direction was improved when satellites elevation was larger than 30°.

关 键 词：卫星高度角 多系统 卫星可见数 位置精度衰减因子(PDOP) 精度分析 

分 类 号：P228.4[天文地球—大地测量学与测量工程]