高遮挡环境下卫星数不足四颗的GPS定位研究  

Study of GPS Positioning Algorithm with Insufficient Visible Satellites

作　　者：刘涛 于兴旺[2] 

机构地区：[1]新疆维吾尔自治区第二测绘院,新疆乌鲁木齐830002 [2]武汉大学测绘学院,湖北武汉430079

出　　处：《全球定位系统》2007年第5期24-28,共5页Gnss World of China

摘　　要：讨论了GPS接收机观测卫星数不足4颗条件下的GPS导航定位问题,提出拟合外推接收机钟差,联合大地高,地图匹配的方法,推导了相应的数学模型,并编程实现其算法,对实际车载动态GPS数据进行解算。解算结果表明:利用上述方法可以解决观测卫星数不足4颗条件下的GPS导航定位问题。This paper discusses the GPS navigation and positioning algorithm that visible satellites number is less than four. Extrapolating the receiver clock error fitting, joint priori ellipsoid height and map-matching, these three aided methods are proposed in this paper. Their mathematic models are deduced, and program based on these algorithms is implemented with GPS data collected by a moving car in urban canyon. The results indicate that using the proposal method can provide navigation location even under the condition of insufficient visible satellite.

关 键 词：GPS 卫星数不足 接收机钟差拟合 大地高 地图匹配 

分 类 号：P228[天文地球—大地测量学与测量工程]