高度角定权模型的BDS/GPS伪距单点定位分析

摘要

为了提高BDS/GPS组合定位的精度,分别采用不同高度角定权模型计算BDS/GPS组合定位结果,论述BDS/GPS组合系统的伪距单点定位解算模型、重要误差改正方法及高度角定权和单位阵定权的理论模型,探讨BDS、GPS和BDS/GPS组合系统在卫星观测数量、PDOP值及伪距单点定位精度上的差异,比较分析应用不同定权模型的BDS/GPS组合定位结果.实验结果表明:BDS/GPS组合定位的精度高于BDS的定位精度,GPS伪距单点定位的精度略优于BDS;采用不同高度角定权模型的BDS/GPS组合定位结果精度不同.%In order to improve the accuracy of BDS/GPS combined positioning, the paper used different weight matrix models of elevation angles to calculate the BDS/GPS combined positioning, expounded the calculation model of pseudorange point positioning of the BDS/GPS combined system, the correction method of important errors, and the theoretical models of the weight matrix algorithm of elevation angles and the weight matrix algorithm of unit array, discussed the differences of the observation number of the satellites, the value of PDOP and the precision of pseudorange point positioning between BDS, GPS and BDS/GPS combined system, and comparatively analyzed the application of different weight models in BDS/GPS combined positioning.Experimental result showed that the precision of BDS/GPS pseudorange point positioning would be higher than that of BDS, while the precision of GPS pseudorange point positioning would be slightly better than that of BDS, and the precision of BDS/GPS combined positioning with different elevation angles weight matrix models would be different.