基于MATLAB的BDS单点定位程序设计及精度分析

Design and Accuracy Analysis of BDS Single Point Positioning Program Based on MATLAB

本文系统地研究了北斗卫星导航系统(BDS)伪距单点定位的相关理论与方法,利用误差改正后的观测方程进行伪距单点定位,并对电离层误差、对流层误差、多径效应误差、卫星星历误差等进行改正。利用MATLAB软件编写数据处理程序,得到xls和txt格式的坐标、残差数据、残差图以及卫星的PDOP图、GDOP图、HDOP图和VDOP图。使用上海佘山国际GPS服务(IGS)观测站的数据进行精度实验,对相关数据进行了计算,得到了有关差值数据的相关统计,并结合中误差以及残差情况分析计算结果。计算结果表明,该数据处理程序在X方向上的定位精度在15 m以内,在Y方向和Z方向上的定位精度都在10 m以内。

The theory and method of Beidou Navigation Satellite System(BDS) pseudo range single point positioning was systematically studied in this paper and the corrected observation equation was applied. The impacts on the position of error sources such as ionospheric error, tropospheric error, ephemeris error, satellite clock error, multi-path effects and relativistic effect were analyzed and corrected. The data from IGS observation station in Shanghai Sheshan was used to the positioning precision experiment. The data processing software Matlab was compiled to get coordinate and error files of xls and txt format, bias figure, mean square figure, PDOP figure, GDOP figure, HDOP figure, VDOP figure. The results show that the positioning precision using the software reaches 10 m in the X direction,10 m in the Y direction and 15 m in the Z direction.