北斗单点定位的误差补偿方法

Error Compensation Method of Beidou Single Point Positioning

北斗是我国自主研制的卫星导航定位系统,当前北斗的单点定位精度优于10m。为提高该系统的定位精度,必须对由其误差源引起的定位误差进行修正。基于对北斗卫星导航系统的组成、定位算法及定位误差的认识,对导航系统定位中星历误差、电离层误差和对流层误差进行了深入分析,提出了减小星历误差的曲面模型、减小电离层误差的双频组合消电离层模型和减小对流层误差的高精度区域融合模型的单点定位误差补偿方法,并应用Matlab软件对修正模型方法进行仿真计算。对比修正前后的定位结果,修正后的定位误差更小,证明了所提出的修正模型是可行的。

Beidou is a satellite navigation and positioning system independently developed in China.At present,the single point positioning accuracy of Beidou is better than 10 m.To improve the positioning accuracy of the system,the positioning error caused by its error source must be corrected.Based on the understanding of the composition,positioning algorithm and positioning error of Beidou satellite navigation system,the ephemeris error,ionosphere error and troposphere error in the positioning of the navigation system is analyzed in this paper.A single point positioning error compensation method is proposed,which contains the curved surface model to reduce the ephemeris error,the dual frequency combined ionosphere model to reduce the ionosphere error and the high-precision regional fusion model to reduce the troposphere error,and this corrected model method is simulated and calculated by Matlab.Compared with the location results before and after the correction,the location error after the correction is smaller,which proves that the proposed corrected model is feasible.