GPS接收机的定位误差分析

基于Superstar Ⅱ GPS接收机和MATLAB实验平台,实现了所有星座误差及信道误差的修正.重点分析了卫星钟差、电离层误差、对流层误差、地球自转效应等误差及修正方法.参照IGS精密星历,利用Klobuchar模型,电离层误差修正掉约14 m;利用高度角模型,对流层误差平均修正掉4.05 m;地球旋转效应误差最大修正掉约30 m;卫星钟差修正后不超过3.1 m.实验结果最终定位精度17 m,验证了误差修正方法的正确性,为今后进行的GPS接收机研制工作积累了经验.

Positioning Error on GPS Receivers

The paper completed all the correction of constellation error and receiver channel error based on Superstar II GPS receiver and MATLAB.It mainly corrected the position error such as satellite clock error,ionospheric error,tropospheric error,and the earth rotation effect.Moreover,ionospheric delay error is corrected for about 14 m by Klobuchar model;tropospheric error is corrected for the average value of 4.05 m by the altitude angle module and so on.Especially,the satellite clock error is corrected for 3.1 m related to IGS by empirical formula.Finally,these methods have improved the positioning precision to 17 m.The result of experiment has proved the validity of these correcting methods,accumulating much experience for the next investigation.