GPS静态精密单点定位算法研究与精度分析

Research on algorithm and precision analysis of GPS static precise point positioning

为了提高GPS静态精密单点定位的精度,提出GPS静态精密单点定位的数学模型、参数估计及误差处理方法:利用IGS提供的7d10个具有代表性跟踪站的观测数据进行实验,采用双频无电离层组合观测模型消除电离层延迟误差一阶项;在数据预处理阶段进行钟跳探测与修复,使用卡尔曼滤波进行参数估计。结果表明:E、N较U方向误差小,U方向达到cm级,E、N方向甚至达到mm级;由此可知GPS静态精密单点定位的定位精度可以达到cm级至mm级。

In order to improve the accuracy of GPS static precise point positioning, the paper proposed the mathematical model, the motbods of parameter estimation and error processing： experiment with observation data of 10 representative tracking stations of ？ days from IGS was carried out, in which double frequency non ionosphere combined observation model was adopted to eliminate the first order term of the ionospheric delay error, clock jump detection and repair in data preprocess- ing stage was used, and Kalman filter was utilized to estimate the parameters. Result showed that the error of U direction could be larger with centimeter level than that of N, E directions with even both millimeter level. Thus, the accuracy of GPS static precise single point positioning could reach the level of centimeter to millimeter.