GPS精密卫星钟差估计研究

Study on GPS Precise Satellite Clock Error Estimation

随着精密单点定位技术的发展,对于精确的卫星坐标以及卫星钟差改正精度的要求越来越高,精密卫星星历以及精密卫星钟差的求解成为制约精密单点定位技术发展的瓶颈。本文基于修复周跳的载波相位观测值与相位平滑伪距观测值,采用无电离层延迟星间单差精密卫星钟差估计模型,在先估计出整周模糊度后,进行了精密卫星钟差的估计,并采用与IGS事后精密钟差作二次差的方法进行精度分析,这对于提高精密单点定位精度具有一定的意义。

With the development of Precise Point Positioning,the accuracy of precise satellite coordinates and satellite clock error correction were increasingly high demand.Precise satellite ephemeris and precise satellite clock error solver has become the bottleneck problem of the development of precise point positioning.Based on repaired cycle slip carrier phase observations and phase smoothing pseudorange observations,using no ionospheric delay single difference between satellites precise satellite clock error estimation model,previously estimated ambiguity,estimated precise satellite clock error,and carry out precision analysis using the method of doing the second difference with IGS post precise clock error,it is significant for improving the accuracy of precise point positioning.