基于历元间差分技术的精密单点定位研究

The Research on Precise Point Positioning Based on the Epoch-difference

无模糊度模型的精密单点定位,通过历元间相位差分,消除初始相位模糊度来求取历元间位置差。本文基于抗差估计,讨论了历元间伪距、相位差分技术以及参数的估计方法。赋予伪距、相位观测值不同的初始权,然后采用抗差估计原理进行位置差参数估计。分析了不同采样率对位置差结果的影响,采用小波分析理论对位置差误差的特性进行了研究。探讨了采用历元间差分获得的位置差进行单点定位时存在的一些问题。

The ambiguity free model of precise pointing can eliminate the ambiguity parameter,because the method of Epoch-difference of phase is used. The estimation parameters of this model are the position difference. Based on the robust estimation,this paper discusses the analyses the effects of the sample interval on the results of position-difference. The characterization of position-difference error is studied using wavelet analysis. According to the characterization of errors,some key problems that happen using the method of Epoch-difference to position are also studied.