单差PPP相位偏差估计方法及有效性分析

摘要

At present, slow convergence of traditional precise point positioning (PPP) with float ambiguity prevent the wide application in various fields. And the uncalibrated phase biases originating in receivers and satellites prevent the integer ambiguity resolution of PPP, so it can not be directly fixed by using carrier wavelength. In order to solve this problem, an estimation model based on directional statistics is proposed. Then the validity of the phase bias correction for PPP fixed solution is analyzed in terms of the reliability of ambiguity resolution, convergence speed and positioning accuracy. The results show that both reliability of ambiguity resolution and convergence speed of PPP with phase bias correction are improved, and the accuracy of PPP fixed solution can be improved by one order of magnitude.%针对常规浮点解精密单点定位收敛时间长的问题,分析了PPP模型中模糊度不具备整数性质的原因,采用方向数据统计的计算方法,以单差模糊度为研究对象,对相位偏差进行了建模估计.算例从精密单点定位单差模糊度固定、定位精度以及收敛速度等方面对相位偏差改正的有效性进行了分析,结果表明,经相位偏差改正后的PPP模糊度固定成功率、收敛速度有了明显提高,定位精度较浮点解提高了一个量级.