精密单点定位中相位偏差估计与修正方法研究

Estimation and modified method of phase biases for precise point positioning

本文针对相位偏差对精密单点定位(Precise Point Positioning,PPP)的影响,分析了PPP模型中相位偏差估计的原则,并给出了宽巷和L1相位偏差的估计方法;对相位偏差小数提取过程中整数不一致以及偏差小数值存在正负差异的两个问题进行了修正。算例从相位偏差时间和空间一致性两方面进行了分析,结果表明宽巷相位偏差具有较高的时间和空间一致性,单个站点相位偏差与其均值最大差值为0.050周;L1相位偏差受无电离层模糊度影响较为严重,其空间一致性较宽巷相位偏差稍差些,但基本控制在0.180周以内,可用于PPP模糊度的相位偏差改正。

According to the effect of phase biases on PPP, the paper analyzed the phase-biases estimation principles in PPP model, and gave the estimation method of wide-lane and L1 phase biases, modified the inconsistency of integer and sign of phase biases fraction. Finally, the example was analyzed in terms of the time and spatial consistency of phase biases, and the results showed that the wide lane phase biases would have better time and spatial consistency, with a maximum difference of 0. 050 cycles. Compared with wide-lane phase biases, L1 phase biases would have lower time and spatial consistency, which was less than 0. 180 cycles. So it is available for the correction to phase biases of PPP ambiguity.