基于最大似然多径估计的卫星导航信号码跟踪算法与实现

卫星导航接收机需要精确的估计信号的扩频码相位并进行跟踪，估计的精度直接影响 伪距的测量精度。卫星信号的多径传播使得传统的基于DLL的估计器存在较大误差，提 出了一种抗多径的估计算法，它基于最大似然参数估计方法，并给出了该算法的推导过程， 仿真的结果表明该算法比传统的DLL跟踪环在性能上有很大的改进。结合传统卫星导 航接收机的实现结构，给出了一种整合了该算法的实现方案。

MLE-Based Algorithm and Implementation to Mitigate Multipath Effects in Satellite Navigation Receiver

Satellite navigation receivers requires to track code phase of satellite's signal precisely because it affects the precision of pseudo-range directly.However,the multipath effect introduces quite big errors to the traditional DLL-based estimators.This paper proposed a new estimation algorithm for multi-path parameter which is based on mostly likelihood parameter estimation.The proposed algorithm is formulated in detail.Simulation results show that it greatly improves the performance of code phase estimation compared with DLL-based algorithm.The paper also proposed an implementation scheme that can be integrated into classical GPS/GNSS receivers to enhance their performance.