GPS接收机跟踪环的多径误差分析

Analysis of Multipath Error in GPS Receiver Tracking Loop

基于典型的GPS接收机跟踪环 ,研究了多径效应导致的码相跟踪误差和载波相位跟踪误差 ,得出了码相跟踪误差和载波相位跟踪误差与多径参数的解析表达式。计算机仿真表明 ,码相跟踪误差和载波相位跟踪误差随多径信号的幅度的增大而增加 ;码相跟踪误差和载波相位跟踪误差与多径信号的相位呈周期性变化 ;载波相位跟踪误差随多径延迟的增加而减少。

In this paper,code phase tracking error and carrier phase tracking error due to multipath effects are studied based on typical GPS receiver tracking loop.Tracking errors as functions of mulipath parameters, are derived mathematically. It is shown that code phase tracking error and carrier phase tracking error increase as the amplitude of multipath signal increases; code phase tracking error and carrier phase tracking error are periodic with the phase of multipath signal; carrier phase tracking error decreases as the multipath delay increases.The above theoretical analysis has been validated by computer simulation.