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本文研究GPS系统中多径效应引起的伪距测量误差．先分析镜面多径信号的时间延迟和由此引起的频带扩展，然后研究在用相于和非相于延时销定环跟踪PN码信号时多径信号对S曲线的影响和由此带来的伪距测量误差（多径误差），以及减小多径误差的方法．
This article studies the pseudo-range measurement error caused by multipath effect in GPS system. Firstly, the time delay of the mirror multipath signal and the band expansion caused by the multipath signal are analyzed. Then, the influence of the multipath signal on the S-curve and the consequent impact on the S-curve when the PN code signal is tracked by the phase-locked and non- Of the pseudorange measurement error (multipath error), and reduce the multipath error method.