一种基于小波变换的伪码跟踪环路多径抑制方法

多径效应是GPS等卫星导航系统的重要误差源之一，严重影响导航系统的性能。针对多径效应，在分析了多径信号模型和伪码自相关函数特征的基础上，提出了一种基于小波变换的多径抑制方法。该方法利用自相关函数曲线斜率突变点位置不受多径信号影响的特性，通过小波变换检测其斜率突变点位置，进而利用得到的鉴相误差调整码相位，达到多径抑制的目的。仿真结果表明，该方法不受多径条数的影响，鉴相结果更准确，多径抑制能力得到显著提高。

A Novel Method of Multipath Mitigation for PN Code Tracking Loop Based on Wavelet Transform

Multipath is one of main errors in GPS and other satellite navigation systems, it seriously affects the performance of the navigation receiver. In this paper, a novel method of multipath mitigation is proposed based on the analysis of multipath signal model and the characteristics of the pseudo\|code autocorrelation function. The method is supported by the character that the jump point position of the autocorrelation function’s slop isn’t affected by the multipath signals, the position is detected by using wavelet transform, then the discriminator result is got to adjust the code phase to achieve the purpose of multipath mitigation. Theoretical analysis and simulation results show that the method is not restricted by the number of multipaths, discriminator results are more accurate, the capability of multipath mitigation is significantly improved.