知识与财富的链接
针对多径环境下直扩(DS-SS)信号的伪码跟踪问题,对延迟锁定环(DLL)进行了研究.在考虑多条路径干扰信号的情况下分析了多径效应对DLL鉴相特性的影响.为了消除DLL中的多径和噪声干扰,采用一种基于卡尔曼滤波的最大似然多径估计方法对DLL进行了改进.该方法通过对最大似然估计的输出进行卡尔曼滤波,得到了较为准确的多径幅...
For tracking the PN code of direct-sequence spread-spectrum(DS-SS) signals under multipath environment,the delay locked loop(DLL) is studied.In the case of existing multipath interference,the analysis on phase-detecting characteristic of DLL is given.In order to eliminate the multipath and noise interference on DLL,Kalman filter is used to filter the noise from the output of maximum likelihood estimation(MLE),and then the more accurate multipath magnitude and delay are got.Finally,the phase-detecting charac...
