摘要
给出了存在多径效应时的GPS接收信号模型,分析了多径干扰对GPS接收机跟踪环路的影响.将均衡技术应用于跟踪环路,提出了一种GPS信号多径干扰抑制方法.该方法在GPS信号跟踪环路中引入了判决反馈分数间隔均衡器,同时,根据GPS信号为BPSK调制且发送的伪码序列被导航电文调制后存在正负反转不确定性的特点,均衡器系数更新时选用MCMA盲均衡算法.仿真结果显示,该方法能够有效消除多径影响,验证了算法的正确性和可行性.
The model of GPS signals is given in the multipath environment,and the multipath effects to tracking loop in GPS receiver are analyzed.A multipath mitigation method of GPS signals is proposed using equalization technology in tracking loop.In this method,fractionally spaced blind decision feedback equalization is applied.Meanwhile,because GPS signals are BPSK signals and the illegibility of C/A codes appears when C/A codes are modulated with navigation data,the coefficients of the equalization are updated with modified constant module algorithm.Simulation results show that the method can mitigate the multipath effects effectively and feasibility of the method is validated.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2011年第1期46-52,共7页
Acta Electronica Sinica
关键词
GPS接收机
跟踪环路
多径干扰
盲判决反馈均衡
修正常模算法
GPS receiver
tracking loop
multipath effects
blind decision feedback equalization
modified constant module algorithm
