GNSS接收机中多径效应引起的误差分析和减小误差的策略
首发时间:2012-07-03
摘要:多径效应影响着接收机跟踪环路的码相位和载波相位的鉴别结果,并对接收机的定位结果造成一定程度上的影响,本文针对多径效应引起的码相位误差和载波相位误差进行了具体的分析,在Matlab下对不同的仿真条件完成相应的仿真,从而得出反射信号的幅度、延迟、相关间隔以及载波相位对码环鉴别器误差的影响的结论,同时在该结论的基础上对strobe和窄相关算法进行仿真,在仿真结果的基础上提出了一种减小多径误差的方法,提高了GNSS接收机跟踪的精度。
关键词: 导航接收机 多径;码环;锁相环;
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An analysis of error caused by multipath effect in GNSS receivers and a method to minish the error
Abstract:Multipath affects the discrimination of code phase and carrier phase of tracking in GPS, making some difference to the orientation of our receivers. This paper analyses the error caused by multipath effect, does some simulations in matlab according to different conditions,and makes a conclusion that range,delay and interval of reflected signal and carrier phase have effect on the result of DLL.At the same time, this paper also puts forward a method to minish the error due to the multipath, which, in return, improves the accuracy of tracking in GNSS receiver.
Keywords: GPS Receiver,multipath,DLL,PLL
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