多径干扰下扩频导航信号伪码跟踪性能仿真研究

分析了多径环境下扩频导航接收机伪码信号跟踪性能.主要分析了时延绝对值小于一个码片的多径信号对导航信号伪码相位跟踪误差的影响,给出了接收机伪码跟踪环的结构框图,并建立了环路的数学模型,在考虑多径信号的基础上分析了混合信号相位跟踪的数学模型,分析了混合信号下伪码跟踪环相位跟踪的性能.在数学模型分析的基础上对存在单路多径信号时伪码相位跟踪性能进行了计算机仿真,并运用Matlab中的Simulink进行了具体的实现.

Research and Simulate on Code Tracking Performance of DS/BPSK Navigation Signal in Multipath Interface

The signal code tracking performance of DS/BPSK navigation receiver on multipath environment was researched in the paper. The influence of multipath signal whose delay was smaller than 1 chip to the PN code tracking error and carrier tracking error was analyzed. The hardware implementation of the signal code scheme was provided,and the mathematics mode of the signal tracking system was presented. The phase tracking and measurement performance was analyzed when the receiver signal was composite signal. Based on the analysis of tracking mathematics,some simulations of the code tracking loop performance were given,and the code tracking loop through the Simulink of Matlab was built up.