分析了多径效应对伪码扩频测距精度的影响，研究了航天测控系统中多径信号的特征，建立了系统的信道模型。利用MATLAB搭建仿真平台，比较了不同环境下多径效应对测距精度的影响。仿真结果表明：测距误差的均值和抖动随着信噪比的增大而减小，莱斯因子越大，测距误差的均值越小；而多径信号的相对延迟越大，多径信号的数量越多，测距误差的抖动越大。%The influence of multi-path effect in pseudo-noise spread spectrum ranging system is analyzed, the characteristic of multi-path signals in space track telemetry and command( TT&C) system is studied, and the relevant channel models are introduced. Based on MATLAB,a simulation platform is developed,on which ranging accuracy performance simulations and analysis are carried out in different environments. The results show that,the mean and jitter of ranging error decrease with the increase of signal-to-noise ratio ( SNR);when the Ricean factor increases,the mean of ranging error decreases;and the jitter of ranging er-ror increases when multi-path delay or number of multi-paths increases.
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