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在短波移动通信设备研制过程中,信道模拟器可以缩短研制周期,节省研发费用,起着不可替代的作用.从理论上分析了多径效应对无线信道的影响和典型时变多径衰落信道的理论模型.研究了基于ITS模型的短波信道模拟器抽头延迟结构,在此基础上建立了抽头延迟线(TDL)的仿真模型,并且借助SCASDR的开发工具软件SpectraCx,在软件无线电平台上对该模型进行了实现.测试结果与仿真波形比较可得出,在基于SCA2.2规范的SDR平台上可以实现两路输出,延迟为1.3ms的多径延时效应的模拟.“,”In the development process of shortwave mobile communication equipment, channel simulator can shorten the de- velopment cycle and save the development cost, and plays an irreplaceable role. Firstly, this paper analyzes the influence of multi - path effect on wireless channel in theory in the context, and the theoretical model of typical time - varying multi - path fading channel is analyzed. Then TDL in channel simulator based on ITS model is represented, and as well as the tap - delay - line simu- lation model. Making use of SCA SDR development tool Spectra Cx, the model is realized in the Software Definition Radio Platform based on SCA2.2 standard. Moreover, compared the results of testing with simulation shows, it shows the design can simulate multi - path delay effect in two - paths and 1.3ms of delay time in the SDR platform based on SCA2.2 standard.