A broadband signal of 100 kHz is divided into some narrowband signals in frequency domain and the modulated signals are added up after Wattcrson channel to turn the narrow - bandwidth signals into a broadband signal in this paper. In other words, signal is broadband in the launch and receiver but narrow in the ionospheric channel. In addition, the influence of the two channels on the signal are compared and analyzed after putting the broadband multicarrier modulation signal into ITS channel model directly to provide the next step of radar signal processing simulation a platform.%将带宽100kHz的宽带信号在频域上分割成窄带信号,利用Watterson信道实现窄带信号的传输建模,在接收端对信号合成,从而转化为宽带信号.换言之,在发射端和接收端,信号是宽带的；在空间信道中,信号是窄带的.另外,将由多载波调制后的窄带信号合成后得到的100 kHz的宽带信号宽带直接通过ITS信道模型建模,比较和分析了两信道对信号的影响,为下一步雷达信号处理提供了仿真平台.
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