超宽带无线电引信回波信号建模与仿真

由于超宽带信号辐射、地面散射特性及超宽带无线电引信回波信号频率等原因，超宽带无线电引信回波信号经常被淹没在噪声中。为了得到超宽带无线电引信回波信号，从超宽带信号的多径效应出发，推导出了超宽带无线电引信回波信号数学模型，并通过时域分析法及Matlab进行仿真。仿真结果表明：由于引信天线波束照射范围内距离不同导致地面散射信号返回到天线的时间不同，从而造成展宽效应，并且随着高度不断增加，展宽效应更加明显；随着高度的增加，超宽带无线电引信回波信号幅度相应变小。通过与实测波形比较，验证了建模的正确性。

Modeling and Simulation of Echo Signal of Ultra-wideband Radio Fuze

The target signal of ultra-wideband radio fuze is always submerged in the noise due to the signal radiation of ultra-wideband, surface scattering and target signal frequency of ultra-wideband radio fuze. In order to get the echo signal of ultra-wideband radio fuze, the target signal mathematical expressions of ultra-wideband radio fuze are derived by starting from the diffuse reflection characteristics and multipath effects of ultra-wideband signal. The target signal of ultra-wideband radio fuze is simulated with the help of time domain analysis and Matlab. The simulation results show that the time for scattered signal returning to the antenna is different because of the distance from fuze antenna to the antenna beam is different, resulting in broadening effect. The broadening effect is more obvious with the increase in height；the amplitude of ultra-wideband radio fuze echo signal decreases with the increase in height. The correctness of the model is verified by comparing with the measured waveform.