典型后门耦合目标回波信号特性分析

Characteristic analysis of echo signal of typical backdoor coupling target

构建了典型后门耦合目标,从时域和频域两个维度对目标进行了回波特性仿真,发现目标的孔缝-腔体结构出现强耦合时回波频域波形可观察到幅度凹坑,且强耦合频率时的回波时域波形呈双峰状,与非强耦合回波存在明显差异。通过改变后门耦合目标尺寸和形态仿真验证了所发现的回波信号特征规律,利用发现的回波信号特征规律可从回波信号中提取出未知目标腔体后门强耦合微波参数。

In this paper,a typical backdoor coupled target is constructed,and the echo characteristics of the target are simulated from two dimensions of time domain and frequency domain.It is found that amplitude pits can be observed in the echo frequency domain waveform when the aperture-cavity structure of the target is strongly coupled,and the echo time domain waveform when the aperture-cavity structure is strongly coupled is bimodal,which is obviously different from the non-strongly coupled echo.By changing the size and shape of the backdoor coupled target,the characteristic law of the echo signal is verified by simulation.