Characteristic analysis of echo signal of typical backdoor coupling target
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摘要: 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。Abstract: 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.
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Key words:
- backdoor /
- strong coupling /
- echo signal /
- characteristics /
- simulation
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图 2 简化机箱模型仿真平面波辐照和边界条件设置
Figure 2. Model simulation settings for the simplified chassis
图 5 机箱回波信号及耦合场强频域仿真图
Figure 5. Frequency domain simulation diagram of chassis echo signal and coupling field strength
图 7 放大机箱回波信号及耦合场强频域仿真波形
Figure 7. Frequency domain simulat results amplified chassis echo signal and coupled field strength
图 9 方形机箱回波信号及耦合场强频域仿真波形
Figure 9. Frequency domain simulation results of the square chassis signal and coupled field strength
图 11 激励及机箱耦合场时域波形(弱耦合)
Figure 11. Excitation and chassis coupling field time domain waveform (weak coupling)
图 12 8 GHz与8.5 GHz机箱回波时域波形(弱耦合)
Figure 12. 8 GHz vs. 8.5 GHz chassis echo time domain waveform (weak coupling)
图 13 放大机箱2.2 GHz强耦合时域波形
Figure 13. Time domain strong coupling waveform of enlarged chassis at 9 GHz
图 14 放大机箱1.8 GHz弱耦合时域波形
Figure 14. Time domain weak coupling waveform of enlarged chassis at 1.8 GHz
图 15 方形机箱5.5 GHz强耦合时域波形
Figure 15. Time domain strong coupling waveform of square chassis at 5.5 GHz
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