时域物理光学法计算目标的微波短脉冲散射

目标的短脉冲散射问题本质上是其宽带散射特性,从时域上获取短脉冲散射问题更为直接。时域物理光学方法具有计算速度快、物理近似意义清晰明确等特点,可直接计算电大尺寸目标的微波短脉冲散射的时域波形。介绍了时域物理光学的理论公式,通过三角型网格剖分建立目标模型,引入Radon 变换计算目标的“冲击响应”,利用卷积计算获得目标的微波短脉冲散射时域波形。通过仿真算例进行验证,计算双导体球模型散射回波验证了该方法的可行性;计算大飞机的微波短脉冲散射波形展示了该方法处理电大尺寸问题的能力。用该方法计算的目标短脉冲散射回波波形可直接作为信号处理研究的输入。

Calculation of Scattering for Target Microwave Short Pulse by Time-Domain Physical Optics Method

The problem of short pulse scattering from target is wide-band scattering characteristic, essentially. And, it is more straightforward to obtain short pulse scattering from the time domain. The time-domain physical optics (TDPO) method has the characteristics of fast speed and clear physical approximation, which can be used to calculate the time domain waveform of microwave short pulse scattering from the large size target directly. Theoretical formula of TDPO is introduced in this paper, and the target model is established based on triangular mesh. Radon transform is utilized to calculate the impulse response of the target. Therefore, microwave short pulse scattering of targets in time domain is obtained by convolution. The method is verified by the scenario of calculating the scattering echo of the two-conductor sphere. And the short pulse scattering waveform of large aircraft is calculated to show the ability to deal with electrically large problem. The short pulse scattering waveform from target can be used as the input of signal processing research.