In this letter, we propose an inverse synthetic aperture radar (ISAR) imaging method using time-domain (TD) scattering echo simulated by time-domain physical optics (TDPO) method. First, the TD pulse plane wave is taken as the incident wave and the transient scattering echo data matrix is obtained by using the TDPO method under different look angles of the target. Then, demodulation, pulse compression, and azimuth inverse fast Fourier transform (FFT) are performed on the echo data matrix to obtain the ISAR image under small bandwidth small angle. In this letter, considering the fact of TD pulse signals emitted by radar, electromagnetic scattering modeling method is adopted to obtain more accurate TD scattering echoes. This method combines the electromagnetic scattering algorithm and radar imaging algorithm effectively and is closer to practical application. Finally, ISAR images are given to verify the feasibility and fidelity of the presented method.

中文翻译：

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TDPO法模拟时域散射回波的ISAR图像算法

在这封信中，我们提出了一种使用时域物理光学 (TDPO) 方法模拟的时域 (TD) 散射回波的逆合成孔径雷达 (ISAR) 成像方法。首先，将TD脉冲平面波作为入射波，利用TDPO方法得到目标不同视角下的瞬态散射回波数据矩阵。然后对回波数据矩阵进行解调、脉冲压缩和方位角逆快速傅里叶变换（FFT），得到小带宽小角度下的ISAR图像。在这封信中，考虑到雷达发射TD脉冲信号的事实，采用电磁散射建模方法来获得更准确的TD散射回波。该方法有效地结合了电磁散射算法和雷达成像算法，更接近实际应用。最后，给出ISAR图像以验证所提出方法的可行性和保真度。