Dept. of Electr. and Comput. Eng., State Univ. of New York, Amherst, NY.
IEEE Trans Image Process. 1993;2(1):80-95. doi: 10.1109/83.210868.
A synthetic aperture radio/inverse synthetic aperture radar (SAR/ISAR) coherent system model and inversion to image a target moving with an unknown constant velocity in a stationary background are presented. The approach is based on a recently developed system modelling and inversion principle for SAR/ISAR imaging that utilizes the spatial Fourier decomposition of SAR data in the synthetic aperture domain to convert the SAR system model's nonlinear phase functions into linear phase functions suitable for a computationally manageable inversion. It is shown that SAR/ISAR imaging of a moving target can be converted into imaging the target in a stationary squint-mode SAR problem where the parameters of the squint-mode geometry depend on the target's velocity. A method for estimating the moving target's velocity that utilizes a spatial Doppler analysis of the SAR data within overlapping subapertures is presented. The spatial Doppler technique does not require the radar signal to be narrowband, so the reconstructed image's resolution is not sacrificed to improve the target's velocity estimator.
提出了一种用于对在静止背景中以未知常速运动的目标成像的合成孔径无线电/逆合成孔径雷达（SAR/ISAR）相干系统模型和反演方法。该方法基于最近开发的用于 SAR/ISAR 成像的系统建模和反演原理，该原理利用 SAR 数据在合成孔径域中的空间傅里叶分解将 SAR 系统模型的非线性相位函数转换为适合于可计算管理的反演的线性相位函数。结果表明，可以将运动目标的 SAR/ISAR 成像转换为在斜视模式 SAR 问题中对目标成像，其中斜视模式几何形状的参数取决于目标的速度。提出了一种利用 SAR 数据在重叠子孔径内的空间多普勒分析来估计运动目标速度的方法。空间多普勒技术不需要雷达信号为窄带，因此不会牺牲重建图像的分辨率来提高目标速度估计器的性能。
