近程SAR图像中的地面运动目标检测

探讨了单天线单通道近程合成孔径雷达(SAR)中的地面运动目标检测问题。利用KEYSTONE变换完成地面运动目标线性距离走动的校正，利用DECHIRP处理完成SAR聚焦后信号的Radon—Wigner变换，实现对运动目标信号的“聚集”。根据近程SAR的特点，在多卜勒频率-调频率平面将地面静止目标信号和运动目标信号分离并采用CLEAN技术，去除强静止目标信号对弱运动目标信号检测的影响，从而对运动目标信号进行有效的检测。仿真和实测数据的处理结果表明了这种方法的有效性。

On Detecting Effectively Ground Moving Target with Single-Antenna-Single-Channel Short-Range SAR

The present method in China for detecting ground moving target with single antenna single channel short range SAR (Synthetic Aperture Radar) is just beginning. We combine present technological advances in the last decade or so--KEYSTONE transform, Radon Wigner transform, and CLEAN technology--in a synergistic way to achieve effective detection of ground moving target with single antenna single channel short range SAR. Section 1 reviews briefly relevant known information that is needed by our synergistic combination. Section 3 explains our synergistic combination in some detail; essentially our synergistic combination includes three parts: (1) We use KEYSTONE transform to correct the linear range migration of ground moving target; (2) we implement Radon Wigner transform of focused SAR signal with DECHIRP processing; (3) we use CLEAN technology to suppress the effect of strong ground stationary target clutters. Numerical simulation results, as shown in Figs.2, 3, 4 and 5, show preliminarily that our method is effective. Our method has been successfully used in the processing of real single antenna single channel short range SAR data.