强背景杂波下的地面运动目标干涉式三维成像
doi: 10.3724/SP.J.1146.2005.00590
Three-Dimensional Interferometric Imaging of a Moving Ground Target in Strong Background Clutters
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摘要: 基于逆合成孔径雷达(ISAR)成像与干涉式测角原理的结合，该文提出一种地面运动目标的干涉式雷达三维成像方法。利用获得的角运动参数对回波信号在原始数据域进行补偿，完成对应干涉天线上的复图像对准。按照目标散射中心点的空间位置，重构运动目标的三维图像。该文提出的基于线性调频信号拉伸处理的杂波剔除方法，在用干涉技术进行三维成像之前剔除强背景杂波，方法简单易于工程实现。仿真结果证明了该方法的有效性。Abstract: Based on the principles of ISAR and interferometric observation, a three-dimensional (3D) imaging method of Interferometric ISAR (InISAR) is developed. Making use of compensation of the resultant angular motion parameters for the echoes in the raw data level, two complex images from interferometric antennas are, sequentially, co-registered. A 3D image of a moving target is reconstructed from the spatial coordinates of these scatter centers of the target. Also, a stretch processing of LFM signal to remove the background clutter is discussed. This method is simple and easily implemented in engineering. Simulations show that this 3D imaging method works well even for a moving target in strong clutters.
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