一种多目标ISAR成像方法  

A Mehtod of Multi-target ISAR Imaging

作　　者：孔令坤[1] 张伟[1] 张顺生[1] 周宝亮[1] 

机构地区：[1]电子科技大学电子科学技术研究院,成都611731

出　　处：《现代雷达》2011年第1期37-40,46,共5页Modern Radar

基　　金：电子科技大学中青年学术带头人基金资助项目

摘　　要：在逆合成孔径雷达(ISAR)多目标成像中,当各目标相互靠近且目标相对雷达的径向速度又相差较大时,存在使用已有的多目标成像方法无法对其成像的问题,文中提出了一种结合Radon变换、包络相关和DCFT的多目标成像方法。该方法采用Radon变换估计目标个数并对目标包络进行粗对齐;用传统的包络相关法结合目标隔离和曲线拟合法对目标进行精确的包络对齐;通过DCFT算法完成相位补偿,最后获得多个目标清晰的ISAR像。仿真实验结果验证了该方法的有效性。In multi-target inverse synthetic aperture radar（ISAR） imaging, when the targets are very close and the relative radial velocity is large, we can not resolve it using existing multi-target imaging methods. In order to solve this problem, the use of the Radon transform and a modified envelope correlation method for multi-target ISAR imaging is presented. The radon transform is used to align the range profiles coarsely. For more accuracy alignment, a modified envelope correlation method combining with target separation technique and curve fitting technique is proposed. After range alignment, phase compensation is fulfilled by discrete chirp-Fourier transform （DCFT）. The simulation results show that the method proposed in this paper is effective.

关 键 词：ISAR成像 多目标 RADON变换 DCFT变换 包络相关 

分 类 号：TN957.52[电子电信—信号与信息处理]