基于时间-调频率分布的多目标ISAR成像  

ISAR Imaging of Multiple Targets Using Time-Chirp Distribution

作　　者：苏鑫[1] 张月辉[1] 朱玉鹏[1] 付耀文[1] 

机构地区：[1]国防科技大学电子科学与工程学院空间电子信息技术研究所,湖南长沙410073

出　　处：《雷达科学与技术》2009年第6期425-431,共7页Radar Science and Technology

基　　金：国家自然科学基金(No.60872134)

摘　　要：由于不同目标相对雷达的平动不同,单目标运动补偿方法不能同时完成各个目标的平动补偿,因而无法获得清晰的多目标ISAR像。文中提出了一种对同一雷达波束内距离不能分辨的多个运动目标进行ISAR成像的方法,根据不同目标的平动多普勒近似线性变化且变化历程不同的特点,采用CLEAN技术,基于回波信号的时间-调频率分布得到各个目标对应的调频率,分离不同目标的信号分量,从而将对多目标成像转变成了对多个单目标成像,利用单目标运动补偿和成像方法获得各个目标的ISAR像。仿真结果验证了该方法的有效性。The translational motions of multiple targets are different from each other. Therefore, by applying conventional motion compensation algorithms for single target, multiple targets cannot be resolved. In this paper, an inverse synthetic aperture radar（ISAR） imaging method is proposed for multiple targets loca ted in the same beam of antenna and the same range bin with respect to radar. Since the Doppler histories of targets are different and can be treated as approximately linearly changing, the chirp rate, which is obtained from the time-chirp distribution of the echo by use of CLEAN, is used to separate the echo of each target. Therefore, the multiple target imaging is changed into a number of single target imaging. Motion compensa tion and image reconstruction techniques for a single target can be used to obtain the image of each target. The simulation experiments are presented to illustrate the effectiveness of the proposed method.

关 键 词：平动补偿 时间-调频率分布 ISAR成像 多目标成像 

分 类 号：TN958[电子电信—信号与信息处理]