一种新的基于瞬时干涉的SAR-GMTI精聚焦和定位方法  

Multi-channel Synthetic Aperture Radar-Ground Moving Target Indication High-accuracy Focusing and Positioning Using Instantaneous Interferometry

作　　者：张升[1] 孙光才[1] 李学仕[1] 邢孟道[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,西安710071

出　　处：《电子与信息学报》2015年第7期1729-1735,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金优秀青年基金(61222108);国家自然科学青年基金(61301292);中央高校基本科研业务费专项(K5051302058)资助课题

摘　　要：在合成孔径雷达地面运动目标检测(SAR-GMTI)中,由于场景中多个运动目标运动参数不同且在合成孔径时间内运动参数随时间变化,因此常规算法较难有效解决动目标信号的距离徙动(RCM)和方位散焦问题,难以实现动目标的精聚焦,从而影响动目标定位精度。该文提出一种基于瞬时干涉的动目标精聚焦和定位方法。首先提取单个动目标信号,精提取瞬时干涉相位(IIP)并结合径向速度解模糊得到动目标瞬时径向速度,经过距离徙动补偿并最终实现动目标的精聚焦,提高动目标定位精度。实测数据处理结果验证了该方法的有效性。In Synthetic Aperture Radar-Ground Moving Target Indication （SAR-GMTI） processing, it is difficult to solve the Range Cell Migration （RCM） and azimuth defocusing problems simultaneously since the motion parameters of each moving target is different, which makes the high-accuracy focusing of moving target unattainable, thus affects the accuracy of positioning. A high-accuracy focusing and positioning of moving-targets method based on instantaneous interferometry is proposed in this paper. Firstly, single moving target can be extracted. After that, by iteratively extracting the high-accuracy Instantaneous Interferometric Phase （IIP） of moving target and solving the across-track velocity ambiguity, accurate across-track velocity can be obtained and utilized in RCM removing. After all, high-accuracy focusing of moving target can be achieved, which improves the accuracy of positioning. The processing results of measured data illustrate the effectiveness of the proposed method in this paper.

关 键 词：合成孔径雷达 地面运动目标检测 瞬时干涉 径向速度模糊 

分 类 号：TN957.52[电子电信—信号与信息处理]