一种基于机载三通道SAR的舰船成像方法  

An Imaging Method for Maritime Ship Based on Airborne Three-Channel SAR

作　　者：夏慧婷 李勇[1,2] 黄翔飞[1,2] 

机构地区：[1]南京航空航天大学电子信息工程学院,江苏南京211106 [2]雷达成像与微波光子技术教育部重点实验室(南京航空航天大学),江苏南京211106

出　　处：《雷达科学与技术》2017年第1期1-7,共7页Radar Science and Technology

基　　金：南京航空航天大学研究生创新基地(实验室)开放基金项目(No.KFJJ20150405);中央高校基本科研业务费专项资金资助项目;航空科学基金(No.20142052020)

摘　　要：运动舰船在合成孔径雷达(SAR)图像中会发生散焦。为解决运动舰船精细成像的难题,提出了一种基于机载三通道SAR系统对舰船实现海杂波抑制和聚焦成像的信号处理方法。鉴于舰船运动的未知性,利用三通道SAR结构对舰船目标定位,可以抑制成像背景的强海杂波影响,同时引入数字聚束技术与广义二阶Keystone变换,解决了运动目标SAR成像中跨距离单元走动和散焦的问题,可对图像中多个不同运动状态的舰船实现并行成像处理,获取聚焦良好的图像。仿真数据结果验证了所述方法的有效性与可行性。The moving maritime ships appear blurred in SAR images. In order to solve the problem of fine imaging of moving ships, a signal processing method based on airborne three-channel SAR system for sea clutter suppression and focused imaging is proposed. In view of the unknown nature of ship motion, the three-channel SAR structure is utilized to inhibit the effects of strong sea clutter in the background for the precise location of ships. The digital spotlight technology and generalized second-order Keystone transform are introduced to remove the across-range cell migration and defocusing in SAR images of the moving targets. This method can obtain well-focused SAR images of different moving targets by parallel processing. The results of simulation data demonstrate the effectiveness and feasibility of this method.

关 键 词：合成孔径雷达(SAR) 舰船成像 数字聚束 广义二阶Keystone变换 

分 类 号：TN959.72[电子电信—信号与信息处理]