基于和差波束的三维ISAR成像技术  

3-D ISAR imaging technology based on sum-diff beam

作　　者：李军[1] 全英汇[1] 邢孟道[1] 黎海林[2] 李亚超[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,陕西西安710071 [2]北京跟踪与通信技术研究所,北京100094

出　　处：《电波科学学报》2010年第2期281-286,共6页Chinese Journal of Radio Science

基　　金：陕西省自然科学基础研究基金(No:2009JQ8022)

摘　　要：针对大带宽、高分辨的雷达信号,同一距离单元多个散射点复数叠加,导致传统基于一维距离像比幅测角的三维成像方法效果较差。提出了一种基于逆合成孔径雷达(ISAR)成像的三维成像方法,根据同一距离单元内多个散射点多普勒的不同,利用ISAR成像方法对多个散射点进行分离,在图像配准的前提下对和差信号ISAR像素点进行比幅法测角,最后,剔除角闪烁点及误差较大的散射点,对图像进行重构及合成得到三维ISAR像,同时完成目标定标。实测点目标及飞机目标的处理结果表明了本文方法较传统方法成像质量有较大改善,验证了方法的有效性及可行性。For wide-band and high-resolution radar signals,more than one scatters exist in one range-bin profile.The sum of many complex scatters causes the bad performance of traditional 3-D imaging method using the amplitude-comparisons of 1-D range profile.A new 3-D imaging algorithm based on inverse synthetic aperture radar（ISAR） imaging is proposed in this paper.First,different scatters are separated in one range-bin due to the different Doppler frequency.Second,amplitude-comparisons of pixel are obtained for ISAR images of sum or difference channel,following the step of registration.At last,3-D ISAR images are synthesized after eliminating the bad scatters,and at the same time,the real size of targets can be obtained.The results of real-data processing indicate that the algorithm proposed here performs better than traditional method,which validate the feasibility and superiority of the approach.

关 键 词：一维距离像 逆合成孔径雷达 三维成像 图像配准 

分 类 号：TN957.51[电子电信—信号与信息处理]