机载双站聚束SAR改进ωK算法  

A Modified wK Algorithm for Air-borne Spotlight Bistatic SAR

作　　者：黄丽佳[1,2] 仇晓兰[1,2] 胡东辉[1,2] 时信华[3] 丁赤飚[1,2] 

机构地区：[1]中国科学院空间信息处理与应用系统技术重点实验室,北京100190 [2]中国科学院电子学研究所,北京100190 [3]北京跟踪与通信技术研究所,北京100094

出　　处：《电子与信息学报》2013年第9期2154-2160,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(60972149;61101200)资助课题

摘　　要：双站SAR能够获取目标不同方向的雷达散射系数,有助于图像分类和识别。双站聚束SAR分辨率高,目标识别能力更强。针对机载双站聚束SAR长合成孔径时间特点,该文引入改进双曲等效方法,修正了双曲等效距离模型的三次项精度;推导了2维波数域信号表达式,给出波数域图像重建方法;建立了距离-方位波数域的距离空变补偿项,提高了ωK算法的距离空变处理能力。计算机仿真结果验证了机载双站聚束SAR改进ωK算法的精确性和有效性。The Bistatic SAR （BiSAR） acquires the radar cross section of target area from different directions, which is helpful for SAR image classification and target recognition. The spotlight mode has higher resolution and thus has advantages in target recognition. This paper introduces an advanced hyperbolic approximation method to fit accurately the cubic term of range history. Besides, the wavenumber domain signal is derived and the image formation process is given. Then, the residual phase term induced by range variance property is shown, and the compensation step is accommodated in the modified wK algorithm, which enhance the imaging performance at the edges of scene. The simulation results verify the accuracy and validity of the proposed method.

关 键 词：双站SAR 聚束模式 改进双曲等效 ωK算法 

分 类 号：TN958[电子电信—信号与信息处理]