高分辨率机载SAR多子带合成误差补偿方法  

A Compensation Method for High Resolution Airborne SAR Multiple Subbands Synthesis Error

作　　者：田东 禹卫东[1] 李宁[3] 邹航 TIAN Dong;YU Weidong;LI Ning;ZOU Hang(Institute of Electronics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Computer and Information Engineering,Henan University,Kaifeng 475004,China)

机构地区：[1]中国科学院电子学研究所,北京100190 [2]中国科学院大学,北京100049 [3]河南大学计算机与信息工程学院,河南开封475004

出　　处：《雷达科学与技术》2018年第6期589-595,共7页Radar Science and Technology

基　　金：国家973计划项目资助课题

摘　　要：合成孔径雷达(SAR)能够实现高分辨率成像,在遥感领域发挥着不可替代的作用,在军事和民用方面都有着广泛的应用。高分辨率SAR需要宽带收发系统,为了缓解大带宽对信号接收和采集设备的压力,对发射的宽带信号采用子带分割方法,在信号处理中通过对子带回波进行合成获得高分辨率图像。针对在子带合成时子带内和子带间误差会严重影响最终的图像质量,提出了一种基于实测数据的子带合成误差补偿方法。利用定标数据补偿子带内误差,利用回波数据补偿子带间误差,最终实现了多子带误差补偿,并利用机载SAR实测数据验证了方法的正确性和有效性。Synthetic aperture radar(SAR)can achieve high resolution imaging and play an irreplaceable role in remote sensing field.It is widely used in military and civilian areas.High resolution SAR requires a wideband transceiver system.In order to alleviate the pressure of large bandwidth for signal receiving and collecting device,a sub-band splitting method is adopted for the transmitted wideband signal,and a high resolution image is obtained by synthesizing the sub-band echoes in the signal processing.For sub-band synthesis,the error within sub-band and the between sub-bands will seriously affect the final image quality.A sub-band synthesis error compensation method based on the measured data is proposed.The error within sub-band is compensated using the inner calibration data,and the error between sub-bands is compensated using the echo data.The error compensation of sub-band synthesis is achieved finally.The correctness and effectiveness of the proposed method is verified by the measured data of airborne SAR system.

关 键 词：合成孔径雷达 高分辨率 子带合成 误差补偿 

分 类 号：TN958[电子电信—信号与信息处理]