基于Radon时频分析的海面舰船目标SAR-ISAR混合成像方法  

SAR-ISAR hybrid imaging method for sea surface ship target based on Radon time-frequency analysis

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作  者:陈洪猛[1] 李军[1] 刘京[1] 黄伟 张英杰 陈燕 鲁耀兵[1] CHEN Hongmeng;LI Jun;LIU Jing;HUANG Wei;ZHANG Yingjie;CHEN Yan;LU Yaobing(Beijing Institute of Radio Measurement,Beijing 100854,China)

机构地区:[1]北京无线电测量研究所,北京100854

出  处:《系统工程与电子技术》2025年第1期109-116,共8页Systems Engineering and Electronics

摘  要:高海情下,由于海面舰船目标在偏航、俯仰和横滚3个维度的非规则运动引入的高阶相位,导致机载雷达对海面舰船目标直接进行合成孔径雷达(synthetic aperture radar,SAR)成像时会出现散焦现象。针对此问题,提出一种基于Radon时频分析的机载海面舰船目标SAR-逆SAR(inverse SAR,ISAR)混合成像方法。首先,建立了机载海面舰船目标SAR-ISAR混合成像模型,将海面舰船目标的三轴转动引起的舰船成像模糊问题转化为高阶相位误差的估计问题。然后,基于Radon时频分析的方法精确估计运动舰船目标的高阶相位信息,并构造相应的高阶相位因子进行补偿。最后,基于估计的高阶相位信息对舰船目标进行SAR-ISAR精聚焦成像,实测数据的处理结果验证了所提方法的有效性。Under high sea conditions,the irregular motion of ship targets in the three dimensions of yaw,pitch,and roll introduces high-order phase,which leads to defocusing phenomenon when airborne radar directly performs synthetic aperture radar(SAR)imaging of ship targets on the sea surface.Aiming at this problem,a hybrid imaging method of airborne sea surface ship target SAR-inverse SAR(ISAR)based on Radon time-frequency analysis is proposed.Firstly,a hybrid imaging model of SAR-ISAR for airborne sea surface ship targets is established,which transforms the problem of ship imaging blurring caused by the three-axis rotation of sea surface ship targets into an estimation problem of high-order phase errors.Then,based on Radon time-frequency analysis,the high-order phase information of moving ship targets is accurately estimated,and corresponding high-order phase factors are constructed for compensation.Finally,based on the estimated high-order phase information,the ship target is subjected to SAR-ISAR fine focusing imaging,and the processing results of the measured data verified the effectiveness of the proposed method.

关 键 词:机载雷达 海面舰船目标 合成孔径雷达-逆合成孔径雷达混合成像 

分 类 号:TN953[电子电信—信号与信息处理]

 

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