雷达科学与技术2016，Vol.14Issue(4)：437-442,6.DOI:10.3969/j.issn.1672-2337.2016.04.017
一种适用于双基 SAR 的改进 PGA 方法
An Improved Phase Gradient Autofocus Method for Bistatic SAR
摘要
Abstract
In real bistatic synthetic aperture radar(BiSAR)system,the motion errors of the platform are inevitable,which will corrupt the final imaging result.Thus effective and accurate motion error estima-tion and compensation are the preconditions of precise BiSAR imaging.Focusing on the problem of motion errors of BiSAR,an improved phase gradient autofocus(PGA)algorithm for motion compensation is pro-posed.Different from the traditional PGA algorithm,the improved one takes both the range-dependent phase errors and the profile shifts into consideration,and results in higher precision of motion error estimation. Meanwhile,the local maximum likelihood estimation idea is expanded into the proposed improved PGA algo-rithm,which improves the efficiency of the algorithm effectively.Experiments on the real bistatic SAR data validate the effectiveness of the proposed algorithm.关键词
双基合成孔径雷达/相位梯度自聚焦/运动补偿/极大似然估计Key words
bistatic synthetic aperture radar(BiSAR)/phase gradient autofocus(PGA)/motion com-pensation/maximum likelihood estimation分类
信息技术与安全科学引用本文复制引用
陈士超,刘明,卢福刚,王军,张磊..一种适用于双基 SAR 的改进 PGA 方法[J].雷达科学与技术,2016,14(4):437-442,6.基金项目
国家自然科学基金(No.41471280) （No.41471280）
中央高校基本科研业务费专项资金(No.GK201603089) （No.GK201603089）
