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一种直升机的舰船Dechirp实测数据SAR成像方法 被引量:14

An Effective Method for Ship Dechirp Data Imaging in Helicopter SAR System
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摘要 直升机由于飞行不稳将会给运动目标成像带来很大的误差,尤其是对复杂运动舰船的成像。该文提出了一种基于利用运动补偿并两次利用广义二阶keystone变换同时结合利用孤立的散射点进行WVD变换估计多普勒参数的方法来分别消除距离弯曲和距离走动并最终对舰船成像。文中对算法做了详细的推导证明,并最终得到了良好的成像结果。最后用3个运动点目标的仿真数据和dechirp实测舰船数据来证明该方法有效。 In view of unsteadily flying, the helicopter brings about great errors to moving targets imaging, especially SAR imaging of moving ship. So this paper shows an effective method based on an idea that uses motion compensation, general second-step keystone transform twice and at the same time, finds an isolated point and adopts WVD transform to estimate Doppler parameters for removing range walk and curvature. And what is more, the detailed deductions are given in this paper.Finally, the SAR image of moving ship is acquired in the azimuth frequency field. The simulation results of three moving point-targets and the imaging result of real ship data confirme this method.
出处 《电子与信息学报》 EI CSCD 北大核心 2007年第8期1794-1798,共5页 Journal of Electronics & Information Technology
基金 国家自然科学基金(60502044) 微波成像重点实验室基金(51442020404DZ0102)资助课题
关键词 DECHIRP 广义keystone变换 WVD 孤立的散射点 Dechirp General keystone transform WVD Isolated point
作者简介 李亚超:男,1981年生,博士生,从事雷达信号处理.SAR成像方面及动目标检测和成像的研究工作. 周峰:男,1980年生,博士生,从事雷达信号处理、SAR抗干扰研究、SAR成像方面及动目标检测和成像的研究工作. 邢孟道:男,1975年生,教授,博士生导师,主要研究方向为雷达成像和目标识别,主持自然科学基金重点项目、国防预研、跨行业预研基金、横向合作等十多项,已发表论文40多篇. 保铮:男,1927年生,教授,博士生导师,中国科学院院士, 主要研究领域为雷达信号处理、SAR成像处理、空时二维信号处理、动目标检测及成像和目标识别等.
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参考文献13

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