一种直升机的舰船Dechirp实测数据SAR成像方法

李亚超; 周峰; 邢孟道; 保铮

doi:10.3724/SP.J.1146.2005.01535

一种直升机的舰船Dechirp实测数据SAR成像方法

doi: 10.3724/SP.J.1146.2005.01535

基金项目:

国家自然科学基金(60502044)和微波成像重点实验室基金(5144202 0404DZ0102)资助课题

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出版历程
- 收稿日期: 2005-11-28
- 修回日期: 2006-05-22
- 刊出日期: 2007-08-19

An Effective Method for Ship Dechirp Data Imaging in Helicopter SAR System

摘要

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。
- Dechirp;广义keystone变换;WVD;孤立的散射点
Abstract: 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.

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参考文献(1)

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