快速后向投影合成孔径雷达成像的自聚焦方法

doi:10.3969/j.issn.1001-2400.2014.01.013

J4 ›› 2014, Vol. 41 ›› Issue (1): 69-74.doi: 10.3969/j.issn.1001-2400.2014.01.013

快速后向投影合成孔径雷达成像的自聚焦方法

张磊;李浩林;邢孟道;保铮

(西安电子科技大学雷达信号处理国家重点实验室，陕西西安 710071)

收稿日期:2012-09-21 出版日期:2014-02-20 发布日期:2014-04-02
通讯作者: 张磊
作者简介:张磊(1984-)，男，博士，E-mail: zhanglei_0330@126.com．
基金资助:
国家自然科学基金资助项目(61301280)；中央高校基本科研业务费资助项目(72135855)

Autofocusing the synthetic aperture radar imagery by the fast back-projection algorithm

ZHANG Lei;LI Haolin;XING Mengdao;BAO Zheng

(National Key Lab. of Radar Signal Processing, Xidian Univ., Xi'an 710071， China)

Received:2012-09-21 Online:2014-02-20 Published:2014-04-02
Contact: ZHANG Lei

摘要/Abstract

摘要：

针对机载合成孔径雷达(SAR)的定位和惯导精度不足的问题，提出了一种结合时域快速后向投影(FBP)成像算法的多孔径图像偏移(MAMD)自聚焦算法．该MAMD算法与FBP处理流程完全相容，有效保持了FBP成像处理的高精度和高效率性能．通过该算法有效处理系统定位精度不足导致的FBP成像聚焦下降问题．利用实测机载SAR数据验证了所提算法的有效性．

关键词: 合成孔径雷达, 快速后向投影, 自聚焦, 运动补偿

Abstract:

Time-domain Fast Back-Projection (FBP) is an accurate and efficient solver to generate high-resolution Synthetic Aperture Radar(SAR) images. However, motion errors seriously degrade the performance of the FBP image when the accuracy of the position system does not reach the wavelength level. In this paper, we propose a novel multi-aperture map drift (MAMD) algorithm, which is implemented within the FBP iterations. The autofocus processing is realized by estimating the shift of sub-aperture images and it keeps the high accuracy of the FBP algorithm. Experiments by using real airborne SAR data validate the effectiveness of the proposed algorithm.

Key words: synthetic aperture radar(SAR), back-projection, fast back-projection, autofocus, motion compensation

张磊;李浩林;邢孟道;保铮. 快速后向投影合成孔径雷达成像的自聚焦方法[J]. J4, 2014, 41(1): 69-74.

ZHANG Lei;LI Haolin;XING Mengdao;BAO Zheng. Autofocusing the synthetic aperture radar imagery by the fast back-projection algorithm[J]. J4, 2014, 41(1): 69-74.

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快速后向投影合成孔径雷达成像的自聚焦方法

Autofocusing the synthetic aperture radar imagery by the fast back-projection algorithm

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