一种新的斜视波束指向SAR信号处理方法

doi:10.3969/j.issn.1001-2400.2014.03.009

J4 ›› 2014, Vol. 41 ›› Issue (3): 56-62.doi: 10.3969/j.issn.1001-2400.2014.03.009

一种新的斜视波束指向SAR信号处理方法

吴玉峰;孙光才;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:2013-09-02 出版日期:2014-06-20 发布日期:2014-07-10
通讯作者: 吴玉峰
作者简介:吴玉峰(1985-)，男，西安电子科技大学博士研究生，E-mail: wyf1176@163.com．
基金资助:
国家自然科学基金优秀青年科学基金资助项目(61222108)；国家自然科学青年基金资助项目(61301292)；中央高校基本科研业务费专项资金资助项目(K5051302058)

Novel signal processing approach for squint beam-steering SAR (BS-SAR)

WU Yufeng;SUN Guangcai;XING Mengdao;BAO Zheng

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

Received:2013-09-02 Online:2014-06-20 Published:2014-07-10
Contact: WU Yufeng

摘要/Abstract

摘要：

针对斜视波束指向合成孔径雷达(BS-SAR)信号时，存在距离向与方位向的强耦合性及方位频谱的模糊问题，提出了一种基于方位重采样的信号频谱处理方法．线性距离走动校正后对信号频谱进行方位向重新采样，将其完全等效为正侧视合成孔径雷达信号的频谱．针对斜视BS-SAR，将方位重采样与谱分析技术相结合，得到无模糊及方位空变的二维频谱；再采用传统的正侧视BS-SAR算法，实现对场景的聚焦．仿真实验表明，文中方法可以有效应用于斜视BS-SAR的数据处理中．

关键词: 斜视波束指向合成孔径雷达, 方位重采样, 线性距离走动校正, 等效正侧视处理

Abstract:

Due to the severe coupling effect between range and azimuth and the aliasing in the azimuth-frequency domain, it is difficult to deal with the squint Beam-Steering Synthetic Aperture Radar (BS-SAR) signal. Although the linear range walk correction can decrease the coupling effect dramatically, it leads to azimuth-variation into the Doppler frequency modulation (FM) rate and range cell migration (RCM). In order to eliminate the azimuth-variation, a novel spectrum processing approach based on azimuth resampling is proposed in this paper. After the linear range walk correction, the azimuth resampling is carried out in the azimuth-frequency domain and the signal’s spectrum will be completely equivalent to the broadside SAR configuration. For squint BS-SAR, the resampling is combined with the SPECAN technique. So the squint BS-SAR signal’s spectrum without aliasing and azimuth-variation can be obtained. Then the signal can be focused by the broadside BS-SAR imaging algorithm. Simulation results show that the proposed approach can be used to process squint BS-SAR data effectively.

Key words: squint beam-steering SAR (BS-SAR), azimuth resampling, linear range walk correction, equivalent broadside processing

吴玉峰;孙光才;邢孟道;保铮. 一种新的斜视波束指向SAR信号处理方法[J]. J4, 2014, 41(3): 56-62.

WU Yufeng;SUN Guangcai;XING Mengdao;BAO Zheng. Novel signal processing approach for squint beam-steering SAR (BS-SAR)[J]. J4, 2014, 41(3): 56-62.

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一种新的斜视波束指向SAR信号处理方法

Novel signal processing approach for squint beam-steering SAR (BS-SAR)

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