弹载SAR子孔径大斜视成像方位空变校正新方法

doi:10.3969/j.issn.1001-2400.2015.04.015

J4 ›› 2015, Vol. 42 ›› Issue (4): 88-94+197.doi: 10.3969/j.issn.1001-2400.2015.04.015

弹载SAR子孔径大斜视成像方位空变校正新方法

李震宇;杨军;梁毅;邢孟道

(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:2014-03-23 出版日期:2015-08-20 发布日期:2015-10-12
通讯作者: 李震宇
作者简介:李震宇(1991-)，男，西安电子科技大学博士研究生，E-mail: zhenyuli_2012@sina.com．
基金资助:
国家自然科学基金资助项目(61101245)；中央高校基本科研业务费专项资金资助项目(K5051302046)

New method for azimuth-dependent correction of highly squint missile-borne SAR subaperture imaging

LI Zhenyu;YANG Jun;LIANG Yi;XING Mengdao

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

Received:2014-03-23 Online:2015-08-20 Published:2015-10-12
Contact: LI Zhenyu

摘要/Abstract

摘要：

斜视成像是弹载合成孔径雷达(Synthetic Aperture Radar，SAR)的一种重要工作模式，从实际应用出发，弹载SAR为实现快视成像常采用子孔径处理．由于在大斜视模式下，距离方位严重耦合，常规算法成像处理的第1步是采用时域校正距离走动的方法来消除距离方位的耦合，这会带来方位相位随方位位置空变问题，造成方位无法统一处理，影响方位聚焦深度．文中详细分析了弹载SAR大前斜瞬时斜距模型，针对子孔径数据，提出一种基于高次相位滤波的方位空变校正新方法，实现方位统一聚焦处理．点目标仿真数据处理验证了文中所提方法的有效性和实用性．

关键词: 斜视成像, 弹载合成孔径雷达, 子孔径, 聚焦深度, 高次相位滤波

Abstract:

Squinted imaging is one of the most important modes in the missile-borne synthetic aperture radar (SAR). Usually, from the view of practical applications, the missile-borne SAR adopts subaperture processing in order to implement quick look imaging. In the highly squint mode, the echo signal couples greatly between range and azimuth, so traditional algorithms perform the linear range walk correction in the azimuth time domain firstly to mitigate greatly the range-azimuth coupling, which causes the problem of position dependent azimuth phase, resulting in the azimuth uniform processing disabled and impacting the azimuth depth of focus (DOF). Based on the deep analysis of the instantaneous slant range model in the highly squint missile-borne SAR, this paper proposes high-order phase filtering to correct azimuth-dependence for implementing the identical azimuth-focusing processing. Simulation results validate the effectiveness of the proposed algorithm.

Key words: squinted imaging, missile-borne SAR, subaperture, DOF, high-order phase filtering

李震宇;杨军;梁毅;邢孟道 . 弹载SAR子孔径大斜视成像方位空变校正新方法[J]. J4, 2015, 42(4): 88-94+197.

LI Zhenyu;YANG Jun;LIANG Yi;XING Mengdao. New method for azimuth-dependent correction of highly squint missile-borne SAR subaperture imaging[J]. J4, 2015, 42(4): 88-94+197.

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弹载SAR子孔径大斜视成像方位空变校正新方法

New method for azimuth-dependent correction of highly squint missile-borne SAR subaperture imaging

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