弹载SAR下降段成像算法研究

doi:10.3969/j.issn.1001-2400.2011.03.015

J4 ›› 2011, Vol. 38 ›› Issue (3): 90-98.doi: 10.3969/j.issn.1001-2400.2011.03.015

弹载SAR下降段成像算法研究

周松；周鹏；李亚超；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:2010-05-18 出版日期:2011-06-20 发布日期:2011-07-14
通讯作者: 周松
作者简介:周松(1984-)，男，西安电子科技大学博士研究生，E-mail: zhousong8411@sina.com．
基金资助:
国家自然科学基金重大项目资助项目(60890072);博士学科点专项科研基金资助项目(200807010002)

Research on the imaging algorithm for missile-borne SAR with downward movement

ZHOU Song；ZHOU Peng；LI Yachao；XING Mengdao；BAO Zheng

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

Received:2010-05-18 Online:2011-06-20 Published:2011-07-14
Contact: ZHOU Song

摘要/Abstract

摘要：

弹载SAR下降段成像中，弹体较大的下降速度和加速度将导致SAR回波信号的多普勒调频率沿方位向变化，影响方位聚焦．针对该问题，提出了一种利用方位非线性变标(NLCS)的弹载SAR下降段成像算法．该算法在距离徙动校正和距离压缩处理之后，通过引入方位非线性变标操作，补偿变化的多普勒调频率，并校正图像方位畸变，从而改善了方位聚焦深度和聚焦质量．数据仿真结果验证了算法的有效性．

关键词: 弹载SAR, 非线性变标, 聚焦深度

Abstract:

During the downward movement for Missile-Borne SAR imaging, variation of Doppler FM rates for echo signal severely affects the focusing effect, which is introduced by high vertical velocity and acceleration. For this reason, by using azimuth nonlinear chirp scaling (NLCS), an imaging algorithm for Missile-Borne SAR is proposed in this paper. After range cell migration correction and range compression, variation of Doppler FM rates for the echo signal can be compensated and image distortion can be corrected by the operation of azimuth nonlinear chirp scaling, thus improving the focus depth and focusing effect. Simulation results are provided to validate the effectiveness of the proposed algorithm.

Key words: missile-borne SAR, nonlinear chirp scaling (NLCS), focus depth

周松；周鹏；李亚超；邢孟道；保铮. 弹载SAR下降段成像算法研究[J]. J4, 2011, 38(3): 90-98.

ZHOU Song；ZHOU Peng；LI Yachao；XING Mengdao；BAO Zheng. Research on the imaging algorithm for missile-borne SAR with downward movement[J]. J4, 2011, 38(3): 90-98.

参考文献

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[2]	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.
[3]	周鹏;李亚超;邢孟道. 弹载扫描SAR宽测绘带模式成像方法研究[J]. J4, 2011, 38(1): 96-103.
[4]	俞根苗(1;2);邓海涛(2);吴顺君(1). 弹载SAR图像几何失真校正方法[J]. J4, 2006, 33(3): 386-389.
[5]	黄源宝;李真芳;保铮. 机载大斜视SAR的快速简易成像方法[J]. J4, 2004, 31(4): 543-546.

弹载SAR下降段成像算法研究

Research on the imaging algorithm for missile-borne SAR with downward movement

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