电子学报

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基于级数反演的斜视FMCW SAR成像算法研究

张双喜1, 李军2, 张磊1, 邢孟道1, 保铮1   

  1. 1. 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;
    2. 北京无线电测量研究所, 北京 100854
  • 收稿日期:2011-11-25 修回日期:2012-11-12 出版日期:2013-03-25
    • 作者简介:
    • 张双喜 男,1984年出生于福建东山.2004年就读于西安电子科技大学,2008年获学士学位,现为西安电子科技大学雷达信号处理国家重点实验室在读博士研究生,主要从事SAR、高分辨宽测绘SAR成像及其干扰抑制的研究. E-mail:shuangxizhang1984@163.com; 李 军 男,1982年出生于湖北宜都市.2002年就读于西安电子科技大学电子工程学院,2006年获学士学位,2011年获西安电子科技大学博士学位,现为北京无线电测量研究所工程师,主要研究方向:雷达成像. E-mail:lijun@mail.xidian.edu.cn
    • 基金资助:
    • 国家自然科学基金优秀青年基金 (No.61222108)

Frequency Modulated Continuous Wave Squint Synthetic Aperture Radar Imaging Algorithm Based on Series Reversion

ZHANG Shuang-xi1, LI Jun2, ZHANG Lei1, XING Meng-dao1, BAO Zheng1   

  1. 1. National Laboratory of Radar Signal Processing, Xidian University, Xi'an, Shaanxi 710071, China;
    2. The Measurement of Wireless Institute in Beijing, Beijing 100854, China
  • Received:2011-11-25 Revised:2012-11-12 Online:2013-03-25 Published:2013-03-25
    • Supported by:
    • National Natural Science Foundation of China for Excellent Youth Schoolars (No.61222108)

摘要: 在斜视调频连续波(FMCW)合成孔径雷达(SAR)成像中,斜距的三次项不仅会对相位产生影响,同时对包络也会有影响.如果不进行有效校正,将会影响到SAR图像的聚焦效果.针对这个问题,本文利用级数反演的方法推导出斜距展开到三次项时回波信号的距离多普勒频谱表达式,并在距离多普勒域上对三次项进行包络和相位滤波处理.此外,考虑到时域走动校正带来方位空变性问题,本文利用方位非线性变标算法(NCS)解决其沿方位空变性问题并给出结合运动补偿的实测数据处理的算法流程图.最后通过对多个点目标的场景进行仿真实验以及实测数据处理来验证本文成像算法的可行性和有效性.

关键词: 合成孔径雷达, 调频连续波, 解线性调频, 非线性变标, 级数反演

Abstract: In the frequency modulated continuous wave(FMCW)squint synthetic aperture radar(SAR)imaging,not only the phases but also the envelopes of the echoes will be affected by the third term in range.If it isn’t well-corrected,the performance of focusing for the SAR image will be deteriorated.Thus,the echo expression in the range-Doppler domain is presented by the series Reversion algorithm when the range expression comes to the third item.After that,a correction is implemented in the range-Doppler domain.In addition,considering the azimuth-variance in phase brought by the linear rang migration correction in azimuth time domain,the non-linear chirp scaling algorithm is utilized to solve the azimuth-variance problem.And a flowchart of the proposed FMCW imaging algorithm with motion compensation for processing the real measured data is given in this paper.Finally,the simulated experiment with multiple point targets scenario and the imaging result of real measured data are utilized to validate the feasibility and effectiveness of the proposed imaging algorithm.

Key words: synthetic aperture radar(SAR), frequency modulated continuous wave(FMCW), dechirp, non-linear chirp scaling(NCS), series Reversion

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