西安电子科技大学学报

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一种强杂波背景下SAR目标超分辨成像方法

景国彬;盛佳恋;陈溅来;孙光才;邢孟道;保铮   

  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)
  • 收稿日期:2015-06-12 出版日期:2016-10-20 发布日期:2016-12-02
  • 通讯作者: 景国彬
  • 作者简介:景国彬(1990-),男,西安电子科技大学博士研究生,E-mail: Guobinjing01@163.com.
  • 基金资助:

    国家自然科学基金资助项目(61222108,61301292)

Super-resolution imaging method for the SAR target in a strong clutter scene

JING Guobin;SHENG Jialian;CHEN Jianlai;SUN Guangcai;XING Mengdao;BAO Zheng   

  1. (National Key Lab. of Radar Signal Processing, Xidian Univ., Xi'an  710071, China)
  • Received:2015-06-12 Online:2016-10-20 Published:2016-12-02
  • Contact: JING Guobin

摘要:

针对合成孔径雷达图像中存在较强杂波,难以提取目标信息和进行分辨率增强处理的问题,提出了一种强杂波背景下的超分辨成像方法.首先,从信号相关性的角度出发,估计杂波自适应门限来提取目标强散射点;然后,结合梯度下降搜索法提取出目标弱散射点;最后,利用提取后的目标散射点在图像域的稀疏性,通过简化的正则化处理方法,对目标进行分辨率增强处理,实现了目标超分辨成像.角反射器和静止的机动车目标实测数据处理的结果验证了文中方法的有效性.

关键词: 强杂波, 合成孔径雷达, 目标提取, 分辨率增强, 超分辨成像

Abstract:

This paper proposes a super-resolution imaging method to solve the problem of extracting targets and enhancing resolution under a strong clutter in the SAR image. Based on singal correlation, an adaptive clutter threshold is proposed to extract strong scatterers of targets. Then weak scatterers of targets are extracted by the gradient descent method. Finally, target resolution is enhanced to realize super-resolution imaging by the simplified regularization method. Real-measured data of reflectors and the stationary vehicle validate the effectiveness of the proposed method.

Key words: strong clutter, SAR, targets extraction, resolution enhancement, super-resolution imaging