西安电子科技大学学报

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一种空间域支撑区融合的改进Omega-K算法

怀园园1,2;梁毅1,2;高悦欣1,2;邢孟道1,2   

  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. 西安电子科技大学 信息感知技术协同创新中心,陕西 西安 710071)
  • 收稿日期:2016-06-23 出版日期:2017-10-20 发布日期:2017-11-29
  • 通讯作者: 梁毅(1981-), 男, 副教授, E-mail: yliang@xidian.edu.cn
  • 作者简介:怀园园(1986-), 男, 西安电子科技大学博士研究生, E-mail: yhuai_edu@163.com.
  • 基金资助:

    海洋公益性行业科研专项经费资助项目(201405001)

Distance domain data support region fusion approach for modified Omega-K algorithm

HUAI Yuanyuan1,2;LIANG Yi1,2;GAO Yuexin1,2;XING Mengdao1,2   

  1. (1. National Key Lab. of Radar Signal Processing, Xidian Univ., Xi'an 710071, China;
    2. Collaborative Innovation Center of Information Sensing and Understanding, Xidian Univ., Xi'an 710071, China)
  • Received:2016-06-23 Online:2017-10-20 Published:2017-11-29

摘要:

针对传统Omega-K算法难以通过子孔径图像的相干叠加实现高分辨成像,提出一种基于改进Omega-K子孔径成像算法的空间域融合方法.利用改进的子孔径数据方位波数域聚焦方法,实现方位向处理独立于解耦合操作,同时避免了子孔径成像在较短空间域支撑区所引起的大量补零操作.再对各子孔径数据进行相干性处理及方位向空间域支撑区融合,通过各子孔径数据相干叠加实现全孔径数据的高分辨成像.

关键词: 合成孔径雷达, 改进Omega-K算法, 相干叠加, 子孔径

Abstract:

It is hard for the conventional Omega-K algorithm to implement the coherent addition of the sub-aperture image to realize the full-aperture resolution. A distance domain data support region (DSR) fusion approach based on the modified Omega-K algorithm is proposed in this paper. By the implementation of the modified sub-aperture wavenumber domain algorithm, the range-azimuth coupling is solved. At the same time, the burden of the zeros padding processing introduced by the short distance DSR of the sub-aperture data is greatly mitigated. Then the coherence processing and distance domain data support region fusion are performed. By adding the sub-aperture data coherently, the full-aperture resolution in azimuth is realized.

Key words: synthetic aperture radar(SAR), modified Omega-K algorithm, coherent addition, sub-aperture