西安电子科技大学学报 ›› 2016, Vol. 43 ›› Issue (3): 125-130.doi: 10.3969/j.issn.1001-2400.2016.03.022

• 研究论文 • 上一篇    下一篇

一种采用相位扰动处理的大斜视SAR成像方法

曲广洲1,2;梁毅3   

  1. (1. 武汉大学测绘学院,湖北 武汉  430079;
    2. 北京机电工程研究所, 北京  100074;
    3. 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:2014-12-14 出版日期:2016-06-20 发布日期:2016-07-16
  • 通讯作者: 曲广洲
  • 作者简介:曲广洲(1979-),男,高级工程师,武汉大学博士研究生, E-mail: qgzh@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)

Imaging algorithm for highly squinted SAR data processing based on phase disturbing

QU Guangzhou1,2;LIANG Yi3   

  1. (1. School of Geodesy and Geomatics, Wuhan Univ., Wuhan  430079, China;
    2. Beijing Electro-mechanical Engineering Institute, Beijing  100074, China;
    3. National Key Lab. of Radar Signal Processing, Xidian Univ., Xi'an  710071, China)
  • Received:2014-12-14 Online:2016-06-20 Published:2016-07-16
  • Contact: QU Guangzhou

摘要:

针对快视成像处理的需要,提出了一种采用相位扰动处理的子孔径数据大斜视合成孔径雷达成像方法.首先给出了目标瞬时斜距模型,分析了距离向处理和方位向处理.其中距离向处理采用时域校正距离走动、频域校正距离弯曲的方式实现距离与方位的二维解耦;时域走动校正处理会带来方位调频率空变问题,影响一致聚焦,然后采用频域引入扰动相位来消除子孔径数据的调频率方位空变性,并结合谱分析技术实现方位聚焦.点目标仿真数据和机载实测数据处理验证了该方法的有效性和实用性.

关键词: 合成孔径雷达, 子孔径, 大斜视, 相位扰动

Abstract:

For quick look imaging, a phase disturbing algorithm (PDA) for focusing synthetic aperture radar (SAR)subaperture data acquired at a high squint angle is proposed. First, the signal model is addressed and then the range processing and azimuth processing are analyzed in detail. The PDA performs the linear range walk correction (LRWC) in the time domain and the range cell curvature correction (RCCC) in the frequency domain to mitigate the range-azimuth coupling. Additionally, a disturbing phase is introduced in the frequency domain to remove the variation of the Doppler chirp rate with the azimuth position caused by LRWC in the time domain,and so an identical reference function can be employed in azimuth processing. Simulated results and raw data processing validate the effectiveness of the proposed algorithm.

Key words: SAR, subaperture,highly, squinted, phase disturbing