J4 ›› 2011, Vol. 38 ›› Issue (5): 108-114.doi: 10.3969/j.issn.1001-2400.2011.05.018

• 研究论文 • 上一篇    下一篇

利用小波变换进行合成孔径雷达窄带干扰抑制算法

张双喜;张磊;郭睿;周鹏;邢孟道   

  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:2010-10-29 出版日期:2011-10-20 发布日期:2012-01-14
  • 通讯作者: 张双喜
  • 作者简介:张双喜(1984-),男,西安电子科技大学博士研究生,E-mail: shuangxizhang1984@163.com
  • 基金资助:

    国家部委预研重点基金资助项目(9140A21020609DZ01);博士学科点专项科研基金资助项目(200807010002)

SAR interference suppression algorithm for narrow band interference via wavelets

ZHANG Shuangxi;ZHANG Lei;GUO Rui;ZHOU Peng;XING Mengdao   

  1. (National Key Lab. of Radar Signal Processing, Xidian Univ., Xi'an  710071, China)
  • Received:2010-10-29 Online:2011-10-20 Published:2012-01-14
  • Contact: ZHANG Shuangxi

摘要:

在对窄带干扰(NBI)进行时频特性分析的基础上,提出了一种利用小波变换进行NBI抑制的方法.该方法首先把回波数据的频谱变换到多分辨的小波域中|然后在小波域中采用恒虚警概率方法对小波系数进行干扰识别和干扰抑制|接着把干扰抑制后的数据变换到原始回波数据域,利用常规的SAR成像算法进行成像处理|最后得到清晰的SAR图像.与其他窄带干扰抑制算法相比,该算法在干扰抑制过程中对有用信号造成的损失较小,并且可以有效地抑制时变的NBI.结合仿真和实测数据的处理,经过实验分析,验证了该方法的有效性.

关键词: 合成孔径雷达, 窄带干扰, 干扰抑制, 小波变换

Abstract:

The presentation of Narrow-band interference (NBI) usually degrades the imaging quality dramatically. Based on the time-frequency feature analysis of NBI, a new NBI suppression algorithm is proposed by Wavelets transform in this paper. In this algorithm, spectrum of echo corrupted by NBI is transformed into multi-resolution wavelet domain. Then the NBI components can be identified and subsequently filtered out while preserving useful signal as much as possible by constant-false-alarm-rate. In the following, the data after NBI suppression is transformed into the original echo domain. Finally, well-focused SAR imagery can be obtained from the echoes without NBI by traditional SAR imaging algorithm. The loss of the effective data during the operation is smaller than other NBI suppression algorithm. In addition, this algorithm is robust to time-varying NBI. Imaging results of both simulation data and measured data have proved the validity of this algorithm.

Key words: synthetic aperture radar (SAR), narrow-band interference (NBI), interference suppression, wavelet transform