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兵工学报 ›› 2005, Vol. 26 ›› Issue (6): 761-765.

• 论文 • 上一篇    下一篇

基于分数阶傅里叶变换的混响抑制方法研究

邓兵1,2,陶然1,齐林1,刘锋,2   

  1. 1.北京理工大学电子工程系,北京100081;2.海军航空工程学院电子工程系,山东烟台264001
  • 收稿日期:2004-04-04 上线日期:2014-12-25
  • 通讯作者: 邓兵
  • 基金资助:
    国家自然科学墓金资助项目(69972003)

A Study on Anti-reverberation Method Based on Fractional Fourier Transform

DENG Bing1,2, TAO Ran1, QI Lin1, LIU Feng1,2   

  1. 1. Department of Electronic Engineering, Beijing Institute of Technology, Beijing 100081, China; 2. Department of Electronic Engineering, Naval Aeronautical Engineering Institute, Yantai, Shandong 264001, China
  • Received:2004-04-04 Online:2014-12-25
  • Contact: DENG Bing

摘要: 线性调频( LFM)信号是声呐中一种常用信号。利用LFM信号在分数阶傅里叶变换( FRFT)域的良好聚焦性,提出了一种基于FRFT的混响抑制算法,在此算法中,通过分数阶Fourier域的窄带滤波来去除混响。对实测混响数据和LFM信号的分离效果进行了仿真,分离前后信混比得到了较大提高。

关键词: 信息处理技术 , 分数阶傅里叶变换 , Wigner-Ville分布 , 混响

Abstract: Linear frequeny modulation (LFM) signals are often used in sonars. Based on the fact that LFM sig?nal has a good focusing property in the fractional Fourier transform (FRFT) domain, a novel anti-reverberation algorithm was presented. It is based on fractional Fourier transform, in which LFM signal is separated from the reverberation through a narrow-band filter in fractional Fourier domain. Thus the effect of the reverberation is readily subtracted from the received signal. With the actual reverberation data and the LFM pulse for separa?tion, satisfactory results were obtained.

Key words: information processing technique , FRFT , WVD , reverberation

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