电子学报 ›› 2001, Vol. 29 ›› Issue (4): 433-435.

• 论文 •    下一篇

基于Hough变换的任意时频分布线条特征提取

张子瑜, 吴镇扬, 李 想, 任永川   

  1. 东南大学无线电工程系,南京 210096
  • 收稿日期:1999-11-18 修回日期:2000-04-28 出版日期:2001-04-25 发布日期:2001-04-25

Hough Transform Based Time-Frequency Representation Curve Character Extraction

ZHANG Zi-yu, WU Zhen-yang, LI Xiang, REN Yong-chuan   

  1. Department of Radio Engineering,Southeast University,Nanjing 210096,China
  • Received:1999-11-18 Revised:2000-04-28 Online:2001-04-25 Published:2001-04-25

摘要: 时频分布将时(空)域信号变换到时频联合域,揭示出信号的非平稳性、瞬时频率以及频率随时(空)间的变化演进,这其中往往主要含有线条成分,现有的分析方法只能探测直线成分(即线性调频参数),并且只是分析Wigner分布.本文进行两方面的推广,一方面将Hough变换探测各种参数曲线,可以对任意时频模式的信号进行检测;另一方面推广到任意时频分布,试验结果表明本文方法对于低信噪比的信号,检测可靠性更高,尤其对于自适应时频分布,效果更为满意.

关键词: 时频分布, Hough变换, 分数傅里叶变换, Rodon-Wigner变换, FRFT

Abstract: The time-frequency analysis can transform the time domain signal into time-frequency domain,and reveal the law of frequency varying with time.In the time-frequency representation,there are many curves,Present methods can only detect line and only be applied on Wigner time-frequency distribution.In this paper we extend in two directions:firstly we extend to apply on arbitrary time-frequency distribution,secondly we extend to detect any kind of curves in time-frequency distribution.Numeric experimentation show that this method can detect curves more robustly for low SNR signals especially applied on adaptive time-frequency distribution.

Key words: time-frequency distribution, Hough transform, Rodon-Wigner transform, FRFT

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