Computer Engineering and Applications ›› 2010, Vol. 46 ›› Issue (32): 116-118.DOI: 10.3778/j.issn.1002-8331.2010.32.032
• 数据库、信号与信息处理 • Previous Articles Next Articles
PING Dian-fa,ZHAO Pei-hong,DENG Bing
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平殿发,赵培洪,邓 兵
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Abstract: As a method of time-frequency analysis,spectrogram will be affected by cross-terms while analysing signals,especially for signals who are aneared,and also frequency resolutions will be influenced.This paper proposes combining fractional Fourier transform with spectrogram towards multi-component signals analysis.First,it obtains the optimal factional orders by using the second order fractional Fourier transform moments,and makes a fractional Fourier transform for multi-component signals according to the gained order,then gives spectrogram analysis based on the FrFT.Simulative examples indicate that the proposed method can effectively distinguish multi-component chirp signals,and the cross-terms can be suppressed availably.
摘要: 作为时频分析方法的一种,谱图对多分量信号分析时受交叉项影响,特别是当信号相隔很近时尤为严重,而且频率分辨率会受影响。给出了结合分数阶Fourier变换(FrFT)对多分量信号进行谱图分析的方法。首先利用分数阶二阶矩极值点而找到相应的最优旋转阶数,对所给多分量信号按此阶数做分数阶Fourier变换,再在此基础上做谱图分析。仿真实例表明,该方法对初始频率、调频率很接近的多分量的chirp信号能有效识别,交叉项可得到较好的抑制。
CLC Number:
TN911.72
PING Dian-fa,ZHAO Pei-hong,DENG Bing. Application of fractional Fourier transform in multi-component signals analysis based on spectrogram[J]. Computer Engineering and Applications, 2010, 46(32): 116-118.
平殿发,赵培洪,邓 兵. 分数阶Fourier变换在多分量信号谱图分析中的应用[J]. 计算机工程与应用, 2010, 46(32): 116-118.
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URL: http://cea.ceaj.org/EN/10.3778/j.issn.1002-8331.2010.32.032
http://cea.ceaj.org/EN/Y2010/V46/I32/116