| 基于EMD的信号瞬时特征的小波分析方法 |
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| 引用本文： | 程军圣,于德介,杨宇.基于EMD的信号瞬时特征的小波分析方法[J].地震工程与工程振动,2004,24(2):181-186. |
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| 作者姓名： | 程军圣 于德介 杨宇 |
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| 作者单位： | 湖南大学,机械与汽车工程学院,湖南,长沙,410082;湖南大学,机械与汽车工程学院,湖南,长沙,410082;湖南大学,机械与汽车工程学院,湖南,长沙,410082 |
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| 基金项目： | 国家自然科学基金项目(50275050)，高等学校博士点专项科研基金项目(20020532024) |
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| 摘 要： | 提出了一种基于EMD(Empirical Mode Decomposition)的信号瞬时特征的小波分析方法。用这种方法提取非平稳信号的瞬时频率和瞬时幅值分三个基本步骤：首先，用EMD把信号分解成IMF(Intrinsic Mode Function)分量；接着，对IMF分量进行小波分析，从小波系数的幅角函数中提取小波脊线；最后，从小波脊线中提取瞬时频率和瞬时幅值。通过对仿真信号的分析，验证了该方法能有效地分析非平稳信号。
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| 关 键 词： | EMD 小波脊线 非平稳信号 瞬时频率 瞬时幅值 |
| 文章编号： | 1000-1301(2004)02-0181-06 |
Signal instantaneous attribute analysis using wavelet transform based on EMD |
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| CHENG Jun-sheng,YU De-jie,YANG Yu.Signal instantaneous attribute analysis using wavelet transform based on EMD[J].Earthquake Engineering and Engineering Vibration,2004,24(2):181-186. |
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| Authors: | CHENG Jun-sheng YU De-jie YANG Yu |
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| Abstract: | In this paper, a method for signal instantaneous attribute analysis using wavelet transform based on EMD (Empirical Mode Decomposition) is proposed. It includes three procedures while extracting instantaneous frequencies and amplitudes of non-stationary signal. First, a non-stationary signal is decomposed into some IMFs (Intrinsic Mode Functions) by using EMD method; second, applying wavelet transform to the IMFs, the wavelet ridge line is extracted from the phase function of the wavelet coefficients; finally, the instantaneous frequencies and amplitudes are obtained from the wavelet ridge line. By analyzing the simulated signal, it is confirmed that the proposed method can be applied to non-stationary signal processing efficiently. |
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| Keywords: | empirical mode decomposition wavelet ridge line non-stationary signal instantaneous frequency instantaneousamplitude |
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