| 基于信号分解和群延时的维格纳分布改进方法 |
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| 引用本文： | 丁建明,林建辉,杨强,陈哲明.基于信号分解和群延时的维格纳分布改进方法[J].农业机械学报,2010,41(2):198-202. |
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| 作者姓名： | 丁建明 林建辉 杨强 陈哲明 |
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| 作者单位： | 西南交通大学牵引动力国家重点实验室,成都,610031 |
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| 基金项目： | 国家"973"重点基础研究发展计划资助项目 |
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| 摘 要： | 提出一种WVD (Wigner Ville distribution)的改进方法.应用离散余弦谐波小波变换对多分量信号进行分解,计算分解后得到的单分量信号的WVD,将单分量信号的WVD沿频率轴串联得到整个信号的WVD,抑制分布的交叉项.应用修改群延时函数减少因WVD核函数截断而产生的波动效应,改善分布的时频分辨率.通过算例中的线性调频信号和应用实例中轴承振动信号验证表明,改进后的WVD有满意的时频分辨率和明显的交叉项抑制能力,能够通过离散余弦变换实现其快速算法,算法快速、简单,适合非平稳工程信号的时频分析.
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| 关 键 词： | Ville分布 离散余弦谐波小波变换 交叉项抑制 修改群延时函数 吉布斯效应 |
Improved Wigner Ville Distribution Based on Signal Decomposition and Modified Magnitude Group Delay |
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| Ding Jianming,Lin Jianhui,Yang Qiang and Chen Zheming.Improved Wigner Ville Distribution Based on Signal Decomposition and Modified Magnitude Group Delay[J].Transactions of the Chinese Society of Agricultural Machinery,2010,41(2):198-202. |
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| Authors: | Ding Jianming Lin Jianhui Yang Qiang and Chen Zheming |
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| Institution: | State Key Laboratory of Traction Power/a>;Southwest Jiaotong University/a>;Chengdu 610031/a>;China |
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| Abstract: | A new method was proposed for improving the performance of the Wigner Ville distribution.The WVDs of the subbands gotten by DCHWT(discrete cosine harmonic wavelet transform),was concatenated to obtain an overall WVD,significantly free from the existence of cross-terms was applied to reduce the Gibbs effect from the truncation of the Wigner Ville distribution kernel.Examples of application demonstrated that this proposed method obeys the desirable properties of timefrequency resolution and strikingly reduces... |
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| Keywords: | Wigner Wigner Ville distribution DCHWT Cross-term suppression MMGD Gibbs effect |
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