| 基于小波变换的基波提取和频率测量 |
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| 引用本文： | 王肖芬,徐科军. 基于小波变换的基波提取和频率测量[J]. 仪器仪表学报, 2005, 26(2): 146-151 |
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| 作者姓名： | 王肖芬 徐科军 |
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| 作者单位： | 合肥工业大学自动化研究所,合肥,230009 |
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| 基金项目： | 高等学校骨干教师资助计划项目 |
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| 摘 要： | 为了提高小波变换提取信号基波和测量频率的精度 ,采用分频特性较好的小波对信号进行滤波 ,并研究最佳分解级数的问题。在频率测量中 ,针对低频噪声的影响 ,提出极大值误点的判别方法 ,采用最小二乘法估计基频 ;针对非整周期采样误差的影响 ,采用抛物线插值的方法加以解决
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| 关 键 词： | 小波变换 信号分解 基波提取 频率测量 |
| 修稿时间： | 2003-05-01 |
Fundamental Wave Extraction and Frequency Measurement Based on Wavelet Transform |
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| Wang Xiaofen,Xu Ke jun. Fundamental Wave Extraction and Frequency Measurement Based on Wavelet Transform[J]. Chinese Journal of Scientific Instrument, 2005, 26(2): 146-151 |
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| Authors: | Wang Xiaofen Xu Ke jun |
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| Abstract: | In order to improve the accuracy of fundamental wave extraction and frequency me asurement in signal processing a wavelet function with good frequency characteri stic is adopted for signal filtering and the optimal decomposition level of wave let transform is studied. In frequency measurements a judgment method for wrong maximum value points is proposed and the fundamental frequency of signal is esti mated by the least square method, which decreases the influence of low frequency noises. An interpolation method in parabola form is used to eliminate the error of non-integral cycle sampling. |
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| Keywords: | Wavelet transform Signal decomposition Fundamental wave extraction Frequency measurement |
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