Real Wavelet Transform-Based Phase Information Extraction Method: Theory and Demonstrations

Real Wavelet Transform-Based Phase Information Extraction Method: Theory and Demonstrations
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基于实小波变换的相位信息提取方法:理论与演示

DOI:
10.1109/tie.2008.2004389
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发表时间:
2009-03
期刊:
IEEE Trans. Ind. Electron.
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基于复小波变换(CORT)的相位信息(PI)提取方法是目前比较流行的方法。它们都不是同时简单、快速和不多余的。实数离散小波变换(RDWT)具有简单、快速、无冗余等优点,但通常认为它缺乏PI。在发现RDWT保留被分析信号的PI后,本文提出了三种基于RDWT的PI提取方法,并从数学的角度证明了基于RDWT的PI提取方法与基于CONT的PI提取方法是等价的。因此,基于RDWT的方法不仅可以提取PI,而且继承了RDWT的所有优点。在此基础上,提出了一种提取单频或渐近信号实际相位的求积方法。算例表明,基于CORT和RDWT的方法提取的PI曲线基本相同,而基于RDWT的求积方法提取的相位曲线与实际情况基本一致。讨论了该方法的工程应用,并给出了该方法的PI提取程序。
Complex wavelet transform (CoWT)-based phase information (PI) extraction methods are popular. None of them is simultaneously simple, fast, and nonredundant. Real discrete wavelet transform (RDWT) is simple, fast, and nonredundant, but it is usually regarded to be lacking PI. After finding out that RDWT conserves the PI of an analyzed signal, this paper proposed three RDWT-based PI extraction methods and proved that RDWT-based PI extraction methods are equal to CoWT-based ones from the mathematical point of view. Therefore, RDWT-based methods not only can extract PI but also can inherit all merits of RDWT. This paper further presented a quadrature procedure to extract the actual phase of single-frequency or asymptotic signals. Test examples demonstrated that the extracted PI by using the CoWT- and RDWT-based methods is almost the same, and the extracted phase curves by using the RDWT-based quadrature method are really the actual ones. Some engineering applications of the proposed method are discussed, and the PI extraction programs of the method are given.
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