非参数波形提取方法及应用  

Method of Nonparametric Waveform Extraction and Its Application

作　　者：孙敬远[1] 孟庆丰[1] 

机构地区：[1]西安交通大学机械工程学院,西安710049

出　　处：《西安交通大学学报》2004年第3期266-269,共4页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(50075067);国家"八六三"计划资助项目(2001AA4133330).

摘　　要：介绍了一种基于滤波器组的非参数波形提取方法,并将其应用于冲击信号的提取.该方法不需要构造参数表达的基函数,而是将具有信号先验知识的模板信号通过滤波器组得到一组基函数来提取隐藏在噪声中的信号.其原则是使基函数在各个子频带内匹配原始信号.给出了4种获取模板信号的方法.模板信号的选择使该方法在实际应用中具有良好的柔性和适应性.仿真信号和实验信号验证了非参数波形提取方法的有效性和实用性,即使是在噪声和信号频带重叠的情况下,也能将信号分离和提取出来.A nonparametric method for extracting waveforms of signal embedded in additive noise is presented, where the construction of the general basis functions described by some parameters is unnecessary. Using a template signal that contains a prior signal information, a set of nonparametric basis functions are obtained by means of a filter bank. The primary principle of the proposed method is to match the observed signal with the template signal in each frequency band. The choice of the template signal facilitates the method for a wide variety of applications. Simulated and experimental results show that the method is practical and effective, even if the noise frequency band coincides with that of the signal.

关 键 词：非参数 波形提取 模板信号 滤波器组 

分 类 号：TP391[自动化与计算机技术—计算机应用技术] TB115[自动化与计算机技术—计算机科学与技术]