应用小波变换尺度谱检测行波暂态信号

Detection of Travelling Wave Transient Signal Using Wavelet Transformation Scalogram

介绍小波变换定义、性质和时间尺度分析，研究小波变换的尺度谱检测无噪声和有噪声条件下的行波暂态信号的能力．通过检测尺度谱图的峰值实现对行波暂态信号的检测．对三种小波变换的尺度谱和参数选择进行仿真和比较后表明，选择好合适的小波和参数，即使在较低的信噪比条件下也有相当好的检测效果．与只用小波变换检测相比，尺度谱图法检测表现更好，适应性更强．

A new approach using scalogram of w avelet transform for travelling w ave transient signal detection, under noise free condition or noise condition separately, was described. The detection is based on the detection ofthe peaks ofscalogram . The scalogram s ofthree kinds ofw avelettransform s and the selection ofparam etersw ere sim ulated. The resultshow sthatthisapproach hasgood detection effecteven underlow SNRcondition ifappropriate w aveletand param etersare selected. Com pared w ith the detecting by using wavelettransform only, this schem e has betteradapting ability and detecting ability.