摘要
傅氏变换在频域能对信号整体作频谱分析,很难直接分析交流计数信号。近年来兴起的子波变换可对信号进行多尺度分析,容易提取信号特征。本文是用子波变换方法分析铁路交流计数信号。并且通过采用不同的小波基对铁路交流计数信号进行仿真,通过分析比较找到合适的小波基,结合频谱分析的方法得到铁路交流计数信号的有关参数。最后给出仿真的例子。
Fourier analysis is a mathematical technique for transforming our view of thesignal from a time-based one to a frequency- based one. But it is impossible to tell when aparticular event took place. Wavelets can afford the ability to perform local analysis——thatis, to analyze a localized area of a larger signal. Based on the time-frequency localization character of wavelet transform, this paper presents the analysis method of railroad AC counting signal. With the help of FFT, a success example is given in the end of this paper.
出处
《铁路计算机应用》
1999年第6期3-5,共3页
Railway Computer Application
