Using Wavelet Analysis Technology for Feature Extraction of Frequency Shift Signal
Linhai Zhao, Zhao Sheng-kai, Jiancheng Mu · Journal of the China Railway Society · 2006
According to the features of frequency shift signals, a feature extraction method based on the wavelet ridge line technique is proposed.This method provides a quick and accurate way to calculate the instantaneous frequency and envelope of frequency shift signal.Based on the calculated instantaneous frequency,the modulating low frequency can be imputted accordingly,thus providing a new scheme for analyzing and decoding the railway dedicated frequency shift signal and UM71 signal.