一种高精度移频信号解析方法

Analysis Method of High Precision Frequency Shift Signal

介绍一种高精度移频信号的解析方法,实现基于铁路信号集中监测系统对铁路移频信号进行信号解析和指标监测。对铁路移频信号的载频、低频和边频进行解调和计算,采用时域方法对数据进行下采样提高计算精度,频域方法 Zoom-FFT计算载频和低频,零相移滤波方法消除滤波后的信号延迟现象,将滤波后的数据进行整形,从而定位用于计算边频的数据序列,并对该数据序列进行FFT频域计算,得到边频值。这种方法可以提高计算精度。

This paper introduces an analysis method of high-precision frequency-shift signals,to achieve the signal analysis and index monitoring of railway frequency-shift signals based on the railway centralized traffic control system.The proposed method involves the demodulation and calculation of the carrier frequency,low frequency and side frequency of railway frequency-shift signals.The time domain method is used to down-sample the data,so as to improve the calculation accuracy.The frequency domain method Zoom-FFT is used to calculate the carrier frequency and low frequency.The zero-phase-shiftfiltering method is used to eliminate the phenomenon of signal delay afterfiltering.Thefiltered data is shaped to locate the data sequence used to calculate the side frequency.The FFT frequency domain calculation is performed on the located data sequence to obtain the side frequency value.The proposed method can improve the calculation accuracy,so to meet the needs of engineering application.