ZOOM-FFT在检测轨道电路移频信号参数研究中的误区

Misunderstanding of research on detecting parameters of frequency-shift signaling in track circuit using ZOOM-FFT

本文在分析移频信号的频谱特点的基础上,通过MATLAB仿真发现,用ZOOM-FFT方法提高频率分辨率是有前提条件的,该方法需要较长的采样时间,而这不能满足测试仪表实时性要求。并指出了ZOOM-FFT在检测轨道电路移频信号参数研究中的误区。

This paper analyzed the characteristic of frequency-shift signaling.Through the simulation of MATLAB,it was found that it was of prerequisite to improve the frequency resolution by ZOOM-FFT,it needed more sampling time,and could not meet the real-time needs of testing instrumentation.The paper pointed out the misunderstanding of research on detecting the parameters of frequency-shift signaling in track circuit using ZOOM-FFT.