ZOOM-FFT在检测轨道电路移频信号参数研究中的误区

摘要

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.%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.