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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。
Based on the analysis of spectral characteristics of the frequency-shifted signal, we found by MATLAB simulation that it is a precondition to improve the frequency resolution by the ZOOM-FFT method. This method requires a long sampling time, which can not meet the real-time Claim. And points out the errors of ZOOM-FFT in detecting the parameters of frequency shift signal of track circuit.