For the demand of the railway system and the deficiency of the spectrum analysis, IFM is applied to the demodulation of rail-signals to acquire two key parameters-the upper and lower side frequencies.

• 本文针对频谱分析法的不足以及铁路现场的需要,将实时测频技术用于铁路信号分析中以获得FSK信号的上下边频。