一种检测铁路2FSK信号频率的新方法

Method for Detection of the Frequencies of Railway 2FSK Signal

为实时高精度获取铁道二进制频移键控信号的上、下边频和基带低频信息,提出一种可兼容国产制式和法国UM71制式的频率检测新方法.该方法将自相关解调技术、FFT技术、能量重心频谱校正技术有机结合起来,算法简单且计算复杂度低,在FFT长度选为256时,频率测量结果即可符合技术要求,具有较高应用价值.

To acquire the information of railway binary frequency-shift keying （ 2FSK ） signal＇s upper and down side frequencies and base low-frequency with high accuracy in real time, a novel frequency detection algorithm compatible with China-made system and France UM71 system was proposed. This method combines the techniques of autocorrelation demodulation, FFT and energy centrobaric spectrum correcting method. And the proposed algorithm is simple and applicable in that the side frequency detecting result can suit the technique specification for 256-length FFT.