Method for Detection of the Frequencies of Railway 2FSK Signal
Changbin Li · Journal of Tianjin University Science and Technology · 2007
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.