Detection of Track Circuit Signal Based on Digital Phase Frequency Descrimination.

The cab signal plays an important position to guarantee the railway train operation safety and to improve the railway transport efficiency. Now, with the development of railway and the acceleration of train speed, the cab signal has been required as main rather than auxiliary cab signal as before. In view of this, the accurate and stable cab signal is a must in the process of running. Therefore, the analysis of waveform instantaneous frequency recorded on the recorder by means of the data processing system is an important means to solve the above problem and also a necessary and important task. In this case, this paper put forth to apply digital phase discrimination technology to the detection of frequency shift signal upper/lower side frequency and signal modulation lower frequency[3]. Compared with other methods, this method is characteristic of simple calculation and accurate and fast detection. [ABSTRACT FROM AUTHOR]