The Research Of Track Circuit Signal Analyzing System Based On Virtual Instrument

Track circuit is one of the key equipment to ensure the safety of train operation, we can know the situation of track circuit through the analyzing of the carrier frequency,low frequency and amplitude of track circuit signal.It is the traditional method of detecting the track circuit signal to use the track signal tape-record, and analyze the spectrum. Since traditional method is inconvenient on analyzing and storage, as well as complex to design and difficult to change, it is significant to design a convenient method of detecting the track signal. A FSK(frequency shift keying) signal real-time analyzing method based on virtual instrument is offered in the paper through the analyzing of the FSK signal of the FS-2500 track circuit.At first, it is introduced of the concept and development of virtual instrument,the hardware and software platform and the characters of the FSK signal. Then it is discussed of signal processing method including the FIR (finite impulse response) filtering and FFT (Fast Fourier Transform). Finally, it is tested of the performance of the system, including the test of the data acquisition module and the test of the accuracy of the systems, and analyzes the test result.