Based On The Labview Railway Signal Processing Research

This subject introduced the basic principles of the track circuit signal and thedevelopment platform for virtual instruments based on LABVIEW For the currentsituation of the test methods, it proposed a low-frequency demodulation method basedCZT algorithms on ZPW-2000system to meet the demand of high-precisiondemodulation of the parameters of the track frequency signal. The method was realizedby software on the development platform and finally achieved the target after simulatingand debugging. It laid the foundation for further improvement and optimization of thetest method.First of all, the subject provided an overview of the track circuit system and thecurrent situation of the test methods of the track signal. Then the subject analyzed themathematical model.Secondly, the subject described the virtual instrument technology, the developmentplatform, and the characteristics of the software and hardware, focusing on the dataacquisition produced by NI and the signal processing module used in the method.Then the subject put forward a proposal of low-frequency demodulation for thetrack signal based on CZT algorithm and the technology of spectrum correction. Theresult was verified by simulation on MATLAB, showing that this algorithm improvedthe accuracy of the measurement of the signal while reducing the complexity ofcomputation. And the noise immunity was improved at the same time.Finally, the demodulation was realized in LABVIEW and the test results met therequirement, proving that it has the value in practice...