Analysis Of Error Control And Interrupt On GSM-R In The Environment Of Disconnecrtion Electromagnetic Noise Of Pantograph And Catenary

Relationship of pantograph and catenary attracts more and more attentions in electric railway system. Disconnection of pantograph and catenary is a hot topic in the electrical industry. The spectrum of disconnection electromagnetic arc noise ranges from tens Hz to 1G Hz, which may cause interference to the GSM-R system, increase the bit error rate of GSM-R, and even cause interruption communications if serious. Therefore, the interference caused by the disconnection electromagnetic noise of pantograph and catenary to the GSM-R system becomes a problem demanding an prompt solution. Aiming at the above problems. the main content of the thesis is as follows:The thesis simulates the disconnection noise by using Markov chain, and applies the frequency and duration methods to the reliability analysis of disconnection noise. The thesis discusses the characteristics of the disconnection electromagnetic noise of pantograph and catenary, and simulates the generation frequencies and spectral distribution of the disconnection electromagnetic noise of pantograph and catenary in certain time according to the generation mechanism of the disconnection of pantograph and catenary. In addition, the thesis analyzes the influence caused by the GSM-R network interrupt on MA and late arrival in operations in detail, and simulates the transmission of MA in the figure of the station when the GSM-R network interrupts. And it also researches the measures of reducing interrupt frequency of GSM-R network.The disconnection electromagnetic noise may interfere with GSM-R, so that in this thesis, the methods of GSM-R anti-interference are compared. For GSM-R system channel burst error caused by the noise, the thesis discusses changing the long burst error to random error through interleaving technology, and uses the Turbo with an internal interleaver to correct random error codes. It also analyzes Turbo code's structure and decoding method, and discusses error performance of Turbo codes. The thesis uses VC to simulate coding scheme designed in it, and the results show that the coding scheme designed plays a certain role in reducing the channel burst error caused by the noise.