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Realization Of Real-time Data Transmission And Reliability Of The Tcn

Posted on:2006-06-04Degree:MasterType:Thesis
Country:ChinaCandidate:C ChenFull Text:PDF
GTID:2208360182968976Subject:Communication and Information System
Abstract/Summary:PDF Full Text Request
Train Communication Network (TCN) is a network that connects various intelligent parts in train. It covers multifunction vehicle bus and wire train bus. Rapidity and reliability are needed in data communication of TCN for security of train. Existing local network technology can't ensure the real-time and reliability of data communication, TCN is a master-slave network which adopts real-time protocol, it has two different data communication modes according to the important degree of data, which are periodic data communication and non-periodic data communication. Data error can be strictly controlled when the real time of data communication, so the high-powered requirement of control and information communication of modern train can be satisfied well.The architecture and communication technology of two types of data of TCN are studied firstly, the method of data polling based on individual period is adopted to achieve the real time of process data on TCN by analyzing the message time of train bus detailedly. The method of using frame head checking, length checking, coding rule checking and check code checking to examine the correctness of data frame in TCN aiming at the special format of frame and the expression mode of signal is proposed. "Semi-bit error detection method" according to the characteristic of TCN is used to make train data frame maintain very high error detection rate using 8 bit as check sum. At last, the real time communication of network data and data error control based on extending Manchester code and an improved CRC algorithm in TCN are implemented based on constructing a small TCN successfully. Firm basis is made for normal running of TCN and safety of the train.
Keywords/Search Tags:TCN, RTP, reliability, data error control
PDF Full Text Request
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