Signals And Telegrams Detector For CTCS Balise-Software And Hardware Design Of Main Control Board

In recent years, with the rapid development of high-speed railway, the safety of therailway system increasingly attracts attention of the public. The Balise and LEU, asimportant components of Chinese Train Control System existed, are used for datatransmission between train and wayside infrastructure of Train Control Center. We mustensure the accuracy of the balise internal information and the reliability of the datatransmission, which is of great significance to the train safety.At present, methods of detection to the Balise and LEU are restricted toconventional manual inspection and using of test vehicle，both of which own someshortcomings. Detection efficiency and fault detection rate are far behind therequirements at this stage. In this situation, CTCS balise telegram and signal detectioninstrument is developed. It can accomplish failure detection of the Balise and LEU,which is innovative. A feasibility hand-held instrument scheme is proposed in this thesis,which is based on the background of this subject. It takes into consideration actualdemand of the using of Balise and LEU. According to the order of demand analysis toarchitecture constructing then to specific implementation, this thesis completes bothhardware and software design of main control board of the balise telegram and signaldetection system. Main contents of the thesis are as follows:(1)After the introduction to the development, achievements and experience ofmodern railway, the importance of train operation safety will be illustrated, whichleading to an in-depth discussion of the research significance of this topic, the currentstatus both at home and abroad, and its development prospect and trends in this field.(2)We take into consideration of failure analysis and then get the key point ofsystem after in-depth study on the operation principle and signal characteristics ofBalise and LEU,which leading to the the functional requirements and design ideas ofthe instruments.(3)According to specific requirements of the system, component selection andhardware device design of the main controller board for this instrument is carefullyapproached, which will actually facilitate the achievement of related software functionality, such as telegram decoding, signal detection, real-time clock, buttonsresponse, display processing and online communication, etc.(4)Finally, some other research results of this group will be integrated into acomplete system for monolithic debugging, the test results will be used for erroranalysis and modification both in hardware and software. Ultimately, the test resultsshow that this instrument can realize telegram receiving and decoding of LEU and theactive balise, meanwhile it can realize the quantitative measurement on the signalamplitude and frequency of the LEU. Besides, it offers corresponding hints of theopen-circuit cable of transponder C, which indicate achieving the desired results.