毕业论文外文翻译---日本铁路信号系统的技术特点考索(编辑修改稿)

毕业论文外文翻译---日本铁路信号系统的技术特点考索(编辑修改稿)内容摘要：

DSATC. In the ATC system the speed signal is in the drivers cab, which received permitted speed information from the ground equipment continuously. ATC s central logic system transmits ATC signals to track circuit. ATC signals are about speed information, while they are used as train detection signals. The logic device can determine the section on which a train is present by monitoring the level of received ATC signal power because the wheels of the train short the track circuits. To set the rack circuit boundary and speed pattern is to sustain train s headway, which is necessary for train traffic control. In the ATC system the central logic system undertakes the most train interval control. The onboard system controls the braking system according to the instructions from the central logic system. Distance between trains is an important concept in railway transportation control. In this control method the system recognizes the distance between two consecutive trains firstly. Then the system controls their speed to insure a safe distance. In order to realize this distance control, various new functions are required, such as positioning exactly, high speed munication between trains and ground devices. The major difference between DATC and traditional ATC lies on that DATC is an intelligent onboard system. Every train calculates its appropriate permitted speed according to the stop position information from the ATC central logic system. Administer and Communication Technology Feature There is one point to stop one train before it crashes the preceding train. That is just to control critical stop distance. And the key information is the exact train position and where the train should stop. We know the ATC service purpose so that the basic functions of new ATC are clear. In another word equipment on the ground only transmits the train stop information, and then the train itself confirms its position and calculates the distance between it and the stop position. After that the train takes the radian and gradient into account and brakes at the proper moment. Ideal distance control model consists of trains which know each others positions. The model realized because of wireless munication technology development. In railway an area is divided into several control areas, in which ground devices and radio base stations are set up. Ground devices in every control area have many functions, such as train positioning, distance control, switching control, level crossing control and security for maintenance. Radio base stations and onboard equipment exchange information. As the appropriate interval between stations is determined according to the service area covered by radio transmissions, every base station is connected with corresponding ground control devices. The onboard puter controls brakes according to the control information from the ground devices, while it sends out the train position information to the ground equipment through onboard mobile radio base。