Research On The Main-unit Of The Interval-Equipment Of The Locomotive Signaling Wireless Transmission System

The limitation of the Track-Based Cab Signal System is bound to affect the efficiency of railway transport. There are more than 30,000 km of the existing semi-automatic block tracks whose equipments and technology are backward. The Radio-Communication-Based Train Control System(R-CBTC) is the development direction of the train control system, the Radio-Based Cab Signal is a kind of simple form of the R-CBTC, and the locomotive signaling wireless transmission technology is the key to the Radio-Based Cab Signal System. It follows that:The locomotive signaling wireless transmission system resolution has sufficient research background and broad applications.In this paper, a type of the continuous radio-based Cab Signaling System which is composed of digital radio group is presented. It sets a few digital transmission stations along the railway to achieve full coverage range of wireless field Strength. The overall structure, the working mechanism and applications of the continuous radio-based Cab Signal System are also discussed. And then, the technical requirements of the Locomotive Signaling Wireless Transmission System are presented. It mainly includes that the field strength coverage requirements, vehicle equipment requirements, system performance, reliability design principle, Etc. Based on this, the whole design scheme of the Locomotive Signaling Wireless Transmission System is pointed out, it mainly includes that the system structure and function, the network structure, the basic business processes, the system communication protocols, and so on.When the trains run in the railway section block, the Locomotive Signaling is passed to the interval equipments from the station equipments firstly, and then, the interval equipments pass the Locomotive Signaling to the vehicle equipments that are belonged to the range of the interval equipments and receive the receipt message from the vehicle equipments. This shows that the interval equipments are an important bridge between the station equipments and the vehicle equipments, and are also the key nodes of the whole wireless transmission network. Therefore, this paper selects the main control unit of the interval equipment as the main object to study on, the details of hardware designing of the main control unit are presented, the hardware design uses the high performance 32-bit embedded ARM platform and the Protel99SE tools. The article also gives the process and results for the functional testing of the main Control unit on the integration testing platform. Finally, the applications of Locomotive Signaling Wireless Transmission System are pointed out:it can carry the Locomotive Signaling transmission business to form different kinds of railway section block control system. It also can be used in conjunction with CTCS2 level ATP to form new CTCS2 level train control system.The Locomotive Signaling Wireless Transmission System which is presented in this paper is a kind of wireless mobile communication platform that is able to adapt the development requirements of the Radio-Based Cab Signal System. And it not only can be used to carry the Radio-Based Cab Signal System, but also can carry the CBTC system. In addition, the main control unit of the interval equipment is not only the key equipment to achieve two-way communication between the interval equipments and the vehicle equipments, but also it's one of the key technologies to achieve continuous, stable, and reliable transmission of the Locomotive Signaling through wireless means.