Research On The Creat Of Limit Movement Authority Based On Moving Block

Zone control (ZC) is a very important subsystem in Communication Based Train Control system who is a train control system based on wireless communication. It has the function that on-board and way-side exchange their large capacity information continuously and two-way. And it is a very important equipment in moving block system.The core module of ZC is Movement Authority Unit (MAU). The paper has done a lot of research on the functions of MAU and the dates and parameters of it. The function of MAU is calculating the Limit Movement Authority (LMA) under different scenes. First, MAU gets the information from Automatic Train Supervision (ATS), wayside electronic unit, on-board and static database of lines.Making use of the information it can calculate the wayside LMA. The paper has discussed the circuit structure and search algorithm based the structure, designed topological structure based on directed graph, constructed the foundation of operation scenes. The scenes of urban rail transit are complex and it is divided into two parts, communication successful scene and communication unsuccessful scene. According to the communication among subsystems is success or not, the paper analysis the communication states between MAU and VOBC, MAU and ATS, MAU and MAU. At last it makes solutions about failure scenes in the most adverse circumstances.Finally, it finishes the simulation in order to test and verify the function of MAU. The simulation contains lines structure module, the simulation of train running module communication failure setting and communication failure recovery module. It simulates several trains'mutual tracking relationship on different time tracking interval and change the state of MAU by setting the communication to failure. It does well in operation and is convenient to watch.