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Chongqing light-rail Jiaoxin line wireless system
Source: undefined    Time: 07.08.27

轨道无线专用通信系统

Chongqing light-rail Jiaoxin line is the city’s important infrastructure project and the successful completion of the project brings tremendous contribution for Chongqing’s traffic and boosts the Chongqing economic and social development.
According to the situation that there are a lot of mountain road and high buildings in Chongqing and the rail is monorail, 712 Co., Ltd provided a new railway wireless communication system. 
    The system adopts professional communication (PMR) net frame in which the base station and dispatch are the main sets and the optical repeater is used to accomplish long-distance cover, see figure1-1.As Chongqing light-rail is the first monorail transit, under the fully landform and Cab installation analysis the project team decided to adopt optical repeater to accomplish the wireless cover.
To avoid the multi-path disturbance and increase the reliability of wireless communication, the project team established an error prevention and correction software protocol to ensure the system communication and the rail transmit security. .
The system also provides two-level malfunction infirmness and many kinds of redundancy methods to ensure the normal running of the rail transmit at the outside.
     The distance covers14.35 kilometers and there are 14 stations and 1 control center in the first phase of Chongqing light-rail Jiaoxin line .The wireless system includes train dispatching communication sub-system, maintain/disaster-preventing dispatching sub-system, station dispatching sub-system and vehicle segment sub-system, and the first one whose function includes single call, group call, broadcast call, emergency call, team call and line call is used for communication in normal traffic.
     
In order to ensure better communication, the system also adds a net administer for centralized management of each dispatching station, at the same time the net administer can implement the real-time monitor and management of the on-line train, station transmitter-receiver ,base station and repeater.
The system provides long-distance debug through which the system can adjust output power, receiver limit, signal gain and date transfer rate according to the situation. It decreased the difficulty of the system first-run and makes the system maintenance easily.
      The total cost of the Chongqing light-rail wireless system is less than one fourth of the PMR , however, the function of the Chongqing light-rail wireless system completely satisfied the light-rail requirement. Because of the self development 712 Co., Ltd own the intellectual property right, thus, 712 Co., Ltd could improve the system according to the user’s need at any moment.
       This system gets a good remark from the user at once after the system runs. Again, 712 Co., Ltd shows their advantage in professional field.

   

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