Design And Implementation Of Train Integrated Positioning System Based On2oo2Structure

The integrated train positioning system based on multi-sensors realized the complementary of advantages of all the sensors, which improves the precision of train positioning system greatly. However, the integrated train positioning system still can't satisfy the train control system at the requirements of high reliability and high safety, so the redundant technology should be introduced into integrated train positioning system to improve the reliability of train positioning system.This paper had researched the state of redundant technology at home and abroad, and the structures of redundant system were analyzed. In consideration of the capability of fault detection, several typical redundant structures were compared, and then a2oo2(two out of two) structure was selected as the basic structure of integrated train positioning system.On the basis of the functional requirements of integrated train positioning system based on2oo2structure, in the paper, the structure of the system was designed and according to the state of train positioning information, the operation model partition of the system was given, and the conversion conditions between the work models were demonstrated in detail. The hardware platform and software platform of the system were designed and implemented, and the synchronization mechanism as well as the communication mechanism between all the modules were also designed. With the aiming to improve the fault detection ability of system, the decision mechanism for information was designed from several aspects such as the information judgment structure, information decision priority.According to the fault-detection mechanism which has been designed and implemented for2oo2integrated positioning system in the paper, the failure rate of positioning information was analyzed and compared between the single integrated train positioning system and the2oo2one under every operational state of the system, and the result has been highlight the advantage of2oo2integrated train positioning system in reducing the failure rate of positioning information. Besides, the fault-detection result generated during system running in practical was also analyzed, and the fault-detection ability of positioning system for GPS and ODO was evaluated in this paper, and the fault-detection ability of2oo2train integrated positioning system has been verified through above work. Finally, the design philosophy of integrated train positioning system based on2oo2structure was summarized, while some feasibility proposals for subsequent research of this paper were also put forward, and then the development of the redundant technology in both the research and application fields of integrated train positioning system based on2oo2structure was prospected.