Security Research On The Train Positioning System

TheTrain Control system is a complex control system which used the technology of conventional railway signal, computer, communication and so on. Thetrain control system is also a key system that ensuring the safety of train’s movement with high efficiency. Safety assurance plays a key role in the development of whole life of urban rail system because the safety is related to the passenger, environment and society.The position determination of a train is the basis, core technology and key research topic of thetrain control system. The basic function of position determination system demands that confirming the train’s position exactly whenever and wherever; the safety and accuracy influence the safety and control ability of the system.This dissertation firstly analyzes the safety requirement of automatic train control system, and introduces the safety theory, then a model for safety analysis is presented; on this basis, the position determination system of thetrain control system is researched, the factors that may cause the failure is researched seriously; a FTA (Fault Tree Analysis) odel of position determination system is modeled to analysis the potential hazards; at last, combining the triangular fuzzy number and information entropy, adopting experts’judgments, using risk analysis method to assess the risk of system hazard. The algorithm is implemented by the Visual2010#programming environment, and the software RiskAssessment which can accomplish the risk calculation of different scenarios fulfills the functions that recording the experts’ judgmentsand calculating the minimum distance based on Hausdorff.