The Research And Design Of Multi-source Information Fusion Based Train Speed And Position Detecting System

With the rapid development of urban rail transit, the researches on new type transporthave been getting great progress, especially on complete system. Dynamic speeddetermination and positioning sub-system is one of the key technologies of automatic trainoperation control system. In the CBTC system, the reliability of speed detection and theaccuracy of positioning, are the key points on the train safety operation efficiently. Thefurther study on train-car dynamic speed detection and positioning should be significant onnew type transport developing and promoting.In this thesis, a study on theoretical analysis of dynamic speed determination andpositioning detection is taken in-depth. Upon theoretical analysis, a comparison on varietytechnologies is expanded. Based on the special environment of urban rail transit operation, asuitable design of train speed and position detection subsystem is applied.Firstly, in this paper, the various methods of train speed and position measurement areelaborated, errors mechanism on speed determination and positioning detection system isstudied by existing.systems analysis. Slide&slip error causes and effects analysis is alsoinvolved. Combining speed, point-positioning and bar code identification system, a newsolution is provided: The integrated use of a variety speed detection to calculate thedisplacement of the train, and apply the communication between interrogator and transponderto check and correct train location information, then, Bar code information on the train stationto reduce the error further.Secondly, information fusion technologies improve safety and Robustness of thedesigned system. Multi-source information fusion method for various types of sensormeasurements achieves complementary advantages, verification effectiveness in the system.Upon the technologies, a designed system is provided:(a). Train speed position static testsignal source model;(b). Train speed and position detection software subsystem,(c).“3-vote-2redundant system” architecture and hardware system.Finally, System verification based on train speed position static test signal: Designed3-vote-2redundant system enhance the system accuracy and stability; Particularly the use of avariety of different data quality processing modules in a redundant system design redundancycalculation, it is enhanced level of security of the system; In terms of software, dataprocessing, multi-source information fusion method can effectively eliminate the error sensordata acquisition; Excellence test result, to achieve the desired design goals.