| With the accelerated process of urbanization, urban rail transit is developed rapidly.Passenger Information System (PIS), providing information services for passengers, isapplied in the construction of urban rail transit more and more. It plays a role in promotingthe service quality and operational level of urban rail transit. Based on related research,development projects and practical system construction, this dissertation aims to study thekey technology of PIS. The methods of combination of theory and practice, mathematicalmodeling and logical analysis and systems integration and comprehensive are used to seekthe theoretical breakthrough of key technology so as to provide reference for future researchand construction of system.This dissertation aims at the PIS of urban rail transit, in particular, the systematic keytechnology. The main research contents are as follows:1）The conception of PIS Control Center (PCC) is introduced. The managementframework, function definition and general structure are proposed, including networkstructure, inter-system interface and software architecture. The PCC is an easy expandingdistributed platform framework based on SOA technology in the whole subway network,including network structure, inter-system interface and software architecture. Comparingwith PIS under the independent line operation mode, this service platform can integrate bothinternal and external multi-media, and provide a comprehensive and full coverage ofinformation service system for passengers.2）In order to resolve the problem of slow upload/download and poor effect of onlinequery, Peer-to-Peer (P2P) technology is introduced. Realizing large file transfer and solvingthe shortage of the seed resources during file transmission. Combination with the streamingmedia technology, the identity authentication scheme, data distribution and transmissionmechanism, security mechanism and topology model are designed for the PIS. Comparingwith FTP and P2P distributed processing, the PIS framework under P2P topology model isgiven, improving the quality of the video on demand, download and transmission, andoptimized the passenger’s user experience. It not only lays the foundation for the further system development and design, but also provides a reference for further upgrades ofoptimization of existing system.3）Based on analyzing the3-D rendering technology, a rendering method of text andimage is designed, which can effectively solve the defect of not smooth scrolling marquee.In order to improve the efficiency of information transmission effectively, the news releasesystem and scheduling mechanism based on RSS publishing model and the Quartz schedulerframework are present.4）Based on the analysis of the rail transit passenger information system train-groundwireless transmission system characteristics, the proposal of train-ground wirelesstransmission (TGWT) based IEEE802.11n for PIS is proposed. Based on analyzing thecharacteristics of TGWT, the requirement for the new generation of PIS is introduced. Withthe IEEE802.11n, the system network structure is optimized. In order to the continuity andreliability of data transmission, a rapid roaming switching mechanism is considered into theproposal. At the end, the stability and security of this TGWT proposal are analyzed,proposing PIS wireless network security design, building multi-layered security protectionmechanisms, and carrying out verification tests. The results show that the combination ofmultiple security technologies can enhance the application of urban rail transit PIS systemwireless data transmission security.5）Developing an integration platform of PIS. The requirement, overall design, systemstructure and function of PIS integration service platform are proposed, especially about themedia design, editing and publishing, the media comprehensive information managementmodules. The advanced digital television processing technology, P2P technology andmessage processing technology are used in this platform. Considering the accessibilitycompatibility of PIS system, SOA architecture is adopted to collect the data from each line.The network construction and operation of is the development trend of PIS. The integrationservices platform will further advance the line network broadcast control center constructionand improvement. It will increase the level of operational management, and expand on thesubway passenger services, in order to get the maximum social and economic benefits. At the end of this dissertation, to Beijing Subway Line14PIS project as background,the PIS integration services platform is implemented to test the functions and applicationeffect.This dissertation conducted in-depth research on PIS key technology. The majority ofthese research results obtained in system construction have been verified. These findings areimportant reference for future research and construction systems to promote of passengerinformation establishment of systems theory and the actual construction of the system hasimportant theoretical and practical significance. |
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