铁路智能运输系统通用信息平台的设计与实现

Design and Development of Common Information Platform for Railway Intelligent Transportation System

为全面解决铁路智能运输系统(RITS)各业务系统间的互连问题,保障信息采集、传输、管理及共享功能的顺利实现,提出按照站段级、路局级和铁道部级3层管理模式开发建设RITS通用信息平台的总体思路。整个平台系统分为数据抽取、查询处理、模式集成信息管理、语义冲突处理、局部成员代理、数据字典、综合交通信息发布和应用服务等8个功能模块。根据铁路各信息系统的特征,给出通用信息平台的具体实现方法。采用OLE DB和ODBC API函数屏蔽数据模式的差异,连接和抽取异构数据,创建数据字典;XML作为公共数据模型用以消除异构关系数据的异构性和多语义性;利用CORBA(Common Object Request Broker Archi-tecture)技术和元数据技术构建应用服务器和元数据库,达到已有异构系统以及新建系统通过通用信息平台实现有效集成。

To solve the interoperation problem of each function system of Railway Intelligent Transporta tion System （RITS） and ensure information collection, transmission, management and sharing, common information platform of RITS must be constructed. The unitary thought of constructing common informa tion platform for RITS is presented. The system is leveled into station and depot platform, railway bureau platform and Railway Ministry platform. The common information platform of RITS is composed of 8 function modules, i.e. data abstraction module, query management module, model-integrated information management module, semantic conflict processing module, local query agent module, data dictionary module, integrated traffic information issuance module and applying services module. According to the features of each functional system, the concrete implementing methods of platform system are brought forward, such as connecting and abstracting heterogeneous data and abstracting data dictionary via ODBC and OLE DB API. XML is adopted as common data model which mapping relational database model to eliminate the heterogeneity and semantic conflict. Application server is constructed with CORBA （Common Object Request Broker Architecture） and metadata database is established with metadata technology, which can ensure heterogeneous systems and new built systems interoperate each other via the common information platform system.