Based On Web Services Distributed Remote Monitoring Of Railway Signaling Power Supply System

Because the railway needs high stability for the signal power, the railway signal power system uses "Automation Obstruction" and "Electric Perforation'' that is double redundant power supply. Whether the double power supply equipments can work smoothly is an important factor in relation with the safe carrying of the railway. This thesis designs a distributed remote supervisory system and this system can supervise the double power supply equipments remotely of all the railway bureaus in the country through Internet, satisfying the railway management department 's real needs.This thesis firstly introduces the development of distributed application system. Presently, the application programs become more and more loosing coupling and are divided into several components, distributed to different computers. The main aim of the distributed application system is that the application programs can use different kinds of resources on different computers. With the development of the Internet, the distributed architecture based on Web Service becomes an important develop aspect of distributed application system.The second part of this thesis compares the distributed object technologies and analyses their adapting situations. To the traditional distributed object technologies,when they are used in the internet to integrate distributed application systems, it's very difficult to integrate different component models because of their using of different data encapsulation standard. But Web Service is a loosing coupling, reusable, distributed calculating architecture. It allows coding programs with different coding languages on different platforms. It communicates in standard way, improve the system's compatibility to make good use of the resources.Based on the analysis above, the distributed Railway Signal Power Remote Supervisory System adopts the B/S three layers web architecture based on Web Service. The toppest layer is presentation layer, mainly facing to the users, and accepting the users' request; the second layer is business logic layer, encapsulating component modules, providing the system logic control functions; the last layer of this system is the Data layer, exchanging data with the database. In the business logic layer, Web Services divide the business logic into Web Service modules and integrated in the layer, in this way there are several layers in the business logic layer.This layer is dynamic, and can obtain resources from the Internet. But the traditional web application servers are difficult to do this.This system includes five function modules. The User Login Module is responsible for user identity authenticating; the Real-Time Data Module is responsible for the Real-Time data processing; History Data Module is responsible for the history data processing of the supervising equipment; the Print Module is responsible for the user selecting information's printing; the System Information Maintenance Module is responsible for the bureau information and the user information's maintaining.This thesis have four break points as below: realizing the three layer B/S architecture under .NET Framework, using Web Service to integrate distributed system's function module, using SOAP protocol and XML protocol to realize system data's remote transport, using COM+ server based C# program language to design and realize system's Real-Time database. They guarantee the system's validity.At last this thesis provides the Railway Signal Power Remote Supervisory System's design and instance.