Research And Realization Of Protocol Auxiliary Analysis Tool Of CRH2EMU Communication Network

With the rapid development of high speed railway and the great achievement acquired in the country even as in the whole world, the research on the Train Communication Network has become very hot recently. As an important media for communication among different kinds of information units in the train, Train Communication Network plays a great important role in the run of high speed railway. Meanwhile communication protocol is the basic ensure of Train Communication Network. Whether the protocol is well run in the Train Communication Network plays an important role to the normal run of communication network even as the whole railway. So the analysis to the implementation of the protocol is pregnant to the ruly run of the Train Communication Network and to the safety and reliability of the high speed railway.The auxiliary analysis system designed by this thesis is used to analyze the implementation of the protocol that run in the CRH2Train Communication Network. The designing of the system is based on the National Science and Technology Support Project, Network System Virtual Simulation of High-speed Train Traction Drive and Train Network System, and relied on the platform of the CRH2communication network.This system has the following functions:(1)catching the packets which are transported in the communication network;(2)analyzing the implementation of the protocol(ARCNET) which runs in the network, the analysis includes three aspects:the first point is authenticate the encapsulation format of the packet, the second point is analyze different kinds of the packet and display their meanings and respect value in the interface, the third point is analyze and authenticate the principal of the protocol.(3)beside analyzing the implementation of the protocol, as there are a lot of application is communicated in the network (encapsulated in the PAC frame of ARCNET), so it is also necessary to analyze the implementation of the different kinds of application data. The analysis also includes three aspects:the first point is authenticate the encapsulation format of different application,the second point is analyze different kinds of application,and display their meanings and respect value, the third point is analyze and authenticate the principal of different application.The requirement analysis and overall design is first introduced in this thesis, then the detail design description of different modules in the auxiliary system is given, these modules include packet catching, analysis and authentication to different types of packet in the protocol, and to the principal of the protocol, analysis and authentication to different types of application, and to the principal of different application. Finally, the auxiliary analysis system.is tested with test cases.