Subway Train Communication Network Data Communication Subsystem In Realization And Application

The underground rail traffic is a significant sign for a city to be a metropolis. It can not only to show the strength of the national capabilities, scientific and technology lever, but also an efficient traffic mode which meet the need to relieve the traffic tension. With the development of the economy and rapid increase of population, there are more and more people transfer from suburbs to cities which lead the traffic problem to be worse and worse. Above, invest construction of underground will be one of the most efficient method.A rail transit system is composed of vehicle system, signal system and power-up system. For the rapid development, each system’s technical equipment is about "mix between new and old", but the high density operation bring huge pressure to the relevant system. Most of the city subway systems are becoming intricate and complex, the stability of operation is taking test, while the failure rate is increasing. This essay is based on the data transmission system belonging to the engineering signal system of Hangzhou subway line one. It analyze the disturbed condition, propose solutions to the question of train-to-ground wireless signal to make sure transfer the bidirectional data link normally, reduce the failure rate, ensure the data security and reliability, and index national standardization. It principally analyze the main interference of the subway environment,802.11wireless transmission protocol, applications of this protocol and solutions. At last, it probe into the feasibility of RPP used in this system.