Solutions Research On The Weak Field Area Of 450MHz Radio Train Dispatching Communication System

Radio train dispatching communication system is the main component of the radio railway communication system, is the important communications facilities of organizing railway transport, protecting traffic safety, enhancing production efficiency. Traffic safety is directly impacted by its communication quality. Design Code clearly states: all sections should be set up Radio train dispatching telephone, its users out of tune in "railway technology management point of order" in specific provisions.To enable the two neighboring radio station reached between the field for cover, wireless receiver to receive the minimum level for, at the same time meet the requirements of the SNR, the field covered places and the probability of not less than 90 percent of the transmission system indicators, The key lies in its technical solution Tunnel, corners, cutting sections, such as weak field strength of the signal coverage area.Wireless out for systems engineering design must be based on the actual situation in a scientific and rational choice of wireless out for the weak field area solutions, to ensure good coverage of the field, train scheduling to meet the high reliability requirements.This paper first introduced wireless communications and the characteristics of China's wireless-communications systems are the status, composition, role, functions, format and frequency, and by this paper, the significance and composition of the article.This paper by the 450 MHz wireless-communications systems are in the propagation of radio waves from a theoretical analysis and use of simulation software and Hata model railway different topography of radio wave propagation path loss from changes in the law.This paper on China's wireless out for the weak field's most commonly used solutions (including: leaky coaxial cable and repeaters, optical repeater,interval relay means) a system, the system functions, typical Chains calculated that a detailed analysis and comparison.At the same time by this paper on the new line of the railway line and both are wireless-communications system renovation project, with the scene Takan data, field theory, engineering design feasibility studies, summed up the weak-field analysis of different areas of adaptability and solutions Economy.