The Application And Study On Video Surveillance System Of Railway Based On WLAN

The thesis comes from the project of "Video Surveillance System of Railway from Tianshui to Lanzhou" of politics and law committee of Gansu province and railway bureau of Lanzhou city.With the rapid development of WLAN and video surveillance technology, wireless video surveillance technology embeds in the life of people more and more. In this environment, wireless video surveillance technology applies to the long-distance railway. According to the structure, the system is divided into front-end monitoring, signal transmission part and the monitoring center, and the part of signal transmission is the focus of this paper. The whole net is the combination of fiber-optic cable and wireless transmission, and the section is departed according to fiber access of mouth. In the wireless transmission of the railway, it is adopted that "string of pearls" bridge relay mode of back-to-back, the bandwidth of the frontal bridge is consistent with the one of the after in the mode. According to the technical requirements and weather reasons, we choose the grid parabolic antenna in the designing, the circle is used to the feed, the good results have achieved practically.In the WLAN environment, there are many forms of wireless interferences, the topology structure is obtained through classifying the interferences, the probability density of interference level is figured through mathematical derivation.The smooth operation of the system shows that the overall structure of the system is correct; it provides a basis for the future.