Research And Application Of Wireless Digital Microwave Communication Technology In Video Surveillance Of Reservoir System

With the development of communication technology, video surveillance has played a more important role in reservoir system. Site personnel can do work which they dealt with outside before in central control room by means of video surveillance, such as patrol, monitoring of realtime water level and so on. Because of geographical restriction and high cost, it isn't feasible for us to carry out wired video surveillance by cable or optical fiber in the reservoir system. Meanwhile, network security problem will be caused in public network by rising wireless communication technology which we should not apply, such as 3G, VPN, and so on. However, wireless digital microwave communication technology which is neglected by us can solve those problems above.This paper introduces wireless digital microwave communication technology as object of study, describes microwave propagation in different conditions, and revises relevant parameters because of the negative impact on microwave communication which is caused by spherical earth surface, atmospheric refraction and so on; According to the request for technology, it analyses and chooses relevant frequency range, standard of wireless local area network (WLAN), transmission bandwidth, location of receiver and so on; It compares direct sequence spread spectrum (DSSS) with frequency hopping spread spectrum (FHSS) and chooses DSSS to carry out anti-jamming; It designs wireless digital microwave communication system based on DSSS in Matlab/Simulink software platform, sets up real communication system based on wireless bridge mode and configurates relevant parameters in software platform. Finally, it proves that the wireless digital microwave communication system is achievable in long-distance communication, anti-jamming and remote video surveillance, after simulation in Matlab/Simulink and debugging in the campus.The achievement of this paper are as follow:1. It applies wireless digital microwave communication technology to carry out information communication, remote video surveillance and anti-jamming and solve problems of difficulties of wired transmission and communication in the public network.2. It applies DSSS to achieve anti-jamming based on traditional wireless digital microwave communication system.3. It presents solutions to hardware platform construction and software platform configuration and makes successful debugging.4. It constructs wireless local area network to work out interconnection in the reservoir system.Although the designed communication system can carry out wireless information communication, remote video surveillance and anti-jamming, we could make improvement in the faster transmission, combination of DSSS and FHSS (frequency mixing technology), revise of Doppler frequency shift and so on.