Study On Communication Control Techniques Of An Optical/Microwave Dual Transmission Links System

Wireless optical communications represents a high-speed, long-range and strongsecurity means of communication, but the bad weather such as rain and fog haveconsiderable influence on optical transmission, we need to build a microwave link asbackup to improve the communication quality. This article is doing research ofcommunication control technology in wireless optical /microwave double link systemand their mobile applications. About the problem of how to switch between main andsubsidiary link, this article firstverifies thatthe powerintensity in receiving can be usedas expression of channel BER and basis for switch. After that, it putts forward themodified RSTP protocol which handles the redundant link in second switch network isvery suitable for this handoff mechanism in mixed FSO/RF system. The schemeachieves our initial requirement by actual experiments. The APT system of wirelessoptical communication has been studied, focusing on the analysis of the servo tracking.To improve the performance , the paperproposes the use of variable structure control tochange the APT servo tracking system. It deduces the control program forthe APT andcarries out a simulation. Results show that the variable structure control has greatlyenhanced tracking accuracy. The paperalso studies the positioning programforwirelessbridge mobile communications. With the comparison of the all-directional antennas anddirectional antenna, directional antenna is selected. For the positioning information,GPS provides latitude and longitude information, electronic compass provides steeringinformation together. The article also designs the overall positioning system, and sets upthe whole antennaservo platform in theory...