Research On APT System For Free Space Optical Communication Based On GPS/MANET

Free Space Optical communication (FSO) is a communication technology in which the laser is used as a carrier wave and the information of voice, data and image can be transmitted with a high transmission rate through free space. FSO has advantages of great capacity, high transmission rate and high confidentiality, but the traditional systems mainly provide the communication between fixed-points, do not apply to the communication network in which the nodes are moving.In order to achieve the communication between moving nodes in space, this paper designs an APT structure based on GPS/MANET laser communication system. It describes the working principle and the structure composition of the APT system in detail, gives the control algorithm of antenna automatic alignment based on GPS. The simulation results prove the algorithm can make the target directly go into the coarse track view without scanning of the beacon light. It can achieve rapid pointing of the target and improves the APT performance. Finally, the paper gives the mathematical model and simulation results of the coarse tracking and the fine tracking respectively.