| 摘要 |
PROBLEM TO BE SOLVED: To obtain a mobile free-space optical space communication unit that can surely acquire a signal. SOLUTION: An arithmetic processing unit 44 of a fixed station receives position information of a mobile station positioned by a GPS unit by using a receiver 45, calculates the direction of a transmission light L21 on the basis of information, and outputs a drive signal to a longitudinal direction drive section 46 and a lateral direction drive section 47 provided to a transmission/ reception optical system 35 so that the transmission/reception optical system in directed in the direction of the mobile station. When mobile station uses an angle detection element to detect the transmission light L21 emitted from the fixed station, the mobile station immediately enters a tracking operation, allows the longitudinal direction drive section 46 and the lateral direction drive section 47 to drive the optical transmission reception optical system 35 to direct a received light L22 emitted from the mobile station in a direction of the fixed station and the fixed station receives the light L22 to start mutual communication. |
