Compound tracking in ATP system for free space optical communication

Free space optical (FSO) communication is also called as wireless optical communication. It does not require any wired channel as transmission medium. FSO is a kind of communication technology which transmits information through vacuum or atmosphere. In order to realize point-to point communication, space optical communication needs to establish a reliable communication link. The traditional coarse tracking technology has been very mature, but low tracking precision is still the main defect, in order to realize high accuracy tracking (arc-second), compound tracking technology is generally adopted. This paper presents the key technology of free space optical communication-ATP. The main research is about compound tracking technology, including the design of coarse tracking and fine tracking control system.