Study On Fine Track Control Technology Of APT System About The Free Space Laser Communication

Optical communication offers an attractive alternative in the fields of free-space communication and military affairs for its specialties of high-speed communication, large capacity, anti-jamming ability, small volume, low weight and low power expend. However, because of the narrow laser beam leading to challenges in laser beam pointing, APT (Acquisition, Pointing, and Tracking) technology certainty turns to the most important section and one of the key points in APT is controlling technology in fine tracking servo system.This paper designs APT numeric control compensator of fine tracking which adopts analog designing discrete method and establishes simulation model of fine tracking. Then we develop the fine tracking system sample, and testify the fine tracking capability on the test-bed. The result shows that the controlling precision can reach to 3μrad, which grounds the engineering reality of space optical communication system.