Robust H8 Control for Inter-satellite Optical Communication Terminal Antenna

Stability of antenna control system is very important to optical communication system. The disturbance moment of periscope antenna servo system arising from friction and eccentricity of outer space were analyzed. Disturbance moment was converted into a low frequency perturbation added to the brushless direct current motor (BLDC). When model uncertainty and perturbation exist simultaneously, the terminal closed-loop system is still quadratic stability by using state feedback method. By using the linear matrix inequality (LMI) criterion, the design of no-fragile state feedback controller was proposed under the condition of disturbance attenuation of quadratic stability. Finally, the BLDC model of communication terminal was investigated, and the antenna controller was calculated by LMI toolbox. The simulation proved that the controller resisted moment disturbance problem effectively.