High precision control design for SGCMG gimbal servo system

Single gimbal control moment gyroscope (SGCMG) is used as the actuator of attitude control system for modern satellites. High precision control of the SGCMG gimbal servo system is difficult to achieve because of the existing multi-source and strong coupling disturbances. In this paper, multi-source disturbances are modeling, meanwhile, a high precision controller is designed, including a variable structure controller (VSC) and an adaptive feedforward controller (AFC). VSC guarantees steadiness and robustness of the system utilizing its characteristics of invariance and robustness, and AFC specially compensates the high frequency disturbances created by unbalance and vibration of the high speed rotor, utilizing its characteristics of adaptive close-loop regulation. Simulation results show that the proposed method attenuates the multi-source and strong coupling disturbances more efficient comparing to the existing methods, and can achieve high precision control.