Attitude Control for Spacecraft with MSGMW based on Sliding Mode Controller and Extended State Observer

Magnetically Suspended Gimbaled Momentum Wheel (MSGMW) can stabilize three-axis attitude of the spacecraft in small angle range, with the advantages of reducing actuator number, minimizing cost and enhancing reliability. In this paper, the attitude control problem of spacecraft with only one MSGMW is investigated. The nonlinear coupled dynamic model of this problem is deduced, as well as its linear simplified model. The control strategy is also discussed. The desired control torque is brought to divide the system into two loops, namely, the outer attitude control loop and the inner gimbaling angle control loop. Sliding Mode Controller (SMC) with Extended State Observer (ESO) for attitude control loop is employed to reject external disturbance and inertial parameter uncertainty. The efficiency and performance of the controller is demonstrated by numerical simulations.