Attitude Control of Staring-Imaging Satellite Using Permanent Magnet Momentum Exchange Sphere

The attitude control of staring-imaging satellite using permanent magnet momentum exchange sphere (PMMES) is studied in this paper. The desired attitude and desired angular velocity of the satellite are analyzed firstly. The PMMES is applied to meet the requirement of miniaturization for staring-imaging satellite. In order to overcome the drawbacks of the control law based on the Lagrange dynamics model, the Kane method is applied to the PMMES for the first time, and the relationship between the control torque and generalized angular velocity of the PMMES is established directly. Then the dynamic model of staring-imaging satellite with the PMMES is established, and the kinematics model of satellite attitude is deduced. In addition, a PD controller based on disturbance observer is designed to achieve satellite staring task, and the sliding mode controller of the PMMES is designed to suppress the parameter perturbation and the external disturbance. Finally, the simulation results show the validity of the designed control law.