Satellite attitude tracking control under control saturation

The main problem addressed is Modified Rodrigues Parameter (MRP) based, attitude tracking control of rigid satellite. First a nonlinear control scheme is presented under control input saturation. The control scheme is shown to achieve global asymptotic stability for the whole tracking error states through a rigorous Lyapunov analysis. Then we give a control scheme not only to deal with the control input saturation but also error angular velocity constraints, and a detail stability analysis of the closed-loop is included. Numerical simulations are performed for the satellite attitude tracking control system and results demonstrate the effective of the proposed control schemes.