Abstract
Satellite attitude control is normally performed with actuators such as CMGs, reaction wheels. This research considers a novel type of 3-DOF actuator that uses a spinning wheel and tilt mechanism, which has less mass, more simplicity and is singularity-free during nominal operation in comparison to existing actuators. A novel high-performance bounded LQR control law is also presented which is capable of gain-scheduling its parameters. High-fidelity 3-DOF simulations demonstrate feasibility for both wheel and control law.