A novel kind of saturated controllers for spacecraft with bounded disturbances

A simple control framework is proposed for the saturated attitude control of spacecraft subject to bounded disturbances. The control framework is composed of three parts, i.e., the quaternion part, the saturated angular velocity part, and the bounded ant-disturbance part. Based on a useful lemma, the paper proves that this control framework can be simplified to a linear PD controller plus the anti-disturbance term in finite time. Depending on the forms of disturbances, the anti-disturbance part can also be of different forms. Two different saturated controllers are presented to exemplify the applications of the control framework. Finally, simulations are conducted to demonstrate the effectiveness of the proposed controllers.