Robust Two-degree-of-Freedom Control for Flexible Spacecraft

This paper illustrates the robust control laws for the attitude control of a class of communication satellites that are equipped with large deployable antenna reflectors and large solar arrays. A two-degree-of-freedom controller which consists of a static output feedback controller and a feedforward controller is designed for this linear parameter varying system based on Hen control theory. In order to reduce the complexity of the controller, only one feedforward controller is proposed and the system performance is also guaranteed. To provide reference for similar design of controller, both the Riccati-based and LMT-based approaches are discussed in the solution procedure of the feedforward controller. The simulation results demonstrate the effectiveness of the robust control law.