${\mathcal{L}}_{1}$ adaptive control augmentation for a six-degree-of-freedom hypersonic vehicle model

Abstract

In this paper, we present the design of an ${\mathcal{L}}_{1}$ adaptive control augmentation system for a six-degree-of-freedom generic hypersonic vehicle model. We focus on addressing system uncertainties, which lead to undesired performance if not properly addressed in the control design. The design begins with the development of a nonlinear dynamic inversion system as the inner-loop controller, which achieves linearization between system inputs and outputs. Linear feedback controllers are then designed as a baseline control system. In addition, the ${\mathcal{L}}_{1}$ adaptive control architecture is used to develop augmentation setups to enhance the control performance of the baseline controllers in the presence of system uncertainties and disturbances. The simulation results demonstrate that the proposed augmentation scheme improves the overall control performance and enhances the robustness of the control system.