Dynamic output feedback L 2 – L ∞ resilient control of uncertain fixed-wing UAV under composite disturbances

For an uncertain fixed-wing unmanned aerial vehicle (UAV) system subject to composite disturbances, this paper proposes a disturbance observer-based dynamic output feedback resilient control scheme. Firstly, a coordination disturbance observer composed of multiple disturbance observers is designed to estimate external disturbances in real time, which makes the selection of observer gains more flexible. Then, L2−L∞ performance index is introduced to suppress energy-bounded disturbances. Subsequently, according to the disturbance observer method, dynamic output feedback control technique, and resilient control theory, a resilient tracking controller for the fixed-wing UAV is developed. Through Lyapunov stability analysis, the closed-loop augmented system is robust asymptotically stable and satisfies L2−L∞ index performance criteria. Finally, simulation outcomes indicate that the suggested control approach demonstrates excellent anti-disturbance performance, effectively enhancing the control accuracy and robustness of the fixed-wing UAV in complex environments.