Extended State Observer-Based Finite-Time Trajectory Tracking Control of Fixed-Wing UAV With Prescribed Error Constraint

This paper proposes a finite-time trajectory tracking control (TTC) for a fixed-wing unmanned aerial vehicle (UAV) by a fast non-singular terminal sliding-mode strategy. A second-order nonlinear model is established to transform the UAV outer loop dynamics. To estimate the external disturbance, an extended state observer with finite-time observation capability is utilized. Furthermore, the trajectory tracking errors are constrained within a bounded region by prescribed performance control. Finally, simulations are conducted to verify the effectiveness of the finite-time TTC scheme.