Anti-Disturbance Dynamic Surface Control for Air-Breathing Hypersonic Vehicles Based on NDO

Abstract

This paper is concerned with the anti-disturbance dynamic surface controller (DSC) design for an air-breathing hypersonic vehicle (AHV) based on nonlinear disturbance observer (NDO). For the longitudinal model of AHV subjected to the high nonlinearity, the uncertain parameters and the varying disturbance, the feedback linearization method is employed considering the uncertain parameters. Then, a dynamic surface controller is designed based on the inverse hyperbolic sine function to solve the problem of "explosion of terms" in the traditional backstepping control. Furthermore, in order to enhance the disturbance rejection ability, a novel NDO is designed to estimate the model uncertainties and external disturbances. Finally, the simulation results verify the superior tracking performance of the proposed control strategy.