Predictive Finite-Time ADRC Based Longitudinal Control for Hypersonic Aircraft with Parametric Uncertainties and Unmodeled Dynamics

It is a significant issue to achieve the fast maneuverability and the strong robustness of hypersonic aircraft. Based on the thoughts of finite-time control and active disturbance rejection control (ADRC), this paper proposes a finite-time ADRC for controlling the longitudinal dynamics of hypersonic aircraft. The proposed design consists of three parts: finite-time feedback, finite-time estimation and estimating predictive modules. To avoid discontinuously changing of control input, the presented finite-time design is in a continuous form. Moreover, to overcome the delay phenomenon of estimation in the conventional ADRC, the predictive values of total disturbance and angular velocity are calculated based on Taylor expansion. The simulations for nonlinear uncertainties validate the effectiveness of the proposed method.