Parameter estimation based control of hypersonic aircraft with magnitude constraints on states and actuators

This paper presents the nonlinear adaptive controller for the longitudinal dynamics of a generic hypersonic aircraft in presence of parametric model uncertainty and magnitude constraints on the states and actuators. The velocity and attitude subsystems are transformed into the linearly parameterized form. The signal is filtered to produce the limited command signal and its derivative. Accordingly, the auxiliary error compensation design is employed and the parameter projection estimation is proposed based on the compensated tracking error. Considering the structure of the dynamics, the intermediate items from neighboring states are included during the controller design. The uniformly ultimately boundedness is guaranteed for the closed-loop control system. Simulation results show that the proposed approach achieves good tracking performance.