Fixed-time control for automatic carrier landing with disturbance

Abstract

This paper addresses the fixed-time control problem for automatic carrier landing. By transforming a six-degrees-of-freedom fixed-wing aircraft model into the affine form with angle of attack controlled by thrust independently, backstepping technique is able to be adopted as the main control frame. Subsequently, for the purpose of improving convergent performance and success rate for carrier landing, fixed-time control method for a high-order multivariable system is proposed, and it is applied to the automatic carrier landing control system. In order to realize complete fixed-time convergence performance for the closed-loop system, fixed-time disturbance observers are employed in the control structure to efficiently estimate the external disturbances. Moreover, nonlinear fixed-time filters are incorporated to avoid tedious derivative calculation without affecting the fixed-time convergence performance of the system. Finally, the comparative simulation results with other methods demonstrate the effectiveness and superiority of proposed fixed-time control scheme.