Hypersonic Vehicle Longitudinal Control Based on Sliding Mode Observer and Dynamic Surface Control

In this paper, a class of sliding mode observer and a dynamic surface control law are proposed for the longitudinal dynamics of hypersonic flight vehicle. The sliding mode observer is designed to estimate the angle of attack and flight path angle which are usually difficult to measure. Using the estimation results, the back-stepping-based dynamic surface control law is designed to avoid the explosion of complexity caused by continuous integration, and the control method is applied on the hypersonic vehicle longitudinal model to make the aircraft track the reference trajectory precisely. Simulation results have shown that the proposed methods perform well on the control and state estimation of hypersonic vehicle.