Trajectory tracking law for hypersonic vehicles based on H_∞ robust dynamic inversion

In virtue of the precise linearization function of nonlinear dynamic inversion,a drag acceleration-energy trajectory tracking law is proposed combined with H∞ control method.By dynamic inversion,the nonlinear hypersonic vehicle system is equivalent to a linear object.Considering both unstructured uncertainties and parametric uncertainties,the H∞ control method is employed to design a robust controller so as to achieve good tracking performance.Robust stability of the closed-loop system under this tracking law is proved.Simulation results show the effectiveness of the proposed method.