Abstract:

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.