基于H_∞鲁棒动态逆的飞行器轨迹跟踪方法

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

利用非线性动态逆方法的精确线性化功能,结合H∞控制理论,提出了一种阻力加速度-能量标准轨迹的跟踪方法。通过动态逆将非线性的高超声速飞行器系统等效为线性对象,继而考虑非结构不确定性及参数不确定性,采用H∞控制理论设计外回路鲁棒控制器,实现了标准轨迹的精确跟踪,同时给出了闭环系统的鲁棒稳定性证明。仿真结果验证了该方法的有效性。

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.