New Tracking-Control Strategy for Airbreathing Hypersonic Vehicles

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Abstract
This paper focuses on the tracking problem for airbreathing hypersonic vehicles, and proposes a new control method on the basis of not canceling, but using, aeropropulsive, as well as elevator-to-lift, couplings to design controllers without strategically avoiding or reducing the nonminimum-phase characteristic. The controllers and the external reference trajectories are simultaneously obtained by solving a system of linear algebraic equations. The altitude error is shown to be asymptotically stable. The velocity, flight-path angle, angle-of-attack, and pitch-rate errors all exponentially converge to zero with the proposed tracking controllers. The suppression of the flexible dynamics is achieved by integrating the new control method with H∞ control. To enhance the robustness of the controllers with respect to the uncertainties of the aerodynamic parameters, a nonlinear disturbance observer is proposed to estimate the variations of the aerodynamic parameters for airbreathing hypersonic vehicles during cru...

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