Adaptive Control of Hypersonic Vehicles Using Observer-Based Nonlinear Dynamic Inversion

2018, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved. Nonlinear dynamic inversion adaptive control is a useful technique that is robust with respect to parameter uncertainty and can be used to avoid gain scheduling when a nonlinear model of the system is available. This paper extends an observer-based nonlinear dynamic inversion adaptive control framework, previously developed by the authors for a longitu- dinal model, to the control of a full six degree-of-freedom hypersonic vehicle. Due to the high speed and high operating temperature of hypersonic vehicles, typical external sensors such as angle-of-attack and sideslip angle vanes cannot be used. The proposed controller utilizes a nonlinear observer to estimate these aerodynamic angles. Through a Lyapunov analysis, all tracking and estimation error signals are shown to be uniformly ultimately bounded, and the ability of this control architecture to track a commanded Euler angle trajectory in the presence of noise is demonstrated on a nonlinear, six degree-of-freedom generic hypersonic vehicle simulation.

Adaptive Control of Hypersonic Vehicles Using Observer-Based Nonlinear Dynamic Inversion Conference Paper