Adaptive Regulation of Hypersonic Vehicle Systems with Partial Nonlinear Parametrization

Abstract

This paper proposes an aerodynamic model modification using a curve-fitting technique based on certain on-orbit aerodynamic data, and designs global adaptive controllers for a class of nonlinearly parameterized hypersonic vehicle systems. To deal with nonlinear parametrization, parameter separation, coordinate transformation and functional bounding techniques are used. Adaptive backstepping controllers are designed to achieve global adaptive non-zero equilibrium point regulation of the nonlinearly parameterized hypersonic vehicle system. A main implication of this result is that the state variables in the uncertain model of hypersonic vehicle systems may be allowed for global non-zero equilibrium point regulation which is more general than some similar results seen in the literature which only achieve system stabilization or zero equilibrium point regulation.