Application of Characteristic Model Based Decentralized Adaptive Attitude Control in the Hypersonic Vehicle

In the course of the reentry of hypersonic vehicles,many difficulties such as strong coupling effects,drastic external disturbances,and large uncertainties of aerodynamic parameters make the design of guidance and control system very challenging.In response to that,the original nonlinear dynamics are transformed into the MIMO characteristic model in the form of two-order time-varying difference equations,and a decentralized adaptive attitude controller is designed.At last,the stability is proved and some simulations are presented.Because the closed-loop system is a very complex hybrid system,and a valid stability analysis has been absent in the characteristic modeling theory,the method proposed in this paper is used to absolutely handle the stability problem of MIMO system with a relative degree of two and without internal dynamics.