Abstract:At hypersonic speed, strong nonlinear couplings and uncertainties bring enormous challenges to the control of a hypersonic flight vehicle. To study the coupling relationships, a new coupling analysis method is accomplished for the group of state variables and input variables by using statistical sampling method. Then, a new hierarchical coordinated control strategy, which combines a coupling compensator and a robust controller, is proposed to reject the coupling effects of the velocity subsystem and the altitude subsystem. In the attitude subsystem of longitudinal system, a coordinated transformation technique is introduced to solve the directive derivative coupling. The stability of the closed-loop system is analyzed by using Lyapunov theory. Simulation results demonstrate that the proposed controller can effectively coordinate the coupling impacts.