Nonlinear backstepping control of reentry warhead with hybrid actuators

A novel set of hybrid actuators with single control moment gyoscopes(SGCMGs) and moving masses are proposed to control a reentry warhead attitude, Since the hybrid actuators are both mounted inside the warhead directly, the ablation of them can be prevented and the aerodynamic shape can be preserved. Considering of the nonlinear and strong coupling characteristic of the reentry warhead dynamic model, A nonlinear attitude control system is designed based on backstepping method which has structured and systematic advantages. This controller has strong robustness, can achieved the two-loop control of the warhead attitude angular velocity and attitude angle. Simulation results demonstrate that the attitude controller has a high control precision and is effective.