基于输出重定义的再入飞行器动态逆姿态控制

再入飞行器仅使用两个体襟翼对姿态进行控制将导致横侧向运动中包含不稳定内动态。针对这一欠驱动问题，提出基于输出重定义的动态逆控制方法。采用输出重定义技术使零动态局部稳定，通过极点配置提高零动态的鲁棒性，对重定义输出系统进行反馈线性化从而设计动态逆控制器。仿真结果验证了该方法能确保零动态的稳定性，并显示出在镇定侧滑角的同时对攻角指令和倾侧角指令良好的跟踪性能，通过与反推力控制系统（RCS，Reaction Control System）单独控制的结果进行比较，表明该控制方法仅依靠气动舵面就能实现姿态的稳定控制，既节省了燃料，又减小了飞行器的结构复杂度，并且增大了飞行器的有效载荷。

Inverse dynamic attitude control for re-entry vehicle based on output redefinition

Internal dynamics occurs in the lateral/directional motion of re-entry vehicle with two body flaps under the condition of high angle of attack. A method of inverse dynamic control based on output redefinition technique was presented. The output-redefinition technique was used to locally stabilize the zero dynamics. A pole placement strategy enhanced the robustness of the zero dynamics and then provided feedback linearizes of the output-redefinition system to design the inverse dynamic controller. Simulation results show that the zero dynamics is stable and the tracking performances of attack angle and bank angle are very well while sideslip angle is stabilized to zero. The simulation results compared with reaction control system (RCS) control demonstrate that stable attitude control can be realized only by two aerodynamic control surfaces and the complexity of the vehicle structure can be reduced meanwhile the payload can be incerased.