空间拦截器姿态的组合控制

Integrated control for space interceptor's attitude

当空间拦截器由中制导阶段转入末制导阶段时，受不确定因素的影响，其姿态可能与预定姿态相差较远。在这种情况下，拦截器必须进行大角度姿态机动。这时的姿态控制系统是一个非线性、多输入多输出耦合控制系统。在拦截器不滚转的前提下，上述复杂系统可以视为３个简单子系统的组合。在每个子系统中，应用变结构＋ＰＩＤ组合控制器，这样各子系统抗干扰能力强，收敛速度快，超调小，而且稳态精度高，无抖动。仿真结果证明了组合控制方法的有效性。

When the space interceptor transits intermediate guidance into terminal guidance, its attitude may deviate far from the expected state for some uncertain terms. Then, the interceptor has to maneuver with large angles and in this time the attitude control system is a nonlinear, MIMO, coupled system. Fortunately, such a complicated system can be viewed as a combination of three simple subsystems, if the interceptor's roll angle is zeroed. In each subsystem, a variable structure controller is integrated with a PID controller to make the subsystem robust to disturbances, and converge fast to the expected states with small overshoot, high accuracy and without chattering. Simulation results illustrate the effectiveness of the integrated control.