RLV再入段六自由度制导控制律设计

针对RLV再入段六自由度制导控制问题,给出了一种结合高阶滑模跟踪制导律和带干扰观测器的Backstepping姿态控制律的综合制导控制架构,实现了高精度通用RLV的再入六自由度轨迹跟踪的设计与仿真。以HORUS-2B飞行器为研究对象,基于约束预测校正方法规划了再入标称轨迹;针对轨迹运动方程建立了基于高阶滑模的纵向轨迹制导律和侧向制导逻辑,设计了带有干扰观测器的Backstepping非线性姿态控制器,保证RLV姿态角跟踪的快速性和精准度,并将制导系统与姿态控制系统有效融合。通过蒙特卡洛仿真证明了设计的六自由度制导控制律具有良好的轨迹跟踪和较强克服模型不确定的能力。

Six-DOF Guidance Control Law Design for RLV Re-entry Flight

An integrated high order sliding mode guidance law and backstepping attitude control scheme is proposed for six-DOF guidance and control,thus achieving high precision six-DOF trajectory tracking of universal reusable launch vehicle(RLV).HORUS-2B vehicle is taken as object of study and the constrained predictive correction method is used to plan the reentry nominal trajectory.The longitudinal trajectory guidance law and lateral guidance logic are established based on high order sliding mode by the trajectory motion equations.The Backstepping attitude control law with disturbance observer is designed to guarantee timeliness and precision of attitude angle tracking,and this system is integrated with the guidance system effectively.Monte Carlo simulation shows that the six-DOF guidance control law designed possesses a good trajectory tracking accuracy and strong ability and its model uncertainty is overcome.