一种基于解析规划的多约束再入制导算法

Reentry Guidance Research with Multi-constrain Based on Analytic Planning Method

提出了一种基于H-V剖面的亚轨道飞行器再入制导方法。将再入轨迹分为初始下降段和过渡段分别进行规划,初始下降段采用常值倾侧角飞行,过渡段则采用四次解析多项式进行描述,满足再入走廊约束和能量管理(TAEM)初始条件的同时提高再入轨迹在线规划速度;通过反馈线性化方法设计自适应控制律跟踪标准剖面,同时根据航向误差走廊确定滚转方向,从而完成纵向和侧向的联合设计。仿真结果表明,该制导方法对初始状态偏差和参数不确定性具有较强的鲁棒性。

A new reentry guidance algorithm based on H-V profile for reusable launch vehicles was presented. The reentry trajectory was divided into two phases to plan independently, initial descent phase and transition phase. In initial descent phase, a constant bank angle is used to control flight. In transition phase, a fourth order analytic polynomial is used to describe the H-V profile, which can both satisfy the constraints of reentry corridor and terminal area energy management interface, and improve the planning-efficiency. The technique of feed- back linearization is used to obtain an adaptive control law to track longitudinal profile; meanwhile heading error corridor is used to deter- mine lateral motion, which can complete the longitudinal and lateral integrative-design. Simulation results show that the guidance algorithm has strong robustness against initial state errors and uncertain conditions.