带有时间约束的再入滑翔轨迹设计

为了满足飞行器协同飞行任务需求，本文研究了带有时间约束的再入滑翔轨迹设计方法。首先，建立了合理假设条件下的再入滑翔运动模型，并且提出了一种再入滑翔轨迹分段方法。其次，针对不同飞行段特点及任务需求，分别设计了各段导引律。其中，重点推导了滑翔段飞行剩余时间和剩余航程的解析解，将剩余飞行时间与末制导交班点速度建立对应关系，运用解析预测-校正思想，通过在时间调整段和能量调整段调节倾侧角翻转时机和幅值，同时满足末端能量和时间约束。最后，通过理论分析与仿真校验说明了本方法的有效性及鲁棒性。

Reentry Trajectory Planning with Flight Time Constraints

In order to satisfy the requirements of a hypersonic cooperative flight mission under complex constraints, a designed trajectory planning method with time constraints is introduced. Firstly, a reentry gliding motion model is established, and a method of reentry gliding trajectory segmentation is proposed. Secondly, for every flight segment, different guidance laws are designed and the analytical solutions of the remaining flight time and range in glide phase are derived. The analytical relationship between the remaining flight time and final velocity is established. By the analytical prediction-correction method, the timing and amplitude of the bank angle are designed in the time and energy adjustment period to satisfy the end energy and time constraints. At last, the algorithm is proved effective and robust by theoretical analysis and simulation.