多约束RLV快速再入轨迹规划

Rapid Trajectory Reentry Planning for RLV with Multi-Constraints

研究了一种多约束的重复使用运载器(RLV)三自由度快速再入轨迹规划方法。对于高超声速远程的情况,考虑地球旋转对轨迹规划的精度影响较显著,提出了完整的拟平衡条件;将RLV再入过程划分为两段:初始下降段和滑翔段。首先,将再入走廊转化为控制量的上下边界,在搜索满足航程的控制量时引入近似的纬度和航向角;其次,以终点航程横向偏差为依据迭代搜索改变倾侧方向的时刻;最后,提出航程修正的方法,进一步提高终端落点的精度。通过仿真验证了快速轨迹规划的有效性。

A methodology is developed for fast design of 3DOF entry trajectories of RLV with multiple constraint conditions.As the earth rotation cannot be safely ignored in long-range hypersonic entry condition,an integrated quasi-equilibrium glide condition is presented.Reentry trajectory is divided into two phases： initial descent phase and glide phase.Reentry corridor is translated into bank angle boundaries.Using the approximate latitude and azimuth angle in searching a bank angle,fitting the downrange.Using the lateral error as criterion for lateral iterative regulation.A range correcting method is developed to improve the final position＇s precision.Simulations have been presented to demonstrate the capability and effectiveness of the algorithm.