再入快速抵达轨迹优化设计方法

Method of trajectory design and optimization for fast reentry arrival

针对再入初始速度大、飞行时间约束苛刻的轨迹设计问题,提出一种基于遗传算法和攻角+倾侧角联合优化的再入快速抵达轨迹优化设计方法。该方法在再入初段利用较大攻角迅速减小弹道倾角和拉平弹道,在再入后段/滑翔段联合设计和优化攻角+倾侧角变化规律以显著降低终端飞行速度,同时满足终端高度、终端航向角、最大动压、最大热流等约束条件。该方法能够提升传统升力体飞行器再入快速到达能力并拓展其应用范围。仿真结果表明,在典型飞行器参数和较大初始再入速度条件下,全程飞行时间小于12 min,终端速度能够小于7Ma,横向机动距离超过800 km。

A method of trajectory design and optimization for fast reentry arrival was proposed for the applications of large reentry velocity and strictly constrained flight time. The proposed method quickly decreased trajectory inclination and flattened trajectory on the initial reentry stage using large attack-angle, and the attack-angle and bank-angle variation rules on the later reentry stage and glide stage were jointly designed and optimized to significantly decrease terminal velocity and satisfy the constraints of terminal height, terminal heading and maximal dynamic pressure, maximal heat, etc. The proposed method can increase the ability of fast arrival for traditional lifting body vehicle and expand its application. Simulation results demonstrate that the terminal velocity is less than 7Ma and the lateral maneuver capacity is greater than 800 kilometers in the 12 minutes of flight time under the condition of typical vehicle parameter and large reentry velocity.