RLV末端能量管理段轨迹实时生成算法研究

采用类似于航天飞机的末端能量管理段飞行轨迹结构,将可重复使用空间飞行器(RLV)飞行轨迹分为搜索飞行、航向校正以及预着陆飞行三段进行待飞距预测,并利用三次多项式表示飞行器高度-待飞距剖面。通过调节航向校正锥位置和半径的方法调整待飞距,提出了RLV末端能量管理段飞行轨迹的实时生成算法。该算法考虑了整个末端能量管理飞行阶段的轨迹约束,给定末端能量管理段的起始条件,能实时筛选并生成一条满足要求的参考轨迹线。计算结果验证了该方法的合理性。

On-Line Terminal Area Energy Management Trajectory Planning for a RLV

Utilizing the basic structure of the shuttle's terminal area energy management(TAEM) trajectory planning,the trajectory of a reusable launch vehicle(RLV) in the TAEM flight is divided into acquisition,heading alignment and prefinal phase for ground track range(GTR) prediction,the altitude-vs-GTR profile is defined as a cubic polynomial,the GTR is regulated through adjustment of the location and radius of the heading alignment cone(HAC).Based on these,a on-line TAEM trajectory planning algorithm is developed,the algorithm is able to generate a reference trajectory which satisfy the TAEM requirement, trajectory constraints such as dynamic pressure,load factor and Mach number at the start of HAC turn can be easily treated in the algorithm.