某RLV飞行器投放轨迹的设计与分析

对于可重复使用发射式飞行器RLV(Reusable Launch Vehicles)设计投放轨迹,并作轨迹特性分析.根据投放几何和飞行器性能约束确定目标轨迹,将轨迹分为四个阶段,分别为:消耗多余能量的S型转弯段;改变飞行器航向并转向航向校正圆柱HAC (Heading Alignment Cylinder)的过渡飞行段;航向校正圆柱段;进一步调整能量以满足终端要求的着陆前飞行段.在各段衔接处设置窗口检查,在轨迹仿真过程中对轨迹进行进一步调整,得到投放轨迹.作为导航和控制的参考轨迹,还对飞行器进行了沿轨迹的操稳性分析和检查.结果表明所建立的轨迹设计方法能够提供满意的精度;轨迹对常值扰动敏感,对高频扰动不敏感.

Design and analysis on dropping trajectories of RLV configuration

The flight trajectories of a RLV(reusable launch vehicles) configuration were designed and the flight dynamics were analyzed along the trajectories. The whole flight process was divided into four phases as the S-turn phase to dissipate extreme energy, the acquisition phase to turn the vehicle for the HAC (heading alignment cylinder), the HAC tracking phase to head the vehicle for the runway and the pre-final approach phase to fit the vehicle to landing. The trajectories were further adjusted at checking windows. The dynamics of the configuration was then analyzed in terms of the sensitivity, control and stability along the trajectories for the navigation and control law design. The results show that the established trajectory design method works well with satisfactory precisions, while the designed trajectories tend to be more sensitive to the lower frequency disturbances than high frequency disturbances.