【摘要】 针对亚轨道飞行器初期返回段不确定性导致末端落点散布范围较大、从而无法满足TAEM段窗口的问题，提出一种基于轨迹数据库的轨迹设计方案。给出纵向质点动力学方程，研究不确定性和约束条件对轨迹设计的要求；在充分考虑飞行器飞行能力的前提下，根据SLV进入初期返回段时的状态规划速度-迎角剖面，同时分析不确定性对轨迹设计结果的影响；通过将不确定性重新组合进行轨迹数据库设计。综合仿真表明：采用该方法进行轨迹设计不仅可以满足动压和过载等过程约束以及终端约束，并且对不确定性具有良好的适应能力，具备一定的实用价值。更多还原

【Abstract】 A trajectory design scheme based on trajectory database is proposed to deal with the uncertainty of the initial reentry of suborbital launch vehicle which results in a large dispersion range of end impact points in failure to meet the TAEM segment window. The longitudinal particle dynamic equation is given to study the requirements of uncertainty and constraints on trajectory design. On the premise of full consideration of the aircraft flight capability, the velocity angle of attack profile is planned according to the state when the SLV enters the initial return phase, and meanwhile, the influence of uncertainty on trajectory design results is analyzed. The trajectory database is designed by recombining the uncertainty. Comprehensive simulation shows that the proposed method can not only meet the process constraints such as dynamic pressure and overload, but also has good adaptability to uncertainty provided with certain practical value.更多还原