标准轨迹制导中准平衡滑翔条件优化研究

对于可重复使用运载器标准轨迹再入制导,准平衡滑翔条件可以将高度-速度平面内各项再入约束形成的飞行走廊,转换为倾侧角-速度空间内的倾侧角走廊.通过在倾侧角走廊内设计倾侧角曲线,可以生成满足飞行走廊的标准轨迹.通过论证标准轨迹再入制导过程中的准平衡滑翔条件及其物理意义,说明了由倾侧角走廊内的倾侧角曲线生成的标准轨迹,存在突破再入飞行走廊边界的可能性.通过对倾侧角走廊边界设置余度,极大地降低了标准轨迹突破再入飞行走廊边界的可能性,提高了标准轨迹的设计成功率.

Demonstration and Improvement of Quasi equilibrium Glide Condition in Reference Trajectory Reentry Guidance

For reference trajectory reentry guidance process for reusable launch vehicle, the reentry corridor calculated by various constraints based on altitude velocity plane can be translated to bank angle corridor based on bank angle velocity plane through quasi equilibrium glide condition(QEGC).Bank angle signal designed in bank angle corridor can generate a reference trajectory inside reentry corridor generally.This paper gives an argument of QEGC and its physical meaning in reference trajectory reentry guidance, and demonstrates the possibility that reference trajectory generated by bank angle signal inside bank angle corridor can exceed the reentry corridor.A method of setting bank angle corridor margin is proposed to reduce the likelihood of generating a reference trajectory which exceeds the reentry corridor boundary.This approach improves reference trajectory generating method effectively