飞船跳跃式再入第一次再入能量管理方法

针对探月飞船跳跃式再入第一次再入能量管理问题，设计了一种能量管理方法。首先，采用大倾侧角再入，快速进入能量管理阶段；然后，对能量耗散速度进行控制，并预估跃起点的能量以确定飞船的跃起时机；最后，在能量管理结束后按设计指令过渡到跃起点。为检验能量管理方法的有效性及鲁棒性，基于标准轨迹法设计制导律，并进行仿真分析。仿真结果表明，该能量管理方法能改善轨迹跟踪性能，提高再入制导方法的精度和鲁棒性，并避免飞船在一次再入和二次再入过程中出现较大过载的现象。

Energy Management Method for Capsule Skip Reentry in First Entry

A new energy management method is proposed for the energy management problem in lunar capsule skip reentry. Firstly, a full bank angle method is adopted to accelerate entry energy management phase. Thereafter, the dissipation of energy is controlled and the energy at a bounce point is predicted at the same time to determine the right bounce time. Lastly, guidance command is designed to transit to the bounce point after the energy management phase. A reference trajectory guidance law is proposed to test validity and robustness of the energy management method. The numerical simulation results demonstrate that tracking performance for the reference trajectory is improved, both accuracy and robustness is improved by using the energy management method. Besides, oversize overload occasions in first entry and second entry are evitable.