子级垂直回收的一项关键技术是制导、导航与控制(Guidance Navigation and Control,GNC)技术.瞄准未来的组合体回收模式,结合现阶段发动机、着陆支架等环节的性能和特点,全面分析了返回过程中最关键的垂直着陆段对控制系统的需求和约束条件,研究了一种针对垂直着陆段的GNC技术,包含高精度导航算法、适应大推重比运载器快速下降模式着陆的凸优化在线轨迹规划与制导算法、适应大静不稳和晃动极零结构的参数优化设计以及基于自抗扰的高精度姿态控制算法.仿真结果表明,提出的技术可以满足设计需求.

A new method based on fuzzy logic is introduced to adjust parameters of nonlinear control in guidance law with finite time convergence.A finite time convergence theory is used to obtain bound of parameters,and then the influences for convergence are discussed.On the basis of fuzzy logic,an adaptive controller is designed,which is according to bound and influences mentioned.The simulation results show that the convergence of this improved guidance law is effective and high frequency chattering of acceleration is restrained.