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针对大升阻比高超声速飞行器滑翔再入制导问题,提出一种基于能量的混合制导方法.建立以能量为自变量的三自由度运动学方程,利用拟平衡滑翔特性将过程约束转换成倾侧角约束.纵向制导在初始下降段采用固定数值倾侧角飞行,在拟平衡滑翔段基于剩余航程随能量单调变化的特性将标准轨迹进行分段,然后分段进行在线预测校正制导.侧向制导基于横程与能量的近似线性关系,设计了由分段漏斗形横程走廊控制的倾侧角反转逻辑,以保证侧向制导精度.分析研究和仿真结果表明该方法易于实现,有效减小了制导指令的解算时间,制导和落点精度高,且对再入初始偏差及过程扰动不敏感.
Aiming at the problem of gliding reentry guidance for a large lift-impedance hypersonic vehicle, a hybrid guidance method based on energy is proposed, and a three-degree-of-freedom kinematic equation with energy as an independent variable is established. The process constraint is transformed into a roll angle by using the quasi-balanced gliding property The longitudinal guidance uses a fixed numerical tilting angle flight in the initial descent section and the standard trajectory is segmented in the quasi-equilibrium gliding section based on the characteristics that the remaining range changes monotonically with energy, and then the section is used for online predictive correction guidance.The lateral guidance is based on the horizontal And the approximate linear relationship between energy and energy, the tilting angle inversion logic controlled by the sectional funnel-shaped transverse corridor is designed to ensure the lateral guidance accuracy.The analysis and simulation results show that the method is easy to implement and the guidance instructions Of the solution time, guidance and placement accuracy, and the initial re-entry bias and process disturbances are not sensitive.