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针对高超声速飞行器多种过程及终端约束滑翔制导问题,提出一种基于反馈线性化及滑模控制的纵向跟踪制导方法。首先设计了可满足滑翔走廊及终端约束的阻力加速度-能量(D-E)剖面;将简化的纵向运动方程转化为基于阻力加速度及其一二阶微分的非线性方程,并对其进行完全反馈线性化;最后基于该线性方程,利用滑模控制对已设计的剖面进行跟踪。CAV-H飞行器仿真分析表明,该制导方法能够实现高超声速飞行器滑翔段高精度制导,并对初始及过程偏差具有良好的鲁棒性。
Aiming at a variety of processes of hypersonic vehicles and terminal constrained gliding guidance, a longitudinal tracking guidance method based on feedback linearization and sliding mode control is proposed. Firstly, a resistance acceleration-energy (DE) profile that satisfies gliding corridor and terminal constraints is designed. The simplified longitudinal motion equation is transformed into a nonlinear equation based on drag acceleration and its first and second order differentials, and the feedback linearization Finally, based on the linear equation, the designed profile is tracked by sliding mode control. The CAV-H aircraft simulation analysis shows that the guidance method can achieve high-precision guidance of hypersonic vehicle gliding section, and has good robustness to initial and process deviations.