基于反馈线性化及滑模控制的俯冲机动制导方法

以高超声速飞行器为研究对象,针对俯冲段精确制导及机动突防问题,基于反馈线性化与滑模控制研究了机动突防滑模跟踪制导方法。首先设计纵向俯冲及侧向机动弹道,其次利用反馈线性化将非线性运动方程转化为线性方程,基于该线性方程利用滑模控制对已设计的弹道进行跟踪,最终将线性跟踪制导律转换到非线性系统中获得非线性滑模跟踪制导律,该制导律完全基于飞行器当前运动状态,所需的相对运动信息大大减少。CAV-H飞行器制导实例仿真表明,该方法能够实现俯冲段精确制导及机动飞行,且对初始及过程偏差具有较强的鲁棒性,能够为高超声速飞行器俯冲段制导提供有益参考。

Diving Guidance with Maneuver Based on Feedback Linearization and Slide Mode Control

The slide mode tracking guidance strategy for hypersonic vehicle that can realize both precise guidance and maneuver flight is investigated in this paper. First, the diving trajectory which can satisfy terminal constraints in longitudinal direction and the maneuvering trajectory are designed. Second, with the aid of feedback linearization, the nonlinear motion equations are converted into linear ones, which can be used to track the designed trajectories. Besides, in order to improve the guidance performance, slide mode tracking guidance law is proposed and the law is converted into nonlinear system to get nonlinear slide mode tracking guidance law. The guidance law is consists of the current motion states completely, therefore, the relative motion information can be decreased enormously. Finally, the results of a CAV-H vehicle guidance test show that the algorithm can realize maneuver flight and high precision guidance under the path constraints even if the outside disturbances exist. Therefore, it can offer references for precision guidance and maneuver penetration for hypersonic vehicle in dive phase.