带碰撞角约束的高速飞行器小速度比交会制导律

针对目标飞行器速度较大引起的拦截器与目标速度比小于1的空间交会问题,建立拦截器与目标交会的三维运动模型,分析共面运动的碰撞角对相对速度及有效碰撞面积的影响并讨论交会的速度比条件. 基于初始预测的目标速度信息,根据准平行接近原则将碰撞角约束转化为交会过程中的视线角约束,应用变结构控制设计带视线角约束的三维制导律并分析其稳定性. 结果显示,设计的制导律不仅使视线角速率逼近于0,还可以实现以期望的碰撞角实施交会,并且对预测的目标速度偏差具有较强的鲁棒性. 

Guidance Law of Small Velocity Ratio Interception Against High-Speed Vehicle with Impact Angle Constraint

Tail chase, head-on interception and head pursuit guidance methods were described by impact angle. To solve small velocity ratio intersection problem caused by developing high-speed vehicle, a kinematics model of interceptor and target was established. The effect of coplanar impact angle on approaching velocity and allowed impact area was analyzed and the velocity ratio requirement of three-dimensional intersection was studied. Based on predicted initial target velocity and moving direction, the impact angle constraint was diverted into expected line-of-sight angle via quasi parallel approach. An improved guidance law with line-of-sight angle constraint was proposed via variable structure control. The results show that the proposed guidance law achieves to guiding the line-of-sight to converge to zero as well as reaching the expected impact angle; what's more, the robustness of guidance to evaluated error of target velocity is satisfied.