多导弹攻击时间与攻击角度两阶段制导

提出了一种新的多导弹攻击时间与攻击角度制导,其制导过程分为精确时间及粗略角度控制阶段和精确角度控制阶段。第一阶段:先将攻击时间控制问题转化为攻击距离跟踪问题,并将导弹导引模型转换为以弹目距离为输出的二阶非线性模型;然后估计各枚导弹到达时间,并据此指定攻击时间,再由指定攻击时间来设计期望的弹目距离;最后对此攻击距离跟踪系统采用时标分离的方法设计慢子系统和快子系统,针对这两个子系统分别进行动态逆设计,同时考虑对攻击角度进行粗略控制。第二阶段:在第一阶段控制的基础上,进一步采用变结构制导律,实现对攻击角度精确控制。另外,本文给出了一种考虑攻击角度的攻击时间确定方法。仿真结果验证了本文给出方法的有效性。

Two stages guidance to control impact time and impact angle for multi-missiles

A new cooperative guidance to control impact time and impact angle for multi-missiles is proposed. The guidance consists of two stages: the first stage is to control the time accurately and to control the angle approximately, and the second stage is to control the angle accurately. In the first stage, the impact time control problem is transformed into a range tracking problem, and the equations of the relationship between missile and target are transformed into a second-order nonlinear model; then the time-to-go of each missile is estimated, based on which the desired impact time is determined; finally, the time-scale separation method is used to design the desired low speed subsystem and fast speed subsystem. Nonlinear dynamic inversion controllers are designed for the two subsystems respectively, and in the above design an approximate control to the impact angle is considered. In the second phase, the variable structure guidance law is applied to control the impact angle accurately. In addition, a new approach to determine the impact time is also proposed that considers the impact angle constraints. Simulation results validate the proposed approach.