一、问题的提出用导弹拦截运动目标时,理想的弹道是导弹速度超前于视线一个适当的角度,使导弹沿直线轨迹飞行去碰撞速度不变的空中目标。这种理想碰撞航线的二维终端对策的几何关系表示在图1中。如果精确地建立了这种初始几何关系,导弹和目标速度保持不变,并且目标不作机动,在标准追踪三角形ABC中,目标和导弹将在B点发生碰撞,导弹受自动驾驶仪控制,而自动驾驶仪接收从导弹系统来 I. PROBLEM PROBLEMS When intercepting a moving target with a missile, the ideal trajectory is that the missile speed is ahead of the line of sight at an appropriate angle, so that the missile flies along a straight trajectory to collide with an invariable airborne target. The geometrical relationship of this two-dimensional terminal strategy of the ideal collision route is shown in FIG. 1. If this initial geometry is established accurately, the missiles and target velocities remain unchanged and the target is unmoved. In the standard tracking triangle ABC, the target and missile will collide at point B, the missile is controlled by the autopilot, and the automatic The pilot receives from the missile system