导引搜索下不对称现象的研究

Study of Dissymmetry Effect on Image Seeking Adopting Guided Search

对于图像制导导弹,采用导引搜索可提高目标的进场概率,但在某些情况下会引起监视器画面移动的不对称现象.找出了引起不对称现象的两个主要原因———视线旋转角速度和导弹的前置速度.在导引搜索条件下,通过仿真研究了攻击具有不同横向速度的目标时的不对称特性,采用不对称因子和等效搜索速度极值对不对称性进行了定量描述.仿真结果显示,在相同初始条件下,目标的横向速度越大,不对称现象越明显.研究结果对图像制导导弹的中制导律和搜索规律设计提供了一些设计依据.

For an image guided missile, adopting guided search can increase the probability of target entering the instantaneous field of view of the seeker, but it may cause dissymmetry of the monitor image under some conditions. It has been found that two factors can cause this dissymmetry, viz. the angular velocity of the line of sight and the lead speed of the missile. With the help of simulation, monitor image dissymmetry effect has been studied when the missile attacks moving targets of different speeds. A dissymmetry parameter and the extremum search speed are used to evaluate the dissymmetry. Simulation results show the dissymmetry is more serious when the speed of moving targets is larger under the same initial conditions. The study provides more basis to the design of midcause guidance law and seeker search pattern.