光电观瞄系统激光照射距离分析

On Laser Designation Distance of Electro-Optical Targeting System

激光照射距离是光电观瞄系统照射器和火控系统重要的设计输入。对于激光制导系统,利用能量传递关系可导出入瞳处的能量密度,进而分析影响光电观瞄系统激光照射距离的因素。通过目标反射因子和大气透过率经验公式的推导,建立了照射距离和激光能量、导引头灵敏度阈值、束散角、目标大小等影响因素的函数关系。借助Matlab编程,实现照射距离的快速求解。计算结果表明,照射距离随着激光能量提高而增大,达到一定距离后,增速明显放缓。对于面目标,目标靶面法线平行于弹目连线时,照射距离最大。此外,任务高度、目标大小、导引头灵敏度阈值和气象参数等也是影响照射距离的关键因素。

Laser designation distance of electro-optical targeting system is an important design input of the laser designator and the fire control system.By using the energy transfer sequence of laser-guided system,we obtained the energy density at the entrance pupil of the seeker,and analyzed the factors that have effects on the designation distance.The empirical equations of target reflectance factor and atmospheric transmittance were deduced,and the functional relationship between the designation distance and such factors as laser energy,seeker sensitivity threshold,the divergence angle and the size of target,etc.Then the designation distance was obtained with the aid of Matlab.The calculation result showed that:1)The designation distance increases with the laser energy,and the slope decreases obviously when it achieves a certain distance;2)For a surface target,the maximum designation distance is reached when the target normal is parallel to target-seeker direction;and 3)There are some other important factors that have effects on the designation distance,including the attack height,the target size,the seeker sensitivity threshold,the atmospheric parameters,and so on.