高斯激光对红外成像制导系统的干扰效果分析

Analysis of Gaussian Laser Jamming Effect on the Infrared Imaging Guidance System

考虑激光器系统像差、大气湍流、跟踪测量设备的跟瞄误差以及激光光轴的抖动误差等诸因素的影响,以激光辐照在红外成像制导系统探测器光敏面的功率(能量)密度参数作为衡量高斯激光干扰效果的评价指标,结合探测器自身致眩阈值,提出了一套高斯激光最大干扰距离的估算方法。以高功率脉冲CO2激光干扰导弹红外导引头为例,计算了不同激光发射功率下的最大干扰距离。结果表明,激光最大干扰距离随着脉冲激光峰值发射功率的增大而增大,这种变化趋势随激光峰值功率的增大而趋于平缓,而且激光正入射的干扰效果要优于斜入射情况。

Considering the influence of the aberration of laser system, the atmospheric turbulence, the pointing error of the tracking equipment and the jitter error of the laser axis, the parameter of the power density on the target is used to evaluate the high power laser jamming effect on the infrared imaging guidance system. Combined with the dazzle threshold of the detector, the method for estimating operating range of high power laser system is proposed. The infrared seeker of missile under high power CO2 laser irradiation is taken as example, and the relationship between operating range and laser transmitting power are calculated. The results show that the operating range increases along with the increasing of laser transmitting power, and its curvilinear tread becomes slower as the laser power reaches higher. Besides, the jamming effect of normal incidence of the laser is better than the non-normal incidence.