近海面异常折射对光电探测目标特征的影响分析

Refraction Effects on Electro-Optical Target Characteristic in Near Sea Surface

由于可见光和红外等光电设备对近海面(50m范围内)的低空目标如海上舰船、掠海导弹和低空飞机进行跟踪探测时,受到大气折射效应影响显著,可导致探测距离的增大或者缩短,尤其是出现的蜃影现象,将增加系统的虚警概率,干扰对目标的跟踪。基于近海面海气通量算法与射线跟踪算法建立海上光电传输特征评估模型,并利用2009年11～12月在北黄海某海域开展的海上光电探测实验数据,实时评估了特征折射高度,最大探测距离等关键参数,仿真模拟了海上多目标图像,验证了模型的性能。结果表明,基于实时海洋气象环境信息,模型评估最大探测距离准确率较高,并且可以较准确地模拟不同距离上的目标图像。

When detecting and tracking the low-sky targets（lower than 50 m） such as boats,sea-skimming missile and airplane,visible and infrared electronic optical（EO） systems could be highly affected by atmospheric refraction.The distance from the apparent horizon to an observer can be lengthened or shortened,especially mirage will increase the false alarm odds and the disturbance of detecting and tracking of targets.This paper established optical propagation evaluation model based on air-sea flux algorithm and ray tracing program.Using EO detection trial data in the Northern Yellow Sea,from November to December,2009,evaluated characteristic refractive heights,the maximum inter-visvion ranges（MIVR） as well as some relevant EO propagation parameters,simulated the marine multi-objective image,and has verified the model performance.The model accuracy of MIVR is better,the target image on different distance is simulated accurately.