摘要
为研究可见光探测器对某型隐身飞机探测能力,首先建立可见光波段云-海-大气耦合的多向吸收-散射模型;再通过对飞机蒙皮和尾焰几何截面在不同太阳入射角和卫星观测角度下的反射特性建模分析,计算到达探测器焦平面的目标以及背景的光谱能量分布,从而得到在给定光照条件下探测器极限信噪比和极限探测距离.最后模拟的仿真成像结果验证了分析模型的正确性和结论的可信度.分析结果表明,以云-海为地物观测背景时,云层的上行反射特性对飞机可探测性的影响最为显著;当太阳入射角小于60°时,飞机蒙皮的表面双向反射率(BRDF)明显高于海平面;太阳入射角大于60°时,云层和海平面对阳光的反射占据主导地位.
In order to study the detection capability of visible light detector to a certain stealth aircraft,firstly,a multidirectional absorption-scattering model for coupled cloud-sea-atmosphere background in visible light band is established.Then,by modeling and analyzing the reflection characteristics of the geometric cross section of the aircraft skin and tail flame under different solar incidence angles and satellite observation angles,the spectral energy distribution of the target and the background reaching the focal plane of the detector are calculated,so as to get the minimum signal to noise ratio for image recognition and maximum detection range in the given lighting conditions.Finally,the simulated imaging results verify the correctness of the analysis model and the reliability of the conclusion.The analysis results are shown as follows:When the cloud and sea are taken as the background of ground object observation,the upward reflection characteristics of clouds have the most significant influence on the detectability of aircraft;when the solar incidence angle is less than 60°,the surface bidirectional reflectance distribution function(BRDF)of the aircraft skin is obviously higher than that of the sea surface;when the solar incidence angle exceeds 60°,the reflection of sunlight by clouds and sea surface dominates.
作者
田浩
蔡盛
王旌尧
王久龙
TIAN Hao;CAI Sheng;WANG Jingyao;WANG Jiulong(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China)
出处
《空天预警研究学报》
CSCD
2024年第1期6-10,共5页
JOURNAL OF AIR & SPACE EARLY WARNING RESEARCH
作者简介
田浩(1985-),男,副研究员,主要从事天基光电探测预警以及光电对抗技术研究;通信作者:王久龙(1990-),男,副研究员,从事光学载荷总体论证、建模与仿真等研究.E-mail:wangjiulong@ciomp.ac.cn。
