复杂环境背景下典型飞行器表面红外反射特性研究

飞机蒙皮对于背景辐射的反射可以作为红外目标识别的辐射源,但背景辐射通常来源于太阳辐射和地面背景辐射等辐射的综合作用,其复杂性和多变性也可能使飞机的红外反射辐射严重干扰红外制导的准确性,因此,研究复杂环境背景下的飞机蒙皮红外反射特性对于红外目标识别和红外导弹制导等应用具有重要意义。本文基于Schlick双向反射分布函数(BRDF)模型,结合有限元方法,利用反向蒙特卡洛法计算辐射遮挡因子,在MODTRAN软件环境下计算大气光谱透过率,针对不同条件下的飞机红外反射辐射特性进行研究。结果表明,不同探测角度和探测波段对飞机红外反射特性具有很大影响,且飞机蒙皮的反射辐射具有分布非均一性特点。

Research on infrared reflection characteristics of typical aircraft surface in complex environment

The reflection of aircraft skin to background radiation can be used as the radiation source of infrared target recognition,but the background radiation usually comes from the combined effect of solar radiation and ground background radiation,and its complexity and variability may also make the infrared reflection radiation of aircraft seriously interfere with the accuracy of infrared guidance.Therefore,it is of great significance for infrared target recognition and infrared missile guidance to study the infrared reflection characteristics of aircraft skin in complex environment.In this paper,based on the Schlick bidirectional reflectance distribution function(BRDF)model,combined with the finite element method,the radiation shielding factor is calculated by the reverse Monte Carlo method,the atmospheric spectral transmittance is calculated in the MODTRAN software environment,and the infrared reflectance and radiation characteristics of aircraft under different conditions are studied.The results show that different detection angle and detection band have great influence on the infrared reflection characteristics of the aircraft,and the reflection radiation of the aircraft skin has the characteristics of non-uniform distribution.