高空远距离目标红外辐射及大气衰减模型研究

Study of Infrared Radiation of Distant High-altitude Targets and Atmospheric Attenuation Model

结合普朗克辐射定律，采用双波段测温法分析了高空远距离目标的温度与红外辐射。提出了一种目标投影面积的计算方法。由于是远距离探测，在考虑地球曲率的情况下提出了一种计算任意方向两点大气衰减的计算模型，并分析了不同探测距离下3～5μm和8～12μm两个波段红外辐射的衰减情况。实验结果表明，在10km左右的高空中，目标红外辐射测量的距离可以从低空的几十公里增加到几百公里，这为进一步分析目标辐射特性提供了理论与技术上的支撑。

In combination with Plank＇s radiation law, a dual-band temperature measurement method is used to analyze the temperature and infrared radiation of a distant high-altitude target. A method for calculating the projected area of the target is proposed. Because the target is detected at a long distance, a model for calculating the atmospheric attenuation in arbitrary direction of two sides taking the curvature of the earth into account is presented. It is used to analyze the attenuation of infrared radiation in both 3 to 5 μm and 8 to 12μm bands at different distances. The experimental result shows that in the high altitude about 10 km away, the measuring distance of the infrared radiation from the target can be increased from a few tens of kilometers in low altitude to hundreds of kilometers. This provides a theoretical and technical support for the further analysis of the radiation characteristics of targets.