天空背景红外图像仿真

The simulation of Sky Background IR image

为了使天空背景辐射强度光谱分布最终生成红外探测器焦平面上背景辐射功率分布图像,需要对天空背景辐射各影响因素进行分析,建立准确的背景辐射到探测器光学系统焦平面的辐射能量传输模型。本文利用MODTRAN软件计算不同天候条件下的天空背景辐射强度光谱分布,建立了背景辐射到探测器光学系统焦平面的辐射能量传输模型,给出了天空背景在焦平面上的辐射功率计算方法,利用天空背景辐射功率分布生成其红外图像。最后编写了仿真软件,生成不同天候天空背景图像,并与红外热像仪拍摄的天空背景图像进行了比对,其变化趋势有较高的一致性。

In order to make the sky background radiation spectrum distribution generate the infrared detector focal plane power distribution image,it needs to analyze the factors of the sky background radiation and establishe an accurate energy transfer model of the background radiation to the detector optical system focal plane of the radiation energy.In this paper,it calculates the sky background radiation spectral distribution under the different weather conditions by MODTRAN software,and establishes an energy transfer model of the background radiation to the detector optical system focal plane of the radiation energy,and gives out of the calculation method of the focal plane of the sky background radiation power,using the sky background radiation power distribution to generate their infrared images.Finally,we compile the simulation software to generate images of different weather and sky background.And compared with sky background image which IR imaging instrument take,the trends have a higher consistency.