不同高度不同大气模式下红外图像仿真

Simulation of Infrared Images at Different Heights and Atmospheric Modes

本文以飞机平台的红外图像为数据源,研究了不同大气模式下成像高度对红外仿真图像的影响,推导了随热像仪成像高度变化的辐射亮度计算公式。分别采用MODTRAN和LOWTRAN两种大气辐射传输模型进行不同高度的红外图像大气修正,并对所得仿真数据进行了分析比较得出:在高度低于20km时,同种大气模式下两种模型仿真数据接近,误差不大,都很理想;在高于20km时,LOWTRAN模型仿真数据参考价值不大,MODTRAN模型结果更接近实际情况、更实用。

The atmosphere and imaging height directly affect the infrared image quality of thermal imagers.Using the infrared image of an aircraft platform as the data source,infrared simulation images at different heights and atmospheric modes were studied,and a simulation calculation formula for the height of the thermal imager was derived.By selecting different atmospheric modes,examining MODTRAN and LOWTRAN atmospheric radiation transmission models for infrared image atmospheric correction at different heights,and analyzing and comparing the obtained simulation data,it is concluded that when the distance is less than 20 km,the simulation data of the two models in the same atmospheric mode are close and that the error is small,which is ideal.When the distance was greater than 20 km,the reference value of the LOWTRAN model simulation data was small,and the results of the MODTRAN model were closer to the actual situation and therefore more practical.