针对红外导引头3D视景仿真中实时生成天空图像的应用需求,提出了一种天空红外图像的实时生成方法,具有一定的工程应用价值。首先使用MODTRAN分析并提出了红外仿真中影响天空红外辐射计算的关键因素。基于这些关键因素计算不同天顶角的天空辐亮度。采用辐亮度插值和图像列向量扩展的方法生成天空红外图像纹理。通过构建天空辐射轮廓线数据库在仿真系统中实现了红外天空图像的动态更新。实验表明,文中方法实时性强,仿真结果可信。

For meeting the demand of generating IR sky image in real-time in 3D scene simulation of IR seeker, a method of generating IR sky image was proposed in this paper. Firstly, the key factors that affect sky radiation in IR simulation was analyzed by MODTRAN and IR radiation with different zeniths was calculated according to these factors. The IR sky image was created by method of interpolation to radiance of different zenith and expanding the column vector of IR image. The database of sky radiation profile was constructed to dynamically update sky image in simulation system. According to experiments, instantaneity of the method in this paper is good, and the result of simulation is credible.