基于遥感反演的地球红外背景建模

Modeling of global infrared background based on remote sensing inversion

模拟地球红外辐射背景的前提是要获取可靠的全球表面温度。利用卫星遥感数据可以反演得到较精确的地表温度。反演算法采用了应用广泛的分裂窗算法,并将反演结果绘制成了全球表面温度分布图。同时,建立了完整的地球红外辐射亮度模型,考虑不同地域、纬度和季节模式下的大气辐射亮度和大气衰减。通过遥感反演技术与红外辐射建模技术的结合,最终完成了任意波段全球红外辐射背景亮度的计算与图像生成。结果表明:模拟的地球红外辐射图像效果精细,真实反映了地球背景的红外辐射特征,在空间目标的热环境分析,以及空间红外探测与隐身技术的研究等方面具有重要的应用价值。

The precondition for modeling the earth′s infrared background is to derive reliable global surface temperature. The accurate surface temperature could be retrieved based on the data of remote sensing. Choosing the widely used split-window algorithm, the global distribution of the surface temperature was retrieved. Besides, the model of the earth infrared radiance was completely proposed, considering the atmospheric infrared radiance and the atmospheric transmittance in different modes of region, latitude and season. Through a combination of remote sensing technology and infrared radiation modeling technology, the global infrared background radiance was finally calculated and mapped in any band. It can be indicated that, the simulated images are detailed and accurate, and reflected the real infrared characteristics of the earth background. The results have an important application value in thermal environment analysis of space objects, research of space infrared detection and stealth technology.