无云地球大气背景辐射光谱亮度的计算模型

根据辐射的叠加性，提出了一种用于卫星遥感无云地球大气背景辐射强度计算的理论模型。在利用该模型对晴朗无云地球大气背景的光谱辐射亮度进行计算时，使用迭代法解辐射传输方程并对大气采用动态分层。模型计算的结果与法国6S软件计算结果的对比表明：该模型以及计算方法对于无云地球大气背景向上的辐射亮度计算是精确可行的。且计算结果说明在可见光波段地球大气背景的辐射是很强的，而在红外强吸收波段，地-气系统的辐射很弱，主要来自大气的后向散射。

Computation model of spectral radiation luminance of clear atmosphere background

A theoretic model is proposed based on the characteristics of radiation superposition for calculating the radiative intensity of clear atmosphere background. The model was used to calculate the spectral radiation luminance of the clear atmosphere background, and an iterative method was used to resolve the radiative transfer equation and perform the dynamic stratification of the atmosphere. The comparison between the results of the model computation and the well-known 6S software computation shows that this model and calculating method are accurate for the computation of the spectral irradiation luminance in the clear atmosphere background. And the results show that the spectral luminance of the clear atmosphere is high at short wavelength and weak at the strong absorption IR band.