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在对空红外系统的多光谱探测和红外仿真中,云的干扰不可忽略,所以,对云的辐射特性的研究至关重要。在不同的波段,云的辐射特性会有很大的差异,为了研究各个不同波段云的表观辐射特性,需要计算云的光谱辐射量。在典型观测模式下建立了低云的表观光谱辐射模型,研究了对云背景辐射有贡献的各个辐射分量的计算方法。基于传统的二流近似模型获取各个参数,引入云的光谱光学厚度的经验公式,进而获得了低云在中短波段的光谱辐射特性,有效地计算出了云背景在1～5μm的中短波段内的表观光谱辐亮度数据,并且节省了计算时间。经过比较发现,该模型的计算结果与实测结果有较好的一致性,可以为云背景多光谱分析、探测及仿真提供背景数据。
In the multispectral detection and infrared simulation of the airborne infrared system, the interference of the cloud can not be ignored, so the study on the radiation characteristics of the cloud is very important. In different bands, the radiation characteristics of the cloud will be greatly different. In order to study the apparent radiation characteristics of different cloud bands, the spectral radiation of the cloud needs to be calculated. In the typical observation mode, a low-cloud model of apparent spectral radiation was established and the calculation methods of various radiation components contributing to the cloud background radiation were studied. Based on the traditional second-flow approximation model, each parameter is obtained and the empirical formula of the spectral optical thickness of the cloud is introduced to obtain the spectral radiation characteristics of the low-cloud in the mid-short wavelength band. The cloud background is effectively calculated in the medium-short wavelength band Of the apparent spectral radiance data, and save the calculation time. After comparison, the calculated results of the model are in good agreement with the measured results, which can provide background data for multi-spectral analysis, detection and simulation of cloud background.