地球大气临边背景红外辐射特性研究

Research on Earth′s Atmosphere Limb Background Infrared Radiation Characteristics

飞行器所在环境的红外辐射特性对其红外特征存在着重要影响,因此对飞行器背景进行红外辐射研究很有必要。对地球大气系统进行观测时,视场中仅由大气区域构成的地气系统范围称为临边背景。基于中光谱分辨率大气辐射传输模式利用大气辐射传输理论建立了临边红外辐射计算模型,针对3~5μm和8~14μm典型波段,计算了各纬度冬夏两季的临边背景红外辐射,获得了影响临边背景红外辐射的主要因素,即切线高度、纬度、季节、气溶胶和波段并对其进行分析,为地球临边背景红外辐射探测提供了理论支持。

The infrared radiation characteristics of the environment for spacecraft play a significant role in the infrared characteristics of the spacecraft. Thus the study on infrared radiation of aircraft background is essential.The regime which only consists of the regional atmospheric climate system in the field is called limb background in the view of the atmosphere system of the earth. Based on moderate spectral resolution atmospheric radiation transmittance algorithm（MODTRAN） atmospheric radiation model, the atmospheric radiation transmission theory is used to establish the limb infrared radiation model. Limb background infrared radiations are calculated at all latitudes in the typical wavelength ranges of 3~5 μm and 8~14 μm, including the seasons of winter and summer.The results show that the main factors affecting the limb background infrared radiation are tangent altitude, latitude,season, aerosol and wavelength range. These provide theoretical supports for the detection of limb background infrared radiation.