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中文摘要：
研究了非朗伯面目标对复杂背景（太阳和海天背景）红外辐射的散射特性。基于双向反射分布函数（BRDF）,通过坐标变换、对面元求和以及对波长积分等操作导出了非朗伯面目标散射亮度的空间分布式。利用海天背景的光谱亮度和太阳光谱照度（由大气传输软件Modtran计算）,以及目标表面的光谱BRDF,以圆柱体为例,分别对3-5μm和8-12μm波段、朗伯面和非朗伯面、水平和竖直姿态下目标的散射亮度空间分布进行了数值仿真。结果表明：在8-12μm波段,目标对太阳辐射的散射亮度可以忽略,并且目标对海天背景辐射的散射亮度比3-5μm波段时大;目标水平姿态时的散射亮度更大且各个方向上差异不大,因此,在8-12μm波段下目标处于水平姿态时更适于探测。
英文摘要：
The scattering characteristics of complex background（the solar,the sea and the sky background） infrared radiation from a non-lambertian target were studied.Based on bidirectional reflection distribution function（BRDF）,spatial distributed formula of scattering radiance from a non-lambertian target was derived by coordinate transformation,summation of the facets,integration to wavelength.With the solar spectrum irradiance and the sea the sky background′ s spectrum radiance calculated by Modtran model,and spectrum BRDF of the target surface,taking the circular cylinder as an example,spatial distribution of targets′ scattering radiance were simulated numerically,for waveband 3-5 μm and 8-12 μm which included lambertian and non-lambertian surface wth horizontal and vertical attitudes respectively.The results show that in waveband 8-12 μm,scattering radiance of the solar radiation from the target can be negligible,and scattering radiances of the sea the sky background radiation from the target are greater than those in waveband 3-5 μm;scattering radiance of the sea the sky background radiation from the horizontal target have weak directionality and are greater than those from the vertical target,so in waveband 8-12 μm horizontal target is more suitable for detection.
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