目标对复杂背景辐射的光散射

The light scattering of complex background radiation incident to target

利用电磁辐射和散射理论 ,讨论了目标表面双向反射分布函数 .利用Lowtran7大气传输模型计算大气背景辐射 ,通过双向反射分布函数将背景入射光照度和目标散射亮度结合起来 ,推导了粗糙面对复杂背景辐射光散射强度空间分布表达式 ,讨论了散射的相干和非相干分量 ,完成了目标对阳光、大气背景辐射的光散射的光谱分布和空间强度分布的计算 ,对于粗糙朗伯面将公式进行了简化 .

According to electromagnetic radiant and scattering theories, the Bidirectional Reflectance Distribution Function (BRDF) of a target is discussed. The Lowtran7 model is used to calculate the atmospheric background radiation. The incident light irradiance and scattering radiance of a target are linked by BRDF. The equation is deduced to compute the scattering light spacial distribution. The coherent and incoherent quantities are discussed. The scattering spacial intensity and spectral distribution of the background radiation incident to a targe are calculated. For Lambertian surface, the equation is simplified.