Scattering Characteristics of Complex Target from Solar Irradiance and Sky-Ground Background Radiance in Infrared Spectrum

摘要

Scattering characteristic of complex target from the solar irradiance and sky-ground background radiance plays an important role in both theoretical researches and practical engineering. The solar irradiance and sky-ground background radiance and scattering property are discussed in this paper. BRDF (Bidirectional Reflectance Distributional Function) relates incident irradiance with scattering radiance while LRCS (Laser Radar Cross Section) shows the scattering characteristic of complex target. By using KA (Kirchhoff Approximation) method, we calculate the LCRS of facet of target and then get BRDF of each facet. Then all the visible faces are added up. Due to the complexity of the atmosphere model, MODTRAN is used to calculate the solar irradiance and background radiance. Finally, to give an example, a model airplane is taken for instance. The results indicate the effectiveness of the method we proposed.