多角度偏振反射与二向性反射定量关系初探

在反射、散射和透射电磁辐射的过程中,地表或大气中的目标地物将产生与它们自身性质有关的偏振特性.因此,地物的偏振信息探测成为遥感目标识别的新手段.偏振反射是伴随着目标的二向性反射而产生的,在探测目标地物的二向性反射的同时,可以通过偏振器获得目标地物偏振态的三维空间分布.本文从多角度偏振遥感机理的角度出发,研究了偏振化二向性反射与二向性反射之间存在的定量关系,并从实验上验证了二向反射、45°偏振、偏振均值三者在2π空间的相应方位角、天顶角、探测角以及通道上的反射比均相等.

STUDY ON QUANTITATIVE RELATION BETWEEN MULTI-ANGLE POLARIZED REFLECTANCE AND BIDIRECTIONAL REFLECTANCE

In the process of reflecting,scattering and transmiting electromagnetic wave,earth targets can produce polarized characteristics which related to the nature themselves,therefore,detecting the objects' polarization information becomes a new method in remote sensing.Since polarized reflectance always goes with bidirectional reflectance,the polarized three-dimensional spatial distribution of the targets can be obtained by a polarimeter during detecting its bidirectional reflectance.From the point of view of multi-angle polarized remote sensing mechanism,the quantitative relation between polarized BRDF and BRDF was studied.And the experiment testified the equality of the reflectance of bidirectional reflect,polarized reflect of 45 degree and polarized reflect of mean value in the corresponding azimuth angle,zenith angle,and detection angle and detection channels in 2π space.