The relatively rational parameters of grating are chosen according to the calculated results to make that when incidence通过计算结果，找出相对合理的光栅参数，使得当入射光的入射角或方位角发生变化时，光栅反射出不同波段的光，即反射出不同颜色的光。
A Study of the Relation between σ°and Incidence Angle by Modeling Backscattering from Wheat and Rice小麦水稻后向电磁散射建模研究σ°与入射角的关系