基于电矢量描述的大气偏振建模

Modeling of Skylight Polarization Pattern Based on Electric Vector

现有理想情况下大气偏振建模回避了对散射过程的描述,无法扩展到实际模型.本文采用电场强度矢量描述光波,建立天球坐标系与东北天坐标系研究光的多点单次散射过程.利用两坐标系之间的转换关系计算参数,将单次瑞利散射分析方法应用于全天域.计算散射光电场强度矢量并处理,得到偏振度和偏振方向矢量来表征大气偏振信息.仿真实验表明该方法能够准确描述理想情况下大气偏振模式,且所得电矢量可以作为实际建模的参考数据,方法具有一定的扩展性和应用价值.

Traditional ideal model of skylight polarization pattern can＇t be extended to actual situations without analysis of scattering process.In this paper,electric field intensity vector is used to describe light waves.Then the celestial coordinate system and the north-east-up coordinate system are established respectively to analyze the scattering process.Utilizing the transformational relation of the two coordinate systems,the analytical method of Rayleigh scattering can be applied to every measured point over the celestial hemisphere.Degree of polarization and polarization direction vector are used to express skylight polarization information which can be calculated by electric vector of scattered light.Simulation results show that the new modeling method has certain expansibility and applicability because it can not only provide an accurate description of ideal skylight polarization pattern,but also offer the reference data for actual models.