研究了地表反照率对天空偏振模式的影响。针对目前缺乏实际环境下不同时间、不同地点单一影响因素的定量测试研究,先运用libRadtran二次开发软件,仿真分析不同地表反照率下的天空偏振模式,然后利用图像式测试系统,分别在草地和沥青地表、海洋和沥青地表进行同步异地测试,定量分析地表反照率对偏振方位角和偏振度的影响。结果表明:地表反照率对偏振方位角分布基本没有影响,分布始终稳定;而地表反照率对偏振度数值有较大的衰减作用,在同一天内同一时刻下,地表反照率越大,最大偏振度值越小;地表反照率相差越大,最大偏振度值的平均减小量越多,最大偏振度值减小的幅度越大。

The effect of the surface albedo on the sky polarization mode is studied. At present, there is a lack of research on quantitative tests with a single influencing factor at different time and locations in the actual environment. In view of this, the re-developed libRadtran software is used to simulate and analyze the sky polarization mode at different surface albedos. Then, synchronous remote tests are conducted in group on meadow and asphalt surfaces, ocean and asphalt surfaces with the imaging test system and the influence of surface albedo on the polarization azimuth and polarization degree is analyzed quantitatively. The results show that the surface albedo has little effect on the polarization azimuth distribution, which is always stable. However, it has a strong attenuating effect on the polarization degree. At the same time on the same day, a greater surface albedo entails a smaller maximum polarization degree; a bigger difference of surface albedo means a sharper average decrease and a larger decreasing extent in maximum polarization degree.