大气-海雾多层环境下的天空偏振模式

doi:10.12382/bgxb.2021.0143

摘要/Abstract

摘要： 为研究复杂海洋环境下天空偏振模式分布情况，针对大气-海雾复杂海洋环境，研究垂直方向上大气-海雾多层介质的天空偏振分布模式。利用简化的大气、海雾双层结构模拟复杂海洋情况，分别采用Rayleigh及Mie散射方法求得大气、海雾均匀介质层的散射系数，采用基于矢量辐射传输方程的倍加累加方法计算两层介质间的辐射传输，得到全天空偏振分布情况，以太阳子午线上海雾层下行辐射为重点研究地面观测到的偏振特性变化趋势。研究结果表明：在太阳位置处可得到偏振度（DOP）的最小值，在太阳高度角与观测高度角夹角为90°时可得到DOP最大值；随着能见度下降，DOP逐渐增加，且观测高度角大于90°时DOP增大效果明显；对于可见光典型波长，当波长增大时DOP逐渐减小，且随着能见度的减小，波长对偏振特性的影响越来越小。

关键词: 大气-海雾多层环境, 天空偏振模式, 倍加累加方法, 下行辐射

Abstract: The polarization distribution pattern of skylight in the atmosphere and sea fog multilayer medium in the vertical direction is researched.The simplified double layer structure of atmosphere and sea fog is applied to modulate the complicated marine environment，and the scattering coefficients of atmosphere and sea fog uniform medium are calculated with Rayleigh and Mie scattering methods，respectively.The transmission of radiation between the two layers of medium is computed to get the polarization distribution conditions of skylight by using the adding-doubling method（RT3） based on vector radiation transmission equation，and the variation tendency of the polarization characteristics observed from the ground is studied for the downwelling radiation of sea fog on the meridian of the sun.The results show that the minimum degree of polarization (DOP) can be obtained on the position of the sun. And when the angle between the solar altitude angle and the observed altitude angle is 90°，the maximum DOP can be obtained. With the decrease in the visibility，DOP gradually increases. When the observing altitude angle is larger than 90°，the increasing effect of DOP is obvious. For the typically visible wavelengths，DOP gradually reduces when the wavelength increases. The wavelength has less effect on the DOP with the smaller visibility.The research gives the theoretical guidance for polarization detection in the vertical sea fog environment with different visible wavelengths and different visibilities.

Key words: atmosphereandseafogmulti-layerenvironment, skylightpolarizationpattern, adding-doublingmethod, downwellingradiation

中图分类号:

O436.2

刘阳，付强，张肃，战俊彤，史浩东，李英超，刘艺，娄岩，余益欣. 大气-海雾多层环境下的天空偏振模式[J]. 兵工学报, 2022, 43(5): 1201-1207.

LIU Yang， FU Qiang， ZHANG Su， ZHAN Juntong， SHI Haodong， LI Yingchao， LIU Yi， LOU Yan， YU Yixin. Polarization Pattern of Skylight in Multi-layer Environment of Atmosphere and Sea Fog[J]. Acta Armamentarii, 2022, 43(5): 1201-1207.

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