大气中目标背景对比度及其影响因素的数值分析
Analysis on the object-background contrastby numerical radiative transfer computation
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摘要: 从辐射传输理论出发，利用离散纵标法软件包（DISORT），计算了典型大气条件下0.55μm波长的目标背景对比度，分析了观察者的天顶角和方位角、水平能见度、垂直高度、太阳的天顶角和方位角以及气溶胶单次散射反照率对目标背景对比度的影响。结果表明：目标背景对比度随着观察者天顶角余弦的增加而增加；随着太阳天顶角余弦的增加而减小；随着观察者和太阳方位角差的增加而增加；随着高度的增加而减小；随着水平能见度的增加而增加；随着单次散射反照率的增加而减小。Abstract: In this paper, a software-package, DISORT (discrete ordinate method), is used to compute the object-background contrast at 0.55μm wavelength under the standard atmosphere. It is also analyzed that object-background contrast is affected by many factors, including the horizontal visibility, altitude, the visual zenith angle, and solar zenith angle, azimuthal angles difference between the observer and the sun, and the aerosol single scattering albedo. As the result, the contrast increases with the increase of the observer zenith angle, with the decrease of the solar zenith angle, with the increase of the azimuthal angles difference, with the decrease of the altitude, and with the decrease of the single scattering albedo.
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