光学学报, 2020, 40 (14): 1401001, 网络出版: 2020-07-23   

斜程能见度计算中的天空背景辐射亮度仿真与分析 下载: 1134次

Simulation and Analysis of Sky Background Radiance in Slant Visibility Calculation
作者单位
1 西安理工大学激光雷达遥感研究中心, 陕西 西安 710048
2 中国科学院安徽光学精密机械研究所, 安徽 合肥 230031
摘要
从斜程能见度探测原理出发,利用SBDART(Santa Barbara DISORT Atmospheric Radiative Transfer)模式求解辐射传输方程,对天空背景辐射进行了详细的理论仿真与分析。利用SBDART 模式自带的气溶胶模型,仿真得到了不同类型气溶胶模型在晴天条件下的天空背景辐射结果,探讨了太阳直接辐射和大气散射辐射以及不同高度上大气散射辐射的分布趋势,分析了气溶胶单次散射反照率和不对称因子对结果的影响。提出了激光雷达结合SBDART模式的实际天空背景辐射的计算方法,以实测扫描激光雷达的气溶胶探测数据作为SBDART模式的输入参数,计算获得了实际大气中太阳直接辐射以及不同高度处天空背景辐射的分布结果。为了验证结果的正确性,利用太阳光度计同步测量的太阳直接辐射,进行了对比验证,两者具有较好的一致性,相关系数达到0.99。以黑体为目标,初步探讨了天空背景辐射对斜程能见度的影响,结合激光雷达和SBDART模式所得到的实际天空背景辐射可为斜程能见度精确反演提供保证。
Abstract
In this paper, based on the principle of slant visibility detection, the SBDART (Santa Barbara DISORT Atmospheric Radiative Transfer) model is used to solve the radiation transfer equation, and detailed theoretical simulation and analysis of the sky background radiation are carried out. First, using the aerosol models from SBDART model, the sky background radiation results of different types of aerosol models under sunny conditions are obtained. The distribution trends of solar direct radiation and atmospheric scattering radiation at different heights are discussed. The influences of single scattering radiation albedo and asymmetry factor on the results are analyzed. A calculation method combined with Lidar and SBDART model is presented to obtain the real sky background radiation. The aerosol data obtained by a scanning lidar is taken as the input parameter of SBDART model, and the distribution results of solar direct radiation in the real atmosphere and sky background radiation at different heights are calculated. In order to validate the correctness of the results, the solar direct radiation synchronously measured by the solar photometer is compared and verified. The results show that a consistent change trend can be obtained between them, showing positive correlation with a correlation coefficient of 0.99. Finally, taking blackbody as the target, the influence of sky background radiation on slant visibility is preliminarily discussed. The actual sky background radiation obtained by combining Lidar and SBDART models can provide guarantee for accurate inversion of slant visibility.

陆川, 刘文清, 王玉峰, 贾立松, 高天乐, 李兴兴, 李仕春, 狄慧鸽, 刘晶晶, 宋跃辉, 华灯鑫. 斜程能见度计算中的天空背景辐射亮度仿真与分析[J]. 光学学报, 2020, 40(14): 1401001. Chuan Lu, Wenqing Liu, Yufeng Wang, Lisong Jia, Tianle Gao, Xingxing Li, Shichun Li, huige Di, Jingjing Liu, Yuehui Song, Dengxin Hua. Simulation and Analysis of Sky Background Radiance in Slant Visibility Calculation[J]. Acta Optica Sinica, 2020, 40(14): 1401001.

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