考虑多次散射影响的斜程能见度反演方法研究

发布时间：2018-07-25 18:18

【摘要】：提出了一种在低能见度天气条件下考虑多次散射影响时激光雷达反演斜程能见度的组合算法。首先,根据Koschmieder定律构建能见度方程,确定斜程能见度与大气光学厚度的依赖关系;其次,根据多次散射激光雷达方程采用双仰角法反演大气光学厚度,并采用半解析Monte Carlo法计算多次散射对单次散射比值;最后,求出考虑多次散射影响时的斜程能见度。使用地基激光雷达垂直探测进行斜程分解的回波信号数据,进行了实验验证。结果表明,在能见度小于1km时,考虑与未考虑多次散射影响的斜程能见度相对误差达9%,并且随着能见度的降低,多次散射对单次散射比值逐渐增大,多次散射作用增强。因此,研究低能见度天气条件下,多次散射的影响是非常必要的。
[Abstract]:A combined algorithm for inversion of slant range visibility by lidar considering multiple scattering in low visibility weather is proposed. Firstly, the visibility equation is constructed according to Koschmieder's law, and the dependence of slant visibility on atmospheric optical thickness is determined. Secondly, the atmospheric optical thickness is retrieved by double elevation angle method according to the multiple scattering lidar equation. The semi-analytical Monte Carlo method is used to calculate the ratio of multiple scattering to single scattering. Finally, the oblique visibility considering the influence of multiple scattering is obtained. The echo signal data decomposed by slant range using vertical detection of ground-based lidar are verified by experiments. The results show that when the visibility is less than 1km, the relative error of oblique visibility considering and not considering the influence of multiple scattering is up to 9. With the decrease of visibility, the ratio of multiple scattering to single scattering increases gradually and the effect of multiple scattering increases. Therefore, it is necessary to study the effects of multiple scattering in low visibility weather.
【作者单位】：中国民航大学天津市智能信号与图像处理重点实验室;中国民航大学民航气象研究所;中国民航大学工程技术训练中心;
【基金】：国家重点基础研究发展“973”计划(2010CB731801) 国家自然科学基金(60879016)资助项目
【分类号】：TN958.98

【相似文献】