考慮多次散射影響的斜程能見度反演方法研究
[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.
【作者單位】: 中國民航大學(xué)天津市智能信號(hào)與圖像處理重點(diǎn)實(shí)驗(yàn)室;中國民航大學(xué)民航氣象研究所;中國民航大學(xué)工程技術(shù)訓(xùn)練中心;
【基金】:國家重點(diǎn)基礎(chǔ)研究發(fā)展“973”計(jì)劃(2010CB731801) 國家自然科學(xué)基金(60879016)資助項(xiàng)目
【分類號(hào)】:TN958.98
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