含有突變信號的激光雷達能見度反演
[Abstract]:When there are clouds, fog, smoke or hard targets in the detection path, the atmospheric extinction coefficient will change significantly in the local area when the laser radar detects atmospheric visibility, which shows that the laser radar echo signal has a sudden change in the original attenuation trend. Under the influence of this, the direct use of the existing algorithms will result in low accuracy or false inversion of visibility. For this reason, a visibility inversion algorithm is proposed, which combines abrupt point location, extinction coefficient boundary value determination and extinction coefficient iterative inversion. Firstly, the location of the abrupt signal is located, then the abrupt point is eliminated and the boundary value of extinction coefficient is obtained by slope method. Finally, the atmospheric extinction coefficient and visibility are retrieved iteratively based on Fernald method. The simulation results of two typical atmospheric extinction models show that the algorithm can improve the accuracy of visibility inversion and obtain more accurate global visibility. The effectiveness of the algorithm is also verified by using the echo data measured by the lidar visibility meter developed by ourselves.
【作者單位】: 中國民航大學(xué)工程技術(shù)訓(xùn)練中心;中國民航大學(xué)民航氣象研究所;
【基金】:國家自然科學(xué)基金(U1433202,U1533113) 中央高校基本科研基金(3122016D007)
【分類號】:TN958.98
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