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Performance improvement of long-range scanning Mie lidar for the retrieval of atmospheric extinctionGao, F.; Veberič, D.; Stanič, S.; Bergant, K.; Hua, D.-X.
Journal of quantitative spectroscopy & radiative transfer, June 2013, 2013-6-00, 20130601, Letnik: 122Journal Article
To improve the detection range and signal to noise ratio in the remote sensing of atmospheric processes using long-range scanning Mie lidar, simultaneously obtained analog (A) and photon-counting (P) data traces were merged using a novel gluing method based on the modification of the A trace so that it follows Poisson statistics. In comparison with the traditional method based on the minimization of the distance between A and P, the advantage of this new approach is an improved uniformity of the merged data trace as well as a reduced influence of atmospheric conditions on the obtained transfer coefficients. The atmospheric extinction was subsequently retrieved using the two- and multi-angle method. The offset of the laser beam direction was calibrated against a self-leveling laser, as an offset in elevation angle was found to produce considerable error in the atmospheric extinction profiles obtained under the assumption of horizontal atmospheric homogeneity. ► Characteristics of analog and PC data trace were evaluated by variance calculation. ► PC data trace is Poissonian distributed, while analog data trace is linear shifted. ► Novel gluing method by modifying analog data to follow Poissonian was investigated. ► Lidar elevation angle was horizontally calibrated against a self-leveling laser. ► Small angular offset was found to have a visible impact on atmospheric extinction.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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