激光雷达雨中能见度测量
Measurement of visibility using lidar in rain
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摘要: 分析了雨中能见度测量值偏高是由于雨滴的前向散射效应的原因。针对这一情况，在假设雨滴谱分布满足Marshall-Palmer分布条件下，提出了激光雷达前向散射修正模型。利用自行研制的CSY2型能见度激光雷达在孝感、北京进行了为期半年的比对实验。结果显示：在中雨和大雨条件下，利用该修正算法能大大减少能见度测量误差。Abstract: A half-year contradistinctive experiment for visibility detecting has been performed using CSY2 visibility lidar developed by ourselves in Xiaogan of Hubei province and Peking. The output of CSY2 visibility lidar was lower than the outputs of eyeballing and MITRAS meter due to forward scattering caused by raindrop. Based on Marshall-Palmer particle spectral distribution function, the forward scattering effect on 1 064 μm laser propagation of raindrop was analyzed, and a new modified formula for visibility, was proposed, with which measurement error of visibility can be largely reduced in moderate and heavy rain．
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Key words:
- lidar /
- visibility /
- rain attenuation /
- scattering correction
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