Cluster Analysis Techniques to Separate Air Motion and Hydrometeors in Vertical Incident Profiler Observations
Cluster Analysis Techniques to Separate Air Motion and Hydrometeors in Vertical Incident Profiler Observations
复制标题
垂直事件剖面观测中分离空气运动和水凝物的聚类分析技术
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
K. Gage
中科院分区：
文献类型：
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作者：
C. Williams;W. Ecklund;P. E. Johnston;K. Gage
摘要UHF波段的剖面仪对射电折射率结构的布拉格散射和小点目标的瑞利散射都很敏感。散射过程的识别对于正确解释这些观测结果至关重要，特别是从垂直入射光束收集的数据。本研究评估多普勒速度阈值的性能，作为一种手段，从垂直入射廓线观测水凝运动分离空气运动。该评估包括三个不同的步骤。首先，使用两个并置的轮廓仪在不同的频率下工作，观察明确地确定为布拉格或瑞利散射过程。第二，观测分为空气或水凝物运动只使用一个廓线仪的数据。第三步通过计算正确分类的数量并通过调整计数来定量评估单个轮廓分离技术的性能。
Abstract Profilers operating in the UHF range are sensitive to both Bragg scattering from radio refractive index structure and to Rayleigh scattering from small point targets. Identification of the scattering process is critical for proper interpretation of these observations, especially the data collected from the vertical incident beam. This study evaluates the performance of Doppler velocity thresholds as a means to separate air motions from hydrometeor motions in vertical incident profiler observations. This evaluation consists of three different steps. First, using two collocated profilers operating at different frequencies, the observations are unambiguously identified as Bragg or Rayleigh scattering processes. Second, the observations are separated into either air or hydrometeor motion using only the data from one profiler. The third step quantitatively evaluates the performance of the single profiler separation techniques by counting the number of correct classifications and adjusting the count by...