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首页> 外文期刊>Journal of atmospheric and oceanic technology >A Quality Control Concept for Radar Reflectivity, Polarimetric Parameters, and Doppler Velocity
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A Quality Control Concept for Radar Reflectivity, Polarimetric Parameters, and Doppler Velocity

机译：雷达反射率，极化参数和多普勒速度的质量控制概念

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摘要

Over the last few years the use of weather radar data has become a fundamental part of various applications like rain-rate estimation, nowcasting of severe weather events, and assimilation into numerical weather prediction models. The increasing demand for radar data necessitates an automated, flexible, and modular quality control. In this paper a quality control procedure is developed for radar reflectivity factors, polarimetric parameters, and Doppler velocity. It consists of several modules that can be extended, modified, and omitted depending on the user requirement, weather situation, and radar characteristics. Data quality is quantified on a pixel-by-pixel basis and encoded into a quality-index field that can be easily interpreted by a nontrained end user or an automated scheme that generates radar products. The quality-index algorithms detect and quantify the influence of beam broadening, the height of the first radar echo, ground clutter contamination, return from non-weather-related objects, and attenuation of electromagnetic energy by hydrometeors on the quality of the radar measurement. The quality-index field is transferred together with the radar data to the end user who chooses the amount of data and the level of quality used for further processing. The calculation of quality-index fields is based on data measured by the polarimetric C-band Doppler radar (POLDIRAD) located in the Alpine foreland in southern Germany.
机译：在过去的几年中，天气雷达数据的使用已成为各种应用程序的基本组成部分，例如降雨率估算，严重天气事件的临近预报以及与数值天气预报模型的同化。对雷达数据的需求不断增长，因此需要自动，灵活和模块化的质量控制。本文针对雷达反射系数，极化参数和多普勒速度开发了质量控制程序。它由几个模块组成，可以根据用户需求，天气情况和雷达特性进行扩展，修改和省略。数据质量在逐个像素的基础上进行量化，并编码到质量指标字段中，该字段可以由未经培训的最终用户或生成雷达产品的自动化方案轻松解释。质量指标算法可检测并量化波束加宽，第一次雷达回波的高度，地面杂波污染，非天气相关物体的返回以及水凝物对电磁能量的衰减对雷达测量质量的影响。质量指标字段与雷达数据一起传输给最终用户，最终用户选择数据量和用于进一步处理的质量级别。质量指数场的计算基于位于德国南部阿尔卑斯前陆的极化C波段多普勒雷达（POLDIRAD）测得的数据。

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