新一代天氣雷達均一性評估
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國家重點研發計劃“分級質控和多源資料快速融合分析技術”(2018YFC1507502)、中國氣象局預報預測業務(OT20191085)項目資助


Evaluation of Homogeneity of New Generation Weather Radar
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    摘要:

    為實現對全國天氣雷達不同波段、不同型號、不同區域的回波差異進行檢測和評估,確保雷達組網數據的均一性,利用經過嚴格數據質量控制后的單站雷達CAPPI格點數據,建立了可靠的相鄰雷達回波強度均一性檢測算法,并根據我國天氣雷達回波差異實際狀況制定了均一性評估標準,實現均一性算法的業務運行,使雷達觀測同一區域回波反射率的實時均一性評估成為可能。從評估結果來看:①S波段雷達整體均一性強于C波段雷達,SA雷達均一性狀況最好,CC、CD雷達均一性狀況較差;②以SA型號雷達為主的華東、華南地區均一性較好;③雷達波段不一,型號繁多的偏遠區域均一性較差。均一性評估系統對有回波但回波強度、回波位置不正確以及雷達數據時間錯位的情況,能有效彌補其他質控算法的短板,及時發現雷達回波異常,縮短故障修復時間,提高雷達數據準確性。

    Abstract:

    In order to detect and evaluate the echo differences of different bands, models and regions of the national weather radar and to ensure the homogeneity of radar networking data, a reliable detection algorithm for the homogeneity of adjacent radar echo intensity is established by using the CAPPI lattice data of singlestation radar after strict data quality control. According to the actual situation of weather radar echo difference in China, the uniformity evaluation criteria are formulated and the operational running of homogeneity algorithms is realized, which makes it possible to evaluate the realtime uniformity of radar echo reflectivity in the same area. From the evaluation results, the overall homogeneity of Sband radar is stronger than that of Cband radar. The SA radar has the best homogeneity, while the CC and the CD radar have the worse homogeneity. The eastern and southern China, where SA radar is used widely, have better homogeneity. The radar bands are different and the homogeneity of remote areas with various models is poor. The homogeneity evaluation system is applied to the case of having echo intensity, but with incorrect echo location and time misalignment of radar echoes. It can effectively compensate for the shortcomings of other quality control algorithms. It can find abnormal radar echoes in time, shorten the repair time and improve the accuracy of radar data.

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葉飛,梁海河,文浩,銀蓮,李林蔚.新一代天氣雷達均一性評估[J].氣象科技,2020,48(3):322~330

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  • 收稿日期:2019-06-18
  • 定稿日期:2019-12-27
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  • 在線發布日期: 2020-06-18
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