ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Research on Homogeneity Evaluation System of Neighboring Weather Radars Based on Single-Station CAPPI Grid Data
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Abstract:
Based on the single-station CAPPI grid data after strict quality control, this paper studies the echo intensity consistency on the equidistant line in the overlapping area of adjacent weather radar observations. According to the elements of radar detection coverage, altitude and precipitation intensity, the automatic matching program of adjacent radar and the automatic selection program of contour plane are compiled, and the homogeneity algorithm of adjacent weather radar is established. Then, three kinds of criteria for evaluating the homogeneity of weather radar echo observation differences in China are formulated, which are credible, suspicious and false, and also the conditions for meeting the evaluation criteria are given. A national real-time weather radar homogeneity evaluation system is successfully established. The evaluation results show that the homogeneity evaluation system can detect the echo consistency of different bands, different radar models and adjacent radars in different provinces in real time and efficiently, and give the evaluation results. By evaluating the homogeneity of one-hour precipitation process of radar in Zhejiang, Fujian and Guangdong Provinces, 27 S-band radars participated in the evaluation. The overall credibility rate of the 27 radars was 85.19%, the suspicious rate was 11.11% and the suspicious error rate was 3.7%. In addition, the problems of low radar echo intensity, beam blocking and electromagnetic interference are successfully detected. The uniformity analysis of radar echo at Linyi Station shows that the evaluation system can alarm in time, detect the deviation of radar echo position pointing at Linyi Station, and the azimuth of antenna shifts clockwise by 16.88°, which shortens the fault detection time.
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