| 摘要: |
| 针对贵州威宁X波段双偏振雷达的衰减订正问题，在利用综合小波去噪方法对差分传播相移ФDP进行质量控制基础上，基于自适应衰减订正算法对雷达反射率因子ZH进行衰减订正分析，订正结果与昭通C波段新一代天气雷达进行对比，结果表明：（1）综合小波去噪能够有效去除ФDP存在的脉动和毛刺，保证ФDP的连续性和平滑度；（2）订正前后雷达反射率因子在距离雷达较近处（20-35 km）强度廓线基本重合，订正前后差别不大，随着对流区（雨区）距离的增加，电磁信号出现衰减，订正后反射率值加强，总体上订正后的反射率值比订正前高1-12 dB，其中在35～75 km距离范围内，订正后的反射率值达到50 dBz以上，雷达反射率因子更加接近真实情况；（3）使用综合小波去噪配合自适应衰减订正算法可以提高雷达反射率因子衰减订正的准确率，方法具有普适性，在今后科研业务中可以采用该订正方法以进一步提高对粒子相态识别、降水估测精度。 |
| 关键词: X波段双偏振雷达；雷达反射率因子；小波去噪；自适应衰减订正算法 |
| DOI： |
| 投稿时间：2021-11-27修订日期：2022-04-16 |
| 基金项目:Attenuation Correction Analysis of Reflectivity Factor for X-band Dual Polarization Radar in Weining of Guizhou Province |
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| Attenuation Correction Analysis of Reflectivity for X-band Dual Polarization Radar in Weining of Guizhou Province |
| zengyong,lihuaizhi,Zoushuping,Lihao,Lilili |
| (The Weather Modification Office of Guizhou Province;Guizhou Key Laboratory of Mountainous Climate and Resource) |
| Abstract: |
| Aiming at the attenuation correction problem of X-band dual polarization radar in Weining of Guizhou Province, based on the quality control of differential propagation phase shift ФDP by using comprehensive wavelet de-noising method, the attenuation correction analysis of radar reflectivity factor ZH was carried out based on adaptive attenuation correction algorithm. The correction results are compared with the new generation of Zhaotong C-band weather radar, and the results show that: (1) Comprehensive wavelet de-noising can improve the quality of radar reflectivity factor ZH, it can effectively remove the pulsation and burr of ФDP and ensure the continuity and smoothness of ФDP. (2) The intensity profiles of radar reflectivity factor before and after correction were basically coincident in the vicinity of the radar (20-35 km), and there was little difference between before and after correction. With the increase of the distance in the convective area (rain area), the electromagnetic signal decays, and the reflectivity value after correction was strengthened. Generally, the reflectivity factor value after correction was 1-12 dB higher than that before correction, in which the reflectivity value was between 35 km and 75 km range, the corrected reflectivity factor was more than 50 dBz, and the radar reflectivity factor was closer to the real situation. (3) The accuracy of radar reflectivity factor attenuation correction can be improved by using comprehensive wavelet de-noising combined with adaptive attenuation correction algorithm. The method is universal. This correction method can be used in the future scientific research business to further improve the accuracy of particle phase recognition and precipitation estimation. |
| Key words: X-band dual polarization radar; radar reflectivity factor; wavelet denoising; adaptive attenuation correction algorithm |
