吴琼,商建,仰美霖,杨虎. 0. 基于粒子谱分布的机载雷达波束匹配情况研究[J]. 气象学报, (0):-, doi:10.11676/qxxb2021.030
基于粒子谱分布的机载雷达波束匹配情况研究
Study on the beams match of Airborne Radar Based on Drop Size Distribution
投稿时间:2012-09-14  修订日期:2012-12-13
DOI:10.11676/qxxb2021.030
中文关键词:  机载双频降水雷达,粒子谱,Mie散射
英文关键词:Airborne dual-frequency rain radar,Drop size distribution,Mie scatter
基金项目:国家自然科学基金;其它
作者单位邮编
吴琼 国家卫星气象中心 100081
商建 国家卫星气象中心 100081
仰美霖 北京市气象局大气探测技术保障中心 100089
杨虎 国家卫星气象中心 100081
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中文摘要:
      基于机载双频降水雷达外场校飞试验中获取的有效降水测量数据,利用Ku波段的雨衰系数和等效雷达反射率因子的比值估算了粒子谱参数。在此基础上,通过Mie散射模拟计算了Ka波段在该滴谱分布下的等效雷达反射率因子,并和机载Ka波段衰减订正后的等效雷达反射率因子进行了比对。结果表明:两者的廓线基本重合,相关系数超过0.95,两部雷达探测的目标物一致,测量的雷达反射率因子的差异主要是由雷达频点的不同所引起的后向散射以及衰减的不同所造成的,波束匹配精度较高。此外,单频粒子谱参数的估计依赖于单频衰减订正的精度。机载雷达外场试验中探测的都是弱降水,Ku波段衰减订正不会存在太大的误差,估计的粒子谱较为可靠。必须指出的是,精确的参数估计仍然要借助双频的反演方法。
英文摘要:
      Taking the observed valid rain data in the airborne dual-frequency rain radar filed campaign on the October 11, 2010(BT) estimated the drop size parameters by using the ratio of Ku band rain attenuation coefficient and effective radar reflectivity factor. Based on it, simulated the effective radar reflectivity factor of Ka band and compared it with the effective radar reflectivity factor detected by airborne Ka band after attenuation correction. As a result, the simulated and observed Ka band radar reflectivity factor profile is almost coincidence and the correction coefficient is above 0.95. What’s more, the detect object is same for the dual-frequency radar and the difference of measured radar reflectivity factor between Ka and Ku is caused by the difference of radar frequency. The results informed the good beams match situation between airborne radar. In addition, the estimated drop size parameters by single frequency relied on the precision of attenuation correction. Fortunately, the rain detected by airborne radar is weak, so, the attenuation correction of Ku band is reasonable and drop size parameters is reliable. But, the drop size parameters estimation with a high precision still needs the dual-frequency rain retrieval method.
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