非球形冰晶在94/220 GHz毫米波的散射特性模拟计算

针对94/220 GHz双频雷达的数据处理，分析了不同形状冰晶对这两个波段的单散射特性及衰减特性，探讨了单形状冰云及具体冰云模型的回波特性，结果表明： 1)当冰晶较大时，冰晶的后向散射及衰减对冰晶形状较敏感，相同最大尺度下，六角形冰晶后向散射及衰减最大、子弹花次之、雪花最小；2)单形状冰晶云的雷达反射率因子对冰晶形状、冰水含量、滴谱的中值尺度较敏感，同样滴谱条件下，220 GHz的衰减系数约是94 GHz的5~25倍；3)具体冰云模型的雷达反射率因子随粒子浓度、冰水含量、中值尺度增加而增加，对粒子谱的形状参数敏感性较低.

Abstract

To process the data from 94/220 GHz dual-band radar, the single scattering and attenuation characteristics of ice crystals with different shapes by the two bands were analyzed. The echo characteristics of ice clouds based on single shape ice crystals or a refined model were discussed. The backscatter and attenuation of the larger particles are sensitive to the particle shape. They are the largest for hexagonal ice crystals, greater for bullet, and the least for snow. The radar reflectivity factor (Ze) of ice clouds based on single shape ice crystals are sensitive to the shapes of ice crystals, ice water content and the median dimension of particles size distribution (PSD). The attenuation coefficient of 220 GHz wave is about 5-25 times than that of 94 GHz at the same PSD. Ze of the refined model increases with the particle concentration, ice water content, and median dimension. It is less sensitive to the shape parameters of the PSD.

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吴举秀, 窦芳丽, 安大伟, 陈庆亮, 黄磊, 涂爱琴. 非球形冰晶在94/220 GHz毫米波的散射特性模拟计算[J]. 红外与毫米波学报, 2016, 35(3): 377. WU Ju-Xiu, DOU Fang-Li, AN Da-Wei, CHEN Qing-Liang, HUANG Lei, TU Ai-Qin. Simulation of scattering characteristics of non-spherical ice crystals with 94/220 GHz millimeter-wavelength[J]. Journal of Infrared and Millimeter Waves, 2016, 35(3): 377.

非球形冰晶在94/220 GHz毫米波的散射特性模拟计算

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