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首页> 外文期刊>International Journal of Satellite Communications and Networks >Rain attenuation statistics at Ka-band estimated from weather radar observations in Belgium
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Rain attenuation statistics at Ka-band estimated from weather radar observations in Belgium

机译：根据比利时的天气雷达观测估计的Ka波段雨衰统计

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摘要

This paper presents rain attenuation statistics for satellite-ground transmission links at Ka-band based on 10-year reflectivity observations from a C-band weather radar. The ground receiving station and the radar are both located in Belgium. Only precipitation under the freezing level is considered, and the attenuation produced by hail is removed by applying a reflectivity threshold. The radar-derived attenuations are analyzed to investigate the influence of elevation and azimuthal angles on the attenuation statistics. It is shown that the azimuthal dependence is extremely low. In contrast, the exceedance probability for a given attenuation threshold strongly increases with decreasing elevation angles, as foreseen by ITU-R recommendations. The radar-derived attenuations are used to estimate rain attenuation complementary cumulative distribution functions computed according to ITU-R recommendations for a low Earth orbit satellite. The sensitivity to the hail reflectivity threshold is very limited. In contrast, our results show that reliable attenuation statistics cannot be obtained without taking carefully into account the height of the freezing level. Monthly averages of the freezing levels allow producing satisfactory results, but it is recommended to incorporate freezing level heights with high temporal and spatial resolutions.
机译：本文基于C波段天气雷达的10年反射率观测结果，介绍了Ka波段卫星地面传输链路的降雨衰减统计数据。地面接收站和雷达都位于比利时。仅考虑冻结水平以下的降水，并且通过应用反射率阈值可以消除冰雹产生的衰减。分析了雷达得出的衰减，以研究仰角和方位角对衰减统计的影响。结果表明，方位角依赖性极低。相反，如ITU-R建议所预见的，给定衰减阈值的超出概率会随着仰角的减小而大大增加。雷达得出的衰减用于估算雨衰的互补累积分布函数，该函数是根据ITU-R建议为低地球轨道卫星计算的。冰雹反射率阈值的灵敏度非常有限。相反，我们的结果表明，如果不仔细考虑冻结水平的高度，就无法获得可靠的衰减统计数据。冻结水平的每月平均值可以产生令人满意的结果，但是建议将冻结水平的高度并入高时间和空间分辨率。

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