Use of the HYCELL model for predicting rain attenuation on UAS low elevation datalinks
Use of the HYCELL model for predicting rain attenuation on UAS low elevation datalinks
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使用 HYCELL 模型预测 UAS 低海拔数据链的雨衰
DOI：
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发表时间：
2010
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通讯作者：
Lemorton Joel
中科院分区：
文献类型：
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作者：
Kourogiorgas Charilaos;Feral Laurent;F. Vincent;J. Nicolas;Lemorton Joel
提出了一种基于HYCELL模型的低海拔路段降雨衰减预报新方法。利用降雨率的累积分布函数（CDF）和特定地区的降雨发生概率作为HYCELL的输入，在世界不同地点的中尺度（即150×150 km²）上模拟雨场。根据链路的几何（路径长度、仰角）和无线电波（频率、极化）特征，将模拟雨场转换为雨衰减场。利用蒙特卡罗技术计算了低至0°海拔角链路和Ku、Ka波段不同频率下降雨衰减的长期CDF。该方法适用于距离发射机不到150公里的任何仰角的Ku和Ka频段的UAS数据链。结果与ITU-R DBSG3数据库提供的地球-卫星和地面链路的实验分布进行了比较。结果还与ITU-R P.618和P.530建议书进行了比较。结果表明，由HYCELL得出的降雨衰减预测接近考虑的DBSG3测量值，在某些情况下，比由国际电联建议书得出的衰减预测更准确。
A new approach based on the HYCELL model for predicting the rain attenuation on low elevation links is presented. Using the Cumulative Distribution Function (CDF) of rainfall rate and the probability of rain occurrence for a specific region as an input to HYCELL, rain fields are simulated at mid-scale (i.e. 150×150 km²) for different locations in the world. From the geometrical (path length, elevation angle) and radiowave (frequency, polarization) characteristics of a link, the simulated rain fields are then converted into rain attenuation fields. Monte-Carlo technique is used to compute the long-term CDF of rain attenuation for links with elevation angles as low as 0° and for different frequencies at Ku and Ka bands. The methodology is applied on UAS datalinks operating at Ku and Ka frequency bands located at any elevation angles in a distance of less than 150 km from the transmitter. The results are compared to experimental distributions provided by the ITU-R DBSG3 database for Earth-satellite and terrestrial links. The results are also compared to Recommendations ITU-R P.618 and P.530. It is shown that the predictions of rain attenuation derived from HYCELL are close to the considered DBSG3 measurements and, in some cases, more accurate than the attenuation prediction derived from ITU Recommendations.