论文标题
从十年的西非卫星衍生的气象数据中估算无线电折射率
Estimation of Radio Refractivity from a Decade Satellite Derived Meteorological Data for West Africa
论文作者
论文摘要
无线电折射率是无线电信号通过媒体传播的弯曲，在涉及地面大气电磁传播的作品中非常重要，例如点对点微波通信，地面无线电和电视广播，移动通信系统等。这项研究集中在西非地区，发现该地区的折射率随着身高和从海岸向沙漠而呈指数差异。通常，发现折射率梯度范围在-46.48至-29.51 n-units/km（k因子值为1.23和1.42之间），整个区域之间分裂了子折叠和超级折段。发现折射类型的变化遵循整个西非地区的季节性模式，在干旱季节中占主导地位，在潮湿季节，在沿海地区大部分地区占主导地位。
Radio refractivity, which is the bending of radio signal as it propagates through media, is very important in works involving terrestrial atmospheric electromagnetic propagation such as point-to-point microwave communication, terrestrial radio and television broadcast, mobile communication system, and so on. This study has focused on the West African region where it was found that the region has a refractivity which varies exponentially with height and from the coast towards the desert. Generally, refractivity gradient was found to range between -46.48 and -29.51 N-units/km (k-factor value of between 1.23 and 1.42) across the region, splitting the between sub- and super-refraction. The variation in refraction type was found to follow seasonal pattern across the West African region, with sub-refraction dominating during dry season and super-refraction dominating most part in the coastal area during the wet season.
