Affiliation:
1. The National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao, China
Abstract
Rain height is crucial for rain attenuation prediction along slant paths, such as Earth-space links. The global digital map of the mean annual rain height is given in Recommendation ITU-R P.839-4. The disadvantage of this model is that heavy rainfall in most regions of the middle and high latitudes of the world is typically concentrated over a few months, such as summer in North China, and the mean rain height during these months and the mean annual rain height are often significantly different. In this study, a new weighted mean annual rain height is proposed by using the ratio of the mean monthly rainfall to the mean annual rainfall as the weight. The analysis shows that the weighted mean annual rain heights have been closer to the statistical rain heights during heavy rainfall in general. On the other hand, the work of this paper helps to improve the accuracy of the rain attenuation prediction model on Earth-space links in China. However, the weighted mean annual rain heights have different characteristics for different rainfall climate zones. This study will contribute to the research of rain attenuation modelling on Earth-space links.
Funder
National Natural Science Foundation of China
Subject
Electrical and Electronic Engineering
Reference14 articles.
1. Statistic characteristics of the 0°C isotherm height over some regions in China;J. Huang,1993
2. A simple model for the estimation of rain-induced attenuation along earth-space paths at millimeter wavelengths
3. Estimation of rain height from rain rate using regression-based statistical model: application to seawinds on ADEOS-II;B. Natarajakumar,2004
4. Estimation of Effective Rain Height at 29 GHz at Amritsar (Tropical Region)