摘要
基于海口站接收的为期一年的中卫一号卫星12.5GHz信标数据,分析了降雨过程中衰落斜率的统计分布特性。衰落斜率的条件概率分布表明正负衰落斜率满足对称分布,并对这一结论进行了验证;基于实测衰落斜率的累积分布特性,重新拟合了VandeKamp模型中的衰落斜率标准偏差,并建立了该参数与衰减电平和时间间隔之间新的关系式。比较了VandeKamp模型、Salonen模型和改进模型的预测误差,改进模型在该地区具有最好的预测精度。
A statistical analysis is made of the measured distribution of fade slope of rain attenuation, measured at Haikou from the ChinaStar-1 at the frequency of 12. 5GHz. The distribution of conditional probability density of fade slope shows that the positive and negative slopes are distributed symmetrically. The standard deviation of fade slope which is the only parameter in VandeKamp model is refitted to fit the cumulative distribution of fade slope and a new relationship of this parameter to attenuation level and time interval is proposed. By comparison with the VandeKamp model and Salonen model, the improved model obtains the best accuracy.
出处
《电波科学学报》
EI
CSCD
北大核心
2012年第5期906-912,共7页
Chinese Journal of Radio Science
基金
国家自然科学基金(No:61179003)
宇航动力学国家重点实验室(2011ADL-DW0301)
