基于指数雨胞雨衰模型的微波链路雨强反演方法

A microwave link rain intensity inversion method based on exponential rain cell rain attenuation model

为了提高微波链路雨强反演的准确性,基于指数雨胞雨衰模型提出了一种新的微波链路雨强反演方法,并利用瑞典哥德堡市21条微波链路和距链路2 km范围内8个雨量站的实测数据,将指数雨胞雨衰模型与传统幂律模型和ITU-R P.530-16雨衰模型进行了雨强反演对比。结果表明:指数雨胞雨衰模型在雨强反演方面表现优异,决定系数和纳什效率系数均为0.78,平均绝对误差为0.39 mm/h,均方根误差为0.68 mm/h;与幂律模型相比,指数雨胞雨衰模型在准确度和稳定性方面有显著提升,与ITU-R P.530-16雨衰模型相比也有所改进,特别是在短链路和中小雨的雨强反演中表现出明显的优势,对于进一步提升微波链路雨强反演精度和改善降水监测效果具有重要价值。

A new microwave link rain intensity inversion method was proposed based on the exponential rain cell rain attenuation model to improve the accuracy of rain intensity inversion.Using measured data from 21 microwave links and 8 rainfall stations within 2 km from the links in Gothenburg,Sweden,rain intensity inversion results of the exponential rain cell rain attenuation model were compared with those of the traditional power-law model and ITU-R P.530-16 rain attenuation model.The results show that the exponential rain cell rain attenuation model performed excellently in rain intensity inversion,with both the determination coefficient and Nash-Sutcliffe efficiency coefficient being 0.78,the mean absolute error being 0.39mm/h,and the root-mean-square error being 0.68 mm/h.The exponential rain cell rain attenuation model has a significant improvement in accuracy and stability compared to the power-law model,and also has an improvement compared to the ITU-R P.530-16 rain attenuation model,especially in rain intensity inversion of short links and small to medium rainfalls.It is also demonstrated that the exponential rain cell rain attenuation model is valuable for further enhancing the accuracy of microwave link rain intensity inversion and improving the effectiveness of precipitation monitoring.