复折射 meaning in English

double refraction

This paper studies dielectric characters of rain and fog , calculate the equivalent complex refraction constant of rain and fog and find them prediction models using linear and non - liner system identification method , get average value of complex refraction constant in different rainfall rate range of rain
本篇论文利用系统辨识方法（线性、非线性）研究了雨、雾的介电特性，计算了雨的等效复折射指数，给出了其预报模型及不同降雨率区间上的平均值；计算了雾的等效复折射指数，给出了预报模型。