CAJ | 학술논문

本文利用随机微分理论研究了卫星通信中雨衰的统计特性，首先利用非线性变换得到了雨衰的随机微分方程，然后利用福克尔-普朗克（Fokker-Planck）方程给出了雨衰的概率密度函数，最后利用Ito?公式推导出了雨衰的功率谱密度函数，并通过实测数据验证了所提方法的准确性。
본문이용수궤미분이론연구료위성통신중우쇠적통계특성，수선이용비선성변환득도료우쇠적수궤미분방정，연후이용복극이-보랑극（Fokker-Planck）방정급출료우쇠적개솔밀도함수，최후이용Ito?공식추도출료우쇠적공솔보밀도함수，병통과실측수거험증료소제방법적준학성。
The statistic characteristic of rain attenuation is analyzed in the paper according to the theory of stochastic differential. Firstly, the stochastic differential equation of rain attenuation is given by using nonlinear transformation, then the Fokker-Planck equation of rain attenuation is presented and the probability density function is given. Finally, the power spectrum density of rain attenuation is obtained by Ito formula, the accuracy is verified by ITU-R data.