Rain is one of the most dominant factors for satellite communication systems link performance at frequencies above 10 GHz, increasing rapidly at higher frequencies. The prediction of time dynamics of the rain attenuation is required to improve the efficiency of various fade mitigation techniques (FMTs) to reduce signal fading. Fade duration and fade slope statistics are used to describe the dynamic behavior of attenuation experienced by radio communication links. The present study is based on experimental measurements from a Ka band (KaSAT) and Q band (AlphaSAT) beacon receiver at the frequencies 19. 7 GHz and 39. 4 GHz respectively. In this paper, annual and monthly variation of rain attenuation statistics for a temperate location Vigo, Spain is presented. Monthly variation of rain attenuation statistics is much larger than the yearly variation for the present location. This paper also analyzes the fade duration and fade slope statistics for both the bands. The conditional probability density function (PDF) of fade slope shows general symmetry between positive and negative slope values for both Ka and Q bands. All the measured statistics (1st order and 2nd order) are compared with the existing ITU-R and COST-205 models. Predictions of rain attenuation by both the models are close to the measured data. For fade duration statistics, as attenuation threshold increases, performance of both ITU-R and COST-205 models improves for Ka band. For Q band, COST model performs better compared to ITU-R model. Measured probability density function of fade slope fits with the ITU-R model more closely for Q band compared to Ka band.

降雨是影响 10 GHz 以上频率的卫星通信系统链路性能的最主要因素之一，在较高频率下会迅速增加。需要对雨衰的时间动态进行预测，以提高各种衰落缓解技术 (FMT) 的效率，以减少信号衰落。衰落持续时间和衰落斜率统计用于描述无线电通信链路经历的衰减的动态行为。本研究基于分别在 19. 7 GHz 和 39. 4 GHz 频率的 Ka 波段 (KaSAT) 和 Q 波段 (AlphaSAT) 信标接收器的实验测量。在本文中，介绍了西班牙维戈温带地区雨衰统计的年和月变化。雨衰统计的月变化远大于当前位置的年变化。本文还分析了两个频段的衰落持续时间和衰落斜率统计数据。衰落斜率的条件概率密度函数 (PDF) 显示了 Ka 和 Q 频带的正负斜率值之间的一般对称性。所有测量的统计数据（一阶和二阶）都与现有的 ITU-R 和 COST-205 模型进行了比较。两种模型对雨衰的预测都接近于实测数据。对于衰落持续时间统计，随着衰减阈值的增加，ITU-R 和 COST-205 模型在 Ka 频段的性能都会提高。对于 Q 波段，与 ITU-R 模型相比，COST 模型的性能更好。