Some second order rain attenuation statistics such as fade duration and fade slope are investigated on the basis of experimental measurements of received signals using the GSAT-14 satellite beacon signal at 20.2 GHz for three years (2014–2016) over the tropical location Ahmedabad (23.02 ⁰E, 72.51⁰N), India with an Elevation angle of 63⁰. Existing models of fade duration are compared with experimental data in this study and exponent of power law model of fade duration at Ka band is further explored. A new model for fade duration for Ka band for tropical locations is proposed where the constant of exponent of attenuation in the power law is found to be 0.143 instead of 0.055 used in ITU-R. Other relevant parameters for implementation of fade mitigation technique to prevent the link outage like cumulative distribution of signal fade rate, maximum and minimum fade rise and fade fall are also studied. Fade slope asymmetry over tropical region is also investigated. Keeping in view of exploiting the commercial launch of Ka band in Indian region there is an urgent need for validation of the existing models of fade slope (specially looking into fade symmetry) and fade duration. It will help the SATCOM (Satellite Communication) link designer to improve closed loop fade mitigation technique to minimize the possible link failure/link outage over the tropical region.

在热带地区艾哈迈达巴德（23.02）上，使用GSAT-14卫星信标信号在20.2 GHz下进行了三年（2014-2016年）接收信号的实验测量，对一些二阶降雨衰减统计数据（例如衰落持续时间和衰落斜率）进行了研究。⁰ E，72.51 ⁰ N），印度，仰角为63 ⁰。本研究将现有的衰落持续时间模型与实验数据进行了比较，并进一步探索了Ka波段衰落持续时间的幂律模型的指数。提出了一种热带地区Ka波段衰落持续时间的新模型，在该模型中，幂律中的衰减指数常数为0.143，而不是ITU-R中使用的0.055。还研究了用于实现衰减缓解技术以防止链路中断的其他相关参数，例如信号衰减速率的累积分布，最大和最小衰减上升以及衰减下降。还研究了热带地区的衰落斜率不对称性。考虑到利用印度地区Ka频段的商业化发展，迫切需要验证现有的衰落斜率模型（特别是研究衰落对称性）和衰落持续时间模型。