降雨损耗对Q频段地球静止轨道下行链路I/N分布的影响  

Influence of rain attenuation on the I/N distribution of Q-band geostationary satellite orbit downlink

作　　者：王静 姚秀娟 高翔 智佳 陈托 董苏惠 孙云龙 WANG Jing;YAO Xiujuan;GAO Xiang;ZHI Jia;CHEN Tuo;DONG Suhui;SUN Yunlong(Key Laboratory of Electronics and Information Technology for Complex Space Systems,National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China;School of Electronic,Electrical and Communication Engineering,Univesity of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院国家空间科学中心复杂航天系统电子信息技术重点实验室,北京100190 [2]中国科学院大学电子电气与通信工程学院,北京100049

出　　处：《国防科技大学学报》2023年第1期129-135,共7页Journal of National University of Defense Technology

基　　金：中科院复杂航天系统电子信息技术重点实验室择优基金资助项目(Y42613A32S)。

摘　　要：针对Q频段通信链路受降雨、云雾及大气吸收等天气条件影响较大的传播特性,基于对Q频段地球静止轨道卫星下行链路传播损耗的分析,研究降雨损耗在地球站共址的干扰场景下对I/N分布的影响。提出与降雨分布相结合的Q频段下行链路传播损耗计算方法,建立基于降雨衰减超出门限值的时间百分比p%的I/N函数模型,分析p%对I/N分布的影响,预测年均干扰分布情况。采用该计算方法对ITU实际登记的CHINASAT-G-115.5E卫星网络进行分析,结果表明:p%越低,通信链路受降雨衰减的影响越明显。当p<0.5时,衰减门限值变化较快;在地球站和干扰卫星轨道经度固定的情况下,p%越小,年均1-p%时间内I/N的最小值越小。该方法可应用到研究其他轨道卫星的干扰分布中,为干扰规避提供参考。In view of the propagation characteristics of Q-band communication links that were severely affected by conditions such as rainfall, fog and atmospheric absorption, based on the analysis of the propagation loss of the Q-band geostationary satellite orbit downlink, the influence of rainfall attenuation on the I/N distribution under the interference scenario of the earth station co-location was studied. A method to calculate the propagation loss of Q-band downlink combined with rainfall distribution was proposed, and a functional model for I/N combined p% that the percentage of time when rainfall attenuation exceeds a threshold value was established. The influence of p% on the distribution of I/N was analyzed, and the average annual interference distribution was forecast. This method was used to analyze the influence of the CHINASAT-G-115.5E satellite network which was registered by the ITU, and the results show that the lower the p%, the more obvious the influence of rain attenuation on the communication link. When p<0.5, the attenuation threshold changes faster. When the location of earth station and the orbit longitude of the interfering satellite are fixed, the smaller the p%, the smaller the minimum value of I/N in the annual average 1-p% time. This method can be applied to study the interference distribution of other orbital satellites, and provide a reference for interference avoidance.

关 键 词：频率重叠 降雨衰减 Q频段 干扰计算 下行链路 

分 类 号：TN972[电子电信—信号与信息处理]