Ka频段卫星动中通链路雨衰预测与对策分析

Rain Attenuation Prediction and Countermeasures Analysis for Ka-band SOTM Link

受周围环境特别是降雨的影响,卫星动中通(STOM)的通信链常常会发生信号衰减、甚至通信中断。针对这一问题,基于ITU-R模型分析并得到了Ka频段卫星通信链路雨衰预测结果。通过实验对比发现,相比于发射端,接收端受低链路降雨影响较小,动中通适用于接收端。分别研究了改变调制方式、编码方式、降低传输速率和选取高增益天线等4种降低雨衰影响方法,给出了不同降雨量下相应的有效解决策略,为动中通在不同降雨衰减环境下的链路设计及通信提供了技术支撑。

Because of the influence of the surrounding environment,especially rainfall,the communication link of STOM(Satcom on-the-move)often suffers from signal attenuation and even communication interruption.For this problem,the rain attenuation prediction result of the Ka-band satellite communication link is obtained by analyzing based on the ITU-R model.In addition,through the experimental comparison,it is found that the receiving end is less affected by the low link rain than the transmitting end,which illustrates that the communication on-the-move is more suitable for the receiver end.Finally,four methods to reduce the influence of rain attenuation,including changing the modulation method,encoding method,reducing transmission rate,and selecting high-gain antennas,are investigated respectively,and then corresponding effective solutions are given under different rainfalls.These provide technical support for the link design and communication in different rainfall attenuation.