Ka频段卫星通信系统降雨衰减分析

Ka频段卫星通信因其具有可提供的带宽大(3.5GHz)、通信容量大、波束窄、终端尺寸小,轨道平面内可容纳的卫星多和抗干扰能力强等优势成为未来卫星通信的必然趋势。Ka频段卫星通信面临的一个巨大挑战在于它受气象因素的影响大,这一度使研究人员认为Ka频段卫星通信是不可能实现的。降雨、闪烁、大气吸收等因素都会导致Ka频段地空链路信道质量的恶化。根据Ka频段卫星通信的特点,分析了降雨衰减的特性,提出了几种抗雨衰的办法。

Analysis of Rain Attenuation of Ka-band Satellite Communication System

Ka-band satellite communication system has its advantages,e.g.an offer of a large bandwidth ( 3.5 GHz),a huge capacity of communications,a narrow beam,a reasonably small terminal size and a possible capacity for more satellites on the orbit plane,which makes it an inexorable trend in future satellite communications.The Ka-band satellite communication system is now confronted with a great challenge——it is easily affected by meteorological factors,which,for one time,aroused suspicion among researchers about its realization.Rainfalls,twinkles,as well as atmospheric absorption can all lead to the deterioration of Ka-band ground-to-air link channel quality.This paper gives the feature of Ka band satellite communication,analyses the feature of rain fade and presents several methods of anti rain fade.