摘要
利用现有的地球静止轨道(GEO)卫星资源,构建深空通信中深空探测器到GEO卫星、再到地面站的双跳链路系统。在自由空间链路段载波宜采用较高频率以获得链路增益;在GEO卫星到地面站链路段宜采用10GHz左右的卫星通信窗口以规避大气的相关影响。与传统一跳链路相比,双跳链路系统可以获得更大的信噪比和信道容量,以及更小的误码率。采用现有的GEO地面天线完全能够满足深空通信的要求,提高了系统的可靠性。
Traditional single-hop link is used in deep space communication, which may be greatly affected by kinds of factors in earth＇s atmosphere. Because of the large difference between the free space link, simply improving carrier frequency can not guarantee the reliability of communication. GEO satellite were used in space as relay station, a double-hop system was constructed from deep space explorer to ground stations, which adopted high frequency in free space link and about 10GHz frequency in the second hop link to evade gases＇ influences. Comparing with the single-hop system, the double-hop one obtained more ratio of signal-to-noise and channel capacity and less error rate and also improved system reliability. Existing GEO ground antenngs can meet the requirements of the deep space communication missions.
出处
《中国空间科学技术》
EI
CSCD
北大核心
2008年第1期47-53,70,共8页
Chinese Space Science and Technology
关键词
误码率
信噪比
双跳下行链路
地球静止轨道卫星
深空通信
Bit error rate Signal to noise ratio Double-hop downlinking Geostationary earth orbit satellite Deep space communication
