中国空间科学技术

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深空通信中利用GEO卫星的双跳下行链路特性研究

李晖;张钦宇;张乃通;   

  1. 哈尔滨工业大学深圳研究生院,哈尔滨工业大学深圳研究生院,哈尔滨工业大学深圳研究生院 深圳518055,深圳518055,深圳518055
  • 发布日期:2008-02-25

Double-hop Downlink Characteristics of GEO Satellite in Deep Space Communication

Li Hui Zhang Qinyu Zhang Naitong(Shenzhen Graduate School,Harbin Institute of Technology,Shenzhen 518055)   

  • Online:2008-02-25

被引次数

12

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。

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

Abstract: 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 antenna's can meet the requirements of the deep space communication missions.