摘要
目前 ,通信卫星系统普遍采用星上信号处理技术。为了满足高容量系统的要求 ,近几年发展了许多新的技术 ,其中为了解决多个点波束区域的通信 ,被称为时分多址 /星上交换 (TDMA/SS)技术便应运而生。因为使用TDMA时 ,一方面需要所有地球站的时间系统与同一参考源保持同步 ,另一方面 ,参考源也必须与卫星上的同步窗相关。二十世纪七十年代 ,许多学者提出了各种各样的TDMA/SS同步解决方案 ,在此详细论述了TDMA/SS系统同步中的一些主要问题 ,对解决同步的方案作了比较 。
On board processing of signals in a communications satellite will become a reality soon.To meet the needs of high capacity system,new technologies are being developed,and one of the most recent is the system known as time division multiple access,satellite switched(TDMA/SS)which is suitable for multiple spot beam zones.Since TDMA is employed,it is necessary to synchronize all the time system of the earth station with a common reference, which,in this case,needs to be related to the Sync window of the satellite.In the 1970s,a number of papers focused on the synchronization for this system. In this paper,the various techniques that have been proposed are described and compared to each other briefly,and the characteristics are analysed.
出处
《陕西天文台台刊》
CSCD
2001年第1期65-73,共9页
Publications of The Shaanxi Astronomical Observatiory
