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1.2 卫星移动通信业务□□现代的卫星移动通信系统其用户终端已小到可用手持机进行通信。这种以手持机用户终端为主的卫星移动通信系统按轨道分有两类 ,一类是中、低轨道全球覆盖的卫星移动通信系统 ;另一类是静止轨道的区域覆盖的卫星移动通信系统。两类典型系统特性分别见表
1.2 Satellite Mobile Communications □ □ Modern satellite mobile communication systems have small user terminals that can communicate with handsets. This kind of satellite mobile communication system based on handset user terminals is divided into two types according to the orbit: one is a satellite mobile communication system covered by a medium or low orbit; and the other is a satellite mobile communication system covered by a geostationary orbit . Two typical system characteristics are shown in the table