按照国际电信联盟（ITU）定义的电信基本术语，无线线路（或称无线链路）是指由无线电发信机和无线电收信机提供的信道。卫星通信链路是无线链路中的一种，其基本组成是由一地球站发射机到卫星转发器的上行链路，和卫星转发器到另一地球站接收机的下行链路。由于从地球站发射的 According to the basic telecom terminology as defined by the International Telecommunication Union (ITU), a wireless line (or radio link) refers to a channel provided by a radio transmitter and a radio receiver. A satellite communication link is one of the radio links consisting essentially of an uplink from one earth station transmitter to a satellite transponder and a downlink from a satellite transponder to another earth station receiver. Due to launch from earth station