国际海事卫星组织(Inmarsat)使用其卫星数字信号传输网的全球收费卫星电话系统已于1996年投入营运。用户发出的电话信号由全球22个地球站当中最邻近的一个发射给卫星。由卫星传送到与受话点最邻近的地球站,再接通当地通信网络。该系统的独立性能强,可以依靠太阳能电池板 Inmarsat’s global pay satellite telephone system using its satellite digital signal transmission network was put into operation in 1996. Telephone signals from users are transmitted to satellites by the nearest one of the 22 earth stations in the world. From satellite to the earth station closest to the receiving point and then to the local communication network. The system’s independence is strong and can rely on solar panels