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试述INMARSAT系统的组成和各部分的作用?

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NMARSAT卫星系统由空间段,地面段和移动地球站组成空间段:空间段主要以通信卫星为主,主要是对接收信号起中继放大和转发作用,是由星上的通信装置中的转发器和天线完成。地面段:包括卫星控制中心,跟踪、遥测和指令站及所有地球站。这些地球站的主要功能是将待传送的信号发射到卫星,以及接收来自卫星的信号。移动地球站:INMARSAT的用户设备,不同的INMARSAT系统使用不同的MES,船舶使用的MES又称为传播地球站SES,简称船站。MES具有发射和接收信号的功能,通过它所配置的终端设备可以实现所需的通信。船站具有海上遇险报警的功能,陆上移动终端则不予许。

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