地面微波与卫星微波传输系统的区别

地面微波传输系统(TMTS)：
在这些系统中，信号极其集中，物理路径必须是视线。这些系统中的信号在中继塔的帮助下得到扩展。地面微波系统需要定向抛物面天线来广播和接收低千兆赫范围内的信号。

卫星微波传输系统(SMTS)：
卫星微波传输系统使用卫星进行信号的广播和接收。这些系统需要位于地球上空 36000 公里的地球静止轨道上的卫星。卫星作为具有接收天线、转发器和信号传输的中继器运行。

地面微波和卫星微波传输系统的区别如下：

	Terrestrial Microwave Transmission System	Satellite Microwave Transmission System
1.	The frequency range needed is from 4 GHz to 6 GHz.	The frequency range used in this system is between 11 GHz to 14 GHz.
2.	In this system, attenuation mainly depends on frequency and signal strength.	Attenuation is generally affected by the frequency and power.
3.	In terrestrial microwave transmission system, signal requirements make installation moderately difficult.	In satellite microwave transmission system, the installation of satellites is extremely tough.
4.	It requires focused signals and line of sight as physical path.	It requires the proper alignment of earth station antennas.
5.	In these systems, short distance systems can be inexpensive but long distance systems are almost costly.	These systems are very expensive as cost of building and launching is very high.
6.	Relay towers are used to extend the signals.	Satellites are used for the expansion of signals.