Satellite communications links add capacity to the present communication system and provide additional alternate routing for communication traffic. Satellite is composed of three separate units that is fuel system, the satellite and telemetry controls and the transponder. Satellite link is a long distance link that interconnects switching centers at different locations.
Satellite phones are available where phone signal is transmitted to an orbiting satellite and then comes back to earth. Satellites are used for global satellite communication. Global communication is used to describe ways to connect, relate and mobilize across geographic, economic and cultural divides. The other common uses of satellites are:
Television
Satellites are the backbone of cable and network TV, it sends television signals directly to homes. The signal is sent from a central station to smaller stations that send the signals locally via cables.
Telephones
Satellites provide routed phone communications on airplanes and also provide voice communication for rural areas and areas where phone lines are damaged after some accident. Primary timing source for cell phones and pagers are also provided by satellites.
Navigation
Navstar Global Positioning Systems (known colloquially as GPS) is a satellite-based navigation system. GPS locators are increasingly included inside car services and allow car-share services. Further use of GPS based system is that it is used by civilians and military for navigation on land, sea and air and other areas where other navigation tools may not exist.
Weather
Satellites helps meteorologists to see weather on a global scale, which in turn helps them to follow the effects of phenomena like volcanic eruptions and burning oil fields and many other.
Many satellites are in operation for different purpose. The operational satellites provide many of the services that are quite important for everyone. Without them the services would not be so nearly to achieve by other means.
