A communications satellite is an artificial satellite that relays and amplifies radio telecommunication signals via a transponder; it creates a communication channel between a source transmitter and a receiver at different locations on Earth. Communications satellites are used for television, telephone, radio, internet, and military applications.[1] Many communications satellites are in geostationary orbit 22,236 miles (35,785 km) above the equator, so that the satellite appears stationary at the same point in the sky; therefore the satellite dish antennas of ground stations can be aimed permanently at that spot and do not have to move to track the satellite. Others form satellite constellations in low Earth orbit, where antennas on the ground have to follow the position of the satellites and switch between satellites frequently.
The radio waves used for telecommunications links travel by line of sight and so are obstructed by the curve of the Earth. The purpose of communications satellites is to relay the signal around the curve of the Earth allowing communication between widely separated geographical points.[2] Communications satellites use a wide range of radio and microwave frequencies. To avoid signal interference, international organizations have regulations for which frequency ranges or "bands" certain organizations are allowed to use. This allocation of bands minimizes the risk of signal interference.[3]
A communicationssatellite is an artificial satellite that relays and amplifies radio telecommunication signals via a transponder; it creates a communication...
detail the possible use of communicationssatellites for mass communications. He suggested that three geostationary satellites would provide coverage over...
SatelliteCommunications Co., Ltd. known also as SinoSat is a Chinese company. It provided satellitecommunications through a pair of communications satellites...
COMSAT (CommunicationsSatellite Corporation) is a global telecommunications company based in the United States. By 2007, it had branches in Brazil, Argentina...
The Arab SatelliteCommunications Organization (often abbreviated as Arabsat) is a communicationssatellite operator in the Arab World, headquartered in...
Satellite television is a service that delivers television programming to viewers by relaying it from a communicationssatellite orbiting the Earth directly...
military communications. The first military satellites were photographic reconnaissance missions. Some attempts were made to develop satellite based weapons...
similar to Thuraya's. Terrestar: Satellite-phone system for North America. ICO Global Communications: An American satellite-phone company which has launched...
Nigerian CommunicationsSatellite (NIGCOMSAT) Limited is a company under the supervision of the Federal Ministry of Communications and Digital Economy...
first commercial communicationssatellite was Telstar 1, built by Bell Labs and launched in July 1962. The idea of a geosynchronous satellite—one that could...
Starlink with the Federal Communications Commission (FCC). SpaceX trademarked the name Starlink in the United States for their satellite broadband network; the...
Asianet SatelliteCommunications Private Limited, is an Indian multi system operator (MSO). It is the largest cable network services company in Kerala...
Iridium Communications Inc. (formerly Iridium Satellite LLC) is a publicly traded American company headquartered in McLean, Virginia, United States. Iridium...
A satellite constellation is a group of artificial satellites working together as a system. Unlike a single satellite, a constellation can provide permanent...
mission. They are commonly used for geosynchronous satellites, particularly communicationssatellites, but are also used in spacecraft which occupy lower...
Al Yah SatelliteCommunications Company P.J.S.C. (Yahsat) is a public company listed on the Abu Dhabi Securities Exchange (ADX) and a subsidiary of Mubadala...
Milestones in the history of communicationssatellites. Timeline of first artificial satellites by country First images of Earth from space "Appendix B"...
The Defense SatelliteCommunications System (DSCS) is a United States Space Force satellite constellation that provides the United States with military...
The Communications Technology Satellite (CTS), known as Hermes, was an experimental high-power direct broadcast communicationssatellite. It was a joint...
refer to dish antennas that send and/or receive signals from communicationssatellites. Taylor Howard of San Andreas, California, adapted an ex-military...
based on revenues from all customized communications sources and includes operators of teleports and satellite fleets. In order from largest to smallest...
telecommunications, and the first satellite to be placed in this kind of orbit was launched in 1963. Communicationssatellites are often placed in a geostationary...
The Indian National Satellite System or INSAT, is a series of multipurpose geostationary satellites launched by the Indian Space Research Organisation...
referred to as a spy satellite) is an Earth observation satellite or communicationssatellite deployed for military or intelligence applications. The first generation...
with a satellite in geostationary orbit, 35,785 km (22,236 mi) above the Earth; the normal orbit of communicationssatellites, in which the satellite appears...
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