earth station


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earth station

[′ərth ‚stā·shən]
(communications)
A facility with a land-based antenna used to transmit and receive information to and from a communications satellite.

earth station

A ground-based receiving or transmitting/receiving station in a satellite communications system. The counterpart to the earth station is the satellite in orbit, which is the "space station." Earth stations use dish-shaped antennas, the diameters of which can be under two feet for satellite TV to as large as fifty feet for satellite operators. Antennas for space exploration have diameters reaching a hundred feet.

Multiplex, Modulate and Upconvert
An earth station is generally made up of a multiplexor, a modem, up and downconverters, a high power amplifier (HPA) and a low noise amplifier (LNA). Almost all transmission to satellites is digital, and the digital data streams are combined in a multiplexor and fed to a modem that modulates a carrier frequency in the 50 to 180 MHz range. An upconverter bumps the carrier into the gigahertz range, which goes to the HPA and dish.

Downconvert, Demodulate and Demultiplex
For receiving, the LNA boosts the signals to the downconverter, which lowers the frequency and sends it to the modem. The modem demodulates the carrier, and the digital output goes to the demultiplexing device and then to its destinations. See earth station on board vessel and base station.


Earth Station
Earth stations use dish-shaped antennas to transmit and receive microwave signals to and from satellites.







On Board a Ship
Earth stations on board vessels (ESVs) are used to receive TV, make phone calls and access the Internet while traveling near the coast or on the high seas. Encased in a waterproof container, the ESV must be able to track the satellite with great precision. If the ESV deviates by a half a degree, it must shut down transmission immediately in order to not interfere with other satellites. (Image courtesy of Sea Tel Inc., www.seatel.com)
References in periodicals archive ?
Developing the new dual-band Earth station came down to solving a physics principle that simultaneous transmission of Ku- and DBS-bands causes intermodulation or interference on the Earth station's receive band.
The result is a sophisticated Earth station antenna that can simultaneously support direct broadcast satellite transmissions as well as fixed satellite transmissions over the Ku-band," said Tim Shroyer, chief technical officer for SATCOM Technologies.
Earth stations will allow much faster data speeds, as Ofcom is making available a relatively large amount of high-frequency spectrum for their use.
Earth station terminals are priced at approximately $200,000 and up.
Andrew is bringing to market several new pre-engineered Earth Station Terminals that provide major savings by eliminating the need for custom design.
Today the GE Earth Station boasts an 11,000-square-foot building, a 300-foot microwave tower and 18 satellite dishes, including some as large as 70 feet in diameter.
The company that intends to use the earth station can specify a site location to an engineering consultant and see if that site "clears" during a preliminary computer analysis (discussed below).
The commission tentatively concluded that individual ownership and operation of earth station operating with the Intelsat system would permit barriers to build their own stations as marketplace forces dictate, providing users with additional choices, while reducing earth station rates.
Andrew will design and install two new Ka-band gateway earth stations at sites in Minnesota and Washington, and will add equipment to increase the capacity of WildBlue's existing network of gateway earth stations, which Andrew also developed and deployed, in the U.
NYSE: SFA) announced that it has completed installation of a new 18-meter INTELSAT Standard A satellite earth station for BellSouth Chile, a wholly-owned subsidiary of BellSouth Corp.
The critical areas and design considerations involved in the installation of a transmit/receive earth station must be determined and solutions identified prior to the actual installation.