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 ?
Cobbett Hill Earthstation will leverage a new iDirect satellite hub to expand its services in EMEA for VNOs, Internet service providers (ISPs) and enterprise and government customers.
MFN) (Nasdaq:MFNX), the leader in deployment of optical IP Internet infrastructure within key metropolitan areas internationally, will provide fiber-optic infrastructure to EarthStation Netaxs (EarthStation), a first-Tier Internet Service Provider (ISP).
19 /PRNewswire/ -- In response to the email received today from the Motion Picture Association of America (MPAA) to Earthstation 5 for copyright violations for streaming FIRST RUN movies over the internet for FREE, this is our official response
This offer enables Triumph clients the ability to transmit video to and from a premier International Earthstation complex by way of Triumph's national fiber network, at a packaged rate, just as if the Earthstation was situated in the client's backyard.
JENIN, West Bank, July 28 /PRNewswire/ -- Earthstation 5 today declares war against the sex industry for all the sex located on the internet.
This signal is being transmitted from Bridgeport, CT on Triumph's Video Fiber Optic Network to the US Electrodynamics earthstation in Whitinsville, MA then digitally compressed and uplinkied to the Loral Telstar 4 satellite.
Electrodynamics earthstation, in Whitinsville, MA, for uplink to Televisa's transponder on PAS 3R.
JENIN, West Bank, July 1 /PRNewswire/ -- "Apparently the threats of the RIAA appear to be backfiring, at least in the case of Earthstation 5," says Ras Kabir, president of Earthstation 5, a new file sharing software and network recently launched from Palestine.
The first awarded license for VSAT/satellite and earthstation services allows the China JV to focus on low band "last mile" Internet access using satellite technology to provide transmission at speeds in excess of 2Mbps.