Ground station

Ground station
The Raisting Satellite Earth Station is the largest satellite communications facility in Germany.

A ground station, earth station, or earth terminal is a terrestrial terminal station designed for extraplanetary telecommunication with spacecraft, and/or reception of radio waves from an astronomical radio source. Ground stations are located either on the surface of the Earth, or within Earth's atmosphere.[1] Earth stations communicate with spacecraft by transmitting and receiving radio waves in the super high frequency or extremely high frequency bands (e.g., microwaves). When a ground station successfully transmits radio waves to a spacecraft (or vice versa), it establishes a telecommunications link.

Ground stations may occupy either a fixed or itinerant position. Article 1 § III of the ITU Radio Regulations describes various types of stationary and mobile ground stations, and their interrelationships.[2]

Specialized satellite earth stations are used to telecommunicate with satellites—chiefly communications satellites. Other ground stations communicate with manned space stations or unmanned space probes. A ground station that primarily receives telemetry data, or that follows a satellite not in geostationary orbit, is called a tracking station.

When a satellite is within a ground station's line of sight, the station is said to have a view of the satellite. It is possible for a satellite to communicate with more than one ground station at a time. A pair of ground stations are said to have a satellite in mutual view when the stations share simultaneous, unobstructed, line-of-sight contact with the satellite.[3]

Contents

Telecommunications port

A telecommunications port—or, more commonly, teleport—is a satellite ground station with multiple parabolic antennas (i.e., an antenna farm) that functions as a hub connecting a satellite or geocentric orbital network with a terrestrial telecommunications network.[4]

Teleports may provide various broadcasting services among other telecommunications functions,[5] such as uploading computer programs or issuing commands over an uplink to a satellite.[6]

Earth terminal complexes

In Federal Standard 1037C, the United States General Services Administration defined an earth terminal complex as the assemblage of equipment and facilities necessary to integrate an earth terminal (ground station) into a telecommunications network.[7][8] FS-1037C has since been subsumed by the ATIS Telecom Glossary, which is maintained by the Alliance for Telecommunications Industry Solutions, an international, business-oriented, non-governmental organization. The Telecommunications Industry Association also acknowledges this definition.

Satellite communications standards

The ITU Radiocommunication Sector (ITU-R), a division of the International Telecommunication Union, codifies international standards agreed-upon through multinational discourse. From 1927 to 1932, standards and regulations now governed by the ITU-R were administered by the International Consultative Committee for Radio.

In addition to the body of standards defined by the ITU-R, each major satellite operator provides technical requirements and standards that ground stations must meet in order to communicate with the operator's satellites. For example, Intelsat publishes the Intelsat Earth Station Standards (IESS) which, among other things, classifies ground stations by the capabilities of their parabolic antennas, and pre-approves certain antenna models.[9] Eutelsat publishes similar standards and requirements, such as the Eutelsat Earth Station Standards (EESS).[10][11]

See also

Major earth stations and earth terminal complexes

Notes

  1. ^ "Earth station", Federal Standard 1037C, General Services Administration, 1996, http://www.its.bldrdoc.gov/fs-1037/dir-013/_1872.htm, retrieved 2009-04-23 
  2. ^ ITU Radio Regulations – Article 1, Definitions of Radio Services, International Telecommunication Union, http://life.itu.int/radioclub/rr/art01.htm, retrieved 2009-04-23 
  3. ^ Underkoffler, C.; Webster, A.; Colombo, A., eds. (2007), "View", ATIS Telecom Glossary, Alliance for Telecommunications Industry Solutions, http://www.atis.org/glossary/definition.aspx?id=501, retrieved 2009-04-22 
  4. ^ "teleport", Webster's New World Telecom Dictionary, 2009, http://www.yourdictionary.com/telecom/teleport, retrieved 2009-04-24 
  5. ^ http://www.shincorp.com/IR/SATTEL/annual_ssa/2003_content/glossary.pdf
  6. ^ http://www.bisenius.com/index.cfm?fuseaction=&id=62
  7. ^ "Earth terminal complex", Federal Standard 1037C, General Services Administration, 1996, http://www.its.bldrdoc.gov/fs-1037/dir-013/_1874.htm, retrieved 2009-04-22 
  8. ^ Underkoffler, C.; Webster, A.; Colombo, A., eds. (2007), "Earth terminal complex", ATIS Telecom Glossary, Alliance for Telecommunications Industry Solutions, http://www.atis.org/glossary/definition.aspx?id=7510, retrieved 2009-04-22 
  9. ^ (PDF) Intelsat Earth Station Standards (IESS) – Document IESS–207 (Rev. 4), Eutelsat Communications, 2005-05-10, http://ww2.intelsat.com/pdf/en/resources/earthstations/IESS-207E.pdf, retrieved 2009-04-22 
  10. ^ Earth Station Minimum Technical and Operational Requirements (Standard M, EESS 502 Issue 11 Rev 1), Eutelsat Communications, http://www.eutelsat.com/satellites/4_5_1_2.html, retrieved 2009-04-22 
  11. ^ Eutelsat Approved Equipment, Eutelsat Communications, http://www.eutelsat.com/satellites/4_5_1_5.html, retrieved 2009-04-22 

External links


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