Thuraya

Thuraya Telecommunications Company
Industry Satellite phone network operations
Founded 1997
Headquarters United Arab Emirates
Key people
 CEO Samer Halawi
Website www.thuraya.com

Thuraya (Arabic: الثريا‎‎, pronounced [aθːuˈrajːa]), from the Arabic name for the constellation of the Pleiades, "Thurayya",[1] is a regional mobile satellite phone provider. The company is based in the United Arab Emirates; it provides mobile coverage to more than 162 countries in Europe, the Middle East, North, Central and East Africa, Asia and Australia.[2]

With about 350 roaming partners worldwide, Thuraya also offers GSM roaming services over land-based mobile GSM networks. As well, Thuraya sells a dual mode satellite phone with both GSM and satellite capabilities.

The company is headquartered in the United Arab Emirates. Its shareholders consist of investment companies, Middle Eastern and North African telcos; Etisalat is a major shareholder.

Services

Technical details of the network

Virtual country code

Thuraya's country calling code is +882 16, which is part of the ITU-T International Networks numbering group. Thuraya is not part of the +881 country calling code numbering group as this is allocated by ITU-T for networks in the Global Mobile Satellite System, of which Thuraya is not a part, being a regional rather than a global system.

Air interface

Transceivers communicate directly with the satellites using an antenna of roughly the same length as the handset and have a maximum output power of 2 Watts. QPSK modulation is used for the air interface. Thuraya SIM cards will work in regular GSM telephones and ordinary GSM SIM cards can be used on the satellite network as long as the SIM provider has a roaming agreement with Thuraya. As with all geosynchronous voice services a noticeable lag is present while making a call.

Due to the relatively high gain of the antennas contained within handsets, it is necessary to roughly aim the antenna at the satellite. As the handsets contain a GPS receiver it is possible to program the ground position of the satellites as waypoints to assist with aiming. The service operates on L-band carriers assigned in blocks to areas of coverage referred to as "spotbeams", which are Thuraya’s equivalent to cells or service areas. In L-band, 34 MHz of bandwidth from 1.525 GHz to 1.559 GHz is assigned for downlink (space-to-earth) communication, while the uplink (earth-to-space) operates between 1.6265 GHz and 1.6605 GHz. Uplink and downlink channels are 1087 paired carrier frequencies, on a raster of 31.25 KHz. A Time Division Multiple Access (TDMA) time slot architecture is employed which allocates a carrier in timeslots of a fixed length.

Use of GPS

Every Thuraya phone and standalone transceiver unit is fitted with a GPS receiver and transmits its location to the Thuraya gateway periodically.[3][4] The built-in GPS capability can be used for waypoint navigation.

Satellites

Thuraya 2 and a second nearby geostationary satellite, photographed on 8 December 2010 from the Netherlands

Thuraya operates two communications satellites built by Boeing.

Thuraya 1

The first satellite, named Thuraya 1, had deficient solar panels and could not operate properly; this satellite was positioned above Korea for testing purposes. It was launched on 21 October 2000 by Sea Launch on a Zenit 3SL rocket.[5] At launch it weighed 5250 kg.[6] The satellite was used for testing and backup until May 2007, when it was moved to junk orbit and declared at its end of life.[7]

Thuraya 2

Thuraya 2 was launched by Sea Launch on 10 June 2003.[8] It is located in geosynchronous orbit at 44° E longitude, inclined at 6.3 degrees.[9] The satellite can handle 13,750 simultaneous voice calls. This satellite currently serves most of Europe, the Middle East, Africa and parts of Asia. The craft had a weight of 3200 kg and an expected life of 12 years. The two solar-panel wings, each containing five panels, generate 11 KW electric power (at end of life). The craft has two antenna systems: a round C-band antenna, 1.27 meters in diameter and a 12 × 16 meter AstroMesh reflector, 128 element L-band antenna, supplied by Astro Aerospace in Carpenteria, CA. These antennas support up to 351 separate spot beams, each configurable to concentrate power where usage needs it.[10] Amateur astronomer observations suspected the MENTOR 4 USA-202 United States government satellite was dedicatedly eavesdropping on Thuraya 2 and this was reported to be confirmed by documents released on Sep 9, 2016 [11] by the Intercept as part of the Snowden Files.[12]

Thuraya 3

The third satellite was planned for launch by Sea Launch in Q1 2007, and the start of Far East and Australia service was planned for 15 October 2007. The failure in January 2007 of the NSS-8 mission on another Sea Launch rocket led to a substantial delay in the launch of Thuraya-3, which was rescheduled for 14 November 2007, but the launch was postponed several times due to sea conditions.[13] The launch vessels set out from port again on 2 January 2008, and launch occurred successfully at 11:49 GMT on 15 January 2008.[14][15] The Thuraya 3 satellite is technically the same as Thuraya 2, but located in geosynchronous orbit at 98.5° E longitude, inclined at 6.2 degrees.

Subscriber hardware

Handsets

Sleeves

See also

References

  1. ↑ "Arabic stars: Stellarium Wiki".
  2. ↑ Prösch, Roland; Daskalaki-Prösch, Aikaterini (2011). Technical Handbook for Radio Monitoring VHF/UHF: Edition 2011. Norderstedt, Germany: Books on Demand GmbH.
  3. ↑ "XSAT USA plays role in recent K2 mountain rescue". Xsatusa.com. Retrieved 2012-01-10.
  4. ↑ "Electronic Weapons". Strategypage.com. 2003-04-24. Retrieved 2012-01-10.
  5. ↑ "Thuraya 1". NSSDC.
  6. ↑ "Thuraya-1 Complete System for Mobile Communications". Boeing.
  7. ↑ TBS info on Thuraya 1, visited on July 12, 2008
  8. ↑ "Thuraya 2". NSSDC.
  9. ↑ "Sea Launch Past Launches Thuraya-2". Boeing.
  10. ↑ Thuraya 2 and 3 info on Boeing website
  11. ↑ "Documents". The Intercept.
  12. ↑ "The Space Review: A Nemesis in the Sky: PAN, MENTOR 4". The Space Review.
  13. ↑ "Current Mission: Thuraya-3". Sea Launch.
  14. ↑ "Sea Launch Continues Thuraya-3 Mission". SeaLaunch.
  15. ↑ "Sea Launch Delivers Thuraya-3 Satellite to Orbit". Sea Launch.
This article is issued from Wikipedia - version of the 11/22/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.