OneWeb satellite constellation

The OneWeb satellite constellation—formerly known as WorldVu—is a proposed constellation of approximately 700 satellites expected to provide global internet broadband service to individual consumers as early as 2019. The constellation is proposed by the company WorldVu Satellites Ltd., which has used the alternate name L5 in various regulatory filings. The company is registered in St. Helier, Jersey and is expected to require up to US$3 billion in capital by the time the full constellation becomes operational in 2019–2020.[1]

The 640 communication satellites will operate in circular low Earth orbit, at approximately 750 miles (1,200 km) altitude,[2] transmitting and receiving in the Ku band of the radio frequency spectrum.[1]

The company's business plan is attempting to "reach hundreds of millions of potential users residing in places without [existing] broadband access."[1]

History

Early reports of the potential involvement of Google in offering broadband internet services surfaced in February 2014, when a "very large [satellite] constellation" was rumored to be as large as 1600 satellites.[3]

By June 2014, WorldVu had acquired the satellite spectrum that was formerly owned by SkyBridge, a company that previously failed in an attempt to offer broadband internet services via satellite.[4]

As of September 2014, the WorldVu company had 30 employees. In September 2014, several Google employees who had joined Google as part of the acquisition of O3b Networks in 2013—Greg Wyler, Brian Holz and David Bettinger—left Google to become a part of WorldVu Satellites Ltd. The rights to the radio frequency spectrum were transferred to WorldVu. As of August 2014, it was unclear why the WorldVu team left Google, as well as what Google's role might be in WorldVu going forward. At the time, WorldVu was working closely with SpaceX and SpaceX' founder Elon Musk,[5] although no formal relationship had been established and no launch commitments had been made.[6]

In May 2014, the plan was to have at least 20 satellites operating in each of 20 different orbital planes to provide consistent coverage over the surface of the Earth.[1]

By November 2014, the Wall Street Journal was reporting that Musk and Wyler were considering options for building a factory to manufacture high-volume low-cost satellites, and that "initial talks have been held with state officials in Florida and Colorado"[7] about potentially locating a factory in those states, as well as that SpaceX would likely launch the satellites.[7] Also in November, WorldVu issued a tender "to satellite manufacturers for 640 125-kilogram satellites", asking for responses by mid-December, having secured regulatory approval for use of the requisite electromagnetic spectrum communication frequencies in mid-2014.[8][9]

The 2014 OneWeb solicitation to satellite manufacturers was for a total build of approximately 900 small Internet-delivery satellites, including ground and on-orbit spares. Responses were received from both European and US manufacturers including Airbus Defence and Space, Lockheed Martin Space Systems, OHB AG, SSL and Thales Alenia Space, and discussions have focused on how each of these companies "are going to escape their status-quo histories as major space hardware contractors and remake themselves into producers capable of producing multiple satellites per month, each with a cost of less than US$500,000."[10] OneWeb announced that it plans to form a joint venture with the winning bidder and open a new facility for manufacturing the new smallsats.[10]

In January 2015, the Wall Street Journal reported that WorldVu, now operating under the name OneWeb LTD, had secured funding from Virgin Group and Qualcomm to build and launch the constellation, while SpaceX was not an investor and their role in the venture was not clear. OneWeb also divulged that the planned satellites will weigh approximately 125 kg (276 lb) and that plans are to deploy approximately 650 of them in low Earth orbit to operate at 1,200 kilometers (750 mi) altitude.[11][12] A few days later, Elon Musk announced a different internet satellite venture, with the opening of a major new product development facility in Seattle, with the intent of taking SpaceX itself into the business of internet provision and internet backhaul services, aiming to build an approximately 4000 satellite constellation, with the first generation becoming operational in approximately 2020.[13]

The satellites for the OneWeb constellation were initially announced to be in the 110 kilograms (250 lb)-class, about the same size as the 2 Earth-imaging satellites that are operated by Skybox Imaging, which Google acquired in August 2014.[12][14][15] However, by the following year, sources put the satellites nearer 175–200 kg (386–441 lb) in mass.[10][16]

In March 2015, OneWeb indicated that they intended to select a launch service provider by mid-2015[10] and in June 2015 announced that Arianespace is contracted to provide 21 multi-sat launches on Soyuz beginning in 2017 with Virgin Galactic under contract to provide 39 single-sat launches using its LauncherOne smallsat launch vehicle.[17][18] There is also an option to use Ariane 6 for up to three launches after 2021, making this the first contract announced for the Ariane launch vehicle.[16][19][20]

By June 2015, the company modified their plan somewhat to orbit a total constellation of 720 satellites, operating in low Earth orbit at 1,200 kilometres (750 mi) altitude,[16] which plan was somewhat reduced by early 2016 with only 640 satellites planned, but still at 1200 km.[2]

In June 2015, it was announced that Airbus Defence and Space was selected to build the satellites.[21][22]

Design characteristics

The satellites for the OneWeb constellation are reportedly 175–200 kg (386–441 lb) in mass.[10][16] The 720 operational satellites will orbit in 20 different orbital planes at 1,200 kilometres (750 mi) altitude.[16][23]

The satellites will operate in the Ku band, communicating in the microwave range of frequencies in the 12–18 GHz portion of the electromagnetic spectrum.[1][12] Each satellite will be capable of generating 6 gigabits per second of throughput.[10] The antenna on each smallsat will be a phased array antenna measuring approximately 36 by 16 centimeters (14.2 by 6.3 in) and will provide Internet access at 50 megabits/second. It will use a technique called “progressive pitch” in which the satellites are slightly turned to avoid interference with Ku-band satellites in geostationary orbit.[12]

The satellites will be designed to comply with "orbital debris-mitigation guidelines for removing satellites from orbit and, for low-orbit satellites, assuring that they reenter the Earth’s atmosphere within 25 years of retirement."[22]

Manufacturing and constellation rollout

The initial operational constellation was originally (June 2014) planned to be just half of the total of 720 satellites. A quarter of the satellites will make up the initial constellation, and these would operate in the lower of the two proposed orbits, at approximately 850 kilometres (530 mi).[4] The initial constellation would presumably be raised or lowered into its final orbital altitude of either 800 kilometres (500 mi) or 950 kilometres (590 mi) as consumer and business use of the broadband service grows over time.[1] By early 2015, OneWeb indicated that the first launches will occur no earlier than 2017.[12]

In February 2016, OneWeb announced that they would set up an assembly and test facility in Florida. They plan to assemble and launch more than 640 satellites by the end of 2019, but will manufacture an additional 250 of the 140-kilogram-satellites (300 lb) as spares to be used in later years.[2]

Concerns

End-of-life concerns

With such a large number of satellites being added to the already crowded low Earth orbit, plans for handling the satellites once the operational life of each satellite is completed are an important consideration. The region between 600 and 1,000 kilometres (370 and 620 mi) is already the most congested orbital regime around Earth, and concerns about adding to the existing space debris problem have been expressed.[4] There could be a new regime of graveyard orbits added, similar to those in use for decades to handle post-operational commsats that operated in the geostationary belt; however at the orbital altitudes envisioned for WorldVu, the disposal orbit may not have a sufficiently long life to assure long-term stability.

An alternative that has been proposed for years is to introduce the capability to retrieve derelict objects for near-space clean up and then either deorbit the satellite or do some sort of in-space recycling of the satellite materials. Several technical approaches have been proposed, but there has been no legal framework to date that has required satellite operators to clean up their derelict satellites. New approaches offer the technical prospect of markedly reducing the cost of object capture and deorbit with the implementation of a one-up/one-down launch license regime to Earth orbits that would require satellite operators to remove one spacecraft for each one deployed.[24]

Interference with other Earth-bound transceivers

OneWeb competitor, satellite fleet operator ABS, has expressed concerns about the amount of electromagnetic interference that the OneWeb constellation could add to existing terrestrial transceivers.[25]

Competition

Competition to WorldVu for producing smaller and lower-cost satellites in general is thought to come "from other makers of small satellites, such as Nevada-based Sierra Nevada Corp. and Britain’s Surrey Satellite Technology Ltd."[7] In broadband internet service provision more specifically, there are a large number of alternatives to the proposed WorldVu satellite broadband service, mostly involving wired and terrestrial radio broadband service.

Other potential competitors in the satellite internet space are the SpaceX satellite constellation and a 2015 proposal from Samsung outlining a 4600-satellite constellation orbiting at 1,400 kilometers (900 mi) that could bring 200 gigabytes per month of internet data to "each of the world's 5 billion people".[26][27]

One advantage OneWeb will have is that, as of January 2015, no other competitor has obtained a license from the International Telecommunications Union to operate a Ku-band satellite network that is not placed in a geosynchronous orbit.[12]

Historically, earlier companies that have attempted to build satellite internet service networks and provide space-based internet connections have not fared well, as both services were hobbled by high costs which consequently attracted few users. Iridium SSC filed for bankruptcy protection in 1999 and Globalstar did the same in 2002.[7]

See also

References

  1. 1 2 3 4 5 6 de Selding, Peter B. (2014-05-30). "Google-backed Global Broadband Venture Secures Spectrum for Satellite Network". SpaceNews. Retrieved 2014-06-14.
  2. 1 2 3 "OneWeb Satellite Startup to Set up Manufacturing in Florida". Wall Street Journal. 2016-01-03. Retrieved 2016-02-04.
  3. ↑ Messier, Doug (2014-02-16). "Is Google Planning Son of Teledesic?". Parabolic Arc. Retrieved 2014-06-14.
  4. 1 2 3 Boucher, Marc (2014-06-03). "Will Google Build a Satellite Constellation?". SpacRef Business. Retrieved 2014-06-14.
  5. ↑ "Google Satellite Employee Greg Wyler Leaves Company". Wall Street Journal. 2014-08-02. Retrieved 2014-08-03. (subscription required (help)). A key employee leading Google Inc.'s efforts to beam Internet access from satellites has left the company and is now working closely with Space Exploration Technologies Corp. and its founder Elon Musk, according to people familiar with the matter. ... It isn't clear why the WorldVu team departed Google.
  6. ↑ "WorldVu, a Satellite Startup Aiming To Provide Global Internet Connectivity, Continues To Grow Absent Clear Google Relationship". Space News. 2014-08-03. Retrieved 2014-08-03.
  7. 1 2 3 4 Winkler, Rolfe; Pasztor, Andy (2014-11-07). "Elon Musk’s Next Mission: Internet Satellites SpaceX, Tesla Founder Explores Venture to Make Lighter, Cheaper Satellites". Wall Street Journal. Retrieved 2014-11-09.
  8. ↑ Messier, Doug (2014-11-11). "WorldVu Satellites Issues RFP for 640 Satellites". Parabolic Arc. Retrieved 2014-11-15.
  9. ↑ Rolfe Winkler, "Elon Musk Confirms SpaceX Is Building Internet Satellites", Wall Street Journal, 11/11/2014
  10. 1 2 3 4 5 6 de Selding, Peter B. (2015-03-19). "Competition To Build OneWeb Constellation Draws 2 U.S., 3 European Companies". Space News. Retrieved 20 March 2015.
  11. ↑ Winkler, Rolfe (2015-01-14). "Greg Wyler’s OneWeb Satellite-Internet Company Secures Funding". Wall Street Journal. Retrieved 2015-01-15.
  12. 1 2 3 4 5 6 de Selding, Peter B. (15 January 2015). "Virgin, Qualcomm Invest in OneWeb Satellite Internet Venture". SpaceNews. Retrieved 16 January 2015.
  13. ↑ Petersen, Melody (16 January 2015). "Elon Musk and Richard Branson invest in satellite-Internet ventures". Los Angeles Times. Retrieved 19 January 2015.
  14. ↑ "Skybox Imaging + Google" (Press release). Skybox Imaging. 2014-08-01. Retrieved 2014-11-12.
  15. ↑ Clark, Stephen (2014-06-10). "Google buys startup Skybox Imaging for $500 million". Spaceflight Now. Retrieved 2014-06-15.
  16. 1 2 3 4 5 "OneWeb satellite operator eyes huge rocket campaign". BBC. 25 June 2015. Retrieved 25 June 2015.
  17. ↑ "Virgin Galactic Signs Contract with OneWeb to Perform 39 Satellite Launches" (Press release). Long Beach, California: Virgin Galactic. 25 June 2015. Retrieved 25 June 2015.
  18. ↑ Burn-Callander, Rebecca (22 August 2015). "Virgin Galactic boldly goes into small satellites, telling future astronauts 'you have to wait'". UK Telegraph. Retrieved 2015-08-24.
  19. ↑ "OneWeb signs agreement with Arianespace for the deployment of the OneWeb Constellation" (Press release). Evry: Arianespace. 25 June 2015. Retrieved 25 June 2015.
  20. ↑ "OneWeb takes pole-position in global satellite Internet race". Space Digest. 25 June 2015. Retrieved 25 June 2015. Stéphane Israël, Chairman and CEO of Arianespace, noted that this was the first order for new European Ariane 6 launcher.
  21. ↑ "OneWeb selects Airbus to build 900 Internet satellites". spaceflightnow.com. Retrieved 16 June 2015.
  22. 1 2 "OneWeb Taps Airbus To Build 900 Internet Smallsats". SpaceNews. 2015-06-15. Retrieved 19 June 2015.
  23. ↑ http://spacenews.com/in-conversation-with-oneweb-founder-greg-wyler/
  24. ↑ Zegler, Frank; Bernard Kutter (2010-09-02). "Evolving to a Depot-Based Space Transportation Architecture" (PDF). AIAA SPACE 2010 Conference & Exposition. AIAA. pp. 13–14. Retrieved 2014-06-14. for disposing of these obsolete or derelict spacecraft all [approaches] involve the expenditure of substantially more delta V than what has been traditional. It may well be required that old spacecraft be removed at the same time new spacecraft are being emplaced. ... [this architecture] anticipates the task of removing derelict spacecraft by providing an infrastructure to permit these high ΔV missions and enables the likely new paradigm of removing a spacecraft for each one deployed.
  25. ↑ OneWeb Gets (Slide) Decked by Competitor at CASBAA, SpaceNews, 28 October 2015, accessed 2015-10-29.
  26. ↑ Gershgorn, Dave (2015-08-17). "Samsung Wants To Blanket The Earth In Satellite Internet". Popular Science. Retrieved 2015-08-21.
  27. ↑ Khan, Farooq (2015). "Mobile Internet from the Heavens" (PDF). arxiv.org. Retrieved 2015-08-21.

External links

This article is issued from Wikipedia - version of the Tuesday, April 19, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.