| 词条 | KA-SAT |
| 释义 |
| name = KA-SAT | image = KA-SAT artist view.png | image_caption = Artist rendering of the KA-SAT satellite | mission_type = Communication | operator = Eutelsat | website = | COSPAR_ID = | SATCAT = | mission_duration = | spacecraft_bus = Eurostar E3000 | manufacturer = EADS Astrium | dry_mass = | launch_mass = {{convert|6150|kg|lbs}} | power = | launch_date = {{start-date|26 December 2010}} | launch_rocket = Proton-M/Briz-M | launch_site = Baikonur 200/39 | launch_contractor = ILS[1] | entered_service = | disposal_type = | deactivated = | orbit_epoch = | orbit_reference = Geocentric | orbit_regime = Geostationary | orbit_periapsis = | orbit_apoapsis = | orbit_inclination = | orbit_period = | orbit_longitude = | orbit_slot = | apsis = gee | trans_band = | trans_frequency = | trans_bandwidth = | trans_capacity = | trans_coverage = | trans_TWTA = | trans_EIRP = | trans_HPBW = }} KA-SAT is a high-throughput telecommunications satellite owned by Eutelsat. The satellite provides broadband Internet access services across Europe and also a small area of the Middle East[2], and additionally the Saorsat TV service to Ireland. It is positioned at 9°E,[2] joining the Eurobird 9A Ku band satellite. KA-SAT was manufactured by EADS Astrium, based on the Eurostar E3000 platform, with a total weight of 6 tons.[1] It was launched by Proton in December 2010.[3] The satellite is named after the Ka band frequency, which is used on the spacecraft. SpacecraftThe spacecraft is equipped with four multi-feed deployable antennas with enhanced pointing accuracy and a high-efficiency repeater{{Citation needed|date=December 2010}}. It is configured with 82 spotbeams,[3] making it the most advanced multi-spot satellite designed in the world to date{{Citation needed|date=December 2010}}. Each spotbeam is associated with a 237 MHz wide transponder, allowing a data bit rate throughput of 475 Mbit/s per spot. The spacecraft power is about 14 kW and the payload DC power is 11 kW. The solar array power provides up to 16 kW. The payload mass is about 1000 kg, the dry mass is about 3170 kg, the launch mass was 6100 kg. The manoeuvre lifetime in orbit is estimated to 16 years. Broadband Internet access serviceAccording to Eutelsat, KA-SAT will be able to provide broadband Internet access to potentially more than one million homes. The company invested about €350 million in the program, including the satellite manufacturing and launch. KA-SAT features a high level of frequency reuse enabling the system to achieve a total capacity of more than 90 Gbit/s.[4][5] The introduction of KA-SAT has tripled the total capacity commercialized by Eutelsat{{Citation needed|date=December 2010}}. The satellite operates in conjunction with ten terrestrial teleports (two of them as a backup) providing Internet gateway services, parts of the Eutelsat's Tooway service{{Citation needed|date=December 2010}}, all of them linked by the "KA-SAT ring", a terrestrial telecommunication high-speed network. The service is centrally operated from Skylogic's NOC based in Torino (Italy) (Skylogic is a subsidiary of Eutelsat). Communication systemsThe data communications used on the KA-SAT satellite are transmitted to and from equipment manufactured by ViaSat:
"SurfBeam 2" is a modified version of the DOCSIS protocol adapted by ViaSat Inc. for the satellite physical link. References1. ^1 {{cite web |url=http://www.ilslaunch.com/assets/pdf/KA-SAT%20Mission%20Overview%20final.pdf |title=KA-SAT Mission Overview |publisher=International Launch Services |archiveurl=https://www.webcitation.org/5vI9KSD8A?url=http://www.ilslaunch.com/assets/pdf/KA-SAT%20Mission%20Overview%20final.pdf |archivedate=27 December 2010 |deadurl=yes |df= }} 2. ^{{cite news|url=http://news.xinhuanet.com/english2010/sci/2010-12/27/c_13666427.htm|title=Russia puts European satellite into orbit|date=27 December 2010|author=Yang Lina|publisher=Xinhua News Agency|deadurl=yes|archiveurl=https://web.archive.org/web/20101230132647/http://news.xinhuanet.com/english2010/sci/2010-12/27/c_13666427.htm|archivedate=30 December 2010|df=}} 3. ^1 2 {{cite news|url=https://www.bbc.co.uk/news/science-environment-12065466|title=Ka-Sat net-dedicated spacecraft lifts off|author=Jonathan Amos|publisher=BBC News|date=26 December 2010}} 4. ^{{cite press release|first=|last=|author=|authorlink=|title=Eutelsat to Drive Satellite Broadband to New Frontiers with First Full Ka-Band Satellite Infrastructure|url=http://www.eutelsat.com/news/compress/en/2008/pdf/PR0108-KaSat.pdf|work=|publisher=Eutelsat|location=|page=|pages=|language=|format=PDF|doi=|date=7 January 2008|year=|accessdate=29 May 2009|quote=}} 5. ^http://www.eutelsat.com/en/satellites/the-fleet/EUTELSAT-KA-SAT-characteristics.html External links{{Portal|Spaceflight}}{{Commons category|KA-SAT}}
5 : Communications satellites in geostationary orbit|Spacecraft launched in 2010|High throughput satellites|Satellites using the Eurostar bus|Eutelsat satellites |
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