cosmos.wikisort.org - Spacecraft

KA-SAT is a high-throughput telecommunications satellite owned by Viasat. 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,[3] joining the Eurobird 9A K_u 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.[2] The satellite is named after the K_a band frequency, which is used on the spacecraft.

KA-SAT

Artist rendering of the KA-SAT satellite
Mission type	Communication
Operator	Viasat
COSPAR ID	2010-069A
SATCAT no.	37258
Spacecraft properties
Bus	Eurostar E3000
Manufacturer	EADS Astrium
Launch mass	6,150 kilograms (13,560 lb)
Start of mission
Launch date	26 December 2010 (2010-12-26)
Rocket	Proton-M/Briz-M
Launch site	Baikonur 200/39
Contractor	ILS[1]
Orbital parameters
Reference system	Geocentric
Regime	Geostationary

In November 2020, Viasat purchased Eutelsat's share of Euro Broadband Infrastructure (EBI) for $166 million (140 million euro), giving Viasat total ownership of the KA-SAT satellite and related ground infrastructure. The purchase was completed on April 30, 2021.[4]

Spacecraft

The spacecraft is equipped with four multi-feed deployable antennas with enhanced pointing accuracy and a high-efficiency repeater^{[citation needed]}. It is configured with 82 spotbeams.[2] 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 service

KA-SAT features a high level of frequency reuse enabling the system to achieve a total capacity of more than 90 Gbit/s.[5][6]

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]}, 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). In February 2022 the service experienced interruptions.[7]

Communication systems

The data communications used on the KA-SAT satellite are transmitted to and from equipment manufactured by ViaSat:

• in the Eutelsat's teleports (Internet gateways), the ViaSat "SurfBeam 2" hub system;
• at the customer site, the ViaSat "SurfBeam 2" modem as a customer-premises equipment.

"SurfBeam 2" is a modified version of the DOCSIS protocol adapted by ViaSat Inc. for the satellite physical link.

Satellite television

KA-SAT carries the Irish Saorsat[8] TV service accessed using a KA-Band feedhorn LNBF, for areas in Ireland where Irish Digital Terrestrial TV (Saorview) is inaccessible.[9]

Outages

Since 24 February 2022, about the start of the 2022 Russian invasion of Ukraine, the ViaSat Internet service has suffered disruptions over some parts of Europe.[10]

According to Michel Friedling, Commander of the French Space Command, and Viasat itself, the disruptions were caused by a cyberattack.[11][12]

References

External links

• Eutelsat page for KA-SAT

На других языках

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[de] Eutelsat KA-SAT 9A

KA-SAT 9A ist ein kommerzieller Kommunikationssatellit des US-amerikanischen Unternehmens Viasat Inc., der von der geostationären Position 9° Ost im Ka-Band Breitbandinternet für Europa und den Nahen Osten bereitstellt. Zur besseren Frequenznutzung seiner 237-MHz-Transponder bedient er sich 82 über Europa verteilter Spotbeams, jeder davon mit einer Kapazität von 475 Mb/s.

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- [en] KA-SAT

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[ru] Ka-Sat

KA-SAT — телекоммуникационный спутник связи высокой пропускной способности, принадлежащий компании Eutelsat. Спутник обеспечивает услугами широкополосного доступа в Интернет Европу, а также небольшую часть Ближнего Востока. Он расположен на 9° в. д.[1], примыкая к спутнику Eurobird 9A Ku-диапазона. KA-SAT был изготовлен компанией EADS Astrium на основе платформы Eurostar E3000, общим весом 6 тонн. Он был запущен ракета-носителем «Протон-М» в декабре 2010 года[2]. Спутник назван по диапазону частот Ka-, использованному на космическом аппарате.

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