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Q/V band communication and propagation - The communication bands commonly used by telecommunications companies are becoming crowded and so to increase capacity new bandwidths need to be exploited. Parallel Ka and Q band transmitters will develop the understanding of how the Earth's atmosphere affects
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In order to cover the mission range in an optimised way, the platform product line includes several options such as electric propulsion, and features scalable resources (solar array, radiators for thermal dissipation, etc.). The platform will be able to accommodate up to 190 high power transponders
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Environmental
Testing and Radiation Sensor - Will supply data to provide a more detailed understanding of the radiation environment at geostationary orbit. The data will not only provide Immersat information for operating Alphasat over its lifetime but also inform future satellite designs. This
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Optical communications and Ka band downlink - This module tests a new laser based communication system which can offer significantly higher data transfer rates than traditional methods (2.8 Gbit/s). This trial module will take data from a satellite in
434:. The three-day trip used an exceptional convoy made up of a 20 m-long lorry carrying the satellite container, several escort cars and a police escort to close off streets and redirect traffic as they passed through urban areas.
218:
The
Alphabus platform is designed for communications satellites with payload power in the range 12-18 kW. Satellites based on Alphabus will have a launch mass in the range 6 to 8 tonnes, 40% more than the most powerful
235:
Development of the new satellite, made in cooperation between the two large
European satellite manufacturers, take into account the best lessons learned from previous incarnations of similar satellites: the
252:
Structure is based on a central tube (the vertebral column of the satellite), like the
Spacebus design, with additional carbon and aluminium panels (Section 2800 mm x 2490 mm, Launcher Interface:
445:(Inmarsat 4A F4) was launched on 25 July 2013 from French Guiana by early August it had reached a holding position in geostationary orbit and had successfully deployed its solar arrays and 11-metre
344:(BGAN) service supporting a new generation of mobile technologies and enable communications across Europe, Asia, Africa and the Middle East. Alphasat was partially funded by
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Payload allowing for a modular-concept-based setup, comprising an antenna module for easier antenna accommodation and efficient assembly and testing.
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and large antenna farms, and will have a significant growth potential (22 kW payload power and 9 tonnes launch mass for the extended range).
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Active pixel startracker - Startrackers are vital to ensure satellites remain in the desired orbit, this startracker is based on an
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design and boasts good radiation resilience, small size and low power consumption. This module was built by Jena-Optronik
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Michel LYSZYK1; Pierre-Philippe BAUBIAS; Anthony NAULIN; Ronan PIN; Laurent LECARDONNEL (September 15, 2011).
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Power generation and distribution offering both 100 V and 50 V regulated buses, accommodating two
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The first service module of the new
Alphabus completed its first journey at the end of January 2010 – from
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communication at these wavelengths. This TDP was built by Space
Engineering and Thales Alenia Space -
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As well as its primary objective of providing in orbit validation of the
Alphabus platform,
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traditional communication equipment to a ground station. The system is a test for ESA's
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which is currently in development. The module was built by TESAT
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567:"Inmarsat and Astrium sign Alphasat I-XL satellite contract"
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for a first use of such a platform. The satellite is named
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1/10th scale mockup of
Alphasat in Le Bourget Airshow 2013
207:, with support of the Centre national d'études spatiales (
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thrusters with thruster orientation (pointing) mechanisms
300:(ADCS) with Gyros, Star and Sun Sensors, Reaction Wheels
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Spacebus 4000 platform, a Thales Alenia Space document
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Full scale mockup
Alphasat at Le Bourget Airshow 2013
303:Data Handling accommodating a 1553-bus for payload
532:32nd International Electric Propulsion Conference
472:. Thales Alenia Space. 2007-11-23. Archived from
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661:"Alphasat deploys its giant reflector in orbit"
340:(Inmarsat 4A F4), and will augment Inmarsat's
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733:Alphasat on EADS Astrium Satellites web site
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551:: CS1 maint: numeric names: authors list (
506:"AlphaBus: An Extended European Capability"
525:"XPS Plasma Propulsion System on AlphaBus"
22:
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259:with a 500 N Apogee Engine and 16 x 10 N
240:and Eurostar families, respectively from
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291:wings with 4 to 6 panels ; modular
263:; Propellant tanks (Max 4200 kg of
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384:under a co-contractorship arrangement.
348:and UK Regional Development Agencies.
470:"Alphabus development well under way"
195:developed by a joint venture between
589:"Cutting edge telecoms sat launches"
211:), the French space agency and the
191:is a family of heavy geostationary
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508:. ESA. 3 July 2009. Archived from
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771:
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362:technology demonstration payloads
267:) and Helium tanks (2x150 litres)
569:. spaceref.com. 23 November 2007
91:6,550 kilograms (14,440 lb)
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277:tanks (Max 350 kg) ;
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649:Ariane 5 successfully delivers
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342:Broadband Global Area Network
728:Thales Alenia Space web site
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638:First journey for Alphabus
418:First journey for Alphabus
408:European Data Relay System
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298:Attitude and Orbit Control
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311:Alphasat (Inmarsat-4A F4)
193:communications satellites
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743:Astro Aerospace web site
66:Communications satellite
690:EADS Astrium Satellites
334:EADS Astrium Satellites
246:EADS Astrium Satellites
201:EADS Astrium Satellites
46:EADS Astrium Satellites
352:Demonstration Payloads
332:awarded a contract to
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456:Footnotes and Sources
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271:Electrical propulsion
213:European Space Agency
512:on 23 December 2009.
402:and transmit it via
369:module was built by
700:Thales Alenia Space
614:"Alphasat Brochure"
293:Lithium-ion battery
257:Chemical propulsion
242:Thales Alenia Space
197:Thales Alenia Space
42:Thales Alenia Space
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724:– official website
360:also carries four
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738:Inmarsat web site
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52:Country of origin
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99:up to 22 kW
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760:Satellite buses
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667:. 5 August 2013
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706:External links
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315:Main article:
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83:Specifications
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142:In production
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117:15 years
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108:Geostationary
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547:cite journal
535:. Retrieved
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510:the original
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478:. Retrieved
474:the original
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389:active pixel
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265:bipropellant
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231:Product line
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178:25 July 2013
62:Applications
38:Manufacturer
712:flashespace
452:reflector.
289:solar array
163:Operational
114:Design life
88:Launch mass
722:ESA Portal
573:21 January
480:2008-02-05
404:Alphasat's
134:Production
450:AstroMesh
261:thrusters
754:Category
695:Inmarsat
684:See also
671:7 August
443:Alphasat
428:Toulouse
375:Portugal
364:(TDPs):
358:Alphasat
338:Alphasat
330:Inmarsat
317:Alphasat
279:PPS 1350
238:Spacebus
221:Spacebus
189:Alphabus
155:Launched
17:Alphabus
623:29 July
598:29 July
412:Germany
393:Germany
215:(ESA).
537:May 1,
447:L-band
438:Launch
432:France
424:Cannes
371:EFACEC
223:4000.
205:France
139:Status
104:Regime
56:Europe
528:(PDF)
430:, in
382:Italy
275:Xenon
273:with
147:Built
96:Power
673:2013
625:2013
600:2013
575:2023
553:link
539:2023
286:GaAs
244:and
209:CNES
199:and
665:ESA
618:ESA
593:BBC
426:to
400:LEO
373:in
346:ESA
203:in
69:bus
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549:}}
545:{{
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