Английская Википедия:GEOStar-2

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Шаблон:About

The STAR-2 Bus is a fully redundant, flight-proven, spacecraft bus designed for geosynchronous missions.

It is a satellite platform, designed and developed by Thomas van der Heyden for the Indonesian Cakrawarta satellite program in the early 1990s, now manufactured by Northrop Grumman Innovation Systems with an apogee kick motor to place a communications satellite into geostationary orbit, a thruster to provide the satellite with orbital station-keeping for a 15-year mission, and solar arrays to provide the satellite payload with 5 kW of electrical power.[1]

Advantages

NGIS's GEOStar-2 bus design is unique within the satellite industry. NGIS's GEOStar-2 bus provides an affordable low-to-medium power satellite platform that is ideal for missions of this size. Rather than being a less efficient version of a larger, heavier product, NGIS's GEOStar-2 bus is designed specifically for the 1000 to 5550 watts payload class.[1]

Design

The GEOStar-2 bus satellite is a modular, mass efficient structure, designed for simplified integration to reduce manufacturing cycle times. The structure is supported by a composite thrust cylinder, to which the bus, payload, nadir and base panels are connected. Energy from two multi-panel solar wings and lithium-ion batteries is electronically processed to provide 36 volts regulated power to the satellite throughout the mission. All active units aboard the satellite are connected through a 1553 data bus. Commands and telemetry are processed through the flight software resident on the flight processor, which provides robust autonomous control to all GEOStar-2 satellites. The modularity of the structure and the standard 1553 interfaces allow parallel assembly and test of the bus and payload systems, reducing manufacturing schedule risk by minimizing the time spent in serial satellite integration and test flow.[1] GEOStar-2 is designed for missions up to 15 years in duration. The propulsion system is sized for ten years of station keeping in geosynchronous orbit. Built-in radiation hardness for the severe geosynchronous environment is achieved through conservative selection of electronic parts.[2] Several available options augment the basic bus to provide improved pointing, more payload power, secure communications, higher downlink data rates or enhanced payload computing power.

Structure

  • Bus Dimensions (H x W x L): 1.75 x 1.7 x 1.8 m
  • Construction: Composite/Al [1]

Power subsystem

  • Payload Power: Up to 5550 watts orbit average at 15 years
  • Bus Voltage: 24-36 VDC (nominal)
  • Solar Arrays: multi-junction GaAs cells
  • Batteries: lithium-ion[1]

Attitude control subsystem

Command and data handling subsystem

  • Flight Processor: MIL-STD-1750A
  • Interface Architecture: MIL-STD 1553B, CCSDS [1]

Payload support

While primary applications are Fixed-Satellite Services (FSS) and Broadcast Satellite Services (BSS), the GEOStar-2 bus can be adapted for MSS, Earth and space science applications, as well as for technology demonstration or risk reduction programs. Depending on mission duration requirements, the GEOStar-2 bus can accommodate payloads in excess of 500 kilograms, and provide up to 5550 watts of power. Instrument data can be provided in standard format such as CCSDS or through secured encryption, as approved by the National Security Agency (NSA).[1]

Shared launch opportunities

Due to the size and mass envelope of the satellite, the GEOStar-2 bus is compatible with almost all commercially available launch vehicles, maximizing opportunity for launch and access to space. While dedicated or single launch services are more readily available, the GEOStar-2 bus targets shared launch opportunities, where launch cost and launch-sharing opportunities are favorable.[1]

Mission services

Customers can purchase the GEOStar-2 bus spacecraft bus alone, or as part of a turn-key service that includes an integrated payload, network operations center and launch vehicle. NGIS conducts spacecraft commissioning from its own ground station prior to transferring spacecraft control to the customer's operations center.[1]

Satellite Orders

Satellite Country Operator Type Transponders Launch date (UTC) Rocket Changes Status
AMC-21 United States SES Americom Television broadcasting 24 Ku-band Шаблон:Nowrap Ariane 5 ECA Active
Amazonas 4A Spain Hispasat Communications 24 Ku-band Шаблон:Nowrap Ariane 5 ECA Active
Azerspace-1/Africasat-1a Azerbaijan Azercosmos Communications 24 C-band, 12 Ku-band Шаблон:Nowrap Ariane 5 ECA Active
Eutelsat 5 West B International Eutelsat Communications 35 Ku-band Шаблон:Nowrap Proton-M
Phase 4 		Active
Galaxy 12 United States PanAmSat Television broadcasting 20-24 C-band Шаблон:Nowrap Ariane 5 G Active
Galaxy 14 United States PanAmSat Television broadcasting 20-24 C-band Шаблон:Nowrap Soyuz-FG Active
Galaxy 15 United States PanAmSat Television broadcasting 20-24 C-band Шаблон:Nowrap Ariane 5 GS Active
Galaxy 30 United States Intelsat Television broadcasting C-band, Ku-band, Ka-band,
and WAAS payload 		Шаблон:Nowrap Ariane 5 ECA Active
Horizons-2 United States, Japan PanAmSat, SKY Perfect JSAT Communications 20 Ku-band Шаблон:Nowrap Ariane 5 GS Active
HYLAS 2 United Kingdom Avanti Communications Satellite internet 24 Ka-band Шаблон:Nowrap Ariane 5 ECA Active
Intelsat 11 United States Intelsat Communications 16 C-band, 18 Ka-band Шаблон:Nowrap Ariane 5 GS Formerly PAS 11 Active
Intelsat 15 United States Intelsat Communications 22 Ku-band Шаблон:Nowrap Zenit-3SLB Active
Intelsat 16 United States Intelsat Communications 24 Ku-band Шаблон:Nowrap Proton-M
Phase 1 		Formerly PAS 11R Active
Intelsat 18 United States Intelsat Communications 24 C-band, 12 Ku-band Шаблон:Nowrap Zenit-3SLB Active
Intelsat 23 United States Intelsat Communications 24 C-band, 15 Ku-band Шаблон:Nowrap Proton-M
Phase 3 		Active
Koreasat 6 South Korea KT Corporation Television broadcasting 30 Ku-band Шаблон:Nowrap Ariane 5 ECA Active
MEASAT-3a Malaysia MEASAT Satellite Systems Television broadcasting 12 C-band, 12 Ku-band Шаблон:Nowrap Zenit-3SLB Active
Mexsat-3 Mexico Mexican Satellite System Mobile communications 12 C-band, 12 Ku-band Шаблон:Nowrap Ariane 5 ECA Active
N-STAR c Japan NTT Docomo Mobile communications 1 C-band, 20 S-band Шаблон:Nowrap Ariane 5 G Retired
New Dawn United States Intelsat Television broadcasting 28 C-band, 24 Ku-band Шаблон:Nowrap Ariane 5 ECA Known as Intelsat 28 Active
NSS-9 Netherlands SES World Skies Communications 28 C-band Шаблон:Nowrap Ariane 5 ECA Active
Optus D1 Australia Optus Television broadcasting 24 Ku-band Шаблон:Nowrap Ariane 5 ECA Active
Optus D2 Australia Optus Television broadcasting 24 Ku-band Шаблон:Nowrap Ariane 5 GS Active
Optus D3 Australia Optus Television broadcasting 24 Ku-band Шаблон:Nowrap Ariane 5 ECA Active
SES-1 United States SES Americom Communications 24 C-band, 24 Ku-band, 2 Ka-band Шаблон:Nowrap Proton-M
Phase 2 		Formerly AMC-4R Active
SES-2 and CHIRP
(Commercially Hosted InfraRed Payload) 		United States SES Americom Communications 24 C-band, 24 Ku-band, 2 Ka-band Шаблон:Nowrap Ariane 5 ECA Formerly AMC-5R Active
SES-3 United States SES Americom Communications 24 C-band, 24 Ku-band, 2 Ka-band Шаблон:Nowrap Proton-M
Phase 3 		Active
SES-8 Luxembourg SES S.A. Television broadcasting 33 Ku-band Шаблон:Nowrap Falcon 9 Active
Sky-Mexico 1 Mexico DirecTV Television broadcasting 24 Ku-band, 2 R-band Шаблон:Nowrap Ariane 5 ECA Known as SKYM 1 Active
Star One C3 Brazil Star One Communications 28 C-band, 16 Ku-band Шаблон:Nowrap Ariane 5 ECA Active
Telkom-2 Indonesia Telkom Indonesia Communications 24 C-band Шаблон:Nowrap Ariane 5 ECA Retired
Thaicom 6 Thailand Thaicom Communications 24 C-band, 9 Ku-band Шаблон:Nowrap Falcon 9 Known as AfriCom 1 Active
Thaicom 8 Thailand Thaicom Communications 24 Ku-band Шаблон:Nowrap Falcon 9 Active
Thor 5 Norway Telenor Television broadcasting 24 Ku-band Шаблон:Nowrap Proton-M
Phase 3 		Active

See also

Шаблон:Portal

References

Шаблон:Reflist

Партнерские ресурсы
Криптовалюты
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Разное

  1. ↑ 1,0 1,1 1,2 1,3 1,4 1,5 1,6 1,7 1,8 1,9 Шаблон:Cite web
  2. ↑ Шаблон:Cite web
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