Английская Википедия:BSAT-1b
BSAT-1b was a geostationary communications satellite designed and manufactured by Hughes (now Boeing) on the HS-376 platform. It was originally ordered and operated by the Broadcasting Satellite System Corporation (B-SAT). It was used as backup of BSAT-1a to broadcast television channels for NHK and WOWOW over Japan. It had a pure Ku band payload and operated on the 110°E longitude until it was replaced, along its twin BSAT-1a, by BSAT-3a.[1][2][3][4]
Satellite description
The spacecraft was designed and manufactured by Hughes on the HS-376 satellite bus. This spin-stabilized platform had two main sections. One, the spinning section, was kept rotating at 50 rpm to maintain attitude, and a despun section that was used by the payload to maintain radio coverage. The spinning section included the Star-30BP Apogee kick motor, most of the attitude control, the power subsystem and the command and telemetry subsystems. The despun section contained the communications payload, including the antennas and transponders.[1][5]
It had a launch mass of Шаблон:Convert, a mass of Шаблон:Convert after reaching geostationary orbit and a 10-year design life. When stowed for launch, its dimensions were Шаблон:Convert long and Шаблон:Convert in diameter. With its solar panels fully extended it spanned Шаблон:Convert.[1] Its power system generated approximately 1,200 Watts of power thanks to two cylindrical solar panels.[5] It also had a NiH2 batteries for surviving solar eclipses.[1] It would serve along BSAT-1a on the 110°E longitude position for the B-SAT.[5]
Its payload was composed of a four active plus four spares Ku band transponders fed by a TWTA with an output power of 106 Watts. Its footprint covered Japan and its surrounding island.[1]
History
Broadcasting Satellite System Corporation (B-SAT) was founded in 1993 to broadcast by satellite the analog signals of NHK and WOWOW, including analog high definition Hi-Vision channels.[3] In June 1994, it orders two HS-376 satellite from Hughes (now Boeing), BSAT-1a and BSAT-1b.[1]
During 1997 B-SAT completed its Kawaguchi and Kimitsu satellite control centers, launched and commissioned BSAT-1a.[2] At 22:53 UTC, April 28, 1998, the Ariane-44P flight V-108 successfully launched BSAT-1b, along Nilesat 101, from Kourou ELA-2 launch pad.[6][5]
On August 1, 1998, BSAT-1b entered into commercial service. In December 2000, due to launch delays of BSAT-2a, BSAT-1b started digital broadcasting services for B-SAT.[2]
During May 2005, B-SAT ordered BSAT-3a, the replacement satellite for BSAT-1a and BSAT-1b. It was successfully launched in August 2007, and accepted into the fleet the next month. During November, 2007 BSAT-3a took over the broadcasting of analog and digital signals from BSAT-1a and BSAT-1b. In August 2011, BSAT-1b was placed in a graveyard orbit and decommissioned.[2][7]
References
Шаблон:Portal Шаблон:BSAT satellites Шаблон:Orbital launches in 1998
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- Английская Википедия
- Communications satellites in geostationary orbit
- Spacecraft launched in 1998
- Satellites using the HS-376 bus
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