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DFH-3

DFH-3

DFH-3

Chinese satellite bus used for geosynchronous communications and navigation satellites and deep space probes. Total mass, payload mass, and payload power improved through three versions from 2320 kg to 3800 kg; 230 kg to 450 kg; and 1000 W to 4000 W.

AKA: Dong Fang Hong;KF;Kua Fu. Status: Operational 1994. First Launch: 1994-02-08. Last Launch: 2012-07-25. Number: 16 . Gross mass: 2,230 kg (4,910 lb). Unfuelled mass: 1,130 kg (2,490 lb). Height: 1.70 m (5.50 ft). Span: 18.10 m (59.30 ft).

On-orbit mass was over one metric ton. The box-shaped satellite was equipped with two large solar panels and was 3-axis stabilized. The communications payload could consist of up to 24 6/4 GHz transponders and the design life was eight years.

The satellite was equipped with an FY-25 liquid propellant motor for apogee insertion and stationkeeping. The motor was rated for 1800 seconds total firing time. Technical assistance in overall system design and implementation was provided by MBB of Germany under a special contract. In August 2001 it was announced that China's first direct TV broadcasting satellite would be launched by 2004, and that it would use the DFH-3 bus. Three versions of the DFH-3 were developed over the years:

DFH-3 Bus


The DFH-3 was a 3-axis stabilized geosynchronous communications satellite bus. It could also be adapted for use in navigation satellites and deep space probes. It had a hexahedral structure, broken into three modules: propulsion, service and communication, communication antennas and solar arrays. There were seven subsystems: structure, control, power supply, TT&C, propulsion, thermal control and communication.

Technical Specifications

Dimensions: 2.20 m 1.72 m 2.00 m
Mass: 2320 kg
Payload capacity: 230 kg
Orbit type: GEO
Antenna pointing error: Pitch, Roll <=0.15 deg (3 sigma); Yaw <=0.5 deg (3 sigma)
Station keeping precision: +-0.1 deg (3 sigma)
Solar array output: 1700 W (EOL)
Payload power consumption: 1000 W
Lifetime: 8 years
First Flights: Communications: DFH-3(1997), Navigation: Beidou Navigation Satellites(2000,2003), Deep Space: Chang'e-1(2007)

DFH-3A Bus

DFH-3A was an updated version of DFH-3 bus, which boosted payload from 230 to 360 kg and payload power from 1000 W to 2500 W.


Technical Specifications
Dimensions: 2.40 m 1.72 m 2.20 m
Mass: 2740 kg
Payload bearing capacity: 360 kg
Orbit type:GEO and other orbits
Antenna pointing error: Pitch ,Roll <= 0.15 deg (3 sigma); Yaw <= 0.5 deg (3 sigma)
Station keeping precision: +- 0.1 deg (3 sigma)
Solar array output: 4000 W
Payload power consumption: 2500 W
Lifetime: 12 years
Applications: communications and navigation satellites; could be adapted for deep space probes.
First flight: Beidou navigation satellite (2007)
DFH-3B Bus
DFH-3B was further uprated version of the DFH-3 bus, with payload increased to 450 kg and payload power to 4000 W. Development began in 2008.

Technical Specifications<
> Dimensions:2.20 m 2.00 m 3.10 m
Mass: 3800 kg
Payload bearing capacity: 400-450 kg
Orbit type: GEO and other orbits
Antenna pointing error: Pitch ,Roll <= 0.06 deg (3 sigma); Yaw <= 0.2 deg (3 sigma)
Station keeping precision: +- 0.05 deg (3 sigma)
Solar array output: 5500 W
Payload power consumption: 3000 W-4000 W
Lifetime: 12-15 years


More at: DFH-3.

Subtopics

DFH-3 1, 2 (ZX 6, 6A / ChinaSat 6, 6A) Communication satellite built by CAST, China. Launched 1994 - 1997. Used the DFH-3 Bus bus.

FH-1 Chinese military communications satellite. 2 launches, 2000.01.25 (Zhongxing-22) to 2006.09.12 (Zhongxing 22A). In May 1999 Aviation Week reported that a new communication satellite, Fenghuo-1 (FH-1), would be launched by a CZ-3A by the end of 1999. Communication satellite built by CAST for People's Liberation Army (PLA), China. Launched 2000 - 2006. Used the DFH-3 Bus bus.

BD 1A, 1B, 1C, 1D Navigation satellite built by CAST, China. Launched 2000 - 2007. Used the DFH-3 Bus bus.

Beidou Chinese navigation satellite. Operational, first launch 2000.10.30. Beidou ('Big Dipper') was the satellite component of an independent Chinese satellite navigation and positioning system.

ST 1, 1B (ZX 20, 20A) Communication satellite built by CAST for People's Liberation Army (PLA), China. Launched 2003 - 2010. Used the DFH-3 Bus bus.

BD-2 M / BD-2 I Navigation satellite built by CAST, China. Launched 2007 - 2016. Used the DFH-3 Bus bus.

Sinosat 3 (Xinnuo 3) / ZX 5C (ChinaSat 5C) / Eutelsat 3A Communication satellite built by CAST for Sino Satellite Communications, China. Launched 2007. Used the DFH-3 Bus bus.

Chang'e 1 (CE 1) Lunar lander built by CAST, China. Launched 2007. Used the DFH-3A Bus bus.

TL 1A, 1B, 1C, 1D Communication satellite built by CAST, China. Launched 2008 - 2016. Used the DFH-3 Bus bus.

BD-2 G Navigation satellite built by CAST, China. Launched 2009 - 2016. Used the DFH-3 Bus bus.

Chang'e 2 (CE 2) Lunar lander built by CAST, China. Launched 2010. Used the DFH-3A Bus bus.

Chang'e-5 RRFV Reentry vehicle portion of Chang'e-5. The craft made an 8-day flight to loop around the Moon and return to Earth. The reentry vehicle separated from the main bus at 21:53 GMT and landed north of Hohhot at 22:42 GMT. Technology satellite built by CAST, China. Launched 2014. Used the DFH-3A Bus bus.

BD-3 G Navigation satellite built by CAST, China. Used the DFH-3B Bus bus.

Family: Communications, Geosynchronous orbit, Military communications sat, Moon, Navigation, Technology. Country: China. Engines: FY-25. Launch Vehicles: Chang Zheng 3A, Chang Zheng 3C. Projects: Chinastar. Launch Sites: Xichang, Xichang LC2, Xichang LC1. Agency: CAST, Chinasat, CNSA. Bibliography: 119, 2, 279, 4, 532, 6, 12209, 12210, 12211, 12212, 12213, 12214, 12215.
Photo Gallery

DFH-3DFH-3
Credit: via Chen Lan


DFH-3DFH-3
Credit: © Mark Wade


Beidou 1ABeidou 1A
Credit: Manufacturer Image


Beidou G5Beidou G5
Credit: Manufacturer Image


BD-3 GBD-3 G
Credit: Manufacturer Image


Chang'e-5 RRFVChang'e-5 RRFV
Credit: Manufacturer Image


Chang'e 1Chang'e 1
Credit: Manufacturer Image


Chang'e 2Chang'e 2
Credit: Manufacturer Image


Zhongxing-6Zhongxing-6
Credit: Manufacturer Image


Sinosat 3Sinosat 3
Credit: Manufacturer Image


Chinasat 20AChinasat 20A
Credit: Manufacturer Image


Tianlian 1-03Tianlian 1-03
Credit: Manufacturer Image



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