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DFH-4

DFH-4

DFH-4
Credit: NigComSat

Large Chinese communications satellite bus using a blend of Chinese and subcontracted European technologies. The DFH-4 was 3-axis stabilized and designed for use in high capacity communications and broadcasting, direct broadcasting, and regional mobile communications satellites.Payloads of up to 600 kg requiring 8,000 W power could be accomodated in the initial version; the DFH-4E enhanced version increased this to 1,000 kg / 10,000 W and introduced electric propulsion. The DFH-4S could accommodate smaller requirements with 450 kg /4000 W requirements.

AKA: Dong Fang Hong;Nigcomsat;Simon;Tian Lian;TKSAT;Tongxing Jisshu Shiyan Weixing;Tupac Katari;VeneSat;Xinnuo. Status: Operational 2006. First Launch: 2006-10-28. Last Launch: 2015-11-03. Number: 15 . Gross mass: 5,000 kg (11,000 lb).

Chinese Aerospace Corporation (CASC) announced in July 1998 that it would develop a new large geosynchronous satellite bus which would be used for variety of new generation Chinese satellites in the next century. CASC was to select a foreign company as a partner. All satellites based on this new bus would be designed, assembled and tested in China, and launched by Chinese Long March boosters. Four European companies submitted proposals. The satellite could be equipped with a mixture of C-, Ku-, and even L-band transponders, and multi-beam antenna systems. This would be a step beyond the DFH-3, to satisfy the requirements for direct broadcast services; fixed and mobile communications using very small aperture antennas; and other dedicated special services.

The final DFH-4 platform was 3 axis stabilized and equipped with a bi-propellant propulsion system. It utilized C-band for command and control. It was based on a mixture of technologies from the prior DFH-3 and European satellite technology. Specifications were as follows:

Dimensions: 2360 mm × 2100 mm × 3600mm
Payload: 600 kg
Orbit type:GEO and other orbits
Solar array output: 10,500W (EOL)
Payload power: 8,000 W
Station keeping precision: west/east +-0.05 deg; north/south +-0.05 deg
Antenna pointing precision: <0.1 deg (3 sigma)
Design lifetime: 15 years
The DFH-4E Bus was an enhanced version of the DFH-4 with greater capacity. It incorporated advanced technologies, including electrical propulsion, more efficient batteries, and multi-tiered communications module, an increased load carrying structure, more efficient thermal control, and overlap antenna holding and releasing technologies. The new triple-junction gallium-arsenide solar cells generated 65 kw per kilogram. Lithium-ion batteries replaced nickel-hydrogen in the original model, saving 80 kg.

Characteristics were as follows:
Launch Mass: 5000-5300 kg
Dry Mass: 2700 kg
Output power: 13,500 W
Payload Mass: 800-1000 kg
Payload Power: 10,000 W
Lifetime: 15 years
First flight: NigComSat, May, 2007
A further development of the DFH-4 was the the DFH-4S ("Small but Smart"). CAST began developing the DFH-4S in 2006 for an unspecified (probably Chinese military) customer. The bus introduced advanced avionics and lithium-ion batteries, and a plasma propulsion system (PPS).
Launch Mass: 4600 kg
Dry Mass: 1590 kg
Output power: 7800 W
Payload Mass: 450 kg
Payload Power: 4000 W


More at: DFH-4.

Subtopics

Sinosat 2, 4 (Xinnuo 2, 4) / ZX 9A (ChinaSat 9A) Communication satellite built by CAST for Sino Satellite Communications => China Satcom, China. Launched 2006 - 2017. Used the DFH-4 bus bus.

NIGCOMSAT 1, 1R Communication satellite built by CAST for NigComSat LTD, Nigeria. Launched 2007 - 2011. Used the DFH-4 bus bus.

VENESAT 1 (Simon Bolivar 1) Communication satellite built by CAST for Ministry of Science and Technology of Venezuela, Venezuela. Launched 2008. Used the DFH-4 Bus bus.

ZX 6A (ChinaSat 6A) Communication satellite built by CAST for China Satcom (formerly Sino Satellite Communications), China. Launched 2010. Used the DFH-4 bus bus.

ZX 10 (ChinaSat 10) Communication satellite built by CAST for China Satcom (formerly Sino Satellite Communications), China. Launched 2011. Used the DFH-4 bus bus.

Paksat 1R Communication satellite built by CAST for SUPARCO, Pakistan. Launched 2011. Used the DFH-4 Bus bus.

FH 2A, 2B, 2C (ZX 1A, 1B, 1C) Communication satellite built by CAST, China. Launched 2011 - 2015. Used the DFH-4 bus bus.

ST 2A, 2B, 2C (ZX 2A, 2B, 2C) Communication satellite built by CAST for People's Liberation Army (PLA), China. Launched 2012 - 2015. Used the DFH-4 bus bus.

ZX 11 (ChinaSat 11) Communication satellite built by CAST for China Satcom, China. Launched 2013. Used the DFH-4 bus bus.

T+pac Katari 1 (TKSat 1) Null

APStar 9 / MySat 1 Communication satellite built by CAST for APT Satellite Company Ltd., China. Launched 2015. Used the DFH-4 Bus bus.

LaoSat 1 Communication satellite built by CAST, Laos. Launched 2015. Used the DFH-4S Bus bus.

Belintersat 1 (ZX 15, ChinaSat 15) Communication satellite built by CAST for Belintersat, Belarus. Launched 2016. Used the DFH-4 Bus bus.

Tiantong-1 01 Communications satellite built by CAST for China SatCom, China. Launched 2016. Used the DFH-4 Bus bus.

SJ 17 Technology satellite for CAST, China. Launched 2016. Used the DFH-4S Bus bus.

SJ 13 / ZX 16 (ChinaSat 16) Technology satellite built by CAST, China. Launched 2017. Used the DFH-4S Bus bus.

AlComSat 1 Communication satellite built by CAST for Agence Spatiale Algérienne (ASAL), Algeria. Used the DFH-4 Bus bus.

APStar 6B Communicationsatellite built by CAST for APT Satellite Company Ltd.. Used the DFH-4 Bus bus.

APStar 6C Communication satellite built by CAST for APT Satellite Company Ltd., China. Used the DFH-4 Bus bus.

CongoSat 01 Communication satellite built by CAST for Renatelsat. Used the DFH-4 Bus bus.

NicaSat 1 (LSTSAT 1) Communication satellite built by CAST, Nicaragua. Used the DFH-4 Bus bus.

SupremeSat 2 Communication satellite built by CAST for SupremeSat (Pvt.) Ltd.. Used the DFH-4 Bus bus.

ZX 18 (ChinaSat 18) Communication satellite built by CAST for China Satcom, China. Used the DFH-4E bus bus.

ZX 6C (ChinaSat 6C) Communication satellite built by CAST for China Satcom, China. Used the DFH-4 bus bus.

Family: Communications, Geosynchronous orbit, Military communications sat. Country: China. Launch Vehicles: Chang Zheng 3B, Chang Zheng 3BE, Chang Zheng 3C. Launch Sites: Xichang, Xichang LC2. Agency: CAST, Chinasat, CASC, CNSA. Bibliography: 2, 4, 424, 530, 6453, 12216, 12217, 12218, 12219, 12220, 12221, 12222, 12223, 12224.
Photo Gallery

APStar 9 / MySat 1APStar 9 / MySat 1
Credit: Manufacturer Image


Belintersat 1Belintersat 1
Credit: Manufacturer Image


Nigcomsat 1Nigcomsat 1
Credit: Manufacturer Image


Paksat 1RPaksat 1R
Credit: Manufacturer Image


Sinosat-2Sinosat-2
Credit: Manufacturer Image


SupremeSat 2SupremeSat 2
Credit: Manufacturer Image


Tupac Katari 1Tupac Katari 1
Credit: Manufacturer Image


Simon BolivarSimon Bolivar
Credit: Manufacturer Image


Zhongxing-10Zhongxing-10
Credit: Manufacturer Image


Chinasat 6AChinasat 6A
Credit: Manufacturer Image


Sinosat-2Sinosat-2
Credit: Manufacturer Image



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