Space


Surrey Satellite

Since 1981 the University of Surrey and later Surrey Satellite Technology Limited (SSTL) have been successfully deploying 50 kg-class microsatellites for LEO store/dump communications, primarily for use by the amateur radio community. Designated UoSAT, thefirst of these satellites was launched as a piggyback with the U.S. Solar Mesopheric Explorer in October, 1981. UoSAT 2 accompanied the U.S. Landsat 5, while UoSAT 3 and 4 hitched a rideon the SPOT 2 mission. UoSAT 5 was launched along with ESA's ERS-1 on 17 July 1991 and was a repeat of the UoSAT 4 vehicle which had malfunctioned almost immediately after launch.

The French S80/T and the South Korean Kitsat 1 were also Surrey products launched in 1992. The following year PoSAT 1 and Healthsat 2 joined the list of Surrey-produced satellites, while Kitsat 2 was constructed with Surrey components. Two more Surrey satellite platforms are expected to fly in 1995: France's CERISE and Chile's FASat Alpha.

The standard SSTL modular spacecraft bus has a mass of 50 kg (including a 7-10 kg payload) and dimensions of 33 cm by 33 cm by 60 cm. Silicon or gallium arsenide solar cells generate 30 W at beginning of life with 8-10 W average for the payload in a LEO polar orbit. Attitude system pointing accuracy is less than five degrees (References 420-422).



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Page last modified: 21-07-2011 00:55:12 ZULU