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From ham-radio to Galileo, small satellites spell success 
Next month should see the launch of the first Galileo satellite which will be paving the way for Europe's global positioning service. The GSTB-V2A spacecraft has been built by Surrey Satellite Technology Ltd. (SSTL) in the UK, a company which was created in 1980. Euronews has been to visit the former university students who pioneered the use of small satellites. "My interest in satellites started during the Apollo era in 1969," remembers Professor Martin Sweeting, today Chief Executive Officer of SSTL. "I was watching that just before I went to university." The University of Surrey in Guilford, 50 km from London, was to be the springboard for a spin-off company which now employs 250 people.
SSTL has been involved in over twenty different projects. Many of the first spacecraft built at Surrey were for amateur radio enthusiasts. But over the years, the company attracted a wide field of users, from Earth observation for countries without the financial resources to have conventional satellites, to specific civilian or military applications on demonstrator missions for major powers.
To bring down production costs and to cater for its clients’ requirements, SSTL resorted to industrial techniques and materials used in the car industry or in computing – the COTS (Commercial off The Shelf) approach.
"After we developed the 300 kg mini satellites, which was really stretching our capabilities upwards, we realised that we could respond to the ESA call, taking that platform, developing it a bit further and putting on some of the Galileo payload. It would offer a very low cost alternative to the conventional way of doing things."
Its final destination will be a 23,000 km orbit around the Earth. The satellite will validate new critical technologies and will transmit an experimental signal on radio frequencies attributed by the International Telecommunications Union. Galileo, to be fully deployed by 2008, will eventually have a 30-strong constellation of satellites in three orbital planes. It will be interoperable with the US GPS and the Russian Glonass systems but with a highly accurate 1-metre precision, so far only attainable with military systems.
Galileo signals will offer numerous civil applications – an estimated market of 1.8 billion users in all sectors of daily life. The most obvious will be localisation of, and two-way communication with, mobiles. Road vehicles, ships and aircraft will be able to navigate with greater precision and in areas where no terrestrial aids are available.
SSTL prides itself on the rapidity of development and reliability of its products. However, Martin Sweeting recognises that the company's approach still has to overcome certain reticences.
"In order to have low cost and rapid response, we have to adopt a much more industrial system, more akin to the information technology industry. It is difficult for large space agencies to change their mind set to actually use small satellites, the laptops of space, as opposed to the main frame computers of space."
EuroNews EuroNews is a key medium for delivering international information with a European point of view. Broadcast in 79 countries, EuroNews reaches 144 million households in Europe, the Middle East, Africa, Central Asia and North and Latin America via cable, digital satellite and through terrestrial channels. This Space Magazine is produced and broadcast every two weeks, with a new programme starting every second Friday. Each magazine is four minutes long and broadcast 21 times in one week, including evening prime time on Fridays and Saturdays, in order to reach a maximum audience. Broadcast times
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