A Soyuz rocket launched two Galileo satellites into orbit on Friday, marking a crucial step for Europe’s planned navigation system, operator Arianespace announced.
The launch took place at the Kourou space base in French Guiana, at 3:15pm (6:15pm GMT).
Three and three-quarter hours later, the 700kg satellites were placed into orbit.
Photo: EPA
The new satellites add to the first two in the Galileo navigation system, which were launched on Oct. 21, last year.
Together they create a “mini-constellation.” Four is the minimum number of satellites needed to gain a navigational fix on the ground, using signals from the satellite to get a position for latitude, longitude, altitude and a time reference.
Galileo will ultimately consist of 30 satellites, six more than the US Global Positioning System.
By 2015, 18 satellites should be in place, which is sufficient for launching services to the public, followed by the rest in 2020, according to the European Space Agency.
It is claimed that the system will be accurate to within one meter. The US Global Positioning System, which became operational in 1995 and is currently being upgraded, is currently accurate to between three and eight meters.
In May, the European Commission said the cost by 2015 would be 5 billion euros (US$6.45 billion).
As a medium-sized launcher, Soyuz complements Europe’s heavyweight Ariane 5 and lightweight Vega rockets.
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