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Galileo satellites get the green light

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13 February 2014
Four-satellite Galileo constellation
Galileo In-Orbit Validation four-satellite constellation. In 2011 and 2012 the first four Galileo satellites were launched into orbit. Four is the minimum number of satellites needed to perform navigation fixes. In the year that followed, these satellites were combined with a growing global ground infrastructure to allow the project to undergo its crucial In-Orbit Validation phase.
Credits: ESA - P. Carril
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