Galileo infographic: 'Laser target'

Laser target: What looks like another rectangular antenna at the top of the Galileo satellite is actually a laser retroreflector. Once or twice a year, a laser beam is shone up each satellite by the international Laser Ranging Service – maintaining a map of laser stations around the globe – to deliver a ranging accuracy down to under a centimetre, significantly better than the half metre or so precision of S-band radio ranging.

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