Galileo infographic: 'Locked onto Earth'

Locked onto Earth: Each Galileo satellite is dominated by its main, 1.4-m-diameter L-band navigation antenna, which transmits navigation signals down to Earth. This antenna is kept permanently locked onto the Earth disc using infrared ‘Earth sensors’ – a pair of which are placed just above the antenna, These work by homing in on the contrast between the heat of Earth’s atmosphere and the cold of deep space.

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