The exchange of the data between the Control Centres and the satellites is performed through up-link stations.Īs a further feature, Galileo is providing a global Search and Rescue (SAR) function, based on the operational Cospas-Sarsat system. The GCCs use the data from the Sensor Stations to compute the integrity information and to synchronise the time signal of all satellites with the ground station clocks. The data provided by a global network of Galileo Sensor Stations (GSSs) are sent to the Galileo Control Centres through a redundant communications network. Two Galileo Control Centres (GCCs) have been implemented on European ground to provide for the control of the satellites and to perform the navigation mission management. The large number of satellites together with the carefully-optimised constellation design, plus the planned availability of three active spare satellites per orbital plane, should ensure that the loss of one satellite should have no discernible effect on the user. Galileo navigation signals provide good coverage even at latitudes up to 75 degrees north, which corresponds to Norway's North Cape - the most northerly tip of Europe - and beyond. Then as the constellation is built-up beyond that, new services will be tested and made available. Initial services became available on 15 December 2016.
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