Providing the High Accuracy Service

Galileo's new High Accuracy Service further improves on current system performance through the use of a High Accuracy Data Generator based at the Galileo Control Centre in Fucino, Italy, generating additional  corrections for Galileo as well as US GPS satellites. These corrections are then relayed to compatible receivers in real time through the Galileo satellite signal – compiled into a single message of 448 bits per second, a unique capability of the carefully-engineered Galileo signal shape. Compared to the Galileo Open Service, the corrections are made available very rapidly and very often – with an update for satellite orbits every 30 seconds and for satellite clocks every 10 seconds. And the HAS correction message is designed in such a way that suitable receivers can benefit from multiple satellites broadcasting it, to reconstruct the overall message very rapidly.