The European navigation system Galileo was faced with a serious problem that disabled 24 of the 26 satellites (two are in test mode). This happened on July 11, but since then the GPS satellite constellation operator (the European Global Navigation Satellite Systems Agency) has not provided public information about what caused the satellite to go off .
On July 11, the agency issued a warning to its customers (government agencies and private companies) that the satellite signal was degraded and may not meet the minimum level of performance. So using the Galileo system is at your own risk. Yesterday, at the agency’s Web site appeared a message saying that the cause of failure was the group “technical incident” related ground infrastructure. However, the exact cause of this incident is not called.
Some experts suggest that the reason for the failure of the navigation system was a software error that could be flooded onto satellites from ground stations during a communication session. Error in the software was the cause of the short-term failure of the Russian GLONASS system a few years ago. However, it remains only to wait for an official comment.
The Galileo system began its deployment in orbit in 2011, and was officially launched in 2016. A year later, it was reported that the system signals are not sufficiently protected from hacker attacks. Scientists from Belgium took up the problem.