EU's positioning satellite system 'Galileo' is downing the entire system due to large scale failure

by ESA-P. Carril

A major system failure has occurred in the Global Positioning Satellite System (GNSS) “Galileo” built by the EU, and the service has stopped at 13:00 on July 11, 2019 (

Central European Time ). Prospect of even system recovery in the article creation time is that of a not standing.

Galileo Initial Service recovery actions underway | European Global Navigation Satellite Systems Agency

Galileo constellation outage – Daniel Estévez

Galileo Service Degraded On All Satellites Until Further Notice-Inside GNSS

Galileo is a GNSS developed for the first time in the world involving the private sector, and is a system capable of positioning with an accuracy of less than 1 meter. Unlike the Global Positioning System (GPS), which was developed for military use and may be restricted for political reasons, Galileo, with a budget of € 9 billion (about ¥ 1,090.0 billion), will have to pay from 2020 A full service commercial deployment was planned.

According to the European GNSS Agency, which manages Galileo, the Galileo system went down shortly after July 11. “The service seems to be out of order. The restoration work is underway, and the system will be restored within 48 hours. 'At the official site for the user.' In addition, the Abnormal Diagnosis Committee has been convened and is working on emergency restoration work without a break. However, Galileo's system is still down, even when an article has been created more than a week after the failure. You can check the status of the system from the following site.

Constellation Information | European GNSS Service Center

Everything is NOT AVAILABLE (not available) or NOT USABLE (not available) except E18 and E14, which are originally for testing.

According to Daniel Estevez, an amateur radio and GNSS engineer, the main cause of the Galileo system failure is likely to be a

time synchronization failure.

A facility called 'Precise Timing Facility (PTF)' in Italy and Germany has a cesium atomic clock and a hydrogen maser atomic clock, and synchronizes Galileo's time once every 100 minutes. If this time synchronization fails, the satellite's orbit schedule called ' ephemeris ' will not be calculated correctly. The ephemeris needs to be created regularly, as errors will always occur in actual satellite orbits. Esteves has published the ephemeris XML file actually output from Galileo to GitHub, and pointed out that the orbit calculation has not been correctly performed by Galileo after July 11, 2019.

by ESA

It is unclear why PTF and Galileo's time synchronization has failed, but it seems that there is a problem with PTF when

insideGNSS dealing with GNSS related topics has been heard from a Galileo representative . According to official testimony, Galileo has experienced two major system failures, both of which have problems with Galileo-related ground facilities built by the French space company Thales Alenia Space. It was said that there was.

by ESA-Anneke Le Floc'h

A spokesman for the European GNSS Agency said, “This failure can occur while incorporating robustness into the system. Galileo needs to be aware that it is an initial service phase and is not fully operational. '. In addition, InsideGNSS seems to have requested a comment from the European GNSS Agency about the cause of the failure, but it was said that there was no reply.

in Hardware,   Science, Posted by log1i_yk