News Item

Galileo's first performance report

The European GNSS Agency (GSA) has published its first quarterly performance report on Galileo.

Galileo has undergone its first performance report since it started work at the end of last year - apparently passing with flying colours.

The ‘European GNSS (Galileo) Initial Services Open Service’ report covers the first 3 months of 2017, and documents the 'good performance' of Galileo Initial Services to date.

It shows that the 11-satellite constellation was able to provide healthy signals 97.33% of the time on a per-satellite basis, with a ranging accuracy better than 1.07 m and disseminating UTC time to within 30 billionths of a second on a 95% monthly basis.

Joerg Hahn, of ESA’s Galileo System Office, comments:
'Galileo Initial Services were declared by the European Commission on 15 December 2016. It was thanks to the tremendous effort of ESA’s Galileo team, working closely together with colleagues from the Commission and GSA, that this milestone could be achieved. The key pillars for reaching are the currently deployed Galileo satellites, in combination with the global Galileo ground segment infrastructure, defined and implemented by the ESA team with their respective industry partners.'

The Initial Service performance levels achieved by the system are monitored using 2 complementary monitoring platforms:
- the Time and Geodetic Validation Facility - an independent precision time-measuring system accurate to a billionth of a second, using an ensemble of atomic clocks located at ESA’s ESTEC Technical Centre in Noordwijk, the Netherlands.
- the Galileo System Evaluation Equipment, GALSEE, based in Rome.

In future, the independent monitoring of the services will be carried out by GSA’s Galileo Reference Centre - currently taking shape beside ESTEC in Noordwijk.

ESA explains that the results for Q1 2017 show that measured performance is generally far better than the minimum performance defined in the Service Definition Documents.

Joerg Hahn adds:
'Looking back over the ranging accuracy of the Galileo constellation from the time of the very first positioning fix in 2014 to the present, the overall performance trend for the Open Service is very positive. It has reached values of less than 1 m in recent months, being already competitive with other satellite navigation systems. The high-quality ranging service enables user-level positioning with a typical accuracy of around 3 m on the ground and 5 m in altitude during periods when 4 satellites are visible. With the limited infrastructure so far deployed, current horizontal position fixes can be achieved during more than 80% of the time with accuracies better than 10 m.'

He concludes:
'This user level performance is expected to improve with the launch of more satellites, making the provided Galileo services more accurate, more available and more robust for end users.'

The report can be downloaded from the link below . .

  • 05 June 2017
  • RIN

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