The European GNSS Agency (GSA) has published its first Galileo Initial Services Open Service (IS OS) quarterly performance report.

Following the Declaration of Initial Services in December 2016, the GSA will publish a new Galileo IS OS report after each quarter. These quarterly reports aim to provide the public with the latest information on the Galileo Open Service’s performance.

The document reports on such parameters as:

• Galileo Initial Open Service Ranging Performance
• Galileo Coordinated Universal Time (UTC) Dissemination and Galileo to GPS Time Offset (GGTO) Determination Performance
• Galileo Positioning Performance
• Timely Publication of Notice Advisory to Galileo Users (NAGUs)

Each of these parameters is examined with respect to their Minimum Performance Levels (MPLs), as declared in the Galileo Open Service Definition Document [OS-SDD].

Highlights from Q1 2017
In the first quarterly reporting period after the Declaration of Galileo Initial Services, the measured Galileo Initial Open Service performance figures generally exceeded the MPL targets specified in the OS-SDD by significant margins.

Some highlights from the report:

• Availability of the Galileo Ranging Service at the Worst User Location (WUL), with monthly values of 100%, is significantly above expectations, where the MPL is 87%.
• The Signal in Space Ranging Accuracy shows a 95^th percentile monthly accuracy better than 1.07 [m] for individual space vehicles.
• Availability of the Galileo UTC Time Determination Service was achieved, with a monthly value of 100%, compared to the [OS-SDD] MPL target of 87%.
• Availability of GGTO Determination (not declared as a Service in this phase) was 100% in January and March. February showed a slightly lower figure of 96.44%, although still well above the [OS-SDD] MPL target of 80%.
• Excellent values were achieved for UTC Time Dissemination Service Accuracy. The measured Galileo Initial Open Service performance figures generally exceeded the MPL targets specified in the OS-SDD by significant margins.

The report, which covers the first three months of 2017, is available for download below.