The Galileo Open Service (OS), the Galileo High Accuracy Service (HAS) and the Enhanced Search and Rescue (SAR) Service Performance Reports for Q1 2024 are available at the GSC Electronic Library.

 

The Reports for Q1 2024 are available on our website in the Performance Reports section, providing the status of the Galileo constellation and the achieved performance.

These quarterly reports provide users with the latest performance statistics on the Galileo OS, HAS and SAR/Galileo, measured against their Minimum Performance Levels (MPLs) as outlined in their respective Galileo Service Definition Documents: OS-SDD, HAS-SDD and SAR-SDD. All SDDs can be found here.

The quarterly reports provide information to users on parameters such as:

  • Galileo OS: Ranging Performance, Galileo UTC and Galileo-GPS Time Offset (GGTO) Dissemination and Determination Performance, Galileo Positioning Performance, the Timely Publication of NAGUs (Notice Advisory to Galileo Users).
  • Galileo HAS: Accuracy and Availability of the HAS corrections, and Service Coverage.
  • SAR/Galileo Enhanced Services: Forward Link Service, Detection and Location Performance, Return Link Service, Return Link Message (RLM) Delivery Latency and Reception Probability Performance, European MEOLUT and Space Segment Availability Performance.

Highlights from Q1 2024 Public Performance Reports:

During the reporting period, the measured Galileo OS, HAS and SAR performance figures exceeded their MPL thresholds, specified in the OS-SDD, HAS-SDD and SAR-SDD.

Key highlights:

Open Service:

  • Galileo Open Service Ranging Performance:
    • Per-slot Availability of Healthy Signal in Space for each Galileo operational satellite: average monthly values at least equal to 97.00% for every Single-Frequency and Dual-Frequency combination, above the MPL threshold (92%);
    • Galileo Signal in Space Ranging Accuracy for individual space vehicles: monthly accuracy between 0.41 [m] and 2.08 [m] on Single-Frequency observables. For Dual-Frequency combinations, the accuracy was in the range of 0.14 [m] to 0.39 [m]. Compliance with the MPL target (threshold is 7 [m]) was achieved with considerable margins by all satellites of the Galileo constellation;
    • Worst-satellite ranging accuracy, Global Average at 99.9% confidence level: values between 0.41 [m] and 2.08 [m] on Single Frequency observables. For Dual-Frequency combinations, values are between 0.22 [m] to 1.58 [m]. Since December 2023, such ranging accuracy at high confidence level is subject to MPL targets: as  Global Average: ≤ 10 m (SF, DF) and for Worst User Location: ≤ 20 m (SF, DF). Compliance with the MPL target achieved with significant margins;
    • Average Ranging Accuracy at constellation level (over “All Satellites”): figures “per signal” better than or equal to 0.46 [m] for Single-Frequency signals and 0.15 [m] for Dual-Frequency signal combinations. Achieved results at least one order of magnitude better than the MPL threshold (2 [m]).
  • Galileo UTC and GGTO Dissemination and Determination Performance: achieved good values for the UTC Time Dissemination Service Accuracy, the UTC Frequency Dissemination Service Accuracy, and the GGTO Determination Accuracy.
  • Galileo Positioning Performance: met both Position Dilution of Precision (PDOP) and Positioning Service availability target values by a significant margin.
  • Timely Publication of NAGUs for the OS: issued 10 NAGUs during the quarter, meeting timeliness requirements (target to issue a NAGU at least 48 hours before the start of a scheduled event, as well as not more than 30 hours after the occurrence of an unscheduled one). The most recent OS-SDD in force, applicable since December 2023, foresees 15 hours of maximum delay in the notification of unplanned NAGUs related to service recovery.

High Accuracy Service:

  • Accuracy of the HAS Corrections provided via terrestrial dissemination (IDD) and via SIS for:
    • Orbit was better than or equal to 0.17 [m] for Galileo and  0.19 [m] for GPS satisfying the MPL thresholds (0.20 [m] for Galileo and 0.33 [m] for GPS);
    • Clock offset was better than or equal to 0.08 [m] for Galileo and 0.12 [m] for GPS in compliance with the MPL targets (0.12 [m] for Galileo and 0.15 [m] for GPS);
    • Code bias was better than or equal to 0.24 [m] for Galileo and 0.24 [m] for GPS. Compliance with the MPL target (threshold is 50 [m] for both Galileo and GPS) was achieved with considerable margins.
  • Availability of the HAS Corrections provided via terrestrial dissemination and SIS exceeded 89.11% for Galileo-only corrections (above defined MPL target of 87 %) and not lower than 94.3% for Galileo + GPS corrections.
  • Service coverage was 100% over the whole reporting period considering HAS corrections dissemination via SIS. Instead, considering dissemination via IDD, Service coverage was 100% only in February and March. In January, the MPL on the availability of Galileo + GPS corrections disseminated via IDD slightly dropped below the threshold: reported value is 94.30%, while MPL threshold is 95%. This punctual degradation was due to an update of the system.
  • Timely publication of NAGUs for the HAS: during the quarter, 8 NAGUs were issued respecting the requirements for their timeliness (target to issue a NAGU at least 48 hours before the start of a scheduled event, as well as not more than 30 hours after the occurrence of an unscheduled one).

Enhanced SAR/Galileo Service:

  • Availability of SAR/Galileo:
    • Forward Link Service: achieved 99% MPL target throughout the reporting period, with a yearly normalised value of 99.93%;
    • MEOLUT facilities in “Nominal” and “Nominal or Degraded” modes: significantly impacted by planned technical upgrades occurred in 2023 affecting the required “annual normalisation”. Larnaca EU MEOLUT in “Nominal or Degraded” mode satisfied the MPL target of 97.5% over the quarter. Spitsbergen did not meet any availability targets in “Nominal” nor “Nominal + Degraded” modes, over the whole period. Maspalomas recovered the expected availability figures both in “Nominal”, and in “Nominal or Degraded” operating conditions in February and March. The monthly (not normalised) availability figures for the MEOLUT equipment were in line with the MPL targets over the whole quarter;
    • Return Link Service: above 99.95% every month of the reported period (MPL set to 95%);
    • SAR Transponders: except for the specific cases of GSAT0201 and GSAT0202, SAR Transponders availability achieved excellent levels of performance, with satellite long-term availability above the MPL target of 95% for all the SAR transponders.
  • Performance of:
    • Detection Service: is above expectations, with monthly values of a valid message detection probability after a single transmitted burst of 100% every month of the reported period for all sites, except for GAL-EU4 (Maspalomas) in February (99.9%), while the MPL target is 99%;
    • Location Probability: achieved excellent values with monthly values above 99.9% for single-burst (MPL target is 90%), and 100% after 12 transmitted bursts (multi-burst) with all reference beacons (MPL target is 98%);
    • Location Accuracy within 5 km: surpassed the targets; monthly values higher than 98.9% for single-burst and 99.9% for multi-burst transmissions, while the MPLs are 90% and 95% respectively.
  • Return Link Service:
    • Delivery Latency within 15 min: above 99.60% every month of the reported period (MPL set to 99%);
    • Reception Probability: above 99.72% in every month of the reported period (MPL set to 99%).

For the most up-to-date information on the Galileo system and constellation, visit the European Union GSC website, in particular, the Galileo constellation status section.

If you wish to receive NAGUs and notifications of new Galileo publications, please register to the GSC web portal and subscribe to our newsletters.

Media note: This feature can be republished without charge provided the European Union Agency for the Space Programme (EUSPA) is acknowledged as the source at the top or the bottom of the story. You must request permission before you use any of the photographs on the site. If you republish, we would be grateful if you could link back to the EUSPA website (http://www.euspa.europa.eu).