The Galileo Open Service (OS), the Galileo High Accuracy Service (HAS) and the Enhanced Search and Rescue (SAR) Service Performance Reports for Q4 2023 are available at the GSC Electronic Library

The Reports for Q4 2023 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 Q4-2023 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 95.96% 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 0.25 [m] and 1.30 [m] on Single-Frequency observables. For Dual-Frequency combinations, the accuracy was in the range of 0.14 [m] to 0.38 [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 0.44 [m] and 1.69 [m] on Single Frequency observables. For Dual-Frequency combinations, values are between 0.23 [m] to 1.44 [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 4 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 0.23 [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 0.07 [m] for Galileo and 0.10 [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 0.21 [m] for Galileo and 0.27 [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 91.50% for Galileo-only corrections (above defined MPL target of 87 %) and not lower than 98.19% for Galileo + GPS corrections (above defined MPL target of 95 %).
  • Coverage of the HAS Service was always 100%, in the entire service area.
  • Timely publication of NAGUs for the HAS: during the quarter, 1 NAGU was 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 exceeding 99.93%;
    • MEOLUT facilities in “Nominal” and “Nominal or Degraded” modes: Only Larnaca EU MEOLUT in “Nominal or Degraded” mode satisfied the MPL target of 97.5% over the quarter, while the other two EU MEOLUTs did not: not in “Nominal”, nor in “Nominal or Degraded” operating conditions due to planned technical upgrades and the computation strategy for the MPLs, as the monthly (not normalised) availability figures for the MEOLUT equipment was in line with MPL targets over the whole quarter;
    • Return Link Service: maintained above 99.84% 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: exceeded expectations, with a monthly probability of valid message detection after a single transmitted burst of 100% every month of the reported period for all sites, except for GAL-EU5 (Larnaca) in December (99.9%), while the MPL target is 99%;
    • Location Probability: achieved excellent values with monthly values above 99.8% for single-burst (MPL target is 90%), and above 99.9% after 12 transmitted bursts (multi-burst) (MPL target is 98%);
    • Location Accuracy within 5 km: surpassed the targets; monthly values higher than 99.1% for single-burst and 99.8% for multi-burst transmissions with an accuracy better than 5 km, while the MPLs are 90% and 95% respectively.
  • Return Link Service:
    • Delivery Latency within 15 minutes: above 99.59% every month of the reported period (MPL set to 99%);
    • Reception Probability: above 99.80% 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.

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