The Galileo Open Service and the Enhanced SAR/Galileo Service Performance Reports of the third quarter of 2021 (covering July, August, and September 2021) are available at the Electronic Library of the European GNSS Service Centre web portal.
The Galileo Open Service (OS) and SAR/Galileo Service Public Performance Reports for the third quarter of 2021 are available in the Performance Reports section, providing the status of the Galileo constellation and the achieved performance over the reported period (July, August, and September 2021).
These quarterly reports provide the public with the latest information on the Galileo OS and SAR/Galileo measured performance statistics with respect to their Minimum Performance Levels (MPLs) (as declared in their respective Galileo Service Definition Documents: OS-SDD and SAR-SDD). Both SDDs can be found in the Programme Reference Documents section of the GSC web portal.
The quarterly reports provide information to users on parameters such as:
- For Galileo Open Service (OS): Ranging Performance, Galileo UTC and GGTO Dissemination and Determination Performance, Galileo Positioning Performance, the Timely Publication of NAGUs, …
- For SAR/Galileo Enhanced Services: Forward Link Service, Detection and Location Performance, Return Link Service, RLM Delivery Latency and Reception Probability Performance, European MEOLUT and Space Segment Availability Performance, …
Highlights from Q3-2021 Public Performance Reports
As in previous periods, the Galileo measured OS and SAR Service performance figures exceeded their MPL thresholds, specified in the OS-SDD and SAR-SDD.
Some highlights from the Q3-2021 performance reports:
Galileo Open Service Ranging Performance:
- Per-slot Availability of Healthy Signal in Space for each Galileo operational satellite: average monthly values greater than 99.35% for every Single-Frequency and Dual-Frequency combination, considerably above the MPL threshold (87%).
- Galileo Signal in Space Ranging Accuracy for individual space vehicles: monthly accuracy between 0.20 [m] and 0.64 [m] on Single-Frequency observables. For Dual-Frequency combinations, the figure is in the range from 0.14 [m] to 0.35 [m]. Compliance with the MPL (threshold is 7 [m]) is achieved with considerable margins by all satellites of the Galileo constellation.
- Average Ranging Accuracy at constellation level (over “All Satellites”): figures “per signal” better than or equal to 0.32 [m] for Single-Frequency signals and 0.16 [m] for Dual-Frequency signal combinations. Achieved results are almost one order of magnitude better than the MPL threshold (2 [m]).
- Galileo UTC and GGTO Dissemination and Determination Performance: Good values have been achieved for the UTC Time Dissemination Service Accuracy, the UTC Frequency Dissemination Service Accuracy, and the GGTO Determination Accuracy.
- Galileo Positioning Performance: Availability of both Position Dilution of Precision (PDOP) and Positioning Service target values were met with a large margin.
- Timely Publication of NAGUs (Notice Advisory to Galileo Users): During the quarter only 4 NAGUs have been issued in the reporting period, respecting the requirements for their timeliness. The target is to issue a NAGU at least 24 hours before the start of a scheduled event, as well as not more than 72 hours after an unscheduled one.
Enhanced SAR/Galileo Service:
Availability of SAR/Galileo:
- Forward Link Service: exceeded 99% each month of the reported period and the annually normalised value since January 2021 achieved 99.8% in September (above defined MPL of 99%).
- MEOLUT facilities in “Nominal” and “Nominal + Degraded” modes: remains at excellent levels, with annually normalised values in September better than 97.6% and 98.8% respectively, always above the MPL targets of 95% in “Nominal” and 97.5% in “Nominal + Degraded” modes.
- Return Link Service: above 99.44% in August and 100% in July and September (MPL set to 95%).
- SAR Transponders: achieved excellent levels of performance reaching monthly satellite transponder availability of 100% for all space during the reported period.
- Detection Service: above expectations, with monthly values of a valid message detection probability after a single transmitted burst of 100% (MPL target is 99%).
- Location Probability: excellent values were achieved, with monthly values higher than 98.4% for a single burst (MPL target is 90%), and 99.3% after 12 transmitted bursts (multi-burst) (MPL target is 98%).
- Location Accuracy: surpassed the targets; monthly values higher than 99.1% for a single burst and 99.7% for multi-burst transmissions with accuracy better than 5 km, while the MPLs are 90% and 95% respectively.
Return Link Service:
- Delivery Latency within 15 min: 99.99% on average over the reported period (MPL set to 99%).
- Reception Probability: 100% over the reported period (MPL set to 99%).
For the most up-to-date information on the Galileo system and constellation, visit the European GNSS Service Centre (GSC) website, in particular, the Galileo constellation status section. For an exhaustive description of the Minimum Performance Levels (MPLs), refer to the SDDs (Programme Reference documents).
For more details on Galileo performance and its Services, do not hesitate to contact the Galileo Help Desk. Moreover, if you wish to receive NAGUs and notifications of new Galileo publications, please register to the GSC web portal and subscribe to our newsletters.
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