Galileo Initial Services Open Service and SAR/Galileo Enhanced Services Performance Reports covering the first quarter of 2020 are available in the Electronic Library of the European GNSS Service Centre web portal.
These quarterly reports provide the public with the latest information on the Galileo OS and SAR/Galileo Services 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. It should be noted that this SAR/Galileo Service Performance Report is the first one following the declaration of the SAR/Galileo Enhanced Services and the publication of the updated SDD last January.
Some highlights from the Q1-2020 performance reports:
- Initial Service OS:
- Galileo Initial Open Service Ranging Performance: This is measured based on the Availability of the Galileo SF/DF Ranging Service [between 96.29% (all signals, March) and 96.42% (SIS E5a and Dual Frequency combination E1-E5a, February)], Per-slot Availability of Healthy Signal in Space for each Galileo operational satellite [low values were observed for GSAT-209 (86.71% in February) and GSAT-103 (with F/NAV and I/NAV SIS availability of respectively 45.34% and 51.52% during March)] and the Galileo Signal in Space Ranging Accuracy [for individual space vehicles: worst case value of 0.41 [m] for DF in February and 0.68 [m] for SF in February and March; best case values of 0.15 [m] for DF in January and 0.22 [m] for SF in February and March].
- Galileo UTC and GGTO Dissemination and Determination Performance: The Galileo UTC Determination Service Availability reached a monthly value of 100% during the entire quarter, exceeding the MPL target of 87%. Moreover, the GGTO Determination Availability exceeds the MPL target of 80% over the reported months, reaching 100% in January and March.
- Galileo Positioning Performance: This is measured based on the Availability of the Galileo Position Dilution of Precision and the Positioning Service, and the Galileo measured Positioning Performance.
- Timely Publication of NAGUs (Notice Advisory to Galileo Users): The timeliness requirements for NAGU publication were met both for Planned and Unplanned events (NAGUs related to planned events need to be published at least 24 hours before the event starts, and those related to unplanned events with a delay of up to 72 hours from the detection of the unplanned event). A total number of 8 NAGUs have been published on the GSC web portal in the reported period.
- Enhanced SAR/GALILEO Service:
- Availability of SAR/Galileo:
- Forward Link Service: 99.9% for the reported period (above defined MPLs of 99%).
- MEOLUT facilities in “Nominal” and “Nominal + Degraded” modes: remain at excellent levels, always above the MPL targets of 95% in “Nominal” and 97.5% in “Nominal + Degraded” modes.
- Return Link Service: 100% all over the period (MPL set to 95%).
- SAR Transponders: achieved excellent levels of performance reaching monthly satellite transponder availability of 100% for almost all space vehicles (except for GSAT-214 in February, and for GSAT-103 in March).
- Performance of:
- Detection Service: monthly values of a valid message detection probability after a single transmitted burst over 99.7%, where the MPL target is 99%.
- Location Probability: excellent values were achieved, with monthly values higher than 99.3% for a single burst, where the MPL target is 90%, and 99.7% after 12 transmitted bursts (multi-burst), where the MPL target is 98%.
- Location Accuracy: surpassed the targets with monthly values higher than 98.6% for a single burst and 99.1% 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: 99.94% on average over the reported period for an MPL set to 99%.
- Reception Probability: 99.76% in average over the reported period for an MPL set to 99%.
- Availability of SAR/Galileo:
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 automatically, please register to the GSC web portal.[source: European GNSS Agency (http://www.gsa.europa.eu)]