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Galileo Elliptical Auxiliary Satellites Removed from Service

Two Galileo satellites launched in 2014 by a Soyuz rocket into erroneous orbits, which had been briefly set healthy late last year, have now been removed from service. The change stems from the discovery that, while the vast majority of users obtained an improved positioning, some commercial receivers had difficulty with the satellites’ highly elliptical orbits, created by the malfunction in the Russian launch vehicle.
The European GNSS Agency (GSA) issued a Service Notice to Galileo Users (SNGU) on February 16:
Galileo SNGU In Force
“On 30 November 2020, flags were removed from GSAT0201 and GSAT0202 satellites, making these satellites available for positioning as auxiliary satellites. Following the removal of these flags, the Galileo Programme set up an observation period to collect user feedback and experience with the use of these satellites. ....

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Galileo Outage Update: Ground Atomic Clock at Fault

Pursuant to the 6-hour Galileo system outage on December 14, the European GNSS Agency (GSA) issued an update stating that the “service incident,” while still under investigation, “is confirmed to be related to an abnormal behaviour of a ground atomic clock in the time determination function of the system.”
Galileo FNAV December 14 outage
The statement continues “The time synchronisation and orbit determination algorithms immediately flagged the data as MARGINAL (SISA =NAPA ) before it affected the quality of the measurements. However, the incorrect data was still uploaded to the satellites. User receivers that do not process the health and status flags, or that keep MARGINAL satellites as part of the position solution computation, may have experienced large positioning errors.” ....

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