Researchers from the National Time Service Center (NTSC) of the Chinese Academy of Sciences detected an abnormality in the system time of Galileo satellite navigation system (Galileo system for short) on December 14, 2020, and the abnormality lasted about 3 hours.
The team monitored that there were irregular jumps in information broadcast by some satellites in the Galileo system from 0:00 to 3:00 UTC on December 14, 2020 (8:00 am-11:00 am Beijing time). Taking UTC (NTSC) as a reference, the curve of Galileo system time (GST) relative to UTC (NTSC) is shown in Fig. 1.
Fig. 1 Time Bias of UTC(NTSC)-GST (Image by NTSC)
The abnormal period of the system time will affect the Galileo system navigation, positioning and timing functions. The research team will further analyze the final impact of the abnormality on the system.
This research team is responsible to monitor, evaluate and analyze time performance of GPS, Galileo, GLONASS and Beidou satellite navigation systems, and give the deviation from UTC (NTSC).
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