GPS Signal Power change 2020-02-14


SUMMARY OF THE EVENT: The 14th of February 2020, a false Solar Radio Burst (SRB) warning was issued. This was not a SRB as it occurs during the night time in Europe and as our SRB warning is only based on the monitoring of the GPS signal reception (C/N0) of the real-time EPN stations.
The effect detected was due to a change of the signal power of the GPS satellites of the block IIF and IIR-M starting at 00:00:00 UTC 14/02/2020. As a consequence, the signal reception for the tracking of these satellites was decreased by 2 dB-Hz for the L1 C/A signal and increased by 9 dB-Hz for the L2 P(Y) signal. This flex power change is still ongoing (12:00:00 UTC 18/02/2020).
This variation of signal strength should not have an impact on your GNSS applications, as the signal reception fade was smaller than 3dB-Hz.

Carrier to Noise Density Time Series

Figure : Carrier to Noise Density (in red) and its expected behaviour (in blue) for a satellite track at the begining of the event (left) and the end (right)