GPS Signal Power change 2020-04-06

Contact: iono@gnss.be

SUMMARY OF THE EVENT: The 6th of April 2020, a false Solar Radio Burst (SRB) warning was issued. The effect detected was due to a change of the signal power of the GPS satellites G17 and G31 of the block IIR-M starting at 22:20:00 UTC 06/04/2020 and ending at 01:23:30 UTC 07/04/2020. As a consequence, the signal reception for the tracking of these satellites was decreased by 10 dB-Hz for the L2 P(Y) signal.

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)