[IGSMAIL-7785] Flex Power June 20 and 21, 2019

[Peter Steigenberger]

Dear colleagues,

based on carrier-to-noise density ratio observations (C/N0) of IGS 
receivers, we observed global flex power operations on June 20 and 21, 
2019. Flex power started subsequently for all healthy Block IIR-M and 
IIF satellites on June 20 between 15:18 and 17:49 UTC. C/N0 of the 
P(Y)-code tracking increased by roughly 10 dB for all healthy Block 
IIR-M and IIF satellites whereas C/N0 of the C/A-code decreased by about 
2-3 dB for the healthy IIR-M satellites only. The changes in power 
levels are similar to flex power mode III discussed in "Steigenberger P, 
Thölert S, Montenbruck O. (2019) Flex power on GPS Block IIR-M and IIF, 
GPS Solutions, doi:10.1007/s10291-018-0797-8". All satellites returned 
to normal power levels on June 21 between 6:00 and 10:00 UTC.

Best regards

Peter

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Peter Steigenberger
Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)
German Space Operations Center
Oberpfaffenhofen
D-82234 Wessling
Germany

Tel.    +49 (8153) 28-3765
Fax     +49 (8153) 28-1450
e-mail  peter.steigenberger at dlr.de
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