The sidereal day of Global Positioning System (GPS) satellites is approximately 11 hours 58 minutes. We carried out a periodic analysis of the sidereal day shift for GPS satellites and compared it to the periodicities of the geomagnetic activity and the high-speed solar wind stream during the 11 years. It is revealed that the sidereal period of the GPS satellites shows small-amplitude oscillations with a 13.6-day periodicity. We verified that all of solar wind parameters have 9.0- and 13.5-days periodicities, similar to those observed in the GPS orbital perturbation.

Keywords: GPS, period, space weather