Measuring GNSS Satellite Transmit Power
July 7, 2017 • 786 Views
Workshop 2017 - Peter Steigenberger - Antenna thrust is a small acceleration acting on GNSS satellites due to the transmission of navigation signals. Knowledge about the actual effective isotropic radiated power (EIRP) of the GNSS satellite is required to compute this acceleration. EIRP measurements are obtained with a 30 m dish antenna operated by the German Aerospace Center (DLR). Comparisons with the current IGS model reveal differences of up to 50 W for GPS. For GLONASS, two subgroups of GLONASS-M satellites with significantly different transmit power levels could be identified as well as anomalies of several individual satellites. The newly derived transmit power values are introduced in a precise orbit determination and the impact of antenna thrust on GPS, GLONASS, Galileo, BeiDou-2 MEO and IGSO satellites is analyzed.