Abstract
The Equivalent Isotropically Radiated Power (EIRP) by GPS satellites is needed to accurately calibrate the normalized bistatic radar cross section (NBRCS) measured by the Cyclone Global Navigation Satellite System (CYGNSS). EIRP is the product of GPS transmit power and antenna gain. To determine EIRP, we first estimate the GPS transmit power. A ground-based GPS constellation power monitor (GCPM) system has been built and calibrated to precisely measure GPS signals. The received power is repeatable and verified with German Aerospace Center (DLR)'s independent measurements. The estimated GPS transmit powers are validated with DLR's results and successfully applied to CYGNSS L1 calibration. GCPM measurements also demonstrate GPS antenna pattern asymmetries. Full GPS antenna patterns (over their terrestrial service volume) are estimated using the measurements made with the CYGNSS zenith antennas. CYGNSS zenith antenna measurements are able to sample the full transmit antenna pattern within a very short time.
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