Calibration of GPS Satellite Antenna Based on Different Reference Frames

Abstract:

GPS satellites antenna PCO(phase center offset) and PCV(phase center variation) were reestimated based on station coordinates under different reference frames. The correlations among GPS satellite antenna parameters, receiver antenna parameters and reference frame scales were reduced by fixing receiver antenna PCO/PCV and constraining station coordinate to given reference frame tightly. Results show that the mean difference of blockspecific satellite antenna PCV based on different reference frames is 0.726 mm. Comparing with the satellite antenna PCV released by IGS based on IGS00, the mean blockspecific PCV difference between IGS value and the reestimated is 0.844 mm. Comparing to the IGS values, GPS reestimated satellite antenna PCO has an average bias of -14.4 mm and -16.8 mm for the reestimated satellite antenna PCO based on IGS14 and IGS08, respectively. The reestimated PCO/PCV values could improve their inerconsistency and contribute to the GNSS based reference frames densification.

Key words:satellite antenna; phase center offset; phase center variation; calibration; reference frame; datum transformation