Objectives The ground calibrated antenna phase center offset (PCO) and phase center variation (PCV) for European global navigation satellite Galileo have been released. Compared with in-orbit estimated PCO and PCV, the calibrated counterparts are frequency-dependent and satellite-dependent. The characteristics of calibrated satellite antenna parameters are needed to be analyzed.
Methods Firstly, we compare the antenna parameter of different type satellites, in-orbit validation (IOV) satellite and full operational capability (FOC) satellite. Secondly, we use data from 20 MGEX (multi-GNSS experiment) stations for 15 consecutive days, the effects of calibrated antenna parameters on dual-frequency combined/uncombined precise point positioning (PPP) are studied.
Results Experiment results show that the horizontal PCO (h-PCO) are type-dependent, PCV of FOC satellite are more stable than those of IOV satellite and only dependent on the nadir angle. Compared with the positioning results of estimated antenna parameters, the positioning accuracy in horizontal direction is equivalent. The height accuracy based on ionospheric-free combination observation is improved by about 6.3%, those based on dual-frequency uncombined observation is improved by about 11.9%.
Conclusions The calibrated antenna parameters based on the individual frequency show better self-consistency in dual-frequency uncombined PPP.
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