Orbital Artifacts in Multi‐GNSS Precise Point Positioning Time Series

Abstract The time series of station coordinates derived using Global Navigation Satellite Systems (GNSS) are affected by several technique errors, influencing the studies geophysical processes and phenomena. Using different GNSS constellations leads to appearance various artificial signals with amplitudes up millimeters. presence system‐specific artifacts is demonstrated 2‐year long zenith total delay parameters for 15 stations Precise Point Positioning algorithms. most dominant orbital Galileo appear periods 14.08 hr, 17.09 34.20 2.49 days, ∼3.4 days. corresponding GLONASS 5.63 7.36 10.64 21.26 3.99 ∼8 Moreover, when estimating discrete 24‐hr solutions from high‐rate data, high‐frequency signatures under‐sampled, resulting in long‐term aliased periodic signals. less vulnerable than GPS or GLONASS. difference visible mainly East coordinate. Galileo‐based daily estimates 55% 36% better those delivered GPS. arise at harmonics K 1 tide, which inconsistency GPS‐based products models reaching on average 12 mm 2 tidal term Up component. magnitude depends geographical location geometry satellites' flybys. Finally, a combination increases precision 10% compared best‐case Galileo‐only solution.