Evaluation of timing and time transfer with PPP using Galileo High Accuracy Service

Abstract

The Galileo High Accuracy Service (HAS) provides free corrections for real-time precise point positioning (PPP) worldwide. PPP can provide high-stability time dissemination and remote clock comparisons, and consequently is widely adopted in time metrology. We collected HAS data of 134 days to present a comprehensive performance evaluation in timing and time transfer. Concerning the signal-in-space range error (SISRE), HAS corrections reach orbital/total root mean square errors (RMSE) of 3.0/6.0 cm and 4.2/13.7 cm for Galileo and GPS, respectively. The timing results show overlapping Allan deviation (OADEV) values 1 · 10-12–5 · 10-15 for Galileo and 4 · 10-12–1 · 10-14 for GPS, for intervals 30–100,000 s, and RMSE of PPP timing 1.9 ns and 1.4 ns for Galileo and GPS, respectively. For remote clock comparisons, the OADEV values are 5 · 10-13–5 · 10-15 for Galileo and 7 · 10-13–4 · 10-15 for GPS.