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Updated: May 15, 2026
12:14
The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
Published on: August 12, 2013
On the potential of Galileo E5 for time transfer
Mari Carmen Martínez-Belda1, Pascale Defraigne, Carine Bruyninx
1Applied Mathematics Department, University of Alicante, Alicante, Spain. carmen.martinez@ua.es
Summary
New Galileo E5 signal analysis shows potential for improved Global Navigation Satellite System (GNSS) time transfer. However, current methods using the E5 code-plus-carrier combination do not yet enhance medium- and long-term stability.
Area of Science:
- Geodesy
- Satellite Navigation
- Metrology
Background:
- Current Global Navigation Satellite System (GNSS) time transfer relies on ionosphere-free combinations of dual-frequency measurements in Precise Point Positioning (PPP) mode.
- Frequency stability is limited by noise and multipath errors in Global Positioning System (GPS) and GLONASS codes.
- Galileo's upcoming E5 signal offers low noise and multipath characteristics, promising advancements.
Purpose of the Study:
- Investigate new analysis procedures for GNSS time transfer using Galileo's E5 signal.
- Evaluate the performance of the E5 code-plus-carrier (CPC) combination for time transfer applications.
- Assess the potential of E5 CPC for improving GNSS time transfer stability.
Main Methods:
- Analysis of ionosphere-free combinations of dual-frequency code and carrier phase measurements in PPP mode.
- Utilized simulated Galileo data for testing new analysis procedures.
- Examined the E5 code-plus-carrier (CPC) combination for time transfer.
Main Results:
- The E5 CPC combination demonstrates a noise level 10 times lower than the ionosphere-free combination of Galileo E1 and E5.
- Simulated data tests indicate that the E5 CPC combination does not currently improve medium- and long-term time transfer stability.
- The need for a second frequency signal to correct ionospheric delays and ambiguities remains a limiting factor.
Conclusions:
- The Galileo E5 signal and CPC combination show promise for reducing noise in GNSS time transfer.
- Further research is needed to overcome limitations related to ionospheric corrections for improved stability.
- Advancements in GNSS time transfer performance are anticipated with future developments.
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