Galileo Timing for R-Mode – Testing Campaign

G. Cueto-Felgueroso, J. Martínez, S. Blesa, G. Moreno, M. López, R. Nieto, R. Píriz, M. Hoppe, S. Gewies, K. Callewaert, M. López

Abstract: R-Mode (Ranging Mode) technology is being developed in the frame of maritime community as a terrestrial backup positioning and timing system for maritime usage. R-Mode allows calculating user receiver position in relation to synchronized fixed-shore radio transmitters. The synchronization of the R-Mode transmitter sites is crucial for the R-Mode performance. Current implementations, especially in the Baltic Sea, use GPS stabilized atomic clocks to ensure accurate station timing and hold-over capabilities in case of GPS unavailability. Using GNSS for time synchronization is a cost-effective approach to setup R-Mode as a backup system that allows positioning and timing. In the frame of GSALOT3TRANS framework contract (Specific Contract 10) from EUSPA (European Union Agency for the Space Program), a pilot project has been carried out in order to operationally analyse the suitability and performance of Galileo Timing for R-Mode transmission infrastructure synchronization. The industrial partners of this specific contract are VVA Brussels (prime) and GMV in close coordination with R-Mode Baltic project key partners (specifically WSV and DLR). Three MF R-Mode stations from WSV were upgraded to include a calibrated Galileo-based timing solution based on a timing product developed by GMV, which generates a precise and accurate 1 PPS and 10 MHz time signal as an alternative to the GPS-only current approach used as timing source. The R-Mode user receiver equipment (developed from DLR) within the coverage area of R-Mode transmitting sites was also upgraded to take benefit of Galileo. Transmission stations and receiver at “user level” are key modules of the performance analysis of Galileo timing test campaign. The aim of this paper is to present the detailed system configuration, tests, achieved measurements and conclusions output of the Galileo Timing for R-Mode Pilot performed between the end of 2021 and beginning of 2022.
Published in: Proceedings of the 35th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2022)
September 19 - 23, 2022
Hyatt Regency Denver
Denver, Colorado
Pages: 439 - 456
Cite this article: Cueto-Felgueroso, G., Martínez, J., Blesa, S., Moreno, G., López, M., Nieto, R., Píriz, R., Hoppe, M., Gewies, S., Callewaert, K., López, M., "Galileo Timing for R-Mode – Testing Campaign," Proceedings of the 35th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2022), Denver, Colorado, September 2022, pp. 439-456.
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