PPP Augmentation Based on GEO-E5b Signal

David Calle, Irma Rodríguez, Guillermo Tobías, Julián Barrios, José Gabriel Pericacho, Javier Arenas

Abstract:	SBAS services are currently mainly focused on providing services for the aviation community and to users with accuracy needs in the sub-metric range. Nonetheless, the SBAS providers are approaching new markets and for that, expanding the portfolio of services and capabilities offered is considered a must. Existing SBAS services employ the L1 signals for Safety of Life and Open Service provision and in the future the L5/E5a for the Dual-Frequency Multi-constellation (DFMC) service. The bandwidth available in these two frequencies is mostly committed with the mentioned services, hence in order to add new features new dissemination means are required. Two options are being employed or studied: on the first hand, the internet channel, which is considered a nominal evolution of the service to get rid of the Signal in Space (SIS) bandwidth limitations, but on the other hand there is a clear need of increasing the SIS bandwidth for additional services. In this regard, the option under study by different institutions is to add and standardise the use of a new signal, the E5b (1189 – 1214 MHz). The E5b is a new signal for SBAS services, but not new for GNSS, as it is already being exploited in the Galileo mission and will be used by GLONASS L3 CDMA signals. In this sense, the E5b channel has certain advantages that make it a good candidate for extending the SBAS service. The main advantage is the fact that most high-end receivers available in the market are ready to track the E5b channel in terms of hardware. But this statement is also applicable for many mass-market receivers, clear examples are theUblox F9 series, the ST Teseo V or the Septentrio Mosaic. Most of these high-end and mass-market receivers may support SBAS E5b just with a firmware upgrade. There is a key step to be taken for the usage of the new signal, which is a trade-off between the services to be provided, the bandwidth required for those services and, as result, the potential definitions of the E5b signal characteristics. One of the services intended by different institutions (e.g.: European Commission, Geoscience Australia) in the last years is the provision of High Accuracy (HA) corrections through the E5b. Considering that this HA service will be one of the most bandwidth demanding, the role in the trade-off is of high importance. Within this paper, the dissemination needs for a HA service will be reviewed and, based on the outcomes, a candidate definition for the E5b-HA service will be proposed. In addition, the dissemination strategy is also a key driver to obtain the best possible performance, without disregarding the needed flexibility in the dissemination scheme to accommodate other potential services. Hence, different strategies to optimize the performances at user level based on different HA data update rates will be investigated so that the candidate dissemination configuration can be consolidated. Finally, the proposed messaging scheme and the dissemination strategy will be experimentally evaluated at user level in terms of reception and positioning performances.
Published in:	Proceedings of the 34th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2021) September 20 - 24, 2021 Union Station Hotel St. Louis, Missouri
Pages:	453 - 473
Cite this article:	Calle, David, Rodríguez, Irma, Tobías, Guillermo, Barrios, Julián, Pericacho, José Gabriel, Arenas, Javier, "PPP Augmentation Based on GEO-E5b Signal," Proceedings of the 34th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2021), St. Louis, Missouri, September 2021, pp. 453-473. https://doi.org/10.33012/2021.17893
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