The Galileo Open Service Navigation Message Authentication (OSNMA): the New Global Authentication Service

J. Simon, T. Rodriguez, A. Alvarez, L. de Filippis, P. da Silva, F. Sbardellati, I. Fernandez-Hernandez, S. Damy, G. Caparra

Abstract:	This paper presents the recently declared new Galileo OSNMA service. It describes its roadmap implemented till reaching the Initial Service declaration, and its main design elements, focusing on the Service Definition Document (SDD). The paper also presents the performance achieved in terms of availability over the last months as compared to the commitment from the SDD, and the market status at the time of the OSNMA Initial Service declaration. Its main purpose is to provide a full overview of OSNMA as it currently stands, and the references to implement OSNMA-capable receivers and applications following the OSNMA Initial Service declaration.
Published in:	Proceedings of the 38th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2025) September 8 - 12, 2025 Hilton Baltimore Inner Harbor Baltimore, Maryland
Pages:	862 - 877
Cite this article:	Simon, J., Rodriguez, T., Alvarez, A., de Filippis, L., Silva, P. da, Sbardellati, F., Fernandez-Hernandez, I., Damy, S., Caparra, G., "The Galileo Open Service Navigation Message Authentication (OSNMA): the New Global Authentication Service," Proceedings of the 38th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2025), Baltimore, Maryland, September 2025, pp. 862-877. https://doi.org/10.33012/2025.20403
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