Galileo Data Signals: Enabling Fast-TTFF and Flexibility with the GeoFocus and GNSE Schemes
J.A. Garcia-Molina, S. Wallner, J. Miguez, J. Parro, F.T. Melman, C. Vazquez Alocen, G. Da Broi, G. Lopez-Risueno, European Space Agency (ESA/ESTEC); V. Lucas-Sabola, I.P. Peppa, O. Cervelló i Nogués, F. Formaggio, F. Soualle, J.J. Floch, Airbus Defence and Space GmbH; D. Peron, F. Pattaro, M. Ceccato, F. Moretto, Qascom Srl
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The availability of signal components easing the acquisition process, supporting the fast time retrieval, and providing some navigation data to derive a first position fix within few seconds, is of interest for applications targeting accuracies in the order of few meters and relying only on the broadcast GNSS data. This paper presents the Data signal design concepts being considered in the context of Galileo signal evolution activities. In particular, the paper discusses how the spatial transmission diversity provided by multiple Galileo satellites in view by a receiver can be exploited to enable a fast time-to-first-fix (TTFF) even in urban propagation conditions. Additionally, the paper discusses how data flexibility can be provided in order to support future services.
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