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Exploiting Galileo Ionospheric Disturbance Flags to boost NeQuick

The European Commission has recently released the official document describing the particular ionospheric model developed for the Galileo satellite navigation system. Such publication allows GNSS receiver manufacturers starting the implementation of the specific algorithm targeted for their Galileo related products in order to be compliant with the Galileo system. According to the European GNSS (Galileo) Open Service Signal In Space Interface Control Document, Issue 1.1, among the parameters that are broadcast in the Galileo navigation message, one can find five Ionospheric Disturbance Flags for Regions 1 to 5 (SF1, SF2, SF3, SF4 and SF5 respectively). Nevertheless, in the current version of the model presented in the Galileo-Iono document, the Ionospheric Disturbance flags are not used within the Galileo ionospheric correction calculation. In this work, a potential approach to account for this information is being investigated. This approach includes the update of the Galileo ionospheric correction model, NeQuick-G, by specifying the use of these flags. Hence a customized version of the NeQuick-G model has been developed and tested.