The GNSS measurements are strongly affected by ionospheric effects, due to the signal propagation through ionosphere; these\r\neffects could severely degrade the position; hence, a model to limit or remove the ionospheric error is necessary. The use of\r\nseveral techniques (DGPS, SBAS, and GBAS) reduces the ionospheric effect, but implies the use of expensive devices and/or\r\ncomplex architectures necessary to meet strong requirements in terms of accuracy and reliability for safety critical application. The\r\ncheapest and most widespread GNSS devices are single frequency stand-alone receivers able to partially correct this kind of error\r\nusing suitable models. These algorithms compute the ionospheric delay starting from ionospheric model, which uses parameters\r\nbroadcast within the navigation messages. NeQuick is a three-dimensional and time-dependent ionospheric model adopted by\r\nGalileo, the European GNSS, and developed by International Centre for Theoretical Physics (ICTP) together with Institute for\r\nGeophysics, Astrophysics, and Meteorology of the University of Graz. The aim of this paper is the performance assessment in\r\nsingle point positioning of the NeQuick Galileo version provided by ESA and the comparison with respect to the Klobucharmodel\r\nused for GPS; the analysis is performed in position domain and the errors are examined in terms of RMS and maximum error for\r\nthe horizontal and vertical components. A deep analysis is also provided for the application of the exanimated model in the first\r\npossible Galileo only position fix.
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