Assessment of NeQuick ionospheric model for Galileo single-frequency users

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TitleAssessment of NeQuick ionospheric model for Galileo single-frequency users
Publication TypeJournal Article
Year of Publication2013
AuthorsAngrisano, A, Gaglione, S, Gioia, C, Massaro, M, Robustelli, U
JournalActa Geophysica
Volume61
Issue6
Pagination1457-1476
Date Published12/2013
Type of ArticleResearch Article
ISSN1895-6572
KeywordsGalileo, GNSS, ionospheric models, Klobuchar, NeQuick
Abstract

 In signal-degraded environments such as urban canyons and mountainous area, many GNSS signals are either blocked or strongly degraded by natural and artificial obstacles. In suchscenarios standalone GPS is often unable to guarantee a continuous and accurate positioning due to lack (or the poor quality) of signals. The combination of different GNSSs could be asuitable approach to fill this gap, because the multi-constellation system guarantees an improved satellite availability compared to standalone GPS, thus providing enhanced accuracy, continuity and integrity of the positioning. The present GNSSs are GPS, GLONASS, Galileo and Beidou, but the latter two are still in the development phase. In this work GPS/GLONASS systems are combined for single point positioning and their performance are assessed for different configurations. Using GPS/GLONASS multi-constellation implies the addition of an additional unknown, i.e. the intersystem time scale offset, which requires a sacrifice of one measurement.Since the intersystem offset is quasi-constant over a short period, a pseudo-measurement can be introduced to compensate the sacrifice.The benefit after adding a pseudo-measurement has been demonstrated in a vehicular test.

URLhttp://dx.doi.org/10.2478/s11600-013-0116-2
DOI10.2478/s11600-013-0116-2
How to citate: 
Angrisano, Antonio, Gaglione, Salvatore, Gioia, Ciro, Massaro, Marco, Robustelli, Umberto (2013). Assessment of NeQuick ionospheric model for Galileo single-frequency users. Acta Geophysica, 1457-1476 , ISSN:1895-6572 doi: 10.2478/s11600-013-0116-2