Assessing the contribution of Galileo to GPS plus GLONASS PPP: Towards full operational capability

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dc.contributor.authorOgutcu, Sermet
dc.date.accessioned2024-02-23T14:13:10Z
dc.date.available2024-02-23T14:13:10Z
dc.date.issued2020
dc.departmentNEÜen_US
dc.description.abstractBy the end of 2018, the Galileo constellation consisted of four in-orbit validation (IOV) satellites and 22 full operational capability (FOC) satellites. Except for GPS and GLONASS, the FOC of Galileo has not been reached. In 2018, four Galileo FOC satellites were launched. With these launches, most of the Galileo FOC has been reached. In this paper, the latest contribution of the Galileo constellation to GPS+GLONASS combined Multi-GNSS precise point positioning (PPP) solutions is analyzed in terms of static/kinematic accuracy and convergence time. Three different elevation cut-off angles (5 degrees,-15 degrees,-30 degrees) are chosen to simulate the ideal and restricted satellite visibilities. A two-month period and a one-week period in 2019 are chosen for conducting static and kinematic PPP, respectively, using the data of 20 Multi-GNSS Experiment (MGEX) stations. Non-overlapping sessions of 24, 12, 6, 3, 1, and 0.5 h within two months are processed for static PPP to analyze the effect of the Galileo contribution to static PPP for each observation length and cut-off angle. GipsyX scientific software developed by NASA's Jet Propulsion Laboratory (JPL) is used for PPP processes. The statistical results show that the contribution of Galileo generally becomes higher as the observing sessions become shorter, but no significant correlation between the contribution of Galileo and observing session is found for each station. The largest horizontal and vertical accuracy improvements of Galileo are observed as 8 mm/11 mm (47%/61%) and 23 mm/30 mm (20%/48%) for static and kinematic PPP, respectively. The accuracy degradation is observed more in the vertical component for some stations when adding Galileo to GPS+GLONASS combined static and kinematic PPP. The Galileo contributions to minimum, maximum, and mean convergence times are also computed for both static and kinematic PPP. The largest improvement show that mean horizontal and vertical convergence times are shortened by 24 min/24 min (52%/45%) and 61 min/23 min (89%/62%) for static and kinematic PPP, respectively. The results also show that outliers can be reduced significantly for most of the stations by adding Galileo to the GPS+GLONASS combined PPP for short observation sessions. (C) 2019 Elsevier Ltd. All rights reserved.en_US
dc.identifier.doi10.1016/j.measurement.2019.107143
dc.identifier.issn0263-2241
dc.identifier.issn1873-412X
dc.identifier.scopus2-s2.0-85073681976en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.urihttps://doi.org/10.1016/j.measurement.2019.107143
dc.identifier.urihttps://hdl.handle.net/20.500.12452/12336
dc.identifier.volume151en_US
dc.identifier.wosWOS:000500942200083en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherElsevier Sci Ltden_US
dc.relation.ispartofMeasurementen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectGpsen_US
dc.subjectGlonassen_US
dc.subjectGalileoen_US
dc.subjectPppen_US
dc.subjectMgexen_US
dc.titleAssessing the contribution of Galileo to GPS plus GLONASS PPP: Towards full operational capabilityen_US
dc.typeArticleen_US

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