Two methods to determine scale-independent GPS PCOs and GNSS-based terrestrial scale: comparison and cross-check

dc.contributor.authorHuang, Wen
dc.contributor.authorMännel, Benjamin
dc.contributor.authorBrack, Andreas
dc.contributor.authorSchuh, Harald
dc.date.accessioned2020-11-06T07:40:33Z
dc.date.available2020-11-06T07:40:33Z
dc.date.issued2020-10-12
dc.description.abstractThe GPS satellite transmitter antenna phase center offsets (PCOs) can be estimated in a global adjustment by constraining the ground station coordinates to the current International Terrestrial Reference Frame (ITRF). Therefore, the derived PCO values rest on the terrestrial scale parameter of the frame. Consequently, the PCO values transfer this scale to any subsequent GNSS solution. A method to derive scale-independent PCOs without introducing the terrestrial scale of the frame is the prerequisite to derive an independent GNSS scale factor that can contribute to the datum definition of the next ITRF realization. By fixing the Galileo satellite transmitter antenna PCOs to the ground calibrated values from the released metadata, the GPS satellite PCOs in the z-direction (z-PCO) and a GNSS-based terrestrial scale parameter can be determined in GPS + Galileo processing. An alternative method is based on the gravitational constraint on low earth orbiters (LEOs) in the integrated processing of GPS and LEOs. We determine the GPS z-PCO and the GNSS-based scale using both methods by including the current constellation of Galileo and the three LEOs of the Swarm mission. For the first time, direct comparison and cross-check of the two methods are performed. They provide mean GPS z-PCO corrections of −186±25 mm and −221±37 mm with respect to the IGS values and +1.55±0.22 ppb (parts per billion) and +1.72±0.31 in the terrestrial scale with respect to the IGS14 reference frame. The results of both methods agree with each other with only small differences. Due to the larger number of Galileo observations, the Galileo-PCO-fixed method leads to more precise and stable results. In the joint processing of GPS + Galileo + Swarm in which both methods are applied, the constraint on Galileo dominates the results. We discuss and analyze how fixing either the Galileo transmitter antenna z-PCO or the Swarm receiver antenna z-PCO in the combined GPS + Galileo + Swarm processing propagates to the respective freely estimated z-PCO of Swarm and Galileo.en
dc.identifier.eissn1521-1886
dc.identifier.issn1080-5370
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/11843
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-10733
dc.language.isoenen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subject.ddc550 Geowissenschaftende
dc.subject.otherGNSSen
dc.subject.otherPCOen
dc.subject.otherGalileoen
dc.subject.otherterrestrial scaleen
dc.subject.otherLEOsen
dc.titleTwo methods to determine scale-independent GPS PCOs and GNSS-based terrestrial scale: comparison and cross-checken
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.articlenumber4en
dcterms.bibliographicCitation.doi10.1007/s10291-020-01035-5en
dcterms.bibliographicCitation.journaltitleGPS Solutionsen
dcterms.bibliographicCitation.originalpublishernameSpringeren
dcterms.bibliographicCitation.originalpublisherplaceBerlin [u.a.]en
dcterms.bibliographicCitation.volume24en
tub.accessrights.dnbfreeen
tub.affiliationFak. 6 Planen Bauen Umwelt::Inst. Geodäsie und Geoinformationstechnik::FG Satellitengeodäsiede
tub.affiliation.facultyFak. 6 Planen Bauen Umweltde
tub.affiliation.groupFG Satellitengeodäsiede
tub.affiliation.instituteInst. Geodäsie und Geoinformationstechnikde
tub.publisher.universityorinstitutionTechnische Universität Berlinen

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