Characterization and evaluation of GPS PPP techniques for optical clock comparisons

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dc.identifier.uri http://dx.doi.org/10.15488/3301
dc.identifier.uri http://www.repo.uni-hannover.de/handle/123456789/3331
dc.contributor.author Leute, Julia ger
dc.date.accessioned 2018-05-17T09:45:41Z
dc.date.available 2018-05-17T09:45:41Z
dc.date.issued 2018
dc.identifier.citation Leute, Julia: Characterization and evaluation of GPS PPP techniques for optical clock comparisons. Hannover : Gottfried Wilhelm Leibniz Universität, Diss., 2018, xi, 91 S. DOI: https://doi.org/10.15488/3301 ger
dc.description.abstract The suitability of an improved GPS time and frequency transfer technique, Integer Precise Point Positioning (IPPP), for the frequency comparison of optical clocks on the 1e−16 level was investigated. An optical fiber link established between Physikalisch-Technische Bundesanstalt (PTB) and Laboratoire national de métrologie et d’essais - Système de Références Temps-Espace (LNE-SYRTE), which due to its superior stability and accuracy serves as the ground truth, was used to characterize the PPP and IPPP links between both institutes. For two different GPS stations at LNE-SYRTE, the agreement between the IPPP link and the optical fiber link was (−0.34 ± 2.66)e-16 and (−0.23 ± 0.57)e−16 for an averaging time of 1.2e6 s and 0.9e6 s respectively. Direct remote frequency comparisons of 171-Yb ion clocks developed at PTB and National Physical Laboraty (NPL) via IPPP links were performed. The impact of frequent dead time due to the limited duty cycle of the clocks on the statistical uncertainty of the clock comparison via GPS link was studied. A method to optimize the statistical uncertainty of the clock comparison was applied that uses flywheel oscillators to bridge the frequent dead time. The average fractional frequency deviation of the clocks based on the electric quadrupole transition in the 171-Yb ion was y(PTB)−y(NPL)=(−1.46 ± 0.55)e−15 including the systematic uncertainties of the optical clocks. A systematic frequency offset, not accounted for in the systematic uncertainty budgets was observed. For the clocks based on the electric octupole transition, the average fractional frequency deviation was y(PTB)−y(NPL)=(−0.1 ± 3.1)e−16, no systematic frequency offset was observed. ger
dc.language.iso ger ger
dc.publisher Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
dc.rights CC BY 3.0 DE ger
dc.rights.uri http://creativecommons.org/licenses/by/3.0/de/ ger
dc.subject frequency transfer eng
dc.subject GPS eng
dc.subject Precise Point Positioning eng
dc.subject optical clock eng
dc.subject Frequenztransfer ger
dc.subject GPS ger
dc.subject Precise Point Positioning ger
dc.subject Optische Uhr ger
dc.subject.ddc 530 | Physik ger
dc.title Characterization and evaluation of GPS PPP techniques for optical clock comparisons eng
dc.type doctoralThesis ger
dc.type Text ger
dc.description.version publishedVersion ger
tib.accessRights frei zug�nglich ger


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