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Ground-based demonstration of the European Laser Timing (ELT) experiment.
MedLine Citation:
PMID:  20211794     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
The development of techniques for the comparison of distant clocks and for the distribution of stable and accurate time scales has important applications in metrology and fundamental physics research. Additionally, the rapid progress of frequency standards in the optical domain is presently demanding additional efforts for improving the performances of existing time and frequency transfer links. Present clock comparison systems in the microwave domain are based on GPS and two-way satellite time and frequency transfer (TWSTFT). European Laser Timing (ELT) is an optical link presently under study in the frame of the ESA mission Atomic Clock Ensemble in Space (ACES). The on-board hardware for ELT consists of a corner cube retro-reflector (CCR), a single-photon avalanche diode (SPAD), and an event timer board connected to the ACES time scale. Light pulses fired toward ACES by a laser ranging station will be detected by the SPAD diode and time tagged in the ACES time scale. At the same time, the CCR will re-direct the laser pulse toward the ground station providing precise ranging information. We have carried out a ground-based feasibility study at the Geodetic Observatory Wettzell. By using ordinary satellites with laser reflectors and providing a second independent detection port and laser pulse timing unit with an independent time scale, it is possible to evaluate many aspects of the proposed time transfer link before the ACES launch.
Authors:
Karl Ulrich Schreiber; Ivan Prochazka; Pierre Lauber; Urs Hugentobler; Wolfgang Sch?fer; Luigi Cacciapuoti; Rosario Nasca
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  IEEE transactions on ultrasonics, ferroelectrics, and frequency control     Volume:  57     ISSN:  1525-8955     ISO Abbreviation:  IEEE Trans Ultrason Ferroelectr Freq Control     Publication Date:  2010 Mar 
Date Detail:
Created Date:  2010-03-09     Completed Date:  2010-06-18     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882735     Medline TA:  IEEE Trans Ultrason Ferroelectr Freq Control     Country:  United States    
Other Details:
Languages:  eng     Pagination:  728-37     Citation Subset:  -    
Affiliation:
Forschungseinrichtung Satellitengeodaesie, Technische Universitaet Muenchen, Geodaetisches Observatorium Wettzell, Bad Koetzting, Germany. ulrich.schreiber@bv.tum.de
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