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Time transfer by laser link (T2L2): characterization and calibration of the flight instrument

Samain, Etienne and Vrancken, Patrick and Guillemot, Philippe and Fridelance, Patricia and Exertier, Pierre (2014) Time transfer by laser link (T2L2): characterization and calibration of the flight instrument. Metrologia, 51 (5), pp. 503-515. Institute of Physics (IOP) Publishing. ISSN 0026-1394

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Official URL: http://dx.doi.org/10.1088/0026-1394/51/5/503


The T2L2 project (time transfer by laser link) allows for the synchronization of remote ultra-stable clocks over intercontinental distances. The principle is derived from satellite laser ranging technology with dedicated space equipment designed to record arrival times of laser pulses at the satellite. The space segment has been launched in June 2008 as a passenger experiment on the ocean altimetry satellite Jason 2. T2L2 had been specified to yield a time stability of better than 1 ps over 1000 s integration time and an accuracy of better than 100 ps. This level of performance requires a rigorous data processing which can be performed only with a comprehensive calibration model of the whole instrumentation. For this purpose, several experimental measurements have been performed before and during the integration phase of the T2L2 space instrument. This instrument model is one of the cornerstones of the data reduction process which is carried out to translate the raw information to a usable picosecond time transfer. After providing a global synopsis of the T2L2 space instrument, the paper gives a description of the experimental setup for the instrument characterization. It then details the different contributions within the calibration model and concludes with an applied example of a space to ground time transfer.

Item URL in elib:https://elib.dlr.de/91979/
Document Type:Article
Title:Time transfer by laser link (T2L2): characterization and calibration of the flight instrument
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Samain, EtienneOCA, GeoAzurUNSPECIFIED
Guillemot, PhilippeCNESUNSPECIFIED
Fridelance, PatriciaPhusipus IntégrationUNSPECIFIED
Exertier, PierreOCA, GeoAzurUNSPECIFIED
Date:19 August 2014
Journal or Publication Title:Metrologia
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 503-515
Publisher:Institute of Physics (IOP) Publishing
Keywords:time transfer, clocks, photodetection, event timer, laser, laser ranging
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben LIDAR-Forschung und -Entwicklung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Deposited By: Vrancken, Dr. Patrick
Deposited On:19 Nov 2014 11:29
Last Modified:06 Sep 2019 15:20

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