NDLI: T2L2: Five years in space

Content Provider	IEEE Xplore Digital Library
Author	Exertier, P. Samain, E. Courde, C. Martin, N. Torre, J.-M. Oneto, J.-L. Laas-Bourez Geoazur, M. Guillemot, P. Leon, S.
Copyright Year	2013
Description	Author affiliation: CNES, French Space Agency, Toulouse, France (Guillemot, P.; Leon, S.) \|\| Obs. de la Cote d'Azur, Univ. de Nice Sophia-Antipolis, Valbonne, France (Exertier, P.; Samain, E.; Courde, C.; Martin, N.; Torre, J.-M.; Oneto, J.-L.; Laas-Bourez Geoazur, M.)
Abstract	The Time Transfer by Laser Link (T2L2) experiment aims to synchronize remote ultra stable clocks over very long distances using the Satellite Laser Ranging (SLR) technique. T2L2 was launched in July 2008, on board the Jason2 satellite; from 5-6 stations ranging T2L2 during the first months of the mission, around 22 stations of the worldwide SLR network are now participating in the tracking. In addition to the permanent data acquisition and processing (accessible from our website https://t2l2.oca.eu/), several field experiments have been conducted to alternatively demonstrate the ultimate time transfer capability of T2L2, in terms of stability, exactness, comparison with the GPS and Two-Way microwave techniques. This paper synthetizes the best performances that T2L2 allows us to achieve, as a result of recent improvements made in the data reduction. The time stability of the T2L2 ground to space time transfer is established at 6-8 ps at 75 seconds, for SLR systems equipped with an H-maser as the reference clock. The ground to ground time transfer stability between 2 SLR stations (in Common View) is estimated at 11 ps rms (average) over one passage and better than 50 ps over several days. We present also the advantages and drawbacks of this unique time transfer technique based on an optical link.
Sponsorship	IEEE Ultrason., Ferroelectr., Freq. Control Soc.
Starting Page	632
Ending Page	635
File Size	591550
Page Count	4
File Format	PDF
DOI	10.1109/EFTF-IFC.2013.6702281
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-07-21
Publisher Place	Czech Republic
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Space vehicles Laser ranging Space technique Time-frequency analysis Satellites Time transfer Laser stability Extraterrestrial measurements Distance measurement Clocks
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Prospective Performance Budget of the T2L2 Experiment

Analysis of Time and Frequency Error in Dual-One-Way Ranging

Time Transfer by Laser Link: The T2L2 experiment on Jason 2

Research on inter-satellite ranging and velocity measurement method based on Doppler frequency measurement

Combination of T2L2 and GPS-CP Data: Towards an improvement of Time Transfer accuracy

Time and frequency requirements for geodetic space techniques

System requirements for satellite laser ranging time transfer

A sub-ns comparison between GPS common view and T2L2

Measurements and analysis of the frequency stability of GPS Navstar clocks

T2L2: Five years in space

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T2L2: Five years in space