Comparing remote atomic clocks via VLBI networks and fiber optic links: the LIFT/MetGeSp perspective
Journal
Date Issued
2018
Author(s)
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Ambrosini, R.
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Calonico, D.
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Clivati, C.
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Tampellini, A.
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Levi, F.
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Bianco, G.
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Siciliani de Cumis, M.
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Santamaria Amato, L.
Abstract
Very Long Baseline Interferometry experiments require an extremely precise synchronization
between the atomic clocks keeping the time and frequency standards at radiotelescope observatories. Recently the availability of fiber optic links from a few radio observatories and their
national metrological institutes has made possible the streaming of extremely stable frequency
standards via optical atomic clocks (even two order of magnitudes better than Rubidium or Hydrogen maser standards). Firstly, I will present the infrastructure of the Italian Link for Frequency
and Time (LIFT) and results of the MetGesp project aimed at finally creating a common clock
between two of the antennas of the VLBI Italian Network. Secondly, I will show the results of
VLBI experiments in which the phase rms noise was used to accurately compare the synchronicity of atomic clocks located at a few EVN sites (Medicina, Noto, Yebes, Torun). VLBI clock
timing proves a valid alternative to satellite-based techniques such as Global Navigation Satellite
System or Two-Way Satellite Frequency and Time Transfer.
Coverage
14th European VLBI Network Symposium & Users Meeting (EVN 2018)
Start page
83
Conferenece
14th European VLBI Network Symposium & Users Meeting EVN2018
Conferenece place
Granada, Spain
Conferenece date
8-11 October, 2018
Issn Identifier
1824-8039
Ads BibCode
2018evn..confE..83R
Rights
open.access
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