Intercontinental Comparison of Lattice Clocks Using a Broadband VLBI Technique
Date Issued
2019
Author(s)
Ido, T.
•
Hachisu, H.
•
Nemitz, N.
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Takefuji, K.
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Ujihara, H.
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Kawai, E.
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Ishijima, H.
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Tsusumi, M.
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Ichikawa, R.
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Sekido, M.
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Pizzocaro, M.
•
Bregolin, F.
•
Barbieri, P.
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Levi, F.
•
Clivati, C.
•
Cerretto, G.
•
Calonico, D.
•
•
•
•
•
•
•
Mura, Alberto
Abstract
We performed a frequency comparison of lattice clocks in Tokyo and Torino for the first time using broadband VLBI technique. Two portable antennas with 2.4 m diameters were installed at NICT Koganei headquarters and INAF Medicina Radio Observatory, close to Bologna, Italy, realizing a VLBI network together with Kashima large-aperture antenna of 34 m diameter. The clock signal at INAF was evaluated by INRIM using an optical fiber link between Medicina and Torino. The fractional frequency difference that VLBI evaluated was consistent with the difference between two HM frequencies which were separately calibrated by a Sr lattice clock at NICT and a Yb lattice clock at INRIM.
Coverage
2019 Joint Conference of the IEEE International Frequency Control Symposium and European Frequency and Time Forum (EFTF/IFC)
Start page
1
Conferenece
2019 Joint Conference of the IEEE International Frequency Control Symposium and European Frequency and Time Forum (EFTF/IFC)
Conferenece place
Orlando, FL, USA, USA
Conferenece date
14-18 April, 2019
Issn Identifier
2327-1949
Rights
open.access
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