文章基本信息

标题：Fibre-optic delivery of time and frequency to VLBI station
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作者：P. Krehlik ; P. Krehlik ; Ł. Buczek 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2017
卷号：603
页码：1-8
DOI：10.1051/0004-6361/201730615
语种：English
出版社：EDP Sciences
摘要：The quality of Very Long Baseline Interferometry (VLBI) radio observations predominantly relies on precise and ultra-stable time and frequency (T&F) standards, usually hydrogen masers (HM), maintained locally at each VLBI station. Here, we present an operational solution in which the VLBI observations are routinely carried out without use of a local HM, but using remote synchronization via a stabilized, long-distance fibre-optic link. The T&F reference signals, traceable to international atomic timescale (TAI), are delivered to the VLBI station from a dedicated timekeeping laboratory. Moreover, we describe a proof-of-concept experiment where the VLBI station is synchronized to a remote strontium optical lattice clock during the observation.
关键词：eninstrumentation: high angular resolutioninstrumentation: interferometers