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Square Kilometre Array Telescope--Precision Reference Frequency Synchronisation
via 1f-2f Dissemination
#MMPMID26349544
Wang B
; Zhu X
; Gao C
; Bai Y
; Dong JW
; Wang LJ
Sci Rep
2015[Sep]; 5
(?): 13851
PMID26349544
show ga
The Square Kilometre Array (SKA) project is an international effort to build the
world's largest radio telescope, with a one-square-kilometre collecting area. In
addition to its ambitious scientific objectives, such as probing cosmic dawn and
the cradle of life, the SKA demands several revolutionary technological
breakthroughs, such as ultra-high precision synchronisation of the frequency
references for thousands of antennas. In this report, with the purpose of
application to the SKA, we demonstrate a frequency reference dissemination and
synchronisation scheme in which the phase-noise compensation function is applied
at the client site. Hence, one central hub can be linked to a large number of
client sites, thus forming a star-shaped topology. As a performance test, a
100-MHz reference frequency signal from a hydrogen maser (H-maser) clock is
disseminated and recovered at two remote sites. The phase-noise characteristics
of the recovered reference frequency signal coincide with those of the H-maser
source and satisfy the SKA requirements.
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