Zobrazeno 1 - 10
of 12
pro vyhledávání: '"Charles Gravestock"'
Autor:
Benjamin P. Dix-Matthews, Sascha W. Schediwy, David R. Gozzard, Etienne Savalle, François-Xavier Esnault, Thomas Lévèque, Charles Gravestock, Darlene D’Mello, Skevos Karpathakis, Michael Tobar, Peter Wolf
Publikováno v:
Nature Communications, Vol 12, Iss 1, Pp 1-8 (2021)
Atomic clocks and their networks are useful tools for optical communications and frequency metrology. Here the authors use phase stabilization and active tip-tilt to suppress atmospheric effects and enable optical frequency transfer through free-spac
Externí odkaz:
https://doaj.org/article/05fc4052970040a68e0158266aff628f
Autor:
Sascha Schediwy, Charles Gravestock, Alex Frost, Skevos Karpathakis, Ayden McCann, Shane Walsh, David Gozzard, Benjamin Dix-Matthews
Geopotential and orthometric height differences between distant points can be measured via timescale comparisons between atomic clocks. Modern optical atomic clocks have residual instabilities on the order of 10^-18}, allowing height differences of a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2106d0b6a32198cb3590d74c8b41b477
https://doi.org/10.36227/techrxiv.21637715
https://doi.org/10.36227/techrxiv.21637715
Autor:
Shane Walsh, Skevos Karpathakis, Ayden McCann, Benjamin Dix-Matthews, Alex Frost, David Gozzard, Charles Gravestock, Sascha Schediwy
Free-space optical communications are poised to alleviate the data-flow bottleneck experienced by spacecraft as traditional radio frequencies reach their practical limit. While enabling orders-of-magnitude gains in data rates, optical signals impose
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::713c12dc1df40b205c6b4bd6661c7c06
https://doi.org/10.21203/rs.3.rs-1951625/v1
https://doi.org/10.21203/rs.3.rs-1951625/v1
Autor:
Skevos F. E. Karpathakis, Benjamin P. Dix-Matthews, Sascha W. Schediwy, David R. Gozzard, Charles Gravestock
Publikováno v:
IEEE Communications Letters. 25:1610-1614
Free-space optical (FSO) communications have the potential to revolutionize wireless communications due to the advantages of greater inherent security, high-directionality, high available bandwidth and small physical footprint. The effects of atmosph
Autor:
Shane Walsh, Alex Frost, Lewis Howard, David Gozzard, Skevos Karpathakis, Benjamin Dix-Matthews, Charles Gravestock, Ayden McCann, Sascha Schediwy
Publikováno v:
Optics letters. 47(8)
Corner cube retroreflectors are commonly used as cooperative targets in free-space laser applications. The previous literature suggests that due to path reciprocity, a retroreflected beam is self-corrected across a turbulent atmosphere and should sho
Autor:
Aniket Hendre, Bassem Alachkar, Paul Boven, Songlin Chen, Hannah Collingwood, John Davis, Peter Dewdney, David Gozzard, Keith Grainge, Charles Gravestock, Yichen Guo, David Hindley, Maria Grazia Labate, Sascha Schediwy, Simon Stobie, Luca Stringhetti, Gerhard Swart, Bo Wang, Lijun Wang, Mark Waterson, Richard Whitaker, Althea Wilkinson
Publikováno v:
Journal of Astronomical Telescopes, Instruments, and Systems. 8
Autor:
Sascha W. Schediwy, Darlene D’Mello, David R. Gozzard, Charles Gravestock, Francois-Xavier Esnault, Benjamin P. Dix-Matthews, Skevos F. E. Karpathakis, Etienne Savalle, Peter Wolf, Thomas Leveque, Michael E. Tobar
Publikováno v:
Nature Communications
Nature Communications, Nature Publishing Group, 2021, 12 (1), pp.515. ⟨10.1038/s41467-020-20591-5⟩
Nature Communications, Vol 12, Iss 1, Pp 1-8 (2021)
Nature Communications, Nature Publishing Group, 2021, 12 (1), pp.515. ⟨10.1038/s41467-020-20591-5⟩
Nature Communications, Vol 12, Iss 1, Pp 1-8 (2021)
Timescale comparison between optical atomic clocks over ground-to-space and terrestrial free-space laser links will have enormous benefits for fundamental and applied science, from measurements of fundamental constants and searches for dark matter, t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1f58c51be974f1a315b0f74e96bfa84f
https://hal.archives-ouvertes.fr/hal-02922208/file/s41467-020-20591-5.pdf
https://hal.archives-ouvertes.fr/hal-02922208/file/s41467-020-20591-5.pdf
Autor:
Charles Gravestock, Skevos F. E. Karpathakis, Sascha Schediwy, David R. Gozzard, Thea R. Pulbrook
Publikováno v:
Journal of Astronomical Telescopes, Instruments, and Systems. 6
Next-generation radio telescopes, such as the Square Kilometre Array (SKA) and Next Generation Very Large Array (ngVLA), require precise microwave frequency reference signals to be transmitted over fiber links to each dish to coherently sample astron
Autor:
David R. Gozzard, Jocias Malan, Charles Gravestock, Sascha Schediwy, Keith Grainge, Simon Stobie, Richard Whitaker, Paul Boven, Bassem Alachkar, Thea R. Pulbrook
Publikováno v:
2018 2nd URSI Atlantic Radio Science Meeting (AT-RASC).
The Square Kilometre Array (SKA) project [1] is an international effort to build the world's most sensitive radio telescope operating in the 50 MHz to 14 GHz frequency range. Construction of the SKA has been divided into phases, with the first phase
Autor:
David R. Gozzard, Paul Boven, Richard Whitaker, Keith Grainge, Charles Gravestock, Simon Stobie, Jocias Malan, Sascha Schediwy
Publikováno v:
Schediwy, S W, Gozzard, D R, Gravestock, C, Stobie, S, Whitaker, R, Malan, J A, Boven, P & Grainge, K 2019, ' The mid-frequency Square Kilometre Array phase synchronisation system ', Publications of the Astronomical Society of Australia, vol. 36 . https://doi.org/10.1017/pasa.2018.48
This paper describes the technical details and practical implementation of the Mid-Frequency Square Kilometre Array (SKA) phase synchronisation system. Over a four-year period, the system has been tested on metropolitan fibre-optic networks, on long-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d023f5f8a2f00aa3beca6f3bff542911