Zobrazeno 1 - 10
of 66
pro vyhledávání: '"Sascha Schediwy"'
Autor:
Ayden McCann, Alex Frost, Skevos Karpathakis, Benjamin Dix-Matthews, David Gozzard, Shane Walsh, Sascha Schediwy
Publikováno v:
Photonics, Vol 11, Iss 7, p 633 (2024)
Free space optical technology promises to revolutionize point-to-point communications systems. By taking advantage of their vastly higher frequencies, coherent optical systems outperform their radio counterparts by orders of magnitude in achievable d
Externí odkaz:
https://doaj.org/article/9f01950610ec44bb9e8c9914e1506755
Free-space continuous-wave laser interferometry using folded links has applications in precision measurement for velocimetry, vibrometry, optical communications, and verification of frequency transfer for metrology. However, prompt reflections from t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::807d62cf6537afa86e4a0740a116c9e2
https://doi.org/10.1364/opticaopen.22672420.v1
https://doi.org/10.1364/opticaopen.22672420.v1
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:
Sascha Schediwy, Emmaline Yearsley, Mia Walker, Luke Verduyn, Aoife Stapleton, Raunaq Bushan, Andrew Burton, Jake Jones, Randall Wayth
We describe a portable 32-antenna coherent passive radar system. The system was developed with space domain awareness in mind, but can be used for aircraft and nearer objects. We describe the physical and signal processing architecture and the result
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b0de99e1f03358531c99d4d14d1606a9
https://doi.org/10.36227/techrxiv.21600750.v1
https://doi.org/10.36227/techrxiv.21600750.v1
Autor:
Sascha Schediwy, Alex Frost, Ayden McCann, Shane Walsh, Skevos Karpathakis, David Gozzard, Benjamin Dix-Matthews
We report on the development of a system called velocimetry by actively stabilised coherent optical transfer (VASCOT) that is capable of overcoming these challenges. VASCOT optically tracks the phase of the returned signal to allow for narrow-band ph
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::41b6ad6d17103fc945fc75f63cbf0a34
https://doi.org/10.36227/techrxiv.21637727
https://doi.org/10.36227/techrxiv.21637727
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:
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
Publikováno v:
Geophysical Journal International. 226:564-581
SUMMARYAmbient wavefield data acquired on existing (so-called ‘dark fibre’) optical fibre networks using distributed acoustic sensing (DAS) interrogators allow users to conduct a wide range of subsurface imaging and inversion experiments. In part
Autor:
Shane Walsh, Sascha Schediwy
Publikováno v:
Optics Letters. 48:880
Adaptive optics pre-compensation of free-space optical communications uplink from ground to space is complicated by the “point ahead angle” due to spacecraft velocity and the finite speed of light, as well as anisoplanatism of the uplink beam and
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