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Adaptive ADMM in Distributed Radio Interferometric Calibration [article]

Sarod Yatawatta, Faruk Diblen, Hanno Spreeuw
<span title="2017-10-16">2017</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
Distributed radio interferometric calibration based on consensus optimization has been shown to improve the estimation of systematic errors in radio astronomical observations.  ...  In this paper, we extend the existing distributed calibration algorithms to use ADMM with an adaptive penalty parameter update.  ...  CONCLUSIONS We have compared the performance of adaptive penalty update in ADMM applied to distributed radio interferometric calibration.  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1710.05656v1">arXiv:1710.05656v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/hguxdq3bljg4vkrqyhpqoabdna">fatcat:hguxdq3bljg4vkrqyhpqoabdna</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20191025185937/https://arxiv.org/pdf/1710.05656v1.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/ff/24/ff244d0fba1e761f3310c8c6ff9690ed55d6e6d3.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1710.05656v1" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>

Data multiplexing in radio interferometric calibration

Sarod Yatawatta, Faruk Diblen, Hanno Spreeuw, L V E Koopmans
<span title="2017-12-05">2017</span> <i title="Oxford University Press (OUP)"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/qjdxzupqgjennounydm4zfdlem" style="color: black;">Monthly notices of the Royal Astronomical Society</a> </i> &nbsp;
Such limitations restrict several key data processing steps in radio interferometry. One such step is calibration where systematic errors in the data are determined and corrected.  ...  Accurate calibration is an essential component in reaching many scientific goals in radio astronomy and the use of consensus optimization that exploits the continuity of systematic errors across frequency  ...  I N T RO D U C T I O N In order to reach many scientific goals of modern radio astronomy, large amounts of interferometric data need to be collected to enable the detection of weak signals buried in the  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1093/mnras/stx3130">doi:10.1093/mnras/stx3130</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/vcvofjzje5gzrptptdn3q2tp6q">fatcat:vcvofjzje5gzrptptdn3q2tp6q</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20190427160621/https://www.rug.nl/research/portal/files/67686609/stx3130.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/9a/a1/9aa15f8519f14c694d18070340d781501bc53d80.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1093/mnras/stx3130"> <button class="ui left aligned compact blue labeled icon button serp-button"> <i class="external alternate icon"></i> oup.com </button> </a>

Robust sparse image reconstruction of radio interferometric observations with purify

Luke Pratley, Jason D. McEwen, Mayeul d'Avezac, Rafael E. Carrillo, Alexandru Onose, Yves Wiaux
<span title="2017-09-09">2017</span> <i title="Oxford University Press (OUP)"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/qjdxzupqgjennounydm4zfdlem" style="color: black;">Monthly notices of the Royal Astronomical Society</a> </i> &nbsp;
In particular, we implement and apply the proximal alternating direction method of multipliers (P-ADMM) algorithm presented in a recent article.  ...  The standard methods in radio interferometry for reconstructing images, such as CLEAN, have served the community well over the last few decades and have survived largely because they are pragmatic.  ...  ACKNOWLEDGMENTS LP thanks Melanie Johnston-Hollitt for discussions on the practical constraints of current interferometric imaging and useful comments on the manuscript, Xiaohao Cai for discussions on  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1093/mnras/stx2237">doi:10.1093/mnras/stx2237</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/wsqaf5gqvnfgpfutxcf5wlrv5q">fatcat:wsqaf5gqvnfgpfutxcf5wlrv5q</a> </span>
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w-stacking w-projection hybrid algorithm for wide-field interferometric imaging: implementation details and improvements [article]

L. Pratley and M. Johnston-Hollitt and J. D. McEwen
<span title="2019-03-13">2019</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
In particular, we discuss the methodology used to deploy the algorithm efficiently on a supercomputer via use of a Message Passing Interface (MPI) k-means clustering technique to achieve efficient construction  ...  We present a detailed discussion of the implementation strategies for a recently developed w-stacking w-projection hybrid algorithm used to reconstruct wide-field interferometric images.  ...  ACKNOWLEDGEMENTS We thank Dr Benjamin McKinley for providing the calibrated MWA data of Fornax A.  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1903.06555v1">arXiv:1903.06555v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/vexecpxzwzfnzlyytzgzsvbmnm">fatcat:vexecpxzwzfnzlyytzgzsvbmnm</a> </span>
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Multi-frequency calibration for DOA estimation with distributed sensors [article]

Martin Brossard, Virginie Ollier, Mohammed Nabil El Korso, Rémy Boyer, Pascal Larzabal
<span title="2020-02-24">2020</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
Specifically, we adopt a distributed optimization scheme in which coherence models are incorporated and local agents exchange information only between connected nodes in the network, i.e., without a fusion  ...  In this work, we investigate direction finding in the presence of sensor gain uncertainties and directional perturbations for sensor array processing in a multi-frequency scenario.  ...  The latter has been studied in several applications, e.g., radar, sonar, satellite, wireless communication and radio interferometric systems [4, 5] , where we commonly use largely distributed sensors  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/2002.11498v1">arXiv:2002.11498v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/yhr6bokvvrez3eda5zm6u456ha">fatcat:yhr6bokvvrez3eda5zm6u456ha</a> </span>
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Scalable splitting algorithms for big-data interferometric imaging in the SKA era

Alexandru Onose, Rafael E. Carrillo, Audrey Repetti, Jason D. McEwen, Jean-Philippe Thiran, Jean-Christophe Pesquet, Yves Wiaux
<span title="2016-08-01">2016</span> <i title="Oxford University Press (OUP)"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/qjdxzupqgjennounydm4zfdlem" style="color: black;">Monthly notices of the Royal Astronomical Society</a> </i> &nbsp;
We focus herein mainly on scalability and propose two new convex optimisation algorithmic structures able to solve the convex optimisation tasks arising in radio-interferometric imaging.  ...  Tailored for big-data, they employ parallel and distributed computations to achieve scalability, in terms of memory and computational requirements.  ...  RADIO-INTERFEROMETRIC IMAGING Radio-interferometric data, the visibilities, are produced by an array of antenna pairs that measure radio emissions from a given area of the sky.  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1093/mnras/stw1859">doi:10.1093/mnras/stw1859</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/l5bcsuqzbraf3ivddkja3pitya">fatcat:l5bcsuqzbraf3ivddkja3pitya</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20170922031634/https://infoscience.epfl.ch/record/215069/files/scalable-splitting-algorithms-for-ska.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/ac/19/ac19eddf07f6ad85c55e0690b6414b43fe73a54b.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1093/mnras/stw1859"> <button class="ui left aligned compact blue labeled icon button serp-button"> <i class="external alternate icon"></i> oup.com </button> </a>

Bayesian Calibration using Different Prior Distributions: an Iterative Maximum A Posteriori Approach for Radio Interferometers [article]

Virginie Ollier, Mohammed Nabil El Korso, André Ferrari, Rémy Boyer, Pascal Larzabal
<span title="2018-07-30">2018</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
In this paper, we aim to design robust estimation techniques based on the compound-Gaussian (CG) process and adapted for calibration of radio interferometers.  ...  The proposed algorithm is applied in a multi-frequency scenario in order to enhance the estimation and correction of perturbation effects.  ...  Indeed, radio interferometric data are affected by the occurrence of outliers due, e.g., to man-made radio frequency interferences or unmodelled weak sources [1] [2] [3] .  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1807.11382v1">arXiv:1807.11382v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/plv6njunwrcyth5skt4zj4ct3a">fatcat:plv6njunwrcyth5skt4zj4ct3a</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20200829063135/https://arxiv.org/pdf/1807.11382v1.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/9b/42/9b42d1531370bbec8ca565e71ce3ccf3e15a0022.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1807.11382v1" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>

The w-effect in interferometric imaging: from a fast sparse measurement operator to superresolution

A. Dabbech, L. Wolz, L. Pratley, J. D. McEwen, Y. Wiaux
<span title="2017-07-14">2017</span> <i title="Oxford University Press (OUP)"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/qjdxzupqgjennounydm4zfdlem" style="color: black;">Monthly notices of the Royal Astronomical Society</a> </i> &nbsp;
Consequently, memory requirements and computational cost are significantly alleviated, at the expense of introducing errors on the radio-interferometric data model.  ...  Modern radio telescopes, such as the Square Kilometre Array (SKA), will probe the radio sky over large fields-of-view, which results in large w-modulations of the sky image.  ...  This results in model errors of the radio interferometric measurements.  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1093/mnras/stx1775">doi:10.1093/mnras/stx1775</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/w4mxjlsa6jdwvjtw7r33yc54ba">fatcat:w4mxjlsa6jdwvjtw7r33yc54ba</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20200309171946/https://discovery.ucl.ac.uk/id/eprint/1552557/1/McEwen_stx1775.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/04/5d/045d771edb46cd93574d0870c9fa6e5f7e048657.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1093/mnras/stx1775"> <button class="ui left aligned compact blue labeled icon button serp-button"> <i class="external alternate icon"></i> oup.com </button> </a>

An accelerated splitting algorithm for radio-interferometric imaging: when natural and uniform weighting meet

Alexandru Onose, Arwa Dabbech, Yves Wiaux
<span title="2017-03-29">2017</span> <i title="Oxford University Press (OUP)"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/qjdxzupqgjennounydm4zfdlem" style="color: black;">Monthly notices of the Royal Astronomical Society</a> </i> &nbsp;
We propose an acceleration strategy for a recently proposed primal-dual distributed algorithm.  ...  In connection to CLEAN, our approach can be seen as including in the same algorithmic structure both natural and uniform weighting, thereby simultaneously optimising both the resolution and the sensitivity  ...  RADIO-INTERFEROMETRIC IMAGING In RI, the measured data, the visibilities, are produced by an array of geographically separated antennas that are paired to measure radio emissions from a given area of the  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1093/mnras/stx755">doi:10.1093/mnras/stx755</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/lsjn5c2aibfszbfngqxlu5ivf4">fatcat:lsjn5c2aibfszbfngqxlu5ivf4</a> </span>
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Spatially constrained direction dependent calibration [article]

Sarod Yatawatta
<span title="2021-12-13">2021</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
Direction dependent calibration of widefield radio interferometers estimates the systematic errors along multiple directions in the sky.  ...  Fortunately, there is some deterministic behavior of these variations in most situations.  ...  In section 2, we define the radio interferometric data model and describe our spatially constrained distributed calibration algorithm.  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/2110.06780v2">arXiv:2110.06780v2</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/uvprxr4fovc4vfk35s4kko3y4e">fatcat:uvprxr4fovc4vfk35s4kko3y4e</a> </span>
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Principles of Image Reconstruction in Interferometry ebaut1 [chapter]

E. Thiébaut
<span title="2020-11-04">2020</span> <i title="EDP Sciences"> New Concepts in Imaging: Optical and Statistical Models </i> &nbsp;
Image reconstruction from interferometric data is an inverse problem.  ...  In optical interferometry, only the powerspectrum and the bispectrum can be measured and the joint criterion is highly multi-modal.  ...  Introducing variables splitting and ADMM strategy was also motivated by the effectiveness of a similar approach for multi-spectral interferometric data.  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1051/978-2-7598-2487-8.c011">doi:10.1051/978-2-7598-2487-8.c011</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/zmslfldq7ff5lnixycqzcxt73i">fatcat:zmslfldq7ff5lnixycqzcxt73i</a> </span>
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Cygnus A super-resolved via convex optimization from VLA data

A Dabbech, A Onose, A Abdulaziz, R A Perley, O M Smirnov, Y Wiaux
<span title="2018-02-13">2018</span> <i title="Oxford University Press (OUP)"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/qjdxzupqgjennounydm4zfdlem" style="color: black;">Monthly notices of the Royal Astronomical Society</a> </i> &nbsp;
An adaptive Preconditioned Primal-Dual algorithmic structure is developed for imaging in the presence of unknown noise levels and calibration errors.  ...  We also confirm the recent discovery of a radio transient in Cyg A, revealed in the recovered images of the investigated data sets. Our matlab code is available online on GitHub.  ...  ACKNOWLEDGEMENTS The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under coopera-tive agreement by Associated Universities, Inc.  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1093/mnras/sty372">doi:10.1093/mnras/sty372</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/y27iittazrgobmzmtsuixxkzpy">fatcat:y27iittazrgobmzmtsuixxkzpy</a> </span>
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Wide-band Rotation Measure Synthesis [article]

Luke Pratley, Melanie Johnston-Hollitt
<span title="2020-01-21">2020</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
We show this can be considered mathematically equivalent to the one dimensional interferometric intensity measurement equation, albeit in a different Fourier space.  ...  This is of particular importance for extreme environments which generate high magnetic fields such as those associated with pulsars and Fast Radio Bursts (FRBs), and will allow such sources to be accurately  ...  ACKNOWLEDGEMENTS LP and MJ-H thank the anonymous referee for their careful reading of the manuscript and comments which improved the clarity of Section 5, in particular.  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1906.00866v2">arXiv:1906.00866v2</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/r7vzhraqcrhmje5bc2kdryikpq">fatcat:r7vzhraqcrhmje5bc2kdryikpq</a> </span>
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Principles of image reconstruction in optical interferometry: tutorial

Éric Thiébaut, John Young
<span title="2017-05-15">2017</span> <i title="The Optical Society"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/x7beftam25dklnfekgui7ayivu" style="color: black;">Optical Society of America. Journal A: Optics, Image Science, and Vision</a> </i> &nbsp;
In the proposed general framework, most existing algorithms can be understood.  ...  This paper provides a general introduction to the problem of image reconstruction from interferometric data.  ...  For this reason, quadratic regularizations have long been considered as being badly adapted to interferometric image reconstruction [9] .  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1364/josaa.34.000904">doi:10.1364/josaa.34.000904</a> <a target="_blank" rel="external noopener" href="https://www.ncbi.nlm.nih.gov/pubmed/29036073">pmid:29036073</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/bl4rn7tlezbfphqrr3q5q3ntx4">fatcat:bl4rn7tlezbfphqrr3q5q3ntx4</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20190222101657/http://pdfs.semanticscholar.org/34f4/637ca4322ab7592a809c4fe5b1afc38fa9e9.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/34/f4/34f4637ca4322ab7592a809c4fe5b1afc38fa9e9.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1364/josaa.34.000904"> <button class="ui left aligned compact blue labeled icon button serp-button"> <i class="external alternate icon"></i> Publisher / doi.org </button> </a>

A Fast and Exact w-stacking and w-projection Hybrid Algorithm for Wide-field Interferometric Imaging

Luke Pratley, Melanie Johnston-Hollitt, Jason D. McEwen
<span title="2019-04-04">2019</span> <i title="American Astronomical Society"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/otgg2yqymve23nrsflax26msgm" style="color: black;">Astrophysical Journal</a> </i> &nbsp;
The standard wide-field imaging technique, the w-projection, allows correction for wide-fields of view for non-coplanar radio interferometric arrays.  ...  We develop a distributed w-stacking and w-projection hybrid algorithm.  ...  We thank the anonymous referee for their help in improving the focus of the manuscript. Facilities: MWA, Pawsey Supercomputing Centre  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.3847/1538-4357/ab0a05">doi:10.3847/1538-4357/ab0a05</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/ftfidhc7kzcnrp6g6xra2dmk3a">fatcat:ftfidhc7kzcnrp6g6xra2dmk3a</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20191013183241/https://arxiv.org/pdf/1807.09239v2.pdf" title="fulltext PDF download [not primary version]" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <span style="color: #f43e3e;">&#10033;</span> <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/ec/f3/ecf32f756de5cb4e44f310f132790f13ed73a234.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.3847/1538-4357/ab0a05"> <button class="ui left aligned compact blue labeled icon button serp-button"> <i class="external alternate icon"></i> Publisher / doi.org </button> </a>
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