The Routledge Companion to Russian Literature

Cornwell, Neil

doi:10.4324/9780203193877

Cited by 31 publications

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“…In order to exploit the reduction in computational complexity offered by the 2D FFT, the visibility distribution can be converted into a set of approximately equivalent 2D forms (Cornwell et al 2008;Offringa et al 2014) and the celestial sky can be faceted into a set of 2D planes (Cornwell 1988). For very long baselines and for very wide FoVs, the computational and the storage costs for these methods can become high compared to the alternative, namely using the direct Fourier transform (FT) to compute the brightness map on the curved surface of the celestial sphere directly from the sampled visibility distribution.…”

Section: Introductionmentioning

confidence: 99%

“…Instead, this paper is dedicated to a series of case studies developed to highlight the advantages of making use of this approach for these types of cases, and this is the main contribution of this paper. The examples compare the computational and storage costs of this method with two methods based on the 2D representation of the interferometric transform: w-projection (Cornwell et al 2008) and wstacking (Offringa et al 2014), with both 2D approaches utilising faceting (Cornwell 1988), if necessary. It will be shown that A&A 603, A40 (2017) under certain conditions, the cost of the 3D approach is equivalent to, or in some cases better than that of these 2D approaches.…”

Section: Introductionmentioning

confidence: 99%

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Reconsidering the advantages of the three-dimensional representation of the interferometric transform for imaging with non-coplanar baselines and wide fields of view

Smith

Young

Davidson

2017

A&A

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Radio telescopes with baselines that span thousands of kilometres and with fields of view that span tens of degrees have been recently deployed, such as the Low Frequency Array, and are currently being developed, such as the Square Kilometre Array. Additionally, there are proposals for space-based instruments with all-sky imaging capabilities, such as the Orbiting Low Frequency Array. Such telescopes produce observations with three-dimensional visibility distributions and curved image domains. In most work to date, the visibility distribution has been converted to a planar form to compute the brightness map using a two-dimensional Fourier transform. The celestial sphere is faceted in order to counter pixel distortion at wide angles, with each such facet requiring a unique planar form of the visibility distribution. Under the above conditions, the computational and storage complexities of this approach can become excessive. On the other hand, when using the direct Fourier transform approach, which maintains the three-dimensional shapes of the visibility distribution and celestial sphere, the non-coplanar visibility component requires no special attention. Furthermore, as the celestial samples are placed directly on the curved surface of the celestial sphere, pixel distortion at wide angles is avoided. In this paper, a number of examples illustrate that under these conditions (very long baselines and very wide fields of view) the costs of the direct Fourier transform may be comparable to (or even lower than) methods that utilise the two-dimensional fast Fourier transform.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reconsidering the advantages of the three-dimensional representation of the interferometric transform for imaging with non-coplanar baselines and wide fields of view

Smith

Young

Davidson

2017

A&A

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National Identity in Russian Culture

Franklin¹,

Widdis²

2004

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When writing can change your life, when writing can enrich you by offering much money, why don't you try it? Are you still very confused of where getting the ideas? Do you still have no idea with what you are going to write? Now, you will need reading. A good writer is a good reader at once. You can define how you write depending on what books to read. This national identity in russian culture an introduction can help you to solve the problem. It can be one of the right sources to develop your writing skill.

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Franklin

Widdis

2004

National Identity in Russian Culture

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The Routledge Companion to Russian Literature

Cited by 31 publications

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Reconsidering the advantages of the three-dimensional representation of the interferometric transform for imaging with non-coplanar baselines and wide fields of view

Reconsidering the advantages of the three-dimensional representation of the interferometric transform for imaging with non-coplanar baselines and wide fields of view

National Identity in Russian Culture

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