Radio-interferometric imaging of very large fields - The problem of non-coplanar arrays

Details Radio-interferometric imaging of very large fields - The problem of non-coplanar arrays Radio-interferometric imaging of very large fields - The problem of non-coplanar arrays

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...261..353c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 261, no. 1, p. 353-364.

Astronomy and Astrophysics

Astronomy

97

Image Analysis, Interferometry, Radio Sources (Astronomy), Very Large Array (Vla), Apertures, Fourier Transformation, Image Processing, Image Reconstruction, Sky Brightness

Scientific paper

Non-coplanar sampling of the coherence function of distant radio sources measured by interferometric arrays leads to errors in the imaging of wide fields when standard two-dimensional techniques are employed. Unlike co-planar sampling, the relationship between sky brightness and the coherence is not a simple two-dimensional Fourier transform, so the standard methods of image reconstruction cannot be utilized. We have developed and tested two methods of correctly imaging data taken from non-coplanar arrays: (1) A method based on Clark's observation that there exists a three-dimensional Fourier transform relationship between the sampled data and a three-dimensional image 'volume' within which the two-dimensional sky brightness is located; and (2) A multiple-field imaging technique which approximates the full three-dimensional relation as a patchwork of subfields. This method has been extended to allow each patch to be three dimensional. We demonstrate these two methods using 327 MHz data from the l-km maximum baseline and 10-km maximum baseline configurations of the VLA.

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