The non-coplanar baselines effect in interferometry

Details The non-coplanar baselines effect in interferometry The non-coplanar baselines effect in interferometry

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1351..706c&link_type=abstract

IN: Digital image synthesis and inverse optics; Proceedings of the Meeting, San Diego, CA, July 9-13, 1990 (A92-18776 05-74). Be

Astronomy and Astrophysics

Astronomy

4

Fourier Transformation, Image Reconstruction, Radio Interferometers, Sky Brightness, Synthetic Apertures, Angular Resolution, Field Of View, Maximum Entropy Method, Radio Sources (Astronomy)

Scientific paper

Noncoplanar sampling of the visibility function measured by interferometric arrays leads to difficulties in imaging wide fields. Unlike the case of coplanar sampling or small fields of view, the relationship between sky brightness and the visibility is not a simple two-dimensional Fourier transform, and the usual methods of image reconstruction cannot be applied. Some of the many schemes which have been advocated to overcome this problem are described and analyzed. The most promising is based upon an observation by Clark (1979) that if the sky brightness is thought of as lying on a surface embedded in a three-dimensional space, a Fourier relationship does hold.

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