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Proceedings Paper

Iterative recursive image reconstruction from the bispectrum
Author(s): H. Weghorn
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Paper Abstract

The atmosphere degrades the angular resolution of astronomical observations with large telescopes dramatically. Instead of the theoretical resolution of, e.g., 0.04 arcseconds for a 3.6-m telescope at Ha only a value of about 1 arcsecond can be achieved in long exposure images. Short-time exposures (--, 20ms) consist of interference patterns. They are called speckle interferograms and contain the full resolution image information in convolved form. This full resolution information can be extracted from a set of speckle interferograms by bispectral analysis. One important step of this algorithm is the extraction of the object Fourier spectrum from the bispectrum, which is normally done by a recursive technique. This step can be improved using the iterative recursive reconstruction method, which is reported here. The degree of improvement has been investigated in a laboratory simulation.

Paper Details

Date Published: 26 July 1993
PDF: 2 pages
Proc. SPIE 1983, 16th Congress of the International Commission for Optics: Optics as a Key to High Technology, 198354 (26 July 1993); doi: 10.1117/12.2308603
Show Author Affiliations
H. Weghorn, Max-Planck-Institut fur Radioastronomie (Germany)

Published in SPIE Proceedings Vol. 1983:
16th Congress of the International Commission for Optics: Optics as a Key to High Technology
Gyorgy Akos; Tivadar Lippenyi; Gabor Lupkovics; Andras Podmaniczky, Editor(s)

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