Optimum weighting function in bispectral analysis in speckle interferometry - Binary star parity detection

Karbelkar, SN (1990) Optimum weighting function in bispectral analysis in speckle interferometry - Binary star parity detection. In: Astronomy & Astrophysics, 238 (1-2). pp. 485-493.

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Abstract

In order to describe the atmospheric turbulence which limits the resolution of long-exposure images obtained using ground-based large telescopes, a simplified model of a speckle pattern, reducing the complexity of calculating field-correlations of very high order, is presented. Focal plane correlations are used instead of correlations in the spatial frequency domain. General tripple correlations for a point source and for a binary are calculated and it is shown that they are not a strong function of the binary separation. For binary separations close to the diffraction limit of the telescope, the genuine triple correlation technique ensures a better SNR than the near-axis Knox-Thompson technique. The simplifications allow a complete analysis of the noise properties at all levels of light.

Item Type:	Journal Article
Publication:	Astronomy & Astrophysics
Publisher:	EDP Sciences
Additional Information:	Copyright of this article belongs to EDP Sciences.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	25 Feb 2011 09:08
Last Modified:	25 Feb 2011 09:08
URI:	http://eprints.iisc.ac.in/id/eprint/34993

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