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Proceedings Paper

Point-spread-function calibration of dilute aperture imagery
Author(s): E. Keith Hege; Matthew Cheselka; Richard G. Dekany; D'nardo Colucci
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Paper Abstract

Astronomical speckle holographic methods are shown to calibrate the image blurring effects of the large fraction of the energy in the side-lobes of the point spread function of a dilute aperture imaging system. This self calibration method works for imagery which contains a local point-like reference within the partially isoplanatic field of view. The reference may be a physical object within the (partially isoplanatic) field of view or it may be reconstructed by iterative deconvolution. Data reductions with an iterative deconvolution algorithm show even more striking performance than speckle holography. Atmospheric modeling was used to simulate multiple observations of the same target object with a 5 m dilute aperture pupil with different point spread functions. The iterative deconvolution algorithm recovers Fourier interpolated results for the equivalent 25 m filled aperture without requiring independent observations of a point-like reference source.

Paper Details

Date Published: 9 November 1993
PDF: 10 pages
Proc. SPIE 2029, Digital Image Recovery and Synthesis II, (9 November 1993); doi: 10.1117/12.162010
Show Author Affiliations
E. Keith Hege, Steward Observatory/Univ. of Arizona (United States)
Matthew Cheselka, Steward Observatory/Univ. of Arizona (United States)
Richard G. Dekany, Univ. of Arizona (United States)
D'nardo Colucci, Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 2029:
Digital Image Recovery and Synthesis II
Paul S. Idell, Editor(s)

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