Reconstruction of computer simulated, atmospheric turbulence-degraded, astronomical objects by application of the Knox-Thompson and triple-correlation phase recovery techniques
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Authors
Lackemacher, James M.
Subjects
Image Reconstruction
Knox-Thompson
Triple-Correlation
Knox-Thompson
Triple-Correlation
Advisors
Walters, Donald L.
Matson, Charles L.
Roggeman, Michael C.
Date of Issue
1990-12
Date
December 1990
Publisher
Monterey, California: Naval Postgraduate School
Language
Abstract
Atmospheric turbulence severely degrades images of astronomical objects. Providing images that accurately reflect the true nature of these objects is essential to their understanding. Several object recovery techniques exist within the field of speckle imaging that produce accurate representations of astronomical objects. This thesis provides an in-depth comparison of two such techniques, Knox-Thompson and triple-correlation. Through computer simulation, this thesis accurately compares the abilities of both recovery techniques to enhance turbulence degraded objects by exploiting the diffraction-limited information contained in short exposure, or speckle, images. The simulation produced these images by creating an object and several phase screens which simulated the effects of turbulence. Together, the object and the appropriate quantity of phase screens yielded the required short exposure images. Application of the Knox-Thompson and triple-correlation techniques to identical sets of these degraded images produced the resulting reconstructed objects, their signal-to-noise ratios and their azimuthal RMS phase errors. Comparison of these three factors over several imaging criteria concluded that the superior phase recovery technique was triple-correlation.
Type
Thesis
Description
Series/Report No
Department
Department of Physics
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
viii, 180 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.