Extended high-angular-frequency analysis of turbulence effects on short-exposure imaging

David H. Tofsted

doi:10.1117/1.OE.53.4.044112

25 April 2014 Extended high-angular-frequency analysis of turbulence effects on short-exposure imaging

David H. Tofsted

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Optical Engineering, Vol. 53, Issue 4, 044112 (April 2014). https://doi.org/10.1117/1.OE.53.4.044112

Abstract

An improved analysis of optical turbulence effects on short-exposure passive (SE) imaging is described, resulting in a new analytic expression for the SE modulation transfer function (MTF). This analysis expands on a 2011 study that examined characteristics of a tilt-phase component discovered in the standard theory of SE turbulence effects characterization. The analysis introduces an improved integration technique and a reformulated phase structure function, facilitating computation of a 38,007 element database of MTF results at low- to high-angular frequencies covering a wide range of diffraction and turbulence conditions. Analysis of this database is described, yielding a new analytic SE MTF, accurate to a root-mean-square error of 0.000218 versus the database. Comparisons show that the new expression is well correlated to an alternative computationally intensive method, and it is a factor 29 to 64 improvement over prior analytic expressions. Limits of applicability of the approach for incoherent imaging are also discussed. The low-computational cost of the new method is suitable for systems performance modeling of turbulence impacts, including path-varying turbulence scenarios.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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David H. Tofsted "Extended high-angular-frequency analysis of turbulence effects on short-exposure imaging," Optical Engineering 53(4), 044112 (25 April 2014). https://doi.org/10.1117/1.OE.53.4.044112

Published: 25 April 2014

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