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Optical Engineering

Production of statistically nonstationary stochastic structure realizations for infrared background scene simulations
Author(s): Lisa A. Strugala; Robert D. Sears; Jerry E. Newt; Bruce J. Herman
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Paper Abstract

We describe the development of a 3-D statistically nonstationary earthlimb stochastic structure representation and its application to earthlimb infrared (IR) background structure simulations. An earthlimb viewing geometry is defined by the location of both observer and source in space. The line-of-sight tangent altitude is the minimum altitude of the trajectory, defined at the earth-centered perpendicular to the line of sight. The stochastic structure overlay is constructed from a 2-D diagonal cut through a 3-D matrix of correlated Gaussian deviates; each plane of the matrix represents a statistically constant representation of the 2-D correlation lengths at a given altitude above the earth. Each matrix plane is generated using successive 2-D fast Fourier transform routines that have empirical values of vertical and horizontal correlation lengths as input. The total deviate variance versus altitude is then scaled from empirical measurements of fluctuations in atmospheric density, temperature, and/or emissivity. These structure generators are used both as perturbations on input atmospheric data to IR radiance codes and as high-resolution overlays to earthlimb lR mean-radiance 2-D scenes. An IR structured scene realization and scene validation analysis is presented.

Paper Details

Date Published: 1 May 1993
PDF: 9 pages
Opt. Eng. 32(5) doi: 10.1117/12.133380
Published in: Optical Engineering Volume 32, Issue 5
Show Author Affiliations
Lisa A. Strugala, Lockheed Palo Alto Research Lab. (United States)
Robert D. Sears, Lockheed Palo Alto Research Lab. (United States)
Jerry E. Newt, Lockheed Palo Alto Research Lab. (United States)
Bruce J. Herman, Lockheed Palo Alto Research Lab. (United States)

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