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Proceedings Paper

Validation of a worldwide physics-based, high spectral resolution atmospheric characterization and propagation package for UV to RF wavelengths
Author(s): Steven T. Fiorino; Richard J. Bartell; Matthew J. Krizo; Kenneth P. Moore; Salvatore J. Cusumano
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Paper Abstract

AFIT/CDE developed the High Energy Laser End-to-End Operational Simulation (HELEEOS) model in part to quantify the performance variance created by the natural environment in possible HEL engagements. As such HELEEOS includes a fast-calculating, first principles, worldwide surface to 100 km, atmospheric propagation and characterization package. This package is also available as a stand-alone module called the Laser Environmental Effects Definition and Reference or LEEDR. LEEDR enables the creation of profiles of temperature, pressure, water vapor content, optical turbulence, atmospheric particulates and hydrometeors as they relate to line-by-line layer transmission, path and background radiance at wavelengths from the ultraviolet to radio frequencies. Physics-based cloud and precipitation characterizations are coupled with a probability of cloud free line of sight (CFLOS) algorithm for air-to-air, air-tosurface, and surface-to-air (or space) look angles. This paper compares HELEEOS/LEEDR propagation assessments to measurements documented in published literature. Primary comparisons are to atmospheric boundary layer extinction measurements made using lidar systems at ultraviolet to near-infrared wavelengths and Doppler weather radars at RF wavelengths. The specific environments as recorded for the field experiments or radar observations in the literature are recreated using the probabilistic climatological database within HELEEOS/LEEDR. Comparisons of modeled climatological optical turbulence (C2n) values to recent near surface measurements of C2n are included. Preliminary results indicate the HELEEOS and LEEDR characterizations are able to accurately produce the major features and magnitudes in vertical profiles of extinction and backscatter in the atmospheric boundary layer at the UV, visible, near- IR, and centimeter wavelengths studied. The comparisons additionally show the models capture important geographic, seasonal, and time-of-day variations that appear in the measurements.

Paper Details

Date Published: 20 August 2008
PDF: 12 pages
Proc. SPIE 7090, Atmospheric Optics: Models, Measurements, and Target-in-the-Loop Propagation II, 70900I (20 August 2008); doi: 10.1117/12.795435
Show Author Affiliations
Steven T. Fiorino, Air Force Institute of Technology (United States)
Richard J. Bartell, Air Force Institute of Technology (United States)
Matthew J. Krizo, Air Force Institute of Technology (United States)
Kenneth P. Moore, Air Force Institute of Technology (United States)
Salvatore J. Cusumano, Air Force Institute of Technology (United States)

Published in SPIE Proceedings Vol. 7090:
Atmospheric Optics: Models, Measurements, and Target-in-the-Loop Propagation II
Stephen M. Hammel; Alexander M. J. van Eijk; Mikhail A. Vorontsov, Editor(s)

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