Spectral Sciences, Inc.

United States of America As Represented by the Secretary of the Air Force

Prabhat K Acharya

Gail P Anderson

Alexander Berk

Lawrence S Bernstein

James H Chetwynd

Steven M Adler-Golden

Jamine Lee

Eric P Shettle

David C Robertson

Larry S Bernstein

Michael L Hoke

Leonid Muratov

Paul Lewis

A radiative transport band model method for prediction and analysis of high spectral resolution radiometric measurements. Atomic and molecular line center absorption is determined from finite spectral bin equivalent widths. A mathematically exact expansion for finite bin equivalent widths provides high accuracy at any desired spectral resolution. The temperature and pressure dependent Voigt line tail spectral absorption contributing to each spectral bin is pre-computed and fit to Pad&#xe9; approximants for rapid and accurate accounting of neighboring-to-distant lines. A specific embodiment has been incorporated into the MODTRAN&#x2122; radiation transport model.

Reformulated atmospheric band model method for modeling atmospheric propagation at arbitrarily fine spectral resolution and expanded capabilities.

A radiative transport band model algorithm has been developed for prediction and analysis of high spectral resolution radiometric measurements. Atomic and molecular line center absorption is determined from finite spectral bin equivalent widths. A new mathematically exact expansion for finite bin equivalent widths provides high accuracy at any desired spectral resolution. The temperature and pressure dependent Voigt line tail spectral absorption contributing to each spectral bin is pre-computed and fit to Pad&#xe9; approximants for rapid and accurate accounting of neighboring-to-distant lines.

Band model method for modeling atmospheric propagation at arbitrarily fine spectral resolution

Recent upgrades to the MOTRAN atmospheric radiation code improve the accuracy of its radiance predictions, especially in the presence of clouds and thick aerosols, and for multiple scattering in regions of strong molecular line absorption. MODTRAN3.5 features a generalized specification of cloud properties, while research version MODTRAN4 implements a Correlated-k (CK) approach for more accurate calculation of multiply scattered radiance. Comparisons to cloud measurements demonstrate the viability of the CK approach. The impact of these upgrades on predictions for AVIRIS viewing scenarios is discussed for both clear and clouded skies; the CK approach provides refined predictions for AVIRIS nadir and near-nadir viewing.

System and method for modelling moderate resolution atmospheric

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Burlington, MA, United States of America

Prabhat K Acharya