Validation of the MODTRAN 6 refracted geometry algorithms in the marine boundary layer and development of EOSPEC modules

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Authors
  1. Ross, V.
Corporate Authors
Defence Research and Development Canada, Valcartier Research Centre, Quebec QC (CAN);AEREX Avionics Inc, Breakeyville QUE (CAN)
Abstract
As MODTRAN evolves it is essential to maintain validation efforts, even in areas that have been previously studied in great detail. One such area of concern for the DRDC involves the behaviour of MODTRAN in the marine boundary layer. These environments are prone to large gradients of temperature and water vapor content, giving rise to large gradients in refraction index. In cases where viewing geometries are near horizontal, optical trajectories can undergo strong bending either upwards or downwards depending on the direction of the refractive gradients. In 2002, the DRDC conducted a series of tests of MODTRAN 4 in these conditions and put to light occasional shortcomings of MODTRAN’s refractive geometry algorithm[1]. In 2012, MODTRAN 5.3.1.1 Beta was submitted to the same series of test cases with similar results[2]. This is an effort to reproduce the same series of test cases with very similar parameters, and to compare MODTRAN version 6.0.0.0 Beta results with those obtained with MODTRAN 5.3.1.1.
Keywords
MODTRAN;radiative transfer;refractivity;EOSPEC
Report Number
DRDC-RDDC-2016-C141 — Contract Report
Date of publication
01 Mar 2015
Number of Pages
18
DSTKIM No
CA042524
CANDIS No
803769
Format(s):
Electronic Document(PDF)

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