XTRAN: An Atmospheric Transmittance Code Based on XSCALE
ARMY LAB COMMAND WHITE SANDS MISSILE RANGE NM ATMOSPHERIC SCIENCES LAB
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Several Electro-Optical Systems Atmospheric Effects Library modules require the use of XSCALE for calculation of the natural atmospheric transmittance value. XSCALE is a large over 1600 lines of code algorithm, which, in some cases, requires other external modules or data files for execution. XTRAN, a comparatively smaller less than 240 lines computer code, was developed for use with the KWIK crosswind integrated concentration munition expenditure stand-alone versions SKWIK and IKWIK. XTRAN computes horizontal extinction and transmittance values based on the XSCALE module for visible, near-, mid-, and far-infrared wavelengths by using estimated values of visibility and polynomial regression equations for aerosol extinction as a function of relative humidity. This report shows the usefulness and practicality of the XTRAN code as a horizontal transmittance model.
- Atmospheric Physics