Abstract
This paper describes an optical model of the atmosphere that fundamentally
differs from the working models used to estimate how the atmosphere affects the
operation of optoelectronic devices. The model includes concepts of typical
aerosol situations (tropics, mid-latitude summer, etc.) and obtains its input
parameters from standard weather reports. Molecular absorption is determined on
the basis of the HITRAN spectral-line database; the concept of the transmission
function is not used in this case, and accordingly the problem of an unresolved
spectrum does not arise in problems of radiation transport in a medium with a
complex structure of the absorption spectrum in the IR region. The latter
problem is especially acute in determining the contrast of observed objects when
the viewing paths have complex geometry. The approach used here is equivalent to
line integration with an insignificant loss of accuracy and significant speed-up
of the calculation. The model makes it possible to take into account diurnal and
seasonal changes of the viewing conditions in the troposphere and especially in
its lower layers with the maximum adequacy, both in clear weather and under low
unbroken clouds, with and without precipitation.
© 2014 Optical Society of America
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