Toward increasing the accuracy and realism of future optical turbulence calculations |
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Authors: | A Tunick |
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Institution: | (1) U.S. Army Research Laboratory, Computational and Information Sciences Directorate, Adelphi, MD, USA |
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Abstract: | Summary Due to the increased use of laser and ground-to-satellite communications the need for reliable optical turbulence information
is growing. Optical turbulence information is important because it describes an atmospheric effect that can degrade the performance
of electromagnetic systems and sensors, e.g., free-space optical communications and infrared imaging. However, analysis of
selected past research indicates that there are some areas (i.e., data and models) in which optical turbulence information
is lacking. For example, line-of-sight optical turbulence data coupled with atmospheric models in hilly terrain, coastal areas,
and within cities are few in number or non-existent. In addition, the bulk of existing atmospheric computer models being used
to provide estimates of optical turbulence are basically one-dimensional in nature and assume uniform turbulence conditions
over large areas. As a result, current optical turbulence theory and models may be deficient and in error for inhomogeneous
(nonuniform) turbulence conditions, such as those that occur in urban environments or environments with changing topography
and energy budgets. While it is anticipated that theoretical advances in environmental physics (and like disciplines) will
be a catalyst for much new work this area, in the interim, we suggest that some very practical computational research can
be performed to extend existing low-atmospheric turbulence and micrometeorological calculations beyond current limitations. |
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