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LFFM: The Low-frequency Facility Modeler
Atmospheric Infrasound Modeling
Atmospheric Infrasound Modeling

For outdoor acoustic sources or those emanating from an enclosed structure, it is of interest to model the propagation to a standoff sensor.  For a given source, predicting features of the propagation drive the ability to pursue source localization, classification, and yield estimation.

In this study, we leveraged daily weather charts from National Weather Service to characterize the atmospheric state for temperature and wind.  These atmospheric specifications were then combined with a Parabolic Equation (PE) propagation model to generate continuous wave (CW) transmission loss predictions.  The PE predictions at ground were then compiled over a complete circle of azimuths to generate Nx2D horizontal transmission loss mapping (acoustic footprint). 

The figure illustrates one atmospheric state of the atmosphere and the resulting acoustic footprint.  The anisotropic nature of the propagation is clearly visible, highlighting the need for such calculations.

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