Sound Propagation in the Atmosphere: Analysis of Signal Amplitude and Phase Temporal and Spatial Variations
PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB
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Temporal and spatial variations of the signal amplitude and phase were studied by use of a well developed atmospheric sound propagation prediction model. Modifications were made to this ray tracing model to incorporate the calculation of phase. Full documentation on the original and its modifications were provided. Two case studies were performed using actual meteorological data as input. The first study was representative of long distance 25 km sound propagation in a mountainous region. The second was representative of sound propagation over much shorter distances 600 m in a forest environment. The results of both signal amplitude and phase were displayed in a statistical format. This format was an aid to analyzing and explaining the temporal and spatial variabilities.