Abstract
During the daytime, upward refraction dominates atmospheric sound propagation. An elevated sensor can potentially give much higher sound-pressure levels and higher signal coherence. To understand daytime upward atmospheric sound propagation at higher altitudes, a comprehensive sound propagation experiment for receivers at various heights (up to 220 m) was performed in November 1998. In the experiment, both meteorological data and acoustic data were taken. Three single tone sources were used in the experiment (210, 380, and 600 Hz). The horizontal propagation distances were 300, 600, and 900 m. In this presentation, we will present the experimental results and calculations of sound-pressure level and coherence using the measured meteorological data as input. Numerical calculations are compared with the experimental data. Both experimental data and theoretical predictions show much higher sound-pressure levels and higher coherence at higher attitudes.
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