Abstract
Ambient noise measurements have been made at high frequencies (7–40 kHz) to determine the vertical surface radiation pattern and spectral level as a function of environmental conditions. A multibeam acoustic lens mounted on a stable platform was used to perform the measurements. The data exhibited significant differences between the open ocean and Dabob Bay. The surface radiation pattern could be described by sin2θ (θ = grazing angle) dependence in Dabob Bay as compared to a sinθ behavior in the open ocean. The spectral slopes were found to be significantly larger in Dabob Bay as compared to the open ocean results and the Knudsen curves. The spectral level, however, was in general agreement between the two locations. The spectral level was also in agreement with the results of other investigators, particularly the dependence on wind speed and rain rate. [Work supported by the Naval Sea Systems Command under contract N00024‐78‐C‐6018.]
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