Abstract
The results of an eighteen month ambient noise measurement program at the Azores Fixed Acoustic Range are discussed. Measurements were made over the decade of acoustic frequencies from 500 to 5000 Hz using mechanically steered, directive receiving antennas. Received levels have been correlated with wind speed and wave height at each center frequency. The angular dependence of noise level has been compared to the model of Liggett and Jacobson. The comparison is good at lower acoustic frequency but degrades as center frequency increases. The large quantity of available data, simultaneous measurements on two independent receiving systems, and the mechanical steering capability have provided a reliable set of ambient noise data. [Work supported by NAVSEA.]
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