Abstract
An experiment to measure acoustic reflection loss at the ocean surface was conducted in the North Sargasso Sea in December. A sonobuoy hydrophone received direct path and surface‐reflected signals from a dipole element transmitter suspended from a research vessel. Both source and receiver had similar depths of approximately 80 m in the surface layer and separation ranges from 0.5–3 km. Pulsed linear frequency modulated transmissions from 0.95–1.35 kHz of 15‐ms duration were used to perform matched filter correlations between the direct and surface reflected paths. Multipath separation was observed and surface reflection loss computations performed at specular grazing angles greater than 5 deg. Surface reflection loss versus grazing angle results under different sea‐state conditions are used for comparison with those of the Bechman‐Spezzichino scattering theory.
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