Acoustic characterization of a shallow water site
Results are presented from an exercise aimed at providing a low frequency active sonar environmental characterization of a specific shallow water site in the Gulf of Mexico. Downward refracting acoustic transmission and reverberation measurements were made in 100 fathom water from 25 Hz to 1 kHz using explosive sources detonated at mid-water depth. The receiving sensors were two 25 element, nested aperture hydrophone line arrays, one vertical near the bottom and the other horizontal on the bottom. Transmission data have been analyzed to yield transmission loss, multipath induced time spread and transverse spatial coherence. From the reverberation data bottom scattering strengths and horizontal reverberation directionality have been determined. The data presented will pennit direct estimates of reverberation limited active sonar perfonnance to be made for this environment.
SourceIn: Low frequency active sonar (SACLANTCEN Conference Proceedings CP-42), vol. 1, 1993, pp. A/2-1 - A/2-17.