Publication Detail

The Detection of Fishes and Cetaceans Using the Vector Sound-Intensity Probe

Kenneth D. Ekstrom, Clifford Goudey
28 pp.
MITSG 97-01
$5.50 (domestic), 7.50 (foreign). DOM

The authors surveyed typical sounds of fishes and cetaceans and specified their finbeats and ensonifications using the fast fourier transform to discern characteristic spectral patterns. Continuous swimming is shown by stationary signals while darting and veering cause narrowband transients in the extra low frequency band. Dolphin and whale finbeats, pulse bursts and calls are displayed on a spectral scale. The vector sound-intensity probe (VSIP) is analyzed for its viability as a broadband localization sensor of these signals. It suppresses isotropic ocean noise and can detect fading multipath signals unsensed by conventional arrays which rely on the sound pressure. The VSIP yields azimuth and pitch of individual spectral features and can function as a robust tracking receiver for autonomous underwater vehicles and autonomous surface craft.

type: Technical reports

Parent Project

Project No.: 1995-RC-45-PD
Title: Oxygen Utilization and Organic Matter Degradation Rates: In Massachusetts Bay and In Primary vs. Secondary Effluent