Accession Number : ADA265023


Title :   Definition of the Acoustical Structure of Echolocation Pulse Trains of an Atlantic Bottlenose Dolphin in Captivity


Corporate Author : NAVAL UNDERWATER SYSTEMS CENTER NEW LONDON CT


Personal Author(s) : Schiefele, Peter M ; Manstan, Roy


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a265023.pdf


Report Date : 28 Dec 1990


Pagination or Media Count : 15


Abstract : Echolocation capabilities of an Atlantic bottlenose dolphin, Tursiops truncatus, were observed in a target detection experiment. Pulse trains occurring during the echolocation sequence were then analyzed in an effort to determine the animal's average frequency range, choice of center frequency, bandwidth, pulse repetition rate, pulse duration, amplitude, and signal-to- noise-ratio (SNR). The animal was trained to detect a polypropylene ring measuring 14.34 centimeters in diameter. Target ranges of 11.582 meters and 15. 85 meters were used. Signal-to-noise-ratio (SNR) was determined as a function of pool ambient noise and reverberation characteristics at each target range. The animal was observed to be consistent in its performance at the correct response threshold of 75 percent.


Descriptors :   *SONAR , *ECHO RANGING , *DOLPHINS(MAMMALS) , *MARINE BIOLOGICAL NOISE , TARGET RECOGNITION , SOUND GENERATORS , UNDERWATER SOUND SIGNALS , NOISE , TARGET DETECTION


Subject Categories : Biological Oceanography
      Acoustic Detection and Detectors
      Acoustics


Distribution Statement : APPROVED FOR PUBLIC RELEASE