Sediment Penetration of Underwater Mammalian Sonar Signals.
Annual rept. 15 Sep 96-14 Sep 97,
TEXAS UNIV AT AUSTIN APPLIED RESEARCH LABS
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The adopted approach for characterization of buried target detection by underwater mammalian sonars, as represented by the sonar of tursiops truncatus has three components 1 direct measurement and analysis of acoustic signals incident on buried targets 2 construction of acoustic penetration and target scattering model and 3 deduction of detection and classification methods through reproduction of target insonification processes. It has been two years since the start of the project, but progress has not kept up with the original milestone chart due to a drastic rearrangement of the funding profile. At present, tasks 1 and 2 are in progress. Under task 1, although the completion of the full measurement system has been delayed by funding problems, signals have been recorded with a reduced system in collaboration with Naval Control, Command Ocean Surveillance Center NCCOSC, San Diego. Under task 2, a model for wide band acoustic penetration of ocean sediments has been developed to compute the penetration of dolphin sonar pulses, based on Biots theory1 ,2 of acoustic propagation in water-saturated porous media. This approach is general enough to model a wide variety of sediments, and has been found particularly suitable for sandy sediments.
- Acoustic Detection and Detectors