Sediment Penetration of Underwater Mammalian Sonar Signals.
1997
Chotiros, Nicholas P.
The objective is characterization of buried target detection by underwater mammalian sonars. To this end, a collaboration has been formed between Applied Research Laboratories, The University of Texas at Austin (AflL:UT) and Naval Command, Control and Ocean Surveillance Center (NRaD), San Diego. ARL:UT brings expertise in the modeling of sediment acoustics, and signal processing. NRaD possesses extensive experience in the training of mammals to locate buried objects, as well as the facilities for experimental investigation. Mammalian sonar pulses will be recorded in the course of a buried object search exercise, to observe their evolution from the initial search phase, through detection, location and classification phases. A preliminary set of recordings was made in March 1996 to measure certain characteristics of the mammalian sonar signals. Progress has been made in the construction of the recording apparatus, which must not distract the mammals. The first set of measurements with the full system is planned for August 1996. In parallel, a theoretical model is being developed to simulate the penetration of sound pulses into the sediment. Initial results indicate the possibility of one incident pulse producing two pressure pulses in the sediment.
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