Study of the Dolphin Acoustic Biosonar and Feasibility of ‎Constructing Its Technical Analogue ‎

Ivanov M.P., StepanovB.G.

Presented below are the results of experimental studies of the biosensor system of dolphins using acoustic ‎channel for search and identification of underwater objects as well as for orientation in three dimensional ‎space and underwater communications between individuals. The dolphin’s (Tursiops trunсatus) sonar func-‎tioning in complicated conditions of acoustic noise of the dolphin sonar is analyzed. It is shown that the basic ‎mechanisms that provide noise immunity of the dolphin sonar are: the radiation of broadband pulses with ‎zero carrier, use of burst (accumulation), burst rate variable repetition (time selection), and burst with interval-‎time coding. Possible ways of constructing of broadband underwater transducers and arrays capable to ‎radiate acoustic signals similar to echolocation impulses of cetaceans are considered. Analyzed in the paper is ‎functioning of two electrically operated models of broadband transducers: rod with phased excitation of ‎sections and waveguide type transducer in the form of a coaxial set of piezoactive rings. Some results of ‎solving synthesis and analysis problems for the above models of transducers are presented. It is shown that ‎these transducers provide bandwidth, respectively, 1.5–2 octaves and 2–3 octaves and more.‎

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