Abstract
he paper contains results of a in situ research main task of which was to
detect objects buried, partially or completely, in the sea bottom. Object
detecting technologies employing acoustic wave sources based on nonlinear
interaction of elastic waves require application of parametric sound
sources. Detection of objects buried in the sea bottom with the use of
classic hydroacoustic devices such as the sidescan sonar or multibeam
echosounder proves ineffective. Wave frequencies used in such devices are
generally larger than tens of kHz. This results in the fact that almost
the whole acoustic energy is reflected from the bottom. On the other hand,
parametric echosounders radiate waves with low frequency and narrow beam
patterns which ensure high spatial resolution and allows to penetrate the
sea bottom to depths of the order of tens of meters. This allows to detect
objects that can be interesting, among other things, from archaeological
or military point of view.
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