FIELD: underwater acoustics. SUBSTANCE: invention refers to aids of active detection of objects positioned in various environment. Parametric echo-pulse sonar is meant for increased noise immunity and accuracy of direction finding which is achievable technical result. It is supplemented by multiplier installed in high-frequency reception path between detector and second input of indicator and by two circuits of filter, amplifier and detector connected in series which inputs are linked to output of reception acoustic high- frequency converter and which outputs are connected to other inputs of multiplier. EFFECT: increased noise immunity and accuracy of direction finding. 2 dwg
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