FIELD: physics, acoustics.
SUBSTANCE: invention relates to sonar, specifically to passive methods for acoustic detection and location of underwater divers, and can be used in underwater search and rescue operations, protecting coastal structures and beaches on the water side or protecting underwater structures, as well as protecting ships at the anchoring berth, offshore oil platforms, port entrances, bridge abutments, channels and water areas at hydroelectric power stations. The method is based on detecting and picking up from the detected noise of the water area under investigation quasi-periodic modulations of unremovable low-frequency respiratory noises of the underwater diver caused by the rhythm of respiratory manoeuvres, the frequency of which lies in the range of 0.1-1 Hz.
EFFECT: longer detection range.
3 cl, 3 dwg
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