FIELD: physics, measurements.
SUBSTANCE: invention is related to hydroacoustics and may be used for protection of objects from the barrier side in water medium. According to method, signal is generated from hydroacoustic antenna arranged in the form of piezoelectric cable sections, ends of which are connected to radio frequency cable with the help of matching devices fed from common source, signal voltage is picked up from loading resistor and is sent through separating capacitor to inlet of alarm signal generator, object parametres are identified by results of analysis of spectral and time variation of signal.
EFFECT: higher reliability, higher sensitivity and validity of detection, lower probability of false alarm.
1 dwg
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