PARAMETRIC SONAR SYSTEM WITH FUNCTION FOR ACQUIRING ACOUSTIC IMAGE OF TARGETS Russian patent published in 2013 - IPC G01S15/42 

FIELD: physics.

SUBSTANCE: in the disclosed parametric sonar system, low-frequency probing signals are emitted via nonlinear frequency conversion in water from a radiator which creates an exposure sector, and probing signals reflected from underwater targets are received by a low-frequency signal receiver and a receiver for the initial high-frequency signals. Determination of the location of the detected target and motion parameters thereof within the exposure sector, as well as formation of an acoustic image of the detected object are carried out in an electronic data processing system based on angles and the time of arrival of probing signals reflected from the target at the low-frequency signal receiver and the receiver for the initial high-frequency signals, respectively, relative the time for emission of the probing signal taking into account the speed of sound in water and the known position of the radiator and the receivers. The electronic system consists of interconnected units for emitting and receiving signals and displaying on a monitor screen parameters of detected targets (location, speed), paths thereof in the secure area and the acoustic image of the detected object.

EFFECT: longer range for detecting underwater targets and obtaining an acoustic image of the detected object.

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