SHIPBORNE SONAR Russian patent published in 2001 - IPC

FIELD: under water acoustic navigation equipment, detection and location of underwater objects. SUBSTANCE: technical result of invention lies in reduction of dimensions of blind area of shipborne sonar caused by reverberation of sea and enhanced probability of determination of coordinates of underwater objects including maintenance of hydroacoustic contact with them with rise of speed of ship- carrier of sonar persuing object evading detection. Shipborne sonar has radiating acoustic antenna, generator of frequency modulation of signals, receiving acoustic antenna, mixer, unit of amplifiers and multichannel spectrum analyzer connected in series and video amplifier and plan-position indicator connected in series. Second input of the latter is connected to second output of receiving antenna. Sonar is additionally fitted with second generator, receiver, transmitter, operation mode switch, computer, three OR gates, NOT gate and four AND gates. First output of operation mode switch is connected to input of video amplifier via first AND gate, computer and first OR gate whose second input is linked to output of spectrum analyzer via second AND gate. Second input of second AND gate is connected to first output of operation mode switch, second input of mixer is connected to first output of operation mode switch via receiver, second generator and second OR gate which second input is connected to output of first generator via third AND gate. Second input of third AND gate is connected to output of NOT gate. Second output of operation mode switch is linked to input of transmitter via fourth AND gate which second input is connected to output of third AND gate. Third input of plan-position indicator is connected to output of second generator via third OR gate whose second input is linked to output of radiating antenna. Second input of AND gate is connected to output of spectrum analyzer, input of radiating antenna is connected to output of third AND gate Second input of computer is connected to second output of receiving acoustic antenna. EFFECT: reduced dimensions of " blind " area of shipborne sonar. 1 dwg