PHASE PARAMETRIC SONAR Russian patent published in 1997 - IPC

FIELD: echo-sounding measuring systems, intended for classifying of bottom deposits and for detection and classifying of bottom and bottomside objects according to the acoustic impedance. SUBSTANCE: phase parametric sonar uses series-connected synchronizer 1, RF pulse generator 2, power amplifier 3, radiator 4, series-connected phase-shift meter 10 and indicator 11, two selective amplifiers 8 and 9, whose outputs are connected to the respective inputs of phase-shifter 10. The sonar has control signal generator 5 and series-connected audio-frequency antenna 6 and difference frequency signal amplifier 7, whose output is connected to the inputs of selective amplifiers 8 and 9, the control input of the first of them is connected to the first control output of RF pulse generator 2, and the control input of the other - to the output of control signal generator 5, whose two inputs are connected respectively to the two control outputs of RF pulse generator 2. The phase parametric sonar features a wide operating frequency band (more than an octave). EFFECT: enhanced accuracy and truth of the results of echo-signal phase-shift measurement. 3 cl, 11 dwg