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    • 5. 发明专利
    • ACTIVE SONAR DEVICE
    • JP2001272459A
    • 2001-10-05
    • JP2000087526
    • 2000-03-27
    • NEC CORP
    • ODA KOJI
    • G01S7/527G01S7/536G01S15/02
    • PROBLEM TO BE SOLVED: To remove noise from not only this ship, but also other ships and to remove noise even if the noise source is in the same direction with a target. SOLUTION: This device is equipped with a switch 21, a reflected wave memory circuit 22, a noise wave memory circuit 25, and a noise extracting circuit 26 for removal which divide on the time base a reflected wave obtained by sending a sound wave into water from a transmission and reception part 1 and extract the partial noise wave of the part having the highest waveform correlativity as noise wave data 106 for removal from a noise wave obtained when the sound wave is not sent as to plural divided unit reflected waves 102, and a subtraction processing circuit 23 and a buffer circuit 24 which sequentially generate noise-removed unit reflected waves 105 by performing amplitude subtraction processing for the noise wave data 106 for removal from corresponding unit reflected waves 102, convert the noise-ed unit reflected waves 105 into a continuous receive reflected wave signal, and outputs it to a receive signal processing part 3.