Communications – electrical: acoustic wave systems and devices – Beam stabilization or compensation
Reexamination Certificate
2007-03-20
2007-03-20
Pihulic, Dan (Department: 3662)
Communications, electrical: acoustic wave systems and devices
Beam stabilization or compensation
Reexamination Certificate
active
11099574
ABSTRACT:
A quantitative echo sounder includes delay circuits, phase correction circuits, an incidence angle calculator and a directivity correction unit. The delay circuits adjust transmission start timing or phases of acoustic waves radiated by individual vibrating elements based on pitch and roll angles measured by a motion sensing device so that the direction of an acoustic axis of a transmitting beam matches a sounding direction. The phase correction circuits adjust phases of received echo signals based on the pitch and roll angles so that the direction of an acoustic axis of a receiving beam matches the sounding direction. The incidence angle calculator calculates echo signal incidence angle with respect to the sounding direction from phase differences among receiving beam signals obtained by four vibrating element groups. The directivity correction unit corrects a measured target strength by using the echo signal incidence angle calculated by the incidence angle calculator.
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Kinoshita Youhei
Kubota Osamu
Misonoo Satoshi
Onishi Yuriko
Satoh Takanori
Furuno Electric Company Ltd.
Pihulic Dan
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