Underwater sounding apparatus

Details Underwater sounding apparatus Underwater sounding apparatus

2007-01-16

2007-01-16

Lobo, Ian J. (Department: 3662)

Communications, electrical: acoustic wave systems and devices

Underwater system

C367S901000, C381S071100, C381S094100

Reexamination Certificate

active

10995268

ABSTRACT:
While keeping a propeller located in a negative direction of a y-axis turning, transmission of acoustic waves from vibrating elements of a transducer unit is interrupted. Reference signals “A” and “B” which are receiving beam signals having principal acoustic axes oriented in a propeller direction are generated from received signals obtained by “A” and “B” group vibrating elements, respectively. Next, adjustment factors used for removing propeller noise from received signals obtained by vibrating elements on positive and negative sides of an x-axis are calculated by performing arithmetic operation on time-series data on the received signals obtained by the positive and negative sides vibrating elements and on time-series data on the reference signals “A” and “B”, respectively. When performing underwater sounding operation by transmitting acoustic waves, a product of the reference signal “A” or “B” and the adjustment factor is subtracted from the received signal obtained by each of the positive and negative sides vibrating elements, respectively.

REFERENCES:
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patent: 2003-84060 (2003-03-01), None
patent: 2003-202370 (2003-07-01), None

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