Title:
水中探知装置
Document Type and Number:
Japanese Patent JP4307223
Kind Code:
B2
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.
Inventors:
Satoshi Okunishi
Yasushi Nishimori
Kyoo Ito
Yasushi Nishimori
Kyoo Ito
Application Number:
JP2003399235A
Publication Date:
August 05, 2009
Filing Date:
November 28, 2003
Export Citation:
Assignee:
FURUNO ELECTRIC COMPANY,LIMITED
International Classes:
G01S7/526; G01S7/521; G01S7/527; G01S7/536; G01S15/96
Domestic Patent References:
| JP1131182U | ||||
| JP2000019252A | ||||
| JP3017583A | ||||
| JP6347539A | ||||
| JP10282203A |
Attorney, Agent or Firm:
Hideyuki Okumura