Title:
信号入射角度検出装置、信号の入射角度の検出方法およびスキャニングソナー
Document Type and Number:
Japanese Patent JP4031101
Kind Code:
B2
Abstract:
A transducer is constructed of a plurality of transducer elements which are arranged in multiple layers and columns forming as a whole a generally cylindrical shape. A scanning sonar employing the transducer thus constructed can be switched between horizontal scan mode in which a vertically focused beam having a narrow horizontal beam angle (high horizontal directivity) is steered around the transducer using all the transducer elements and vertical scan mode in which a horizontally focused beam having a narrow vertical beam angle (high vertical directivity) is steered in a vertical plane directed in a specified scan azimuth to find out the angle of incidence of a received signal. The horizontally focused beam is formed by using the transducer elements of specific columns centered on the specified scan azimuth. A vertical scan signal obtained in the vertical scan mode is multiplied by a chirp signal. A correlator provided in a succeeding stage converts the amount of Doppler shift into time data and determines the angle of incidence of the received signal.
Inventors:
Hiroshi Iino
Fukuoka Itsuo
Hayashi Tatsuo
Kyoo Ito
Fukuoka Itsuo
Hayashi Tatsuo
Kyoo Ito
Application Number:
JP1862898A
Publication Date:
January 09, 2008
Filing Date:
January 30, 1998
Export Citation:
Assignee:
FURUNO ELECTRIC COMPANY,LIMITED
International Classes:
G01S7/523; B06B1/06; G01S3/802; G01S15/00; G01S15/42; G10K11/34; G01S7/521; G01S7/527
Domestic Patent References:
| JP63007350B1 | ||||
| JP58139088A | ||||
| JP5288855A | ||||
| JP57101779A | ||||
| JP3231181A | ||||
| JP1162681U | ||||
| JP58127186A | ||||
| JP58096263A |
Attorney, Agent or Firm:
Hisao Komori