JPS57124267A - Elimination system for noise of sonar - Google Patents

Elimination system for noise of sonar

Info

Publication number
JPS57124267A
JPS57124267A JP897181A JP897181A JPS57124267A JP S57124267 A JPS57124267 A JP S57124267A JP 897181 A JP897181 A JP 897181A JP 897181 A JP897181 A JP 897181A JP S57124267 A JPS57124267 A JP S57124267A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
signals
oscillation
sonar
hull
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP897181A
Inventor
Kazuhiko Nitori
Original Assignee
Oki Electric Ind Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S3/00Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/80Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using ultrasonic, sonic or infrasonic waves
    • G01S3/86Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using ultrasonic, sonic or infrasonic waves with means for eliminating undesired waves, e.g. disturbing noises

Abstract

PURPOSE:To effectively eliminate the oscillation components of the hull of a warship mixed into a receiver output signal, by detecting the oscillation of the wall of the hull by oscillation sensors and by controlling the characteristics of adaptive filters. CONSTITUTION:Oscillation sensors 21-2N convert oscillations, propagating the wall of the hull, into electric signals and output them. The output signals of the sensors are inputted to adaptive filters 31-3N, whose output signals are subtracted out of the output signals of receivers 11-1N; the resulting difference signals are applied to the character control input terminals of the adaptive filters, and the characteristics of the filters are controlled to minimize the electric power of the difference signals. Consequently, oscillation components in the difference signals are nearly eliminated and signal components are not influenced much. For this purpose, those signals (output signals of substraters 41-4N) are inputted to a sonar signal processor 5 to perform normal signal processing of the sonar, thus obtaining a sonar signal free of self-noise.
JP897181A 1981-01-26 1981-01-26 Elimination system for noise of sonar Pending JPS57124267A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP897181A JPS57124267A (en) 1981-01-26 1981-01-26 Elimination system for noise of sonar

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP897181A JPS57124267A (en) 1981-01-26 1981-01-26 Elimination system for noise of sonar

Publications (1)

Publication Number Publication Date
JPS57124267A true true JPS57124267A (en) 1982-08-03

Family

ID=11707565

Family Applications (1)

Application Number Title Priority Date Filing Date
JP897181A Pending JPS57124267A (en) 1981-01-26 1981-01-26 Elimination system for noise of sonar

Country Status (1)

Country Link
JP (1) JPS57124267A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2663489A1 (en) * 1990-06-15 1991-12-20 Thomson Csf Method of acoustic detection of low frequency signals.
FR2772472A1 (en) * 1997-12-17 1999-06-18 France Etat A method and acoustic detection device of aliasing source of presence at low signal to noise ratio
JP2015117944A (en) * 2013-12-16 2015-06-25 三菱重工業株式会社 Hydrospace detection device and hydrospace detection method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3599142A (en) * 1969-05-28 1971-08-10 Honeywell Inc Control apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3599142A (en) * 1969-05-28 1971-08-10 Honeywell Inc Control apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2663489A1 (en) * 1990-06-15 1991-12-20 Thomson Csf Method of acoustic detection of low frequency signals.
WO1991019996A1 (en) * 1990-06-15 1991-12-26 Thomson-Csf Low-frequency signal acoustic detection method
FR2772472A1 (en) * 1997-12-17 1999-06-18 France Etat A method and acoustic detection device of aliasing source of presence at low signal to noise ratio
EP0926657A1 (en) * 1997-12-17 1999-06-30 ETAT FRANCAIS Représenté par le délégué général pour l'armement Method and apparatus for acoustic detection of a signal with a low signal-to-noise ratio, in the presence of a noise source
JP2015117944A (en) * 2013-12-16 2015-06-25 三菱重工業株式会社 Hydrospace detection device and hydrospace detection method

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