JPS55110975A - Fish detector for dragnet - Google Patents

Fish detector for dragnet

Info

Publication number
JPS55110975A
JPS55110975A JP1787779A JP1787779A JPS55110975A JP S55110975 A JPS55110975 A JP S55110975A JP 1787779 A JP1787779 A JP 1787779A JP 1787779 A JP1787779 A JP 1787779A JP S55110975 A JPS55110975 A JP S55110975A
Authority
JP
Japan
Prior art keywords
rope
ground rope
gain
signal
dragnet
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.)
Granted
Application number
JP1787779A
Other languages
Japanese (ja)
Other versions
JPS6012594B2 (en
Inventor
Fukutaro Takahashi
Kyozo Yamatani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kaijo Denki Co Ltd
Marine Instr Co Ltd
Original Assignee
Kaijo Denki Co Ltd
Marine Instr 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
Application filed by Kaijo Denki Co Ltd, Marine Instr Co Ltd filed Critical Kaijo Denki Co Ltd
Priority to JP54017877A priority Critical patent/JPS6012594B2/en
Publication of JPS55110975A publication Critical patent/JPS55110975A/en
Publication of JPS6012594B2 publication Critical patent/JPS6012594B2/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO 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
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/88—Sonar systems specially adapted for specific applications
    • G01S15/96—Sonar systems specially adapted for specific applications for locating fish

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

PURPOSE:To make possible separated recording of the seabottom and the ground rope through time control of gain in the reception of the echo signal of the ground rope on the dragnet. CONSTITUTION:The information obtained from the detection below 3 the net opening being dragged is transmitted to the ship and indicated on a recorder installed therein. The time control of the gain of the receiver 24 is made in such a manner that the gain of the receiver 24 is made higher up to the point slightly earier than the arrival time of the echo signal of the ground rope of the net 2 from the transmission time of the signal while lower up to the estimated arrival time of the echo signal from the side and the like of the ground rope following the arrival of signal from the rope. Thus, the ground rope can be recorded clearly separated from the seabottom.
JP54017877A 1979-02-20 1979-02-20 Fish finder for seine Expired JPS6012594B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54017877A JPS6012594B2 (en) 1979-02-20 1979-02-20 Fish finder for seine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54017877A JPS6012594B2 (en) 1979-02-20 1979-02-20 Fish finder for seine

Publications (2)

Publication Number Publication Date
JPS55110975A true JPS55110975A (en) 1980-08-27
JPS6012594B2 JPS6012594B2 (en) 1985-04-02

Family

ID=11955910

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54017877A Expired JPS6012594B2 (en) 1979-02-20 1979-02-20 Fish finder for seine

Country Status (1)

Country Link
JP (1) JPS6012594B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6289291U (en) * 1985-11-22 1987-06-08

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
NET RECORDER,MODEL FNR-200/400 MARK-2 *
SERVICE MANUAL,NET RECORDER,MODEL FNR-200/400 MARK-2=1977 *

Also Published As

Publication number Publication date
JPS6012594B2 (en) 1985-04-02

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