GB1391041A - Apparatus for the recognition of species of fish of a shoal - Google Patents

Apparatus for the recognition of species of fish of a shoal

Info

Publication number
GB1391041A
GB1391041A GB2538873A GB2538873A GB1391041A GB 1391041 A GB1391041 A GB 1391041A GB 2538873 A GB2538873 A GB 2538873A GB 2538873 A GB2538873 A GB 2538873A GB 1391041 A GB1391041 A GB 1391041A
Authority
GB
United Kingdom
Prior art keywords
species
echoes
shoal
fish
replicas
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.)
Expired
Application number
GB2538873A
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.)
Fried Krupp AG
Original Assignee
Fried Krupp AG
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 Fried Krupp AG filed Critical Fried Krupp AG
Publication of GB1391041A publication Critical patent/GB1391041A/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
    • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • G01S15/04—Systems determining presence of a target
    • 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
    • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • 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
    • G01S15/87—Combinations of sonar systems
    • 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
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/539—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
    • 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
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/56—Display arrangements
    • G01S7/62—Cathode-ray tube displays

Landscapes

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

Abstract

1391041 Sonar fishing aids FRIED KRUPP GmbH 29 May 1973 [30 May 1972] 25388/73 Heading H4D To assist a fisherman to identify objectively the species of fish in a shoal located by a sonar system, the system has provision for interrupting the normal display of fish echoes, repeatedly displaying a stored sequence of echoes received in an interval up to the moment of interruption, and comparing by circuitry the latter echoes with echo replicas characteristic of known fish species, the replicas being selected on a trial basis from a store by means of a console under the fisherman's control. In use the system is first used to locate the shoal by horizontal sounding from a trawler. During this location the echoes received in several sounding periods are displayed on a CRT or echograph. A magnified partial-range display of the stored shoal echoes of the latest sounding period is then obtained by actuation of an "identification" switch and scale-changing device (which may include a "light stylus" for selecting that part of the normal echo display to be magnified). The scale change is linked with a reduction of the transmitted pulse duration and of the transmission period, and with an increase in the transmission signal frequency. The console includes a panel of illuminated keys corresponding to various possible fish species, or includes an equivalent optical indication of species selectable by a light stylus. A gating circuit controls the console such that only those species which could possibly be present, for the prevailing geographical location of the trawler, season of the year, time of day, water temperature and salinity (the latter two parameters being measured by a probe lowered from the trawler), can be selected on the console. When the fisherman selects one of the possible species the displayed echoes are compared with the replica echoes for that species. If there is good conformity of the echoes a lamp lights; if not, further selection and comparisons are made until good conformity is obtained. The system is then used for vertical sounding to determine the depth of the shoal. The resulting echo signals and those from a sounder on the trawl net are fed to a device for controlling the net position for aiming the net at the shoal. If no good conformity of the current shoal echo signals with the replicas is obtained during the above comparisons for any of the selections, the species of fish is identified by sampling the catch and the current echo signals are added as new replicas to the existing store of replicas.
GB2538873A 1972-05-30 1973-05-29 Apparatus for the recognition of species of fish of a shoal Expired GB1391041A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2226193A DE2226193A1 (en) 1972-05-30 1972-05-30 DEVICE FOR DETECTING THE SPECIES OF FISH OF A SCHOOL

Publications (1)

Publication Number Publication Date
GB1391041A true GB1391041A (en) 1975-04-16

Family

ID=5846267

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2538873A Expired GB1391041A (en) 1972-05-30 1973-05-29 Apparatus for the recognition of species of fish of a shoal

Country Status (3)

Country Link
JP (1) JPS4984883A (en)
DE (1) DE2226193A1 (en)
GB (1) GB1391041A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2291069A1 (en) * 2005-06-01 2008-02-16 Zunibal, S.L. Sonar network has three parts, which are connected with each other by data cables, where former part consists of computer and interface box, later part is sound box network arranged in machine room and third part includes transducers

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1591756A (en) * 1976-05-19 1981-06-24 Koden Electronics Co Ltd Fish-finder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2291069A1 (en) * 2005-06-01 2008-02-16 Zunibal, S.L. Sonar network has three parts, which are connected with each other by data cables, where former part consists of computer and interface box, later part is sound box network arranged in machine room and third part includes transducers

Also Published As

Publication number Publication date
DE2226193A1 (en) 1974-01-24
JPS4984883A (en) 1974-08-14

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee