GB1309902A - Fish-finding apparatus - Google Patents

Fish-finding apparatus

Info

Publication number
GB1309902A
GB1309902A GB1309902DA GB1309902A GB 1309902 A GB1309902 A GB 1309902A GB 1309902D A GB1309902D A GB 1309902DA GB 1309902 A GB1309902 A GB 1309902A
Authority
GB
United Kingdom
Prior art keywords
echoes
fish
transducer
frequency
polarity
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
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.)
National Research Development Corp UK
Original Assignee
National Research Development Corp UK
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 National Research Development Corp UK filed Critical National Research Development Corp UK
Publication of GB1309902A publication Critical patent/GB1309902A/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
    • 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
    • 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)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

1309902 Echo sounders NATIONAL RESEARCH DEVELOPMENT CORP 10 June 1970 [28 March 1969] 16540/69 Heading H4D In a fish-finding sonar "unsymmetrical" waves, i.e. waves the two halves of each cycle of which have different forms, are transmitted and the receiver includes means for determining the polarity of echoes, Unlike echoes from rigid solid objects, echoes from fish exhibit reversal of polarity. In an embodiment a transducer 3 emits pulses on a carrier frequency f and a transducer 6, on frequency f/2. The outputs of transducers 7, 8 are equalized and the composite signal from amplifier 11 is applied in parallel to Schmitt triggers 12, 13 set to levels +V, -V, see also, Fig. 2 (not shown), which are connected respectively to the normal and resetting inputs of a counter 15; the counter produces an output only for fish echoes. A single transmit-receive transducer may be employed. Frequency f is suitably 500 kHz.
GB1309902D 1969-03-28 1969-03-28 Fish-finding apparatus Expired GB1309902A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1654069 1969-03-28

Publications (1)

Publication Number Publication Date
GB1309902A true GB1309902A (en) 1973-03-14

Family

ID=10079153

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1309902D Expired GB1309902A (en) 1969-03-28 1969-03-28 Fish-finding apparatus

Country Status (1)

Country Link
GB (1) GB1309902A (en)

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees