JPS5780582A - Measurement of distance to sea bottom from transponder - Google Patents

Measurement of distance to sea bottom from transponder

Info

Publication number
JPS5780582A
JPS5780582A JP55157283A JP15728380A JPS5780582A JP S5780582 A JPS5780582 A JP S5780582A JP 55157283 A JP55157283 A JP 55157283A JP 15728380 A JP15728380 A JP 15728380A JP S5780582 A JPS5780582 A JP S5780582A
Authority
JP
Japan
Prior art keywords
distance
sea bottom
transponder
discrete value
incidence
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
JP55157283A
Other languages
Japanese (ja)
Inventor
Kiyomi Minohara
Atsushi Abe
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.)
Furuno Electric Co Ltd
Original Assignee
Furuno Electric 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 Furuno Electric Co Ltd filed Critical Furuno Electric Co Ltd
Priority to JP55157283A priority Critical patent/JPS5780582A/en
Publication of JPS5780582A publication Critical patent/JPS5780582A/en
Pending 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
    • G01S15/74—Systems using reradiation of acoustic waves, e.g. IFF, i.e. identification of friend or foe

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (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 inspect easily how a fishing net sinks by measuring the distance to the sea bottom from a transponder utilizing a plurality of response signals from the transponder provided on the net. CONSTITUTION:An ultrasonic signal is transmitted to a transponder T underwater from a transmitter/receiver S1 equipped on a ship to obtain a discrete value 2n1 corresponding to the incoming and outgoing distance based on the time covered until a response signal wave from T reaches S1. A discrete value (n1+ n2) is obtained corresponding to the sum of the distance from S1 to T and the distance from T1 to S1 via the sea bottom surface 7 based on the time covered until the reflected response signal wave reaches S1 when the angle theta of incidence from T to the sea bottom surface 7 equals the angle theta' of incidence from the surface 7 to S1. A discrete value n3 is obtained corresponding to the water depth Df from S2 and the equation d=(n2<2>-n1<2>)/4n3 is computed to find the distance d from T to the sea bottom.
JP55157283A 1980-11-07 1980-11-07 Measurement of distance to sea bottom from transponder Pending JPS5780582A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55157283A JPS5780582A (en) 1980-11-07 1980-11-07 Measurement of distance to sea bottom from transponder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55157283A JPS5780582A (en) 1980-11-07 1980-11-07 Measurement of distance to sea bottom from transponder

Publications (1)

Publication Number Publication Date
JPS5780582A true JPS5780582A (en) 1982-05-20

Family

ID=15646273

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55157283A Pending JPS5780582A (en) 1980-11-07 1980-11-07 Measurement of distance to sea bottom from transponder

Country Status (1)

Country Link
JP (1) JPS5780582A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58177816U (en) * 1982-05-21 1983-11-28 日本無線株式会社 fishing net depth display device
JPS5946876A (en) * 1982-09-11 1984-03-16 Furuno Electric Co Ltd Net position detector
JPH07333331A (en) * 1994-06-14 1995-12-22 Tech Res & Dev Inst Of Japan Def Agency Accoustic position measuring equipment based on correlation

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58177816U (en) * 1982-05-21 1983-11-28 日本無線株式会社 fishing net depth display device
JPH04253Y2 (en) * 1982-05-21 1992-01-07
JPS5946876A (en) * 1982-09-11 1984-03-16 Furuno Electric Co Ltd Net position detector
JPH0153751B2 (en) * 1982-09-11 1989-11-15 Furuno Electric Co
JPH07333331A (en) * 1994-06-14 1995-12-22 Tech Res & Dev Inst Of Japan Def Agency Accoustic position measuring equipment based on correlation

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