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JPS57153280A - Sonar - Google Patents

Sonar

Info

Publication number
JPS57153280A
JPS57153280A JP3891981A JP3891981A JPS57153280A JP S57153280 A JPS57153280 A JP S57153280A JP 3891981 A JP3891981 A JP 3891981A JP 3891981 A JP3891981 A JP 3891981A JP S57153280 A JPS57153280 A JP S57153280A
Authority
JP
Japan
Prior art keywords
pulse
sea bottom
transmission
pulses
train
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
JP3891981A
Other languages
Japanese (ja)
Inventor
Shozo Uchihashi
Shozo Shibuya
Tadao Hayashi
Kazuo Yamauchi
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 JP3891981A priority Critical patent/JPS57153280A/en
Publication of JPS57153280A publication Critical patent/JPS57153280A/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
    • G01S15/88—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 transmit periodically detecting pulses efficiently, by making the transmitting period of ultrasonic pulses coincident approximately with the depth of the sea bottom and transmitting it. CONSTITUTION:An X-axis counter 10 performs counting on the basis of a divided pulse (a) of a frequency dividing circuit 23 till the detection of a sea bottom pulse and counts a pulse train of a clock pulse source 14 after the sea bottom pulse is detected to reset a flip-flop 20. The counter 10 transmits an output pulse when the count value becomes mX, and the next transmission pulse is generated by this output pulse. Since the pulse train of the clock pulse source 14 has a period shorter than that of the pulse train of the frequency dividing circuit 23, transmission pulses are transmitted at intervals of a short time after the detection of the sea bottom pulse; and as a result, the transmission pulse is transmitted in a time equal to the time from the transmission of the ultrasonic pulse to the receiving of the sea bottom pulse.
JP3891981A 1981-03-17 1981-03-17 Sonar Pending JPS57153280A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3891981A JPS57153280A (en) 1981-03-17 1981-03-17 Sonar

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3891981A JPS57153280A (en) 1981-03-17 1981-03-17 Sonar

Publications (1)

Publication Number Publication Date
JPS57153280A true JPS57153280A (en) 1982-09-21

Family

ID=12538617

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3891981A Pending JPS57153280A (en) 1981-03-17 1981-03-17 Sonar

Country Status (1)

Country Link
JP (1) JPS57153280A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62153782A (en) * 1985-12-27 1987-07-08 Fuji Electric Co Ltd Ultrasonic distance measuring device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62153782A (en) * 1985-12-27 1987-07-08 Fuji Electric Co Ltd Ultrasonic distance measuring device

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