JPS5462857A - Sonar - Google Patents

Sonar

Info

Publication number
JPS5462857A
JPS5462857A JP12993177A JP12993177A JPS5462857A JP S5462857 A JPS5462857 A JP S5462857A JP 12993177 A JP12993177 A JP 12993177A JP 12993177 A JP12993177 A JP 12993177A JP S5462857 A JPS5462857 A JP S5462857A
Authority
JP
Japan
Prior art keywords
distance
signal
frequency
linear modulated
frequency linear
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
JP12993177A
Other languages
Japanese (ja)
Other versions
JPS5944593B2 (en
Inventor
Masahiro Hisada
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP12993177A priority Critical patent/JPS5944593B2/en
Publication of JPS5462857A publication Critical patent/JPS5462857A/en
Publication of JPS5944593B2 publication Critical patent/JPS5944593B2/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
    • G01S15/06—Systems determining the position data of a target
    • G01S15/08—Systems for measuring distance only
    • G01S15/32—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
    • G01S15/34—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal

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)
  • Radar Systems Or Details Thereof (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

PURPOSE:To correct distance measurement errors satisfactorily by calculating Doppler deviations from the frequency linear modulated receiving waves reflected from the target and correcting the distance of the target object. CONSTITUTION:The transmitting frequency linear modulated signal and the receiving frequency linear modulated signal reflected from the target are mixed and low- pass-filtered with the mixer and low-pass filter 8 of an operator I and the signal proportinal to the frequency difference of the transmitting and receiving frequency linear modulated signals corresponding to an apparent distance is applied to a distance scanner 10. On the other hand, the receiving frequency linear modulated signal is applied to a differentiation circuit 13 via the frequency-voltage converter 12 of an operator II and the circuit 13 generates a frequency change rate signal, from which the speed of the target object is calculated by an arithmetic circuit 14. Next, a Doppler deviation is operated and determined in an arithmetic circit 15 and the output signal of the distance corrector 16 which calculates the distance correction signal with the Dopper deviation as a function is applied to the scanner 10. In a display device 11, the distance of a small error in which errors owing to the Doppler deviations of the target object are corrected is displayed.
JP12993177A 1977-10-28 1977-10-28 sonar Expired JPS5944593B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12993177A JPS5944593B2 (en) 1977-10-28 1977-10-28 sonar

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12993177A JPS5944593B2 (en) 1977-10-28 1977-10-28 sonar

Publications (2)

Publication Number Publication Date
JPS5462857A true JPS5462857A (en) 1979-05-21
JPS5944593B2 JPS5944593B2 (en) 1984-10-30

Family

ID=15021953

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12993177A Expired JPS5944593B2 (en) 1977-10-28 1977-10-28 sonar

Country Status (1)

Country Link
JP (1) JPS5944593B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5664670A (en) * 1979-10-15 1981-06-01 Raytheon Co Reflection signal measuring apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015136823A1 (en) 2014-03-11 2015-09-17 日本電気株式会社 Target extraction system, target extraction method, and information processing device and control method and control program for same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5664670A (en) * 1979-10-15 1981-06-01 Raytheon Co Reflection signal measuring apparatus
JPH0553381B2 (en) * 1979-10-15 1993-08-09 Raytheon Co

Also Published As

Publication number Publication date
JPS5944593B2 (en) 1984-10-30

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