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JPS54136294A - Ievel measurement unit of correlation signal - Google Patents

Ievel measurement unit of correlation signal

Info

Publication number
JPS54136294A
JPS54136294A JP4451578A JP4451578A JPS54136294A JP S54136294 A JPS54136294 A JP S54136294A JP 4451578 A JP4451578 A JP 4451578A JP 4451578 A JP4451578 A JP 4451578A JP S54136294 A JPS54136294 A JP S54136294A
Authority
JP
Japan
Prior art keywords
code
correlation
artificial random
peak
unit
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
JP4451578A
Other languages
Japanese (ja)
Inventor
Yukio Kobayashi
Nobuyuki Tokura
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP4451578A priority Critical patent/JPS54136294A/en
Publication of JPS54136294A publication Critical patent/JPS54136294A/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
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/06—Systems determining position data of a target
    • G01S13/08—Systems for measuring distance only
    • G01S13/32—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
    • G01S13/325—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of coded signals, e.g. P.S.K. signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

PURPOSE:To detect the peak level of the correlation function with less number of sampling easily, by taking the correlation between two artificial random codes which are shifted by unit code time from the demodulated output, in the radar or the like modulating the carrier with the artificial random code. CONSTITUTION:The output modulation signal C modulating the carrier signal A with the artificial random code caused by the artificial random code generator 14 is delivered to space 15, the reception signal D is demodulated at the demodulator 17, and the demodulation signal E takes correlation G with the artificial random code F delayed by the propagation time from the code B at the first correlator 18, at the first delay circuit 19. On the other hand, the code F is the code H delayed further at the second delay circuit 24 by unit code time, and takes the corelation I with the demodulation signal E at the second correlator 25. The correlation outputs G and I are added at the addition circuit 26 and the addition output J having the definite value(unit time distance) for the peak part is obtained. By sampling this with the peak detector 27 by 1/2 period of the unit code, complicated circuit functions are not required and the peak can easily be detected.
JP4451578A 1978-04-14 1978-04-14 Ievel measurement unit of correlation signal Pending JPS54136294A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4451578A JPS54136294A (en) 1978-04-14 1978-04-14 Ievel measurement unit of correlation signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4451578A JPS54136294A (en) 1978-04-14 1978-04-14 Ievel measurement unit of correlation signal

Publications (1)

Publication Number Publication Date
JPS54136294A true JPS54136294A (en) 1979-10-23

Family

ID=12693674

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4451578A Pending JPS54136294A (en) 1978-04-14 1978-04-14 Ievel measurement unit of correlation signal

Country Status (1)

Country Link
JP (1) JPS54136294A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01257288A (en) * 1987-11-24 1989-10-13 Japan Radio Co Ltd Fish detector
WO2011058527A1 (en) * 2009-11-16 2011-05-19 Nordic Sonar Ou Method and apparatus for processing sonar signals

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01257288A (en) * 1987-11-24 1989-10-13 Japan Radio Co Ltd Fish detector
WO2011058527A1 (en) * 2009-11-16 2011-05-19 Nordic Sonar Ou Method and apparatus for processing sonar signals

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