GB1380451A - Method and system for electromagnetic detection with correlation - Google Patents

Method and system for electromagnetic detection with correlation

Info

Publication number
GB1380451A
GB1380451A GB3320172A GB3320172A GB1380451A GB 1380451 A GB1380451 A GB 1380451A GB 3320172 A GB3320172 A GB 3320172A GB 3320172 A GB3320172 A GB 3320172A GB 1380451 A GB1380451 A GB 1380451A
Authority
GB
United Kingdom
Prior art keywords
radar
correlation
code
reference signal
gates
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
GB3320172A
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Publication of GB1380451A publication Critical patent/GB1380451A/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
    • 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
    • G01S13/10—Systems for measuring distance only using transmission of interrupted, pulse modulated waves
    • G01S13/26—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave
    • G01S13/28—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave with time compression of received pulses
    • G01S13/284—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave with time compression of received pulses using coded pulses
    • 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)

Abstract

1380451 Radar THOMSON-CSF 14 July 1972 [16 July 1971] 33201/72 Heading H4D In order to avoid distortion of the correlation function of a binary code modulated radar due to short range effects, the duration of the binary digits of the correlation reference signal are made shorter than the transmitted code and the reference signal is bipolar. In a C.W. phase modulated radar, the transmitter carrier is modulated in phase according to a pseudorandom code, Figs. 3A-3B. Clock 1, Fig. 5, drives a code generator 2 which feeds the radar transmitter 4. The code passes through a delay 5 of length T 2 , the desired range gating, to AND gate 6 and through inverter 7 to AND gate 8. The clock pulses are also fed through a delay 3 of length T 4 to the AND gates 6, 8. The outputs L, M of the two gates represent the positive and negative pulses in the reference signal. These trains are passed to gates 10, 11 where they are compared to the received signals supplied from radar receiver 9. The correlation is completed by differential amplifier 12 and processor 13 which includes Doppler filtering, detection and integration stages. This method of correlation reduces the variation in the autocorrelation function to a trapezium of amplitude T 3 /T 1 where T 3 is the clock pulse width and T 1 the clock pulse period. Over short ranges for example when used in a proximity fuse, the distortion of the autocorrelation function due to the <SP>1</SP>/d<SP>4</SP> term in the radar equation is greatly reduced (Fig. 1, not shown). Similar results obtain when using a phase modulated pulse radar (Fig. 4, not shown).
GB3320172A 1971-07-16 1972-07-14 Method and system for electromagnetic detection with correlation Expired GB1380451A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7126187A FR2146105B1 (en) 1971-07-16 1971-07-16

Publications (1)

Publication Number Publication Date
GB1380451A true GB1380451A (en) 1975-01-15

Family

ID=9080497

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3320172A Expired GB1380451A (en) 1971-07-16 1972-07-14 Method and system for electromagnetic detection with correlation

Country Status (3)

Country Link
DE (1) DE2234707C3 (en)
FR (1) FR2146105B1 (en)
GB (1) GB1380451A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5115247A (en) * 1988-02-16 1992-05-19 Honeywell Inc. Frequency modulated, phase coded radar
GB2337387A (en) * 1998-04-29 1999-11-17 Mitel Semiconductor Ltd Radar movement sensor
EP1777546A1 (en) * 2005-10-24 2007-04-25 Mitsubishi Electric Information Technology Centre Europe B.V. Objet detection
US9035824B2 (en) 2012-02-24 2015-05-19 Thales System and method of radar location

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2709757C1 (en) * 1977-03-07 1991-06-13 Siemens Ag Radar system for interference signal suppression with an adaptive antenna array antenna
FR2575820B1 (en) * 1985-01-10 1992-07-24 Equip Construction Electriq METHOD AND DEVICE FOR MEASURING THE DISTANCE BETWEEN A TARGET AND A SENSOR

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5115247A (en) * 1988-02-16 1992-05-19 Honeywell Inc. Frequency modulated, phase coded radar
GB2337387A (en) * 1998-04-29 1999-11-17 Mitel Semiconductor Ltd Radar movement sensor
EP1777546A1 (en) * 2005-10-24 2007-04-25 Mitsubishi Electric Information Technology Centre Europe B.V. Objet detection
WO2007049014A1 (en) * 2005-10-24 2007-05-03 Mitsubishi Electric Information Technology Centre Europe B.V. Object detection
US8154436B2 (en) 2005-10-24 2012-04-10 Mitsubishi Electric Information Technology Centre Europe B.V. Object detection
US9035824B2 (en) 2012-02-24 2015-05-19 Thales System and method of radar location

Also Published As

Publication number Publication date
FR2146105A1 (en) 1973-03-02
DE2234707B2 (en) 1974-04-18
DE2234707C3 (en) 1974-11-21
DE2234707A1 (en) 1973-01-18
FR2146105B1 (en) 1975-10-10

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Legal Events

Date Code Title Description
PS Patent sealed