FR2353864A1 - Elimination of fixed and parasitic radar images - involves digital processing of echo phase comparison circuit outputs, and use of reference signal - Google Patents

Elimination of fixed and parasitic radar images - involves digital processing of echo phase comparison circuit outputs, and use of reference signal

Info

Publication number
FR2353864A1
FR2353864A1 FR7616462A FR7616462A FR2353864A1 FR 2353864 A1 FR2353864 A1 FR 2353864A1 FR 7616462 A FR7616462 A FR 7616462A FR 7616462 A FR7616462 A FR 7616462A FR 2353864 A1 FR2353864 A1 FR 2353864A1
Authority
FR
France
Prior art keywords
echoes
reference signal
signals
parasitic
fixed
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
FR7616462A
Other languages
French (fr)
Other versions
FR2353864B1 (en
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.)
Raytheon Co
Original Assignee
Raytheon Co
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 Raytheon Co filed Critical Raytheon Co
Priority to FR7616462A priority Critical patent/FR2353864A1/en
Publication of FR2353864A1 publication Critical patent/FR2353864A1/en
Application granted granted Critical
Publication of FR2353864B1 publication Critical patent/FR2353864B1/fr
Granted 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
    • G01S13/50—Systems of measurement based on relative movement of target
    • G01S13/52—Discriminating between fixed and moving objects or between objects moving at different speeds
    • G01S13/522—Discriminating between fixed and moving objects or between objects moving at different speeds using transmissions of interrupted pulse modulated waves
    • G01S13/524—Discriminating between fixed and moving objects or between objects moving at different speeds using transmissions of interrupted pulse modulated waves based upon the phase or frequency shift resulting from movement of objects, with reference to the transmitted signals, e.g. coherent MTi
    • G01S13/526—Discriminating between fixed and moving objects or between objects moving at different speeds using transmissions of interrupted pulse modulated waves based upon the phase or frequency shift resulting from movement of objects, with reference to the transmitted signals, e.g. coherent MTi performing filtering on the whole spectrum without loss of range information, e.g. using delay line cancellers or comb filters
    • 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
    • G01S13/50—Systems of measurement based on relative movement of target
    • G01S13/52—Discriminating between fixed and moving objects or between objects moving at different speeds
    • G01S13/522—Discriminating between fixed and moving objects or between objects moving at different speeds using transmissions of interrupted pulse modulated waves
    • G01S13/524—Discriminating between fixed and moving objects or between objects moving at different speeds using transmissions of interrupted pulse modulated waves based upon the phase or frequency shift resulting from movement of objects, with reference to the transmitted signals, e.g. coherent MTi
    • G01S13/5244—Adaptive clutter cancellation

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

Fixed object return radar echoes with a constant phase relationship to a reference signal while moving objects return variable phase signals. The phase comparison of these signals is converted into digital words for elimination of fixed and parasitic echoes while retaining moving target echoes. It-phase and quadrature radar signal resulting from reception of echoes are compared (37) with reference signal phasing to produce signals (39, 41) which are then converted (10) from analogue signals into digital words. These workds give echo distance and are processed (48, 50) by combining part of workd from one exploration with part of another exploration to produce correction signals representing average Doppler speed. Further combination and processing is effected to eliminate parasitic moving echoes.
FR7616462A 1976-06-01 1976-06-01 Elimination of fixed and parasitic radar images - involves digital processing of echo phase comparison circuit outputs, and use of reference signal Granted FR2353864A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7616462A FR2353864A1 (en) 1976-06-01 1976-06-01 Elimination of fixed and parasitic radar images - involves digital processing of echo phase comparison circuit outputs, and use of reference signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7616462A FR2353864A1 (en) 1976-06-01 1976-06-01 Elimination of fixed and parasitic radar images - involves digital processing of echo phase comparison circuit outputs, and use of reference signal

Publications (2)

Publication Number Publication Date
FR2353864A1 true FR2353864A1 (en) 1977-12-30
FR2353864B1 FR2353864B1 (en) 1982-05-21

Family

ID=9173829

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7616462A Granted FR2353864A1 (en) 1976-06-01 1976-06-01 Elimination of fixed and parasitic radar images - involves digital processing of echo phase comparison circuit outputs, and use of reference signal

Country Status (1)

Country Link
FR (1) FR2353864A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2548385A1 (en) * 1983-06-16 1985-01-04 Mitsubishi Electric Corp RADAR COMPRISING A FIXED ECHO ELIMINATOR

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2130388A1 (en) * 1971-03-17 1972-11-03 Int Standard Electric Corp

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2130388A1 (en) * 1971-03-17 1972-11-03 Int Standard Electric Corp

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NV2180/72 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2548385A1 (en) * 1983-06-16 1985-01-04 Mitsubishi Electric Corp RADAR COMPRISING A FIXED ECHO ELIMINATOR

Also Published As

Publication number Publication date
FR2353864B1 (en) 1982-05-21

Similar Documents

Publication Publication Date Title
EP0535957A3 (en) Noise correction in radars for diffuse targets
GB1348078A (en) Adaptive moving target indicator clutter filter
GB1439713A (en) Corelation system for delay measurement
CA2027652A1 (en) FM-CW Radar Apparatus
GB1481414A (en) Radar apparatus
GB1479665A (en) Apparatus for reducing clutter in returns produced by a radar system
JPS5563774A (en) Detector for moving body
GB1409159A (en) Systems for processing the signal received by a sideways looking airborne radar system
US4042924A (en) MTI clutter tracking and cancelling system
GB1325629A (en) Signal processor
FR2353864A1 (en) Elimination of fixed and parasitic radar images - involves digital processing of echo phase comparison circuit outputs, and use of reference signal
GB1260446A (en) Improvements in or relating to radio direction finders
IT1061974B (en) Elimination of fixed and parasitic radar images - involves digital processing of echo phase comparison circuit outputs, and use of reference signal
FR2365132A1 (en) DEVELOPMENT OF SYSTEMS DESIGNED TO REDUCE ELEVATION ERROR IN RADARS TRACKING TARGETS AT LOW ALTITUDE
GB1536975A (en) Side-looking radar systems
JPS5455198A (en) Radar apparatus
ES8304319A1 (en) Radar signal processor
SU1122985A1 (en) Sea-way indication device
JPS6447985A (en) Cw radar system
SU640209A1 (en) Method of measuring ship speed relative to the bottom
JPS52150994A (en) 3-dimensional radar apparatus
JPS5554481A (en) Bistatic radar system
GB1192290A (en) An Echo Filtering Arrangement for Radar Systems
JPS57166574A (en) Receiver
GB1404794A (en) Doppler pulse radar receivers

Legal Events

Date Code Title Description
ST Notification of lapse