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GB2011749A - Fixed echo canceller for radar systems - Google Patents

Fixed echo canceller for radar systems

Info

Publication number
GB2011749A
GB2011749A GB7845813A GB7845813A GB2011749A GB 2011749 A GB2011749 A GB 2011749A GB 7845813 A GB7845813 A GB 7845813A GB 7845813 A GB7845813 A GB 7845813A GB 2011749 A GB2011749 A GB 2011749A
Authority
GB
United Kingdom
Prior art keywords
radar systems
echo canceller
fixed
channel
fixed echo
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
GB7845813A
Other versions
GB2011749B (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.)
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 GB2011749A publication Critical patent/GB2011749A/en
Application granted granted Critical
Publication of GB2011749B publication Critical patent/GB2011749B/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
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/28—Details of pulse systems
    • G01S7/285—Receivers
    • G01S7/292—Extracting wanted echo-signals
    • G01S7/2923—Extracting wanted echo-signals based on data belonging to a number of consecutive radar periods
    • G01S7/2927—Extracting wanted echo-signals based on data belonging to a number of consecutive radar periods by deriving and controlling a threshold value
    • 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
    • G01S13/5246—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 post processors for coherent MTI discriminators, e.g. residue cancellers, CFAR after Doppler 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
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/28—Details of pulse systems
    • G01S7/285—Receivers
    • G01S7/34—Gain of receiver varied automatically during pulse-recurrence period, e.g. anti-clutter gain control

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

The invention relates to a fixed echo canceller for radar systems comprising one normal channel and one controlling channel. The controlling channel includes at least a logarithmic amplifier (12) and a calculating circuit (13) which measures the mean amplitude of the clutter echo signals over a range and bearing cell and then over one or more antenna revolutions. This latter mean value for the amplitude of the video signals is used to control the gain of the linear amplifier (9) in the normal channel of the arrangement, which includes a demodulator 10 and a filtering circuit 11 which suppresses the fixed echoes. <IMAGE>
GB7845813A 1977-11-22 1978-11-22 Fixed echo canceller for radar systems Expired GB2011749B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7735043A FR2409521A1 (en) 1977-11-22 1977-11-22 FIXED ECHO ELIMINATION DEVICE, MORE PARTICULARLY ASSOCIATED WITH A RADAR SYSTEM AND RADAR SYSTEM INCLUDING IT

Publications (2)

Publication Number Publication Date
GB2011749A true GB2011749A (en) 1979-07-11
GB2011749B GB2011749B (en) 1982-06-16

Family

ID=9197892

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7845813A Expired GB2011749B (en) 1977-11-22 1978-11-22 Fixed echo canceller for radar systems

Country Status (4)

Country Link
DE (1) DE2850508C2 (en)
FR (1) FR2409521A1 (en)
GB (1) GB2011749B (en)
IT (1) IT1106337B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006122712A1 (en) * 2005-05-19 2006-11-23 Selex Sistemi Integrati Gmbh Method and device for the correction of weather data and computer program product

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2467412A1 (en) * 1979-10-10 1981-04-17 Thomson Csf Digital AGC circuit for radar target detector - has gain controlled from memorised signal from counter and digital integrator circuits
NL7908860A (en) * 1979-12-10 1981-07-01 Hollandse Signaalapparaten Bv THRESHOLD FOR RADAR VIDEO SIGNALS.
DE3127065A1 (en) * 1981-07-09 1983-01-27 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Method for suppressing noise echoes in radar installations and arrangement to carry out the method
DE3209399A1 (en) * 1982-03-16 1983-09-29 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Method and arrangement for improving the signal/noise ratio in radar systems
DE3213430A1 (en) * 1982-04-10 1983-10-20 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Method and arrangement for target recognition and noise signal suppression in radar sets
DE3933437A1 (en) * 1989-10-06 1991-04-18 Diehl Gmbh & Co Radar installation range and orientation determination - uses processors to determine range and orientation in conjunction with data reduction equipment to simplify final processing

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1245452B (en) * 1965-06-02 1967-07-27 Int Standard Electric Corp Radar system with display reduction of longer fixed target echoes
US3786506A (en) * 1972-03-10 1974-01-15 Hughes Aircraft Co Dynamic range control system
US4058809A (en) * 1972-06-26 1977-11-15 Control Data Corporation MTI system and method
NL174675C (en) * 1976-09-06 1984-07-16 Hollandse Signaalapparaten Bv DEVICE FOR GENERATING THE CONTROL VOLTAGE FOR THE AUTOMATIC STRENGTH CONTROL OF AN IMPULSE RADAR DEVICE.
FR2377640A1 (en) * 1977-01-18 1978-08-11 Thomson Csf DEVICE FOR STABILIZING THE RATE OF FALSE ALARMS IN A RADAR AND RADAR SYSTEM INCLUDING SUCH A DEVICE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006122712A1 (en) * 2005-05-19 2006-11-23 Selex Sistemi Integrati Gmbh Method and device for the correction of weather data and computer program product

Also Published As

Publication number Publication date
DE2850508C2 (en) 1985-01-03
IT1106337B (en) 1985-11-11
IT7851989A0 (en) 1978-11-21
FR2409521B1 (en) 1982-10-22
GB2011749B (en) 1982-06-16
DE2850508A1 (en) 1979-06-13
FR2409521A1 (en) 1979-06-15

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee