FR2355301A1 - SYSTEM FOR THE SUPPRESSION, BY A SELF-ADAPTATION TECHNIQUE, OF UNDESIRABLE ECHOES IN COHERENT PULSE RADARS - Google Patents

SYSTEM FOR THE SUPPRESSION, BY A SELF-ADAPTATION TECHNIQUE, OF UNDESIRABLE ECHOES IN COHERENT PULSE RADARS

Info

Publication number
FR2355301A1
FR2355301A1 FR7719045A FR7719045A FR2355301A1 FR 2355301 A1 FR2355301 A1 FR 2355301A1 FR 7719045 A FR7719045 A FR 7719045A FR 7719045 A FR7719045 A FR 7719045A FR 2355301 A1 FR2355301 A1 FR 2355301A1
Authority
FR
France
Prior art keywords
self
obstacles
suppression
adaptation technique
echoes
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.)
Withdrawn
Application number
FR7719045A
Other languages
French (fr)
Inventor
Paolo Lombardi
Gaspare Galati
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.)
Leonardo SpA
Original Assignee
Selenia Industrie Elettroniche Associate SpA
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 Selenia Industrie Elettroniche Associate SpA filed Critical Selenia Industrie Elettroniche Associate SpA
Publication of FR2355301A1 publication Critical patent/FR2355301A1/en
Withdrawn legal-status Critical Current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
    • G01S13/5244—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

La présente invention concerne un système dans lequel, au moyen d'une technique d'auto-adaptation, on peut effectuer l'effacement des échos indésirables provenant d'obstacles animés d'une certaine vitesse relative par rapport au radar. Le système est constitué par un effaceur du type conventionnel, ayant à une de ses entrées une référence constante égale à 1, et à l'autre entrée une référence variable de façon auto-adaptable c'est-à-dire de manière à annuler, à chaque instant, la réponse en fréquence de l'effaceur, pour une valeur de la fréquence de battement égale à la fréquence moyenne des échos indésirables. Le but fondamental est d'effectuer l'effacement des échos indésirables, soit à des obstacles fixes par rapport au radar, soit à des obstacles doués d'une vitesse relative non nulle.The present invention relates to a system in which, by means of a self-adaptation technique, it is possible to perform the erasure of unwanted echoes originating from animated obstacles of a certain relative speed with respect to the radar. The system consists of an eraser of the conventional type, having at one of its inputs a constant reference equal to 1, and at the other input a variable reference in a self-adapting manner, that is to say so as to cancel, at each instant, the frequency response of the eraser, for a value of the beat frequency equal to the mean frequency of the unwanted echoes. The fundamental aim is to erase unwanted echoes, either at obstacles fixed with respect to the radar, or at obstacles endowed with a non-zero relative speed.

FR7719045A 1976-06-15 1977-06-15 SYSTEM FOR THE SUPPRESSION, BY A SELF-ADAPTATION TECHNIQUE, OF UNDESIRABLE ECHOES IN COHERENT PULSE RADARS Withdrawn FR2355301A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT4995376A IT1066425B (en) 1976-06-15 1976-06-15 SYSTEM FOR THE SUPPRESSION WITH ADJUSTIVE TECHNIQUE OF UNDESIRABLE ECHES IN PULSE COHERENT RADARS

Publications (1)

Publication Number Publication Date
FR2355301A1 true FR2355301A1 (en) 1978-01-13

Family

ID=11271937

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7719045A Withdrawn FR2355301A1 (en) 1976-06-15 1977-06-15 SYSTEM FOR THE SUPPRESSION, BY A SELF-ADAPTATION TECHNIQUE, OF UNDESIRABLE ECHOES IN COHERENT PULSE RADARS

Country Status (5)

Country Link
DE (1) DE2726700C2 (en)
FR (1) FR2355301A1 (en)
GB (1) GB1586597A (en)
IT (1) IT1066425B (en)
NL (1) NL7706582A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2151426B (en) * 1983-12-09 1988-09-21 Plessey Co Plc Clutter filter
FR2632420B1 (en) * 1987-10-16 1990-10-12 Thomson Csf METHOD AND DEVICE FOR COMPENSATING THE SPEED OF CLOUD IN A COHERENT DOPPLER RADAR AT AMBIGUOUS VARIABLE SPEED

Also Published As

Publication number Publication date
DE2726700C2 (en) 1985-06-27
GB1586597A (en) 1981-03-25
DE2726700A1 (en) 1977-12-29
IT1066425B (en) 1985-03-12
NL7706582A (en) 1977-12-19

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Legal Events

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ST Notification of lapse