EP0097073A1 - Verfahren und Vorrichtung zur Verringerung des Störsignalpegels, empfangen über die Nebenzipfel einer Radarantenne - Google Patents

Verfahren und Vorrichtung zur Verringerung des Störsignalpegels, empfangen über die Nebenzipfel einer Radarantenne Download PDF

Info

Publication number
EP0097073A1
EP0097073A1 EP83401063A EP83401063A EP0097073A1 EP 0097073 A1 EP0097073 A1 EP 0097073A1 EP 83401063 A EP83401063 A EP 83401063A EP 83401063 A EP83401063 A EP 83401063A EP 0097073 A1 EP0097073 A1 EP 0097073A1
Authority
EP
European Patent Office
Prior art keywords
auxiliary
antenna
diagrams
diagram
main
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
EP83401063A
Other languages
English (en)
French (fr)
Other versions
EP0097073B1 (de
Inventor
Serge Drabowitch
Claude Aubry
Daniel Casseau
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 EP0097073A1 publication Critical patent/EP0097073A1/de
Application granted granted Critical
Publication of EP0097073B1 publication Critical patent/EP0097073B1/de
Expired legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
    • H01Q3/2605—Array of radiating elements provided with a feedback control over the element weights, e.g. adaptive arrays
    • H01Q3/2611—Means for null steering; Adaptive interference nulling
    • H01Q3/2629—Combination of a main antenna unit with an auxiliary antenna unit
    • H01Q3/2635—Combination of a main antenna unit with an auxiliary antenna unit the auxiliary unit being composed of a plurality of antennas

Definitions

  • the present invention relates to the protection of a radar system against jamming. It relates more particularly to a method and devices for reducing the power of the interference signals received by the side lobes of a radar antenna.
  • interference signals are generally active, natural or artificial, continuous or cut-off interference signals, sometimes transmitted by several independent jammers and which combine with the internal noise of the associated receivers.
  • these interference signals are received by the secondary lobes of the radar antenna with a level such that they considerably reduce the signal to noise ratio and completely disrupt the operation of the radar.
  • auxiliary antennas with their reception channels, whose diagrams are combined with that of the main antenna considered so as to obtain a global diagram having zeros, or at least minima, in the directions of external jammers while avoiding excessive amplification of the internal noises of the receivers associated with the auxiliary antennas.
  • FIG. 1 recalls the classic diagram of a multi-jammer OLS system, comprising a certain number of decoration loops.
  • a conventional OLS system is a "looped" system mainly comprising a main antenna 1 and auxiliary antennas 2,3 each associated with a reception channel 200, 300.
  • Each of these reception channels comprises a loop constituted by an amplifier 4, 40 , an integrator 5, 50, a correlator 6, 60 and a control mixer 7, 70.
  • each signal b, b 'received by an auxiliary antenna is cut off in a circuit 8 at signal b received by the main antenna, after each auxiliary signal (b, b ') has been multiplied by a weighting coefficient (W, W') subject to the correlation existing between the auxiliary signal and the signal used.
  • the signal processed takes the form b -bW-b'W. We show that the total noise is then minimum. The adaptation to the environment mentioned above is thus carried out.
  • Non-looped systems are also known, in which the optimal weighting coefficients W are determined by a calculation which amounts to inverting the covariance matrix of the signals received by the main antenna and the auxiliary signals.
  • auxiliary antennas are not indifferent to the speed of convergence of the process, the final improvement factor, the signal to interference ratio, the bandwidth of the system and the vulnerability of the system to additional interferers.
  • the object of the invention is both a method and a device for reducing the power of the interference signals received by the side lobes of a radar antenna which overcomes the drawbacks mentioned above.
  • the method of reducing the power of interference signals capable of being received by the side lobes of a radar antenna is characterized in that the auxiliary diagrams are directional, have a zero in the direction of the radiation maximum of the main diagram, have a phase center close to that of the main diagram and have a minimum gain in the areas where the level of the side lobes of the main diagram is sufficiently low to avoid picking up the jammers in these areas.
  • limiters in different correlation loops, increasing the speed of convergence of said loops.
  • the main and auxiliary antennas must present diagrams such that the set of antennas constitutes a sort of spatial filter of the environment of the antenna.
  • an antenna structure can be defined, the optimized auxiliary diagrams of which have the characteristics which have been given.
  • Such diagrams are so-called sampling diagrams, produced from a linear network.
  • FIG. 2a shows schematically a linear network 9 of length L, identified by an abscissa x and which is the seat of an illumination IL, defined by the scalar complex function f (x) bounded by the domain ( , ).
  • This network radiates, in a direction 0 identified with respect to the normal N to network 9, a diagram F ( ⁇ ) well represented, in FIG. 2b, by the trans Fourier formed of f (x), with: , ⁇ being the wavelength.
  • Each sampling diagram has the characteristics which are those required according to the invention for an auxiliary diagram.
  • each sampling diagram in number N
  • N the subject of a separate entry
  • Such a multibeam antenna is shown in FIG. 4a very schematically.
  • the supply channels all include a weighting device 11, assigning to the signal which passes through them a weighting coefficient (Wi) determined in known manner; these channels are connected to a summing device 8, also receiving the main channel and supplying a receiver 12 which delivers the signal cleared of the jammers, or at least a signal in which the effect of the interference is greatly attenuated.
  • a weighting device 11 assigning to the signal which passes through them a weighting coefficient (Wi) determined in known manner; these channels are connected to a summing device 8, also receiving the main channel and supplying a receiver 12 which delivers the signal cleared of the jammers, or at least a signal in which the effect of the interference is greatly attenuated.
  • FIG. 4b shows the diagrams of the various elementary antennas 1 to N which play the role of the sampling diagrams defined above.
  • FIG. 5 schematically represents a multibeam antenna whose elementary diagrams meet the characteristics which have been defined previously and which is advantageously used to reduce the power of the jammers picked up by the antenna.
  • the network antenna 9 is supplied by a power divider 13 through phase shifters 14, creating the main channel.
  • the auxiliary channels are created from couplers 15, placed in front of the phase shifters 14, which derive part of the incident energy towards a Buttler matrix 10 whose other terminals are connected to weighters 11 connected to an adder 8 receiving the channel main VP.
  • the adder is connected to a receiver 12.
  • a network antenna powered by a lens preferably aplanatic.
  • the primary sources 17 illuminating the lens 16 generate, in a domain surrounding the main channel 18, the auxiliary directional diagrams 19 sought.
  • the weighted addition, in phase and in amplitude, of the signals received by the auxiliary diagram 19, receiving a jammer B, with the signals received by the main diagram 18 makes it possible to obtain resulting signals in which the jammer is attenuated.
  • FIG. 7 represents such a primary source which allows better use of the antenna in the context of the invention.
  • the two antenna systems described above are particularly effective against multiple jammers located in directions not too far from that of the main lobe, distance which can be measured in a few widths at 3dB. If these jammers are distributed in a "horizontal" plane around the useful lobe, which is frequent in the case of distant powerful jammers, the sources are distributed as shown in figure 7.
  • array antenna can also be used, in accordance with the invention, to reduce the power of the jammers.
  • These are the network antennas supplied by a candlestick or espalier divider, that is to say a distributor circuit with successive divisions, produced with various technologies such as coaxial waveguides, triplates, printed circuits ...
  • the main channel consists of the main excitation input, or input of the sum channel "S" which produces a symmetrical, equiphase illumination, attenuated on the bell-shaped edges.
  • the main channel as a result of imperfect control, along the network, of the phase and of the amplitude in the frequency band to be covered, is accompanied by diffuse side lobes capable of collecting parasitic signals due to outdoor jammers.
  • the elementary couplers normally existing in the candlestick divider are replaced by directional couplers or of the magic tee type or of the hybrid ring type. All the elementary couplers are not systematically replaced but a certain number of them.
  • FIG. 8 represents, in a very schematic form, the linear network 9 of length L supplied by a candlestick so that one can distinguish there four sub-networks 20, 21, 22, 23 distributed symmetrically and supplied with the same power and equiphase by couplers 25, 26, 27 and 28, for example magic T's. You can then define a certain number of diagrams.
  • the central coupler 25 determines a sum channel S giving the main diagram and a difference channel D giving a difference diagram to constitute an auxiliary diagram within the meaning of the invention.
  • the couplers 26 and 27 each have a difference channel which are associated by lines of the same length with a coupler 28, magic tee or hybrid ring, which, developing the sum and the difference of the signals it receives, defines two other auxiliary diagrams , corresponding to what has been called, in an earlier publication of the applicant, the gap path (E) and the double difference path (D '). If we represent by a, b, c, and d respectively the amplitudes of the signals created by the networks 20-23, the deviation path E is characterized by a diagram ((ab) + (cd)) and the double difference path From by ((ab) - (cd)).
  • FIG. 9 represents the illumination laws of the different channels which have been defined from the array antenna of FIG. 8.
  • FIG. 14 schematically represents the device thus produced.
  • the network antenna 9 determines the main channel VP and the auxiliary channels 200, 300, 400 ... which are all connected to the summing circuit 8.
  • a limiter 29 In the correlation loop shown in FIG. 14 is inserted a limiter 29 before the correlator 6, through which the signal b 1 from the auxiliary antenna passes. This is achieved for each correlation loop.

Landscapes

  • Radar Systems Or Details Thereof (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP83401063A 1982-05-27 1983-05-26 Verfahren und Vorrichtung zur Verringerung des Störsignalpegels, empfangen über die Nebenzipfel einer Radarantenne Expired EP0097073B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8209257 1982-05-27
FR8209257A FR2527785A1 (fr) 1982-05-27 1982-05-27 Procede et dispositif de reduction de la puissance des signaux de brouillage recus par les lobes lateraux d'une antenne radar

Publications (2)

Publication Number Publication Date
EP0097073A1 true EP0097073A1 (de) 1983-12-28
EP0097073B1 EP0097073B1 (de) 1989-01-04

Family

ID=9274399

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83401063A Expired EP0097073B1 (de) 1982-05-27 1983-05-26 Verfahren und Vorrichtung zur Verringerung des Störsignalpegels, empfangen über die Nebenzipfel einer Radarantenne

Country Status (5)

Country Link
US (1) US4672378A (de)
EP (1) EP0097073B1 (de)
CA (1) CA1219324A (de)
DE (1) DE3378873D1 (de)
FR (1) FR2527785A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2560445A1 (fr) * 1984-02-24 1985-08-30 Thomson Csf Procede d'antibrouillage pour antenne reseau et antenne utilisant ledit procede
GB2251728A (en) * 1984-07-27 1992-07-15 Gen Electric Co Plc Receiving or transmitting apparatus
RU2453952C1 (ru) * 2011-02-14 2012-06-20 Пётр Николаевич Башлы Способ энергетической оптимизации моноимпульсных антенных решеток с совместным формированием лучей

Families Citing this family (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2632419B1 (fr) * 1983-11-08 1990-10-19 Thomson Csf Procede et dispositif d'antibrouillage pour radar et radar equipe d'un tel dispositif
GB2245102A (en) * 1990-06-16 1991-12-18 British Aerospace A frequency reuse phased array antenna system
US5343211A (en) * 1991-01-22 1994-08-30 General Electric Co. Phased array antenna with wide null
US6653969B1 (en) * 1993-02-19 2003-11-25 Raytheon Company Dispersive jammer cancellation
FR2715511B1 (fr) * 1994-01-21 1996-02-23 Thomson Csf Dispositif de compensation des erreurs de pointage causées par des pannes de déphaseurs d'antennes à balayage électronique ou de coefficients d'antennes à formation de faisceaux par le calcul.
GB2517661B (en) * 1995-10-24 2016-03-30 Thomson Csf An anti-jamming antenna
FR2775347B1 (fr) * 1998-02-24 2000-05-12 Thomson Csf Procede de determination de l'erreur de calage de la face rayonnante d'une antenne reseau a balayage electronique
EP0942294A3 (de) * 1998-03-09 2000-06-07 Siemens Schweiz AG (Siemens Suisse SA) (Siemens Svizzera SA) Siemens Switzerland Ltd) Verfahren zur Seitenkeulenunterdrückung und Amplituden- oder Phasen-Monopulsradargerät
JP2000244224A (ja) * 1999-02-22 2000-09-08 Denso Corp マルチビームアンテナ及びアンテナシステム
US6404379B1 (en) * 2000-06-29 2002-06-11 Lockheed Martin Corporation Matrix monopulse ratio radar processor for two target azimuth and elevation angle determination
US6369746B1 (en) * 2000-07-13 2002-04-09 Raytheon Company Simultaneous nulling in low sidelobe sum and difference antenna beam patterns
FR2812457B1 (fr) 2000-07-28 2004-05-28 Thomson Csf Reflecteur hyperfrequence actif a bi-polarisation, notamment pour antenne a balalyage electronique
US6697009B2 (en) * 2001-06-15 2004-02-24 Lockheed Martin Corporation Adaptive digital beamforming architecture for target detection and angle estimation in multiple mainlobe and sidelobe jamming
US6661366B2 (en) * 2001-06-15 2003-12-09 Lockheed Martin Corporation Adaptive digital sub-array beamforming and deterministic sum and difference beamforming, with jamming cancellation and monopulse ratio preservation
DE10140498C1 (de) * 2001-08-17 2003-05-15 Eads Deutschland Gmbh Verfahren zur Unterdrückung von Jammer-Signalen
EG23432A (de) 2001-12-17 2005-07-25 New Zealand Dairy Board
US7280627B2 (en) * 2002-12-09 2007-10-09 The Johns Hopkins University Constrained data-adaptive signal rejector
US6844850B1 (en) * 2004-05-20 2005-01-18 Benq Corporation Anti-jammer pre-processor
US20080068266A1 (en) * 2005-11-23 2008-03-20 Northrop Grumman Corporation Beamforming for spatial sidelobe cancellation and AMR direction finding
CN101542840B (zh) * 2007-04-10 2013-11-20 日本电气株式会社 多波束天线
DE102007055534B4 (de) 2007-11-21 2018-08-09 Imst Gmbh Kompakte Richtantennenanordnung mit Mehrfachnutzung von Strahlerelementen
US9450310B2 (en) 2010-10-15 2016-09-20 The Invention Science Fund I Llc Surface scattering antennas
US9160072B2 (en) * 2012-11-14 2015-10-13 Raytheon Company Antenna system having guard array and associated techniques
US9385435B2 (en) 2013-03-15 2016-07-05 The Invention Science Fund I, Llc Surface scattering antenna improvements
US9219508B1 (en) 2013-08-06 2015-12-22 The Boeing Company Interference mitigation for a communications system
US9490893B2 (en) 2013-09-26 2016-11-08 The Boeing Company Interference suppression in a satellite communication system using onboard beamforming and ground-based processing
US9923271B2 (en) 2013-10-21 2018-03-20 Elwha Llc Antenna system having at least two apertures facilitating reduction of interfering signals
US9647345B2 (en) 2013-10-21 2017-05-09 Elwha Llc Antenna system facilitating reduction of interfering signals
US9935375B2 (en) 2013-12-10 2018-04-03 Elwha Llc Surface scattering reflector antenna
US9871291B2 (en) 2013-12-17 2018-01-16 Elwha Llc System wirelessly transferring power to a target device over a tested transmission pathway
US9843103B2 (en) 2014-03-26 2017-12-12 Elwha Llc Methods and apparatus for controlling a surface scattering antenna array
US9448305B2 (en) 2014-03-26 2016-09-20 Elwha Llc Surface scattering antenna array
US10446903B2 (en) 2014-05-02 2019-10-15 The Invention Science Fund I, Llc Curved surface scattering antennas
US9882288B2 (en) 2014-05-02 2018-01-30 The Invention Science Fund I Llc Slotted surface scattering antennas
US9711852B2 (en) 2014-06-20 2017-07-18 The Invention Science Fund I Llc Modulation patterns for surface scattering antennas
US9853361B2 (en) 2014-05-02 2017-12-26 The Invention Science Fund I Llc Surface scattering antennas with lumped elements
US10361481B2 (en) 2016-10-31 2019-07-23 The Invention Science Fund I, Llc Surface scattering antennas with frequency shifting for mutual coupling mitigation
US10833402B2 (en) 2018-02-16 2020-11-10 Notch, Inc. Software defined antenna using controllable metamaterials
US11394111B1 (en) 2019-08-14 2022-07-19 Notch, Inc. Electronically reconfigurable antenna
KR102336597B1 (ko) * 2020-09-03 2021-12-07 엘아이지넥스원 주식회사 재밍 신호 회피를 위한 부엽제거 기능 최적화 장치 및 방법

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2825900A (en) * 1950-02-17 1958-03-04 Rand Corp Directional receiver
US3290684A (en) * 1960-10-03 1966-12-06 Trw Inc Directional receiving systems
FR2246880A1 (de) * 1969-11-27 1975-05-02 Emi Ltd
DE2642144A1 (de) * 1976-09-20 1978-03-23 Siemens Ag Adaptives antennensystem
US4177464A (en) * 1978-11-13 1979-12-04 The United States Of America As Represented By The Secretary Of The Air Force Multiplexing of multiple loop sidelobe cancellers
US4246585A (en) * 1979-09-07 1981-01-20 The United States Of America As Represented By The Secretary Of The Air Force Subarray pattern control and null steering for subarray antenna systems

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3245081A (en) * 1963-02-08 1966-04-05 Hughes Aircraft Co Multiple feed wide angle antenna utilizing biconcave spherical delay lens
US3438044A (en) * 1967-06-13 1969-04-08 Nasa Monopulse system with an electronic scanner
US3803613A (en) * 1971-10-26 1974-04-09 Us Navy Phase antenna array providing continuous all-angle reception by harmonic frequency modulation of incoming signals
US4146889A (en) * 1972-01-20 1979-03-27 Technology Service Corporation Method and apparatus for sidelobe reduction in radar
US3731316A (en) * 1972-04-25 1973-05-01 Us Navy Butler submatrix feed for a linear array
US3981014A (en) * 1974-08-12 1976-09-14 Hazeltine Corporation Interference rejection system for multi-beam antenna
US4070675A (en) * 1976-10-21 1978-01-24 Motorola Inc. Power rejection apparatus using a null-constrained subarray for MTI radar applications
US4097866A (en) * 1977-02-10 1978-06-27 The United States Of America As Represented By The Secretary Of The Air Force Multilevel sidelobe canceller
US4117494A (en) * 1977-03-31 1978-09-26 Hazeltine Corporation Antenna coupling network with element pattern shift
NL7712216A (nl) * 1977-11-07 1979-05-09 Hollandse Signaalapparaten Bv Monopulsradarapparaat.
JPS5744302A (en) * 1980-08-28 1982-03-12 Mitsubishi Electric Corp Antenna device
US4370655A (en) * 1980-12-31 1983-01-25 The United States Of America As Represented By The Secretary Of The Army Combined side lobe canceller and frequency selective limiter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2825900A (en) * 1950-02-17 1958-03-04 Rand Corp Directional receiver
US3290684A (en) * 1960-10-03 1966-12-06 Trw Inc Directional receiving systems
FR2246880A1 (de) * 1969-11-27 1975-05-02 Emi Ltd
DE2642144A1 (de) * 1976-09-20 1978-03-23 Siemens Ag Adaptives antennensystem
US4177464A (en) * 1978-11-13 1979-12-04 The United States Of America As Represented By The Secretary Of The Air Force Multiplexing of multiple loop sidelobe cancellers
US4246585A (en) * 1979-09-07 1981-01-20 The United States Of America As Represented By The Secretary Of The Air Force Subarray pattern control and null steering for subarray antenna systems

Non-Patent Citations (7)

* Cited by examiner, † Cited by third party
Title
ELECTRONICS LETTERS, vol. 13, no. 22, octobre 1977, pages 669-670, Hitchin Herts, G.B. *
IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS, vol. 16, no. 6, novembre 1980, pages 839-850, New York, USA *
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, vol. AP-24, no. 5, septembre 1976, pages 575-584, New York, USA *
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, vol. AP-24, no. 5, septembre 1976, pages 585-598, New York, USA *
MICROWAVE JOURNAL, mars 1978, pages 59-63, Dedham, USA *
PATENTS ABSTRACTS OF JAPAN, vol. 6, no. 136(E-120)(1014), 23 juillet 1982 & JP - A - 57 61304 (TOKYO SHIBAURA DENKI K.K.) 13-04-1982 *
PROCEEDINGS OF THE 11th EUROPEAN MICROWAVE CONFERENCE, 7-11 septembre 1981, pages 805-812, Sevenoaks, G.B. *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2560445A1 (fr) * 1984-02-24 1985-08-30 Thomson Csf Procede d'antibrouillage pour antenne reseau et antenne utilisant ledit procede
EP0156685A1 (de) * 1984-02-24 1985-10-02 Thomson-Csf Verfahren gegen Störungen für eine Antennengruppe und mit einem solchen Verfahren arbeitende Antenne
GB2251728A (en) * 1984-07-27 1992-07-15 Gen Electric Co Plc Receiving or transmitting apparatus
GB2251728B (en) * 1984-07-27 1992-09-23 Gen Electric Co Plc Receiving or transmitting apparatus
RU2453952C1 (ru) * 2011-02-14 2012-06-20 Пётр Николаевич Башлы Способ энергетической оптимизации моноимпульсных антенных решеток с совместным формированием лучей

Also Published As

Publication number Publication date
CA1219324A (en) 1987-03-17
FR2527785B1 (de) 1985-01-18
US4672378A (en) 1987-06-09
FR2527785A1 (fr) 1983-12-02
DE3378873D1 (en) 1989-02-09
EP0097073B1 (de) 1989-01-04

Similar Documents

Publication Publication Date Title
EP0097073B1 (de) Verfahren und Vorrichtung zur Verringerung des Störsignalpegels, empfangen über die Nebenzipfel einer Radarantenne
EP0891005B1 (de) Gruppenantenne mit Störungschutz
EP0014650A1 (de) Adaptives Höchstfrequenz-Raumfilter und dessen Verfahren der Anwendung zur Abschwächung oder Unterdrückung der Nebenzipfel des Strahlungsdiagrammes einer Antenne
EP3577720B1 (de) Elementare antenne mit einer planaren strahlungsvorrichtung
WO2018141882A1 (fr) Antenne elementaire a dispositif rayonnant planaire
EP2363729B1 (de) Erzeuger von rekonfigurierbaren Kanälen für Netzantenne
FR2811142A1 (fr) Dispositif d'emission et/ou de reception d'ondes electromagnetiques alimente par un reseau realise en technologie microruban
CA2351119A1 (fr) Antenne de telecommunication destinee a couvrir une large zone terrestre
EP1490987A2 (de) Entstörverfahren für empfänger von spreizspektrum-funksignalen
EP1533866B1 (de) Adaptive Phasengesteuerte Gruppenantenne mit digitaler Keulenformung
EP1351333A2 (de) Adaptive Gruppenantenne und Radar mit einer solchen Antenne
CA3003495C (fr) Procede et dispositif de suppression de signal parasite dans un signal de charge utile d'un satellite
FR2741478A1 (fr) Antenne a formation de faisceaux par calcul segmentee en sous-reseaux
EP1385019A1 (de) Entstörungsvorrichtung, insbesondere für Radargeräte mit aktiven Gruppenantennen
EP4000131B1 (de) Gruppenantenne mit mehreren paneelen
EP0664574B1 (de) Einrichtung zur Kompensation des Richtungsfehlers bei einer Antenne mit elektronischer Ablenkung
FR2943466A1 (fr) Element rayonnant a bipolarisation
EP1233282B1 (de) Vorrichtung mit verteilten Sende- und Empfangsantennen, insbesondere für Radar mit synthetischer Emission und Strahlbildung
FR2828583A1 (fr) Procede de fermeture d'une antenne a balayage electronique, procede de reglage et dephaseur d'une telle antenne
BE1012190A4 (fr) Procede de brouillage perfectionne.
EP0172094A1 (de) Betriebssystem für mehrere benachbarte Radargeräte
FR3123161A1 (fr) Antenne réseau planaire
EP2145361B1 (de) Antennensystem für einen mobilträger
FR2687014A1 (fr) Antenne de telecommunication protegee contre le brouillage et son procede de mis en óoeuvre.
FR2736778A1 (fr) Procede et systeme pour l'attenuation de l'effet de brouilleurs sur une antenne de reception de signaux radioelectriques

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE GB IT NL

17P Request for examination filed

Effective date: 19840609

17Q First examination report despatched

Effective date: 19860303

D17Q First examination report despatched (deleted)
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE GB IT NL

ITF It: translation for a ep patent filed

Owner name: JACOBACCI & PERANI S.P.A.

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
REF Corresponds to:

Ref document number: 3378873

Country of ref document: DE

Date of ref document: 19890209

RAP4 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: THOMSON-CSF

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19900531

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19911201

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
ITTA It: last paid annual fee
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20020419

Year of fee payment: 20

Ref country code: DE

Payment date: 20020419

Year of fee payment: 20

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20030525

REG Reference to a national code

Ref country code: GB

Ref legal event code: PE20