EP0467738A1 - Vorrichtung zur Messung des Azimuthwinkels für ein mit einer Doppelkrümmungsreflektorantenne ausgerüstetes Radar - Google Patents

Vorrichtung zur Messung des Azimuthwinkels für ein mit einer Doppelkrümmungsreflektorantenne ausgerüstetes Radar Download PDF

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Publication number
EP0467738A1
EP0467738A1 EP91401819A EP91401819A EP0467738A1 EP 0467738 A1 EP0467738 A1 EP 0467738A1 EP 91401819 A EP91401819 A EP 91401819A EP 91401819 A EP91401819 A EP 91401819A EP 0467738 A1 EP0467738 A1 EP 0467738A1
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EP
European Patent Office
Prior art keywords
source
auxiliary
site
curve
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.)
Withdrawn
Application number
EP91401819A
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English (en)
French (fr)
Inventor
Claude Aubry
Daniel Casseau
Joseph Roger
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 EP0467738A1 publication Critical patent/EP0467738A1/de
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/29—Combinations of different interacting antenna units for giving a desired directional characteristic
    • H01Q21/293—Combinations of different interacting antenna units for giving a desired directional characteristic one unit or more being an array of identical aerial elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
    • H01Q25/007—Antennas or antenna systems providing at least two radiating patterns using two or more primary active elements in the focal region of a focusing device

Definitions

  • the present invention relates to a device for measuring the angle of elevation for a radar equipped with a reflector antenna of the double curvature type.
  • the radar antennas with reflector of the “double curvature” type allow a fairly precise measurement of the bearing angle of a target, but because their coverage diagram in elevation is very wide (generally with cosecant, covering between 5 and 45 ° on site approximately), they do not make it possible to make site angle measurements.
  • the present invention relates to a device for measuring angles of target sites using a reflector antenna of the aforementioned type, which is simple and inexpensive.
  • the measuring device is applied to a radar with a reflector antenna of the double curvature type connected to a main measurement channel and is characterized by the fact that the main primary source is placed in the antenna.
  • an auxiliary source comprising at least two elementary sources connected to a distributor, even connected to an auxiliary measurement channel, the two channels being connected to a divider.
  • the auxiliary source has, in the site plane, a radiation diagram having substantially the same shape as that of the main source in the same plane, relative to a vertical line passing substantially through the middle of the range of site angles in which we want to make measurements.
  • the measuring device of the present invention uses a radar with a reflective antenna.
  • This antenna is of the well known type “double curvature” (called “double curvature reflective antenna” in English).
  • double curvature reflective antenna in English.
  • central curve This curve is located in the vertical plane of symmetry XOZ of the antenna. In Figure 1, this plan is that of the drawing. For clarity of the drawing, only the central curve 1 has been shown in FIG. 1.
  • a primary source 2 which can be, for example, of the horn or candle type, illuminates, on emission, the reflector based on the central curve 1.
  • the phase center 0 of the source 2 is located at the focus of the XOZ plane.
  • the shape of the central curve 1 allows, taking into account the appearance of the primary diagram of the source 2, to obtain the coverage diagram in desired site, for example with cosecant appearance.
  • the measurement of the azimuth angle of the targets identified by the antenna is carried out in the usual way with a generally sufficient precision because the generating parabolas of the reflector, which are not modified, have a good directivity in azimuth.
  • an auxiliary primary source 3 is added to the primary source 2, which will be referred to hereinafter as the main source.
  • the source 3 comprises three elementary sources 4, 5 and 6, but it is understood that the number of these elementary sources may be different, and may vary between 2 and 5 approximately.
  • This source 3 is placed under the source 2, in the XOZ plane of symmetry.
  • the three elementary sources 4 to 6 are identical to source 2, in order to reduce the cost of the assembly.
  • the maximum number of elementary sources constituting the source 3 is, in particular, determined by the space available under the source 2, and this, so that the elementary sources can "see" the reflector of the source 2.
  • the elementary sources 4 to 6 are supplied by an amplitude and / or phase distributor 7 connected to the auxiliary measurement channel 8.
  • This auxiliary channel 8 is similar to the main measurement channel 9 supplying the source 2.
  • These radar measurement channels being each well known per se, will not be described in detail.
  • These two channels are connected to a divider 9A at the output of which the desired value of elevation angle is collected. We will describe here, with reference to FIGS. 3 and 4, only the radiation diagrams which the sources 2 and 3 must produce, and how the signals from these sources are combined.
  • the curve 10 drawn in solid lines is that of the radiation diagram of the source 2.
  • an example of curve 11 has to be drawn in full line. by the source 3.
  • This curve 11 is substantially linear and allows measurements of site angles to be made with good precision and over a wide range of values of site angles.
  • This curve 11, if it is not really linear, must at least be monotonous (without extremum), and it preferably has a steep slope (variation of at least about 20 dB for a variation in elevation angle between 5 and 45 ° approximately).
  • the radiation diagram of the main source 2 (curve 10) is combined with a diagram that the source 3 can produce in order to obtain a monotonic curve in the angular range of sites desired, this monotonic curve having a sufficient slope to obtain the desired measurement accuracy (of the order of 1 °).
  • FIG. 4 shows the way to obtain curve 12 using the composition of the diagrams of several elementary sources.
  • three elementary sources are used (4 to 6).
  • each elementary source has little effect on diagram 12.
  • the shape of this diagram essentially depends on the shape of the central curve 1 (previously defined according to the site coverage diagram specified for the radar ), and the position of the phase center of each elementary source in the XOZ plane.
  • the procedure is preferably as follows. First we choose the number N of elementary sources constituting it. This number depends on the angular area on the site envisaged, and, as explained above, it is limited by the space available. Geometry of each elementary source, having little effect on the diagram of the auxiliary source, is frozen, and is preferably the same as that of the main source. For each of the elementary sources, four parameters can be varied: two for its position in the XOZ plane (xi, zi), and two relating to its electrical supply (phase and amplitude relative to those of the main source) so as to obtain the desired curve 12, and more generally speaking, to obtain a monotonous characteristic 11.
  • the set of 4N parameters (4 parameters for each of the N elementary sources) is determined. ) allowing to get as close as possible, in the least squares sense, to the desired diagram 12.

Landscapes

  • Radar Systems Or Details Thereof (AREA)
EP91401819A 1990-07-20 1991-07-02 Vorrichtung zur Messung des Azimuthwinkels für ein mit einer Doppelkrümmungsreflektorantenne ausgerüstetes Radar Withdrawn EP0467738A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9009305A FR2664985B1 (fr) 1990-07-20 1990-07-20 Dispositif de mesure de l'angle de site pour un radar equipe d'une antenne a reflecteur du type a double courbure.
FR9009305 1992-07-28

Publications (1)

Publication Number Publication Date
EP0467738A1 true EP0467738A1 (de) 1992-01-22

Family

ID=9398950

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91401819A Withdrawn EP0467738A1 (de) 1990-07-20 1991-07-02 Vorrichtung zur Messung des Azimuthwinkels für ein mit einer Doppelkrümmungsreflektorantenne ausgerüstetes Radar

Country Status (5)

Country Link
US (1) US5138324A (de)
EP (1) EP0467738A1 (de)
JP (1) JPH04232885A (de)
CA (1) CA2047032A1 (de)
FR (1) FR2664985B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0920076A2 (de) * 1997-10-30 1999-06-02 Space Systems/Loral, Inc. Vielfach-Strahlungskeulen durch geformte Reflektorantenne
CN109459736A (zh) * 2019-01-04 2019-03-12 北京环境特性研究所 一种雷达靶标设计方法和装置

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2697949B1 (fr) * 1992-11-06 1995-01-06 Thomson Csf Antenne pour radar notamment de désignation et de trajectographie.
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.
FR2725075B1 (fr) * 1994-09-23 1996-11-15 Thomson Csf Procede et dispositif d'elargissement du diagramme de rayonnement d'une antenne active
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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1501344A (fr) * 1965-12-01 1967-11-10 Raytheon Co Dispositif de réception pour radar
FR2085873A1 (de) * 1970-04-06 1971-12-31 Siemens Ag
US4156243A (en) * 1977-10-14 1979-05-22 Rca Corporation Paraboloid reflector antenna

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3234559A (en) * 1960-05-07 1966-02-08 Telefunken Patent Multiple horn feed for parabolic reflector with phase and power adjustments
US3495249A (en) * 1968-11-12 1970-02-10 Us Air Force Radar height readout system
DE2945789A1 (de) * 1979-11-13 1981-05-21 Siemens AG, 1000 Berlin und 8000 München Antennenanordnung fuer ein radarrundsuchverfahren zur zielortung mit hoehenerfassung
US4628321A (en) * 1982-04-14 1986-12-09 Harris Corporation Aperture transformation sidelobe canceller

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1501344A (fr) * 1965-12-01 1967-11-10 Raytheon Co Dispositif de réception pour radar
FR2085873A1 (de) * 1970-04-06 1971-12-31 Siemens Ag
US4156243A (en) * 1977-10-14 1979-05-22 Rca Corporation Paraboloid reflector antenna

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
M.I. SKOLNIK 'INTRODUCTION TO RADAR SYSTEMS' 1986 , MCGRAW-HILL , SINGAPORE *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0920076A2 (de) * 1997-10-30 1999-06-02 Space Systems/Loral, Inc. Vielfach-Strahlungskeulen durch geformte Reflektorantenne
EP0920076A3 (de) * 1997-10-30 2000-08-23 Space Systems/Loral, Inc. Vielfach-Strahlungskeulen durch geformte Reflektorantenne
CN109459736A (zh) * 2019-01-04 2019-03-12 北京环境特性研究所 一种雷达靶标设计方法和装置
CN109459736B (zh) * 2019-01-04 2020-10-13 北京环境特性研究所 一种雷达靶标设计方法和装置

Also Published As

Publication number Publication date
FR2664985B1 (fr) 1992-11-27
US5138324A (en) 1992-08-11
JPH04232885A (ja) 1992-08-21
CA2047032A1 (fr) 1992-01-21
FR2664985A1 (fr) 1992-01-24

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