EP0455543B1 - Vorrichtung zur Ausrichtung einer Reflektorantenne - Google Patents

Vorrichtung zur Ausrichtung einer Reflektorantenne Download PDF

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Publication number
EP0455543B1
EP0455543B1 EP19910401103 EP91401103A EP0455543B1 EP 0455543 B1 EP0455543 B1 EP 0455543B1 EP 19910401103 EP19910401103 EP 19910401103 EP 91401103 A EP91401103 A EP 91401103A EP 0455543 B1 EP0455543 B1 EP 0455543B1
Authority
EP
European Patent Office
Prior art keywords
axis
reflector
support
lever
focus
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.)
Expired - Lifetime
Application number
EP19910401103
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English (en)
French (fr)
Other versions
EP0455543A1 (de
Inventor
Gérard Muller
Michel Souliac
Bertrand Bruneau
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.)
MATRA ESPACE
Original Assignee
MATRA ESPACE
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Filing date
Publication date
Application filed by MATRA ESPACE filed Critical MATRA ESPACE
Publication of EP0455543A1 publication Critical patent/EP0455543A1/de
Application granted granted Critical
Publication of EP0455543B1 publication Critical patent/EP0455543B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/125—Means for positioning
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/28—Adaptation for use in or on aircraft, missiles, satellites, or balloons
    • H01Q1/288—Satellite antennas

Definitions

  • the subject of the invention is a device for pointing the reflector, generally parabolic, of an antenna, making it possible to modify the orientation of the reflector by giving it a movement which can be regarded as resulting from the composition of two rotational movements around axes orthogonal to each other, orthogonal to the main axis of the reflector and passing through the focus of the reflector.
  • paraboid reflector should be taken in a broad sense and as covering not only reflectors having a shape strictly in the form of a paraboid, but those deviating little from this shape, and as covering as well reflectors having a symmetry of revolution than those formed by an eccentric dish of paraboloid.
  • the invention finds particularly important applications in the pointing of satellite antennas, where it is often necessary to supplement a rough pointing carried out by controlling the attitude of the satellite with a fine pointing, in a field corresponding to a cone whose angle at the top hardly exceeds ten degrees, (see for example GB-A-2,127,624).
  • the pointing of an antenna by rotation of its reflector around the hearth seems a priori easy to achieve by means of very diverse nature.
  • the present invention aims in particular to eliminate these defects.
  • the invention proposes in particular a device for pointing the antenna reflector by rotation relative to a support, comprising: an arm fixed to the reflector and carried by the support by means of a seal allowing it to rotate around two orthogonal axes passing through the focal point of the reflector and perpendicular to an axis of the reflector; and arm drive means having a first rotary motor of axis directed towards the focus, carried by the support and driving a first lever and a second rotary motor of axis directed towards the focus, carried by the first lever and driving a second lever connected to the arm by a link rotating on the second lever around an axis directed towards the hearth.
  • the composition of the two rotational movements around axes contributing to the focus results in a change of orientation around the focus.
  • the seal is advantageously provided so as to have only rolling links, with the exclusion of sliding links, when the conditions of use restrict the possibilities of lubrication, which is the case on a satellite.
  • the seal may in particular be constituted by a gimbal, the intermediate frame of which is hollowed out so as to leave the necessary space for the source or the receiver arranged at the focus of the reflector and fixed relative to the support.
  • the articulation bearing of the link on the second lever must tolerate slight angular deflections of the axis of rotation: in practice, the slight play that a bearing presents will often be sufficient. Otherwise, flexible blade mounting can be used.
  • the radii of the circles traversed by the axis of the second motor around the axis of the first and by the axis of the bearing around the axis of the second motor are generally chosen so that the angles at the top of the corresponding cones are each equal to half the angle at the top of the aiming cone, centered on the axis of the first engine.
  • the two levers will then have substantially the same length and will be approximately the same distance from the focal point, which makes it possible to give the antenna all the possible pointing within a cone. However, when it is possible to admit a prohibited zone in the center of the cone, it is possible to give the arms slightly different lengths.
  • the device according to the invention has many advantages.
  • the reduction is very important, the angle of which the reflector rotates being much less (often of an order of magnitude) than the angle of which one or the other of the two motors rotates.
  • the motors themselves can be made up of irreversible electric motors because they are fitted with a high ratio reducer often exceeding 100, which increases rigidity and prevents drifts.
  • the motors can be placed in the immediate vicinity of the support, which is advantageous when mounted in space since the thermal operating conditions are improved.
  • the device shown in FIG. 1 is intended to orient a reflector 10, in the form of a cap of an eccentric paraboloid of main axis 11, relative to a support 12 formed by the body of a satellite, by rotation around the focal point F , where is a source (not shown) such as a cornet.
  • the device comprises an arm 13, rigid during the implementation of the device, but which can be made up of two parts connected by a lockable articulation 14, in order to allow the folding of the arm and the application of the reflector 10 against the support 12 when launching the satellite.
  • the arm 13 is carried by the support 12 by means of a seal allowing it to take any orientation in a cone centered on the focal point F and whose apex angle 2 ⁇ corresponds to the required pointing range. In practice, the half angle at the top will hardly exceed 10 degrees. An angle of 12 degrees has been planned for a currently planned telecommunications satellite.
  • the end of the arm 13 opposite the joint 15 is fixed to the reflector 10.
  • the drive means of the arm 13 are interposed between the support 12 and an intermediate point of the arm.
  • the location of these means and their constitution are such that they do not obscure the antenna lobe.
  • they are carried by a console 18 fixed to the support and they drive a rod 20 fixed to the arm rigidly, between the hearth F and the end fixed to the reflector.
  • a first rotary motor 22, the axis of which is directed towards the focal point, can be provided to coincide with the main axis of the paraboloid when the reflector is in its middle position, and comprises a stator fixed to the console 18 and a bearing rotor a first lever 24.
  • This first lever 24 carries the stator of a second electric motor 26 of axis also directed towards the hearth F and whose rotor carries a second lever 28.
  • the latter is connected to the rod 20 by means 30 allowing a 360 ° rotation around an axis directed towards the hearth F and slight tilting movements.
  • the means 30 may consist of a bearing each time lubrication is excluded. Many bearings indeed tolerate a slight tilting. However, it is also possible to mount the bearing on the link by means of elastically deformable means, such as crossed blades.
  • the levers 24 and 28 have lengths such that the angles at the top of the cones traversed by the axis of the motor 28 and the axis of the means 30 when the motors and the motors are rotated. vertex angles equal to ⁇ .
  • the axis of the paraboloid can be given any orientation in a cone with an angle at the top 2 ⁇ . However, this condition is no longer necessary when a central dead zone can be admitted.
  • the motors 22 and 26 will generally be constituted by electric motors with reducers having a very large reduction ratio, exceeding 100/1, so as to increase the precision and the irreversibility.
  • the motors 22 and 26 can be controlled by a control circuit having a conventional general constitution, this circuit can include a calculating member supplying, from input data which can be constituted by the angles ⁇ and ⁇ (FIG. 3 ), or coordinates in x and y, the orientation, from a determined origin, to be given to motors 22 and 26.
  • this circuit can include a calculating member supplying, from input data which can be constituted by the angles ⁇ and ⁇ (FIG. 3 ), or coordinates in x and y, the orientation, from a determined origin, to be given to motors 22 and 26.
  • this singular point is located in the middle position, that is to say when the means 30 are located on the axis of the first motor, the levers 24 and 28 being then folded over one another.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Remote Sensing (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Aerials With Secondary Devices (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Claims (6)

  1. Vorrichtung zur Ausrichtung eines Antennenreflektors (10) durch Drehung gegenüber einem Träger (12), enthaltend einen am Reflektor befestigten und mittels eines Gelenks (15) vom Träger getragenen Arm (13), wobei das Gelenk dem Arm eine Drehung um zwei zueinander senkrechte Achsen ermöglicht, die durch den Brennpunkt des Reflektors gehen und zu einer Achse des Reflektors senkrecht sind, und eine Antriebseinrichtung für den Arm,
    dadurch gekennzeichnet,
    daß die Einrichtung enthält: einen ersten Rotationsmotor (22), dessen Achse zum Brennpunkt gerichtet ist und der vom Träger (12) getragen wird und einen ersten Hebel (24) antreibt, und einen zweiten Rotationsmotor (26), dessen Achse zum Brennpunkt gerichtet ist und der vom ersten Hebel (24) getragen wird und einen zweiten Hebel (28) antreibt, der mit dem Arm durch eine Schubstange (20) verbunden ist, die sich am zweiten Hebel (28) um eine zum Brennpunkt gerichtete Achse dreht.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Gelenk nur Wälzverbindungen anstatt Gleitverbindungen hat.
  3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß das Universalgelenk aus einem Kardangelenk besteht, dessen Zwischenrahmen (16) den erforderlichen Platz für eine Quelle oder einen Empfänger frei läßt, der am Brennpunkt des Reflektors angeordnet und gegenüber dem Träger festgelegt ist.
  4. Vorrichtung nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß die Schubstange am zweiten Hebel durch ein Wälzager (30) befestigt ist, das Winkelauslenkungen in durch die Drehachse gehenden Ebenen zuläßt.
  5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Radien der Kreise, die von der Achse des zweiten Motors um die Achse des ersten Motors und von der Achse des Lagers um die Achse des zweiten Motors durchlaufen werden, so beschaffen sind, daß die entsprechenden Scheitelwinkel (α) der Kegel jeweils gleich dem halben Scheitelwinkel (2α) des Ausrichtkegels sind.
  6. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Motoren (22, 26) in unmittelbarer Nähe des Trägers angeordnet sind.
EP19910401103 1990-04-30 1991-04-25 Vorrichtung zur Ausrichtung einer Reflektorantenne Expired - Lifetime EP0455543B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9005479A FR2661560B1 (fr) 1990-04-30 1990-04-30 Dispositif de pointage d'un reflecteur d'antenne.
FR9005479 1990-04-30

Publications (2)

Publication Number Publication Date
EP0455543A1 EP0455543A1 (de) 1991-11-06
EP0455543B1 true EP0455543B1 (de) 1994-08-10

Family

ID=9396222

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910401103 Expired - Lifetime EP0455543B1 (de) 1990-04-30 1991-04-25 Vorrichtung zur Ausrichtung einer Reflektorantenne

Country Status (3)

Country Link
EP (1) EP0455543B1 (de)
DE (1) DE69103322D1 (de)
FR (1) FR2661560B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2039164B1 (es) * 1992-01-30 1997-01-01 Sener Ing & Sist Mecanismo de ajuste de alta precision para el posicionado correcto de estructuras deformables.

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2502404A1 (fr) * 1981-03-20 1982-09-24 Matra Dispositif de montage articule, notamment d'un sous-ensemble de satellite artificiel
US4550319A (en) * 1982-09-22 1985-10-29 Rca Corporation Reflector antenna mounted in thermal distortion isolation
DE3411838A1 (de) * 1984-03-30 1985-10-10 ANT Nachrichtentechnik GmbH, 7150 Backnang Schwenkstrahlantenne fuer weltraumfunkstellen
FR2578687B1 (fr) * 1985-03-05 1988-06-10 Hardricourt Constr Blindees Dispositif de support et de reglage d'un radar notamment sur un vehicule ou sur un shelter, et notamment un vehicule blinde
DE3835316A1 (de) * 1988-10-17 1990-04-19 Neuberger Nachrichten Und Ante Parabolantennenhalterung

Also Published As

Publication number Publication date
EP0455543A1 (de) 1991-11-06
FR2661560B1 (fr) 1992-08-07
DE69103322D1 (de) 1994-09-15
FR2661560A1 (fr) 1991-10-31

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