EP0455543A1 - Vorrichtung zur Ausrichtung einer Reflektorantenne - Google Patents

Vorrichtung zur Ausrichtung einer Reflektorantenne Download PDF

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Publication number
EP0455543A1
EP0455543A1 EP91401103A EP91401103A EP0455543A1 EP 0455543 A1 EP0455543 A1 EP 0455543A1 EP 91401103 A EP91401103 A EP 91401103A EP 91401103 A EP91401103 A EP 91401103A EP 0455543 A1 EP0455543 A1 EP 0455543A1
Authority
EP
European Patent Office
Prior art keywords
axis
reflector
lever
support
arm
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
EP91401103A
Other languages
English (en)
French (fr)
Other versions
EP0455543B1 (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
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 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.
  • 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 focus 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 rod 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 placed 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 in the case of installation 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 with a 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 necessary 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 link 20 by means 30 allowing a 360 ° rotation around an axis directed towards the focal point F and slight tilting movements.
  • the means 30 can be constituted by 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 during the rotation of the motors and of the 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)
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
FR9005479 1990-04-30
FR9005479A FR2661560B1 (fr) 1990-04-30 1990-04-30 Dispositif de pointage d'un reflecteur d'antenne.

Publications (2)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2039164A2 (es) * 1992-01-30 1993-08-16 Sener Ing & Sist Mecanismo de ajuste de alta precision para el posicionado correcto de estructuras deformables.

Citations (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
GB2127624A (en) * 1982-09-22 1984-04-11 Rca Corp Antenna mounting system
DE3411838A1 (de) * 1984-03-30 1985-10-10 ANT Nachrichtentechnik GmbH, 7150 Backnang Schwenkstrahlantenne fuer weltraumfunkstellen
FR2578687A1 (fr) * 1985-03-05 1986-09-12 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

Patent Citations (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
GB2127624A (en) * 1982-09-22 1984-04-11 Rca Corp Antenna mounting system
DE3411838A1 (de) * 1984-03-30 1985-10-10 ANT Nachrichtentechnik GmbH, 7150 Backnang Schwenkstrahlantenne fuer weltraumfunkstellen
FR2578687A1 (fr) * 1985-03-05 1986-09-12 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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2039164A2 (es) * 1992-01-30 1993-08-16 Sener Ing & Sist Mecanismo de ajuste de alta precision para el posicionado correcto de estructuras deformables.

Also Published As

Publication number Publication date
EP0455543B1 (de) 1994-08-10
FR2661560A1 (fr) 1991-10-31
FR2661560B1 (fr) 1992-08-07
DE69103322D1 (de) 1994-09-15

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