EP0229617A1 - Antenna-orientating device for scanning in two orthogonal directions - Google Patents

Antenna-orientating device for scanning in two orthogonal directions Download PDF

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Publication number
EP0229617A1
EP0229617A1 EP87100050A EP87100050A EP0229617A1 EP 0229617 A1 EP0229617 A1 EP 0229617A1 EP 87100050 A EP87100050 A EP 87100050A EP 87100050 A EP87100050 A EP 87100050A EP 0229617 A1 EP0229617 A1 EP 0229617A1
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EP
European Patent Office
Prior art keywords
mirrors
mirror
axis
antenna
orthogonal directions
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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.)
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EP87100050A
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German (de)
French (fr)
Inventor
Marc Capdepuy
Régis Lenormand
Daniel Renaud
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Alcatel Espace Industries SA
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Alcatel Espace Industries SA
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Publication date
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Publication of EP0229617A1 publication Critical patent/EP0229617A1/en
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    • 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
    • H01Q3/12—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical relative movement between primary active elements and secondary devices of antennas or antenna systems

Definitions

  • the present invention relates to a device for orienting an antenna making it possible to carry out scanning in two orthogonal directions.
  • the invention relates to a device delivering a beam orientable along two orthogonal axes and allowing X-Y scanning.
  • the present invention presents a device for orienting an antenna making it possible to carry out scanning in two orthogonal directions comprising a stationary source, emitting a radioelectric beam, associated with two main and secondary reflectors in offset, characterized in that it comprises a set of at least three mirrors, the first of which is aligned with the secondary reflector and the second and the third of which are integral with two mechanisms for driving in rotation along two axes of orthogonal directions, the direction of the mean axis of the beam between these last two mirrors being that of the beam radiated by the main reflector, the axis of rotation of the first mechanism being collinear with the mean axis of the beam between the first and the second mirror, the axis of rotation of the second mechanism being collinear with the mean axis of the beam coming from the source and which arrives on the third mirror, and in that the main reflectors, and dry the first and the second mirrors are mechanically integral with each other to form a mobile assembly and in that the second mechanism drives both the third mirror and this
  • This invention has the advantage of using two offset reflectors which avoids shadows for the radiation emitted by the main reflector, and makes the entire device particularly compact.
  • the device of the invention is composed of: - a direction ⁇ axis parallel to OX which supports the upper part of the antenna, - a direction ⁇ axis parallel to OY which supports the central part of the antenna and the ⁇ axis, - a fixed part secured to the source.
  • the device of the invention therefore comprises a first assembly movable around the axis ⁇ which comprises: a main reflector 10 in offset, that is to say offset with respect to the top of the parabola which it constitutes, and the center of which is on a line of direction OZ perpendicular to the two axes ⁇ and ⁇ , - a secondary reflector, or sub-reflector, 11 in offset, optionally a lens 12 for focusing the radio beam 21, a first mirror 14 which directs the beam 21, - A second mirror 15 which makes it possible to have two orthogonal axes.
  • This assembly is mounted on the axis of a mechanism 16 which can develop a motor torque large enough to drive the load and which has a high pointing accuracy taking into account the width of the beam.
  • the device comprises a second set which comprises: - a third mirror 17 centered on the axis ⁇ , - the movable part of a mechanism 18 integral with this mirror 17.
  • the drive mechanism 18 around the axis ⁇ may be identical to the drive mechanism 16 around the axis ⁇ . Travel and constraints are much the same.
  • the device finally comprises a fixed part secured to the antenna support, the elements of which can be mechanically connected to one another or be attached individually.
  • This fixed part includes: - The support of the drive mechanism 18 around the axis ⁇ , - a fourth mirror 19, - a source assembly 20 which delivers the radioelectric beam 21.
  • This device which has its stationary source, has the great advantage of avoiding the use of rotating joints and cable reel, and of having to train the radio equipment. It also allows a reduction in the mass to be oriented and a limitation of the disturbing torques.
  • the source 20 emits a radioelectric beam 21 which is reflected successively on the four mirrors 19, 17, 15, 14 before being possibly focused by the converging lens 12 and reaching the sub-reflector 11 then the main reflector 10.
  • the mechanism 18 rotates (22) the mirror 17 along an axis ⁇ ; in a direction parallel to the direction OY, corresponding to the mean axis of the beam 21 between the mirror 19 and the mirror 17.
  • the mirror 17 returns the beam 21 at 90 ° towards the mirror 15.
  • the mirror 15 is integral with the assembly consisting of the mirror 14, the lens 12, the secondary reflector 11, and the main reflector 10.
  • This assembly 15, 14, 12, 11, 10 is mechanically oriented in rotation (23), using the mechanism 16 around the axis ⁇ which is the mean axis of the beam 21 between the mirrors 15 and 14.
  • the mirror 15 therefore receives the beam 21 from the mirror 17 and performs a change of plane to send it in the direction of the mirror 14 which positions said beam 21 in a position centered on the lens 12.
  • the two mechanisms 18 and 16 are therefore positioned in such a way that their axes of rotation ⁇ and ⁇ are coincident with the mean axis of the beam which, respectively, reaches the mirror 17 or which leaves the mirror 15, and are in orthogonal directions between them.
  • the two mirrors 17 and 15 are rotated by the mechanisms 18 and 16 along the axes ⁇ and ⁇ . But each of these two mechanisms drives both the mirror placed on its axis and the upper part of the antenna, along the axis OZ.
  • the drive torque of these mechanisms is greater than the torque required to drive the antenna.
  • the two drive mechanisms 18 and 16 can be identical and include a reduction system which has the advantage of reducing the value of the pitch and increasing the drive torque.
  • Each drive mechanism 18 or 16 comprises an angular coding system, for example a resolver or an optical coder associated with a motor assembly.
  • the different mirrors 19, 17, 15, 14 can be planar or shaped, depending on the applications. At high frequencies the beam 21 from the source can be parallel and the mirrors 19, 17, 15 and 14 are then planes.
  • the source 20 could, in fact, send a beam which directly reaches the mirror 17. But this mirror has the advantage of allowing better positioning of this source 20.
  • This mirror 19 could, in known manner skilled in the art, be replaced by a set of several mirrors.
  • the lens 12 can be eliminated if the beam coming from the mirror 14 is correctly focused to intercept the sub-reflector 11.
  • the antenna orientation system has been shown with an antenna working in transmission, but it would be the same with an antenna working in reception.

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  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Aerials With Secondary Devices (AREA)

Abstract

Dispositif d'orientation d'une antenne permettant de réaliser un balayage selon deux directions orthogonales comprenant une source (20) fixe, émettant un faisceau (21) radioélectrique, associée à deux réflecteurs principal (10) et secondaire (11) en offset, un ensemble d'au moins trois miroirs (14, 15, 17) dont le premier (14) est aligné avec le réflecteur secondaire (11) et dont le deuxième (15) et le troisième (17) miroirs sont solidaires de deux mécanismes (16, 18) d'entraînement en rotation suivant deux axes (Δ, Δ') de directions orthogonales. Les réflecteurs principal (10), et secondaire (11), le premier (14) et le second (15) miroirs sont mécaniquement solidaires entre eux pour former un ensemble mobile. Le second mécanisme (18) entraîne à la fois le miroir (17) et cet ensemble mobile (10, 11, 14, 15). Application au domaine spatial.Device for orienting an antenna enabling scanning in two orthogonal directions comprising a stationary source (20) emitting a radioelectric beam (21), associated with two main (10) and secondary (11) offset reflectors, a set of at least three mirrors (14, 15, 17) of which the first (14) is aligned with the secondary reflector (11) and of which the second (15) and the third (17) mirrors are integral with two mechanisms (16 , 18) rotational drive along two axes (Δ, Δ ') of orthogonal directions. The main (10) and secondary (11) reflectors, the first (14) and the second (15) mirrors are mechanically joined together to form a mobile assembly. The second mechanism (18) drives both the mirror (17) and this movable assembly (10, 11, 14, 15). Application to the space domain.

Description

La présente invention se rapporte à un dispositif d'orientation d'une antenne permettant de réaliser un balayage selon deux directions orthogonales.The present invention relates to a device for orienting an antenna making it possible to carry out scanning in two orthogonal directions.

Pour réaliser ce type de balayage on peut utiliser un système d'entraînement, par exemple cardan selon deux axes X-Y, qui oriente l'ensemble d'une antenne. Mais la source, et éventuellement les équipements radioélectriques, doivent alors être entraînés ce qui provo­que une augmentation de la masse et l'apparition de problème de liaisons électriques avec le support.To carry out this type of scanning, it is possible to use a drive system, for example gimbal along two X-Y axes, which orients an entire antenna. However, the source, and possibly the radio equipment, must then be trained, which causes an increase in mass and the appearance of problems with electrical connections to the support.

On peut également utiliser un tel système pour entraîner uniquement le réflecteur placé en offset, la source restant fixe. Mais le mouvement du réflecteur par rapport à la source entraîne alors une défo­calisation qui peut avoir une incidence sur la loi de phase du rayonnement lorsque le débattement est important et lorsque l'on travaille à des fréquences élevées par exemple supérieures à 20 GHz.One can also use such a system to drive only the reflector placed in offset, the source remaining fixed. However, the movement of the reflector relative to the source then brings about a defocusing which can have an effect on the phase law of the radiation when the deflection is significant and when working at high frequencies for example greater than 20 GHz.

Pour pallier ces inconvénients l'invention a pour objet un dispo­sitif délivrant un faisceau orientable suivant deux axes orthogonaux et permettant un balayage X-Y.To overcome these drawbacks, the invention relates to a device delivering a beam orientable along two orthogonal axes and allowing X-Y scanning.

La présente invention présente à cet effet un dispositif d'orien­tation d'une antenne permettant de réaliser un balayage selon deux directions orthogonales comprenant une source fixe, émettant un faisceau radioélectrique, associée à deux réflecteurs principal et secondaire en offset, caractérisé en ce qu'il comprend un ensemble d'au moins trois miroirs dont le premier est aligné avec le réflecteur secondaire et dont le deuxième et le troisième sont solidaires de deux mécanismes d'entraînement en rotation suivant deux axes de directions orthogonales, la direction de l'axe moyen du faisceau entre ces deux derniers miroirs étant celle du faisceau rayonné par le réflecteur principal, l'axe de rotation du premier mécanisme étant colinéaire avec l'axe moyen du faisceau entre le premier et le second miroir, l'axe de rotation du deuxième mécanisme étant colinéaire avec l'axe moyen du faisceau issu de la source et qui arrive sur le troisième miroir, et en ce que les réflecteurs principal, et secondaire, le premier et le second miroirs sont mécaniquement solidaires entre eux pour former un ensemble mobile et en ce que le second mécanisme entraîne à la fois le troisième miroir et cet ensemble mobile.To this end, the present invention presents a device for orienting an antenna making it possible to carry out scanning in two orthogonal directions comprising a stationary source, emitting a radioelectric beam, associated with two main and secondary reflectors in offset, characterized in that it comprises a set of at least three mirrors, the first of which is aligned with the secondary reflector and the second and the third of which are integral with two mechanisms for driving in rotation along two axes of orthogonal directions, the direction of the mean axis of the beam between these last two mirrors being that of the beam radiated by the main reflector, the axis of rotation of the first mechanism being collinear with the mean axis of the beam between the first and the second mirror, the axis of rotation of the second mechanism being collinear with the mean axis of the beam coming from the source and which arrives on the third mirror, and in that the main reflectors, and dry the first and the second mirrors are mechanically integral with each other to form a mobile assembly and in that the second mechanism drives both the third mirror and this mobile assembly.

Cette invention présente l'avantage d'utiliser deux réflecteurs en offset ce qui évite les zones d'ombre pour le rayonnement émis par le réflecteur principal, et rend l'ensemble du dispositif particulièrement compact.This invention has the advantage of using two offset reflectors which avoids shadows for the radiation emitted by the main reflector, and makes the entire device particularly compact.

Elle permet en outre d'obtenir une orientation du faisceau rayonné­par l'antenne sans avoir recours à une défocalisation de source ou à un déplacement du réflecteur entraînant des aberrations sur le rayonnement.It also makes it possible to obtain an orientation of the beam radiated by the antenna without having to resort to a source defocus or to a displacement of the reflector causing aberrations on the radiation.

Les caractéristiques et avantages de l'invention ressortiront d'ailleurs de la description qui va suivre, à titre d'exemple préféren­tiel, en référence aux dessins annexés sur lesquels :

  • - la figure 1 illustre une représentation schématique partielle du dis­positif selon l'invention,
  • - la figure 2 illustre une représentation schématique en perspective du dispositif selon l'invention.
The characteristics and advantages of the invention will also emerge from the description which follows, by way of a preferred example, with reference to the appended drawings in which:
  • FIG. 1 illustrates a partial schematic representation of the device according to the invention,
  • - Figure 2 illustrates a schematic perspective representation of the device according to the invention.

Le dispositif de l'invention est composé de :
- un axe Δ de direction parallèle à OX qui supporte la partie supérieure de l'antenne,
- un axe Δʹ de direction parallèle à OY qui supporte la partie centrale de l'antenne et l'axe Δ,
- une partie fixe solidaire de la source.The device of the invention is composed of:
- a direction Δ axis parallel to OX which supports the upper part of the antenna,
- a direction Δʹ axis parallel to OY which supports the central part of the antenna and the Δ axis,
- a fixed part secured to the source.

Le dispositif de l'invention comprend donc un premier ensemble mobile autour de l'axe Δ qui comporte :
- un réflecteur principal 10 en offset c'est-à-dire décalé par rapport au sommet de la parabole qu'il constitue, et dont le centre se trouve sur une droite de direction OZ perpendiculaire aux deux axes Δ et Δʹ,
- un réflecteur secondaire, ou subréflecteur, 11 en offset,
- éventuellement une lentille 12 pour focaliser le faisceau radioélec­trique 21,
- un premier miroir 14 qui oriente le faisceau 21,
- un second miroir 15 qui permet d'avoir deux axes orthogonaux.The device of the invention therefore comprises a first assembly movable around the axis Δ which comprises:
a main reflector 10 in offset, that is to say offset with respect to the top of the parabola which it constitutes, and the center of which is on a line of direction OZ perpendicular to the two axes Δ and Δʹ,
- a secondary reflector, or sub-reflector, 11 in offset,
optionally a lens 12 for focusing the radio beam 21,
a first mirror 14 which directs the beam 21,
- A second mirror 15 which makes it possible to have two orthogonal axes.

Cet ensemble se monte sur l'axe d'un mécanisme 16 qui peut développer un couple moteur suffisamment important pour entraîner la charge et qui a une précision de pointage importante compte tenu de la largeur du faisceau.This assembly is mounted on the axis of a mechanism 16 which can develop a motor torque large enough to drive the load and which has a high pointing accuracy taking into account the width of the beam.

Le dispositif comprend un second ensemble qui comporte :
- un troisième miroir 17 centré sur l'axe Δʹ,
- la partie mobile d'un mécanisme 18 solidaire de ce miroir 17.The device comprises a second set which comprises:
- a third mirror 17 centered on the axis Δʹ,
- the movable part of a mechanism 18 integral with this mirror 17.

Le mécanisme 18 d'entraînement autour de l'axe Δʹ peut être iden­tique au mécanisme d'entraînement 16 autour de l'axe Δ. Les débattements et les contraintes sont sensiblement les mêmes.The drive mechanism 18 around the axis Δʹ may be identical to the drive mechanism 16 around the axis Δ. Travel and constraints are much the same.

Le dispositif comprend, enfin, une partie fixe solidaire du support de l'antenne dont les éléments peuvent être reliés mécaniquement entre eux ou être rattachés individuellement. Cette partie fixe comporte :
- Le support du mécanisme 18 d'entraînement autour de l'axe Δʹ,
- un quatrième miroir 19,
- un ensemble source 20 qui délivre le faisceau radioélectrique 21.The device finally comprises a fixed part secured to the antenna support, the elements of which can be mechanically connected to one another or be attached individually. This fixed part includes:
- The support of the drive mechanism 18 around the axis Δʹ,
- a fourth mirror 19,
- a source assembly 20 which delivers the radioelectric beam 21.

Ce dispositif qui a sa source 20 fixe présente le grand avantage d'éviter d'utiliser joints tournants et enrouleur de câble, et d'avoir à entraîner les équipements radioélectriques. Il permet, de plus, une diminution de la masse à orienter et une limitation des couples perturba­teurs.This device, which has its stationary source, has the great advantage of avoiding the use of rotating joints and cable reel, and of having to train the radio equipment. It also allows a reduction in the mass to be oriented and a limitation of the disturbing torques.

La source 20 émet un faisceau radioélectrique 21 qui se réfléchit successivement sur les quatre miroirs 19, 17, 15, 14 avant d'être éventuellement focalisé par la lentille convergente 12 et d'atteindre le subréflecteur 11 puis le réflecteur principal 10.The source 20 emits a radioelectric beam 21 which is reflected successively on the four mirrors 19, 17, 15, 14 before being possibly focused by the converging lens 12 and reaching the sub-reflector 11 then the main reflector 10.

Le mécanisme 18 entraîne en rotation (22) le miroir 17 suivant un axe Δʹ ; de direction parallèle à la direction OY, correspondant à l'axe moyen du faisceau 21 entre le miroir 19 et le miroir 17. Le miroir 17 renvoit le faisceau 21 à 90° vers le miroir 15.The mechanism 18 rotates (22) the mirror 17 along an axis Δʹ; in a direction parallel to the direction OY, corresponding to the mean axis of the beam 21 between the mirror 19 and the mirror 17. The mirror 17 returns the beam 21 at 90 ° towards the mirror 15.

L'axe moyen du faisceau 21 entre les miroirs 17 et 15, coïncidant avec l'axe OZ, correspond à l'axe de rayonnement de l'antenne, c'est-à-dire du faisceau réfléchi 24 par le réflecteur principal 10.The mean axis of the beam 21 between the mirrors 17 and 15, coinciding with the axis OZ, corresponds to the axis of radiation of the antenna, that is to say of the beam reflected 24 by the main reflector 10.

Le miroir 15 est solidaire de l'ensemble constitué du miroir 14, de la lentille 12, du réflecteur secondaire 11, et du réflecteur principal 10.The mirror 15 is integral with the assembly consisting of the mirror 14, the lens 12, the secondary reflector 11, and the main reflector 10.

Cet ensemble 15, 14, 12, 11, 10 est orienté mécaniquement en rota­tion (23), à l'aide du mécanisme 16 autour de l'axe Δ qui est l'axe moyen du faisceau 21 entre les miroirs 15 et 14.This assembly 15, 14, 12, 11, 10 is mechanically oriented in rotation (23), using the mechanism 16 around the axis Δ which is the mean axis of the beam 21 between the mirrors 15 and 14.

Le miroir 15 reçoit donc le faisceau 21 en provenance du miroir 17 et effectue un changement de plan pour l'envoyer en direction du miroir 14 qui positionne ledit faisceau 21 en position centrée sur la lentille 12.The mirror 15 therefore receives the beam 21 from the mirror 17 and performs a change of plane to send it in the direction of the mirror 14 which positions said beam 21 in a position centered on the lens 12.

Les deux mécanismes 18 et 16 sont donc positionnés de telle façon que leurs axes de rotation Δʹ et Δ soient confondus avec l'axe moyen du faisceau qui, respectivement, atteint le miroir 17 ou qui quitte le miroir 15, et soient de directions orthogonales entre eux.The two mechanisms 18 and 16 are therefore positioned in such a way that their axes of rotation Δʹ and Δ are coincident with the mean axis of the beam which, respectively, reaches the mirror 17 or which leaves the mirror 15, and are in orthogonal directions between them.

Les deux miroirs 17 et 15 sont entraînés en rotation par les mécanismes 18 et 16 suivant les axes Δʹ et Δ. Mais chacun de ces deux mécanismes entraîne à la fois le miroir placé sur son axe et la partie supérieure de l'antenne, suivant l'axe OZ.The two mirrors 17 and 15 are rotated by the mechanisms 18 and 16 along the axes Δʹ and Δ. But each of these two mechanisms drives both the mirror placed on its axis and the upper part of the antenna, along the axis OZ.

Le couple d'entraînement de ces mécanismes est supérieur au couple nécessaire à l'entraînement de l'antenne.The drive torque of these mechanisms is greater than the torque required to drive the antenna.

La structure mécanique de liaison entre les différents ensembles, qui doit être adaptée aux contraintes d'environnement, est du domaine connu de l'homme de l'art et n'a donc pas été représentée sur les figures.The mechanical connection structure between the different assemblies, which must be adapted to environmental constraints, is in the field known to those skilled in the art and has therefore not been shown in the figures.

Les deux mécanismes d'entraînement 18 et 16 peuvent être identiques et comporter un système de démultiplication qui a l'avantage de diminuer la valeur du pas de pointage et d'augmenter le couple d'entraînement.The two drive mechanisms 18 and 16 can be identical and include a reduction system which has the advantage of reducing the value of the pitch and increasing the drive torque.

Chaque mécanisme d'entraînement 18 ou 16 comporte un système de codage angulaire par exemple un résolveur ou un codeur optique associé à un ensemble moteur.Each drive mechanism 18 or 16 comprises an angular coding system, for example a resolver or an optical coder associated with a motor assembly.

Il est bien entendu que la présente invention n'a été décrite et représentée qu'à titre d'exemple préférentiel et que l'on pourra remplacer chacun de ses éléments constitutifs par des éléments équivalents sans pour autant sortir du cadre de l'invention.It is understood that the present invention has only been described and shown as a preferred example and that each of its constituent elements can be replaced by equivalent elements without going beyond the ambit of the invention.

Ainsi les différents miroirs 19, 17, 15, 14, peuvent être plans ou conformés, suivant les applications. Aux fréquences élevées le faisceau 21 issu de la source peut être parallèle et les miroirs 19, 17, 15 et 14 sont alors plans.Thus the different mirrors 19, 17, 15, 14, can be planar or shaped, depending on the applications. At high frequencies the beam 21 from the source can be parallel and the mirrors 19, 17, 15 and 14 are then planes.

Ainsi le miroir 19 est facultatif, la source 20 pourrait, en effet, envoyer un faisceau qui atteigne directement le miroir 17. Mais ce miroir a l'avantage de permettre un meilleur positionnement de cette source 20. Ce miroir 19 pourrait, de manière connue de l'homme de l'art, être remplacé par un ensemble de plusieurs miroirs.Thus the mirror 19 is optional, the source 20 could, in fact, send a beam which directly reaches the mirror 17. But this mirror has the advantage of allowing better positioning of this source 20. This mirror 19 could, in known manner skilled in the art, be replaced by a set of several mirrors.

Ainsi la lentille 12 peut être supprimée si le faisceau issu du miroir 14 est correctement focalisé pour intercepter le subréflec­teur 11.Thus the lens 12 can be eliminated if the beam coming from the mirror 14 is correctly focused to intercept the sub-reflector 11.

Le système d'orientation d'antenne a été représenté avec une antenne travaillant en émission, mais il en serait de même avec une antenne travaillant en réception.The antenna orientation system has been shown with an antenna working in transmission, but it would be the same with an antenna working in reception.

Claims (7)

1/ Dispositif d'orientation d'une antenne permettant de réaliser un balayage selon deux directions orthogonales comprenant une source (20) fixe émettant un faisceau (21) radioélectrique associée à deux réflecteurs principal (10) et secondaire (11) en offset, caractérisé en ce qu'il comprend un ensemble d'au moins trois miroirs (14, 15, 17) dont le premier (15) est aligné avec le réflecteur secondaire (11) et dont le deuxième (15) et le troisième (17) sont solidaires de deux mécanismes (16, 18) d'entraînement en rotation suivant deux axes (Δ, Δʹ) de directions orthogonales, la direction de l'axe moyen du faisceau parallèle entre ces deux derniers miroirs (15, 17) étant celle du faisceau (24) rayonné par le réflecteur principal (10), l'axe de rotation du premier mécanisme (16) étant colinéaire avec l'axe moyen du faisceau parallèle entre le premier (14) et le second (15) miroirs, l'axe de rotation du deuxième mécanisme (18) étant colinéaire avec l'axe moyen du faisceau parallèle issu de la source (10) et qui arrive sur le troisième miroir (17), et en ce que les réflecteurs principal (10), et secondaire (11), le premier (14) et le second (15) miroirs sont mécani­quement solidaires entre eux pour former un ensemble mobile et en ce que le second mécanisme (18) entraîne à la fois le miroir (17) et cet ensemble mobile (10, 11, 14, 15).1 / Device for orienting an antenna for scanning in two orthogonal directions comprising a stationary source (20) emitting a radioelectric beam (21) associated with two main (10) and secondary (11) offset reflectors, characterized in that it comprises a set of at least three mirrors (14, 15, 17) of which the first (15) is aligned with the secondary reflector (11) and of which the second (15) and the third (17) are integral with two mechanisms (16, 18) for driving in rotation along two axes (Δ, Δʹ) of orthogonal directions, the direction of the mean axis of the parallel beam between these two latter mirrors (15, 17) being that of the beam (24) radiated by the main reflector (10), the axis of rotation of the first mechanism (16) being collinear with the mean axis of the parallel beam between the first (14) and the second (15) mirrors, the axis of rotation of the second mechanism (18) being collinear with the mean axis of the parallel beam coming from the source (10) and which arrives on the third mirror (17), and in that the main (10) and secondary (11) reflectors, the first (14) and the second (15) mirrors are mechanically integral with one another to form a mobile assembly and in that the second mechanism (18) drives both the mirror (17) and this mobile assembly (10, 11, 14, 15). 2/ Dispositif selon la revendication 1, caractérisé en ce qu'un ensemble d'au moins un miroir (19) est disposé entre la source (10) et le troisième miroir (17).2 / Device according to claim 1, characterized in that a set of at least one mirror (19) is disposed between the source (10) and the third mirror (17). 3/ Dispositif selon l'une quelconque des revendications 1 ou 2, caracté­risé en ce qu'une lentille (12) est disposée entre le miroir (14) et le réflecteur secondaire (11).3 / Device according to any one of claims 1 or 2, characterized in that a lens (12) is disposed between the mirror (14) and the secondary reflector (11). 4/ Dispositif selon l'une quelconque des revendications 1 à 3, caracté­risé en ce que les miroirs (14, 15, 17, 19) sont des miroirs plans.4 / Device according to any one of claims 1 to 3, characterized in that the mirrors (14, 15, 17, 19) are plane mirrors. 5/ Dispositif selon l'une quelconque des revendications 1 à 3, caracté­risé en ce que les miroirs (14, 15, 17, 19) sont des miroirs conformés.5 / Device according to any one of claims 1 to 3, characterized in that the mirrors (14, 15, 17, 19) are shaped mirrors. 6/ Dispositif selon l'une quelconque des revendications 1 à 5, caracté­risé en ce que les mécanismes d'entraînement (16, 18) comportent chacun un système de démultiplication.6 / Device according to any one of claims 1 to 5, characterized in that the drive mechanisms (16, 18) each include a reduction system. 7/ Dispositif selon l'une quelconque des revendications 1 à 6, caracté­risé en ce que chaque mécanisme d'entraînement (16, 18) comporte un système de codage angulaire.7 / Device according to any one of claims 1 to 6, characterized in that each drive mechanism (16, 18) comprises an angular coding system.
EP87100050A 1986-01-09 1987-01-05 Antenna-orientating device for scanning in two orthogonal directions Withdrawn EP0229617A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8600223A FR2592742B1 (en) 1986-01-09 1986-01-09 DEVICE FOR ORIENTING AN ANTENNA FOR PERFORMING A SCANNING ACCORDING TO TWO ORTHOGONAL DIRECTIONS
FR8600223 1986-01-09

Publications (1)

Publication Number Publication Date
EP0229617A1 true EP0229617A1 (en) 1987-07-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP87100050A Withdrawn EP0229617A1 (en) 1986-01-09 1987-01-05 Antenna-orientating device for scanning in two orthogonal directions

Country Status (5)

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US (1) US4821045A (en)
EP (1) EP0229617A1 (en)
JP (1) JPS62160803A (en)
CA (1) CA1257692A (en)
FR (1) FR2592742B1 (en)

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Publication number Priority date Publication date Assignee Title
US5673057A (en) * 1995-11-08 1997-09-30 Trw Inc. Three axis beam waveguide antenna
US7499673B2 (en) * 2004-03-23 2009-03-03 Cisco Technology, Inc. Configurable diversity antenna system for wireless access points

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US3845483A (en) * 1972-03-08 1974-10-29 Nippon Electric Co Antenna system
FR2265190A1 (en) * 1974-03-19 1975-10-17 Thomson Csf
US4042933A (en) * 1976-03-19 1977-08-16 The United States Of America As Represented By The Secretary Of The Navy Antenna line scan system for helicopter wire detection
DE2812627A1 (en) * 1978-03-22 1979-09-27 Siemens Ag Asymmetric Cassegrain directional aerial - has reversing reflector between exciter and collector reflector for very short waves
GB2115229A (en) * 1982-02-15 1983-09-01 Kokusai Denshin Denwa Co Ltd Aerial feed arrangement
DE3400736A1 (en) * 1984-01-11 1985-07-18 Siemens AG, 1000 Berlin und 8000 München Satellite radio ground station antenna arrangement operating on the Cassegrain principle

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Publication number Priority date Publication date Assignee Title
FR1338471A (en) * 1962-08-07 1963-09-27 Gen Electric Co Ltd Position regulator device in particular for radar antenna arrays
JPS5911007A (en) * 1982-07-12 1984-01-20 Nec Corp Antenna device in common use as two-frequency band

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845483A (en) * 1972-03-08 1974-10-29 Nippon Electric Co Antenna system
FR2265190A1 (en) * 1974-03-19 1975-10-17 Thomson Csf
US4042933A (en) * 1976-03-19 1977-08-16 The United States Of America As Represented By The Secretary Of The Navy Antenna line scan system for helicopter wire detection
DE2812627A1 (en) * 1978-03-22 1979-09-27 Siemens Ag Asymmetric Cassegrain directional aerial - has reversing reflector between exciter and collector reflector for very short waves
GB2115229A (en) * 1982-02-15 1983-09-01 Kokusai Denshin Denwa Co Ltd Aerial feed arrangement
DE3400736A1 (en) * 1984-01-11 1985-07-18 Siemens AG, 1000 Berlin und 8000 München Satellite radio ground station antenna arrangement operating on the Cassegrain principle

Also Published As

Publication number Publication date
FR2592742B1 (en) 1988-03-18
FR2592742A1 (en) 1987-07-10
JPS62160803A (en) 1987-07-16
US4821045A (en) 1989-04-11
CA1257692A (en) 1989-07-18

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