EP2650971A1 - Multiple-reflector antenna for telecommunications satellites - Google Patents

Multiple-reflector antenna for telecommunications satellites Download PDF

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Publication number
EP2650971A1
EP2650971A1 EP13163597.1A EP13163597A EP2650971A1 EP 2650971 A1 EP2650971 A1 EP 2650971A1 EP 13163597 A EP13163597 A EP 13163597A EP 2650971 A1 EP2650971 A1 EP 2650971A1
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EP
European Patent Office
Prior art keywords
shaft
motor
reflector antenna
rotor
reflectors
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
EP13163597.1A
Other languages
German (de)
French (fr)
Other versions
EP2650971B1 (en
Inventor
Jérôme Brossier
Ludovic Schreider
Serge Depeyre
Laurent Cadiergues
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.)
Centre National dEtudes Spatiales CNES
Thales SA
Original Assignee
Commissariat a lEnergie Atomique CEA
Thales SA
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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Publication of EP2650971A1 publication Critical patent/EP2650971A1/en
Application granted granted Critical
Publication of EP2650971B1 publication Critical patent/EP2650971B1/en
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    • 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
    • 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
    • H01Q3/16—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 for varying relative position of primary active element and a reflecting device
    • H01Q3/20—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 for varying relative position of primary active element and a reflecting device wherein the primary active element is fixed and the reflecting device is movable
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • H01Q19/18—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces
    • H01Q19/19—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface
    • H01Q19/192—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface with dual offset reflectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q25/00—Antennas or antenna systems providing at least two radiating patterns

Definitions

  • the present invention relates to a multiple reflector antenna for radiofrequency telecommunication satellite, and in particular a switching device between several sub-reflectors for reflecting a wave beam between a source and a main reflector, such as for example a Gregorian antenna. embedded on a satellite platform in geostationary orbit.
  • an active antenna called a beamforming antenna by calculation is envisaged.
  • these antennas make it possible to point an extended geographical area by moving the beam.
  • these antennas require a complex and expensive electronic module. Indeed, this electronic module requires for example the integration of many computing equipment to determine the orientation of the beam, radiating elements for the formation of the beam, energy supply equipment to power the computing equipment and efficient heat dissipation equipment. Taking these elements into account as a whole substantially increases the design cost and the launch cost in the space of a satellite thus equipped.
  • a switching device is envisaged between several subreflectors mounted on a shaft. By rotating this shaft relative to the frame of the antenna structure on which are held in solidarity with a main reflector and a source, it becomes possible to address several areas of coverage of the earth.
  • the axis of rotation of the carrier tree of the sub-reflectors is contained in a plane, commonly called the focal plane, comprising the center of the main reflector, the center of the subreflector and the source.
  • the focal plane comprising the center of the main reflector, the center of the subreflector and the source.
  • the present invention aims at providing an alternative solution of antenna reflector switching device by overcoming the implementation difficulties mentioned above.
  • the figure 1 represents a block diagram of a multiple reflector antenna 1, comprising a carrier structure 2, to which is attached a main reflector 3 and a source 4.
  • the multiple reflector antenna 1 further comprises a shaft 5, on which are fixed two sub-reflectors 6 and 7, rotating relative to a supporting structure 2.
  • the invention can be implemented for an antenna not comprising a main reflector.
  • the sub-reflectors 6 and 7 then become reflectors for directly reflecting a wave beam between the source 4 and a coverage area.
  • the sub-reflector 6 is in its operational position, able to reflect a wave beam between the source 4 and the main reflector 3.
  • the plane containing the source point of the source 4, the center of the sub-reflector 6 and the center of the main reflector 3 is called the focal plane of the antenna 1 thereafter.
  • the multiple reflector antenna 1 implemented is of Gregorian type.
  • the sub-reflectors 6 and 7 are substantially ellipsoidal in shape and are mounted on the shaft 5 so as to have their concave surface for the reflection of the wave beam between the main reflector 3 and the source 4.
  • a Cassegrain-type multiple reflector antenna 1 is implemented.
  • One or more substantially parabolic sub-reflectors are mounted on the shaft 5 so as to have their convex surface for the reflection of the wave beam between the main reflector 3 and the source 4.
  • the figure 2.a represents a first embodiment of a switching system between several sub-reflectors of an antenna as described in FIG. figure 1 .
  • the multiple reflector antenna 1 comprises the shaft 5, on which are fixed the two sub-reflectors 6 and 7, rotating relative to the carrier structure 2, and a motor 8 comprising a rotor 9 adapted to drive in rotation the 5, and a stator 10 attached to the carrier structure 2.
  • the shaft 5 can rotate relative to the carrier structure 2, along an axis of rotation X1 perpendicular to the focal plane of the antenna.
  • This implementation is particularly advantageous insofar as the portal structure, formed by means of the two bearings 11 and 12, placed on either side of the sub-reflectors 6 and 7, makes it possible to greatly limit the carrier stresses. generated, especially during a launch phase of the satellite. This is not the case for known solutions implementing switching devices in which the axis of rotation X1 of the shaft 5 is in the focal plane of the antenna, involving supporting all the moving elements by only one end, so as not to interfere with the field swept by the wave beam of the antenna.
  • the two bearings 11 and 12 are mechanical bearings.
  • the mechanical filter 13 is a torsionally rigid metal bellows and capable of damping the forces generated by the shaft 5 on the motor 10, and in particular the translational and shearing forces and the bending moments generated during a launch phase of the satellite.
  • the mechanical filter 13 also makes it possible to compensate any misalignment between the axis of rotation X1 of the shaft 5 and the axis of rotation of the motor 8.
  • the motor 8 comprises a radiator 15 able to radiate heat produced by the motor 8 during its operation, and able to heat the motor 8.
  • the radiator 15 is of the electric type for its function of reheating the motor 8.
  • the locking means 14 comprise a finger 17 secured to the rotor 9 and a groove 18 secured to the structure carrier 2.
  • This first embodiment is particularly advantageous because it can effectively protect the motor 8 torsional forces between the rotor 9 and the stator 10 and prevent inadvertent rotational movement of the rotating part during the launch phase of the satellite.
  • the locking means 14 are represented on the Figures 3.a, 3.b and 3.c in a sectional view along an axis X 2 perpendicular to the axis X 1 and passing through the rotor 9 as shown in FIG. figure 2.a .
  • the figure 2.b represents a second embodiment of a switching system between several sub-reflectors of an antenna as described in FIG. figure 1 .
  • the multiple reflector antenna 1 comprises the shaft 5, on which are fixed the two sub-reflectors 6 and 7, rotating relative to the carrier structure 2, and the motor 8 comprising the rotor 9 adapted to drive in rotation. 5, and the stator 10 attached to the carrier structure 2.
  • the shaft 5 can rotate relative to the carrier structure 2, along an axis of rotation X1 perpendicular to the focal plane of the antenna.
  • the locking means 16 comprise a finger 51 integral with the shaft 5 and a groove 52 integral with the supporting structure 2.
  • This second embodiment is particularly advantageous since it makes it possible to rotate the shaft 5 with respect to the carrier structure 2, and thus to protect the motor 8 and the mechanical filter 13 torsion forces generated by the shaft and the components connected thereto.
  • the Figures 3.a, 3.b and 3.c represent the locking means 14 in the stacked position (3.a), in the unloaded position (3.b) and in a position intermediate (3.b), in a sectional view along the axis X2 described on the figure 2.a .
  • the locking means 14 comprise the finger 17 integral with the rotor 9, the groove 18 integral with the carrying structure 2, and a torsion spring 19 which, in a stacked configuration, holds the finger 17 at the bottom of the groove 18; the torsion spring 19 being tilted into a rest position, in a disengaged configuration, by means of the motor 8, making it possible to release the rotor 9 in rotation.
  • the torsion spring 19 holds the finger 17 at the bottom of the groove 18.
  • the torsion spring 19 is stretched between the finger 17 and two holding studs 20 and 21 integral with the supporting structure 2.
  • the motor 8 is able to produce a sufficient force to take off the finger 17 of the groove 18 and release it from the torsion spring 19.
  • the finger 17 is released from the groove 18 and the torsion spring 19.
  • the rotor 9 is free to rotate.
  • the torsion spring 19 is held in the rest position, in the disengaged configuration, between the two holding pads 20 and 21 and a third rest pad 22 integral with the supporting structure 2.
  • the torsion spring 19 is kept taut, in a stacked configuration, between the finger 17 and the two holding pads 20 and 21, integral with the supporting structure 2, and is held in the rest position, in a disengaged configuration, between the two holding studs 20 and 22 and the third rest pad 23, integral with the supporting structure 2.
  • the force generated by the torsion spring 19 on the finger 17 in stacked configuration is sufficient to counter the torsional forces transmitted by the shaft 5 and the components attached thereto, to the motor 8, in particular when a launch phase of the satellite.
  • the torsion spring 19 is a blade of metal material, which opposes a maximum torsional force that can be adjusted by a manual deformation operation prior to mounting in a stacked configuration.
  • This locking means is particularly advantageous because it is simple, easily reconfigurable, and much less expensive than known stacking devices, in particular based on components. electropyrotechnic. In particular, it is possible to reset the torsion spring 19 several times in the stacked position in order to make it possible to test and debug the locking means 14 before a launching phase.
  • the torsion spring 19 and the studs 20, 21 and 22 are positioned so as to allow the rotor 9, in the disengaged configuration, to return to the angular position initially occupied in a stacked configuration, the finger 17 being in mechanical abutment in a first angular position, at the bottom of the groove 18.
  • a second groove 23 secured to the supporting structure 2 makes it possible to put the finger 17 into mechanical abutment in a second angular position.
  • mechanical stops disposed between the shaft 5 and the supporting structure 2, for example between the finger 17 and the grooves 18 and 23, make it possible to limit the amplitude of rotation of the shaft 5, and allow the passage of an electrical wiring 24 between the supporting structure 2 and the shaft 5.
  • the electrical wiring 24 comprises means for grounding the equipment mounted on the shaft 5, and means for supplying a temperature measuring device mounted on the shaft 5.
  • the locking means 16 comprise the finger 51 integral with the shaft 5, the groove 52 secured to the supporting structure 2, and the torsion spring 19 allowing in a stacked configuration to hold the finger 51 at the bottom of the groove 52; the torsion spring 19 being tilted to a rest position, in a disengaged configuration, by means of the motor 8, making it possible to release the shaft 5 in rotation.
  • the figure 4 represents in perspective the multiple reflector antenna 1 according to the two embodiments of the invention.
  • the multiple reflector antenna 1 comprises a carrier structure 2, on which a main reflector 3, a source 4 and a shaft 5 are fixed.
  • Four sub-reflectors 25, 26, 27 and 28 are fixed on the shaft 5.
  • the carrier structure 2 comprises two elevation structures 31 and 32 each formed of a plurality of elevation bars 33; each of the elevation structures 31 and 32 being fixed on the one hand to the frame 28 of the supporting structure 2 and on the other hand to one of the bearings 8 and 9
  • the source 4 is secured to the support structure 2 by means of two fasteners 34 and 35 on the elevation structures 31 and 32.
  • each of the elevation bars 33 comprises a composite material based on carbon fiber.
  • This implementation is particularly advantageous because the carrier structure 2 thus assembled is both stiff and compact, which makes it particularly suitable for application in a very limited available environment, particularly in the vicinity of the sub-reflectors and the swept field by the beam of waves.

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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)
  • Details Of Aerials (AREA)

Abstract

The antenna (1) has a motor (8) including a rotor (9) to drive a shaft (5), and a stator (10) attached to a load-bearing structure (2), where sub-reflectors (6, 7) are attached to the shaft between two bearings. A rigid mechanical filter (13) between the shaft and the rotor enables the rotor to transmit rotational movement to the shaft and to dampen stresses generated by the shaft on the motor. A locking unit holds the angular position of the shaft in relation to the load-bearing structure in a stowed arrangement, and releases the shaft to rotate in an unstowed arrangement.

Description

La présente invention concerne une antenne à réflecteurs multiples pour satellite de télécommuniations par radiofréquence, et en particulier un dispositif de commutation entre plusieurs sous-réflecteurs destinés à réfléchir un faisceau d'ondes entre une source et un réflecteur principal, comme par exemple une antenne grégorienne embarquée sur une plateforme satellite à orbite géostationnaire.The present invention relates to a multiple reflector antenna for radiofrequency telecommunication satellite, and in particular a switching device between several sub-reflectors for reflecting a wave beam between a source and a main reflector, such as for example a Gregorian antenna. embedded on a satellite platform in geostationary orbit.

La durée de vie croissante des satellites de télécommunication et l'évolution des exigences associées aux différentes missions entrainent le développement de nouvelles générations de satellites dont un objectif est d'améliorer la flexibiltié de missions. C'est le cas notamment pour les antennes de télécommunications et leurs mécanismes associés, pour lesquels on cherche par exemple à pouvoir choisir entre plusieurs zones de couvertures et plusieurs plans de fréquence, et ainsi donner la possibilité de modifier en orbite les missions du satellite.The increasing lifespan of telecommunication satellites and the changing requirements associated with the various missions are leading to the development of new generations of satellites whose objective is to improve the flexibility of missions. This is particularly the case for telecommunication antennas and their associated mechanisms, for which it is desired, for example, to be able to choose between several coverage areas and several frequency plans, and thus give the possibility of modifying the missions of the satellite into orbit.

Plusieurs approches sont envisagées pour améliorer la flexibilité de mission des antennes de satellite de télécommunication. Dans une première approche, une antenne active dite antenne à formation de faisceau par calcul est envisagée. Pour améliorer la flexibilité de mission, ces antennes permettent de pointer une surface géographique étendue par déplacement du faisceau. Toutefois, ces antennes nécessitent un module électronique complexe et coûteux. En effet, ce module électronique requiert par exemple l'intégration de nombreux équipements de calcul pour déterminer l'orientation du faisceau, d'éléments rayonnants pour la formation du faisceau, d'équipements de fourniture d'énergie pour alimenter les équipements de calcul et d'équipements performants de dissipation de chaleur. La prise en compte de ces éléments dans leur ensemble augmente sensiblement le coût de conception ainsi que le coût de lancement dans l'espace d'un satellite ainsi équipé.Several approaches are envisaged to improve the mission flexibility of telecommunication satellite antennas. In a first approach, an active antenna called a beamforming antenna by calculation is envisaged. To improve mission flexibility, these antennas make it possible to point an extended geographical area by moving the beam. However, these antennas require a complex and expensive electronic module. Indeed, this electronic module requires for example the integration of many computing equipment to determine the orientation of the beam, radiating elements for the formation of the beam, energy supply equipment to power the computing equipment and efficient heat dissipation equipment. Taking these elements into account as a whole substantially increases the design cost and the launch cost in the space of a satellite thus equipped.

Dans une seconde approche, on envisage un dispositif de commutation entre plusieurs sous-réflecteurs montés sur un arbre. Par rotation de cet arbre par rapport au bati de la structure de l'antenne sur laquelle sont maintenus de façon solidaire un réflecteur principal et une source, il devient possible d'adresser plusieurs zones de couverture du globe terrestre.In a second approach, a switching device is envisaged between several subreflectors mounted on a shaft. By rotating this shaft relative to the frame of the antenna structure on which are held in solidarity with a main reflector and a source, it becomes possible to address several areas of coverage of the earth.

Dans une mise en oeuvre connue, l'axe de rotation de l'arbre porteur des sous-réflecteurs est contenu dans un plan, couramment appelé plan focal, comprenant le centre du réflecteur principal, le centre du sous-réflecteur et la source. Pour ne pas interférer avec le champ balayé par le faisceau d'ondes de l'antenne, il est nécessaire de relier l'arbre porteur des sous-réflecteurs au bati de la structure mécanique par l'arrière de l'antenne, générant un important porte-à-faux. Ce maintien par l'arrière impose une structure mécanique très raide, volumineuse et lourde, pour lui permettre de supporter les efforts rencontrés par la plateforme satellite lors de son lancement par un engin spatial lanceur.In a known implementation, the axis of rotation of the carrier tree of the sub-reflectors is contained in a plane, commonly called the focal plane, comprising the center of the main reflector, the center of the subreflector and the source. In order not to interfere with the field swept by the wave beam of the antenna, it is necessary to connect the carrier shaft of the under-reflectors to the frame of the mechanical structure by the rear of the antenna, generating an important cantilevered. This rear retention imposes a very stiff mechanical structure, bulky and heavy, to enable it to withstand the efforts encountered by the satellite platform when launched by a spacecraft launcher.

Plus généralement, la problématique du gerbage, permettant de maintenir en position l'ensemble des équipements lors d'une phase de lancement, et du dégerbage, permettant de libérer et rendre opérationnels les équipements, est déterminante. Les solutions aujourd'hui envisagées de commutation entre plusieurs réflecteurs ne répondent pas de manière efficace à cette problématique.More generally, the problem of stacking, allowing to maintain in position all the equipment during a launch phase, and the decoupling, to release and make operational equipment, is critical. The solutions currently envisaged for switching between several reflectors do not respond effectively to this problem.

La présente invention vise à proposer une solution alternative de dispositif de commutation de réflecteurs d'antenne en palliant les difficultés de mise en oeuvre citées ci-dessus.The present invention aims at providing an alternative solution of antenna reflector switching device by overcoming the implementation difficulties mentioned above.

A cet effet, l'invention a pour objet une antenne à réflecteurs multiples pour satellite de télécommunications, comprenant un arbre, sur lequel sont fixés au moins deux sous-réflecteurs, tournant par rapport à une structure porteuse, et un moteur comprenant un rotor apte à entrainer en rotation l'arbre, et un stator fixé à la structure porteuse, caractérisée en ce que l'antenne à réflecteurs multiples comprend en outre:

  • deux paliers permettant la rotation de l'arbre par rapport à la structure porteuse, les sous-réflecteurs étant fixés sur l'arbre entre les deux paliers,
  • un filtre mécanique, disposé entre l'arbre et le rotor, rigide en torsion pour permettre au rotor de transmettre le mouvement de rotation à l'arbre, et apte à amortir les efforts générés par l'arbre sur le moteur,
  • des moyens de verrouillage, aptes à figer la position angulaire de l'arbre par rapport à la structure porteuse, dans une première configuration de stockage, dite gerbée, et à libérer l'arbre en rotation au moyen du moteur, dans une configuration opérationnelle, dite dégerbée.
To this end, the subject of the invention is a multiple reflector antenna for a telecommunications satellite, comprising a shaft, on which at least two subreflectors are fixed, rotating with respect to a carrier structure, and an engine comprising a suitable rotor. for rotating the shaft, and a stator fixed to the supporting structure, characterized in that the multiple reflector antenna further comprises:
  • two bearings allowing rotation of the shaft relative to the supporting structure, the sub-reflectors being fixed on the shaft between the two bearings,
  • a mechanical filter, disposed between the shaft and the rotor, torsionally rigid to allow the rotor to transmit the rotational movement to the shaft, and adapted to damp the forces generated by the shaft on the motor,
  • locking means, able to fix the angular position of the shaft relative to the carrier structure, in a first storage configuration, said stacked, and to release the rotating shaft by means of the motor, in an operational configuration, said untied.

L'invention sera mieux comprise et d'autres avantages apparaîtront à la lecture de la description détaillée des modes de réalisation donnés à titre d'exemple sur les figures suivantes.

  • La figure 1 représente un schéma de principe d'une antenne à réflecteurs multiples selon l'invention, munie d'un réflecteur principal, d'une source et de deux sous-réflecteurs commutables par rotation,
  • les figures 2.a et 2.b représentent deux modes de réalisation d'un système de commutation entre plusieurs sous-réflecteurs d'une antenne telle que décrite sur la figure 1,
  • les figures 3.a, 3.b et 3.c représentent des moyens de verrouillage en position gerbée (3.a), en position dégerbée (3.c) et dans une position intermédiaire (3.b) du système de commutation décrit sur la figure 2.a,
  • la figure 4 représente en perspective une antenne à réflecteur multiples selon les deux modes de réalisation de l'invention.
The invention will be better understood and other advantages will appear on reading the detailed description of the embodiments given by way of example in the following figures.
  • The figure 1 represents a block diagram of a multiple reflector antenna according to the invention, provided with a main reflector, a source and two rotatable sub-reflectors,
  • the Figures 2.a and 2.b represent two embodiments of a switching system between several sub-reflectors of an antenna as described in FIG. figure 1 ,
  • the Figures 3.a, 3.b and 3.c represent locking means in stacked position (3.a), in the disengaged position (3.c) and in an intermediate position (3.b) of the switching system described in FIG. figure 2.a ,
  • the figure 4 represents in perspective a multiple reflector antenna according to the two embodiments of the invention.

Par souci de clarté, les mêmes éléments porteront les mêmes repères dans les différentes figures.For the sake of clarity, the same elements will bear the same references in the different figures.

La figure 1 représente un schéma de principe d'une antenne à réflecteurs multiples 1, comprenant une structure porteuse 2, sur laquelle sont fixés un réflecteur principal 3 et une source 4. L'antenne à réflecteurs multiples 1 comprend en outre un arbre 5, sur lequel sont fixés deux sous-réflecteurs 6 et 7, tournant par rapport à une structure porteuse 2.The figure 1 represents a block diagram of a multiple reflector antenna 1, comprising a carrier structure 2, to which is attached a main reflector 3 and a source 4. The multiple reflector antenna 1 further comprises a shaft 5, on which are fixed two sub-reflectors 6 and 7, rotating relative to a supporting structure 2.

Il est entendu que l'invention peut être mise en oeuvre pour une antenne ne comprenant pas de réflecteur principal. Les sous-réflecteurs 6 et 7 deviennent alors des réflecteurs permettant de réfléchir directement un faisceau d'ondes entre la source 4 et une zone de couverture.It is understood that the invention can be implemented for an antenna not comprising a main reflector. The sub-reflectors 6 and 7 then become reflectors for directly reflecting a wave beam between the source 4 and a coverage area.

Sur la figure 1, le sous-réflecteur 6 est dans sa position opérationnelle, apte à réfléchir un faisceau d'ondes entre la source 4 et le réflecteur principal 3. Le plan contenant le point d'émission de la source 4, le centre du sous-réflecteur 6 et le centre du réflecteur principal 3 est appelé plan focal de l'antenne 1 par la suite.On the figure 1 , the sub-reflector 6 is in its operational position, able to reflect a wave beam between the source 4 and the main reflector 3. The plane containing the source point of the source 4, the center of the sub-reflector 6 and the center of the main reflector 3 is called the focal plane of the antenna 1 thereafter.

Sur la figure 1, l'antenne à réflecteurs multiples 1 mise en oeuvre est de type grégorienne. Les sous-réflecteurs 6 et 7 sont de forme sensiblement ellipsoïdales et sont montés sur l'arbre 5 de façon à présenter leur surface concave pour la réflexion du faisceau d'ondes entre le réflecteur principal 3 et la source 4.On the figure 1 , the multiple reflector antenna 1 implemented is of Gregorian type. The sub-reflectors 6 and 7 are substantially ellipsoidal in shape and are mounted on the shaft 5 so as to have their concave surface for the reflection of the wave beam between the main reflector 3 and the source 4.

Dans une configuration alternative de la présente invention, une antenne à réflecteurs multiples 1 de type Cassegrain est mise en oeuvre. Un ou plusieurs sous-réflecteurs de forme sensiblement paraboliques sont montés sur l'arbre 5 de façon à présenter leur surface convexe pour la réflexion du faisceau d'ondes entre le réflecteur principal 3 et la source 4.In an alternative configuration of the present invention, a Cassegrain-type multiple reflector antenna 1 is implemented. One or more substantially parabolic sub-reflectors are mounted on the shaft 5 so as to have their convex surface for the reflection of the wave beam between the main reflector 3 and the source 4.

Il est aussi possible de fixer sur l'arbre 5 un sous-réflecteur 6 présentant sa surface concave pour la réflexion du faisceau d'ondes, et un réflecteur 7 présentant sa surface convexe pour la réflexion du faisceau d'ondes, et ainsi améliorer encore la flexibilité de mission de l'antenne.It is also possible to fix on the shaft 5 a sub-reflector 6 having its concave surface for the reflection of the wave beam, and a reflector 7 having its convex surface for the reflection of the wave beam, and thus further improving the mission flexibility of the antenna.

La figure 2.a représente un premier mode de réalisation d'un système de commutation entre plusieurs sous-réflecteurs d'une antenne telle que décrite sur la figure 1.The figure 2.a represents a first embodiment of a switching system between several sub-reflectors of an antenna as described in FIG. figure 1 .

L'antenne à réflecteurs multiples 1 comprend l'arbre 5, sur lequel sont fixés les deux sous-réflecteurs 6 et 7, tournant par rapport à la structure porteuse 2, et un moteur 8 comprenant un rotor 9 apte à entrainer en rotation l'arbre 5, et un stator 10 fixé à la structure porteuse 2. L'arbre 5 peut tourner par rapport à la structure porteuse 2, selon un axe de rotation X1 perpendiculaire au plan focal de l'antenne.The multiple reflector antenna 1 comprises the shaft 5, on which are fixed the two sub-reflectors 6 and 7, rotating relative to the carrier structure 2, and a motor 8 comprising a rotor 9 adapted to drive in rotation the 5, and a stator 10 attached to the carrier structure 2. The shaft 5 can rotate relative to the carrier structure 2, along an axis of rotation X1 perpendicular to the focal plane of the antenna.

L'antenne à réflecteurs multiples 1 comprend aussi:

  • deux paliers 11 et 12 permettant la rotation de l'arbre 5 par rapport à la structure porteuse 2; les sous-réflecteurs 6 et 7 étant fixés sur l'arbre 5 entre les deux paliers 11 et 12.
  • un filtre mécanique 13, disposé entre l'arbre 5 et le rotor 9, rigide en torsion pour permettre au rotor 9 de transmettre le mouvement de rotation à l'arbre 5, apte à absorber les défauts d'alignements entre le rotor 9 et l'arbre 5, et apte à amortir les efforts générés par l'arbre 5 sur le moteur 8,
  • des moyens de verrouillage 14, aptes à figer la position angulaire de l'arbre 5 par rapport à la structure porteuse 2, dans une première configuration de stockage, dite gerbée, et à libérer l'arbre 5 en rotation au moyen du moteur 8, dans une configuration opérationnelle, dite dégerbée.
The multiple reflector antenna 1 also includes:
  • two bearings 11 and 12 for rotating the shaft 5 relative to the supporting structure 2; the sub-reflectors 6 and 7 being fixed on the shaft 5 between the two bearings 11 and 12.
  • a mechanical filter 13, disposed between the shaft 5 and the rotor 9, rigidly twisted to allow the rotor 9 to transmit the rotational movement to the shaft 5, able to absorb the alignment defects between the rotor 9 and the 5, and capable of damping the forces generated by the shaft 5 on the motor 8,
  • locking means 14 capable of freezing the angular position of the shaft 5 relative to the carrier structure 2, in a first storage configuration, said stacked, and to release the shaft 5 in rotation by means of the motor 8, in an operational configuration, so-called untied.

Cette mise en oeuvre est particulièrement avantageuse dans la mesure où la structure en portique, formée au moyen des deux paliers 11 et 12, placés de part et d'autre des sous-réflecteurs 6 et 7, permet de limiter fortement les efforts de porte-à-faux générés, notamment lors d'une phase de lancement du satellite. Ce n'est pas le cas des solutions connues mettant en oeuvre des dispositifs de commutation dans lesquels l'axe de rotation X1 de l'arbre 5 est dans le plan focal de l'antenne, impliquant de supporter l'ensemble des éléments mobiles par une seule extrémité, pour ne pas interférer avec le champ balayé par le faisceau d'ondes de l'antenne.This implementation is particularly advantageous insofar as the portal structure, formed by means of the two bearings 11 and 12, placed on either side of the sub-reflectors 6 and 7, makes it possible to greatly limit the carrier stresses. generated, especially during a launch phase of the satellite. This is not the case for known solutions implementing switching devices in which the axis of rotation X1 of the shaft 5 is in the focal plane of the antenna, involving supporting all the moving elements by only one end, so as not to interfere with the field swept by the wave beam of the antenna.

Avantageusement, les deux paliers 11 et 12 sont à roulements mécaniques.Advantageously, the two bearings 11 and 12 are mechanical bearings.

Avantageusement, le filtre mécanique 13 est un soufflet métallique rigide en torsion, et apte à amortir les efforts générés par l'arbre 5 sur le moteur 10, et notamment les efforts en translation et en cisaillement ainsi que les moments de flexion générés lors d'une phase de lancement du satellite.Advantageously, the mechanical filter 13 is a torsionally rigid metal bellows and capable of damping the forces generated by the shaft 5 on the motor 10, and in particular the translational and shearing forces and the bending moments generated during a launch phase of the satellite.

Avantageusement, le filtre mécanique 13 permet également de compenser les défauts d'alignement éventuels entre l'axe de rotation X1 de l'arbre 5 et l'axe de rotation du moteur 8.Advantageously, the mechanical filter 13 also makes it possible to compensate any misalignment between the axis of rotation X1 of the shaft 5 and the axis of rotation of the motor 8.

Avantageusement, le moteur 8 comprend un radiateur 15 apte à rayonner de la chaleur produite par le moteur 8 lors de son fonctionnement, et apte à réchauffer le moteur 8.Advantageously, the motor 8 comprises a radiator 15 able to radiate heat produced by the motor 8 during its operation, and able to heat the motor 8.

Avantageusement, le radiateur 15 est de type électrique pour sa fonction de réchauffage du moteur 8.Advantageously, the radiator 15 is of the electric type for its function of reheating the motor 8.

Avantageusement, les moyens de verrouillage 14 comprennent un doigt 17 solidaire du rotor 9 et une rainure 18 solidaire de la structure porteuse 2. Ce premier mode de réalisation est particulièrement avantageux car il permet de protéger efficacement le moteur 8 des efforts de torsion entre le rotor 9 et le stator 10 et d'éviter tout mouvement intempestif en rotation de la partie tournante lors de la phase lancement du satellite. Les moyens de verrouillage 14 sont représentés sur les figures 3.a, 3.b et 3.c dans une vue en coupe selon un axe X2 perpendiculaire à l'axe X1 et traversant le rotor 9 tel que représenté sur la figure 2.a.Advantageously, the locking means 14 comprise a finger 17 secured to the rotor 9 and a groove 18 secured to the structure carrier 2. This first embodiment is particularly advantageous because it can effectively protect the motor 8 torsional forces between the rotor 9 and the stator 10 and prevent inadvertent rotational movement of the rotating part during the launch phase of the satellite. The locking means 14 are represented on the Figures 3.a, 3.b and 3.c in a sectional view along an axis X 2 perpendicular to the axis X 1 and passing through the rotor 9 as shown in FIG. figure 2.a .

La figure 2.b représente un second mode de réalisation d'un système de commutation entre plusieurs sous-réflecteurs d'une antenne telle que décrite sur la figure 1.The figure 2.b represents a second embodiment of a switching system between several sub-reflectors of an antenna as described in FIG. figure 1 .

L'antenne à réflecteurs multiples 1 comprend l'arbre 5, sur lequel sont fixés les deux sous-réflecteurs 6 et 7, tournant par rapport à la structure porteuse 2, et le moteur 8 comprenant le rotor 9 apte à entrainer en rotation l'arbre 5, et le stator 10 fixé à la structure porteuse 2. L'arbre 5 peut tourner par rapport à la structure porteuse 2, selon un axe de rotation X1 perpendiculaire au plan focal de l'antenne.The multiple reflector antenna 1 comprises the shaft 5, on which are fixed the two sub-reflectors 6 and 7, rotating relative to the carrier structure 2, and the motor 8 comprising the rotor 9 adapted to drive in rotation. 5, and the stator 10 attached to the carrier structure 2. The shaft 5 can rotate relative to the carrier structure 2, along an axis of rotation X1 perpendicular to the focal plane of the antenna.

Avantageusement, l'antenne à réflecteurs multiples 1 comprend aussi :

  • les deux paliers 11 et 12,
  • le filtre mécanique 13,
  • des moyens de verrouillage 16, aptes à figer la position angulaire de l'arbre 5 par rapport à la structure porteuse 2, dans une première configuration de stockage, dite gerbée, et à libérer l'arbre 5 en rotation au moyen du moteur 8, dans une configuration opérationnelle, dite dégerbée.
Advantageously, the multiple reflector antenna 1 also comprises:
  • the two levels 11 and 12,
  • the mechanical filter 13,
  • locking means 16, able to freeze the angular position of the shaft 5 relative to the carrier structure 2, in a first storage configuration, said stacked, and to release the shaft 5 in rotation by means of the motor 8, in an operational configuration, so-called untied.

Avantageusement, les moyens de verrouillage 16 comprennent un doigt 51 solidaire de l'arbre 5 et une rainure 52 solidaire de la structure porteuse 2. Ce second mode de réalisation est particulièrement avantageux car il permet de figer en rotation l'arbre 5 par rapport à la structure porteuse 2, et ainsi de protéger le moteur 8 et le filtre mécanique 13 des efforts de torsion générés par l'arbre et les composants qui lui sont reliés.Advantageously, the locking means 16 comprise a finger 51 integral with the shaft 5 and a groove 52 integral with the supporting structure 2. This second embodiment is particularly advantageous since it makes it possible to rotate the shaft 5 with respect to the carrier structure 2, and thus to protect the motor 8 and the mechanical filter 13 torsion forces generated by the shaft and the components connected thereto.

Les figures 3.a, 3.b et 3.c représentent les moyens de verrouillage 14 en position gerbée (3.a), en position dégerbée (3.b) et dans une position intermédiaire (3.b), dans une vue en coupe selon l'axe X2 décrit sur la figure 2.a.The Figures 3.a, 3.b and 3.c represent the locking means 14 in the stacked position (3.a), in the unloaded position (3.b) and in a position intermediate (3.b), in a sectional view along the axis X2 described on the figure 2.a .

Avantageusement, les moyens de verrouillage 14 comprennent le doigt 17 solidaire du rotor 9, la rainure 18 solidaire de la structure porteuse 2, et un ressort de torsion 19 permettant en configuration gerbée de maintenir le doigt 17 au fond de la rainure 18; le ressort de torsion 19 étant basculé dans une position de repos, en configuration dégerbée, au moyen du moteur 8, permettant de libérer en rotation le rotor 9.Advantageously, the locking means 14 comprise the finger 17 integral with the rotor 9, the groove 18 integral with the carrying structure 2, and a torsion spring 19 which, in a stacked configuration, holds the finger 17 at the bottom of the groove 18; the torsion spring 19 being tilted into a rest position, in a disengaged configuration, by means of the motor 8, making it possible to release the rotor 9 in rotation.

Sur la figure 3.a, le ressort de torsion 19 maintient le doigt 17 au fond de la rainure 18. Le ressort de torsion 19 est tendu entre le doigt 17 et deux plots de maintien 20 et 21 solidaires de la structure porteuse 2.On the figure 3.a the torsion spring 19 holds the finger 17 at the bottom of the groove 18. The torsion spring 19 is stretched between the finger 17 and two holding studs 20 and 21 integral with the supporting structure 2.

Sur la figure 3.b, le moteur 8 est apte à produire un effort suffisant pour décoller le doigt 17 de la rainure 18 et le libérer du ressort de torsion 19.On the figure 3.b , the motor 8 is able to produce a sufficient force to take off the finger 17 of the groove 18 and release it from the torsion spring 19.

Sur la figure 3.c, le doigt 17 est libéré de la rainure 18 et du ressort de torsion 19. Le rotor 9 est libre en rotation. Avantageusement, le ressort de torsion 19 est maintenu en position de repos, en configuration dégerbée, entre les deux plots de maintien 20 et 21 et un troisième plot de repos 22 solidaire de la structure porteuse 2.On the figure 3.c the finger 17 is released from the groove 18 and the torsion spring 19. The rotor 9 is free to rotate. Advantageously, the torsion spring 19 is held in the rest position, in the disengaged configuration, between the two holding pads 20 and 21 and a third rest pad 22 integral with the supporting structure 2.

Avantageusement, le ressort de torsion 19 est maintenu tendu, en configuration gerbée, entre le doigt 17 et les deux plots de maintien 20 et 21, solidaire de la structure porteuse 2, et est maintenu en position de repos, en configuration dégerbée, entre les deux plots de maintien 20 et 22 et le troisième plot de repos 23, solidaire de la structure porteuse 2.Advantageously, the torsion spring 19 is kept taut, in a stacked configuration, between the finger 17 and the two holding pads 20 and 21, integral with the supporting structure 2, and is held in the rest position, in a disengaged configuration, between the two holding studs 20 and 22 and the third rest pad 23, integral with the supporting structure 2.

Avantageusement, l'effort généré par le ressort de torsion 19 sur le doigt 17 en configuration gerbée, est suffisant pour contrer les efforts de torsion transmis par l'arbre 5 et les composants qui lui sont fixés, au moteur 8, notamment lors d'une phase de lancement du satellite.Advantageously, the force generated by the torsion spring 19 on the finger 17 in stacked configuration, is sufficient to counter the torsional forces transmitted by the shaft 5 and the components attached thereto, to the motor 8, in particular when a launch phase of the satellite.

Avantageusement, le ressort de torsion 19 est une lame en matière métallique, qui oppose un effort maximal en torsion pouvant être ajusté par une opération de déformation manuelle préalable au montage en configuration gerbée.Advantageously, the torsion spring 19 is a blade of metal material, which opposes a maximum torsional force that can be adjusted by a manual deformation operation prior to mounting in a stacked configuration.

Ce moyen de verrouillage est particulièrement avantageux car il est simple, facilement reconfigurable, et beaucoup moins coûteux que les dispositifs de gerbage connus, notamment basés sur des composants électropyrotechniques. Il est notamment possible de réarmer plusieurs fois le ressort de torsion 19 en position gerbée pour permettre de tester et mettre au point les moyens de verrouillage 14 avant une phase de lancement.This locking means is particularly advantageous because it is simple, easily reconfigurable, and much less expensive than known stacking devices, in particular based on components. electropyrotechnic. In particular, it is possible to reset the torsion spring 19 several times in the stacked position in order to make it possible to test and debug the locking means 14 before a launching phase.

Avantageusement, le ressort de torsion 19 et les plots 20, 21 et 22 sont positionnés de façon à permettre au rotor 9, en configuration dégerbée, de revenir à la position angulaire initialement occupée en configuration gerbée, le doigt 17 étant en butée mécanique dans une première position angulaire, au fond de la rainure 18.Advantageously, the torsion spring 19 and the studs 20, 21 and 22 are positioned so as to allow the rotor 9, in the disengaged configuration, to return to the angular position initially occupied in a stacked configuration, the finger 17 being in mechanical abutment in a first angular position, at the bottom of the groove 18.

Avantageusement, une seconde rainure 23 solidaire de la structure porteuse 2, permet de mettre en butée mécanique le doigt 17 dans une seconde position angulaire.Advantageously, a second groove 23 secured to the supporting structure 2, makes it possible to put the finger 17 into mechanical abutment in a second angular position.

Avantageusement, des butées mécaniques disposées entre l'arbre 5 et la structure porteuse 2, par exemple entre le doigt 17 et les rainures 18 et 23, permettent de limiter l'amplitude de rotation de l'arbre 5, et permettent le passage d'un cablage électrique 24 entre la structure porteuse 2 et l'arbre 5.Advantageously, mechanical stops disposed between the shaft 5 and the supporting structure 2, for example between the finger 17 and the grooves 18 and 23, make it possible to limit the amplitude of rotation of the shaft 5, and allow the passage of an electrical wiring 24 between the supporting structure 2 and the shaft 5.

Avantageusement, le cablage électrique 24 comprend des moyens de mise à la masse des équipements montés sur l'arbre 5, et des moyens d'alimentation d'un dispositif de mesure de température monté sur l'arbre 5.Advantageously, the electrical wiring 24 comprises means for grounding the equipment mounted on the shaft 5, and means for supplying a temperature measuring device mounted on the shaft 5.

Le fonctionnement des moyens de verrouillage 16 est similaire à celui des moyens de verrouillage 14 tels que représentés sur les figures 3.a, 3.b et 3.c. Avantageusement, les moyens de verrouillage 16 comprennent le doigt 51 solidaire de l'arbre 5, la rainure 52 solidaire de la structure porteuse 2, et le ressort de torsion 19 permettant en configuration gerbée de maintenir le doigt 51 au fond de la rainure 52; le ressort de torsion 19 étant basculé dans une position de repos, en configuration dégerbée, au moyen du moteur 8, permettant de libérer en rotation l'arbre 5.The operation of the locking means 16 is similar to that of the locking means 14 as shown in FIGS. Figures 3.a, 3.b and 3.c . Advantageously, the locking means 16 comprise the finger 51 integral with the shaft 5, the groove 52 secured to the supporting structure 2, and the torsion spring 19 allowing in a stacked configuration to hold the finger 51 at the bottom of the groove 52; the torsion spring 19 being tilted to a rest position, in a disengaged configuration, by means of the motor 8, making it possible to release the shaft 5 in rotation.

La figure 4 représente en perspective l'antenne à réflecteur multiples 1 selon les deux modes de réalisation de l'invention. L'antenne à réflecteur multiple 1 comprend une structure porteuse 2, sur laquelle sont fixés un réflecteur principal 3, une source 4 et un arbre 5. Quatre sous-réflecteurs 25, 26, 27 et 28 sont fixés sur l'arbre 5.The figure 4 represents in perspective the multiple reflector antenna 1 according to the two embodiments of the invention. The multiple reflector antenna 1 comprises a carrier structure 2, on which a main reflector 3, a source 4 and a shaft 5 are fixed. Four sub-reflectors 25, 26, 27 and 28 are fixed on the shaft 5.

Avantageusement, la structure porteuse 2 comprend deux structures d'élévation 31 et 32 formées chacune d'une pluralité de barres d'élévation 33; chacune des structures d'élévation 31 et 32 étant fixée d'une part au bati 28 de la structure porteuse 2 et d'autre part à l'un des paliers 8 et 9Advantageously, the carrier structure 2 comprises two elevation structures 31 and 32 each formed of a plurality of elevation bars 33; each of the elevation structures 31 and 32 being fixed on the one hand to the frame 28 of the supporting structure 2 and on the other hand to one of the bearings 8 and 9

Avantageusement la source 4 est solidaire de la structure porteuse 2 au moyen de deux fixations 34 et 35 sur les structures d'élévation 31 et 32.Advantageously, the source 4 is secured to the support structure 2 by means of two fasteners 34 and 35 on the elevation structures 31 and 32.

Avantageusement, chacune des barres d'élévation 33 comprend un matériau composite à base de fibre de carbone.Advantageously, each of the elevation bars 33 comprises a composite material based on carbon fiber.

Cette mise en oeuvre est particulièrement avantageuse car la structure porteuse 2 ainsi assemblée est à la fois raide et peu encombrante, ce qui la rend particulièrement adaptée pour une application dans un environnement disponible très restreint, notamment à proximité des sous-réflecteurs et du champ balayé par le faisceau d'ondes.This implementation is particularly advantageous because the carrier structure 2 thus assembled is both stiff and compact, which makes it particularly suitable for application in a very limited available environment, particularly in the vicinity of the sub-reflectors and the swept field by the beam of waves.

Claims (12)

Antenne à réflecteurs multiples pour satellite de télécommunications, comprenant un arbre (5), sur lequel sont fixés au moins deux sous-réflecteurs (6, 7), tournant par rapport à une structure porteuse (2), et un moteur (8) comprenant un rotor (9) apte à entrainer en rotation l'arbre (5), et un stator (10) fixé à la structure porteuse (2),
caractérisée en ce que l'antenne à réflecteurs multiples (1) comprend en outre : - deux paliers (11 , 12) permettant la rotation de l'arbre (5) par rapport à la structure porteuse (2), les sous-réflecteurs (6, 7) étant fixés sur l'arbre (5) entre les deux paliers (11, 12), - un filtre mécanique (13), disposé entre l'arbre (5) et le rotor (9), rigide en torsion pour permettre au rotor (9) de transmettre le mouvement de rotation à l'arbre (5), apte à absorber les défauts d'alignements entre le rotor (9) et l'arbre (5), et apte à amortir des efforts générés par l'arbre (5) sur le moteur (8), - des moyens de verrouillage (14 ; 16), aptes à figer la position angulaire de l'arbre (5) par rapport à la structure porteuse (2), dans une première configuration de stockage, dite gerbée, et à libérer l'arbre (5) en rotation au moyen du moteur (8), dans une configuration opérationnelle, dite dégerbée. Multi-reflector antenna for telecommunications satellites, comprising a shaft (5), on which at least two sub-reflectors (6, 7), which are rotatable relative to a carrier structure (2), and a motor (8) comprising a rotor (9) capable of rotating the shaft (5), and a stator (10) fixed to the supporting structure (2),
characterized in that the multiple reflector antenna (1) further comprises: - Two bearings (11, 12) for rotating the shaft (5) relative to the carrier structure (2), the sub-reflectors (6, 7) being fixed on the shaft (5) between the two bearings (11, 12), - a mechanical filter (13), disposed between the shaft (5) and the rotor (9), torsionally rigid to allow the rotor (9) to transmit the rotational movement to the shaft (5), able to absorb the misalignments between the rotor (9) and the shaft (5), and adapted to damp the forces generated by the shaft (5) on the motor (8), - Locking means (14; 16) capable of freezing the angular position of the shaft (5) relative to the carrier structure (2) in a first storage configuration, said stacked, and to release the shaft (5) in rotation by means of the motor (8), in an operational configuration, said disengaged. Antenne à réflecteurs multiples selon la revendication 1, caractérisée en ce que les moyens de verrouillage (14) comprennent un doigt (17) solidaire du rotor (9), une rainure (18) solidaire de la structure porteuse (2), et un ressort de torsion (19) permettant en configuration gerbée de maintenir le doigt (17) au fond de la rainure (18); le ressort de torsion (19) étant basculé dans une position de repos, en configuration dégerbée, au moyen du moteur (8), permettant de libérer en rotation le rotor (9)Multi-reflector antenna according to Claim 1, characterized in that the locking means (14) comprise a finger (17) integral with the rotor (9), a groove (18) integral with the carrier structure (2), and a spring torsion device (19) allowing in a stacked configuration to hold the finger (17) at the bottom of the groove (18); the torsion spring (19) being tilted into a rest position, in a disengaged configuration, by means of the motor (8), enabling the rotor (9) to be released in rotation Antenne à réflecteurs multiples selon la revendication 1, caractérisée en ce que les moyens de verrouillage (16) comprennent un doigt (51) solidaire de l'arbre (5), une rainure (52) solidaire de la structure porteuse (2), et un ressort de torsion (19) permettant en configuration gerbée de maintenir le doigt (51) au fond de la rainure (52); le ressort de torsion (19) étant basculé dans une position de repos, en configuration dégerbée, au moyen du moteur (8), permettant de libérer en rotation l'arbre (5)Multiple reflector antenna according to claim 1, characterized in that the locking means (16) comprise a finger (51) integral with the shaft (5), a groove (52) integral with the supporting structure (2), and a torsion spring (19) in a stacked configuration for holding the finger (51) at the bottom of the groove (52); the torsion spring (19) being tilted into a rest position, in a disengaged configuration, by means of the motor (8), enabling the shaft (5) to be released in rotation Antenne à réflecteurs multiples selon l'une des revendications 2 à 3, caractérisée en ce que le ressort de torsion (19) est maintenu tendu, en configuration gerbée, entre le doigt (17 ; 51) et deux plots de maintien (20, 21) solidaire de la structure porteuse (2), et maintenu en position de repos, en configuration dégerbée, entre les deux plots de maintien (20, 21) et un troisième plot de repos (22) solidaire de la structure porteuse (2).Multi-reflector antenna according to one of Claims 2 to 3, characterized in that the torsion spring (19) is held taut in a stacked configuration between the finger (17; 51) and two holding studs (20, 21). ) secured to the carrier structure (2), and maintained in the rest position, in a disengaged configuration, between the two holding pads (20, 21) and a third rest pad (22) integral with the carrier structure (2). Antenne à réflecteurs multiples selon l'une des revendications précédentes, caractérisée en ce que le filtre mécanique (13) est un soufflet métallique, rigide en torsion, et apte à amortir des efforts générés par l'arbre (5) sur le moteur (8), et notamment les efforts en translation, de cisaillement et les moment de flexion générés lors d'une phase de lancement du satellite.Antenna with multiple reflectors according to one of the preceding claims, characterized in that the mechanical filter (13) is a metal bellows, rigid in torsion, and adapted to damp the forces generated by the shaft (5) on the motor (8 ), and in particular the translational, shearing forces and bending moments generated during a launch phase of the satellite. Antenne à réflecteurs multiples selon l'une des revendications précédentes, caractérisée en ce que des butées mécaniques (17, 18, 23) sont disposées entre l'arbre (5) et la structure porteuse (2), de façon à limiter l'amplitude de rotation de l'arbre (5) et permettre le passage d'un cablage électrique (24) entre la structure porteuse (2) et l'arbre (5).Multi-reflector antenna according to one of the preceding claims, characterized in that mechanical stops (17, 18, 23) are arranged between the shaft (5) and the carrier structure (2), so as to limit the amplitude rotation of the shaft (5) and allow the passage of an electrical wiring (24) between the carrier structure (2) and the shaft (5). Antenne à réflecteurs multiples selon la revendication 6, caractérisée en ce que le cablage électrique (24) comprend des moyens de mise à la masse des équipements montés sur l'arbre (5), et des moyens d'alimentation d'un dispositif de mesure de température monté sur l'arbre (5).Multiple reflector antenna according to Claim 6, characterized in that the electrical wiring (24) comprises means for grounding the equipment mounted on the shaft (5), and means for supplying a measuring device mounted on the shaft (5). Antenne à réflecteurs multiples selon l'une des revendications précédentes, caractérisée en ce que le moteur (8) comprend un radiateur (15) apte à rayonner de la chaleur produite par le moteur (8) lors de son fonctionnement, et apte à réchauffer le moteur (8).Antenna with multiple reflectors according to one of the preceding claims, characterized in that the motor (8) comprises a radiator (15) capable of radiating heat produced by the motor (8) during its operation, and adapted to heat the motor (8). Antenne à réflecteurs multiples selon l'une des revendications précédentes, caractérisée en ce que les paliers (11, 12) sont à roulements mécaniques.Multiple reflector antenna according to one of the preceding claims, characterized in that the bearings (11, 12) have mechanical bearings. Antenne à réflecteurs multiples selon l'une des revendications précédentes, caractérisée en ce que la structure porteuse (2) comprend deux structures d'élévation (31, 32), formées chacune d'une pluralité de barres d'élévation (33); chacune des structures d'élévation (31, 32) étant fixée d'une part au bati (29) de la structure porteuse (2) et d'autre part à l'un des paliers (8, 9).Multi-reflector antenna according to one of the preceding claims, characterized in that the carrier structure (2) comprises two elevation structures (31, 32), each formed of a plurality of elevation bars (33); each of the elevation structures (31, 32) being fixed on the one hand to the frame (29) of the supporting structure (2) and on the other hand to one of the bearings (8, 9). Antenne à réflecteurs multiples selon la revendication 10, caractérisée en ce que chacune des barres d'élévation (33) comprend un matériau composite à base de fibre de carbone.Multi-reflector antenna according to claim 10, characterized in that each of the elevation bars (33) comprises a composite material based on carbon fiber. Antenne à réflecteurs multiples selon l'une des revendications précédentes, caractérisée en ce que ledits au moins deux réflecteurs (6 , 7) forment des sous-réflecteurs, en ce que l'antenne à réflecteurs multiples (1) comprend en outre un réflecteur principal (3) et une source (4) fixés sur la structure porteuse (2), en ce qu'en configuration opérationnelle, un des sous-réflecteurs (6, 7) réfléchit un faisceau d'ondes entre la source (4) et le réflecteur principal (3), en ce que la rotation de l'arbre (5) par rapport à la structure porteuse (2) s'effectue autour d'un axe (X1) et en ce que l'axe (X1) est sensiblement perpendiculaire à un plan focal de l'antenne, plan contenant un point d'émission de la source (4), un centre du réflecteur principal (3) et un centre du sous-réflecteur (6, 7) utilisé.Multi-reflector antenna according to one of the preceding claims, characterized in that at least two reflectors (6, 7) form sub-reflectors, in that the multi-reflector antenna (1) further comprises a main reflector (3) and a source (4) fixed on the supporting structure (2), in that in operational configuration, one of the sub-reflectors (6, 7) reflects a wave beam between the source (4) and the main reflector (3), in that the rotation of the shaft (5) with respect to the supporting structure (2) takes place about an axis (X1) and that the axis (X1) is substantially perpendicular to a focal plane of the antenna, plane containing an emission point of the source (4), a center of the main reflector (3) and a center of the subreflector (6, 7) used.
EP13163597.1A 2012-04-13 2013-04-12 Multiple-reflector antenna for telecommunications satellites Active EP2650971B1 (en)

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FR1201099A FR2989523B1 (en) 2012-04-13 2012-04-13 MULTI-REFLECTING ANTENNA FOR TELECOMMUNICATIONS SATELLITE

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US20130271332A1 (en) 2013-10-17
CA2812448A1 (en) 2013-10-13
EP2650971B1 (en) 2014-11-12
CA2812448C (en) 2020-04-28
FR2989523B1 (en) 2014-05-02
CN103378408A (en) 2013-10-30
FR2989523A1 (en) 2013-10-18
ES2526691T3 (en) 2015-01-14
CN103378408B (en) 2017-05-24
US9065173B2 (en) 2015-06-23

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