EP0519855A1 - Compact active antenna for weather satellite - Google Patents

Compact active antenna for weather satellite Download PDF

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Publication number
EP0519855A1
EP0519855A1 EP92480083A EP92480083A EP0519855A1 EP 0519855 A1 EP0519855 A1 EP 0519855A1 EP 92480083 A EP92480083 A EP 92480083A EP 92480083 A EP92480083 A EP 92480083A EP 0519855 A1 EP0519855 A1 EP 0519855A1
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EP
European Patent Office
Prior art keywords
antenna
fork
antennas
axis
directional
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP92480083A
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German (de)
French (fr)
Inventor
Carlo Vanoni
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TECNES SA
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TECNES SA
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Publication date
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Publication of EP0519855A1 publication Critical patent/EP0519855A1/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
    • H01Q1/12—Supports; Mounting means
    • H01Q1/18—Means for stabilising antennas on an unstable platform
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
    • 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
    • H01Q19/28—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 a secondary device in the form of two or more substantially straight conductive elements
    • H01Q19/30—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 a secondary device in the form of two or more substantially straight conductive elements the primary active element being centre-fed and substantially straight, e.g. Yagi antenna

Definitions

  • the subject of the invention is an active antenna of small bulk for meteorological satellite.
  • the present invention relates to a multifrequency antenna comprising a first printed antenna operating at one or more frequencies, and a second antenna disposed in front of the first antenna using the same radiating surface and operating at a different frequency .
  • the radar of the type with quasi-linear modulation of the frequency of the signal transmitted during the pulse, comprises a transmission chain provided with a high frequency oscillator, a transmitting-receiving antenna and a reception chain provided with a pulse compression member.
  • an Impatt diode from a combiner to a diode generates directly at microwave a synchronization signal from the oscillator (pulses modulated according to negative frequency ramps).
  • a clock generator controls in conduction, for each pulse to be transmitted, a switch arranged in series on the supply conductor at substantially constant current of the Impatt diode.
  • reflector comprising load-bearing branches articulated on a support slightly spaced from the latter close radially in the deployed state, carrying a reflective network and pivotable upwards for folding.
  • folding elements which are essentially transverse to them and fixed at preselectable intervals to the reflective network, the folding being effected by successively shortening the intervals between the fixing points.
  • the invention applies in particular to astronautical antenna reflectors.
  • the antenna system for direct broadcast satellite reception consists of a parabolic reflector associated with source means, the reflector being positioned and held by means of a support leg formed by a hollow tubular body fixed in its upper part to the rear central zone of the reflector and articulated in its lower part on a base around a horizontal axis to define the elevation of the antenna.
  • the base has a mobile part in rotation to define the azimuth of the antenna.
  • the tubular body of the support leg has a section sufficient to contain all the circuits associated with the antenna.
  • the field of the invention is that of antennas intended to receive and / or radiate electromagnetic waves in circular polarization, produced by the technology of printed circuits.
  • the problem solved consists in allowing the realization of a low cost antenna, with a wide frequency band, with good efficiency, and the possibility of being used either alone or in a network.
  • the antenna consists of at least one wire or micro-ribbon conductor so as to form a continuous cruciform circuit arranged parallel to a conductive plate from which it is separated by a dielectric layer.
  • the invention finds a preferential application for the equipment of mobile land terminals with satellite communication link.
  • This patent describes a device antenna comprising an antenna for receiving a television broadcast signal and an amplifier located very close to the antenna, connected to the latter to amplify a remote-controlled signal received by the antenna.
  • This is a Yagi antenna in a network of periodic logarythms.
  • the antenna and the amplifier are inserted into an installation, said installation completely inserting the antenna and the amplifier and being highly waterproof.
  • the installation is not electrically conductive, it is made of plastic. It includes a base supporting the antenna and the amplifier as well as an upper closure. A means of electrical supply to the amplifier is incorporated into the installation.
  • the device usable on merchant ships having only a heading reference comprises, on a base, a mount provided with means of orientation in bearing and carrying a gyroscopic assembly with two degrees of freedom whose external dial has an axis of rotation X, perpendicular to the bearing axis and whose internal gimbal has an axis of rotation Y, orthogonal to the axis X and which is linked in pointing to the antenna.
  • the gyroscopic assembly includes a single flywheel of significant angular moment compared to the inertia of the antenna.
  • Each dial is fitted with a torque motor controlled by a loop, the reaction signal of which is supplied by an orientation sensor on the other gimbal.
  • the orientation means around the bearing axis are provided to approximately ensure the average pointing of the antenna in bearing and, consequently, to maintain the gyroscopic assembly near the canonical position.
  • This patent describes a gyroscope using known self-stabilizing means such as sensors, servomotors, etc.
  • METEOSAT and GOES send at a continuous rate photographs of the earth intended for meteorology, seen at 36500 km in height on two radio channels at 1.691 and 1.694 GHZ.
  • the signal is of low power, it can only be received by specific satellite dishes of 1.2 meters in diameter or more.
  • the antenna according to the invention tends to solve all these problems.
  • the antenna targets two applications, according to two embodiments.
  • One is a portable antenna, the other is an antenna for mobile maritime use on small units.
  • the antenna according to the invention reduces the cost of manufacturing this type of antenna.
  • Space-saving meteorological antenna intended for the reception of geostationary meteorological satellites working on the band 1.68 to 1.7 GHZ, of the type housed in a plastic protection with low absorption, the preamplification device being supplied with direct current by a cable coaxial which connects the meteorological antenna to the receiver, characterized in that it comprises one or more directional antennas of the QUAGI type correctly put in phase with a mechanical gain of more than 15 Dbd, said antennas are equipped with a directional device and are activated and amplified by means of a low noise preamplifier placed at the input of the plastic protection so that the receiver can be placed at any distance from the antenna meteorological.
  • the directional antennas are actuated by three servomotors, two servomotors adjust the antenna according to the geographic position of the boat and the third servomotor is slaved to an electronic compass, the whole of the weather antenna is provided with a self-stabilization device.
  • the directional device of the directional antennas is actuated by three servomotors; the set of antennas is integral with a first fork supporting the four antennas; this first fork supports the antennas at the periphery of a disc or of a plate cross; this first fork is controlled in rotation to rotate the disc or cross plate by a servomotor or geared motor which controls the rotation about the axis of polarization from 0 to 360 degrees; said first fork is also articulated at its ends to a second fork arranged in a perpendicular plane and the rotation of which is actuated by a geared motor controlling the elevation axis from 0 to 90 degrees; this second range is also controlled by another geared motor which regulates the rotation of the azimuth axis from 0 to 360 degrees; this azimuth axis is located at the base of the second range.
  • the antenna is mounted on a self-stabilizing device, on a horizontal plane; this device is composed of a fork with vertical branches; this fork receives, at the end of its vertical branches facing upwards, an articulated circle which is itself articulated along an axis diametrically opposite to the plastic protection which forms the dome; all of the directional antennas are integral with this self-stabilizing device by the fork which is fixed by its base to the base of the fork along an axis.
  • FIG. 1 is a schematic view of a meteorological antenna seen in perspective showing the various elements which constitute said antenna.
  • Figure 2 is a schematic view of an antenna meteorological suitable for maritime use highlighting the antennas and the self-stabilization device.
  • FIG 3 is a view according to Figure 2 of the weather antenna, on which the self-stabilizing means of the antenna is shown.
  • the embodiment shown in Figure 1 is a space-saving weather antenna particularly intended to be placed on a mobile vehicle.
  • the weather antenna shown in Figure 1 is housed in a protection 1 of low absorption plastic. It has two directional antennas 2, 3 of the QUAGI type.
  • QUAGI 2 and 3 antennas are correctly phased with a mechanical gain of more than 15 Dbd. Said antennas 2, 3 are activated and amplified by means of a low noise preamplifier 4 arranged with the plastic protection 1 and this, so as to be able to place the receiver not shown in FIG. 1, at any distance from l weather antenna.
  • the preamplification device 4 is continuously supplied by a coaxial cable 5 which connects the weather antenna to the receiver.
  • said meteorological antenna is provided with a three-dimensional self-stabilization device for the whole of the antenna and of three servomotors for directional antennas 8, 9 and 10, 11 of the QUAGI type.
  • Said antenna 6 is housed in a protection 7 with low absorption in the form of a small diameter ball or cylinder, for example 53 cm in diameter.
  • the base of this plastic protection 7 has a truncated cone shape.
  • Said base is fixed to the superstructure of the boat and electrically connected by a cable, not shown in the figures, to protection 7 and to the electrical network.
  • antennas 8, 9, 10 and 11 there are four antennas 8, 9, 10 and 11. These antennas are activated in the same way by a preamplification device not shown in the figure.
  • the antennas 8, 9, 10, 11 are provided with a three-dimensional directional device actuated by three servomotors 12, 13 and 14.
  • the set of antennas is integral with a first fork 15 supporting the four antennas 8, 9 and 10, 11.
  • This first fork supports the antennas 8, 9, 10, 11 at the periphery of a disc 16 or of a plate cross mounted in rotation on the base of the fork 15.
  • This first fork 15 is controlled in rotation to rotate the disc 16 or plate cross by a servomotor or geared motor 12 which controls the rotation about the axis of polarization E, F from 0 to 360 degrees.
  • Said first fork 15 is also articulated at its ends to a second fork 17 arranged in a perpendicular plane and whose rotation is actuated by the geared motor 13 controlling the elevation axis A-B from 0 to 90 degrees.
  • This second fork 17 is also controlled by another geared motor 14 which regulates the rotation of the azimuth axis C-D.
  • This azimuth axis C-D is located at the base of the second range 17.
  • This directional device of the directive antennas 8, 9 and 10, 11 can thus keep the said antennas pointed towards the satellite, by means of the electric compass in combination with the servomotors or geared motors 12, 13 and 14 (which control the rotation about the axis of polarization and rotation around the elevation axis).
  • the assembly of the meteorological antenna is mounted, as shown in FIG. 3, on a self-stabilizing device, on a horizontal plane.
  • This device is composed of a fork 18 with vertical branches 19, 20.
  • This fork 18 receives, at the end of its vertical branches 19, 20 oriented upwards, an articulated circle 21 which is itself articulated along an axis XY diametrically opposite to the plastic protection 7 which forms the dome.
  • All of the directional antennas 8, 9 and 10, 11 are integral with this self-stabilizing device by the fork 17 which is fixed, by its base 22, to the base of the fork 18, along an axis 23.

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  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

The subject of the invention is a meterological antenna. It includes one or more correctly-phased directional antennas (2, 3) of the QUAGI type with a mechanical gain of more than 15 dBd, the said antennas (2, 3) are equipped with a directional device and are activated and amplified by means of a low-noise preamplifier (4) arranged at the entrance to the plastic protection (1) so as to be able to place the receiver any distance from the meteorological antenna. The directional antennas (8, 9, 10, 11) are actuated by three servomotors (12, 13, 14), two servomotors (12, 13) control the antenna as a function of the geographical position of the boat and the third servomotor (14) is slaved to an electronic compass, and the meteorological antenna assembly is provided with a self-stabilising device. Antenna for weather satellite for mobile or maritime installation. <IMAGE>

Description

L'invention a pour objet une antenne active de faible encombrement pour satellite météorologique.The subject of the invention is an active antenna of small bulk for meteorological satellite.

Actuellement l'état de la technique peut être défini par les brevets suivants :Currently the state of the art can be defined by the following patents:

- FR-A-2.627.330 : la présente invention se rapporte à une antenne multifréquence comprenant une première antenne imprimée fonctionnant à une ou plusieurs fréquences, et une seconde antenne disposée devant la première antenne utilisant la même surface rayonnante et fonctionnant à une fréquence différente. - FR-A-2.627.330: the present invention relates to a multifrequency antenna comprising a first printed antenna operating at one or more frequencies, and a second antenna disposed in front of the first antenna using the same radiating surface and operating at a different frequency .

Application notamment au domaine des télécommunications spatiales.Application in particular to the field of space telecommunications.

- FR-A-2.625.327 : le radar, du type à modulation quasi-linéaire de la fréquence du signal émis pendant l'impulsion, comporte une chaîne d'émission munie d'un oscillateur à haute fréquence, une antenne émettrice-réceptrice et une chaîne de réception munie d'un organe de compression d'impulsions. Selon l'invention, dans la chaîne d'émission, une diode Impatt d'un combineur à une diode engendre directement en hyperfréquence un signal de synchronisation de l'oscillateur ( impulsions modulées selon des rampes négatives de fréquence). A cet effet, un générateur d'horloge commande en conduction, pour chaque impulsion à émettre, un interrupteur disposé en série sur le conducteur d'alimentation à courant sensiblement constant de la diode Impatt. - FR-A-2.625.327: the radar, of the type with quasi-linear modulation of the frequency of the signal transmitted during the pulse, comprises a transmission chain provided with a high frequency oscillator, a transmitting-receiving antenna and a reception chain provided with a pulse compression member. According to the invention, in the transmission chain, an Impatt diode from a combiner to a diode generates directly at microwave a synchronization signal from the oscillator (pulses modulated according to negative frequency ramps). For this purpose, a clock generator controls in conduction, for each pulse to be transmitted, a switch arranged in series on the supply conductor at substantially constant current of the Impatt diode.

Application à la cartographie ou à la météorologie.Application to cartography or meteorology.

- FR-A-2.587.548 : réflecteur comportant des branches porteuses articulées sur un support écartées de ce dernier à peu près radialement à l'état déployé, portant un réseau réflecteur et pivotables vers le haut pour le repliage. - FR-A-2.587.548: reflector comprising load-bearing branches articulated on a support slightly spaced from the latter close radially in the deployed state, carrying a reflective network and pivotable upwards for folding.

Entre des branches porteuses voisines sont disposés des éléments de pliage essentiellement transversaux à celles-ci et fixés à intervalles présélectionnables au réseau réflecteur, le repliage s'effectuant par raccourcissement successif des intervalles entre les points de fixation.Between adjacent load-bearing branches are arranged folding elements which are essentially transverse to them and fixed at preselectable intervals to the reflective network, the folding being effected by successively shortening the intervals between the fixing points.

L'invention s'applique notamment aux réflecteurs d'antenne d'astronautique.The invention applies in particular to astronautical antenna reflectors.

- FR-A-2.643.511 : le système d'antenne pour réception de satellite de diffusion directe est constitué d'un réflecteur parabolique associé à des moyens source, le réflecteur étant positionné et maintenu au moyen d'un pied support formé d'un corps tubulaire creux fixé dans sa partie supérieure à la zone centrale arrière du réflecteur et articulé à sa partie inférieure sur un socle autour d'un axe horizontal pour définir l'élévation de l'antenne. - FR-A-2.643.511: the antenna system for direct broadcast satellite reception consists of a parabolic reflector associated with source means, the reflector being positioned and held by means of a support leg formed by a hollow tubular body fixed in its upper part to the rear central zone of the reflector and articulated in its lower part on a base around a horizontal axis to define the elevation of the antenna.

Le socle comporte une partie mobile en rotation pour définir l'azimut de l'antenne. Le corps tubulaire du pied support a une section suffisante pour contenir tous les circuits associés à l'antenne.The base has a mobile part in rotation to define the azimuth of the antenna. The tubular body of the support leg has a section sufficient to contain all the circuits associated with the antenna.

Application, notamment, à la réception de satellites dont les puissances rayonnées sont supérieures à 50 dBW.Application, in particular, to the reception of satellites whose radiated powers are greater than 50 dBW.

- FR-A-2.584.872 : le domaine de l'invention est celui des antennes destinées à recevoir et/ou à rayonner les ondes électromagnétiques en polarisation circulaire, réalisées par la technologie des circuits imprimés. - FR-A-2,584,872: the field of the invention is that of antennas intended to receive and / or radiate electromagnetic waves in circular polarization, produced by the technology of printed circuits.

Le problème résolu consiste à permettre la réalisation d'une antenne de faible coût, à large bande de fréquence, avec un bon rendement, et la possibilité d'être utilisée soit seule, soit en réseau.The problem solved consists in allowing the realization of a low cost antenna, with a wide frequency band, with good efficiency, and the possibility of being used either alone or in a network.

Selon l'invention, l'antenne est constituée d'au moins un conducteur filaire ou micro-ruban de façon à former un circuit continu cruciforme disposé parallèlement à une plaque conductrice dont il est séparé par une couche diélectrique.According to the invention, the antenna consists of at least one wire or micro-ribbon conductor so as to form a continuous cruciform circuit arranged parallel to a conductive plate from which it is separated by a dielectric layer.

L'invention trouve une application préférentielle pour l'équipement des terminaux terrestres mobiles avec liaison de communication par satellite.The invention finds a preferential application for the equipment of mobile land terminals with satellite communication link.

- GB A-207.657 LEADER RADIO : Ce brevet décrit un dispositif d'antenne comprenant une antenne destinée à recevoir un signal d'émission de télévision et un amplificateur situé très près de l'antenne, relié à celle-ci pour amplifier un signal télécommandé reçu par l'antenne. Celle-ci est une antenne Yagi en réseau de logarythmes périodiques. L'antenne et l'amplificateur sont insérés dans une installation, ladite installation insérant complètement l'antenne et l'amplificateur et étant hautement étanche. L'installation n'est pas conductrice d'électricité, elle est constituée de matières plastiques. Elle comprend une base supportant l'antenne et l'amplificateur ainsi qu'une fermeture supérieure. Un moyen d'alimentation électrique de l'amplificateur est incorporé dans l'installation. - GB A-207.657 RADIO LEADER: This patent describes a device antenna comprising an antenna for receiving a television broadcast signal and an amplifier located very close to the antenna, connected to the latter to amplify a remote-controlled signal received by the antenna. This is a Yagi antenna in a network of periodic logarythms. The antenna and the amplifier are inserted into an installation, said installation completely inserting the antenna and the amplifier and being highly waterproof. The installation is not electrically conductive, it is made of plastic. It includes a base supporting the antenna and the amplifier as well as an upper closure. A means of electrical supply to the amplifier is incorporated into the installation.

Il s'agit là d'une antenne dite "antenne active" pour télévision. Elle est active dans une bande très large, inférieure à 800 mega HZ.This is a so-called "active antenna" for television. It is active in a very wide band, less than 800 mega HZ.

Il n'est pas décrit et certainement pas suggéré de dispositif directionnel pour des antennes directives, l'ensemble n'est pas monté sur un dispositif autostabilisant. Cette invention a peu de rapport avec l'invention.It is not described and certainly not suggested a directional device for directional antennas, the assembly is not mounted on a self-stabilizing device. This invention has little to do with the invention.

- EP-A-0.142.397 : Le dispositif utilisable sur navires marchands ne comportant qu'une référence de cap, comprend, sur un soccle, une monture munie de moyens d'orientation en gisement et portant un ensemble gyroscopique à deux degrés de liberté dont le cadran externe a un axe de rotation X, perpendiculaire à l'axe de gisement et dont le cardan interne a un axe de rotation Y, orthogonal à l'axe X et qui est lié en pointage à l'antenne. L'ensemble gyroscopique comporte un volant unique de moment cinétique important par rapport à l'inertie de l'antenne. Chaque cadran est muni d'un moteur couple commandé par une boucle dont le signal de réaction est fourni par un capteur d'orientation de l'autre cardan. Les moyens d'orientation autour de l'axe de gisement sont prévus pour assurer approximativement le pointage moyen de l'antenne en gisement et, en conséquence, maintenir l'ensemble gyroscopique à proximité de la position canonique. Ce brevet décrit un gyroscope utilisant des moyens autostabilisants connus tels des capteurs, des servomoteurs, etc.- EP-A-0.142.397: The device usable on merchant ships having only a heading reference, comprises, on a base, a mount provided with means of orientation in bearing and carrying a gyroscopic assembly with two degrees of freedom whose external dial has an axis of rotation X, perpendicular to the bearing axis and whose internal gimbal has an axis of rotation Y, orthogonal to the axis X and which is linked in pointing to the antenna. The gyroscopic assembly includes a single flywheel of significant angular moment compared to the inertia of the antenna. Each dial is fitted with a torque motor controlled by a loop, the reaction signal of which is supplied by an orientation sensor on the other gimbal. The orientation means around the bearing axis are provided to approximately ensure the average pointing of the antenna in bearing and, consequently, to maintain the gyroscopic assembly near the canonical position. This patent describes a gyroscope using known self-stabilizing means such as sensors, servomotors, etc.

La combinaison des caractéristiques techniques ne se retrouvent pas dans ce brevet. Le but et l'application sont très différents.The combination of technical characteristics is not found in this patent. The purpose and application are very different.

Actuellement, les satellites météorologiques dénommés METEOSAT et GOES envoient à un rythme continu des photographies de la terre destinées à la météorologie, vues à 36500 km de hauteur sur deux canaux radio à 1,691 et 1,694 GHZ. Le signal est de faible puissance, il ne peut être reçu que par des antennes spécifiques paraboliques de 1,2 mètres de diamètre ou plus.Currently, the meteorological satellites called METEOSAT and GOES send at a continuous rate photographs of the earth intended for meteorology, seen at 36500 km in height on two radio channels at 1.691 and 1.694 GHZ. The signal is of low power, it can only be received by specific satellite dishes of 1.2 meters in diameter or more.

Ces antennes spécifiques ne posent pas de problème pour les installations fixes, par exemple, pour les installations militaires ou scientifiques.These specific antennas are not a problem for fixed installations, for example, for military or scientific installations.

Pour l'utilisation sur des bateaux, il est nécessaire que ceux-ci aient déjà une taille importante pour pouvoir accueillir de telles antennes avec de telles dimensions.For use on boats, it is necessary that these already have a large size to be able to accommodate such antennas with such dimensions.

De plus en plus, l'utilisation des informations météorologiques sur des installations mobiles ou sur de petites unités se fait sentir. Il est donc nécessaire de disposer d'une antenne spécifique portable ou tout au moins de faible encombrement.Increasingly, the use of meteorological information on mobile installations or on small units is becoming apparent. It is therefore necessary to have a specific portable or at least small footprint antenna.

L'antenne selon l'invention tend à résoudre tous ces problèmes.The antenna according to the invention tends to solve all these problems.

L'antenne vise deux applications, selon deux modes de réalisation.The antenna targets two applications, according to two embodiments.

L'une est une antenne portable, l'autre est une antenne pour un emploi maritime mobile sur de petites unités.One is a portable antenna, the other is an antenna for mobile maritime use on small units.

De plus, l'antenne selon l'invention réduit le coût de fabrication de ce type d'antenne.In addition, the antenna according to the invention reduces the cost of manufacturing this type of antenna.

Antenne météorologique de faible encombrement destinée à la réception des satellites géostationnaires météorologiques travaillant sur la bande 1,68 à 1,7 GHZ, du type logée dans une protection de plastique à faible absorption, le dispositif de préamplification étant alimenté en courant continu par un câble coaxial qui relie l'antenne météorologique au récepteur, caractérisée par le fait qu'elle comporte une ou plusieurs antennes directives du type QUAGI correctement mises en phase avec un gain mécanique de plus de 15 Dbd, lesdites antennes sont équipées d'un dispositif directionnel et sont activées et amplifiées au moyen d'un préamplificateur à faible bruit disposé à l'entrée de la protection plastique de manière à pouvoir placer le récepteur à n'importe quelle distance de l'antenne météorologique.Space-saving meteorological antenna intended for the reception of geostationary meteorological satellites working on the band 1.68 to 1.7 GHZ, of the type housed in a plastic protection with low absorption, the preamplification device being supplied with direct current by a cable coaxial which connects the meteorological antenna to the receiver, characterized in that it comprises one or more directional antennas of the QUAGI type correctly put in phase with a mechanical gain of more than 15 Dbd, said antennas are equipped with a directional device and are activated and amplified by means of a low noise preamplifier placed at the input of the plastic protection so that the receiver can be placed at any distance from the antenna meteorological.

Dans le cas d'une application maritime mobile, les antennes directives sont actionnées par trois servomoteurs, deux servomoteurs règlent l'antenne en fonction de la position géographique du bateau et le troisième servomoteur est asservi à un compas électronique, l'ensemble de l'antenne météorologique est pourvu d'un dispositif d'autostabilisation.In the case of a mobile maritime application, the directional antennas are actuated by three servomotors, two servomotors adjust the antenna according to the geographic position of the boat and the third servomotor is slaved to an electronic compass, the whole of the weather antenna is provided with a self-stabilization device.

Le dispositif directionnel des antennes directives est actionné par trois servomoteurs ; l'ensemble des antennes est solidaire d'une première fourchette supportant les quatre antennes; cette première fourchette supporte les antennes à la périphérie d'un disque ou d'une croix plaque ; cette première fourchette est commandée en rotation pour faire tourner le disque ou croix plaque par un servomoteur ou motoréducteur qui commande la rotation autour de l'axe de polarisation de 0 à 360 degrés; ladite première fourchette est également articulée à ses extrémités à une seconde fourchette disposée dans un plan perpendiculaire et dont la rotation est actionnée par un moteur motoréducteur commandant l'axe d'élévation de 0 à 90 degrés ; cette deuxième fourchette est également commandée par un autre motoréducteur qui règle la rotation de l'axe d'azimut de 0 à 360 degrés ; cette axe d'azimut est situé à la base de la seconde fourchette.The directional device of the directional antennas is actuated by three servomotors; the set of antennas is integral with a first fork supporting the four antennas; this first fork supports the antennas at the periphery of a disc or of a plate cross; this first fork is controlled in rotation to rotate the disc or cross plate by a servomotor or geared motor which controls the rotation about the axis of polarization from 0 to 360 degrees; said first fork is also articulated at its ends to a second fork arranged in a perpendicular plane and the rotation of which is actuated by a geared motor controlling the elevation axis from 0 to 90 degrees; this second range is also controlled by another geared motor which regulates the rotation of the azimuth axis from 0 to 360 degrees; this azimuth axis is located at the base of the second range.

L'antenne est montée sur un dispositif autostabilisant, sur un plan horizontal ; ce dispositif est composé d'une fourchette aux branches verticales ; cette fourchette reçoit, à l'extrémité de ses branches verticales orientées vers le haut, un cercle articulé qui est lui-même articulé selon un axe diamétralement opposé à la protection en plastique qui forme la coupole ; l'ensemble des antennes directives est solidaire de ce dispositif autostabilisant par la fourchette qui est fixée par sa base à la base de la fourchette suivant un axe.The antenna is mounted on a self-stabilizing device, on a horizontal plane; this device is composed of a fork with vertical branches; this fork receives, at the end of its vertical branches facing upwards, an articulated circle which is itself articulated along an axis diametrically opposite to the plastic protection which forms the dome; all of the directional antennas are integral with this self-stabilizing device by the fork which is fixed by its base to the base of the fork along an axis.

Les dessins ci-joints sont donnés à titre d'exemples indicatifs et non limitatifs. Ils représentent un mode de réalisation préféré selon l'invention. Ils permettront de comprendre aisément l'invention.The attached drawings are given as indicative and non-limiting examples. They represent a preferred embodiment according to the invention. They will allow the invention to be easily understood.

La figure 1 est une vue schématique d'une antenne météorologique vue en perspective mettant en évidence les différents éléments qui constituent ladite antenne.FIG. 1 is a schematic view of a meteorological antenna seen in perspective showing the various elements which constitute said antenna.

La figure 2 est une vue schématique d'une antenne météorologique adaptée à un emploi maritime mettant en évidence les antennes et le dispositif d'autostabilisation.Figure 2 is a schematic view of an antenna meteorological suitable for maritime use highlighting the antennas and the self-stabilization device.

La figure 3 est une vue selon la figure 2 de l'antenne météorologique, sur laquelle le moyen autostabilisant de l'antenne est représenté.Figure 3 is a view according to Figure 2 of the weather antenna, on which the self-stabilizing means of the antenna is shown.

Le mode de réalisation représenté à la figure 1 est une antenne météorologique de faible encombrement particulièrement destinée à être mise en place sur un engin mobile.The embodiment shown in Figure 1 is a space-saving weather antenna particularly intended to be placed on a mobile vehicle.

L'antenne météorologique représentée à la figure 1, est logée dans une protection 1 de plastique à faible absorption. Elle comporte deux antennes directives 2, 3 du type QUAGI.The weather antenna shown in Figure 1, is housed in a protection 1 of low absorption plastic. It has two directional antennas 2, 3 of the QUAGI type.

Les antennes QUAGI 2 et 3 sont correctement mises en phase avec un gain mécanique de plus de 15 Dbd. Lesdites antennes 2, 3 sont activées et amplifiées au moyen d'un préamplificateur 4 à faible bruit disposé de la protection plastique 1 et ce, de manière à pouvoir disposer le récepteur non représenté sur la figure 1, à n'importe quelle distance de l'antenne météorologique.QUAGI 2 and 3 antennas are correctly phased with a mechanical gain of more than 15 Dbd. Said antennas 2, 3 are activated and amplified by means of a low noise preamplifier 4 arranged with the plastic protection 1 and this, so as to be able to place the receiver not shown in FIG. 1, at any distance from l weather antenna.

Le dispositif de préamplification 4 est alimenté en continu par un câble coaxial 5 qui relie l'antenne météorologique au récepteur.The preamplification device 4 is continuously supplied by a coaxial cable 5 which connects the weather antenna to the receiver.

Dans le mode de réalisation représenté à la figure 3, et qui est particulièrement destiné à une application maritime mobile de l'antenne, ladite antenne météorologique est pourvue d'un dispositif d'autostabilisation en trois dimensions de l'ensemble de l'antenne et de trois servomoteurs pour les antennes directives 8, 9 et 10, 11 du type QUAGI.In the embodiment shown in FIG. 3, which is particularly intended for a mobile maritime application of the antenna, said meteorological antenna is provided with a three-dimensional self-stabilization device for the whole of the antenna and of three servomotors for directional antennas 8, 9 and 10, 11 of the QUAGI type.

Ladite antenne 6 est logée dans une protection 7 à faible absorption en forme de boule ou de cylindre de faible diamètre, par exemple 53 centimètres de diamètre.Said antenna 6 is housed in a protection 7 with low absorption in the form of a small diameter ball or cylinder, for example 53 cm in diameter.

La base de cette protection plastique 7 a une forme de tronc de cône.The base of this plastic protection 7 has a truncated cone shape.

Ladite base est fixée à la superstructure du bateau et raccordée électriquement par un câble, non représenté sur les figures, à la protection 7 et au réseau électrique.Said base is fixed to the superstructure of the boat and electrically connected by a cable, not shown in the figures, to protection 7 and to the electrical network.

Dans ce mode de réalisation, on retrouve quatre antennes 8, 9, 10 et 11. Ces antennes sont activées de la même manière par un dispositif de préamplification non représenté sur la figure.In this embodiment, there are four antennas 8, 9, 10 and 11. These antennas are activated in the same way by a preamplification device not shown in the figure.

Les antennes 8, 9, 10, 11 sont pourvues d'un dispositif directionnel en trois dimensions actionné par trois servomoteurs 12, 13 et 14.The antennas 8, 9, 10, 11 are provided with a three-dimensional directional device actuated by three servomotors 12, 13 and 14.

L'ensemble des antennes est solidaire d'une première fourchette 15 supportant les quatre antennes 8, 9 et 10, 11.The set of antennas is integral with a first fork 15 supporting the four antennas 8, 9 and 10, 11.

Cette première fourchette supporte les antennes 8, 9, 10, 11 à la périphérie d'un disque 16 ou d'une croix plaque montée en rotation sur la base de la fourchette 15.This first fork supports the antennas 8, 9, 10, 11 at the periphery of a disc 16 or of a plate cross mounted in rotation on the base of the fork 15.

Cette première fourchette 15 est commandée en rotation pour faire tourner le disque 16 ou croix plaque par un servomoteur ou motoréducteur 12 qui commande la rotation autour de l'axe de polarisation E, F de 0 à 360 degrés.This first fork 15 is controlled in rotation to rotate the disc 16 or plate cross by a servomotor or geared motor 12 which controls the rotation about the axis of polarization E, F from 0 to 360 degrees.

Ladite première fourchette 15 est également articulée à ses extrémités à une seconde fourchette 17 disposée dans un plan perpendiculaire et dont la rotation est actionnée par le moteur motoréducteur 13 commandant l'axe d'élévation A-B de 0 à 90 degrés.Said first fork 15 is also articulated at its ends to a second fork 17 arranged in a perpendicular plane and whose rotation is actuated by the geared motor 13 controlling the elevation axis A-B from 0 to 90 degrees.

Cette deuxième fourchette 17 est également commandée par un autre motoréducteur 14 qui règle la rotation de l'axe d'azimut C-D.This second fork 17 is also controlled by another geared motor 14 which regulates the rotation of the azimuth axis C-D.

Cet axe d'azimut C-D est situé à la base de la deuxième fourchette 17.This azimuth axis C-D is located at the base of the second range 17.

Ce dispositif directionnel des antennes directives 8, 9 et 10, 11 peut ainsi maintenir pointées lesdites antennes vers le satellite, grâce au compas électrique en combinaison avec les servomoteurs ou motoréducteurs 12, 13 et 14 (qui commandent la rotation autour de l'axe de polarisation et la rotation autour de l'axe d'élévation).This directional device of the directive antennas 8, 9 and 10, 11 can thus keep the said antennas pointed towards the satellite, by means of the electric compass in combination with the servomotors or geared motors 12, 13 and 14 (which control the rotation about the axis of polarization and rotation around the elevation axis).

L'ensemble de l'antenne météorologique est monté, comme représenté sur la figure 3, sur un dispositif autostabilisant, sur un plan horizontal. Ce dispositif est composé d'une fourchette 18 aux branches verticales 19, 20. Cette fourchette 18 reçoit, à l'extrémité de ses branches verticales 19, 20 orientées vers le haut, un cercle articulé 21 qui est lui-même articulé selon un axe X-Y diamétralement opposé à la protection en plastique 7 qui forme la coupole.The assembly of the meteorological antenna is mounted, as shown in FIG. 3, on a self-stabilizing device, on a horizontal plane. This device is composed of a fork 18 with vertical branches 19, 20. This fork 18 receives, at the end of its vertical branches 19, 20 oriented upwards, an articulated circle 21 which is itself articulated along an axis XY diametrically opposite to the plastic protection 7 which forms the dome.

L'ensemble des antennes directives 8, 9 et 10, 11 est solidaire de ce dispositif autostabilisant par la fourchette 17 qui est fixée, par sa base 22, à la base de la fourchette 18, suivant un axe 23.All of the directional antennas 8, 9 and 10, 11 are integral with this self-stabilizing device by the fork 17 which is fixed, by its base 22, to the base of the fork 18, along an axis 23.

REFERENCESREFERENCES

  • 1. Protection de plastique antenne mobile1. Protection of plastic mobile antenna
  • 2, 3. Antennes QUAGI2, 3. QUAGI antennas
  • 4. Préamplificateur4. Preamplifier
  • 5. Câble coaxial5. Coaxial cable
  • 6. Antenne mobile maritime6. Maritime mobile antenna
  • 7. Protection plastique antenne mobile maritime7. Plastic protection for maritime mobile antenna
  • 8, 9, 10, 11. Antennes8, 9, 10, 11. Antennas
  • 12, 13, 14. Servomoteurs ou motoréducteur12, 13, 14. Servomotors or gearmotor
  • 15. Première fourchette15. First fork
  • 16. Disque ou plaque en croix16. Cross disc or plate
  • 17. Deuxième fourchette
    • A-B Axe d'élévation
    • C-D Axe d'azimut
    • E-F Axe de polarisation
    17. Second fork
    • AB Elevation axis
    • CD Azimuth axis
    • EF Polarization axis
  • 18. Fourchette18. Fork
  • 19, 20 Branches verticales de la fourchette 1819, 20 Vertical branches of the fork 18
  • 21. Cercle articulé21. Articulated circle
  • 22. Base de la fourchette 1722. Base of fork 17

Claims (4)

Antenne météorologique de faible encombrement destinée à la réception des satellites géostationnaires météorologiques travaillant sur la bande (2) 1,68 à 1,7 GHZ, du type logée dans une protection (1) de plastique à faible absorption, le dispositif de préamplification étant alimenté en courant continu par un câble coaxial (5) qui relie l'antenne météorologique au récepteur, caractérisée par le fait
   qu'elle comporte une ou plusieurs antennes (2, 3) directives du type QUAGI correctement mises en phase avec un gain mécanique de plus de 15 Dbd, lesdites antennes (2, 3) sont équipées d'un dispositif directionnel et sont activées et amplifiées au moyen d'un préamplificateur (4) à faible bruit disposé à l'entrée de la protection plastique (1) de manière à pouvoir placer le récepteur à n'importe quelle distance de l'antenne météorologique.Space-saving meteorological antenna intended for the reception of geostationary meteorological satellites working on the band (2) 1.68 to 1.7 GHZ, of the type housed in a protection (1) of low-absorption plastic, the preamplification device being supplied in direct current by a coaxial cable (5) which connects the weather antenna to the receiver, characterized by the fact
that it includes one or more antennas (2, 3) directives of the QUAGI type correctly aligned with a mechanical gain of more than 15 Dbd, said antennas (2, 3) are equipped with a directional device and are activated and amplified by means of a low noise preamplifier (4) placed at the entrance to the plastic protection (1) so that the receiver can be placed at any distance from the weather antenna. Antenne météorologique de faible encombrement, selon la revendication 1 caractérisée par le fait
   que dans le cas d'une application maritime mobile, les antennes directives (8, 9, 10, 11) sont actionnées par trois servomoteurs (12, 13, 14), deux servomoteurs (12, 13) règlent l'antenne en fonction de la position géographique du bateau et le troisième servomoteur (14) est asservi à un compas électronique, l'ensemble de l'antenne météorologique est pourvu d'un dispositif d'autostabilisation.Space-saving weather antenna according to claim 1 characterized in that
that in the case of a mobile maritime application, the directional antennas (8, 9, 10, 11) are actuated by three servomotors (12, 13, 14), two servomotors (12, 13) regulate the antenna according to the geographic position of the boat and the third servomotor (14) is controlled by an electronic compass, the entire weather antenna is provided with a self-stabilizing device. Antenne météorologique de faible encombrement selon la revendication 2 caractérisée par le fait
   que le dispositif directionnel des antennes directives est actionné par trois servomoteurs (12, 13 et 14) ; l'ensemble des antennes est solidaire d'une première fourchette (15) supportant les quatre antennes (8, 9, 10, 11) ; cette première fourchette supporte les antennes (8, 9, 10, 11) à la périphérie d'un disque (16) ou d'une croix plaque ; cette première fourchette (15) est commandée en rotation pour faire tourner le disque (16) ou croix plaque par un servomoteur ou motoréducteur (12) qui commande la rotation autour de l'axe de polarisation (E-F) de 0 à 360 degrés; ladite première fourchette (15) est également articulée à ses extrémités à une seconde fourchette (17) disposée dans un plan perpendiculaire et dont la rotation est actionnée par un moteur motoréducteur (13) commandant l'axe d'élévation (A-B) de 0 à 90 degrés ; cette deuxième fourchette (17) est également commandée par un autre motoréducteur (14) qui règle la rotation de l'axe d'azimut (C-D) de 0 à 360 degrés ; cette axe d'azimut (C-D) est situé à la base de la seconde fourchette (17).Space-saving weather antenna according to claim 2 characterized in that
that the directional device of the directional antennas is actuated by three servomotors (12, 13 and 14); the set of antennas is integral with a first fork (15) supporting the four antennas (8, 9, 10, 11); this first fork supports the antennas (8, 9, 10, 11) at the periphery of a disc (16) or of a plate cross; this first fork (15) is controlled in rotation to rotate the disc (16) or plate cross by a servomotor or geared motor (12) which controls the rotation around the axis of polarization (EF) from 0 to 360 degrees; said first fork (15) is also articulated at its ends to a second fork (17) disposed in a perpendicular plane and the rotation of which is actuated by a geared motor (13) controlling the elevation axis (AB) from 0 to 90 degrees ; this second fork (17) is also controlled by another geared motor (14) which regulates the rotation of the azimuth axis (CD) from 0 to 360 degrees; this azimuth axis (CD) is located at the base of the second range (17). Antenne météorologique de faible encombrement, selon la revendication 1 caractérisée par le fait
   qu'elle est montée sur un dispositif autostabilisant, sur un plan horizontal ; ce dispositif est composé d'une fourchette (18) aux branches verticales (19, 20) ; cette fourchette (18) reçoit, à l'extrémité de ses branches verticales (19, 20) orientées vers le haut, un cercle articulé (21) qui est lui-même articulé selon un axe (X-Y) diamétralement opposé à la protection en plastique (7) qui forme la coupole ; l'ensemble des antennes directives (8, 9) et (10, 11) est solidaire de ce dispositif autostabilisant par la fourchette (17) qui est fixée par sa base (22) à la base de la fourchette (18) suivant un axe (23).Space-saving weather antenna according to claim 1 characterized in that
that it is mounted on a self-stabilizing device, on a horizontal plane; this device is composed of a fork (18) with vertical branches (19, 20); this fork (18) receives, at the end of its vertical branches (19, 20) oriented upwards, an articulated circle (21) which is itself articulated along an axis (XY) diametrically opposite to the plastic protection (7) which forms the dome; the set of directional antennas (8, 9) and (10, 11) is integral with this self-stabilizing device by the fork (17) which is fixed by its base (22) to the base of the fork (18) along an axis (23).
EP92480083A 1991-06-17 1992-06-16 Compact active antenna for weather satellite Withdrawn EP0519855A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9107503A FR2677813B1 (en) 1991-06-17 1991-06-17 LOW SIZE ACTIVE ANTENNA FOR METEOROLOGICAL SATELLITE.
FR9107503 1991-06-17

Publications (1)

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EP0519855A1 true EP0519855A1 (en) 1992-12-23

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EP92480083A Withdrawn EP0519855A1 (en) 1991-06-17 1992-06-16 Compact active antenna for weather satellite

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EP (1) EP0519855A1 (en)
FR (1) FR2677813B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1385231A1 (en) * 1996-09-26 2004-01-28 Texas Instruments Incorporated An antenna array

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2378368A1 (en) * 1977-01-21 1978-08-18 Dornier System Gmbh ANTENNA FOR SHIP
WO1983000952A1 (en) * 1982-03-26 1983-03-17 Grumman Corp An electronically scanned antenna system having a linear array of endfire elements
EP0142397A1 (en) * 1983-09-14 1985-05-22 Jean-Claude Le Gall Antenna stabilisation and aiming device, especially on a ship
GB2207557A (en) * 1987-06-01 1989-02-01 Leader Radio Co Ltd Antenna
FR2639479A1 (en) * 1989-04-25 1990-05-25 Sel Elettronica Soc Coop Arl Indoor aerial for receiving television signals

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2378368A1 (en) * 1977-01-21 1978-08-18 Dornier System Gmbh ANTENNA FOR SHIP
WO1983000952A1 (en) * 1982-03-26 1983-03-17 Grumman Corp An electronically scanned antenna system having a linear array of endfire elements
EP0142397A1 (en) * 1983-09-14 1985-05-22 Jean-Claude Le Gall Antenna stabilisation and aiming device, especially on a ship
GB2207557A (en) * 1987-06-01 1989-02-01 Leader Radio Co Ltd Antenna
FR2639479A1 (en) * 1989-04-25 1990-05-25 Sel Elettronica Soc Coop Arl Indoor aerial for receiving television signals

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ALTA FREQUENZA. vol. 46, no. 4, Avril 1977, MILANO IT pages 19192 - 194; PAMPALONI: 'A RING ARRAY OF YAGI-UDA ANTENNAS' *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1385231A1 (en) * 1996-09-26 2004-01-28 Texas Instruments Incorporated An antenna array

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FR2677813A1 (en) 1992-12-18
FR2677813B1 (en) 1994-01-07

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