EP0324769A1 - Cylindrical deployable sonar - Google Patents

Cylindrical deployable sonar

Info

Publication number
EP0324769A1
EP0324769A1 EP87906432A EP87906432A EP0324769A1 EP 0324769 A1 EP0324769 A1 EP 0324769A1 EP 87906432 A EP87906432 A EP 87906432A EP 87906432 A EP87906432 A EP 87906432A EP 0324769 A1 EP0324769 A1 EP 0324769A1
Authority
EP
European Patent Office
Prior art keywords
columns
sonar
arms
cardioids
cylindrical
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.)
Pending
Application number
EP87906432A
Other languages
German (de)
French (fr)
Inventor
Alain Lemer
Guy Riccardi
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.)
Thales SA
Original Assignee
Thomson CSF SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0324769A1 publication Critical patent/EP0324769A1/en
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/004—Mounting transducers, e.g. provided with mechanical moving or orienting device
    • G10K11/006—Transducer mounting in underwater equipment, e.g. sonobuoys
    • G10K11/008—Arrays of transducers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/80—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using ultrasonic, sonic or infrasonic waves
    • G01S3/801—Details

Definitions

  • the present invention relates to deployable cylindrical sonars which can be used, for example, from a helicopter.
  • the electronic processing of the signals received by the hydrophones of each arm makes it possible to locate the sources of noise, for example submarines.
  • the sources of noise for example submarines.
  • such a cylindrical arrangement necessarily transparent due to the structure of the device, is the source of a certain number of drawbacks, in particular ambiguities in detection and in location originating from the secondary lobes and the rear lobe of the various hydrophones. .
  • the invention proposes a deployable cylindrical sonar, of the type comprising a cylindrical body, a set of arms articulated on the body and each carrying a first column of transducers, the arms being able to fold against the body and deploy in placing the columns parallel to each other on the generatrices of a virtual cylindrical surface, and means for processing the signals from the transducers to form at least one transmission and / or reception channel, mainly characterized in that the arms each carry further a second column provided with transducers parallel to the first and located at a distance from the latter short in front of the operating wavelength of the sonar, which the processing means further comprise means for giving each pair of columns of each arms directivity in reception and / or transmission substantially cardioid oriented inward or outward, and that they also comprise means for selecting, in terms of channel formation, a part of the pairs of columns whose cardioids are oriented inward and the other part pairs of double columns, the cardioids of which are oriented towards the outside, thereby simulating two antennas, one con
  • the sonar comprises a body 1 held in a vertical position at the end of a cable 8 which makes it possible, for example, to descend it from a helicopter into the water.
  • a set of foldable arms 2 which are housed in the folded position in a set of housings 9 located longitudinally along the generatrices of the body 1.
  • Each arm 2 comprises two rods 3 fixed at one end by two articulations 5 on the body l.
  • a first vertical bar 4 is fixed to the other end of the rods 3 by articulations 6 so as to form with the rods 3 a deformable parallelogram situated in the vertical plane passing through the axis of symmetry of the buoy and such that it can fold against the body and unfold to a position where the rods 3 are horizontal and the bar vertical. At least one of the rods 3 extends beyond the articulation 6 to maintain a second bar 7 similar to the bar 4. In order to keep this bar 7 parallel to the bar, a spacer 10 is articulated on these two bars and located towards the end thereof opposite the joints 6. When the arms 2 are unfolded, the bars and 7 of these arms are arranged on two vertical cylindrical rings coaxial with the body 1.
  • a transparent circular sonar antenna is thus formed formed by columns of transducers since there is no obstacle to the sound waves between the columns.
  • the signals from the two columns of transducers of each arm are also processed by electronic means to obtain, for each of these pairs of columns, a diagram in the form of a cardioid in the horizontal plane.
  • This cardioid can, as the case may be, be oriented towards the outside of the circle like the cardioid 200 in solid lines, or towards the inside of the circle like the cardioid 300 in dotted lines.
  • the electronic equivalent is thus obtained for each pair of columns of an elementary antenna called baffled in one direction or the other, that is to say an antenna placed in front of a screen which obstructs reception. from the back and gives this directivity in cardioid.
  • the electronic processing used to obtain this directivity in the form of a cardioid can be obtained for example using the circuit shown in FIG. 3. If the two columns of the same arm are separated by a distance d, the signal received in the direction ⁇ with respect to the alignment of these two columns will be s c (t) for column 7 and s j Ct) for column 4.
  • the two signals s c (t) and if (t) are added in a first adder 30. They are phase-shifted by ITin two phase-shifters 40 and 50, and the signals thus phase-shifted are subtracted in a second adder 60.
  • the signal from the adder 60 is multiplied by a coefficient p in a multiplier 70 then the signal obtained is added in an adder 80 to the signal coming from the adder 30.
  • the equivalent of two semi-cylindrical baffled antennas oriented according to the desired channel is obtained, one being concave and the other convex, which considerably attenuates the disadvantages due to the transparency of the antenna structure by greatly reducing the level of the signal received on the rear.
  • each channel is formed by summing the signals from the hydrophones of each column providing the two signals s ⁇ Ct) and s c (t), then taking the signals corresponding to the cardioids oriented outwards (+ ô ) for all the pairs of columns situated on the same side with respect to a diameter perpendicular to the direction of the track, that is to say a half in the example described, and taking the signals corresponding to the inward-facing cardioids (- ⁇ ) for the other half.
  • the external cardioids are used for arms 1 to 8 and the internal cardioids for arms 9 to 16.
  • the external cardioids are used for arms 2 to 9 and inner cardioids for arms 10 to 1.
  • a sonar operating at 3.5 hz, it is possible to use an average diameter of the two column crowns of lm with a spacing d between these crowns of 7 cm, and a height of the columns of 60 cm.
  • the invention is not limited to the case where the columns are located in a ring since, in known manner, the formation of channels can be done by electronic means for columns arranged according to all kinds of curves such as ellipses or various polygons.
  • the sonar can be attached, in addition to a helicopter, to a surface building, or even form an acoustic buoy possibly recoverable.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Abstract

L'invention concerne les sonars munis d'une antenne acoustiquement transparente. Elle consiste, dans un sonar comportant des bras (2) déployables munis de colonnes (4) réparties sur une surface cylindrique, à doubler ces colonnes par des colonnes (7) situées à une petite distance des premières et à associer les signaux des hydrophones placés dans les colonnes de manière à obtenir pour chaque paire de colonnes une caractéristique cardioïde simulant une antenne bafflée. Elle permet d'éliminer le lobe arrière d'une antenne acoustiquement transparente.The invention relates to sonars provided with an acoustically transparent antenna. It consists, in a sonar comprising deployable arms (2) provided with columns (4) distributed over a cylindrical surface, doubling these columns by columns (7) located a short distance from the first ones and associating the signals of the hydrophones placed in the columns so as to obtain for each pair of columns a cardioid characteristic simulating a baffled antenna. It eliminates the rear lobe of an acoustically transparent antenna.

Description

SONAR CYLINDRIQUE DEPLOYABLE" DEPLOYABLE CYLINDRICAL SONAR "
La présente invention se rapporte aux sonars cylindriques déployables qui peuvent être utilisés par exemple à partir d'un hélicoptère.The present invention relates to deployable cylindrical sonars which can be used, for example, from a helicopter.
Il est connu du brevet français 2 35 920 de réaliser une bouée acoustique comportant sur un corps un ensemble de bras déployables munis d'hydrophones. Lorsque la bouée est larguée les bras sont repliés contre le corps, ce qui facilite sa pénétration dans l'eau et évite d'arracher ces bras. Lorsqu'elle est stabilisée dans l'eau à la profondeur voulue, les bras se déplient pour donner une base d'écoute cylindrique de diamètre nettement plus large que le corps de la bouée.It is known from French patent 2 35 920 to produce an acoustic buoy comprising on a body a set of deployable arms provided with hydrophones. When the buoy is released the arms are folded against the body, which facilitates its penetration into the water and avoids tearing off these arms. When it is stabilized in the water at the desired depth, the arms unfold to give a cylindrical listening base with a diameter much larger than the body of the buoy.
Le traitement électronique des signaux reçus par les hydrophones de chaque bras permet de localiser les sources de bruit, par exemple les sous-marins. Toutefois une telle disposition cylindrique, nécessairement transparente du fait de la structure du dispositif, est à l'origine d'un certain nombres d'inconvénients, en particulier des ambiguïtés en détection et en localisation provenant des lobes secondaires et du lobe arrière des différents hydrophones.The electronic processing of the signals received by the hydrophones of each arm makes it possible to locate the sources of noise, for example submarines. However, such a cylindrical arrangement, necessarily transparent due to the structure of the device, is the source of a certain number of drawbacks, in particular ambiguities in detection and in location originating from the secondary lobes and the rear lobe of the various hydrophones. .
Pour pallier ces inconvénients, l'invention propose un sonar cylindrique déployable, du type comprenant un corps cylindrique, un ensemble de bras articulés sur le corps et portant chacun une première colonne de transducteurs, les bras pouvant se replier contre le corps et se déployer en plaçant les colonnes parallèlement entre elles sur les génératrices d'une surface cylindrique virtuelle, et des moyens de traitement des signaux des transducteurs pour former au moins une voie d'émission et/ou de réception, principalement caractérisé en ce que les bras portent chacun outre une deuxième colonne munie de transducteurs parallèle à la première et située à une distance de celle-ci courte devant la longueur d'onde de fonctionnement du sonar, que les moyens de traitement comprennent en outre des moyens pour donner à chaque paires de colonnes de chaque bras une directivité en réception et/ou en émission sensiblement cardioîde orientée vers l'intérieur ou vers l'extérieur, et qu'ils comprennent également des moyens pour sélectionner au niveau de la formation de voies une partie des paires de colonnes dont les cardioîdes sont orientées vers l'intérieur et l'autre partie des paires de colonnes doubles dont les cardioîdes sont orientées vers l'extérieur en simulant ainsi deux antennes, l'une concave l'autre convexe, orientées dans la direction de chaque voie formée, toutes les paires de colonnes étant utilisées pour former chaque voie.To overcome these drawbacks, the invention proposes a deployable cylindrical sonar, of the type comprising a cylindrical body, a set of arms articulated on the body and each carrying a first column of transducers, the arms being able to fold against the body and deploy in placing the columns parallel to each other on the generatrices of a virtual cylindrical surface, and means for processing the signals from the transducers to form at least one transmission and / or reception channel, mainly characterized in that the arms each carry further a second column provided with transducers parallel to the first and located at a distance from the latter short in front of the operating wavelength of the sonar, which the processing means further comprise means for giving each pair of columns of each arms directivity in reception and / or transmission substantially cardioid oriented inward or outward, and that they also comprise means for selecting, in terms of channel formation, a part of the pairs of columns whose cardioids are oriented inward and the other part pairs of double columns, the cardioids of which are oriented towards the outside, thereby simulating two antennas, one concave and the other convex, oriented in the direction of each channel formed, all the pairs of columns being used to form each channel.
D'autres particularités et avantages de l'invention apparaîtront clairement dans la description suivante présentée à titre d'exemple non limitatif en regard des igures annexées qui représentent :Other features and advantages of the invention will appear clearly in the following description presented by way of nonlimiting example with reference to the appended figures which represent:
- la figure 1, une vue en perspective d'un sonar selon l'invention ;- Figure 1, a perspective view of a sonar according to the invention;
- la figure 2, un diagramme de positionnement des colonnes et 7 de la figure 1 ;- Figure 2, a positioning diagram of the columns and 7 of Figure 1;
- la figure 3, un schéma de circuit électronique des signaux provenant de ces colonnes.- Figure 3, an electronic circuit diagram of the signals from these columns.
Dans le mode de réalisation représenté sur la figure 1, le sonar comprend un corps 1 maintenu en position verticale au bout d'un câble 8 qui permet par exemple de le descendre depuis un hélicoptère jusque dans l'eau. Autour de ce corps sont disposés un ensemble de bras repliables 2 qui viennent se loger en position repliée dans un ensemble de logements 9 situés longitudinalement le long des génératrices du corps 1. Chaque bras 2 comprend deux tiges 3 fixées à une extrémité par deux articulations 5 sur le corps l. Un premier barreau vertical 4 est fixé à l'autre extrémité des tiges 3 par des articulations 6 de manière à former avec les tiges 3 un parallélogramme déformable situé dans le plan vertical passant par l'axe de symétrie de la bouée et tel qu'il peut se replier contre le corps et se déplier jusqu'à une position où les tiges 3 sont horizontales et le barreau vertical. L'une des tiges 3 au moins s'étend au-delà de l'articulation 6 pour maintenir un deuxième barreau 7 semblable au barreau 4. Afin de maintenir ce barreau 7 parallèle au barreau , on utilise par exemple une entretoise 10 articulée sur ces deux barreaux et située vers l'extrémité de ceux-ci opposée aux articulations 6. Lorsque les bras 2 sont dépliés, les barreaux et 7 de ces bras sont disposés sur deux couronnes cylindriques verticales coaxiales au corps 1.In the embodiment shown in FIG. 1, the sonar comprises a body 1 held in a vertical position at the end of a cable 8 which makes it possible, for example, to descend it from a helicopter into the water. Around this body are arranged a set of foldable arms 2 which are housed in the folded position in a set of housings 9 located longitudinally along the generatrices of the body 1. Each arm 2 comprises two rods 3 fixed at one end by two articulations 5 on the body l. A first vertical bar 4 is fixed to the other end of the rods 3 by articulations 6 so as to form with the rods 3 a deformable parallelogram situated in the vertical plane passing through the axis of symmetry of the buoy and such that it can fold against the body and unfold to a position where the rods 3 are horizontal and the bar vertical. At least one of the rods 3 extends beyond the articulation 6 to maintain a second bar 7 similar to the bar 4. In order to keep this bar 7 parallel to the bar, a spacer 10 is articulated on these two bars and located towards the end thereof opposite the joints 6. When the arms 2 are unfolded, the bars and 7 of these arms are arranged on two vertical cylindrical rings coaxial with the body 1.
En munissant alors les barreaux verticaux de transducteurs, on constitue ainsi une antenne sonar circulaire transparente formée de colonnes de transducteurs puisqu'il n'y a pas d'obstacle aux ondes sonores entre les colonnes .By then providing the vertical bars with transducers, a transparent circular sonar antenna is thus formed formed by columns of transducers since there is no obstacle to the sound waves between the columns.
Dans un plan horizontal les barreaux sont regroupés selon deux cercles concentriques comme représenté sur la figure 2 dans le cas de 16 bras.In a horizontal plane the bars are grouped in two concentric circles as shown in Figure 2 in the case of 16 arms.
Il est connu de traiter les signaux provenant des transducteurs par des moyens électroniques, contenus par exemple dans le corps 1, pour obtenir dans le plan horizontal des directions privilégiées, appelées voies, d'émission ou de réception. Sur la figure 2 on a par exemple représenté les direction des voies V^ et V5.It is known to process the signals coming from the transducers by electronic means, contained for example in the body 1, in order to obtain in the horizontal plane privileged directions, called channels, of emission or reception. In Figure 2 we have for example shown the direction of the channels V ^ and V5.
Selon l'invention, on traite également par des moyens électroniques les signaux des deux colonnes de transducteurs de chaque bras pour obtenir pour chacune de ces paires de colonnes un diagramme en forme de cardioîde dans le plan horizontal. Cette cardioîde peut être selon le cas orientée vers l'extérieur du cercle comme la cardioîde 200 en traits pleins, ou vers l'intérieur du cercle comme la cardioîde 300 en traits pointillés. On obtient ainsi pour chacune des paires de colonnes l'équivalent électronique d'une antenne élémentaire dite bafflée dans un sens ou dans l'autre, c'est-à-dire d'une antenne placée devant un écran qui fait obstacle à la réception par l'arrière et donne cette directivité en cardioîde.According to the invention, the signals from the two columns of transducers of each arm are also processed by electronic means to obtain, for each of these pairs of columns, a diagram in the form of a cardioid in the horizontal plane. This cardioid can, as the case may be, be oriented towards the outside of the circle like the cardioid 200 in solid lines, or towards the inside of the circle like the cardioid 300 in dotted lines. The electronic equivalent is thus obtained for each pair of columns of an elementary antenna called baffled in one direction or the other, that is to say an antenna placed in front of a screen which obstructs reception. from the back and gives this directivity in cardioid.
Le traitement électronique utilisé pour obtenir cette directivité en forme de cardioîde peut être obtenu par exemple à l'aide du circuit représenté sur la figure 3. Si les deux colonnes d'un même bras sont séparées d'une distance d, le signal reçu dans la direction θ par rapport à l'alignement de ces deux colonnes sera sc(t) pour la colonne 7 et sjCt) pour la colonne 4.The electronic processing used to obtain this directivity in the form of a cardioid can be obtained for example using the circuit shown in FIG. 3. If the two columns of the same arm are separated by a distance d, the signal received in the direction θ with respect to the alignment of these two columns will be s c (t) for column 7 and s j Ct) for column 4.
Les deux signaux sc(t) et si(t) sont additionnés dans un premier additionneur 30. Ils sont déphasés de ITdans deux déphaseurs 40 et 50, et les signaux ainsi déphasés sont soustraits dans un deuxième additionneur 60. Le signal de l'additionneur 60 est multiplié par un coefficient p dans un multiplicateur 70 puis le signal obtenu est additionné dans un additionneur 80 au signal provenant de l'additionneur 30.The two signals s c (t) and if (t) are added in a first adder 30. They are phase-shifted by ITin two phase-shifters 40 and 50, and the signals thus phase-shifted are subtracted in a second adder 60. The signal from the adder 60 is multiplied by a coefficient p in a multiplier 70 then the signal obtained is added in an adder 80 to the signal coming from the adder 30.
Si A cos ujt est le signal reçu, le signal x(t) résultant délivréIf A cos ujt is the received signal, the resulting signal x (t) delivered
Si d est petit devantΛ» la formule se réduit à : x (t) = 2A cos jt (1 + cos θ ) On constate donc que plus d est petit, plus on se rapproche de la forme d'une cardioîde. On est toutefois limité par la sensibilité aux dispersions sur les caractérisques des transducteurs, qui augmente avec la valeur du coefficient β.If d is small in front of Λ ”the formula reduces to: x (t) = 2A cos jt (1 + cos θ) We therefore observe that the smaller d is, the closer we get to the shape of a cardioid. However, it is limited by the sensitivity to dispersions on the characteristics of the transducers, which increases with the value of the coefficient β.
Il est connu de former une voie pointée dans une direction donnée en retardant (ou déphasant) les signaux des capteurs d'une antenne d'une valeur correspondant à la remise en phase des signaux suivant cette direction, puis en les sommant.It is known to form a path pointed in a given direction by delaying (or phase shifting) the signals from the sensors of an antenna by a value corresponding to the reshaping of the signals along this direction, then by summing them.
En associant alors de manière convenable les signaux ainsi traités pour toutes les paires de colonnes, on obtient l'équivalent de deux antennes bafflées demi-cylindriques orientées selon la voie désirée, l'une étant concave et l'autre convexe, ce qui atténue considérablement les inconvénients dus à la transparence de la structure de l'antenne en réduisant fortement le niveau du signal reçu sur l'arrière.By then suitably associating the signals thus processed for all the pairs of columns, the equivalent of two semi-cylindrical baffled antennas oriented according to the desired channel is obtained, one being concave and the other convex, which considerably attenuates the disadvantages due to the transparency of the antenna structure by greatly reducing the level of the signal received on the rear.
Pour cela selon l'invention on forme chaque voie en sommant les signaux des hydrophones de chaque colonne fournissant les deux signaux s^Ct) et sc(t), puis en prenant les signaux correspondant aux cardioîdes orientées vers l'extérieur (+ô ) pour toutes les paires de colonnes situées du même côté par rapport à un diamètre perpendiculaire à la direction de la voie, c'est-à-dire une moitié dans l'exemple décrit, et en prenant les signaux correspondant aux cardioîdes orientées vers l'intérieur (-β) pour l'autre moitié.For this according to the invention, each channel is formed by summing the signals from the hydrophones of each column providing the two signals s ^ Ct) and s c (t), then taking the signals corresponding to the cardioids oriented outwards (+ ô ) for all the pairs of columns situated on the same side with respect to a diameter perpendicular to the direction of the track, that is to say a half in the example described, and taking the signals corresponding to the inward-facing cardioids (-β) for the other half.
Ceci est obtenu simplement au moyen d'un dispositif de sélection au niveau du circuit 70.This is obtained simply by means of a selection device at the level of circuit 70.
A titre d'exemple, sur la figure 2 pour obtenir la voie Vit on utilise les cardioîdes extérieures pour les bras 1 à 8 et les cardioîdes intérieures pour les bras 9 à 16. De même, pour la voie V5 on utilise les cardioîdes extérieures pour les bras 2 à 9 et les cardioîdes intérieures pour les bras 10 à 1.By way of example, in FIG. 2, to obtain the Vit channel, the external cardioids are used for arms 1 to 8 and the internal cardioids for arms 9 to 16. Similarly, for channel V5, the external cardioids are used for arms 2 to 9 and inner cardioids for arms 10 to 1.
En ce qui concerne la directivité en site du sonar, qui est liée à la dimension en longueur des colonnes 4 et 7, on peut l'améliorer sensiblement en pondérant de manière connue la répartition spatiale des transducteurs élémentaires à l'intérieur de chacune des colonnes. De manière également connue on peut remplacer cette pondération spatiale par une pondération électronique des transducteurs qui sont alors régulièrement espacés dans le barreau.As regards the directivity in site of the sonar, which is linked to the length dimension of columns 4 and 7, it can be improved considerably by weighting in known manner the spatial distribution of the elementary transducers inside each of the columns. . In a manner also known, this spatial weighting can be replaced by an electronic weighting of the transducers which are then regularly spaced in the bar.
A titre d'exemple de réalisation numérique, pour un sonar fonctionnant à 3, 5 hz on peut utiliser un diamètre moyen des deux couronnes de colonnes de lm avec un espacement d entre ces couronnes de 7cm, et une hauteur des colonnes de 60cm. L'invention n'est pas limitée au cas où les colonnes sont situées selon une couronne puisque, de manière connue, la formation de voies peut se faire par des moyens électroniques pour des colonnes disposées selon toutes sortes de courbes telles que des ellipses ou des polygones divers. De même le sonar peut être accroché, outre à un hélicoptère, à un bâtiment de surface, ou même former une bouée acoustique éventuellement récupérable. As an example of a digital embodiment, for a sonar operating at 3.5 hz, it is possible to use an average diameter of the two column crowns of lm with a spacing d between these crowns of 7 cm, and a height of the columns of 60 cm. The invention is not limited to the case where the columns are located in a ring since, in known manner, the formation of channels can be done by electronic means for columns arranged according to all kinds of curves such as ellipses or various polygons. Similarly, the sonar can be attached, in addition to a helicopter, to a surface building, or even form an acoustic buoy possibly recoverable.

Claims

REVENDICATIONS
1. Sonar cylindrique déployable, du type comprenant un corps cylindrique (1), un ensemble de bras (2) articulés sur le corps et portant chacun une première colonne (4) de transducteurs, les bras pouvant se replier contre le corps et se déployer en plaçant les colonnes parallèlement entre elles sur les génératrices d'une surface cylindrique virtuelle, et des moyens de traitement des signaux des hydrophones pour former au moins une voie (V^) d'émission et/ou de réception, caractérisé en ce que les bras (2) portent chacun en outre une deuxième colonne (7) munie de transducteurs parallèle à la première (4) et située à une distance de celle-ci courte devant la longueur d'onde de fonctionnement du sonar, que les moyens de traitement comprennent en outre des moyens pour donner à chaque paire de colonnes de chaque bras une directivité en réception et/ou en émission sensiblement cardioîde orientée vers l'intérieur (200) ou vers l'extérieur (300) , et qu'ils comprennent également des moyens pour sélectionner au niveau de la formation de voies une partie des paires de colonnes doubles dont les cardioîdes sont orientées vers l'intérieur et l'autre partie des paires de colonnes doubles dont les cardioîdes sont orientées vers l'extérieur en simulant ainsi deux antennes, l'une concave l'autre convexe, orientées dans la direction de chaque voie formée, toutes les paires de colonnes étant utilisées pour former chaque voie.1. Deployable cylindrical sonar, of the type comprising a cylindrical body (1), a set of arms (2) articulated on the body and each carrying a first column (4) of transducers, the arms being able to fold against the body and deploy by placing the columns parallel to each other on the generatrices of a virtual cylindrical surface, and means for processing the hydrophone signals to form at least one transmission and / or reception channel (V ^), characterized in that the arms (2) each further carry a second column (7) provided with transducers parallel to the first (4) and located at a distance from the latter short in front of the operating wavelength of the sonar, than the processing means further include means for giving each pair of columns of each arm directivity in reception and / or transmission substantially cardioid oriented inward (200) or outward (300), and that they comprise also means for selecting, in terms of channel formation, a part of the pairs of double columns whose cardioids are oriented inwards and the other part of the pairs of double columns whose cardioids are oriented towards the outside thereby simulating two antennas, one concave the other convex, oriented in the direction of each channel formed, all pairs of columns being used to form each channel.
2. Sonar selon la revendication 1, caractérisé en ce que les colonnes (4, 7) sont régulièrement réparties en position déployée sur deux surfaces cylindriques à bases circulaires coaxiales et que les moyens de traitement sélectionnent pour chaque voie formée respectivement les cardioîdes situées d'un côté d'un plan diamétral du cylindre perpendiculaire à la direction de la voie (Vψ) et les cardioîdes situés de l'autre côté de ce plan diamétral. 2. Sonar according to claim 1, characterized in that the columns (4, 7) are regularly distributed in the deployed position on two cylindrical surfaces with circular coaxial bases and that the processing means select for each path formed respectively the cardioids located one side of a diametral plane of the cylinder perpendicular to the direction of the track (Vψ) and the cardioids located on the other side of this diametral plane.
EP87906432A 1986-09-26 1987-09-25 Cylindrical deployable sonar Pending EP0324769A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8613485A FR2604530B1 (en) 1986-09-26 1986-09-26 DEPLOYABLE CYLINDRICAL SONAR
FR8613485 1986-09-26

Publications (1)

Publication Number Publication Date
EP0324769A1 true EP0324769A1 (en) 1989-07-26

Family

ID=9339318

Family Applications (2)

Application Number Title Priority Date Filing Date
EP87906432A Pending EP0324769A1 (en) 1986-09-26 1987-09-25 Cylindrical deployable sonar
EP87402148A Expired - Lifetime EP0264320B1 (en) 1986-09-26 1987-09-25 Deployable cylindrical sonar array

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP87402148A Expired - Lifetime EP0264320B1 (en) 1986-09-26 1987-09-25 Deployable cylindrical sonar array

Country Status (8)

Country Link
US (1) US5319612A (en)
EP (2) EP0324769A1 (en)
CA (1) CA1280504C (en)
DE (1) DE3772508D1 (en)
ES (1) ES2024534B3 (en)
FR (1) FR2604530B1 (en)
SG (1) SG112293G (en)
WO (1) WO1988002535A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT8867861A0 (en) * 1987-10-02 1988-09-28 Thomson Csf DEPLOYABLE CYLINDRICAL SONAR
FR2685848B1 (en) * 1991-12-26 1994-02-25 Thomson Csf LINEAR ACOUSTIC ANTENNA.
FR2751425B1 (en) * 1996-07-19 1998-08-28 Thomson Marconi Sonar Sas METHOD AND DEVICE FOR HELIPORTED FIGHT AGAINST UNDERWATER MINES
GB2414800B (en) * 2000-01-27 2006-05-31 Thomson Marconi Sonar Ltd Sonar receiver with low side lobes
FR2818081B1 (en) * 2000-12-08 2003-04-11 Thomson Marconi Sonar Sas HULL SONAR FOR NAVAL BUILDING
FR3015785B1 (en) 2013-12-20 2015-12-25 Thales Sa COMPACT OMNIDIRECTIONAL ANTENNA FOR SONAR TEMP

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE702103C (en) * 1938-04-01 1941-01-30 Electroacustic Gmbh Device for unidirectional transmission of a sound beam limited on all sides
US3665380A (en) * 1970-06-18 1972-05-23 Collins Radio Co Electronic aids for aquanauts
US3931607A (en) * 1972-01-12 1976-01-06 The United States Of America As Represented By The Secretary Of The Navy Array transducer angular tracking system
US3886491A (en) * 1973-09-12 1975-05-27 Bendix Corp Expandable sonar array
GB2093996B (en) * 1980-05-03 1984-03-21 Plessey Co Ltd Improvements in or relating to sonar arrays
US4661938A (en) * 1986-01-23 1987-04-28 Westinghouse Electric Corp. Sonar apparatus
FR2638258B1 (en) * 1988-10-21 1991-10-31 Thomson Csf ARTICULATED ARM MECHANISM AND SONAR ANTENNA EQUIPPED WITH SUCH A MECHANISM

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8802535A1 *

Also Published As

Publication number Publication date
DE3772508D1 (en) 1991-10-02
SG112293G (en) 1994-01-21
FR2604530A1 (en) 1988-04-01
EP0264320B1 (en) 1991-08-28
EP0264320A1 (en) 1988-04-20
WO1988002535A1 (en) 1988-04-07
ES2024534B3 (en) 1992-03-01
US5319612A (en) 1994-06-07
CA1280504C (en) 1991-02-19
FR2604530B1 (en) 1988-12-09

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