EP0227950A2 - Method of producing a radar reflector - Google Patents

Method of producing a radar reflector Download PDF

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Publication number
EP0227950A2
EP0227950A2 EP86116349A EP86116349A EP0227950A2 EP 0227950 A2 EP0227950 A2 EP 0227950A2 EP 86116349 A EP86116349 A EP 86116349A EP 86116349 A EP86116349 A EP 86116349A EP 0227950 A2 EP0227950 A2 EP 0227950A2
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EP
European Patent Office
Prior art keywords
spherical
radar
radar reflector
reflecting
reflector
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EP86116349A
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German (de)
French (fr)
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EP0227950A3 (en
Inventor
Marlène Schäfer geb. Laval
Wilhelm Schuster
Jürgen Stahl
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LAVAL, MARLENE
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Laval Marlene
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Publication of EP0227950A2 publication Critical patent/EP0227950A2/en
Publication of EP0227950A3 publication Critical patent/EP0227950A3/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H01Q15/141—Apparatus or processes specially adapted for manufacturing reflecting surfaces
    • H01Q15/142—Apparatus or processes specially adapted for manufacturing reflecting surfaces using insulating material for supporting the reflecting surface
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H01Q15/18—Reflecting surfaces; Equivalent structures comprising plurality of mutually inclined plane surfaces, e.g. corner reflector

Definitions

  • the invention relates to a method for producing a T ripelLite containing, spherical, of uniform spherical composite-eighths radar reflector, wherein the ball-eighth made from foam whose mutually contacting flat surfaces are reflective.
  • Radar reflectors are important markings, especially on maritime and maritime roads, where they provide clear illuminated signs for safety in boat and shipping traffic.
  • radar reflectors Numerous embodiments of radar reflectors have been proposed and become known, but only a few work reasonably satisfactorily. For a good reflector effect, it is particularly important to maintain the right angles of the surfaces in corners and perfect reflector surfaces. However, precisely these features leave something to be desired in the known radar reflectors and have defects.
  • a ball has proven to be the most suitable form of a reflector body, which also influences the reflection properties.
  • DE-PS 23 08 701 describes a method for producing a spherical radar reflector, in which a rigid foam ball is divided into uniform spherical eighths, ie is cut. The resulting flat cut surfaces are made with reflector plates Mistake. When such a rigid foam ball is cut, pores of the foam are inevitably opened at the cut surfaces, as a result of which the properties of the surface are changed and the reflection is thereby impaired. In addition, when a ball is cut into a ball-eight, it is not guaranteed with certainty that the angular position of the reflecting flat surfaces is always exactly maintained.
  • the object of the invention was to provide a method for producing a radar reflector which makes it possible to create a reflector body of the type mentioned at the outset, in which the reflecting flat surfaces of the spherical eight are in each case arranged in an exact angular position with respect to one another and also have smooth surfaces that can be properly and permanently covered with reflector material.
  • each individual spherical eight part is foamed in a corresponding shape with smooth surfaces on all sides and, after the foaming out, material reflecting radar beams is connected to the plane surfaces.
  • the spherical eight can be manufactured with different densities, so that by choosing appropriate spherical eight a weight distribution can take place, which gives the radar reflector the necessary stability while at the same time being as light as possible. A large force acts on the fastening elements, which are generally located at the bottom, and therefore these elements must be particularly strong. On the other hand, the total weight of the reflector body should be light enough to avoid top heaviness. In the separate manufacture of the spherical eight, the density of each spherical eight can be selected accordingly, so that heavier spherical eight can be used for the fastening elements than for the remaining spherical eight.
  • Radar reflectors manufactured according to the invention can therefore be stably attached even at the highest points of boats and ships.
  • the manufacturing method according to the invention ensures the highest precision and durability for the right angles of the mirror surface which are essential for the function of the triple mirror.
  • an outer shell suitably consists of glass fiber reinforced polyester and thus corresponds to the material from which seawater-resistant yachts, pleasure boats and closed lifeboats are made.
  • Each spherical box 1, 2, 3, 4 is manufactured by foaming in standardized forms, whereby it is ensured that all demolded spherical boxes are identical.
  • the three flat surfaces 5, 6, 7 (FIG. 1) of a spherical box 1 serve as a base for the material reflecting the radar rays and result in a triple mirror arrangement.
  • the radar beam reflecting material can be a thin metal foil which lies closely against the contacting plane surface 6/6 'of two neighboring spherical quarters 1/2.
  • a preferred material consists of an adhesive in which particles of a metal reflecting radar rays are evenly distributed.
  • the mixture of adhesive and metal particles is applied to a flat surface 6 of a spherical eight 1 and the adjacent spherical eight 2 with its corresponding flat surface 6 'is applied to the Flat surface 6 of the first spherical eight 1 pressed.
  • the adhesive thus serves as a carrier for the reflective particles and at the same time as a binder by means of which the reflective plane surfaces of adjacent spherical eight are connected to one another.
  • a conductive material in the form of microfine particles is added to the mixture of adhesive and reflective metal particles.
  • Such a material which is finely distributed in the submicron range, is sufficient in extremely small quantities to generate an almost complete conductivity in the reflective layer applied to the flat surfaces.
  • the micro-fine structure of the additionally incorporated electrically conductive material for example conductive carbon black, bridges any gaps that may occur between metal particles, so that a desired uninterrupted conductivity is achieved.
  • Aluminum powder in platelet form for example, is suitable as the metal particle.

Abstract

Es wird ein Verfahren zur Herstellung eines Tripelspiegel enthaltenden, kugelförmigen, aus gleichförmigen Kugelachteln zusammengesetzten Radarreflektors beschrieben. Die Kugelachtel bestehen aus Schaumstoff, deren einander berührende Planflächen reflektierend ausgebildet sind. Die Kugelachtel werden einzeln in entsprechenden Formen ausgeschäumt und die Planflächen der Kugelachtel werden mit Radarstrahlen reflektierendem Material belegt. Dieses Material kann aus Metallfolien bestehen oder ein Gemisch aus einem Kleber und darin gleichmässig verteilten Metallpartikeln sein.A method for producing a spherical radar reflector comprising triple mirrors is described. The spherical eight are made of foam, the contacting plane surfaces of which are reflective. The spherical eight are individually foamed in appropriate shapes and the flat surfaces of the spherical eight are covered with material reflecting radar rays. This material can consist of metal foils or be a mixture of an adhesive and evenly distributed metal particles therein.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung eines Tripelspiegel enthaltenden, kugelförmigen, aus gleichförmigen Kugelachteln zusammengesetzten Radarreflektors, wobei die Kugelachtel aus Schaumstoff bestehen, deren einander berührende Planflächen reflektierend ausgebildet sind.The invention relates to a method for producing a T ripelspiegel containing, spherical, of uniform spherical composite-eighths radar reflector, wherein the ball-eighth made from foam whose mutually contacting flat surfaces are reflective.

Radarreflektoren sind wichtige Markierungen, insbesondere auf Seeschiffahrts- und Seestrassen, wo sie als weithin sichtbare deutliche Leuchtzeichen für Sicherheit im Boots- und Schiffahrtsverkehr sorgen.Radar reflectors are important markings, especially on maritime and maritime roads, where they provide clear illuminated signs for safety in boat and shipping traffic.

Es sind zahlreiche Ausführungsformen von Radarreflektoren vorgeschlagen und bekannt geworden, aber nur wenige arbeiten einigermassen zufriedenstellend. Für eine gute Reflektorwirkung ist insbesondere eine exakte Einhaltung der rechten Winkel der in Ecken zueinanderstehenden Flächen sowie einwandfreie Reflektorflächen von Bedeutung. Gerade diese Merkmale lassen aber bei den bekannten Radarreflektoren zu wünschen übrig und weisen Mängel auf. Als am besten geeignete Form eines Reflektorkörpers, die die Reflektionseigenschaften ebenfalls beeinflusst, hat sich eine Kugel erwiesen.Numerous embodiments of radar reflectors have been proposed and become known, but only a few work reasonably satisfactorily. For a good reflector effect, it is particularly important to maintain the right angles of the surfaces in corners and perfect reflector surfaces. However, precisely these features leave something to be desired in the known radar reflectors and have defects. A ball has proven to be the most suitable form of a reflector body, which also influences the reflection properties.

Die DE-PS 23 08 701 beschreibt ein Verfahren zur Herstellung eines kugelförmigen Radarreflektors, bei dem eine Hartschaumkugel in gleichförmige Kugelachtel geteilt, d.h. zerschnitten wird. Die dabei entstehenden ebenen Schnittflächen werden mit Reflektorblechen versehen. Beim Zerschneiden einer solchen Hartschaumkugel werden aber unweigerlich an den Schnittflächen Poren des Schaumstoffs geöffnet, wodurch die Eigenschaften der Oberfläche verändert und damit die Reflektion beeinträchtigt wird. Hinzu kommt, dass beim Zerschneiden einer Kugel in Kugelachtel nicht mit Sicherheit gewährleistet ist, dass die Winkelstellung der reflektierenden Planflächen immer exakt eingehalten ist.DE-PS 23 08 701 describes a method for producing a spherical radar reflector, in which a rigid foam ball is divided into uniform spherical eighths, ie is cut. The resulting flat cut surfaces are made with reflector plates Mistake. When such a rigid foam ball is cut, pores of the foam are inevitably opened at the cut surfaces, as a result of which the properties of the surface are changed and the reflection is thereby impaired. In addition, when a ball is cut into a ball-eight, it is not guaranteed with certainty that the angular position of the reflecting flat surfaces is always exactly maintained.

Aufgabe der Erfindung war es, ein Verfahren zur Herstellung eines Radarreflektors zu schaffen, das es ermöglicht, einen Reflektorkörper der eingangs genannten Art zu schaffen, bei dem die reflektierenden Planflächen der Kugelachtel in jedem Fall in einer exakten Winkelstellung zueinander angeordnet sind und ferner glatte Oberflächen aufweisen, die einwandfrei und dauerhaft mit Reflektormaterial belegt werden können.The object of the invention was to provide a method for producing a radar reflector which makes it possible to create a reflector body of the type mentioned at the outset, in which the reflecting flat surfaces of the spherical eight are in each case arranged in an exact angular position with respect to one another and also have smooth surfaces that can be properly and permanently covered with reflector material.

Diese Aufgabe wird durch ein Verfahren der eingangs genannten Art dadurch gelöst, dass jedes einzelne Kugelachtelteil in einer entsprechenden Form mit allseitig glatten Oberflächen ausgeschäumt wird und nach dem Ausschäumen Radarstrahlen reflektierendes Material mit den Planflächen verbunden wird.This object is achieved by a method of the type mentioned at the outset in that each individual spherical eight part is foamed in a corresponding shape with smooth surfaces on all sides and, after the foaming out, material reflecting radar beams is connected to the plane surfaces.

Zweckmässige Weiterbildungen des Verfahrens sowie bevorzugte Ausführungsformen des Radarreflektors sind in den Unteransprüchen gekennzeichnet.Appropriate developments of the method and preferred embodiments of the radar reflector are characterized in the subclaims.

Durch das Ausschäumen der einzelnen Kugelachtel in Formen ist eine äusserst genaue Formgebung der Teile mit glatten Oberflächen gewährleistet. Bei der Einzelstückherstellung ist sichergestellt, dass die Winkelstellung eines jeden Kugelachtels immer genauestens eingehalten wird. Hinzu kommt, dass beim Ausschäumen in Formen ein Aufreissen der Poren, wie es beim Zerschneiden eines Schaumstoffes nicht zu vermeiden ist, ausgeschlossen ist. So hergestellte glatte Oberflächen müssen nicht mit Reflektorblechen belegt werden. Es können vielmehr reflektierende Streichmassen oder Metallfolien verwendet werden. Auf diese Weise bestückte Reflektorflächen garantieren eine optimale Wirkung und erfüllen die an Radarreflektoren gestellten Anforderungen in hohem Maße. Sie sind ohne Mühe auch in einer Entfernung von den geforderten 4,3 Seemeilen sichtbar. Hinzu kommt, dass die Kugelachtel mit unterschiedlichen Raumgewichten hergestellt werden können, so dass durch Wahl entsprechender Kugelachtel eine Gewichtsverteilung erfolgen kann, die dem Radarreflektor die nötige Stabilität bei gleichzeitig möglichst geringem Gewicht verleiht. Auf den in der Regel unten befindlichen Befestigungselementen wirkt eine grosse Kraft und daher müssen diese Elemente besonders fest sein. Andererseits soll aber das Gesamtgewicht des Reflektorkörpers ausreichend leicht sein, um Kopflastigkeit zu vermeiden. Bei der gesonderten Herstellung der Kugelachtel kann das Raumgewicht eines jeden Kugelachtels entsprechend gewählt werden, so dass für die Befestigungselemente schwerere Kugelachtel verwendet werden können als für die übrigen Kugelachtel. Auf diese Weise können die beiden für einen Reflektorkörper gewünschten Eigenschaften, nämlich Festigkeit und Leichtigkeit ohne Schwierigkeiten und ohne wirtschaftliche Mehrbelastung kombiniert werden. Erfindungsgemäss hergestellte Radarreflektoren können daher auch an höchsten Stellen von Booten und Schiffen stabil angebracht werden. Das erfindungsgemässe Fertigungsverfahren gewährleistet für die für die Funktion der Tripelspiegel wesentlichen rechten Winkel der Spiegelfläche höchste Präzision und Dauerbeständigkeit. Damit ist eine volle Funktionsfähigkeit auch dann garantiert, wenn der Reflektorkörper Stoss- und Erschütterungsbeanspruchungen ausgesetzt ist, die so stark sind, dass selbst eine Aussenhülle des Körpers beschädigt würde. Eine solche Aussenhüllebesteht zweckmässig aus glasfaserverstärktem Polyester und entspricht damit dem Material, aus dem seewasserfeste Jachten, Sportboote und geschlossene Rettungsboote hergestellt werden.By foaming the individual spherical eight in molds, an extremely precise shaping of the parts with smooth surfaces is guaranteed. When manufacturing individual pieces, it is ensured that the angular position of each spherical eight is always maintained exactly. In addition, when foaming In molds, opening of the pores, which cannot be avoided when cutting a foam, is impossible. Smooth surfaces produced in this way do not have to be covered with reflector sheets. Rather, reflective coating slips or metal foils can be used. Reflector surfaces equipped in this way guarantee an optimal effect and meet the requirements placed on radar reflectors to a high degree. They are easily visible even at a distance of the required 4.3 nautical miles. In addition, the spherical eight can be manufactured with different densities, so that by choosing appropriate spherical eight a weight distribution can take place, which gives the radar reflector the necessary stability while at the same time being as light as possible. A large force acts on the fastening elements, which are generally located at the bottom, and therefore these elements must be particularly strong. On the other hand, the total weight of the reflector body should be light enough to avoid top heaviness. In the separate manufacture of the spherical eight, the density of each spherical eight can be selected accordingly, so that heavier spherical eight can be used for the fastening elements than for the remaining spherical eight. In this way, the two properties desired for a reflector body, namely strength and lightness, can be combined without difficulty and without additional economic burden. Radar reflectors manufactured according to the invention can therefore be stably attached even at the highest points of boats and ships. The manufacturing method according to the invention ensures the highest precision and durability for the right angles of the mirror surface which are essential for the function of the triple mirror. In order to full functionality is guaranteed even if the reflector body is exposed to shock and vibration stresses that are so strong that even an outer shell of the body would be damaged. Such an outer shell suitably consists of glass fiber reinforced polyester and thus corresponds to the material from which seawater-resistant yachts, pleasure boats and closed lifeboats are made.

Die Zeichnungen zeigen in

  • Fig. 1 eine perspektivische Ansicht eines Kugelachtels, in Richtung auf dessen Spitze gesehen; und
  • Fig. 2 eine Draufsicht auf die Kreisfläche einer Kugelhälfte des Radarreflektors mit vier aneinanderstossenden Kreisausschnitten.
The drawings show in
  • Figure 1 is a perspective view of a spherical box, seen in the direction of its tip. and
  • Fig. 2 is a plan view of the circular area of a ball half of the radar reflector with four abutting circular sections.

Jedes Kugelachtel 1, 2, 3, 4 wird durch Ausschämen in genormten Formen hergestellt, wobei sichergestellt ist, dass alle entformten Kugelachtel identisch sind. Die drei Planflächen 5, 6, 7 (Fig. 1) eines Kugelachtels 1 dienen als Unterlage für das Radarstrahlen reflektierende Material und ergeben eine Tripelspiegelanordnung.Each spherical box 1, 2, 3, 4 is manufactured by foaming in standardized forms, whereby it is ensured that all demolded spherical boxes are identical. The three flat surfaces 5, 6, 7 (FIG. 1) of a spherical box 1 serve as a base for the material reflecting the radar rays and result in a triple mirror arrangement.

Das Radarstrahlen reflektierende Material kann eine dünne Metallfolie sein, die eng an den einander berührenden Planfläche 6/6' zweier benachbarter Kugelachtel 1/2 anliegen.The radar beam reflecting material can be a thin metal foil which lies closely against the contacting plane surface 6/6 'of two neighboring spherical quarters 1/2.

Ein bevorzugtes Material besteht aus einem Kleber, in dem Partikel eines Radarstrahlen reflektierenden Metalls gleichmässig verteilt sind. Das Gemisch aus Kleber und Metallpartikel wird auf eine Planfläche 6 eines Kugelachtels 1 aufgetragen und das benachbarte Kugelachtel 2 wird mit seiner entsprechenden Planfläche 6' an die Planfläche 6 des ersten Kugelachtels 1 angedrückt.A preferred material consists of an adhesive in which particles of a metal reflecting radar rays are evenly distributed. The mixture of adhesive and metal particles is applied to a flat surface 6 of a spherical eight 1 and the adjacent spherical eight 2 with its corresponding flat surface 6 'is applied to the Flat surface 6 of the first spherical eight 1 pressed.

Der Kleber dient somit als Träger für die reflektierenden Partikel und gleichzeitig als Bindemittel, durch das die reflektierenden Planflächen benachbarter Kugelachtel miteinander verbunden werden. Zur Optimierung der reflektierenden Wirkung wird dem Gemisch aus Kleber und reflektierenden Metallpartikeln noch ein leitfähiges Material in Form von mikrofeinen Partikeln zugegeben. Ein solches im Submikronbereich fein verteiltes Material genügt in äusserst geringen Mengen, um in der auf die Planflächen aufgebrachte reflektierende Schicht eine nahezu vollständige Leitfähigkeit zu erzeugen. Durch die mikrofeine Struktur des zusätzlich einverleibten elektrisch leitenden Materials, beispielsweise Leitruss, werden eventuell auftretende Zwischenräume zwischen Metallpartikeln überbrückt, so dass eine gewünschte ununterbrochene Leitfähigkeit erreicht wird. Als Metallpartikel eignet sich beispielsweise Aluminiumpulver in Plättchenform.The adhesive thus serves as a carrier for the reflective particles and at the same time as a binder by means of which the reflective plane surfaces of adjacent spherical eight are connected to one another. To optimize the reflective effect, a conductive material in the form of microfine particles is added to the mixture of adhesive and reflective metal particles. Such a material, which is finely distributed in the submicron range, is sufficient in extremely small quantities to generate an almost complete conductivity in the reflective layer applied to the flat surfaces. The micro-fine structure of the additionally incorporated electrically conductive material, for example conductive carbon black, bridges any gaps that may occur between metal particles, so that a desired uninterrupted conductivity is achieved. Aluminum powder in platelet form, for example, is suitable as the metal particle.

Claims (10)

1. Verfahren zur Herstellung eines Tripelspiegel enthaltenden, kugelförmigen, aus gleichförmigen Kugelachteln zusammengesetzten Radarreflektors, wobei die Kugelachtel aus Schaumstoff bestehen, deren einander berührende Planflächen reflektierend ausgebildet sind, dadurch gekennzeichnet, dass jedes einzelne Kugelachtel in einer entsprechenden Form mit allseitig glatten Oberflächen ausgeschäumt wird und nach dem Ausschäumen Radarstrahlen reflektierendes Material mit den Planflächen verbunden wird.1. A method for producing a triple mirror-containing spherical radar reflector composed of uniform spherical eighths, wherein the spherical eighth consist of foam, the contacting plane surfaces of which are reflective, characterized in that each individual spherical eighth is foamed in a corresponding shape with smooth surfaces on all sides and after foaming, radar rays reflecting material is connected to the plane surfaces. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Radarstrahlen reflektierende Material in Form eines Gemisches aus einem Kleber und darin gleichmässig verteilten metallischen Partikeln auf die Planflächen der Kugelachtel aufgebracht wird.2. The method according to claim 1, characterized in that the radar reflecting material in the form of a mixture of an adhesive and evenly distributed therein metallic particles is applied to the flat surfaces of the spherical eight. 3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass dem Kleber ein weiteres elektrisch leitendes Material zugegeben wird.3. The method according to claim 2, characterized in that a further electrically conductive material is added to the adhesive. 4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass als Radarstrahlen reflektierendes Material Metallfolien dienen, die auf die Planflächen der Kugelachtel des Radarreflektors aufgeklebt werden.4. The method according to claim 1, characterized in that metal foils serve as radar reflecting material, which are glued to the flat surfaces of the spherical eight of the radar reflector. 5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Radarreflektor aus Kugelachteln mit unterschiedlichen Raumgewichten zusammengesetzt wird.5. The method according to claim 1, characterized in that the radar reflector is composed of spherical eight with different densities. 6. Radarreflektor hergestellt nach dem Verfahren gemäss einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass er aus in Formen geschäumten, gleichförmigen, glatte Oberflächen aufweisenden Kugelachteln (1, 2, 3, 4) besteht, deren Planflächen (6, 6') mit einem Radarstrahlen reflektierenden Material beklebt sind.6. Radar reflector manufactured by the method according to one of claims 1 to 5, characterized in that it consists of foamed, uniform, smooth surfaces with spherical quaits (1, 2, 3, 4), the flat surfaces (6, 6 ') are covered with a material reflecting radar rays. 7. Radarreflektor nach Anspruch 6, dadurch gekennzeichnet, dass die Planflächen der Kugelachtelteile (1, 2,...) mit einem Gemisch aus einem Kleber und darin gleichmässig verteilten Partikeln aus einem Radarstrahlen reflektierenden Metall überzogen sind, derart, dass zwischen den einander berührenden Planflächen (6/6') der Kugelachtel (1/2) eine homogene Radarstrahlen reflektierende Schicht angeordnet ist, die ferner die Kugelachtel (1, 2,...) miteinander verbindet.7. Radar reflector according to claim 6, characterized in that the flat surfaces of the spherical eight parts (1, 2, ...) are coated with a mixture of an adhesive and evenly distributed particles made of a radar reflecting metal, such that between the touching Flat surfaces (6/6 ') of the spherical eight (1/2) a homogeneous radar-reflecting layer is arranged, which further connects the spherical eight (1, 2, ...) with each other. 8. Radarreflektor nach Anspruch 7, dadurch gekennzeichnet, dass in der Radarstrahlen reflektierenden Schicht ein weiteres elektrisch leitendes Material in Form von Partikeln eingebettet ist.8. Radar reflector according to claim 7, characterized in that in the radar reflecting layer, another electrically conductive material is embedded in the form of particles. 9. Radarreflektor nach Anspruch 6, dadurch gekennzeichnet, dass mindestens ein Kugelachtel ein höheres Raumgewicht aufweist als die übrigen Kugelachtel.9. Radar reflector according to claim 6, characterized in that at least one spherical eight has a higher density than the remaining spherical eight. 10. Radarreflektor nach Anspruch 6, dadurch gekennzeichnet, dass die aus den Kugelachteln (1, 2, 3, 4) zusammengesetzte Kugel von einer Aussenhülle aus glasfaserverstärktem Polyester umschlossen ist.10. Radar reflector according to claim 6, characterized in that the ball composed of the spheres (1, 2, 3, 4) is enclosed by an outer shell made of glass fiber reinforced polyester.
EP86116349A 1985-12-19 1986-11-25 Method of producing a radar reflector Withdrawn EP0227950A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3545096 1985-12-19
DE19853545096 DE3545096A1 (en) 1985-12-19 1985-12-19 METHOD FOR PRODUCING A RADAR REFLECTOR

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EP0227950A2 true EP0227950A2 (en) 1987-07-08
EP0227950A3 EP0227950A3 (en) 1987-09-23

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US (1) US4785301A (en)
EP (1) EP0227950A3 (en)
JP (1) JPS62230103A (en)
DE (1) DE3545096A1 (en)
NO (1) NO865102L (en)

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EP0227950A3 (en) 1987-09-23
DE3545096A1 (en) 1987-07-09
US4785301A (en) 1988-11-15
NO865102D0 (en) 1986-12-17
JPS62230103A (en) 1987-10-08
NO865102L (en) 1987-06-22

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