JP2555982Y2 - Radar reflector - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflector for a radar used for a target or a rescue buoy.

[0002]

2. Description of the Related Art A radar reflector used for a homing performance test target of a radar homing vehicle or a rescue buoy searched by a radar has a hollow triangular pyramid shape having an open bottom surface and has three slopes formed on each other. There is a type in which a number of reflector elements each having an opposing surface as a radio wave reflecting surface are arranged in a polyhedral shape with their open surfaces facing outward.

This radar reflector reflects a radio wave emitted from a radio wave emitting source such as a radar homing flying body toward the above-mentioned radio wave emitting source, and a radio wave incident on a reflector element having a hollow triangular pyramid shape is The light is sequentially reflected by the three reflecting surfaces of the reflector element and is emitted in a direction parallel to the direction of incidence on the reflector element.

[0004] There are two types of radar reflectors, one having a rigid structure and the other having a stretchable type. A rigid-structure reflector has a structure in which each reflector element includes a metal plate such as an aluminum plate.
Alternatively, it is formed of a hard reflecting plate made of a hard resin plate or the like having a radio wave reflecting coating on its surface, and each reflector element is arranged in a polyhedral shape and rigidly joined.
However, since the reflector having the rigid structure has the reflector elements rigidly connected to each other, there is a problem that transportation is troublesome.

On the other hand, in the case of a stretchable reflector, each reflector element is formed of a flexible reflective film, and each reflector element is arranged in a polyhedral form. Each reflector (the top of the polyhedron) is connected to each top balloon of the reflector main body.

This expandable reflector is used by inflating the balloon by injecting air into the balloon to expand the reflector body in a polyhedral shape. This reflector removes air from the balloon. Accordingly, the reflector main body can be folded together with the balloon, so that the entire reflector can be reduced in size to be easily transported.

[0007]

However, since the above-mentioned conventional expandable reflector expands the reflector main body by inflating the balloon, each reflector element is balanced with an equal expansion tension when the reflector main body is expanded. There is a problem that it is difficult to expand well, so that each reflector element expands in a distorted state, and it is difficult to obtain good radio wave reflection characteristics.

An object of the present invention is to make each reflector element a flexible triangular pyramid having no distortion while expanding each reflector element with a flexible reflecting film. An object of the present invention is to provide a radar reflector that can be obtained.

[0009]

SUMMARY OF THE INVENTION A radar reflector according to the present invention comprises:

A large number of reflector elements each having a hollow triangular pyramid shape with an open bottom surface and a flexible reflection film whose three slopes oppose each other are radio wave reflection surfaces, with the open surfaces facing outward. In a radar reflector combined in a polyhedral shape,

A plurality of upper aggregates are radially provided on the upper portion of the column with the base ends pivotally connected to the column, and the lower portion of the upper column is shifted by half a pitch in the circumferential direction of the column above the upper aggregate. The same number of lower aggregates as the aggregates are radially provided with their base ends pivotally attached to the columns, and one end is pivotally attached to each of the aggregates at a slide member which is slidably fitted to the columns. A bone structure pivotally connected to the other end of a support arm that rotates between a state in which the aggregate protrudes from the support and a state in which the aggregate protrudes along the support with the slide of the slide member,

A triangular area between each of the upper aggregates of the bone structure;
A triangular region between the lower aggregates, a triangular region having the vertices of the tips of two adjacent upper aggregates and the tip of one lower aggregate corresponding thereto, and two adjacent lower aggregates A hollow triangular pyramid-shaped reflector element made of a flexible reflective film is arranged in a triangular region having the top and the top of one upper aggregate corresponding to the top as a vertex, and

Each of the reflector elements disposed in the triangular area between the upper aggregates and the triangular area between the lower aggregates has one of the three apex corners of the open edge of the reflector element. Fixing to the base of two aggregates on both sides of the triangular area, and fixing the other two apex corners to the tips of the two aggregates, respectively, and supporting these aggregates;

A triangular region having vertices at the tips of the two upper aggregates and one lower aggregate, and a triangular region having vertices at the tips of the two lower aggregates and one upper aggregate. Each of the disposed reflector elements has the three apexes of the open edge fixed to the tip of each of the aggregates to be supported by these aggregates, and
The apex of each of these reflector elements is connected to a support or a slide member of the bone structure.

[0015]

The radar reflector according to the present invention is expanded and contracted by sliding a slide member of the bone structure. The slide member is slid in one direction to support the upper and lower aggregates by supporting arms. When radially extended from, each reflector element made of a flexible reflective film is extended in a hollow triangular pyramid shape, the entire reflector is extended in a polyhedral shape, and the slide member is slid in the opposite direction to be supported by a support arm. When each of the upper and lower aggregates is rotated so as to lie down along the column, each reflector element is folded outside the column and the entire reflector is reduced.

In the radar reflector according to the present invention, the reflector elements arranged in the triangular area between the upper aggregates and the triangular area between the lower aggregates are connected to the three apex portions of the open edge. Are fixed to the bases of two aggregates on both sides of the triangular region, and the other two apex are fixed to the tips of the two aggregates, respectively. A triangular area which is supported by the aggregate and has the tops of two upper aggregates and one lower aggregate as vertices; and a triangular area which has two vertices as the tops of lower aggregate and one upper aggregate. Each of the reflector elements disposed at the three corners of the open edge are fixed to the tip of each of the aggregates and supported by these aggregates.
Since the apex of each of these reflector elements is connected to the column or the slide member of the bone structure, the position of each of the three apex corners of the open edge of each reflector element is defined by three aggregates. The apex of the cone is pulled toward the column, and is stretched into a hollow triangular pyramid without distortion.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 12 shows an offshore target used for a homing performance test of a radar homing air vehicle. The radar reflector A of this embodiment is fixed to the upper end of a mast 2 erected on a floating body 1. I have.

FIGS. 1 and 2 are perspective views of the radar reflector A in an extended state and a contracted state. The reflector A is supported by a bone structure 10 having the structure shown in FIGS. Are arranged in a regular polyhedron shape.

The reflector A of this embodiment has a total of 20 reflector elements 20 in which five reflector elements 20 are annularly arranged at the upper part and lower part, respectively, and ten reflector elements 20 are annularly arranged at the middle part. Positive 2 consisting of reflector element 20
The shape of the reflector A is 0 m, and the diameter of the entire reflector A is 1 m.
２2 m. First, the reflector element 20 will be described. FIG. 6 is a perspective view of the reflector element 20, FIG. 7 is an exploded view thereof, and FIG. 8 is an enlarged sectional view taken along line VIII-VIII of FIG.

The reflector element 20 has a hollow triangular pyramid shape having an open bottom surface, and three opposing surfaces of the three slopes are radio wave reflecting surfaces. The reflector element 20 has a right-angled isosceles triangular shape. Three flexible reflective films
It consists of 21. The flexible reflective film 21 is made of a cloth in which a metal wire such as a stainless steel wire is woven or a resin film (for example, a polyethylene film) on which a metal film such as aluminum is deposited on the surface.
Is formed by sewing the oblique sides of three flexible reflective films 21 together.

Further, the bottom sides of the three flexible reflective films 21,
In other words, a tension cable (for example, a flexible wire) 22a is sewn over the entire length of the side serving as the open edge of the reflector element 20, and the entire length of the ridge line where the flexible reflective films 21 are sewn is also sewn. The tension cable 22b is sewn over.

These tension cords 22a and 22b receive a tensile force applied to each flexible reflective film 21 when the reflector element 20 is extended in a hollow triangular pyramid shape, and are sewn to each ridge of the reflector element 20. Three tension cords 22b
Are connected to each other at the apex of the reflector element 20 and each open edge of the reflector element 20 (the flexible reflective film).
At the apex of the open edge of the reflector element 20, the tension cords 22a sewn to the bottom edge of the reflector element 21 are connected to the tension cords 22a of the adjacent open edge and the tension cords 22b of the ridge.

The reflector element 20 sequentially reflects radio waves emitted from the radar homing flying object and the like and incident on the reflector element 20 on the film surface of each flexible reflection film 21 as shown by arrows in FIG. The reflector element 20 has a regular triangular pyramid shape, so that the radio wave finally emitted from the reflector element 20 is emitted in a direction parallel to the incident direction to the reflector element 20. Go.

Next, the bone structure 10 that supports the reflector element 20 will be described. FIGS. 3 and 4 are perspective views of the bone structure 10 in an expanded state and a contracted state, and FIG.
10 is a longitudinal sectional view of FIG.

The bone structure 10 has an umbrella skeleton having a structure similar to that of a parasol umbrella, at the upper and lower parts of a pipe-like column 11 fixed vertically to the upper end of the mast 2 on the floating body 1 shown in FIG. The upper umbrella part is provided with a plurality (five in this embodiment) of upper aggregates 12a in a radial manner by pivotally connecting the base end of the upper aggregate 12a to the outer periphery of the upper end of the column 11 by a hinge member. With
Each of the upper aggregates 12a is rotated between a state in which the upper aggregates 12a are projected obliquely downward from the columns 11 (the state shown in FIG. 3) and a state in which they fall down along the columns 11 (the state shown in FIG. 4). The supporting arm 13a is connected to the supporting arm 13a.

The lower umbrella part is provided with the same number (five) of lower aggregates 12b as the upper aggregate 12a in a radial manner by pivotally connecting the base end thereof to the outer periphery of the lower end of the column 11 by a hinge member. At the same time, each lower aggregate 12b is
3 and a support arm 13b for rotating the support arm 13b between a state in which the support arm 13b is folded upward along the column 11 (a state in FIG. 4). The member 12b is provided to be shifted from the upper aggregate 12a by a half pitch in the circumferential direction of the support.

The bases of the adjacent upper aggregates 12a, 12a and the bases of the adjacent lower aggregates 12b, 12b are in contact with each other at their side edges, and are in the extended state shown in FIG. The opening angle between the upper aggregates 12a and 12a and the opening angle between the lower aggregates 12b and 12b are determined by the angle (60 degrees) of each vertex of the open edge in the expanded state of the reflector element 20.
゜) is the same.

On the other hand, on the outside of the support 11,
A cylindrical slide member 14 having a length approximately half of that of the column 11 is loosely fitted so as to be slidable in the column length direction (vertical direction). The slide member 14 is an electric jack 15 provided inside the column 11.
(See FIG. 5), and is slid to the middle part of the support 11 and the lower half of the support 11. In FIG. 5, reference numeral 15a denotes a slide member connecting shaft provided at the upper end of the plunger of the electric jack 15, and the connecting shaft
15a is connected to the slide member 14 through a slit 11a provided on the side wall of the column 11 along the length direction thereof.

One end of the support arm 13a for rotating the upper aggregate 12a is pivotally attached to the upper end of the slide member 14, and the other end is pivotally attached to the longitudinal middle portion of the upper aggregate 12a. The support arm 13a rotates the upper aggregate 12a in the extended state shown in FIG. 3 with the sliding of the slide member 14 to the intermediate portion of the support, and the slide member to the lower half of the support.
With the slide 14, the upper aggregate 12a is rotated to the lying state shown in FIG.

One end of a support arm 13b for rotating the lower aggregate 12b is pivotally attached to the lower end of the slide member 14, and the other end is pivotally attached to a longitudinal middle portion of the lower aggregate 12b. The support arm 13b pivots the lower aggregate 12b to the extended state shown in FIG. 3 with the sliding of the slide member 14 to the intermediate portion of the support, and the slide member 14b to the lower half of the support.
With this slide, the lower aggregate 12b is turned to the lying state shown in FIG.

Next, the connection between the above-mentioned bone structure 10 and the reflector element 10 having the shape of a hollow triangular pyramid made of the above-mentioned flexible reflective film 21 will be described. A triangular area between the aggregates 12a, 12a, a triangular area between the lower aggregates 12b, 12b, and two adjacent upper aggregates
12a, the tip of 12a and one lower aggregate 12b corresponding to the tip
A triangular area having the top as the top and two adjacent lower aggregates 12b, 12b, and one upper aggregate corresponding to the top
12a and a triangular area with the vertex at the top.

The reflector element 20 arranged in a triangular area between the upper aggregates 12a, 12a is, as shown in FIG.
One of the three apex corners of the open edge is fixed to the base of two upper aggregates 12a, 12a on both sides of the triangular area, and the other two apex corners are the two apex corners. Upper aggregates 12a, 12a
The reflector elements 20 are fixed to the tips of the upper aggregates 12a and 12a, respectively, and the top of the cone of the reflector element 20 is adjacent to the upper outer peripheral surface of the upper column 11 of the support 11 of the bone structure 10. It is connected to a rib plate 16 projecting from the middle of 12a.

The reflector element 20 has tension cords 22a and 22b sewn on its open edge and each ridge.
The upper ends of the upper aggregates 12a, 12a are fixed to the upper aggregates 12a, 12a.
a and the upper aggregate 12 of the reflector element 20
The two open edges along a, 12a are also fixed to the upper aggregates 12a, 12a along the entire length or at a plurality of locations.

Further, the rib plate 16 is provided with a reflector element.
When the reflector element 20 is extended in the shape of a hollow triangular pyramid with the three apical corners of 20 fixed to the upper aggregates 12a, 12a as described above, the side of the reflector element 20 facing the column 11 The ridge portion of the reflector element 20 is dimensioned so as to be in contact with the outer edge of the rib plate 16 over its entire length. The ridge of the reflector element 20 is connected to the rib plate 16 and is fixed to the rib plate 16 at its entire length or at a plurality of locations.

The reflector element 20 arranged in a triangular area between the lower aggregates 12b, 12b is, as shown in FIG.
One of the three apex corners of the open edge is fixed to the base of two lower aggregates 12b, 12b on both sides of the triangular area, and the other two apex corners are fixed to the two apex corners. Lower aggregates 12b, 12b
Each of the reflector elements 20 is fixed to the tip of the bone member and supported by these aggregates.
The connecting members (for example, flexible wires) 23 are connected to the ten slide members 14.

The reflector element 20 is also fixed to the lower aggregates 12b, 12b by fastening the connection ends of the tension cables 22a, 22b to the lower aggregates 12b, 12b. Two open edges along the members 12b, 12b are also fixed to the lower aggregates 12b, 12b along their entire length or at a plurality of locations.

The connecting cable 23 is connected to the reflector element 20.
When the reflector element 20 is extended in the shape of a hollow triangular pyramid with the three apex corners of the three fixed to the lower aggregates 12b, 12b as described above, the distance between the cone top of the reflector element 20 and the support 11 is increased. One end of the connecting cable 23 is fixed to the connecting end of the tension cables 22b, 22b at the apex of the reflector element 20, and the other end is fixed to the slide member 14. Is being worn.

On the other hand, a reflector element 20 arranged in a triangular region having the vertices at the tips of three aggregates of two upper aggregates 12a, 12a and one lower aggregate 12b is shown in FIG. To
The three apexes of the open edge are combined with the three aggregates 12a and 12b.
The three aggregates 12a and 12b are fixed to the tip of
The reflector apex of the reflector element 20 is connected to the slide member 14 of the bone structure 10 by a connecting cable 23, similarly to the reflector element 20 between the lower aggregates 12b, 12b.

The same applies to the reflector element 20 which is arranged in a triangular area having the vertices at the tips of three aggregates of two lower aggregates 12b, 12b and one upper aggregate 12a. As shown in FIG. 10, the reflector element 20 has three open edges.
The three corners are fixed to the tips of the three aggregates 12a, 12b, respectively, and are supported by the three aggregates 12a, 12b.
It is connected to.

The reflector elements 20 are also fixed to the respective aggregates 12a, 12b by fastening the connection ends of the tension cables 22a, 22b to the tips of the respective aggregates 12a, 12b. The connecting cable 23 connecting the apex of the 20 to the slide member 14 also has a hollow triangular pyramid shape with the three apical corners of the reflector element 20 fixed to the respective aggregates 12a and 12b as described above. The length is such that when it is expanded, the tension is stretched between the apex of the reflector element 20 and the column 11.

That is, the radar reflector according to this embodiment has a state in which the slide member 14 is loosely fitted to the upper and lower portions of the column 11 by sliding the support member 11 so as to protrude from the column 11 and a state in which the reflector 11 falls down along the column 11. A plurality of aggregates 12
The upper aggregates 12a, 12a of the bone structure 10 in which a and 12b are radially provided.
a, each triangular region between the lower aggregates 12b, 12b, two upper aggregates 12a, 12a and one lower aggregate 12b
Each triangular area whose tip is the top and two lower aggregates 12b
, 12b and a triangular region having the tip of one upper aggregate 12a as a vertex, a hollow triangular pyramid-shaped reflector element 20 made of a flexible reflective film 21 is provided at each of three open corners of the open edge thereof. Are fixed to the aggregates 12a and 12b, and the apex of each of the reflector elements 20 is fixed to the support 11 of the bone structure 10.
Alternatively, it is connected to the slide member 14.

The radar reflector has a bone structure 10
The sliding member 14 can be expanded and contracted by sliding the sliding member 14 in one direction (upward), and the upper and lower aggregates are supported by the supporting arms 13a and 13b.
When 12a and 12b are extended radially from the support 11, each reflector element 20 composed of the flexible reflective film 21 is extended in a hollow triangular pyramid shape, and the entire reflector is extended in a polyhedral shape as shown in FIG. The slide members 14 are slid in the opposite direction (downward), and the upper and lower aggregates are supported by the support arms 13a and 13b.
When the mirrors 12a and 12b are rotated so as to lie down along the column 11, each reflector element 20 is folded outside the column 11, and the entire reflector is reduced as shown in FIG.

In the radar reflector, the triangular area between the upper aggregates 12a, 12a and the lower aggregate 12a
reflector elements arranged in the triangular area between b and 12b
Fixing 20 one of the three apexes of the open edge to the base of two aggregates on either side of said triangular area;
The other two apex corners are fixed to the tips of the two aggregates, respectively, and supported by these aggregates, so that the two upper aggregates 12a, 12a
a and a reflector arranged in a triangular region having the apex of the tip of a and one lower aggregate 12b and a triangular region having the apex of the tip of two lower aggregates 12b, 12b and one upper aggregate 12a. element
20, while fixing the three apexes of the open edge to the tip of each of the aggregates and supporting the aggregates,
Since the apex of each of these reflector elements 20 is connected to the column 11 or the slide member 14 of the bone structure 20, each of the reflector elements 20 is positioned at the three apex corners of its open edge by three.
It is defined by the aggregates 12a and 12b, and the apex of the cone is
It is pulled to the side and expands into a hollow triangular pyramid without distortion.

Therefore, according to this radar reflector, each reflector element 20 is extended in the form of a hollow triangular pyramid having no distortion while each reflector element 20 is of the expansion type formed by the flexible reflective film 21. And good radio wave reflection characteristics can be obtained.

In the above embodiment, each of the upper aggregates 12a, 12a
The apex of the reflector element 20 arranged in the triangular area between the a is fixed to the rib plate 16 protruding from the column 11 of the bone structure 10, and the apex of the reflector element 20 is the other reflector element 20. Similarly to the above, it may be connected to the upper part of the column 11 by a connecting line.

In the above embodiment, the upper support arm 13a for rotating the upper aggregate 12a and the lower support arm 13b for rotating the lower aggregate 12b are connected to the upper and lower ends of the same slide member 14. However, the slide member for pivotally connecting the upper support arm 13a and the slide member for pivotally connecting the lower support arm 13b may be different members.

Further, the reflector A of the above embodiment is used as a target for a homing performance test of a radar homing vehicle, but the present invention is applied to a radar reflector or the like used for a rescue buoy or the like searched by a radar. Can also be applied.

[0049]

[Effect of the invention] According to the radar reflector of the invention,
Each of the reflector elements arranged in the triangular region between the upper aggregates of the bone structure and the triangular region between the lower aggregates is connected to one of the three apex portions of the open edge by the triangle. Two upper aggregates are fixed to the base of two aggregates on both sides of the region and the other two apex portions are respectively fixed to the tips of the two aggregates and supported by these aggregates. Each of the reflector elements arranged in a triangular area having the tip of one lower aggregate as a vertex and two triangular areas having the tip of two lower aggregates and one upper apex as an apex thereof has an open edge. The three apical corners are fixed to the tips of the respective aggregates and supported by these aggregates,
Since the apex of each of these reflector elements is connected to the column or the slide member of the bone structure, the position of each of the three apex corners of the open edge of each reflector element is defined by three aggregates. Since the apex of the cone is pulled toward the pillar side and stretches into a hollow triangular pyramid without distortion, each reflector element is formed of a flexible reflective film, but each reflector element is hollow without distortion. Good radio wave reflection characteristics can be obtained by extending in a triangular pyramid shape.

[Brief description of the drawings]

FIG. 1 is a perspective view of a reflector in an extended state.

FIG. 2 is a perspective view of the reflector in a reduced state.

FIG. 3 is a perspective view of a bone structure in an extended state.

FIG. 4 is a perspective view of a bone structure in a reduced state.

FIG. 5 is a longitudinal sectional view of a bone structure.

FIG. 6 is a perspective view of a reflector element.

FIG. 7 is an exploded view of a reflector element.

FIG. 8 is an enlarged sectional view taken along line VIII-VIII in FIG. 6;

FIG. 9 is a mounting state diagram of a reflector element arranged in a triangular area between upper aggregates.

FIG. 10 is a mounting state diagram of a reflector element arranged in a triangular area between lower aggregates.

FIG. 11 shows a triangular region having the vertices of the tips of two upper aggregates and one lower aggregate, and a triangular region having the vertices of two lower aggregates and the tip of one upper aggregate. FIG. 4 is a mounting state diagram of a reflector element to be arranged.

FIG. 12 is a front view of an offshore target using a reflector.

[Explanation of symbols]

A: reflector, 10: bone structure, 11: support column, 12a: upper aggregate, 12b: lower aggregate, 13a, 13b: support arm, 14: slide member, 15: jack, 16: rib plate, 20: reflector element , 21 ... flexible reflective film, 22a, 22b ... tension cable,
23 ... Connecting rope.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroaki Sekizawa 3175 Showa-cho, Kanazawa-ku, Yokohama-shi, Kanagawa Prefecture Inside Japan Aircraft Co., Ltd. (56) References JP-A-52-40046 (JP, A) 124930 (JP, U) Actually open 1986-195610 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A plurality of reflector elements each having a hollow triangular pyramid shape with an open bottom surface and a flexible reflection film whose three inclined surfaces oppose each other are radio wave reflection surfaces, and the open surfaces of which are outward. In a reflector for a radar arranged in a polyhedral shape, a plurality of upper aggregates are radially provided on the upper portion of a column by pivotally connecting a base end thereof to the column, and the upper aggregate is formed at a lower portion of the column. The same number of lower aggregates as the upper aggregates are radially displaced by a half pitch in the circumferential direction of the strut and the base ends thereof are pivotally connected to the struts, and each of the aggregates is slidably loosely fitted to the strut. The other end of the support arm is pivotally attached to one end of the supporting arm for pivoting the aggregate into a state in which the aggregate protrudes from the support and a state in which the aggregate protrudes along the support with the slide of the slide member. With a bone structure, this The triangular area between the upper aggregates of the structure, the triangular area between the lower aggregates, and the tips of two adjacent upper aggregates and the tip of one lower aggregate corresponding to the triangles are set as vertices. The triangular area, the tip of two adjacent lower aggregates, and 1
A hollow triangular pyramid-shaped reflector element made of a flexible reflective film is arranged in a triangular area having the tip of the upper aggregate as a vertex, and a triangular area between each of the upper aggregates and each lower bone. Each of the reflector elements arranged in the triangular region between the lumbers fixes one of the three vertex angles of the open edge thereof to the base of two aggregates on both sides of the triangular region, and Are fixed to the tips of the two aggregates, respectively, and are supported by these aggregates. A triangular area having the tops of the two upper aggregates and one lower aggregate as vertices And the reflector elements arranged in the two lower aggregates and in the triangular region having the top of one upper aggregate as the apex, the three apexes of the open edges of the reflector elements are provided at the tips of the respective aggregates. Each of the reflectors is fixed and supported by these aggregates, and the apex of each of these reflector elements is supported by a support of the bone structure. Other reflector radar, characterized in that coupled to the slide member.