JPH05152833A - Corner reflector for radar - Google Patents

Abstract

PURPOSE:To obtain the corner reflector for a radar in which the intensity of the reflector is large by tilting each assembly plate by a prescribed angle respectively with respect to a pole so as to allow an azimuth pole coordinate diagram to be of a six-valve pattern thereby decreasing a radar search defect region. CONSTITUTION:Since 1st, 2nd, 3rd, 4th assembling plates 4, 5, 6, 7 and an equator plate 1 are tilted respectively by an angle of 45 deg. with respect to a pole, when the pole 42 is stood upright, six corner reflectors among eight corner reflectors except two corner reflectors to which a ceiling plate 31 and a ground plate 32 being reinforcing plates act like independent corner reflectors with respect to a radar radio wave being a plane wave made incident from almost the horizontal direction to a reflector 41. Thus, the azimuth polar coordinate diagram has a six-valve pattern having a broad pattern.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a corner reflector for a radar, which is attached to a small target such as a small ship or a structure on the sea and serves to enhance the reflection of radar radio waves.

[0002]

2. Description of the Related Art As shown in FIGS. 4 to 6, a reflector a in a conventional radar corner reflector has a pipe member c made of aluminum or the like at the center of a square equatorial plate b made of aluminum or the like. Four assembly plates (hereinafter referred to as first and second plates) made of aluminum or the like and formed into an isosceles right triangle having the same shape are attached to one radio wave reflecting surface of the equatorial plate b through the equatorial plate b. , 3rd and 4th assembly plates) d, e,
f and g are fixed to one side of the isosceles side along the diagonal line of the equatorial plate b, and the other side of the isosceles side is fixed to the pipe member c. Boards d, e,
Four corner reflectors (hereinafter referred to as the first, second, third and fourth corner reflectors) h, i, j and k are formed by f and g and the equatorial plate b, and the other radio wave reflection of the equatorial plate b is formed. In terms of surface, four assembly plates (hereinafter referred to as the fifth, sixth, seventh and eighth assembly plates) m, n, o, p made of the same material as the above assembly plate and having the same shape are respectively described above. Similarly, the four corner reflectors (hereinafter, fifth, sixth, seventh and eighth) are fixed by the fifth, sixth, seventh and eighth assembly plates m, n, o, p and the equatorial plate b. (Corner reflector) q, r, s, t are formed,
8 corner reflectors h, i, j, k,
It has q, r, s, and t.

A conventional radar corner reflector v in which the above-mentioned reflector a is rotatably attached to a pole u
As shown in FIG. 7, the pole u is used by being erected on a small boat or the like.

By the way, the conventional radar corner reflector v has eight corner reflectors h, i,
Although having j, k, q, r, s, and t, the first and fifth corner reflectors h, h are used for the radar wave which is a plane wave incident on the reflector a from a substantially horizontal direction. q
Both function as one corner reflector, and similarly, the second and sixth corner reflectors i, r, the third and seventh corner reflectors j, s, and the fourth and eighth corner reflectors k, s are also both. Since it functions as a single corner reflector, the azimuth polar diagram has four broad patterns as shown in FIG.
This results in a valve pattern, and there is a problem in that detection by the radar becomes defective in the regions D to L in FIG.

Further, in the conventional radar corner reflector v, since the reflector a must be assembled and transported to the installation site in advance, the handling of the reflector a during transportation is inconvenient and a space for transportation and storage is required. There was also a problem that was necessary.

[0006]

In view of the above-mentioned problems of the prior art, in the present invention, the structure of the reflector is kept substantially the same as the structure of the conventional reflector having eight corner reflectors, and By changing the polar coordinate diagram from a 4-valve pattern to a 6-valve pattern, the radar detection failure area is reduced, and the reflector can be easily and easily assembled at the installation site, and the strength of the assembled reflector is large. It is intended to provide a corner reflector.

[0007]

In order to solve the above-mentioned problems, according to the present invention, assembly holes are provided along two diagonal lines of a square equatorial plate, at least one surface of which is a radio wave reflection surface. In addition, a concave portion and a convex portion are formed at the bases of the right-angled isosceles triangle formed by dividing the equatorial plate into two at a diagonal, and at least one surface is a radio wave reflection surface. 1st, 2nd, 3rd and 4th
In the assembly plate, the first and second assembly plates have slits that run perpendicularly to the respective bases from respective right-angled vertices to respective central portions, and the third and fourth
The assembly plate has a slit that runs perpendicular to each of the bases from the midpoint of each of the bases to the center of each, and each convex portion of the first and second assembly plates has the equatorial plate. In the mounting hole along one diagonal line, the first and second assembly plates are integrally coupled with the equatorial plate by concave and convex fitting, and the slit of the third assembly plate is The protrusions of the third assembly plate are meshed with the slits of the first assembly plate, the protrusions of the third assembly plate are passed through the mounting holes along the other diagonal line of the equatorial plate, and the slits of the fourth assembly plate are the second assembly plate. The protrusions of the fourth assembly plate are also meshed with the slits of the plate, and the projections of the fourth assembly plate are also penetrated through the mounting holes along the other diagonal line of the equator plate, and the third and fourth assembly plates also sandwich the equator plate. Integral with concave and convex fitting in the state Is engaged, the first, second, third
And the fourth assembly plate and the equator plate form eight corner reflectors, and each of the three corner reflectors constitutes two arbitrary corner reflectors that are located in point symmetry with respect to the center point of the equator plate. The plate pieces are joined together by a reinforcing plate, and the two corner reflectors are respectively reinforced by the reinforcing plate. The reinforcing plate, the first, second, and
A reflector is constructed by the third and fourth assembly plates and the equatorial plate, and a pole is penetrated through the central portion of the reflector and the reinforcing plate, and the reflector is rotatably attached to the pole. At the same time, the first, second, third and fourth assembly plates and the equatorial plate are respectively arranged with respect to the pole.
It is configured to be inclined by 5 degrees.

[0008]

The operation of the present invention having the above construction will be described below with reference to FIGS.

According to the present invention, since the first, second, third and fourth assembly plates 4,5,6,7 and the equatorial plate 1 are inclined 45 degrees with respect to the pole 42 respectively, FIGS. As shown in FIG. 2, when the pole 42 is erected vertically, eight corner reflectors formed by the first, second, third and fourth assembly plates 4, 5, 6, 7 and the equatorial plate 1 are formed. Of the six corner reflectors (four of the six corner reflectors 21, 22, 23, 24 are shown in FIG. 1 except for the two corner reflectors to which the top plate 31 and the base plate 32, which are reinforcing plates, are attached. 2) respectively function as independent corner reflectors for radar waves that are plane waves incident on the reflector 41 in a substantially horizontal direction. Therefore, FIG.
As shown in FIG. 2, the azimuth polar coordinate diagram is a 6-valve pattern having 6 broad patterns.

The present invention is also directed to the first and second assembly plates 4,
5 is penetrated into the mounting hole 2 along one diagonal line of the equatorial plate 1, and the first and second assembly plates 4, 5 are formed.
Are joined together by concavo-convex fitting while sandwiching the equatorial plate 1,
The slits 13 of the third assembly plate 6 mesh with the slits 12 of the first assembly plate 4, and the slits 1 of the fourth assembly plate 7
3 is meshed with the slit 12 of the second assembly plate 5, and the protrusions 10 of the third and fourth assembly plates 6 and 7 are penetrated into the mounting holes 2 along the other diagonal line of the equatorial plate 1.
Not only the third and fourth assembly plates 6 and 7 are integrally joined by the concave-convex fitting while sandwiching the equatorial plate 1, but also the first and third plates.
The assembly plates 4 and 6 and the equatorial plate 1 are integrally connected by a top plate 31 which is a reinforcing plate, and the second and fourth assembly plates 5 and 7 and the equatorial plate 1 are integrally connected by a base plate 32 which is a reinforcing plate. Therefore, the strength of the reflector 41 is high, and
Since the reflector 41 is rotatably attached to the pole 42, even when an external force such as wind is applied to the reflector 41, the external force can be received by the rotation of the reflector 41, Top plate 31 and base plate 3 which are reinforcing plates
Combined with the reinforcement by 2, the life of the reflector 41 is extended.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of implementation of a radar corner reflector according to the present invention will be described below with reference to FIGS. In FIGS. 1 to 3, members having the same uses as those of the conventional technique are given the same names as those used in the conventional technique.

In FIG. 3, a square equatorial plate 1 is made of high-density polyethylene, both sides of which aluminum foil is heat-welded to have radio wave reflecting surfaces, and four assembly holes 2 are formed along a diagonal line. Are provided at a predetermined pitch. Therefore, a total of eight assembly holes 2 are provided at a predetermined pitch along two diagonal lines, and a through hole 3 is provided at the center.

The first, second, third and fourth assembly plates 4, 5, which are made of the same material as the equatorial plate 1 and have aluminum foils heat-welded on both sides to form radio wave reflecting surfaces on both sides. Reference numerals 6 and 7 have substantially the same shape as a right-angled isosceles triangle formed by dividing the equatorial plate 1 into two along a diagonal line. Two rectangular concave portions 9 and two convex portions 10 are formed alternately from the end along the bottom side and perpendicular to the bottom side 8 at a predetermined pitch, and an inverted U-shaped notch 11 is formed in the center of the bottom side 8. Are recessed perpendicularly to the bottom side 8.

In the above-mentioned first, second, third and fourth assembly plates 4,5,6,7, the first and second assembly plates 4,5
Each have a slit 12 running perpendicularly to the base 8 from the right-angled apex to the center, and sandwiching the equatorial plate 1 so as to be point-symmetrical with respect to the center point of the equatorial plate 1. Is arranged perpendicularly to the equatorial plate 1, and the convex portion 10 is formed in the mounting hole 2 along one diagonal line of the equatorial plate 1.
Are penetrated, one convex portion 10 is fitted in the other concave portion 9, and they are integrally coupled by concave-convex fitting while sandwiching the equatorial plate 1.

The third and fourth assembly plates 6 and 7 have slits 13 running perpendicularly to the base 8 from the apex of the notch 11 to the center, and at the center point of the equatorial plate 1. On the other hand, the third assembly plate 6 is perpendicular to the equatorial plate 1 while sandwiching the equatorial plate 1 so as to be point-symmetrical to each other, and the third assembly plate 6 is orthogonal to the first assembly plate 4, and the fourth assembly plate 7 Is the second assembly plate 5
And the slit 1 of the third assembly plate 6 are arranged orthogonally to
3 is meshed with the slit 12 of the first assembly plate 4, the slit 13 of the fourth assembly plate 7 is meshed with the slit 12 of the second assembly plate 5, and a mounting hole along the other diagonal line of the equatorial plate 1. 2, the convex portion 10 is penetrated, one convex portion 10 is fitted into the other concave portion 9,
The equator plate 1 is sandwiched and is integrally joined by concave and convex fitting.

When the first, second, third and fourth assembly plates 4, 5, 6, 7 are erected on the equatorial plate 1 as described above, the first, second, third and fourth plates are installed. Eight corner reflectors (8 by the assembly plates 4, 5, 6, 7 and the equatorial plate 1)
4 of the corner reflectors 21, 22, 23,
24 is shown in FIG. 1 or FIG. ) Is formed.

Of the above eight corner reflectors,
Arbitrary two points that are symmetrical with respect to the center point of the equatorial plate 1
In each corner reflector, the first and third assembly plates 4 and 6 constituting one of the two corner reflectors and the outermost edge of each plate piece of the equatorial plate 1 are formed by the side. Each side of the top plate 31, which is a reinforcing plate having the same shape as the regular triangle, is fixed by an adhesive or the like, or one side of the top plate 31 is hinged to any outermost side, The second and fourth assembly plates 5, 7 which are attached by a mounting structure or the like that hooks the other two sides of the plate 31 to the corresponding outermost sides and constitutes the other corner reflector of the two corner reflectors, and At the outermost side of each plate piece of the equatorial plate 1, each side of a base plate 32, which is a reinforcing plate having the same shape as an equilateral triangle formed by the side, is attached by the same means as the top plate 31, First and third Upright 4,6 and equatorial plate 1 is bonded together by the top plate 31, the second and fourth assembly plate 5,
7 and the equatorial plate 1 are integrally connected by a base plate 32, and the two corner reflectors are reinforced by a top plate 31 or a base plate 32, respectively. A circular hole 33 is formed at the center of each of the top plate 31 and the base plate 32.

A reflector 41 constructed by the top plate 31, the base plate 32, the equatorial plate 1, and the first, second, third and fourth assembly plates 4, 5, 6, 7 is shown in FIGS. As shown, the through hole 3 of the equatorial plate 1, the top plate 31 and the round hole 33 of the base plate 32, and the first, second, third and fourth assembly plates 4,
The notched portions 11, 5, 6 and 7 are passed through the columnar pole 42, are held between the upper and lower washers 43, 44 of the pole 42, and are rotatably attached to the pole 42.

The upper washer 43 is secured to the lower washer 44 by a nut 45 screwed onto the top of the pole 42.
Are attached to the poles 42 by split pins 46 attached to the poles 42, respectively.

As described above, the reflector 41 has the pole 4
Corner reflector 50 for radar attached to 2
Means that the first, second, third and fourth assembly plates 4,5,6,7 and the equatorial plate 1 are each inclined by 45 degrees with respect to the pole 42.

By the way, in the above embodiment, the reflector 4
Although only one 1 is attached to the pole 42, the number of the reflectors 41 attached to the pole 42 is not limited to one and may be any number.

It should be noted that one or more reflectors 41 are provided on the pole 42.
When the radar corner reflector is mounted by attaching the radar corner reflector to the water and the radar corner reflector is floated on water, the radar corner reflector is dropped on the tip of the oil spilled by an airplane or the like. Then, by floating the washed-out oil and the like, it becomes possible to observe the movement status of the washed-out oil and the like with a radar.

Further, in the above-described embodiment, the first, second and
The material of the third and fourth assembly plates 4, 5, 6, 7 and the equatorial plate 1 is high-density polyethylene with aluminum foils heat-welded on both sides, but the first, second, third and fourth assemblies Board 4,
The materials of 5, 6, and 7 and the equatorial plate 1 are not limited to the examples.

Further, in the above-described embodiment, the shapes of the top plates 31 and 32, which are the reinforcing plates, and the ground plate are regular triangles formed by the outermost sides of the three plate pieces that form the corner reflector. However, the shape of the reinforcing plate is not limited to the equilateral triangle, and may be any shape as long as it integrally connects the three plate pieces that form the corner reflector. Therefore, for example, a pentagonal reinforcing plate 60 or the like virtually shown in FIG. 2 may be used.

[0025]

According to the present invention having the above-described structure and operation, the first, the second, the third and the fourth assembled plates have the same structure as the conventional radar corner reflector. In addition, since the equatorial plate is tilted at 45 degrees with respect to the pole, six azimuth polar coordinate patterns are broad for radar waves that are plane waves incident on the reflector from almost horizontal directions. It has a 6-valve pattern. Therefore, in the present invention, the detection failure area by the radar is reduced as compared with the conventional radar corner reflector having a four-valve pattern.

Further, in the present invention, the reflector can be disassembled and carried to the installation site of the present invention, and
Since the reflector can be easily assembled at the installation site, the reflector is easier to handle during transportation compared to the conventional corner reflector for radar that has to be transported to the installation site with the reflector already assembled. Thus, it is possible to reduce the space required for transportation and storage.

Further, the first and second assembly plates are not only integrally connected by the concave and convex fitting while sandwiching the equatorial plate, but also integrally connected to the equatorial plate by the reinforcing plate, and The third and fourth assembly plates are not only integrally connected by the concave and convex fitting with the equatorial plate sandwiched therebetween but also integrally connected to the equatorial plate by the reinforcing plate, so that the strength of the reflector is high. Moreover, since the reflector is rotatably attached to the pole, even if an external force such as wind is applied to the reflector, the external force can be received by the rotation of the reflector, and the reinforcing plate In combination with the reinforcement by, the life of the reflector is extended.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an embodiment.

FIG. 2 is a view on arrow Y of what is shown in FIG.

FIG. 3 is an exploded perspective view of a reflector among those shown in FIG.

FIG. 4 is a perspective view showing an example of a conventional reflector.

5 is a view on arrow A of what is shown in FIG. 4. FIG.

FIG. 6 is a view on arrow B of what is shown in FIG.

FIG. 7 is a perspective view showing an example of use of the one shown in FIG. 4 in a small boat.

8 is a schematic view of an example of an azimuth polar coordinate diagram shown in FIG. 7. FIG.

9 is a schematic diagram of an example of an azimuth polar coordinate diagram of the one shown in FIG. 1. FIG.

[Explanation of symbols]

 1 Equatorial plate 2 Assembly hole 4 1st assembly plate 5 2nd assembly plate 6 3rd assembly plate 7 4th assembly plate 8 Bottom 9 Recess 10 Convex 12,13 Slit 21,22,23,24 Corner reflector 31 With a reinforcing plate A certain top plate 32 Base plate which is a reinforcing plate 41 Reflector 42 Pole 50 Corner reflector for radar

Claims (1)

[Claims] 1. A square equatorial plate, at least one surface of which is a radio wave reflecting surface, has assembly holes penetrating along two diagonals of the square equatorial plate. The first, second, third, and fourth portions each having a concave portion and a convex portion formed on the bottom sides of the isosceles triangle, which are sides facing each other at a right angle, and at least one surface of which is a radio wave reflecting surface.
In the assembly plate, the first and second assembly plates have slits that run perpendicularly to the respective bases from respective right-angled vertices to respective central portions, and the third and fourth
The assembly plate has a slit that runs perpendicular to each of the bases from the midpoint of each of the bases to the center of each, and each convex portion of the first and second assembly plates has the equatorial plate. In the mounting hole along one diagonal line, the first and second assembly plates are integrally coupled with the equatorial plate by concave and convex fitting, and the slit of the third assembly plate is The protrusions of the third assembly plate are meshed with the slits of the first assembly plate, the protrusions of the third assembly plate are passed through the mounting holes along the other diagonal line of the equatorial plate, and the slits of the fourth assembly plate are the second assembly plate. The projections of the fourth assembly plate are also meshed with the slits of the plate, the projections of the fourth assembly plate are also penetrated through the mounting holes along the other diagonal line of the equatorial plate, and the third and fourth assembly plates also sandwich the equatorial plate. Integral with concave and convex fitting in the state Is engaged, the first, second, third
And the fourth assembly plate and the equator plate form eight corner reflectors, and each of the three corner reflectors constitutes two arbitrary corner reflectors that are located in point symmetry with respect to the center point of the equator plate. The plate pieces are joined together by a reinforcing plate, and the two corner reflectors are respectively reinforced by the reinforcing plate. The reinforcing plate, the first, second, and
A reflector is constructed by the third and fourth assembly plates and the equatorial plate, and a pole is penetrated through the central portion of the reflector and the reinforcing plate, and the reflector is rotatably attached to the pole. At the same time, the first, second, third and fourth assembly plates and the equatorial plate are respectively arranged with respect to the pole.
A corner reflector for radar that is tilted 5 degrees.