Corner reflector

Abstract

The utility model discloses a corner reflector, which comprises a vertical reflecting piece connected with a carrier used for fixing the corner reflector, and a vertical reflecting piece connected with the carrier used for fixing the corner reflector, the four-direction reflecting parts are connected with the vertical reflecting part and are vertically arranged, the four-direction reflecting parts are arranged in four groups, and two adjacent groups of four-direction reflecting parts are vertically arranged. Through the arrangement of the four groups of corner reflectors, after the corner reflectors are connected with an aerial carrier, the corner reflectors have omnidirectional 180-degree reflection to the ground. Therefore, the aerial carrier does not need to be fixed at a specific position, the angle of the incident electromagnetic wave does not need to be fixed, and the electromagnetic wave can be refracted back according to a specific reflection area in the direction opposite to the incident direction as long as the incident electromagnetic wave is emitted towards the corner reflector.

Description

Technical Field

[0001] The utility model relates to the technical field of radar in the electronics industry, in particular to a corner reflector. Background Art

[0002] Radar reflectors, also known as corner reflectors, are made of sheet metal and come in various sizes depending on the application. When radar electromagnetic waves hit a corner reflector, they are refracted and amplified by the metal corners, producing a strong echo signal that appears as a strong target on the radar screen. They consist of three perpendicular plane mirrors. If incident light is to be reflected in the opposite direction, a corner reflector is required. Current corner reflectors require incident light to be reflected in a specific direction in order to reflect it in the opposite direction. Therefore, both the corner reflector and the light source must be fixed to ensure that the incident light is reflected in the opposite direction. Utility Model Content

[0003] In order to overcome the above-mentioned shortcomings, the purpose of the present invention is to provide a corner reflector, and the positions of the corner reflector and the light source do not need to be fixed.

[0004] In order to achieve the above objectives, the technical solution adopted by the present invention is: a corner reflector, comprising:

[0005] A vertical reflector connected to a carrier for fixing the corner reflector;

[0006] The four-directional reflective element is connected to the vertical reflective element and is vertically arranged. There are four groups of four-directional reflective elements, and two adjacent groups of four-directional reflective elements are vertically arranged.

[0007] By setting up four sets of corner reflectors, when connected to an aerial vehicle, the corner reflectors provide omnidirectional 180-degree reflection to the ground. Therefore, the aerial vehicle does not need to be fixed in a specific position (for example, an aircraft), and the angle of the incident electromagnetic wave does not need to be fixed. As long as the incident electromagnetic wave is emitted in the direction of the corner reflector, it will be refracted back in the opposite direction according to a specific reflection area.

[0008] Furthermore, the four-directional reflector includes two symmetrically arranged four-directional reflective surfaces, the vertical reflector is provided with a vertical reflective surface on one side close to the four-directional reflector, and the two four-directional reflective surfaces and the vertical reflective surface close to each other of two adjacent groups of four-directional reflectors are perpendicular to each other to form a triangular pyramid.

[0009] Furthermore, the four groups of four-directional reflective elements are connected as one body.

[0010] Furthermore, it also includes a fixing base, which is integrally connected to the side of the vertical reflector away from the four-way reflector, and a first threaded hole is set on the fixing base, and the fixing base and the carrier are connected by screws, and thread fastening glue is added to the first threaded hole.

[0011] Furthermore, the four-way reflective member and the vertical reflective member are detachably connected, a through hole is provided on the vertical reflective member, a second threaded hole is provided on the four-way reflective member, and a connecting member passes through the through hole and the second threaded hole for threaded connection.

[0012] Furthermore, a first positioning hole is provided on one side of the vertical reflector close to the four-way reflector, and a second positioning hole is provided on one side of the four-way reflector close to the vertical reflector. The positions of the second positioning hole and the first positioning hole are adapted to each other, and one end of a positioning pin is inserted into the first positioning hole, and the other end is inserted into the second positioning hole.

[0013] Furthermore, the positioning pin and the first positioning hole are interference fit, and the positioning pin and the second positioning hole are also interference fit.

[0014] Furthermore, the vertical reflector and the four-way reflector are made of aluminum alloy.

[0015] Furthermore, a protective film is included, which is arranged on the surface of the vertical reflector and the four-directional reflector, and covers the vertical reflector and the four-directional reflector.

[0016] Furthermore, the thickness of the four-directional reflector is 16 to 18 mm, the surface connecting the vertical reflector and the four-directional reflector is a square, the four-directional reflector is connected to the vertical reflector along the diagonal of the square, the length of the diagonal is 100 to 104 mm, the distance between the upper side of the vertical reflector and the lower side of the four-directional reflector is 52 to 56 mm, and the surface roughness of the vertical reflector and the four-directional reflector is 0.8 to 1.6.

[0017] The beneficial effects of the utility model are:

[0018] 1) By setting up four sets of corner reflectors, when connected to an aerial vehicle, the corner reflectors provide omnidirectional 180-degree reflection to the ground. Therefore, the aerial vehicle does not need to be fixed in a specific position (for example, an aircraft), and the angle of the incident light does not need to be fixed. As long as the incident light is directed in the direction of the corner reflector, it will be reflected back in the opposite direction.

[0019] 2) By limiting the size and roughness of the diagonal reflectors, the RCS can be maintained within 0.01-0.1 square within the 8-18 GHz frequency range. This allows radars to distinguish friend from foe using RCS values in combat radio silence. Furthermore, using RCS within a specific range allows radars to accurately identify friendly aircraft in non-combat situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A perspective view of a corner reflector according to an embodiment of the present invention;

[0023] Figure 2 A three-dimensional diagram of a four-way reflector according to an embodiment of the present invention;

[0024] Figure 3 This is a front view of a corner reflector according to an embodiment of the present invention;

[0025] Figure 4 A bottom view of a corner reflector according to an embodiment of the present invention;

[0026] Figure 5 This is a simulation diagram of the corner reflector design of an embodiment of the present invention.

[0027] In the figure: 1, vertical reflector; 11, through hole; 12, vertical reflector surface; 2, four-way reflector; 21, first reflector surface; 22, second reflector surface; 3, fixing seat; 31, first threaded hole; 4, connecting piece; 5, positioning pin. DETAILED DESCRIPTION

[0028] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] In this document, the term "and / or" simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document, unless otherwise specified, generally indicates an "or" relationship between the related objects.

[0030] See attached Figure 1 and 2 As shown, a corner reflector in this embodiment includes a vertical reflector 1 and a four-directional reflector 2. The vertical reflector 1 and the four-directional reflector 2 are made of aluminum alloy, such as 2024 aluminum alloy or Al-Cu-Mg aluminum alloy. Aluminum alloy is primarily used to make various high-load parts and components, can be heat-treated and strengthened, and has moderate plasticity in the quenched and as-quenched states. Aluminum alloy has a low density, making the weight of a single corner reflector less than 500g. After the vertical reflector 1 and the four-directional reflector 2 are connected, an oxide coating is applied to the surfaces of the vertical reflector 1 and the four-directional reflector 2 to form a protective film on the surfaces of the vertical reflector 1 and the four-directional reflector 2. The corner reflector can meet the requirements of a 48H neutral salt spray test.

[0031] The four-way reflector 2 and the vertical reflector 1 are arranged vertically, and the vertical reflector 1 is connected to a carrier for fixing the corner reflector. Specifically, a fixing seat 3 is provided on the side of the vertical reflector 1 away from the four-way reflector 2. To ensure a more secure connection between the fixing seat 3 and the vertical reflector 1, the vertical reflector 1 and the fixing seat 3 are integrally connected. A first threaded hole 31 is provided on the fixing seat 3, and the fixing seat 3 and the carrier are connected by screws. The fixing seat 3 and the corner reflector are then fixed and connected by the carrier. During the connection process, thread fastener glue is added to the first threaded hole 31 to enhance the firmness of the threaded connection and ensure that the corner reflector can withstand wind, vibration, and shock waves.

[0032] In some embodiments, the four-way reflector 2 and the vertical reflector 1 are detachably connected. Specifically, the vertical reflector 1 is provided with a through hole 11, the four-way reflector 2 is provided with a second threaded hole, and the connecting member 4 is threadedly connected through the through hole 11 and the second threaded hole. The connecting member 4 is a bolt or a screw.

[0033] In some embodiments, a first positioning hole is provided on the side of the vertical reflector 1 proximate to the four-way reflector 2. Correspondingly, a second positioning hole is provided on the side of the four-way reflector surface proximate to the vertical reflector 12. The second positioning hole and the first positioning hole are aligned. A positioning pin 5 has one end inserted into the first positioning hole and the other end inserted into the second positioning hole. The provision of the first and second positioning holes and the positioning pin 5 enhances the secure connection between the four-way reflector 2 and the vertical reflector 1.

[0034] In some embodiments, the positioning pin 5 is interference-fitted with the first positioning hole and the second positioning hole, thereby improving the firmness of the connection between the vertical reflector 1 and the four-way reflector 2, enhancing the connection rigidity between the vertical reflector 1 and the four-way reflector 2, and reducing the swing and deformation of the four-way reflector 2 under the action of wind.

[0035] See attached Figure 2-4 As shown, in some embodiments, the four-directional reflective elements 2 are provided in four groups, and two adjacent groups of reflective elements are arranged vertically. Each group of four-directional reflective elements 2 includes two four-directional reflective surfaces arranged symmetrically on the left and right. The vertical reflective element 1 is provided with a vertical reflective surface 12 on the side close to the four-directional reflective element 2. The two four-directional reflective surfaces close to each other and the vertical reflective surface 12 of the two adjacent groups of four-directional reflective elements 2 are perpendicular to each other to form a triangular pyramid, which can reflect electromagnetic waves. Exemplarily, the four-directional reflective element 2 includes a first reflective surface 21 and a second reflective surface 22. The first reflective surface 21 of the same four-directional reflective element 2 is located clockwise from the second reflective surface 22. The first reflective surface 21, the second reflective surface 22 and the vertical reflective surface 12 are perpendicular to the first reflective surface 21 and the second reflective surface 22 of the four-directional reflective element 2 perpendicular to the first reflective surface 21 are arranged perpendicularly. The first reflective surface 21, the second reflective surface 22 of the four-directional reflective element 2 perpendicular to the first reflective surface 21, and the vertical reflective surface 12 are perpendicular to each other to form a triangular pyramid, that is, a triangular trihedral corner reflector.

[0036] Although the maximum radar cross-section (RCS) and average radar cross-section (RCS) of a triangular trihedral corner reflector are smaller than those of a circular trihedral corner reflector and a square trihedral corner reflector, the triangular trihedral corner reflector has the widest broadband radiation pattern (40° for a triangular trihedral corner reflector, 32° for a circular trihedral corner reflector, and 25° for a normal direction trihedral corner reflector). This means that when the angle of incidence changes, the rate of reduction of the RCS of the triangular trihedral corner reflector is the smallest, enabling it to achieve greater echo power over a wider range of incident angles. Considering that the incident direction of electromagnetic waves will inevitably deviate to a certain degree during actual use, triangular trihedral corner radar reflectors are often used in actual engineering and tactical applications. Furthermore, the radar cross-section (RCS) required for this technology is 0.01 to 0.1 squared, so the triangular shape is the best choice in terms of performance and weight.

[0037] The arrangement of four sets of four-directional reflectors 2 forms four triangular pyramids, increasing the angle range of the corner reflector's reception and reflection of incident geomagnetic waves. When the corner reflector is fixed in mid-air by a carrier, it can provide omnidirectional 180-degree reflection toward the ground. Therefore, the aerial carrier does not need to be fixed in a specific position (for example, an aircraft), and the angle of the incident light does not need to be fixed. As long as the incident light is directed toward the corner reflector, it can be reflected back in the opposite direction of its original direction.

[0038] In some embodiments, four groups of four-directional reflective elements 2 are integrally connected, thereby increasing the firmness of the corner reflector.

[0039] In some embodiments, the thickness of the four-directional reflector 2 is 17 mm, the surface connecting the vertical reflector 1 and the four-directional reflector 2 is a square, the four-directional corner reflector is connected to the vertical reflector 1 along the diagonal of the square, the length of the diagonal is 102 mm, that is, the maximum width of the corner reflector is 102 mm, the distance between the upper side of the vertical reflector 1 and the lowest surface of the four-directional reflector 2 is 54 mm, the surface roughness of the vertical reflector 1 and the four-directional reflector 2 is 0.8 to 1.6, according to the RCS calculation formula of the triangular corner reflector RCSmax = b 4 / 3λ 2 (λ is the radar wavelength, b is the length of the right angle side of the corner reflector), the scattering characteristics of the corner reflector are inversely proportional to the square of the radar wavelength. In different frequency bands, the RCS magnitude of the same corner reflector is different. See the attached Figure 5 As shown, the above-mentioned size and roughness settings can achieve an RCS within 0.01-0.1 square within the 8-18 GHz frequency range. Furthermore, in the friend-or-foe identification system, radar can use RCS values to distinguish friend from foe in combat radio silence. Furthermore, using RCS values within a specific range allows us to accurately identify stealth fighters even in non-combat situations.

[0040] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0041] The above implementation methods are only for illustrating the technical concept and features of the utility model. Its purpose is to enable people familiar with this technology to understand the content of the utility model and implement it. It cannot be used to limit the scope of protection of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the scope of protection of the utility model.

Claims

1. A corner reflector, characterized in that: include: A vertical reflector (1), the vertical reflector (1) being connected to a carrier for fixing a corner reflector; Four-directional reflective elements (2), the four-directional reflective elements (2) and the vertical reflective elements (1) are connected and arranged vertically, the four-directional reflective elements (2) are arranged in four groups, and two adjacent groups of four-directional reflective elements (2) are arranged vertically; It also includes a fixing seat (3), the fixing seat (3) and the side of the vertical reflector (1) away from the four-way reflector (2) are integrally connected, a first threaded hole (31) is provided on the fixing seat (3), and the fixing seat (3) and the carrier are connected by screws.

2. A corner reflector according to claim 1, characterized in that: The four-directional reflective element (2) comprises two symmetrically arranged four-directional reflective surfaces, the vertical reflective element (1) is provided with a vertical reflective surface (12) on one side close to the four-directional reflective element (2), and the two four-directional reflective surfaces and the vertical reflective surface (12) close to each other of two adjacent groups of four-directional reflective elements (2) are perpendicular to each other to form a triangular pyramid.

3. The corner reflector according to claim 1, wherein: The four groups of four-directional reflective elements (2) are connected as one body.

4. The corner reflector according to claim 1, wherein: Thread fastening glue is added into the first threaded hole (31).

5. The corner reflector according to claim 1, wherein: The four-directional reflective element (2) and the vertical reflective element (1) are detachably connected, a through hole (11) is provided on the vertical reflective element (1), a second threaded hole is provided on the four-directional reflective element (2), and the connecting element (4) passes through the through hole (11) and is threadedly connected to the second threaded hole.

6. The corner reflector according to claim 1, characterized in that: A first positioning hole is provided on a side of the vertical reflector (1) close to the four-directional reflector (2), and a second positioning hole is provided on a side of the four-directional reflector (2) close to the vertical reflector (1). The positions of the second positioning hole and the first positioning hole are adapted to each other, and one end of a positioning pin (5) is inserted into the first positioning hole, and the other end is inserted into the second positioning hole.

7. The corner reflector according to claim 6, characterized in that: The positioning pin (5) and the first positioning hole are interference fit, and the positioning pin (5) and the second positioning hole are also interference fit.

8. The corner reflector according to claim 1, wherein: The vertical reflector (1) and the four-way reflector (2) are made of aluminum alloy.

9. The corner reflector according to claim 1, characterized in that: It also includes a protective film, which is arranged on the surface of the vertical reflector (1) and the four-directional reflector (2), and the protective film covers the vertical reflector (1) and the four-directional reflector (2).

10. A corner reflector according to any one of claims 1 to 9, characterized in that: The thickness of the four-directional reflector (2) is 16-18 mm, the surface where the vertical reflector (1) and the four-directional reflector (2) are connected is a square, the four-directional reflector (2) is connected to the vertical reflector (1) along the diagonal of the square, the length of the diagonal is 100-104 mm, the distance between the upper side of the vertical reflector (1) and the lower side of the four-directional reflector (2) is 52-56 mm, and the surface roughness of the vertical reflector (1) and the four-directional reflector (2) is 0.8-1.6.

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