A lightweight reflector with adjustable RCS rotation and a control method thereof

Abstract

The present invention discloses a lightweight reflector with adjustable RCS rotation and a control method thereof. The reflector comprises two layers of reflector components that are fixedly connected in a mirror relationship with each other; each reflector component comprises n reflector units that are connected to each other, and n is a positive integer greater than or equal to 6; the two layers of reflector components are correspondingly connected through n supporting points of each layer; the reflector is used to rotate 360 ​​degrees about the rotation axis as a whole, and the RCS can be controlled by rotating at different angles. The problem that the corner reflector array in the prior art cannot control the scattering characteristics according to the electromagnetic environment and requirements is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of radars, and in particular relates to a lightweight reflector with adjustable RCS rotation and a control method thereof. Background Art

[0002] Existing reflector products often have fixed structural dimensions and heavy weight. When faced with different scattering characteristics, existing reflector products cannot meet the requirements of light weight and easy loading, and cannot achieve the purpose of regulating RCS. If this method is still used, it cannot meet the complex and changeable requirements for scattering characteristics. With the continuous improvement of radar detection capabilities, there is an urgent need for lightweight RCS-adjustable corner reflector arrays to supplement the characteristics that the above-mentioned existing corner reflector products do not have, so as to achieve effective regulation of radar echoes.

[0003] Some existing corner reflector arrays are single-layer arrays formed by a combination of tetrahedral structures made of K9 glass. Six corner reflector units are seamlessly connected to form a hexagonal structure. The overall weight is large and it is not easy to load and transport. At the same time, the reflective surface is usually silver-coated, which greatly increases the manufacturing cost.

[0004] There are also some corner reflector arrays with fixed structural dimensions, and their RCS is not adjustable or has a small adjustable range. The overall array is formed by arranging circular corner reflectors as basic units, with adjacent elements in each layer of corner reflector array arranged at 60° intervals, and adjacent elements in the upper and lower layers are arranged at 30° intervals in turn. This type of corner reflector array only has the function of omnidirectional reflection and cannot adjust the size of RCS, that is, it cannot adjust RCS according to the required scattering characteristics. Summary of the invention

[0005] The object of the present invention is to provide a lightweight reflector with adjustable RCS rotation and a control method thereof, so as to solve the problem that the corner reflector array in the prior art cannot adjust the scattering characteristics according to the electromagnetic environment and requirements.

[0006] The present invention adopts the following technical scheme: a lightweight reflector with adjustable RCS rotation, comprising two layers of reflector components fixedly connected in a mirror relationship with each other; each reflector component comprises n reflector units connected to each other, where n is a positive integer greater than or equal to 6; each reflector unit is a triangular trihedral corner reflector, each reflector unit has an aperture surface with an open top and a side surface with a metal wire mesh, the three endpoints of each aperture surface are boundary vertices, and the vertex of each reflector unit is a support point;

[0007] The connection form of the n reflector units is: six reflector units are spliced ​​to form a regular hexagonal splicing interface diameter surface with the same aperture opening direction; or, with the regular hexagonal splicing interface diameter surface as the center, the remaining reflector units are sequentially and alternately connected at each boundary vertex outside the central regular hexagon, until the newly formed splicing interface diameter surface forms a regular polygon;

[0008] The two layers of reflector components are connected correspondingly through n supporting points of each layer;

[0009] A lightweight reflector with adjustable RCS rotation is used for overall rotation of 360° about a rotation axis, and the RCS can be controlled by rotating at different angles.

[0010] Furthermore, let the axis passing through the center points of the two joint diameter surfaces be L1, let the line passing through the two boundary vertices in the two-layer reflector assembly be L2, and the two boundary vertices are mirror-symmetrical about the plane where all the support points are located, and the line passing through the midpoint of L1 and the midpoint of L2 is the rotation axis.

[0011] Furthermore, when n=6, the boundary vertices of the six reflector units are connected to each other, and the six aperture surfaces are located in the same plane and spliced ​​into a regular hexagon with the same opening direction.

[0012] Furthermore, adjacent boundary vertices are connected by an upper chord, and adjacent boundary vertices and supporting points are connected by support rods. The angle between the upper chord and the support rod is 45°, the angle between every two support rods is 90°, and the size ratio of the upper chord to the support rod is 1:0.688.

[0013] Furthermore, adjacent upper chord connections, adjacent support rod connections, and adjacent upper chord and support rod connections are fixedly connected by a joint structure made of resin material.

[0014] Furthermore, the upper chord rod and the support rod are hollow carbon fiber rods.

[0015] Furthermore, the metal mesh is gold-plated molybdenum wire, gold-plated iron wire or stainless steel wire, the wire diameter of the metal mesh is 0.02mm-0.5mm, and the mesh diameter is 3mm-10mm. The second technical solution adopted by the present invention is a control method for a lightweight reflector with adjustable RCS rotation, which is based on a lightweight reflector with adjustable RCS rotation, and the control method includes the following contents:

[0016] Connecting a driving device to the two selected boundary vertices on the axis L2, the driving device is used to drive a lightweight reflector with adjustable RCS rotation to rotate 360° about the rotation axis as a whole;

[0017] With the two splicing interface radial surfaces as the main scattering surfaces, the overall rotation direction is controlled by a driving device. The splicing interface radial surfaces will be aligned with the incoming wave direction at an angle corresponding to the required RCS. The rotation direction of the corner reflector array is adjusted according to different electromagnetic requirements, thereby achieving RCS control.

[0018] The beneficial effects of the present invention are as follows: the present invention is based on the corner reflector unit, performs a specific structural design and unit combination to form a specific array structure, and through the overall rotation of the designed corner reflector array, the target scattering characteristics are changed according to requirements, and the RCS adjustable range is achieved to be more than 20dB, such as Figure 6-8 As shown in the RCS curve, RCS fluctuates with the change of the incident wave angle, and the adjustable range is as large as 20dB or more, with excellent control effect, and can meet the product's loading space and load requirements with the great advantage of light weight. The present invention has the characteristics of light weight, easy transportation and loading, and can meet the RCS adjustable effect of the corner reflector array to detect the incoming wave through its own rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a corner reflector unit of a lightweight reflector with adjustable RCS rotation according to the present invention;

[0020] Figure 2 It is a structural schematic diagram of the joint diameter surface of one layer of corner reflector components of a lightweight reflector with adjustable RCS rotation when n=6 according to the present invention;

[0021] Figure 3 This is a schematic structural diagram of a corner reflector assembly in one layer of a lightweight reflector with adjustable RCS rotation when n=6;

[0022] Figure 4 It is a schematic diagram of the three-dimensional structure of a lightweight reflector with adjustable RCS rotation according to the present invention;

[0023] Figure 5 It is a structural schematic diagram of the joint diameter surface of one layer of corner reflector components of a lightweight reflector with adjustable RCS rotation when n=24 according to the present invention;

[0024] Figure 6 The curve relationship diagram of the RCS obtained from the experiment at 4 GHz and 6 GHz as the incident wave angle changes;

[0025] Figure 7 is a comparison diagram of RCS curves of the embodiment at 4 GHz;

[0026] Figure 8 is a comparison diagram of RCS curves of the embodiment at 6 GHz;

[0027] Fig. 91 is a comparison diagram of RCS curves of the embodiment at different frequencies.

[0028] Among them, 1. upper chord, 2. support rod, 3. boundary vertex, 4. support point. DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] The present invention provides a lightweight reflector with adjustable RCS rotation, such as Figure 4 As shown, it includes two layers of reflector components that are fixedly connected in a mirror image relationship. The lower layer has the same composition as the upper layer, but is in a mirror symmetric relationship with the first layer. Figure 3 As shown, each layer of reflector assembly includes n reflector units connected to each other, where n is a positive integer greater than or equal to 6. Figure 1 As shown, each reflector unit is a triangular three-sided corner reflector, each reflector unit has an aperture surface with an open top and a side surface with a metal mesh, the three endpoints of each aperture surface are boundary vertices 3, and the vertex of each reflector unit is a support point 4. Specifically, each reflector unit is a triangular pyramid structure with an open bottom surface and three side surfaces, each side surface is provided with a metal mesh; the bottom surface is the aperture surface, the three endpoints of the aperture surface are boundary vertices 3, and the vertex of the reflector unit is a support point 4. Each corner reflector unit has a surface composed of three edges of the same length as the aperture surface, and four joint structures are responsible for connecting the upper chord rod and the support rod. Except for the aperture surface, the other surfaces are evenly covered with metal mesh as lightweight reflective surfaces.

[0031] The connection form of n reflector units is: six reflector units are spliced ​​to form a regular hexagonal splicing interface diameter surface with the same aperture opening direction; or, with the regular hexagonal splicing interface diameter surface as the center, the remaining reflector units are sequentially and alternately connected at each boundary vertex 3 outside the central regular hexagon, until the splicing interface diameter surface forms a regular polygon. Wherein, no matter how much the number n of reflector units is, the surface where each aperture surface forming a regular polygon is obtained by splicing each layer is called the splicing interface diameter surface. For the splicing interface diameter surface, the number n of reflector units is at least six, which can be spliced ​​to form a regular hexagon; if n>6, with the regular hexagonal aperture surface as the center, the remaining number of reflector units must just surround the aperture surface at the center to form a regular polygonal splicing interface diameter surface. The number of circles m can be one or more circles.

[0032] To illustrate the arrangement principle of multiple corner reflector units, Figure 5 Taking the aperture surface of the upper array shown in the figure as an example, the arrangement is as follows: the arrangement is centered on a regular hexagon and increases in number of circles, such as Figure 5The dotted line shows the second circle of corner reflector units. By analogy, each additional circle is the outermost circle of corner reflector units. When the entire corner reflector array has m circles, the number of corner reflector units is 6m. 2 Since the new corner reflector array proposed in the present invention is a mirror-symmetrical structure of the upper and lower layers, the number of units of the entire corner reflector array is 12m 2 At this time, the position connected to the driving motor is any two vertices on the boundary of the overall array aperture surface that are in mirror symmetry, and the joints can be installed for connection.

[0033] The two layers of reflector components are connected correspondingly through n supporting points 4 of each layer. A lightweight reflector with adjustable RCS rotation operates in the 4-6 GHz frequency band and is used for overall rotation 360° about a rotation axis to achieve RCS regulation.

[0034] In some embodiments, the axis passing through the center points of the two joint diameter surfaces is set as L1, and the line passing through any two boundary vertices 3 in the two-layer reflector assembly is set as L2, and L2 is coplanar and parallel to L1. These two boundary vertices 3 should be mirror-symmetrical about the plane where all support points 4 are located, and the line passing through the midpoint of L1 and the midpoint of L2 is the rotation axis.

[0035] In some embodiments, Figure 2 As shown, when n=6, the boundary vertices 3 of the six reflector units are connected to each other, and the six aperture surfaces are located in the same plane and spliced ​​into a regular hexagon with the same opening direction. Because the aperture surface formed by the combination is a regular hexagon, the electromagnetic wave receiving capacity formed in each direction of the aperture surface is equivalent. The present invention includes, but is not limited to, 12 corner reflector units, one or more of which can be taken out and used. Based on the array embodiment composed of 12 units of the present invention, it can still be arranged as follows: Figure 5 The same corner reflector unit can be added in a two-layer mirror structure, which can also achieve RCS rotation control effect and lightweight. For one or several units, the technology, especially lightweight technology, is still applicable.

[0036] In some embodiments, adjacent boundary vertices 3 are connected by an upper chord rod 1, and the boundary vertex 3 and the support point 4 are connected by a support rod 2. The angle between the upper chord rod 1 and the support rod 2 is 45°, and the angle between every two support rods is 90°. The size ratio of the upper chord rod 1 to the support rod 2 is 1:0.688. The RCS rotation adjustable reflector proposed by the present invention is not limited by its size, and can be enlarged or reduced in proportion to the size of the upper chord rod and the support rod. The ratio of the enlargement or reduction is 1:0.688. After the proportional enlargement or reduction, the present invention still has good RCS rotation control effect and lightweight characteristics.

[0037] In some embodiments, the connection points of adjacent upper chord rods 1, adjacent support rods 2, and the connection points of adjacent upper chord rods 1 and support rods 2 are fixedly connected by a joint structure made of resin material. The sleeve in the joint structure is integrated with the joint body part and is formed by 3D printing. The fixed angle ensures the high strength and stability of the overall structure.

[0038] In some embodiments, the upper chord 1 and the support rod 2 are hollow carbon fiber rods, which effectively reduce the weight of the corner reflector array while ensuring high structural strength, making the array lightweight and more easily meeting the requirements of its own rotation and loading and transportation.

[0039] In some embodiments, the metal mesh uses stainless steel wire with a wire diameter of 0.05 mm, and the mesh diameter of the metal mesh is 5 mm, which is suitable for the working frequency band of the present invention. The present invention works under electromagnetic waves with a frequency of 4-6 GHz, which can meet the reflection effect of the metal mesh, and the weight of the metal mesh is much smaller than that of the traditional metal reflective surface.

[0040] The present invention provides a control method for a lightweight reflector with adjustable RCS rotation: a lightweight reflector with adjustable RCS rotation is rotated 360° about the rotation axis as a whole, so as to control the RCS. Let the axis passing through the center points of the two aperture surfaces be L1, let the line passing through the two boundary vertices 3 in the two-layer reflector assembly be L2, these two boundary vertices 3 should be in a mirror symmetric relationship about the plane where all the support points 4 are located, and L2 is coplanar and parallel to L1, and the line passing through the midpoint of L1 and the midpoint of L2 is the rotation axis. The overall rotation is realized by a driving device, and the driving device can be a stepper motor, and the stepper motor is usually connected to the above-mentioned two selected boundary vertices 3 located on the axis L2. During control, the two aperture surfaces are used as the main scattering surfaces, and the rotation direction is controlled by the stepper motor. The aperture surface of the corner reflector array will be aligned with the incoming wave direction at the angle corresponding to the required RCS. The rotation direction of the corner reflector array can be adjusted according to different electromagnetic requirements, so as to achieve the control of RCS. Among them, when the aperture surface of the corner reflector array is perpendicular to the incoming wave direction, the single-station RCS reaches the maximum; when the angle between the incoming wave direction and the aperture surface is between 70 degrees and 90 degrees, the single-station RCS reaches the minimum.

[0041] Before the regulation, a lightweight reflector with adjustable RCS rotation was simulated and experimentally verified to obtain a one-to-one correspondence between RCS (radar cross-section) and the angle of the incident wave, such as Figure 6-8 As shown in the RCS curve, the corresponding relationship can be referred to to adjust the angle of the corner reflector array according to the required RCS to achieve RCS control. It can also be used to interfere with the continuous detection of the radar by rotating. The principle is that when the radar performs continuous detection, the corner reflector array can actively adjust the angle of the aperture surface so that the radar measures a sometimes large and sometimes small RCS, thereby interfering with its detection.

[0042] When used as a passive interference source, it can make the incoming waves reflect multiple times, resulting in the target's "sometimes appearing and sometimes not appearing" phenomenon. According to the required electromagnetic scattering effect, the array can be rotated to achieve the effects of alternating strong and weak reflections, thereby achieving the purpose of interference; when the array is used to present the required scattering characteristics according to the current electromagnetic environment and requirements, it is also necessary to rotate it according to the required rotation conditions to achieve the required electromagnetic scattering characteristics. Thanks to the lightweight structure of the new rotationally adjustable RCS corner reflector array, the above forms can be realized conveniently and quickly, and can achieve the required purpose. Experiments have shown that the present invention has stable performance during use, is easy to use, has a high space utilization rate, and the product process is simple to implement and mature in assembly, and can better meet different needs for variable scattering characteristics.

[0043] Example

[0044] The array includes 12 corner reflector units, wherein the length dimensions of the upper chord rod 1 and the support rod 2 of each unit are 453mm and 311.83mm respectively, and the outer diameter is 5mm. The outer diameter of the sleeve in the joint structure is 7mm and the inner diameter is 5mm. The array skeleton is composed of a carbon fiber hollow rod and a joint structure. The reflective surface is fixed on each carbon fiber rod of the corner reflector array by a metal wire mesh with a diameter of 0.05mm through a special adhesive. The carbon fiber hollow rod, the joint structure and the metal wire mesh reflective surface ensure the light weight and high structural strength characteristics of the corner reflector array proposed by the present invention. The conventional corner reflector array weighs several kilograms or even tens of kilograms because the reflective surface is made of metal, while the entire device of the present invention weighs only 0.675Kg, which proves its advantage of being lightweight. Through theoretical calculation and electromagnetic simulation, combined with factors such as manufacturing process, the optimal sizes of the upper chord and support rod are 453mm and 311.83mm respectively. At the same time, through experimental verification, according to the different simulated scattering characteristics requirements, the corner reflector array can show excellent RCS control effect.

[0045] Based on the above embodiments, the following analysis is made and it is obtained Figure 6-Figure 8 The results:

[0046] First, the experimental results of the new corner reflector array are given. Since the operating frequency band is 4-6 GHz, 4 and 6 GHz are selected for explanation as follows Figure 6 .from Figure 6It can be seen that the present invention can clearly see in the experiment that the RCS curve shows a regular fluctuation phenomenon with the incident wave angle, that is, different incident wave angles correspond to different RCS. Under this rule, when the incoming wave (incident wave) direction is determined, the present invention will adjust the angle between the aperture surface and the incoming wave under the action of the driving motor, and obtain different RCS according to the change of the angle. When the required scattering characteristics are to make the radar detect or enhance self-reflection, the aperture surface of the new corner reflector array can be adjusted to obtain a larger RCS; when the required scattering characteristics are to reduce the possibility of radar detection or reduce self-reflection, the aperture surface of the new corner reflector array can also be adjusted to obtain a smaller RCS; when the purpose is to interfere with the continuous detection of the radar, the new corner reflector array can be driven to rotate irregularly, so that the obtained RCS changes irregularly, thereby forming interference. The above results only give the RCS curve with an incident wave range of about 60°. Since the new corner reflector array is a highly symmetrical structure, its range should be 120°, which also proves that it has a wider RCS control range. Figure 7 The comparison of RCS curves at 4 GHz between simulation and experiment is shown in Figure 2. Figure 7 It can be seen that at 4 GHz, the fluctuation shape of the experimental RCS curve is similar to the simulation result within a certain angle range, which can reflect the change of RCS with angle. The error between simulation and experiment is due to the idealization of simulation conditions and the simplification of some structures, and is within an acceptable range.

[0047] Figure 8 The comparison of RCS curves at 6 GHz between simulation and experiment is shown in Figure 2. Figure 8 It can be seen that at 6GHz, the change pattern of RCS with the incident wave angle is more obvious, and its fluctuation effect can better reflect that the corner reflector array has different RCS after rotating in different directions, thus having a regulatory effect.

[0048] Fig. 9 The comparison of RCS curves between simulation and experiment at different frequencies is shown in Figure 2. Fig. 9 It can be seen that the variation of RCS with frequency of the new corner reflector array has been verified in both experiments and simulations, and the variation trend of RCS with frequency is basically consistent.

[0049] Through the above simulation and experimental data, it can be seen that RCS control in different directions is achieved by driving the corner reflector array to a rotating state by a driving motor. Therefore, the RCS rotationally adjustable lightweight reflector of the present invention has obvious RCS control effect, and the adjustable range is large, which can reach 20dB or more. The RCS error between the simulation and experimental data is only a few dB. Considering the idealized conditions during simulation, the RCS control effect of the corner reflector array has been verified.

[0050] The present invention proposes to use a carbon fiber hollow rod with light weight and high structural strength as the supporting skeleton of the corner reflector array, and the joint structure adopts resin material. For the reflective surface, the present invention adopts a metal mesh, which has the same effect as the traditional metal reflective surface, but the weight of the metal mesh is much less than the traditional metal reflective surface, which shows a great advantage in weight. Combined with the carbon fiber hollow rod and the resin joint structure, the new corner reflector array of the present invention has the lightweight feature that existing products and traditional corner reflectors do not have, which greatly facilitates loading, transportation and use.

[0051] The present invention is based on a triangular three-sided corner reflector unit (hereinafter referred to as a corner reflector unit). The corner reflector unit has the function of enhancing reflection. In order to make the corner reflector array aperture surface receive the incoming wave to the maximum extent, that is, to make the corner reflector array aperture surface as evenly distributed as possible, the present invention is designed to arrange the corner reflector unit aperture surface in a regular hexagon, so as to form a considerable electromagnetic wave receiving ability in all directions of the aperture surface. After forming the corner reflector array, the present invention has been verified by simulation and experiment (specific results will be given below). After forming the array, it is no longer a simple enhanced reflection. Its RCS has a one-to-one correspondence with the angle of the incident wave. Therefore, the angle of the corner reflector array can be adjusted according to the required RCS to achieve RCS control. It can also be used to interfere with the continuous detection of the radar by rotation. The principle is that when the radar performs continuous detection, the corner reflector array can actively adjust the orientation angle of the aperture surface so that the radar measures a sometimes large and sometimes small RCS, thereby interfering with its detection.

[0052] A light reflector with adjustable RCS rotation of the present invention achieves the purpose of accurately regulating the RCS of incident electromagnetic waves according to different scattering characteristics in a complex electromagnetic environment by adopting a strategy of rotating corner reflector arrays, that is, through the form of an array, the incoming waves are reflected multiple times, greatly enhancing the RCS of the reflector, and the reflector is aligned with the incoming waves at different angles by a stepper motor to control the rotation of the array, thereby adjusting the RCS size of the corner reflector array. The corner reflector array of the present invention optimizes a lightweight design scheme according to material properties, structural form, etc. under the conditions of meeting the requirements of scattering characteristic indicators and reasonable appearance. Each vertex of the corner reflector array is a corresponding lightweight joint structure, and is made of resin material and is 3D printed. The upper chord rod and the support rod are hollow rods made of carbon fiber materials. The metal reflective wire mesh is woven from wire made of stainless steel material with good shielding performance. The metal wire mesh has the advantages of softness, high elongation, high strength, and not easy to produce creases during the folding process. The RCS rotationally adjustable lightweight corner reflector array designed by the present invention is formed by connecting corner reflector units and has the characteristics of lightness and high strength. It is innovatively proposed to use a metal wire mesh as the reflecting surface of the corner reflector.

Claims

1. A lightweight reflector with adjustable RCS rotation, characterized in that: It comprises two layers of reflector assemblies which are fixedly connected in a mirror-image relationship; each reflector assembly comprises n reflector units which are connected to each other, where n is a positive integer greater than or equal to 6; each reflector unit is a triangular trihedral corner reflector, each of the reflector units has an aperture surface with an open top and a side surface with a metal wire mesh, the three endpoints of each aperture surface are boundary vertices (3), and the vertex of each reflector unit is a support point (4); The connection form of the n reflector units is: six reflector units are spliced ​​to form a regular hexagonal splicing interface diameter surface with the same aperture opening; or, with the regular hexagonal splicing interface diameter surface as the center, the remaining reflector units are sequentially and alternately connected at each boundary vertex (3) outside the central regular hexagon, until the newly formed splicing interface diameter surface forms a regular polygon; The two layers of reflector components are connected correspondingly via n supporting points (4) of each layer; The RCS rotationally adjustable lightweight reflector is used to rotate 360° around a rotation axis as a whole, and the RCS can be adjusted by rotating at different angles.

2. The RCS rotationally adjustable lightweight reflector according to claim 1, characterized in that: Assume that the axis passing through the center points of the two joint diameter surfaces is L1, and the line passing through the two boundary vertices (3) in the two-layer reflector assembly is L2, and the two boundary vertices (3) are in a mirror-symmetrical relationship with respect to the plane where all the support points (4) are located, and the line passing through the midpoint of L1 and the midpoint of L2 is the rotation axis.

3. A lightweight reflector with adjustable RCS rotation as claimed in claim 1 or 2, characterized in that: When n=6, the boundary vertices (3) of the six reflector units are connected to each other, and the six aperture surfaces are located in the same plane and spliced ​​into a regular hexagon with the same opening direction.

4. The RCS rotationally adjustable lightweight reflector as claimed in claim 3, characterized in that: Adjacent boundary vertices (3) are connected via an upper chord rod (1), and adjacent boundary vertices (3) and support points (4) are connected via a support rod (2). The angle between the upper chord rod (1) and the support rod (2) is 45°, and the angle between every two support rods (2) is 90°. The size ratio of the upper chord rod (1) to the support rod (2) is 1:0.

688.

5. The RCS rotationally adjustable lightweight reflector as claimed in claim 4, characterized in that: The connection points of adjacent upper chord rods (1), the connection points of adjacent support rods (2), and the connection points between adjacent upper chord rods (1) and support rods (2) are fixedly connected via a joint structure made of resin material.

6. The lightweight reflector with adjustable RCS rotation as claimed in claim 5, characterized in that: The upper chord rod (1) and the support rod (2) are hollow carbon fiber rods.

7. A lightweight reflector with adjustable RCS rotation as claimed in claim 1 or 2, characterized in that: The metal wire mesh is gold-plated molybdenum wire, gold-plated iron wire or stainless steel wire, the wire diameter of the metal wire mesh is 0.02mm-0.5mm, and the mesh diameter is 3mm-10mm.

8. A method for controlling a lightweight reflector with adjustable RCS rotation, characterized in that: It is based on a lightweight reflector with adjustable RCS rotation as claimed in any one of claims 1 to 7, and its control method includes the following contents: Connecting a driving device to the two selected boundary vertices (3) located on the axis L2, the driving device is used to drive the RCS rotationally adjustable lightweight reflector to rotate 360° about the rotation axis as a whole; With the two splicing interface radial surfaces as the main scattering surfaces, the overall rotation direction is controlled by a driving device. The splicing interface radial surfaces will be aligned with the incoming wave direction at an angle corresponding to the required RCS. The rotation direction of the corner reflector array is adjusted according to different electromagnetic requirements, thereby achieving RCS control.

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