CN216251155U

CN216251155U - RCS adjustable reflector capable of being unfolded and folded

Info

Publication number: CN216251155U
Application number: CN202122790903.2U
Authority: CN
Inventors: 宗亚雳; 李帅鹏; 李长侑; 张铎; 王杰; 吕昂; 史文璐
Original assignee: Northwestern Polytechnical University
Current assignee: Northwestern Polytechnical University
Priority date: 2021-11-15
Filing date: 2021-11-15
Publication date: 2022-04-08
Anticipated expiration: 2031-11-15

Abstract

The utility model discloses an RCS adjustable reflector capable of being unfolded and folded, which comprises a layer of reflector assembly and another layer of reflector assembly arranged in a mirror image mode, wherein each reflector assembly comprises n reflector units which are connected with each other, and n is a positive integer greater than or equal to 6; the two layers of reflector components are correspondingly hinged through n supporting points of each layer to form a movable structure; each layer of reflector assembly is provided with an unfolding-folding mechanism which is used for unfolding or folding the whole foldable and foldable RCS adjustable reflector about an unfolding-folding axis, wherein the unfolding-folding axis is a connecting line passing through the centers of two spliced caliber surfaces, and the RCS can be adjusted and controlled by different unfolding degrees of the spliced caliber surfaces. The problem of among the prior art product structure volume fixed, can't carry out RCS regulation and control or have the RCS regulation and control in very little scope is solved.

Description

RCS adjustable reflector capable of being unfolded and folded

Technical Field

The utility model belongs to the technical field of radars, and particularly relates to an RCS adjustable reflector capable of being unfolded and folded.

Background

With the current electromagnetic environment becoming more complex, electronic countermeasures are developing faster and faster, with the development of reflectors becoming unable to keep pace with demand. The existing reflector products often have fixed size, volume and larger weight, have the defects of inconvenience, heavy weight and the like in use and transportation, cannot meet the requirements of convenient transportation, loading and lightening, and often do not have the capacity of RCS regulation after the size and the volume are fixed, and cannot meet the requirements of different scattering properties in the complex electromagnetic environment and the requirements of convenient use, transportation and loading.

Some existing reflector products mostly use metal planes or other materials as the material of the reflecting surface, and arrange a plurality of reflector units, which are difficult to change once they determine the structure (existing reflector products), so that the overall weight is large, and the excessive volume brings great difficulty for use, transportation and loading.

There are also a few reflector products that have RCS regulation capability, but generally have complex structures and large volumes, and the range of regulation is small due to the fixed volumes and structures. For the existing reflector product, when different scattering characteristics need to be realized, different reflector products need to be selected, and if the traditional mode is still used, the complex and variable requirements on the scattering characteristics cannot be met, so that the problem that the target scattering characteristics cannot be changed in time is caused. Therefore, the existing reflector has the defects that the product structure is fixed in size, and RCS regulation cannot be carried out or RCS regulation in a small range is realized.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an RCS adjustable reflector capable of being unfolded and folded so as to solve the problems that the product in the prior art is fixed in structure and volume, cannot be regulated and controlled or has RCS regulation and control within a small range.

The utility model adopts the following technical scheme: an RCS adjustable reflector capable of being unfolded and folded comprises a reflector assembly and another reflector assembly arranged in a mirror image mode, wherein each reflector assembly comprises n reflector units which are connected with each other, and n is a positive integer greater than or equal to 6;

each reflector unit is a triangular three-sided corner reflector, each reflector unit is provided with an aperture surface with an opening at the top and a side surface provided with a metal wire mesh, three end points of each aperture surface are boundary vertexes, the vertexes of each reflector unit are supporting points, adjacent boundary vertexes are hinged through two upper chords, the adjacent boundary vertexes and the supporting points are connected through supporting rods, and the two upper chords are connected through a folding joint to form a foldable structure;

the connection form of the n reflector units is as follows: splicing six reflector units to form a regular hexagon splicing radial surface with the same opening orientation of the radial surface; or, with the splicing diametral plane of the regular hexagon as the center, the other reflector units are sequentially and alternately connected to the boundary vertexes on the periphery of the central regular hexagon in a positive-negative mode until the splicing diametral plane forms a regular polygon;

the two layers of reflector components are correspondingly hinged through n supporting points of each layer to form a movable structure;

each layer of reflector assembly is provided with an unfolding-folding mechanism which is used for unfolding or folding the whole foldable and foldable RCS adjustable reflector about an unfolding-folding axis, wherein the unfolding-folding axis is a connecting line passing through the centers of two spliced caliber surfaces, and the RCS can be adjusted and controlled by different unfolding degrees of the spliced caliber surfaces.

Further, the unfolding-folding mechanism on each layer of reflector assembly comprises:

a plurality of roller joints (10) which are positioned at each boundary vertex of the outermost ring of the splicing caliber surface and comprise a roller structure and a movable sleeve structure; the roller structure comprises a U-shaped roller support, a pin shaft and a roller are arranged at an opening of the roller support in parallel at intervals, and a threading gap is reserved between the pin shaft and the roller; the movable sleeve structure is provided with a plurality of sleeves which are respectively hinged with the upper chord and the supporting rod;

one end of the thin metal rope is fixed on any one roller support, and the other end of the thin metal rope passes through the threading gaps of the roller supports in sequence and is finally led out from the threading gaps in the roller supports fixed by the thin metal rope;

and the stepping motor is connected with the leading-out end of the thin metal rope and is used for dragging the thin metal rope through the external force of the stepping motor so as to contract the splicing caliber surface.

Further, the size ratio of the upper chord to the support rod is 1: 1.477, in the fully unfolded state, the included angle between the adjacent upper chord and the supporting rod is 45 degrees, and the included angle between every two supporting rods is 90 degrees.

Furthermore, the joints of the adjacent upper chords and the upper chords, the joints of the adjacent upper chords and the supporting rods, and the joints of the adjacent supporting rods and the supporting rods are hinged through joint structures made of aluminum magnesium alloy materials.

Further, when n is 6, the boundary vertices of the six reflector units are connected with each other, and the six aperture surfaces are spliced into a regular hexagon with the same opening direction.

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

Furthermore, the wire mesh is a gold-plated molybdenum wire, a gold-plated iron wire or a stainless steel wire, the wire diameter of the wire mesh is 0.02mm-0.5mm, and the mesh diameter is 3mm-10 mm.

The utility model has the beneficial effects that: the utility model takes the triangular three-sided corner reflector unit as the basis, carries out specific structural design and unit combination to form a specific array structure, and the reflector can realize that the scattering property of a target changes according to requirements under different unfolding and folding states and can also conveniently realize the unfolding and folding operation, thereby realizing the RCS regulation and control effect. As shown in fig. 6 and 7, the RCS curve varies with the frequency under different unfolding and folding states (

states

1, 2, 3, and 4), it can be seen that the RCS adjustable range is as high as approximately 30dB, and the adjustable range is large. In addition, the utility model realizes the variable volume operation which can not be realized by the traditional corner reflector by virtue of the unfolding and folding mechanism, which greatly facilitates the loading, transportation and use of the reflector, for example, when in need of transportation, the reflector can be completely folded, and meanwhile, the carbon fiber hollow rod and the metal wire mesh greatly reduce the weight of the reflector, thereby not only facilitating the loading and transportation,

drawings

Fig. 1 is a schematic structural view of a corner reflector unit of an RCS adjustable reflector of the present invention which can be unfolded and folded;

fig. 2 is a schematic structural diagram of a splicing diametric plane of a corner reflector assembly of one layer when n is 6, in an expandable-collapsible RCS adjustable reflector of the present invention;

fig. 3 is a schematic structural diagram of a foldable RCS tunable reflector of the present invention, where n is 6, and a layer of corner reflector assembly is shown;

FIG. 4 is a schematic perspective view of a deployable and collapsible RCS tunable reflector two-layer corner reflector assembly in accordance with the present invention;

fig. 5 is a schematic diagram of a split joint of the aperture surfaces of one layer of corner reflector assembly when n is 24 in an RCS adjustable reflector of the present invention;

FIG. 6 is a graph showing the variation of RCS with frequency in the state 1 and the state 2 of the unfolding and folding degree according to the embodiment of the present invention;

FIG. 7 is a graph of the variation of RCS with frequency for the embodiment of the present invention in the expanded and collapsed

states

3 and 4;

FIG. 8 is a schematic view of an expandable-collapsible RCS tunable reflector according to the present invention at a view angle of a splicing caliber;

FIG. 9 is a schematic view of the state of the thin metal cord of an RCS adjustable reflector of the present invention passing through the joint of the drum in an unfolded and folded state;

fig. 10 is a schematic view of an RCS tunable reflector of the present invention in a fully collapsed state.

The device comprises an upper chord 1, a support rod 2, a boundary vertex 3, a support point 4, a folding joint 5, a thin metal rope 6, a roller support 7, a roller 8, a pin shaft 9 and a roller joint 10.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

The utility model provides an expandable-collapsible RCS adjustable reflector, which comprises a reflector assembly and another reflector assembly arranged in a mirror image mode as shown in figure 4, wherein each reflector assembly comprises n reflector units which are connected with each other as shown in figure 3, and n is a positive integer greater than or equal to 6. The lower layer has the same structure as the upper layer, but is in mirror symmetry with the first layer.

Each reflector assembly comprises n reflector units connected with each other, as shown in fig. 1, each reflector unit is a triangular three-sided corner reflector, each reflector unit is provided with an aperture surface with an open top and a side surface provided with a wire mesh, three end points of each aperture surface are boundary vertexes 3, and vertexes of each reflector unit are supporting points 4. Specifically, each reflector unit is of a triangular pyramid structure with an open bottom surface and three side surfaces, and a metal wire mesh is arranged on each side surface; the bottom surface is a caliber surface, three end points of the caliber surface are boundary vertexes 3, and vertexes of the reflector unit are supporting points 4. Each corner reflector unit takes a surface formed by three edges with the same length as an aperture surface, and other surfaces except the aperture surface are uniformly pasted by a wire mesh to be used as light reflecting surfaces. The adjacent boundary vertexes 3 are hinged through two upper chords 1 through folding joints 5, namely, every two upper chords 1 are hinged through the folding joints 5, and a foldable structure is formed. The adjacent boundary vertexes 3 and the support points 4 are connected through support rods 2. The upper chord 1 and the supporting rod 2 are supporting frameworks of the reflector array, can be used as a framework to which a metal wire mesh is attached, and are hinged with the upper chord 1 by adding the folding joint 5, so that the reflector can be unfolded and folded.

The connection form of n reflector units is as follows: splicing six reflector units to form a regular hexagon splicing radial surface with the same opening orientation of the radial surface; or, with the regular hexagon splicing diametral plane as the center, the rest of the reflector units are sequentially and alternately connected to each boundary vertex 3 on the periphery of the central regular hexagon in a positive and negative way until the splicing diametral plane forms a regular polygon. Wherein, no matter the number n of the reflector units, the surface where each caliber surface forming the regular polygon obtained by splicing each layer is positioned is called a splicing caliber surface. For the splicing radial surface, the number n of the reflector units is at least six, and the reflector units can be spliced to form a regular hexagon; if n > 6, the remaining number of reflector elements is such that a regular polygonal mosaic diametric plane is formed exactly around the centrally located aperture plane, centred on the aperture plane of the regular hexagon. The number m of windings may be one or more turns.

To illustrate the principle of arranging the corner reflector unit arrays, the aperture plane of the upper array shown in fig. 5 is taken as an example, and the arrangement is as follows: arranged with the regular hexagon as the center and increasing in turns, as shown by the dashed lines in fig. 5, which is the second turn of the added corner reflector element, and so on, each time the outermost turn of the corner reflector element is added. When the whole corner reflector array has m turns, the number of corner reflector units is 6m²Because the novel corner reflector array provided by the utility model is of a mirror symmetry structure with upper and lower layers, the unit number of the whole corner reflector array is 12m under a plurality of corner reflector unit arrays². At this time, the position through which the thin wire rope operated by the driving motor passes is the boundary vertex 3 of the outermost circle of the aperture surface.

The two layers of reflector components are correspondingly hinged through n supporting points 4 of each layer to form a movable structure. Each layer of reflector assembly is provided with an unfolding-folding mechanism which is used for unfolding or folding the whole foldable RCS adjustable reflector about an unfolding-folding axis, wherein the unfolding-folding axis is a connecting line passing through the centers of the two spliced caliber surfaces, and the RCS can be adjusted and controlled by different unfolding degrees of the spliced caliber surfaces. The folded state is shown in fig. 10, and the unfolded state is a state in which the splice aperture surface is a plane to the maximum extent.

In some embodiments, as shown in fig. 8, the unfolding-folding mechanism includes a plurality of roller joints 10, a thin metal rope 6, and a stepping motor. The plurality of roller joints 10 are located at each boundary vertex 3 of the outermost ring of the splicing caliber surface and comprise roller structures and movable sleeve structures. As shown in fig. 9, the roller structure includes a U-shaped roller support 7, a pin shaft 9 and a roller 8 are arranged in parallel at an interval at an opening of the roller support 7, and a threading gap is left between the pin shaft 9 and the roller 8. And the movable sleeve structure is provided with a plurality of sleeves which are respectively hinged with the upper chord 1 and the support rod 2. One end of the thin metal rope 6 is fixed to any one of the roller supports 7, and the other end of the thin metal rope passes through the threading gaps of the roller supports 7 in sequence and is finally led out from the threading gaps in the roller supports 7 to which the thin metal rope 6 is fixed. And the stepping motor is connected with the leading-out end of the thin metal rope 6 and is used for dragging the thin metal rope 6 through the external force of the stepping motor so as to enable the splicing caliber surface to be contracted.

Thin metal ropes 6 penetrate between the roller 8 and the pin shaft 9 of the roller joint 10, penetrate through the thin metal ropes 6 from any boundary vertex 3 of the outer periphery of the splicing caliber surface, sequentially penetrate between the roller 8 and the pin shaft 9 of each roller joint 10 along the outer periphery of the splicing caliber surface, and after the thin metal ropes 6 surround a circle, the other ends of the thin metal ropes 6 are fixed on the boundary vertex 3 at the beginning. The thin metal ropes 6 on the lower reflector component which is in mirror symmetry with the reflector component are also arranged according to the same method, the starting point boundary vertex 3 for fixing the thin metal ropes 6 on the two reflector components is also in mirror symmetry, and the folded state is realized by simultaneously stretching the two thin metal ropes 6. The thin metal rope 6 is connected with a driving motor, and the thin metal rope 6 is stretched by the driving motor; the sleeve of the movable sleeve structure is hinged to the boundary vertex 3, one end of the sleeve is connected with the upper chord 1 or the support rod 2, and the other end of the sleeve is hinged to the boundary vertex 3, so that the upper chord 1 or the support rod 2 connected with the sleeve can move along with the folding of the reflector, and the folding and unfolding operation is realized.

In some embodiments, the boundary vertex 3 and the supporting point 4 are connected by the supporting rod 2, and the ratio of the sizes of the upper chord 1 and the supporting rod 2 is 1: 1.447, under the state of full expansion, the included angle between the adjacent top chord 1 and the support bar 2 is 45 degrees, every two included angles between the support bars are 90 degrees. The provided foldable RCS adjustable reflector is not limited by the size, can be enlarged or reduced in the same ratio, and can be enlarged or reduced in the ratio of: the upper chord and the support rod have the size ratio of 1: 1.447, after the equal magnification or reduction, the utility model still has the characteristics of good RCS regulation effect and light weight realized by unfolding and folding.

In some embodiments, the joints between the adjacent

upper chords

1 and 1, the joints between the adjacent

upper chords

1 and 2, and the joints between the adjacent support bars 2 and 2 are hinged through joint structures made of aluminum magnesium alloy. Each joint structure comprises a main body and a sleeve arranged on the main body, the sleeves and the main body are hinged, namely the sleeves can move within 0-90 degrees, the sleeves are used for being connected with the upper chords 1 and/or the supporting rods 2 and realizing hinging through the rotation of the sleeves, and the movable hinged structure ensures the smooth unfolding and folding of the integral structure of the reflector.

In some embodiments, as shown in fig. 2, when n is 6, the boundary vertices 3 of six reflector units are connected to each other by the upper chord 1 via the folding joints 5, and the six aperture surfaces are located in the same plane and are spliced into a regular hexagon with the same opening direction. Since the aperture surfaces formed by combination are regular hexagons, the electromagnetic wave receiving capability formed in the direction of each 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 for use, and on the basis of the embodiment of the array composed of 12 units of the present invention, the same corner reflector unit can be added in the manner of fig. 5, and the structure is still a two-layer mirror image structure, which can also realize the lightening of the reflector and the RCS regulation effect through the unfolding-folding of the reflector, and the technology is still applicable to one or more of the units.

In some embodiments, the upper chord 1 and the support rod 2 are carbon fiber hollow rods, so that the weight of the corner reflector array is effectively reduced under the condition of ensuring high structural strength, the reflector array is lightened, and loading, transportation and use are facilitated.

In some embodiments, the wire mesh is a gold-plated molybdenum wire, a gold-plated iron wire, or a stainless steel wire, the wire mesh having a wire diameter of 0.02mm to 0.5mm and a mesh diameter of 3mm to 10 mm. The weight of the wire mesh is much less than that of a conventional metal reflective surface. The utility model works on electromagnetic waves with the frequency of 2-20GHz, and the experimental test proves that the metal wire mesh has the reflection effect.

The utility model relates to a method for regulating an expandable-furlable RCS adjustable reflector, which comprises the following steps:

a folding process: after the thin metal rope 6 passing through the roller joint 10 is tensioned by stretching the thin metal rope 6 by the driving motor, each reflector unit is folded by taking an unfolding-folding axis as a center, a metal wire mesh is folded along with the folding axis, and the aperture surface of the reflector is reduced;

and (3) unfolding: the driving motor does not apply external force to the thin metal rope 6, each reflector unit is unfolded under the reaction of the folding joint 5, the metal wire mesh is unfolded to form a reflecting surface, and the aperture surface of the reflector is enlarged.

The stretching degree of the thin metal rope is controlled through the driving motor, the unfolding and folding degree of the splicing radial surface is controlled, the splicing radial surface which is unfolded and folded in different degrees is provided, different RCSs are correspondingly obtained, and the RCS can be regulated and controlled according to the corresponding relation between the splicing radial surface and the RCS.

And the integral foldable RCS adjustable reflector is unfolded or folded about an unfolding-folding axis, wherein the unfolding-folding axis is a connecting line passing through the centers of the two spliced caliber surfaces. Different unfolding degrees determine different electromagnetic scattering characteristics of the RCS, namely the RCS can be regulated and controlled by means of different unfolding and folding states. The integral furling of the RCS adjustable reflector capable of being unfolded and furled is realized by driving a thin metal rope 6 to stretch by a stepping motor, the unfolding is realized by the action of a spring in a folding joint 5, the stepping motor is usually connected with the thin metal rope 6, and the thin metal rope 6 sequentially passes through all boundary vertexes 3 of the outermost ring (all the boundary vertexes 3 are the boundary vertexes 3 of all caliber surfaces of an upper layer and a lower layer). During regulation and control, the two splicing radial surfaces are taken as main scattering surfaces, and in the folding process, the stepping motor works to drive the thin metal rope 6 to stretch, so that the plurality of reflector units are folded under each joint hinge mechanism; in the unfolding process, the stepping motor stops working, the thin metal rope 6 is naturally loosened, and the plurality of reflector units are unfolded under the action of the spring in the folding joint 5. The plurality of reflector units realize the regulation and control of the RCS through the unfolding-folding process, and the specific target regulation and control effect is determined according to the use purpose and the electromagnetic environment.

Examples

The RCS adjustable reflector capable of being unfolded and folded comprises 12 corner reflector units, wherein the length sizes of an upper chord 1 and a support rod 2 of each unit are 213.38mm and 308.84mm respectively, the outer diameters of the upper chord 1 and the support rod are 5mm, and a sleeve for hinging in a joint structure is 7mm in outer diameter and 5mm in inner diameter. The reflector supporting framework is composed of an upper chord 1 and supporting rods 2 made of carbon fiber hollow rods and each joint hinge structure, and the reflecting surface is fixed on each supporting rod 2 through a metal wire mesh by a special adhesive.

Because the upper chord member 1 and the support rod 2 are both carbon fiber hollow rods, and each hinged joint structure is made of aluminum-magnesium alloy, the reflecting surface of the metal wire mesh ensures the characteristics of light weight and high structural strength of the integral device. Since the reflecting surface of a typical corner reflector array is made of metal, the weight of the corner reflector array is more than several kilograms or even dozens of kilograms, and the size of the corner reflector array is more than several meters or even larger. The basic parameters in the examples of the present invention are shown in table 1, and the total weight after laying the wire mesh is only 1.325Kg, and the furled volume is only 0.004m³An expandable-collapsible RCS adjustable reflector is described, which has a small volume after being completely collapsed, and the expanded volume is 0.325m³The accommodation rate reaches 81.25%, and it can be seen from table 1 that the foldable RCS adjustable reflector of the present invention has the advantages of light weight, small foldable volume, large foldable volume and high accommodation rate.

Table 1 basic parameters of the reflectors of the examples

Through the experimental test to this embodiment, can learn according to the experimental result, this reflector can realize the different scattering characteristic to the electromagnetic wave through different expansion and furl degree (different states), has realized the regulation and control to RCS promptly.

Based on the above embodiment, the experimental analysis is performed on four states of the foldable RCS adjustable reflector of the present invention, and the relationship between the RCS (radar scattering cross-sectional area) and the incident wave frequency in the four foldable RCS states is obtained, as shown in the RCS curves in fig. 6 and 7. When the RCS regulation and control effect required to be realized is determined, the expansion degree of the aperture surface of the reflector can be adjusted according to the required RCS by referring to the change curve of the RCS in different states along with the frequency. When the reflector is used for interfering the detection of the radar, the principle is that the reflector is frequently and irregularly unfolded and folded, namely the RCS of the reflector is continuously changed, so that the radar detects the RCS which is irregularly changed, and the detection of the radar is interfered.

Wherein, based on the angle formed by two upper chords 1 hinged by the folding joint 5 on the aperture surface of each reflector unit, and the angle is theta, the four unfolding and folding states of the RCS adjustable reflector which can be unfolded and folded are respectively: when θ is 180 °, state 1 is obtained; when θ is 135 °, state 2 is obtained; when θ is 90 °, state 3 is obtained; when θ is 45 °, state 4 is obtained. Given the experimental results of the embodiment of the foldable RCS adjustable reflector, the frequency range is 2-20GHz, and experimental tests show that the RCS variation curves along with the frequency under four unfolding and folding degrees (states 1, 2, 3 and 4) are respectively obtained, so that the curves are clearly shown, and the

states

1 and 2, and the

states

3 and 4 are respectively put together for comparison. Fig. 6 is a curve of the RCS of the reflector in the

states

1 and 2 along with the change of frequency, and it can be seen that the reflector has corresponding RCS values at different frequencies, most of the RCS values are greater than 10dB, and the reflector has an obvious reflection effect, and in both states, most of the frequency points of the RCS of the reflector are greater than 10dB, which indicates that the reflector has the most basic working capability, i.e., can reflect out electromagnetic waves. Comparing the curves of the reflectors RCS in the two states, the difference value of the RCS in the two states is as high as 25dB and close to 30dB at some frequency points, which shows that the adjustable reflector capable of being unfolded and folded can adjust the RCS through switching the states, namely, the stepping motor drives the thin metal rope to enable the reflector to present different unfolding degrees and show the effect of regulating and controlling the RCS. Fig. 7 is a curve of the change of the RCS of the reflector with frequency in the

states

3 and 4, and it can be seen that the difference of the RCS in some frequency bands is more obvious in the two states, i.e. the regulation is effective. Through comparison of the RCS curves in the four states, the fact that the adjustable reflector of the RCS can be unfolded and folded is verified, and the feasibility of regulation and control of the RCS is achieved by adjusting the unfolding degree of the splicing radial surface of the reflector.

According to the experimental data of the above embodiment, it can be seen that the control effect of the foldable RCS adjustable reflector is as follows: when the unfolded-folded RCS adjustable reflector is required to present a large RCS, the whole is adjusted to a corresponding state in the mode, and the required scattering characteristic is obtained; when the foldable RCS adjustable reflector is required to present a small RCS, the whole body is adjusted to a corresponding state in the mode. In addition, when an expandable-collapsible RCS adjustable reflector is used as a passive disturbance for radar detection, the radar detection is disturbed by implementing irregular switching of the expandable-collapsible RCS adjustable reflector in different states, and experimental data of the embodiment shows that the irregular switching in different states has a function of implementing the irregular change of the RCS.

The utility model provides a light high-structural-strength carbon fiber hollow rod used as a support framework of a reflector array, wherein a magnesium-aluminum alloy is adopted in each joint hinge structure to ensure enough strength, a woven wire mesh is used as a reflecting surface, and the elasticity of the woven wire mesh ensures the electromagnetic wave reflecting effect of an RCS adjustable reflector which can be unfolded and folded in the unfolding and folding processes. These structures also represent a significant advantage in weight, much less than existing reflector products. In the embodiment, the diameter of the mesh of the wire mesh is 5mm, the experimental test frequency band is 2-20GHz, and the foldable RCS adjustable reflector has the reflector effect in the frequency band.

The triangular three-sided corner reflector unit is used as a base, the corner reflector unit has the function of enhancing reflection, and in order to enable the aperture surface of the corner reflector array to receive incoming waves to the maximum extent, namely, to enable the aperture surface of the corner reflector array to be distributed uniformly as much as possible, therefore, the utility model designs that the splicing aperture surfaces of the corner reflector unit are arranged according to a regular polygon, and the splicing aperture surfaces formed in the aperture surface have equivalent electromagnetic wave receiving capacity in all directions. After design, experimental tests show that the foldable RCS adjustable reflector can select the unfolding degree, namely different states, according to different required electromagnetic scattering characteristics, so that the RCS can be regulated and controlled in the corresponding states; interference with radar detection may also be achieved by adjusting the degree of deployment of an extendable-collapsible RCS adjustable reflector, such as an extendable-collapsible RCS adjustable reflector that varies irregularly.

The foldable RCS adjustable reflector adopts an unfolding and folding strategy of the aperture surface, and adjusts the unfolding degree of the splicing aperture surface according to the required scattering characteristic in a complex electromagnetic environment by aligning the splicing aperture surface with incoming waves, thereby achieving the purpose of regulating and controlling the RCS.

The utility model discloses an expandable-furlable RCS adjustable reflector, which is characterized in that a light material with high structural strength is selected according to the characteristics of structure, material and the like besides the RCS adjustable operation is realized, an upper chord 1 and a support rod 2 both adopt carbon fiber hollow rods, a joint hinge structure adopts a magnesium-aluminum alloy material, a reflecting surface adopts a metal wire mesh woven by stainless steel wires, and the characteristics of softness, high elasticity and high tensile rate of the metal wire mesh can still ensure good reflecting effect in the expanding and furling operation in addition to the advantage of light weight. Meanwhile, the foldable RCS adjustable reflector has the foldable characteristic and can show great volume advantages in the aspects of transportation and carrying.

Claims

1. An RCS adjustable reflector capable of being unfolded and folded, which is characterized by comprising a layer of reflector assembly and another layer of reflector assembly arranged in a mirror image mode, wherein each reflector assembly comprises n reflector units which are connected with each other, and n is a positive integer greater than or equal to 6;

each reflector unit is a triangular three-sided corner reflector, each reflector unit is provided with an aperture surface with an open top and a side surface provided with a metal wire mesh, three end points of each aperture surface are boundary vertexes (3), the vertexes of each reflector unit are supporting points (4), adjacent boundary vertexes (3) are hinged through two upper chords (1), the adjacent boundary vertexes (3) are connected with the supporting points (4) through supporting rods (2), and the two upper chords (1) are connected through folding joints (5) to form a foldable structure;

the connection form of n reflector units is as follows: splicing six reflector units to form a regular hexagon splicing radial surface with the same opening orientation of the radial surface; or, with the regular hexagon splicing diametral plane as the center, the rest reflector units are sequentially and alternately connected to the boundary vertexes (3) on the periphery of the central regular hexagon in a positive and negative mode until the splicing diametral plane forms a regular polygon;

the two layers of reflector components are correspondingly hinged through n supporting points (4) of each layer to form a movable structure;

each layer of reflector assembly is provided with an unfolding-folding mechanism which is used for unfolding or folding the whole foldable RCS adjustable reflector about an unfolding-folding axis, wherein the unfolding-folding axis is a connecting line passing through the centers of the two spliced caliber surfaces, and the RCS can be adjusted and controlled by different unfolding degrees of the spliced caliber surfaces.

2. The RCS tunable unfolded and folded reflector of claim 1, wherein the unfolding and folding mechanism on each layer of reflector assembly comprises:

a plurality of roller joints (10) which are positioned at each boundary vertex (3) of the outermost ring of the splicing caliber surface and comprise a roller structure and a movable sleeve structure; the roller structure comprises a U-shaped roller support (7), a pin shaft (9) and a roller (8) are arranged at an opening of the roller support (7) in parallel at intervals, and a threading gap is reserved between the pin shaft (9) and the roller (8); the movable sleeve structure is provided with a plurality of sleeves which are respectively hinged with the upper chord (1) and the supporting rod (2);

one end of the thin metal rope (6) is fixed to any one of the roller supports (7), and the other end of the thin metal rope passes through the threading gaps of the roller supports (7) in sequence and is finally led out from the threading gaps in the roller supports (7) fixed by the thin metal rope (6);

and the stepping motor is connected with the leading-out end of the thin metal rope (6) and is used for dragging the thin metal rope (6) through the external force of the stepping motor so as to enable the splicing caliber surface to shrink.

3. An expandable-collapsible RCS adjustable reflector according to claim 1 or 2, characterized in that the ratio of the dimensions of the upper chord (1) and the support rods (2) is 1: 1.477, in the complete expansion state, the included angle between the adjacent upper chord (1) and the support rod (2) is 45 degrees, and the included angle between every two support rods (2) is 90 degrees.

4. The foldable RCS adjustable reflector according to claim 3, wherein the adjacent joint of the upper chord (1) and the upper chord (1), the adjacent joint of the upper chord (1) and the supporting rod (2), and the adjacent joint of the supporting rod (2) and the supporting rod (2) are hinged by a joint structure made of Al-Mg alloy.

5. A deployable and collapsible RCS tunable reflector according to claim 3, wherein when n is 6, the boundary vertices (3) of six reflector elements are connected to each other, and the six aperture surfaces are spliced to form a regular hexagon with the same opening direction.

6. An unfoldable RCS adjustable reflector according to claim 3, characterised in that the upper chord (1) and the support rods (2) are carbon fibre hollow rods.

7. The foldable RCS tunable reflector according to claim 3, wherein the wire mesh is a gold-plated molybdenum wire, a gold-plated iron wire or a stainless steel wire, the wire mesh has a wire diameter of 0.02mm to 0.5mm, and a mesh diameter of 3mm to 10 mm.