A low-scattering carrier for RCS testing

Abstract

The present invention relates to a low-scattering carrier for RCS testing. The low-scattering carrier is a hollow cavity with outward protrusions on all sides. The hollow cavity is used to accommodate a cylindrical target component to shield the outer wall surface of the cylindrical target component. The cylindrical target component is a hollow structure. One end of the hollow cavity is an open end, and the other end is a pointed end protruding outward. The open end is circular. The cylindrical target component is installed in the hollow cavity through the open end. Part of the bottom area of the low-scattering carrier is a plane. The plane is provided with an opening. The opening is used to pass through a support component that supports the cylindrical target component. The low-scattering carrier of the present invention can not only eliminate the edge scattering of the cylindrical target component, but also effectively shield the electromagnetic wave scattering generated by its outer wall surface and other structures, better simulate the installed state of the cylindrical target component, and achieve accurate evaluation of the RCS of the cylindrical target component.

Description

Technical Field

[0001] The present invention relates to the technical field of target far-field electromagnetic scattering characteristics testing, and in particular to a low-scattering carrier for RCS testing. Background Art

[0002] With the development of radar detection technology, in order to improve the survivability of aircraft, it has become necessary to optimize the radar stealth design of aircraft layout. Therefore, the stealth research of aircraft components is a prerequisite and inevitable measure for the evaluation of the stealth characteristics of the aircraft as a whole.

[0003] However, once the barrel-shaped target component is separated from the aircraft's main structure, the edge and embedded structure of the barrel-shaped target component will be exposed to radar waves. If the barrel-shaped target component is tested without any treatment, the scattering of its edge and embedded structure will affect the test accuracy of the barrel-shaped target component.

[0004] In the related art, there is no low-scattering carrier suitable for RCS testing of cylindrical target aircraft components. Therefore, it is urgent to provide a low-scattering carrier for RCS testing of cylindrical target structures. Summary of the Invention

[0005] An embodiment of the present invention provides a low-scattering carrier for RCS testing, which can simulate the installed state of a barrel-shaped target component and achieve accurate evaluation of the RCS of the barrel-shaped target component.

[0006] An embodiment of the present invention provides a low-scattering carrier for RCS testing. The low-scattering carrier is a hollow cavity with outwardly protruding peripheries. The hollow cavity is used to accommodate a cylindrical target component to shield the outer wall of the cylindrical target component. The cylindrical target component is a hollow structure. One end of the hollow cavity is an open end, and the other end is a pointed end protruding outward. The open end is circular. The cylindrical target component is installed in the hollow cavity through the open end.

[0007] A partial area of the bottom of the low-scattering carrier is a plane, and an opening is provided on the plane. The opening is used to penetrate a supporting component that supports the cylindrical target component.

[0008] In one possible design, the horizontal projection of the low-scattering carrier includes a first arc and a second arc, the bending directions of the first arc and the second arc are opposite, and the tangent of the rear end point of the first arc intersects with the tangent of the rear end point of the second arc to form a rear end angle.

[0009] In a possible design, the rear end angle is 60° to 80°.

[0010] In a possible design, the bottom of the low-scattering carrier includes a smooth curved surface and a flat surface, and the smooth curved surface and the flat surface are continuously transitioned through a curvature.

[0011] In a possible design, the roughness of the surface of the low-scattering carrier is less than 1.6.

[0012] In a possible design, the open end is provided with a connecting flange, and the cylindrical target component is installed in the hollow cavity through the connecting flange.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects:

[0014] The present invention configures a low-scattering carrier as a hollow cavity with outward protrusions on all sides. The hollow cavity can accommodate a barrel-shaped target component for RCS testing. This not only eliminates edge scattering of the barrel-shaped target component, but also effectively blocks additional electromagnetic wave scattering caused by the outer wall and other structures of the barrel-shaped target component. It better simulates the installed state of the barrel-shaped target component and has a low RCS value within the main detection angle range, without adversely affecting the RCS test of the barrel-shaped target component, thereby enabling accurate RCS testing of the barrel-shaped target component. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are 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.

[0016] Figure 1 1 is a schematic front view of a low-scattering carrier for RCS testing provided by one embodiment of the present invention;

[0017] Figure 2 1 is a schematic diagram of an oblique structural view of a low-scattering carrier for RCS testing provided by one embodiment of the present invention;

[0018] Figure 3 1 is a schematic diagram of the structure of a low-scattering carrier for RCS testing provided by one embodiment of the present invention;

[0019] Figure 4 This is a horizontal projection diagram of a low-scattering carrier for RCS testing provided by one embodiment of the present invention.

[0020] Figure numerals: 1-hollow cavity; 11-opening end; 12-tip; 13-plane; 131-opening; 111-first arc line; 112-second arc line; 113-rear end angle. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] After the overall stealth design of an aircraft is completed, due to limitations in development funding and experimental platforms, most aircraft components need to be disassembled for evaluation. When the components are separated from the aircraft, previously unseen edges, surfaces, and other structures will be exposed to radar waves. If no treatment measures are taken, these exposed structures will have a serious impact on the test and evaluation of the target component as an interference source. Considering that there is currently no low-scattering carrier suitable for cylindrical target components, in order to more accurately evaluate the RCS indicators of cylindrical target components, such as Figure 1 and Figure 2 As shown, the present invention provides a low-scattering carrier for RCS testing. The low-scattering carrier is a hollow cavity 1 with outward protrusions on all sides. The hollow cavity 1 is used to accommodate a cylindrical target component to shield the outer wall surface of the cylindrical target component. The cylindrical target component is a hollow structure. One end of the hollow cavity 1 is an open end 11, and the other end is a pointed end 12 protruding outward. The open end 11 is circular. The cylindrical target component is installed in the hollow cavity 1 through the open end 11.

[0023] like Figure 3 As shown, a partial area of the bottom of the low-scattering carrier is a plane 13, and an opening 131 is provided on the plane 13. The opening 131 is used to penetrate a supporting component that supports the cylindrical target component.

[0024] In the present invention, the low-scattering carrier is designed as a hollow cavity structure with outward protrusions on all sides. The hollow cavity structure can accommodate a cylindrical target component for RCS testing. The open end of the hollow cavity is conformal to one end of the cylindrical structure, so that the two can be tightly connected. After the cylindrical target component is placed in the low-scattering carrier, not only can the edge scattering of the cylindrical target structure be eliminated, but also the outer surface structure thereof that is prone to generating interference sources can be effectively shielded. Moreover, the surface curvature of the low-scattering carrier that protrudes outwards on all sides is relatively continuous and has no structures such as concave cavities, so that the low-scattering carrier has a better surface current guiding effect. When performing RCS testing of the target component, the low-scattering carrier has lower scattering characteristics than the cylindrical target component. Therefore, the low-scattering carrier has less influence on the RCS test of the cylindrical target component, thereby being able to better simulate the installed state of the cylindrical target component and realize accurate test and evaluation of the RCS of the cylindrical target component.

[0025] The present invention provides a plane adapted to the experimental platform at the bottom of the low-scattering carrier. The plane can stably place the low-scattering carrier both on the laboratory bench and in the warehouse. An opening is provided on the plane in the present invention. The opening is used to pass through the supporting component that supports the barrel-shaped target structure, thereby ensuring the stability and operability of the barrel-shaped target component during measurement and evaluation. In actual operation, the size of the opening can be specifically determined according to the size of the supporting structure.

[0026] In some embodiments, one end of the barrel-shaped target component is flush with the port of the open end 11; in the present invention, the open end of the hollow cavity is provided with a connecting flange that matches the target structure. When testing the RCS of the barrel-shaped target component, the barrel-shaped target component can be placed in the hollow cavity, and one end of the barrel-shaped target component is kept flush with the open end of the hollow cavity, and the other end is fixed by a supporting structure to ensure the stability of the barrel-shaped target component. In this way, the edge of the barrel-shaped target can be tightly connected to the low-scattering carrier without a step difference, and aluminum foil is pasted in the gap between the two, thereby ensuring that there will be no discontinuous echo reflection and strong mirror reflection and other interference sources at the connection between the two, thereby ensuring the accuracy of the RCS test of the barrel-shaped target component.

[0027] like Figure 4 As shown, in some embodiments, the horizontal projection of the low-scattering carrier includes a first arc 111 and a second arc 112, the bending directions of the first arc 111 and the second arc 112 are opposite, and the tangent of the rear end point of the first arc 111 intersects with the tangent of the rear end point of the second arc 112 to form a rear end angle 113.

[0028] In some embodiments, the rear end angle 113 is between 60° and 80°.

[0029] In the present invention, the angle formed after the low-scattering carrier is horizontally projected is the rear end angle of the low-scattering carrier. By setting the angle of the rear end of the low-scattering carrier to 60° to 80°, when the electromagnetic wave is incident on the surface of the low-scattering carrier within a larger angular range, the horizontal polarization and vertical polarization scattering generated by the rear end of the carrier are smaller.

[0030] In some embodiments, the bottom of the low-scattering carrier includes a smooth curved surface 14 and a flat surface 13 , and the smooth curved surface 14 and the flat surface 13 are continuously transitioned through curvature.

[0031] In the present invention, by setting the bottom of the low-scattering carrier to a smooth curved surface and a flat surface, and the smooth curved surface and the flat surface have a continuous transition of curvature, it can not only ensure that the low-scattering carrier can be stably placed on the experimental plane, but also ensure that the low-scattering carrier has a low RCS value. It should also be noted that the plane in the present invention is preferably set in the central area of the bottom of the low-scattering carrier. The size of the plane can be any size as long as it can play the role of stably placing the low-scattering carrier. The present invention has no special requirements on the size of the plane.

[0032] In some embodiments, the surface roughness of the low-scattering carrier is less than 1.6. A carrier roughness less than 1.6 is more conducive to reducing the scattering of electromagnetic waves generated when propagating on the carrier. In the present invention, the low-scattering carrier can be made of aluminum. Using aluminum to prepare the low-scattering carrier is conducive to reducing the scattering of electromagnetic waves generated when propagating from the target component to the surface of the low-scattering carrier. Electromagnetic waves propagating on aluminum materials produce less scattering, and it is also conducive to reducing the weight of the low-scattering carrier.

[0033] In some embodiments, a connecting flange is provided at the open end 11, and the cylindrical target component is installed in the hollow cavity 1 via the connecting flange. In the present invention, by providing a connecting flange that matches the cylindrical target component at the open end of the hollow cavity, after the cylindrical target component is installed in the hollow cavity, it is only necessary to treat the gap between the cylindrical target component and the hollow cavity by pasting aluminum foil. This ensures that the connection between the cylindrical target component and the hollow cavity will not have surface discontinuous echo reflections and strong specular reflection sources, thereby facilitating the accuracy of the RCS test of the cylindrical target component.

[0034] It should be noted that, in this article, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the presence of other identical factors in the process, method, article or device comprising the elements.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A low-scattering carrier for RCS testing, characterized in that: The low-scattering carrier is a hollow cavity with outward protrusions on all sides. The hollow cavity is used to accommodate a cylindrical target component to shield the outer wall surface of the cylindrical target component. The cylindrical target component is a hollow structure. One end of the hollow cavity is an open end, and the other end is a pointed end protruding outward. The open end is circular. The cylindrical target component is installed in the hollow cavity through the open end. One end of the cylindrical target component is flush with the port of the open end. Part of the bottom area of the low-scattering carrier is a plane, and an opening is provided on the plane. The opening is used to penetrate a supporting component that supports the cylindrical target component; the bottom of the low-scattering carrier includes a smooth curved surface and a flat surface, and the smooth curved surface and the flat surface are continuously transitioned through curvature.

2. The low-scattering carrier according to claim 1, characterized in that: The horizontal projection of the low-scattering carrier includes a first arc and a second arc, the first arc and the second arc have opposite bending directions, and the tangent of the rear end point of the first arc intersects with the tangent of the rear end point of the second arc to form a rear end angle.

3. The low-scattering carrier according to claim 2, characterized in that: The degree of the rear end angle is 60 to 80 degrees.

4. The low-scattering carrier according to claim 1, characterized in that The roughness of the surface of the low-scattering carrier is less than 1.

6.

5. The low-scattering carrier according to claim 1, characterized in that: The open end is provided with a connecting flange, and the cylindrical target component is installed in the hollow cavity through the connecting flange.

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