A low-scattering carrier for RCS testing

Abstract

The present invention relates to a low-scattering carrier for RCS testing, comprising a carrier body having a first surface and a second surface that protrude outward, the first surface and the second surface being seamlessly connected so that the carrier body forms a double teardrop-shaped spliced structure, a portion of the first surface being recessed inward to form a first groove; and a fixing seat installed in the first groove, a portion of the outer surface of the fixing seat being recessed inward to form a second groove, the second groove being used to install a target component for RCS testing. The present invention provides a fixing seat on the carrier body, allowing a flat-plate target component to be installed on the carrier body via the fixing seat, so that the carrier body effectively shields the edges and embedded structures of the flat-plate target component, and can better simulate the state of the flat-plate target component during actual installation, thereby achieving accurate evaluation of the RCS of the flat-plate 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] When the flat-plate target component is separated from the main structure of the aircraft, an interference source that did not exist before will be generated. The edges, surfaces, cavities and other structures that did not originally exist in the flat-plate target component will be exposed to radar waves. If no treatment measures are taken, the accuracy of the evaluation results of the flat-plate target component will be adversely affected.

[0004] In the related art, low-scattering carriers are not suitable for RCS testing of flat-plate aircraft components. Therefore, there is an urgent need to provide a low-scattering carrier for RCS testing of flat-plate 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 flat-plate target component and achieve accurate evaluation of the RCS of the flat-plate target component.

[0006] An embodiment of the present invention provides a low-scattering carrier for RCS testing, including:

[0007] The carrier body has a first surface and a second surface that are convex outwards, the first surface and the second surface are seamlessly connected to form a double teardrop-shaped splicing structure of the carrier body, and a portion of the first surface is inwardly concave to form a first groove;

[0008] A fixing seat is installed in the first groove, and a part of the outer surface of the fixing seat is recessed inward to form a second groove, and the second groove is used to install the target component for RCS testing.

[0009] In a possible design, the first surface includes a smooth curved surface and a flat surface, the smooth curved surface and the flat surface are continuously transitioned through a curvature, and a partial area of the flat surface is recessed inward to form the first groove.

[0010] In a possible design, the outer surface of the fixing seat is flush with the plane.

[0011] In one possible design, the horizontal projection of the carrier body includes a first arc and a second arc, the bending directions of the first arc and the second arc are opposite, and the tangents of the two endpoints of the first arc intersect with the tangents of the two endpoints of the second arc to form a first angle and a second angle.

[0012] In a possible design, the first angle is 50 to 90 degrees, and the second angle is 80 to 120 degrees.

[0013] In a possible design, the connection point of the first surface and the second surface is located in the same horizontal plane, and the angle between the first surface and the horizontal plane and the angle between the second surface and the horizontal plane are both 0° to 5°.

[0014] In a possible design, the roughness of the first surface and the second surface are both less than 1.6.

[0015] In a possible design, the carrier body has a length of 1.5 to 2.5 m, a width of 0.8 to 1.5 m, and a height of 0.3 to 0.5 m.

[0016] In a possible design, a connecting flange is provided in the first groove, and the fixing seat is installed in the first groove through the connecting flange.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] In the present invention, the outwardly protruding first and second surfaces of the carrier body give the carrier body a double teardrop-shaped spliced structure. This structure provides excellent surface current guidance, reducing strong scattering sources such as specular scattering and multiple scattering, while effectively preventing fluctuations in the carrier body within low scattering angles. By providing a mounting base on the carrier body, the present invention allows the flat-plate target component to be mounted on the carrier body via the mounting base. This allows the carrier body to effectively shield the edges and embedded structures of the flat-plate target component, effectively simulating the state of the flat-plate target component during actual installation, thereby accurately evaluating the RCS of the flat-plate target component. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 1 is a schematic structural diagram of a low-scattering carrier for RCS testing provided by one embodiment of the present invention;

[0021] Figure 2 1 is a schematic diagram of a top view of a low-scattering carrier for RCS testing provided by one embodiment of the present invention;

[0022] Figure 3 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;

[0023] Figure 4 1 is a schematic side view of a low-scattering carrier for RCS testing provided by one embodiment of the present invention;

[0024] Figure 5 1 is a horizontal projection diagram of a low-scattering carrier for RCS testing provided by one embodiment of the present invention;

[0025] Figure 6 This is a vertical projection diagram of a low-scattering carrier for RCS testing provided by one embodiment of the present invention.

[0026] Reference numerals:

[0027] 1-carrier body; 11-first surface; 12-second surface; 111-smooth curved surface; 112-flat surface; 13-first groove; 113-first arc line; 114-second arc line; 115-first angle; 116-second angle; 2-fixing seat; 21-second groove. DETAILED DESCRIPTION

[0028] 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.

[0029] Generally, after the overall stealth design of an aircraft is completed, it is necessary to conduct RCS evaluation on each component of the aircraft separately. When the major components are separated from the aircraft as a whole, their edges, surfaces, cavities and other structures that were not originally there will be exposed to radar waves. These exposed structures will act as interference sources and have a serious impact on the RCS test evaluation of the target components. Therefore, the embodiment of the present invention provides a low-scattering carrier for RCS testing, such as Figures 1 to 4 Shown, including:

[0030] The carrier body 1 has an outwardly convex first surface 11 and a second surface 12, the first surface 11 and the second surface 12 are seamlessly connected to form a double teardrop-shaped splicing structure of the carrier body 1, and a portion of the first surface 11 is inwardly concave to form a first groove 13;

[0031] The fixing base 2 is installed in the first groove 13 , and a portion of the outer surface of the fixing base 2 is recessed inward to form a second groove 21 . The second groove 21 is used to install a target component for RCS testing.

[0032] In the present invention, the carrier body is designed with an outwardly convex first and second surfaces, which are seamlessly connected, resulting in a double teardrop-shaped structure. This structure ensures a relatively continuous surface curvature of the carrier body, free of cavities and other structures, and eliminates strong scattering sources such as surface specular reflection and multiple radiation. Furthermore, the carrier body has excellent surface current guidance, reducing the contribution of traveling wave scattering, resulting in a low forward scattering RCS over a wide angle range. A mounting bracket is provided on the carrier body, through which a flat-plate target component can be mounted. The carrier body effectively shields the exposed structure and edges of the flat-plate target component after it is separated from the aircraft. During RCS testing of the target component, the low-scattering carrier has lower scattering characteristics than the flat-plate target component, resulting in a lesser impact on the RCS test of the flat-plate target component, effectively simulating the installed state of the flat-plate target component and enabling accurate RCS testing and evaluation of the flat-plate target component.

[0033] The low-scattering carrier in the present invention not only has a low RCS performance itself, but also can effectively shield the edges and embedded structures of the flat-plate target components, thereby realizing the stealth measurement and evaluation of the flat-plate target components in a simulated installed state; the present invention integrates the low-scattering carrier and the flat-plate target component into an integrated structure design, and the two are smoothly and tightly connected, which not only eliminates the edge scattering of the flat-plate target component, but also shields the inner cavity structure of the flat-plate target component, better simulates the state of the flat-plate target component when it is actually installed, thereby realizing accurate measurement and evaluation of the RCS of the flat-plate target component.

[0034] like Figure 3 As shown, in some embodiments, the first surface 11 includes a smooth curved surface 111 and a flat surface 112 . The smooth curved surface 111 and the flat surface 112 are continuously transitioned through curvature, and a portion of the flat surface is recessed inward to form a second groove 13 .

[0035] In the present invention, the first surface includes a smooth curved surface and a flat surface, and the smooth curved surface and the flat surface have a continuous transition through curvature. The first surface is relatively smooth and has no structures such as cavities. This not only eliminates strong scattering interference sources such as mirror reflection and multiple reflections from the carrier body, but also enables the carrier body to have a better surface current guidance function. Part of the plane of the first surface is recessed inward to form a first groove, and the fixing seat can be installed in the first groove to connect with the carrier body. The plane position of the present invention is preferably located in the central area of the first surface, for example, it can be Figures 1 to 3 As shown in , this is more conducive to ensuring the accuracy of RCS measurement of flat target components.

[0036] In some embodiments, as Figure 1 and 2 As shown in FIG, the outer surface of the fixing seat 2 is flush with the plane 112 .

[0037] In the present invention, as shown in the figure, after the fixing seat is installed in the first groove, the outer surface of the fixing seat is flush with the plane without step difference, which is not only conducive to ensuring that the carrier body has a good surface current guiding effect, but also conducive to the installation and measurement of flat target components of various sizes; in the present invention, the interior of the low-scattering carrier is a hollow structure, so that the low-scattering carrier in the present invention can be suitable for target components with at least one side having a flat structure, and the internal design is specially designed to match and support the flat target component. At the same time, a connecting and fixing flange structure is designed in the first groove connecting the carrier body and the fixing seat; when testing the flat target component, the fixing seat is first removed, and the flat target component is tested according to the size of the flat target component. A second groove matching the target component is cut out on the surface of the fixing seat, and then the flat target component is placed inside the hollow carrier body. The side of the target component with a flat structure is fixed on the second groove, and the surface of the target component is made flush with the outer surface of the fixing seat. Finally, the fixing seat is installed in the first groove. This blocks the structure of the flat target component that was originally exposed when it was not separated from the overall aircraft structure. Aluminum foil is used to process the tiny gaps between the fixing seat and the carrier body, and between the flat target component and the fixing seat, so that there will be no discontinuous echo reflection and strong mirror reflection on the surface of the carrier, thereby ensuring the accuracy of the RCS evaluation of the flat target component.

[0038] As shown in the figure, in some embodiments, the horizontal projection of the carrier body 1 includes a first arc 113 and a second arc 114, the bending directions of the first arc 113 and the second arc 114 are opposite, and the tangents of the two endpoints of the first arc 113 intersect with the tangents of the two endpoints of the second arc 114 to form a first angle 115 and a second angle 116.

[0039] In some embodiments, the first angle 115 is between 50° and 90°, and the second angle 116 is between 80° and 130°.

[0040] In the present invention, the degree of the first angle of the low-scattering carrier is smaller than the degree of the second angle. In actual application, the first angle corresponds to the front of the low-scattering carrier, and the second angle corresponds to the rear of the low-scattering carrier. According to electromagnetic scattering theory, the forward angle and backward angle of the low-scattering carrier determine the low-scattering angle range of the low-scattering carrier. When the forward angle is within 50° to 90°, the present invention can ensure that the horizontal polarization scattering and vertical polarization scattering generated when the electromagnetic wave is incident on the surface of the low-scattering carrier within a larger angular range are small; therefore, in actual testing, when testing the forward RCS of a flat-plate target, the direction of the front of the flat-plate target component can be controlled to be consistent with the direction of the first angle of the low-scattering carrier, and the direction of the rear can be consistent with the direction of the second angle of the low-scattering carrier; when testing the backward RCS of the flat-plate target component, the direction of the rear of the flat-plate target component can be controlled to be consistent with the direction of the first angle of the low-scattering carrier, and the direction of the front can be consistent with the direction of the second angle of the low-scattering carrier.

[0041] In some embodiments, as Figure 6 As shown, the connection between the first surface 11 and the second surface 12 is located in the same horizontal plane, and the angle between the first surface 11 and the horizontal plane and the angle between the second surface 12 and the horizontal plane are both 0-5 degrees.

[0042] In the present invention, by setting the angle between the first surface and the horizontal plane to 0° to 5°, the surfaces of the fixing seat in the first surface of the carrier body are easier to connect, and the curvature between the smooth curved surface and the flat surface in the first surface is more continuous. At the same time, after the flat target component is installed in the second groove in the fixing seat, it is beneficial to ensure that the curvature of the first surface of the low-scattering carrier is relatively continuous, thereby ensuring the accuracy of the test and evaluation of the flat target component.

[0043] In some embodiments, the roughness of the first surface 11 and the second surface 12 is less than 1.6.

[0044] In the present invention, the roughness of the carrier body is less than 1.6, which is more conducive to reducing the scattering of electromagnetic waves when propagating on the carrier; at the same time, in the present invention, the carrier body and the fixing seat can be made of aluminum. The use of aluminum to prepare the low-scattering carrier is conducive to reducing the scattering of electromagnetic waves when propagating from the target component to the surface of the low-scattering carrier, and the electromagnetic waves propagating on the aluminum material produce less scattering, which is also conducive to reducing the weight of the low-scattering carrier.

[0045] In some embodiments, the carrier body 1 has a length of 1.5 to 2.5 m, a width of 0.8 to 1.5 m, and a height of 0.3 to 0.5 m.

[0046] In the present invention, the length of the carrier body refers to Figure 5 The distance between the first angle and the second angle in the carrier body refers to the height of the carrier body. Figure 6 The distance between the highest point of the first surface and the highest point of the second surface, the width refers to Figure 5 The maximum distance between the first arc and the second arc formed after the mid-horizontal projection.

[0047] In some embodiments, a connecting flange is provided in the first groove 13 , and the fixing seat 2 is installed in the first groove 13 via the connecting flange.

[0048] In the present invention, the fixing base is installed in the first groove by means of a countersunk screw, and the small gap between the fixing base and the first groove is pasted with aluminum foil. This ensures that the connection between the fixing base and the first groove does not have surface discontinuous echo reflection and strong specular reflection, thereby ensuring that the flat-plate structure can more accurately perform RCS measurement and evaluation. The low-scattering carrier for RCS testing provided in the present invention and the tested flat-plate target component adopt a conformal, step-free structure design and are tightly connected, which not only eliminates the edge scattering of the flat-plate structure, but also shields its outer surface structure and better simulates the state of the actual installation of the flat-plate target component. Aluminum foil is pasted at the connection gap, etc., so that the flat-plate target component can perform RCS measurement and evaluation more accurately in the full band. At the same time, the low-scattering carrier in the present invention can be used in most target test fields to accurately test and evaluate the RCS of the flat-plate target component. The patent of the present invention is reliable and applicable, easy to promote, and has good economic benefits.

[0049] 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.

[0050] 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: include: The carrier body has an outwardly convex first surface and a second surface, the first surface and the second surface being seamlessly connected to form a double teardrop-shaped spliced structure. A portion of the first surface is inwardly recessed to form a first groove. A connecting flange is provided in the first groove, and a fixing seat is mounted in the first groove via the connecting flange. The first surface includes a smooth curved surface and a flat surface, the smooth curved surface and the flat surface having a continuous transition through curvature, and a portion of the flat surface is inwardly recessed to form the first groove. The horizontal projection of the carrier body includes a first arc and a second arc, the first arc and the second arc have opposite curvature directions, and the tangents of the two endpoints of the first arc intersect with the tangents of the two endpoints of the second arc to form a first angle and a second angle; the first angle is 50 to 90 degrees, and the second angle is 80 to 120 degrees; A fixing seat is installed in the first groove, and a portion of the outer surface of the fixing seat is recessed inward to form a second groove, and the second groove is used to install a target component for RCS testing; the outer surface of the fixing seat is flush with the plane; and the target component is a flat target component.

2. The low-scattering carrier according to claim 1, characterized in that: The connection point between the first surface and the second surface is located in the same horizontal plane, and the angle between the first surface and the horizontal plane and the angle between the second surface and the horizontal plane are both 0° to 5°.

3. The low-scattering carrier according to claim 1, characterized in that: The roughness of the first surface and the second surface are both less than 1.

6.

4. The low-scattering carrier according to claim 1, characterized in that The carrier body has a length of 1.5 to 2.5 m, a width of 0.8 to 1.5 m, and a height of 0.3 to 0.5 m.

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