A low-scattering carrier for RCS testing

Abstract

The present application relates to the RCS test technical field, especially to a kind of low scattering carrier for RCS test, including carrier body, the carrier body has the upper surface and lower surface of outward bulge, the upper surface and the lower surface are seamlessly connected and about its interface mirror symmetry, to make the carrier body form the hollow cavity of the shape of right trapezoid;The right angle of the upper surface and the lower surface is inwardly recessed to form first recess, and the first recess is used to install dihedral-like reflector for RCS test.The low scattering carrier provided by the present application is designed with conformal no-step difference structure on the upper surface and the lower surface and the outer surface of dihedral-like reflector, and is closely connected, which eliminates the multipath surface reflection effect of dihedral-like reflector and the six edges of dihedral-like reflector diffraction, also shields its internal structure, and better simulates the state that dihedral-like reflector is actually installed on aircraft, to realize the accurate measurement and evaluation of dihedral-like reflector for RCS.

Description

Technical Field

[0001] This invention relates to the field of RCS testing technology, and more particularly to a low-scattering carrier for RCS testing. Background Technology

[0002] With the development of radar detection technology, optimizing the shape and layout of aircraft for radar stealth has become essential to improve their survivability. Therefore, research on the stealth of aircraft components is a prerequisite and an inevitable measure for assessing the overall stealth characteristics of an aircraft.

[0003] Once the dihedral reflector is detached from the aircraft body, the edges, surfaces, and cavities that were originally shielded by the aircraft body will be exposed to radar waves. If no measures are taken, this will have a serious impact on the testing and evaluation of the dihedral reflector.

[0004] In related technologies, low-scattering carriers are not suitable for RCS (Radar Cross Section) testing of dihedral reflectors in aircraft components. Therefore, there is an urgent need to provide a low-scattering carrier for RCS testing of dihedral reflectors. Summary of the Invention

[0005] This invention designs a low-scattering carrier for RCS testing of dihedral reflectors, enabling more accurate RCS measurement and evaluation of dihedral reflectors.

[0006] This invention provides a low-scattering carrier for RCS testing, characterized in that it includes a carrier body having an outwardly protruding upper surface and a lower surface, the upper surface and the lower surface being seamlessly connected and mirror-symmetrical about their interface, so that the carrier body forms a hollow cavity with a right-angled trapezoidal shape.

[0007] The right-angled edges of the upper and lower surfaces are recessed inward to form a first groove, which is used to install a dihedral reflector for RCS testing.

[0008] In one possible design, both the upper and lower surfaces are smooth curved surfaces.

[0009] In one possible design, the roughness of both the upper and lower surfaces is less than 1.6.

[0010] In one possible design, the horizontal projection of the carrier body includes a first included angle, a second included angle, a third included angle, and a fourth included angle. The first included angle is a sharp angle with an angle of 45 to 90 degrees. The second included angle, the third included angle, and the fourth included angle are all rounded angles with a radius of 200 to 1000 mm.

[0011] In one possible design, the maximum diagonal dimension of the carrier body is 4 to 6 m, the dimension of the right-angled side of the carrier body is 3 to 4 m, and the distance between the highest point of the upper surface and the lowest point of the lower surface is 0.3 to 0.8 m.

[0012] In one possible design, the curvature of the upper and lower surfaces is continuous with that of the outer surface of the dihedral reflector-like device, and there is no surface step difference between the upper and lower surfaces and the outer surface of the target component.

[0013] In one possible design, a flange is provided in the first groove, and the dihedral reflector is mounted in the first groove through the flange.

[0014] Compared with the prior art, the present invention has at least the following beneficial effects:

[0015] In this invention, the curvature of the upper and lower surfaces of the carrier body is relatively continuous and there are no cavities or other structures. There are no strong scattering sources such as specular reflection or multiple reflections on the surface, which has a good surface current guiding effect. The carrier body and the dihedral reflector under test are tightly connected by a conformal stepless structure, which not only eliminates the multipath reflection effect and the dihedral reflector's six edge diffraction, but also blocks its internal structure and better simulates the state of the dihedral reflector when it is actually installed, thereby achieving accurate evaluation of the RCS of the dihedral reflector. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a low-scattering carrier for RCS testing of a dihedral reflector according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of a dihedral reflector according to an embodiment of the present invention;

[0019] Figure 3 This is a side view schematic diagram of a low-scattering carrier for RCS testing provided in an embodiment of the present invention;

[0020] Figure 4This is a top view of a low-scattering carrier for RCS testing of a dihedral reflector according to an embodiment of the present invention.

[0021] Figure 5 This is a horizontal projection image of a low-scattering carrier for RCS testing provided in an embodiment of the present invention;

[0022] Figure 6 This is a slanted view of a low-scattering carrier for RCS testing provided in an embodiment of the present invention.

[0023] Figure label:

[0024] 1-Carrier body; 2-Dihedral reflector; 11-Upper surface; 12-Lower surface; 13-First groove; 14-Interface; A-First included angle; B-Second included angle; C-Third included angle; D-Fourth included angle. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0026] After an aircraft completes its overall stealth design, the radar cross-section (RCS) of each component needs to be evaluated. However, once these components are separated from the main body, structures such as edges, surfaces, and cavities that were previously shielded by the aircraft body are exposed to radar waves. Without any intervention, these exposed structures will severely impact target testing and evaluation. Dihedral reflectors are one type of aircraft component. To more accurately evaluate the RCS of each component, the inventors creatively designed a low-scattering carrier for RCS testing of dihedral reflectors. This carrier shields the edges, surfaces, and cavities of the dihedral reflector that were originally shielded by the aircraft body, simulating its actual installation state without affecting the RCS testing of the dihedral reflector.

[0027] The low-scattering carrier for RCS testing provided in the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0028] like Figures 1 to 3As shown, this embodiment of the invention provides a low-scattering carrier for RCS testing. The low-scattering carrier includes a carrier body 1, which includes an outwardly protruding upper surface 11 and a lower surface 12, a dihedral reflector 2, and a first groove 13 for mounting the dihedral reflector 2 for RCS testing. The upper surface 11 and the lower surface 12 are both smooth curved surfaces and are mirror-symmetrical about their interface 14. The entire carrier body 1 forms a hollow cavity with a right-angled trapezoidal shape.

[0029] In this embodiment of the invention, the upper surface 11 and the lower surface 12 of the carrier have high surface smoothness, the roughness Ra (arithmetic mean deviation of profile) of the upper surface 11 and the lower surface 12 is less than 1.6, and all the seams of the upper surface 11 and the lower surface 12 are very small and there is no surface step difference.

[0030] To meet the requirements of RCS testing for dihedral reflectors, this invention designs the upper surface 11 and lower surface 12 as seamlessly connected and symmetrical about the interface 14, so that the carrier body 1 forms a hollow cavity structure with a right-angled trapezoidal shape. This structure ensures that the installation angle and state of the dihedral reflector 2 during testing are the same as those actually installed on the aircraft body. At the same time, the surface curvature of the carrier body 1 is relatively continuous and there are no concave cavities or other structures, so there are no strong scattering sources such as specular reflection or multiple reflections on the surface, which has a good surface current guiding effect. Furthermore, the carrier body 1 has low scattering characteristics relative to the dihedral reflector 2 being tested, which has little impact on the evaluation of the target. In addition, in actual testing, the size and weight of the carrier body 1 are within the testing capability range of most experimental platforms, making it easy to operate.

[0031] like Figure 5 As shown in the embodiment of the present invention, the horizontal projection of the carrier body 1 includes a first included angle A, a second included angle B, a third included angle C and a fourth included angle D. The first included angle A is a apex included angle with a degree of 45 to 90°. The second included angle B, the third included angle C and the fourth included angle D are all arc angles with a radius of 200 to 1000 mm.

[0032] In this embodiment of the invention, to ensure that the carrier body 1 has low scattering in the required angular region, the forward angle of the carrier is designed as a pointed included angle, and to reduce cusp and vertically polarized traveling wave scattering, the backward angle is designed as a rounded angle. The forward angle is composed of two straight lines forming a pointed included angle; the backward angle is composed of a curve, that is, the forward angle of the carrier body 1 is the first included angle A, and the backward angles are successively the second included angle B, the third included angle C, and the fourth included angle D. In practical applications, the first included angle A is between 45 degrees and 90 degrees in the horizontal direction. According to electromagnetic scattering theory, the forward angle of the carrier determines the low scattering angular region of the low-scattering carrier. Therefore, for specific RCS angular region size requirements, selecting a suitable forward angle is extremely important.

[0033] like Figure 3 and Figure 4 As shown, in this embodiment of the invention, the maximum dimension (i.e., length) of the diagonal of the carrier body 1 is 4 to 6 m, the dimension (i.e., width) of the right-angled side of the carrier body 1 is 3 to 4 m, and the distance (i.e., height) between the highest point of the upper surface 11 of the carrier body 1 and the lowest point of the lower surface 12 of the carrier body 1 is 0.3 to 0.8 m.

[0034] like Figure 1 and Figure 2 As shown, in this embodiment of the invention, the curvature of the upper surface 11 and the lower surface 12 is continuous with that of the outer surface of the dihedral reflector 2, and there is no surface step difference between the upper surface 11 and the lower surface 12 and the outer surface of the dihedral reflector 2.

[0035] In this embodiment of the invention, the outer surfaces of the carrier body 1 and the dihedral reflector 2 are conformally designed without any step difference, and they are tightly connected. Furthermore, the curvature of the outer surface of the dihedral reflector 2 and the upper and lower surfaces 11 and 12 of the carrier body 1 are continuous. This design eliminates the multipath reflection effect and the six-edge diffraction of the dihedral reflector 2, while also obscuring the internal structure of the dihedral reflector 2. It also better simulates the actual installation state of the dihedral reflector 2, thereby enabling more accurate RCS measurement and evaluation. During actual testing, after the target and carrier are installed, simple treatment of the connection seams on the carrier with aluminum foil is sufficient to ensure that there are no surface discontinuities causing retroreflection or strong specular reflection sources at the connection point.

[0036] like Figure 1 , Figure 2 and Figure 6 As shown in the embodiment of the present invention, a flange is provided in the first groove 13, and the dihedral reflector 2 is installed in the first groove 13 through the flange.

[0037] In this embodiment of the invention, a flange interface (i.e., a flange interface is provided on the surface of the first groove 13) at the inner surface where the upper surface 11 and lower surface 12 meet the outer surface of the dihedral reflector 2, for connecting the dihedral reflector 2 to the carrier. When testing the dihedral reflector 2, it is connected to the upper surface 11 and lower surface 12 via the connecting flange. This re-shields the edges, surfaces, and cavities exposed by the dihedral reflector 2 after detaching from the aircraft body, ensuring the accuracy of the RCS when evaluating the dihedral reflector 2. The outer surface of the dihedral reflector 2 and the upper surface 11 and lower surface 12 of the carrier body 1 are flush and without step difference at the joint, and the surface curvature is continuous. In actual testing, aluminum foil is pasted into the small gap between them for treatment, which ensures that there are no discontinuous echo reflections or strong specular reflection sources at the connection point.

[0038] This invention designs a low-scattering carrier for RCS testing of a dihedral reflector 2. The carrier body 1 has an outwardly convex upper surface 11 and a lower surface 12, which are seamlessly connected and mirror-symmetrical about their interface 14, so that the carrier body 1 forms a hollow cavity with a right-angled trapezoidal shape. The carrier body 1 and the dihedral reflector 2 under test adopt a conformal stepless structure design, and the outer surface of the dihedral reflector 2 is tightly connected to the upper surface 11 and the lower surface 12 of the carrier body 1 with continuous surface curvature. This eliminates the multipath reflection effect and the dihedral reflector 2's six-edge diffraction, and also blocks the internal structure of the dihedral reflector 2, and better simulates the state of the dihedral reflector 2 when it is actually installed on the aircraft body, thereby enabling more accurate RCS measurement and evaluation of the dihedral reflector 2. The aforementioned carrier body 1 can be used in most target testing ranges to accurately test and evaluate the RCS of dihedral reflector 2 targets. This invention is reliable, applicable, easy to promote, and has good economic benefits.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low-scattering carrier for RCS testing, characterized by, Includes a carrier body, the carrier body having an outwardly protruding upper surface and a lower surface, the upper surface and the lower surface being seamlessly connected and mirror-symmetrical about their interface, so that the carrier body forms a hollow cavity with a right-angled trapezoidal shape; The curvature of the upper and lower surfaces is continuous with that of the outer surface of the dihedral reflector, and there is no surface step difference between the upper and lower surfaces and the outer surface of the dihedral reflector. The horizontal projection of the carrier body includes a first included angle, a second included angle, a third included angle, and a fourth included angle. The first included angle is a sharp angle with an angle of 45 to 90 degrees. The second included angle, the third included angle, and the fourth included angle are all rounded angles with a radius of 200 to 1000 mm. The right-angled sides of the upper and lower surfaces are recessed inward to form a first groove, which is used to install a dihedral reflector for RCS testing. A flange is provided in the first groove, and the dihedral reflector is installed in the first groove through the flange.

2. The low-scattering carrier of claim 1, wherein, Both the upper and lower surfaces are smooth curved surfaces.

3. The low-scattering carrier of claim 1, wherein, The roughness of both the upper and lower surfaces is less than 1.

6.

4. The low-scattering carrier of claim 1, wherein, The maximum diagonal dimension of the carrier body is 4~6m, the dimension of the right-angled side of the carrier body is 3~4m, and the distance between the highest point of the upper surface and the lowest point of the lower surface is 0.3~0.8m.

Images