Low-scattering carrier for planar target RCS (radar cross section) test

Abstract

The invention provides a low-scattering carrier for a planar target RCS test, and relates to the technical field of target far-field electromagnetic scattering characteristic test, and the low-scattering carrier is a hollow structure formed by seamless connection of an upper surface and a lower surface; the overall appearance of the low-scattering carrier is in a flat peach kernel shape comprising two tips; the upper surface is provided with a detachable flat plate which is continuous with the curvature of the upper surface; a connecting piece used for installing and fixing a planar target is arranged at the connecting position of the upper surface and the detachable flat plate. The low-scattering carrier has low radar back scattering in a large angular domain range, when the low-scattering carrier is used for a planar target RCS test, edge diffraction of a planar target can be eliminated, the internal structure of the planar target is shielded, the state of the planar target in actual installation can be well simulated, and the precision of the planar target RCS test is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of far-field electromagnetic scattering characteristic testing of targets, and particularly relates to a low-scattering carrier for RCS testing of planar targets. Background Art

[0002] In recent years, with the development of radar detection technology, in order to improve the survivability of aircraft, it has become very necessary to optimize the low-scattering design of the aircraft's external layout. However, after the overall low-scattering design of the aircraft is completed in the existing technology, most of them adopt the component-level disassembly and evaluation method. When the target is separated from the structure, the original edges, surfaces, cavities and other structures that did not exist before will be exposed to the radar wave irradiation. If no treatment measures are taken, these exposed structures will have a serious impact on the test and evaluation of the target. In order to more accurately evaluate the RCS index of target components, it is necessary to block the original edges, surfaces, cavities and other structures that did not appear before and simulate their actual installation states. Summary of the Invention

[0003] Aiming at one or more problems existing in the prior art, the present invention provides a low-scattering carrier for RCS testing of planar targets. The low-scattering carrier has low-scattering characteristics in both the front and rear directions within a wide angular range, and has little influence on the evaluation of the target. It adopts a conformal and seamless structure design with the upper surface of the planar target, and the two are tightly connected. It not only eliminates the edge scattering of the planar target, but also blocks the external surface structure that was originally embedded, and can better simulate the state of the planar target during actual installation, improve the accuracy of RCS testing of the planar target, is applicable to the accurate test and evaluation of RCS of most planar targets, and is easy to promote.

[0004] The present invention provides a low-scattering carrier for RCS testing of planar targets. The low-scattering carrier is a hollow structure formed by seamlessly connecting the upper surface and the lower surface; the upper surface includes a smooth curved surface with continuous curvature and a plane; the lower surface is a smooth curved surface; the overall shape of the low-scattering carrier is a flat peach-shaped with two tips; a detachable flat plate is provided on the plane part of the upper surface; a connecting member for installing and fixing the planar target is provided at the connection of the detachable flat plate.

[0005] In a possible design, the roughness of the upper surface and the lower surface is less than 1.6.

[0006] In a possible design, the included angle between the two tips of the low-scattering carrier in the horizontal direction is 40-120°.

[0007] In a possible design, the included angle of the front tip of the low-scattering carrier in the horizontal direction is not greater than the included angle of the rear tip of the low-scattering carrier in the horizontal direction.

[0008] In a possible design, the included angle of the front tip of the low-scattering carrier in the horizontal direction is 60°.

[0009] In a possible design, the included angle of the rear tip of the low-scattering carrier in the horizontal direction is 60°.

[0010] In a possible design, the included angle between the plane where the connection of the upper surface and the lower surface is located and the horizontal plane is not greater than 5°.

[0011] In a possible design, the length of the low-scattering carrier is 7 to 10 times its height.

[0012] In a possible design, the length of the low-scattering carrier is 1 to 5 m, the width is 0.5 to 2 m, and the height is 0.2 to 0.8 m.

[0013] In a possible design, the connecting piece is a flange interface.

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

[0015] The overall shape of the low-scattering carrier provided by the present invention is a flat peach kernel shape including two tips, which can ensure that the low-scattering carrier has low-scattering characteristics in a wide angular range in the front and rear directions. The surface of the low-scattering carrier has no step difference and continuous curvature, and there is no structure such as a concave cavity, and there is no strong scattering source such as specular reflection and multiple reflections on the surface, and it has a good surface current guiding effect. A detachable flat plate is provided on the upper surface, and a connecting piece for installing and fixing a planar target is provided at the connection between the upper surface and the detachable flat plate. When performing the RCS test of the planar target, the detachable flat plate is removed and the planar target is installed, which can ensure that the surface of the planar target has no step difference and continuous curvature with the upper surface and is tightly connected. It can not only block the structure that was originally exposed when the planar target was not separated from the overall structure, but also avoid the echo reflection of surface discontinuity and strong specular reflection sources at the connection. In this way, the state of the planar target during actual installation can be better simulated, and the RCS of the planar target can be measured and evaluated more accurately.

[0016] The low-scattering carrier of the present invention has low-scattering characteristics in a wide angular range in the front and rear directions, and has little influence on the evaluation of the target. It adopts a conformal and step-free structure design with the upper surface of the planar target, and the two are tightly connected. It not only eliminates the edge scattering of the planar target, but also blocks its originally embedded outer surface structure. It can better simulate the state of the planar target during actual installation, improve the accuracy of the RCS test of the planar target, is applicable to the accurate test and evaluation of the RCS of most planar targets, and is easy to promote. Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 is a schematic structural diagram of a low-scattering carrier provided by the present invention for planar target RCS testing;

[0019] Figure 2 is a top view of a low-scattering carrier provided by the present invention for planar target RCS testing;

[0020] Figure 3 is a side view of a low-scattering carrier provided by the present invention for planar target RCS testing;

[0021] Figure 4 is an axonometric view of a low-scattering carrier provided by the present invention for planar target RCS testing.

[0022] Reference numerals:

[0023] 11 - upper surface; 12 - lower surface; 111 - connecting member; 112 - detachable flat plate; 2 - planar target. Detailed implementation manners

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0025] The present invention provides a low-scattering carrier for planar target RCS testing, as Figure 1 shown. The low-scattering carrier is a hollow structure formed by seamlessly connecting an upper surface 11 and a lower surface 12; the upper surface 11 includes a smooth curved surface with continuous curvature and a plane; the lower surface 12 is a smooth curved surface; the overall shape of the low-scattering carrier is a flat peach-shaped with two tips; a detachable flat plate 112 is provided on the planar part of the upper surface 11; a connecting member 111 for installing and fixing the planar target 2 is provided at the connection of the detachable flat plate 112.

[0026] It should be noted that the planar target refers to a target with a planar upper surface, and the upper surface of the planar target is flush with the planar part of the upper surface of the low-scattering carrier.

[0027] The overall shape of the low-scattering carrier provided by the present invention is a flat peach pit shape with two tips, which can ensure that the low-scattering carrier has low-scattering characteristics in the front and rear directions within a wide angular range. The surface of the low-scattering carrier has no step difference and continuous curvature, no concave cavity and other structures, and there is no strong scattering source such as specular reflection and multiple reflections on the surface, and it has a good surface current guiding effect. A detachable flat plate is provided on the upper surface, and a connecting member for installing and fixing a planar target is provided at the connection between the upper surface and the detachable flat plate. When performing the RCS test of the planar target, the detachable flat plate is removed and the planar target is installed, which can ensure that the surface of the planar target is flush with the upper surface, has continuous curvature and is tightly connected. This can not only block the structure that was originally exposed when the planar target was not detached from the overall structure, but also avoid echo reflection and strong specular reflection sources caused by surface discontinuity at the connection. In this way, the state of the planar target during actual installation can be better simulated, and the RCS of the planar target can be measured and evaluated more accurately.

[0028] In some preferred embodiments, the roughness of the upper surface 11 and the lower surface 12 is less than 1.6. The roughness of the upper surface and the lower surface of the low-scattering carrier of the present invention is less than 1.6 (profile arithmetic mean deviation), which is more conducive to reducing the scattering generated when electromagnetic waves propagate on the carrier.

[0029] In some preferred embodiments, the angle between the two tips of the low-scattering carrier in the horizontal direction is 40-120°.

[0030] The tips of the low-scattering carrier of the present invention can be composed of straight lines and curves. When composed of straight lines, the angle between the two straight lines is the tip angle; when the tip is composed of curves, the angle formed by the tangents along the curve forms the tip angle. The sizes of the front and rear angles of the low-scattering carrier determine the low-scattering angular range of the low-scattering carrier. For special requirements for the size of the RCS angular range, it is extremely important to select an appropriate tip angle. Therefore, as Figure 2 shown, both ends of the low-scattering carrier of the present invention are tips, and setting the tip angle within the above range can ensure that the low-scattering carrier has low-scattering performance in the front and rear directions within a wide angular range.

[0031] In some preferred embodiments, the angle of the front tip of the low-scattering carrier in the horizontal direction is not greater than the angle of the rear tip of the low-scattering carrier in the horizontal direction.

[0032] In some preferred embodiments, the angle of the front tip of the low-scattering carrier in the horizontal direction is 60°.

[0033] In some preferred embodiments, the angle of the rear tip of the low-scattering carrier in the horizontal direction is 60°.

[0034] In some preferred embodiments, the angle between the plane where the connection of the upper surface 11 and the lower surface 12 is located and the horizontal plane is not greater than 5°. As Figure 3 shown, in this embodiment, the angle between the plane where the connection of the upper surface and the lower surface of the low-scattering carrier is located and the horizontal plane is not greater than 5°. In this way, it can make the connection between the upper surface and the detachable flat plate at this angle easier, and at the same time ensure that the actual installation angle and state of the planar target remain unchanged.

[0035] In some preferred embodiments, the length of the low-scattering carrier is 7 to 10 times its height. Controlling the length-to-height ratio of the flat peach-shaped low-scattering carrier provided by the present invention within the above range can ensure that the low-scattering carrier has low-scattering characteristics.

[0036] In some preferred embodiments, the low-scattering carrier has a length of 1 to 5 m, a width of 0.5 to 2 m, and a height of 0.2 to 0.8 m. The length of the low-scattering carrier of the present invention refers to Figure 2 the maximum distance in the horizontal direction in Figure 2 ; the width refers to Figure 3 the maximum distance in the vertical direction in

[0037] In some preferred embodiments, the connecting member is a flange interface. The low-scattering carrier of the present invention is provided with a flange interface at the connection of the upper surface and the detachable flat plate for connecting the low-scattering carrier with the planar target and the detachable flat plate; the planar target is installed on the connecting flange interface through countersunk head screws. The detachable flat plate is used as a replacement for the planar target for RCS test and evaluation of the low-scattering carrier.

[0038] The surface curvature of the low-scattering carrier provided by the present invention is continuous and there are no concave cavity structures or the like, and there are no strong scattering sources such as specular reflection and multiple reflections on the surface, and it has a good surface current guiding effect. The overall shape is a flat peach shape with two tips, which can ensure that the low-scattering carrier has low-scattering characteristics in a wide angular range in the front and rear directions. When verifying the carrier, the carrier has low-scattering characteristics relative to the tested planar target and has little influence on the evaluation of the target. In actual tests, the RCS of the low-scattering carrier is far better than that of the flat plate-like tested target. As Figure 4As shown in the figure, a detachable flat plate is provided on the upper surface of the low-scattering carrier. A connecting member for installing and fixing a planar target is provided at the connection between the upper surface and the detachable flat plate. When performing the RCS test of the planar target, the detachable flat plate is removed, the planar target is installed, and the planar target is placed inside the carrier with a hollow structure. This shields the structure that was originally exposed when the target was not detached from the overall structure, ensuring the accuracy of the RCS during target evaluation. The surface of the planar target is flush with the upper surface at the joint, without a step difference, and the curvature is continuously and tightly connected. Aluminum foil is pasted at the small gap between the two to ensure that there will be no echo reflection of surface discontinuity and strong specular reflection sources at the connection. By adjusting the forward and backward directions of the target to be installed respectively with the forward direction of the carrier, the forward and backward RCS of the target can be evaluated. In addition, the size and weight of the above-mentioned low-scattering carrier provided by the present invention are within the test capabilities of most experimental platforms, which is convenient for operation, suitable for accurate RCS test evaluation of most planar targets, and easy to promote.

[0039] In summary, the low-scattering carrier provided by the present invention has low-scattering characteristics in both the forward and backward directions within a relatively wide angular range, and has little impact on the target evaluation. It adopts a conformal and step-free structure design with the upper surface of the planar target, and the two are tightly connected. This not only eliminates the edge scattering of the planar target but also shields its originally embedded outer surface structure, can better simulate the actual installation state of the planar target, improves the accuracy of the RCS test of the planar target, is suitable for accurate RCS test evaluation of most planar targets, and is easy to promote.

[0040] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, terms such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; unless otherwise specified or stated, the term "multiple groups" means two or more groups; terms such as "connection" and "fixation" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the description of this specification, it should be understood that the orientation terms such as "upper" and "lower" described in the embodiments of the present invention are described from the angles shown in the drawings and should not be construed as limiting the embodiments of the present invention. In addition, in the context, it should also be understood that when it is mentioned that an element is connected "above" or "below" another element, it can not only be directly connected "above" or "below" another element, but also be indirectly connected "above" or "below" another element through an intermediate element.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low-scattering carrier for planar target RCS testing, characterized in that, The low-scattering carrier is a hollow structure formed by seamlessly connecting the upper surface and the lower surface; the upper surface includes a smooth curved surface and a plane with continuous curvature; the lower surface is a smooth curved surface; the overall shape of the low-scattering carrier is a flat peach pit shape with two tips; a detachable flat plate is provided on the plane part of the upper surface; a connecting piece for installing and fixing a planar target is provided at the connection of the detachable flat plate.

2. The low-scattering carrier according to claim 1, wherein The roughness of the upper surface and the lower surface is less than 1.

6.

3. The low-scattering carrier according to claim 1, characterized in that, The angle between the two tips of the low-scattering carrier in the horizontal direction is 40-120°.

4. The low-scattering carrier according to claim 3, characterized in that, The angle of the front tip of the low-scattering carrier in the horizontal direction is not greater than the angle of the rear tip of the low-scattering carrier in the horizontal direction.

5. The low-scattering carrier according to claim 4, wherein The angle of the front tip of the low-scattering carrier in the horizontal direction is 60°.

6. The low-scattering carrier according to claim 4, wherein The angle of the rear tip of the low-scattering carrier in the horizontal direction is 60°.

7. The low-scattering carrier according to claim 1, wherein The angle between the plane where the upper surface and the lower surface are connected and the horizontal plane is not greater than 5°.

8. The low-scattering carrier according to claim 1, characterized in that, The length of the low-scattering carrier is 7-10 times its height.

9. The low-scattering carrier according to claim 8, wherein, The low-scattering carrier has a length of 1-5 m, a width of 0.5-2 m, and a height of 0.2-0.8 m.

10. The low-scattering carrier according to claim 1, wherein The connecting piece is a flange interface.

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