A low-scattering carrier for RCS testing

Abstract

The application provides a low-scattering carrier for RCS test, relates to the technical field of electromagnetic scattering characteristic measurement, and is a hollow structure made of hard wave-absorbing foam, comprising a carrier main body and a carrier tip which are detachably connected. The carrier main body and the carrier tip are smoothly connected through curvature. The carrier tip is in the shape of a sharp cone. One end of the carrier main body is an open end, and the other end is a carrier trailing edge which is outwardly convex. The open end is used for placing a target component in the cavity inside the carrier main body when the RCS of the target component is tested, and is smoothly connected with the target component. The carrier trailing edge is in the shape of a hemisphere. The low-scattering carrier provided by the application can have very low backscattering in a large angle range, and the average RCS can reach-35dBm 2 The scattering suppression effect of the carrier is suitable for L to Ku bands, and the problem of poor low-frequency electromagnetic wave scattering suppression effect of a traditional metal carrier is effectively solved.

Description

Technical Field

[0001] This invention belongs to the field of electromagnetic scattering characteristic measurement technology, and specifically relates to a low-scattering carrier for RCS testing. Background Technology

[0002] A low-scattering carrier is a tooling fixture used for RCS testing of components. The low-scattering carrier itself has low RCS performance and can effectively shield the edges and embedded structures of the components, so as to realize the measurement and evaluation of the true radar scattering characteristics of the components under simulated assembly target conditions.

[0003] Traditional low-scattering carriers for testing large cavity targets are mostly metallic. Their design deflects strong scattering, such as specular reflection and edge diffraction, away from the angle of interest, and by adjusting the shape of the metallic carrier, the scattering peaks can be concentrated in irrelevant regions. In recent years, with the rapid development of low-observable technologies, the technical requirements for low-scattering carriers used for target RCS testing have become increasingly stringent, especially for low-frequency (P and L band) RCS testing. Traditional low-scattering metallic carriers, relying solely on shape design, often show significant suppression of high-frequency scattering but poor suppression of low-frequency scattering, and can no longer meet the needs of low-frequency RCS testing and evaluation of target components.

[0004] Therefore, there is an urgent need to provide a low-scattering carrier that can effectively suppress low-frequency scattering. Summary of the Invention

[0005] To address the problem of poor low-frequency scattering suppression in existing low-scattering carriers, this invention provides a low-scattering carrier for RCS testing. The low-scattering carrier provided by this invention exhibits very low backscattering over a wide angular range, with an average RCS of -35 dBm. 2 Its scattering suppression effect covers the L to Ku bands, effectively solving the problem of poor low-frequency electromagnetic wave scattering suppression effect of traditional metal carriers.

[0006] This invention provides a low-scattering carrier for RCS testing. The low-scattering carrier is a hollow structure made of rigid absorbing foam, including a detachably connected carrier body 1 and a carrier tip 2. The carrier body 1 and the carrier tip 2 are smoothly transitioned by curvature. The carrier tip is conical. One end of the carrier body 1 is an open end, and the other end is an outwardly protruding carrier trailing edge. The open end is used to place the target component 3 inside the cavity 11 of the carrier body 1 when testing the RCS of the target component, and to smoothly connect with the target component. The carrier trailing edge is hemispherical.

[0007] In one possible design, the included angle of the carrier tip 2 is 40 to 80°.

[0008] In one possible design, the radius of the hemisphere is 600–800 mm; and / or

[0009] The thickness of the sidewalls of the carrier body is 100-300 mm.

[0010] In one possible design, the horizontal projection of the carrier body 1 is an axisymmetric figure formed by connecting the first arc 101, the first straight line 102, the second arc 103, the second straight line 104, the third arc 105, and the third straight line 106 end to end; the first arc 101, the second arc 103, and the third arc 105 all curve outward; adjacent arcs and straight lines are smoothly connected by curvature.

[0011] In one possible design, the horizontal projection of the sidewall of cavity 11 includes a fourth straight line 107 and a fifth straight line 108 that are parallel to each other.

[0012] The angle between the fourth straight line 107 and the first circular arc 101 is 30° to 50°; and / or

[0013] The angle between the fifth straight line 108 and the third circular arc 105 is 30° to 50°.

[0014] In one possible design, the first arc 101 and the third arc 105 are symmetrically distributed and of the same size; and / or

[0015] The second arc 103 is a semicircle.

[0016] In one possible design, the radii of the first arc 101 and the third arc 105 are 300–500 mm; and / or

[0017] The radius of the second arc 103 is 600-800 mm.

[0018] In one possible design, the horizontal projection of the low-scattering carrier is an axisymmetric figure formed by the sequential connection of the sixth straight line 201, the fourth arc 202, the first straight line 102, the second arc 103, the second straight line 104, the fifth arc 203, and the seventh straight line 204; the fourth arc 202 and the fifth arc 203 both curve outward; adjacent arcs and straight lines are smoothly connected by curvature.

[0019] In one possible design, the fourth arc 202 and the fifth arc 203 are symmetrically distributed and of the same size.

[0020] In one possible design, the radius of the fourth arc 202 is 300–500 mm.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects:

[0022] The low-scattering carrier of this invention is made of low-scattering rigid absorbing foam with radar-absorbing properties. The carrier body and its tip have a smooth transition in curvature. The pointed, conical tip prevents edge scattering peaks in the head-on direction. The straight, swept-back edge effectively reduces traveling wave scattering and avoids fluctuations in the carrier's RCS within the low-scattering angular region. The trailing edge of the carrier is hemispherical with a rounded transition, further reducing traveling wave scattering and avoiding RCS fluctuations within the low-scattering angular region. This invention utilizes a low-scattering shape design incorporating radar-absorbing materials and traveling wave suppression to deflect strong scattering such as specular reflection from the angle of interest, resulting in very low backscattering over a wide angular range, with an average RCS of -35 dBm. 2 Its scattering suppression effect covers the L to Ku bands, effectively solving the problem of poor low-frequency electromagnetic wave scattering suppression effect of traditional metal carriers.

[0023] This invention features an integrated design between the low-scattering carrier and the target component, with a smooth and tight connection. This design eliminates edge scattering and shields the internal structure of the component, effectively simulating the actual operating state of the target component. This allows for more accurate measurement and evaluation of the target component's RCS. Furthermore, compared to traditional metal carriers, the low-scattering carrier made of rigid absorbing foam offers scattering suppression across the L to Ku wave bands, avoiding the impact of external metal surfaces and structures on the accuracy of the target component's RCS test, and reflecting the target component's true radar scattering performance as accurately as possible.

[0024] This invention relates to a rigid absorbing foam with excellent low-frequency electromagnetic wave scattering suppression effect. It has good processability and can be customized in design and processing according to the shape of the target component. It realizes the integrated structural design of low scattering carrier and large-sized target component. The RCS test of the target component can be realized by matching the cavity size of the low scattering carrier with the shape of the target component. This overcomes the problem that the size of the traditional metal carrier is often much larger than the size of the target component in order to completely cover the large target component, shield its exposed parts, and at the same time ensure the suppression of creeping wave scattering. It can effectively reduce the size of the low scattering carrier, saving space and cost.

[0025] The low-scattering carrier provided by this invention is suitable for target components of various shapes and sizes, and is lightweight, inexpensive, has a short processing cycle, is easy to operate, and is convenient for testing and installation. Attached Figure Description

[0026] 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.

[0027] Figure 1 This is a schematic diagram of the structure of the low-scattering carrier provided by the present invention;

[0028] Figure 2 This is a horizontal projection schematic diagram of the carrier body of the low-scattering carrier provided by the present invention;

[0029] Figure 3 This is a cross-sectional schematic diagram of the carrier body of the low-scattering carrier provided by the present invention;

[0030] Figure 4 This is a schematic diagram of the horizontal projection of the low-scattering carrier provided by the present invention;

[0031] Figure 5 This is a cross-sectional schematic diagram of the low-scattering carrier provided by the present invention;

[0032] Figure 6 This is a schematic diagram of the combination of the carrier body and the target component of the low-scattering carrier provided by the present invention;

[0033] Figure 7 This is a measured RCS curve of the low-scattering carrier provided by the present invention in the L-band;

[0034] Figure 8 This is a measured RCS curve of the low-scattering carrier provided by the present invention in the S-band;

[0035] Figure 9 This is a measured RCS curve of the low-scattering carrier provided by the present invention in the C-band;

[0036] Figure 10 This is a measured RCS curve of the low-scattering carrier provided by the present invention in the X-band;

[0037] Figure 11 This is a measured RCS curve of the low-scattering carrier provided by the present invention in the Ku band.

[0038] Figure label:

[0039] 1-Carrier body; 11-Cavity; 101-First arc; 102-First straight line; 103-Second arc; 14-Second straight line; 105-Third arc; 106-Third straight line; 107-Fourth straight line; 108-Fifth straight line;

[0040] 2-Carrier tip; 201-Sixth straight line; 202-Fourth arc; 203-Fifth arc; 204-Seventh straight line;

[0041] 3-Target component;

[0042] r1 - radius of the second arc; r2 - radius of the first arc; r3 - radius of the fourth arc; θ1 - angle between the first arc and the fourth straight line; θ2 - angle between the tip of the carrier; W - thickness of the sidewall of the carrier body. Detailed Implementation

[0043] To make the objectives, 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. 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.

[0044] This invention provides a low-scattering carrier for RCS testing, such as... Figure 1-3 As shown, the low-scattering carrier is a hollow structure made of rigid absorbing foam, including a detachably connected carrier body 1 and carrier tip 2; the carrier body 1 and carrier tip 2 are smoothly transitioned by curvature; the carrier tip is conical; one end of the carrier body 1 is an open end, and the other end is an outwardly protruding carrier trailing edge; the open end is used to place the target component in the cavity 11 inside the carrier body 1 when testing the RCS of the target component, and smoothly connect it with the target component 3; the carrier trailing edge is hemispherical.

[0045] The low-scattering carrier of this invention is made of low-scattering rigid absorbing foam with radar-absorbing properties. The carrier body and its tip have a smooth transition in curvature. The pointed, conical tip prevents edge scattering peaks in the head-on direction. The straight, swept-back edge effectively reduces traveling wave scattering and avoids fluctuations in the carrier's RCS within the low-scattering angular region. The trailing edge of the carrier is hemispherical with a rounded transition, further reducing traveling wave scattering and avoiding RCS fluctuations within the low-scattering angular region. This invention utilizes a low-scattering shape design incorporating radar-absorbing materials and traveling wave suppression to deflect strong scattering such as specular reflection from the angle of interest, resulting in very low backscattering over a wide angular range, with an average RCS of -35 dBm. 2 Its scattering suppression effect covers the L to Ku bands, effectively solving the problem of poor low-frequency electromagnetic wave scattering suppression effect of traditional metal carriers.

[0046] This invention features an integrated design between the low-scattering carrier and the target component, with a smooth and tight connection. This design eliminates edge scattering and shields the internal structure of the component, effectively simulating the actual operating state of the target component. This allows for more accurate measurement and evaluation of the target component's RCS. Furthermore, compared to traditional metal carriers, the low-scattering carrier made of rigid absorbing foam offers scattering suppression across the L to Ku wave bands, avoiding the impact of external metal surfaces and structures on the accuracy of the target component's RCS test, and reflecting the target component's true radar scattering performance as accurately as possible.

[0047] This invention relates to a rigid absorbing foam with excellent low-frequency electromagnetic wave scattering suppression effect. It has good processability and can be customized in design and processing according to the shape of the target component. It realizes the integrated structural design of low scattering carrier and large-sized target component. The RCS test of the target component can be realized by matching the cavity size of the low scattering carrier with the shape of the target component. This overcomes the problem that the size of the traditional metal carrier is often much larger than the size of the target component in order to completely cover the large target component, shield its exposed parts, and at the same time ensure the suppression of creeping wave scattering. It can effectively reduce the size of the low scattering carrier, saving space and cost.

[0048] The low-scattering carrier provided by this invention is suitable for target components of various shapes and sizes, and is lightweight, inexpensive, has a short processing cycle, is easy to operate, and is convenient for testing and installation.

[0049] It should be noted that the low-scattering carrier of the present invention is composed of multiple foam blocks bonded together with adhesive to form a blank. When bonding the foam blocks, external force such as a press is required to ensure a solid contact and firm adhesion. Then, the shape and inner cavity of the low-scattering foam carrier are processed on a carving machine according to the design dimensions of the carrier and the shape dimensions of the target to be covered. The low-scattering carrier after processing according to the design shape of the low-scattering carrier and the shape and size requirements of the target component can completely accommodate large-sized target components, so that they do not interfere with other components and play a good supporting and protective role. In some preferred embodiments of the present invention, the rigid absorbing foam is a rigid absorbing polypropylene plastic foam material.

[0050] In some preferred embodiments of the present invention, the included angle θ2 of the carrier tip 2 is 40 to 80°.

[0051] In order to ensure that the target's azimuth angle range of 0±45° is a low scattering angle range and to leave a certain margin, the present invention designs the carrier tip angle to be 40-80°, preferably 70°, so that the position of the edge strong scattering peak is shifted to more than 45°, deviating from the head-facing region by more than 15°.

[0052] In some preferred embodiments of the present invention, the radius r1 of the hemisphere is 600–800 mm; the trailing edge of the carrier of the present invention is hemispherical, and the transition between it and the side of the carrier body is an arc, which can reduce the contribution of traveling wave scattering and effectively avoid fluctuations in the carrier RCS in the low scattering angle domain. and / or

[0053] The sidewall thickness W of the carrier body is 100-300 mm. The present invention controls the sidewall thickness of the low-scattering carrier (i.e., the distance between the inner sidewall of the cavity and the outer sidewall of the carrier) within the above range, which can ensure that the low-scattering carrier has excellent low-frequency suppression effect and also ensure that the low-scattering carrier has sufficient support and protection for the target component.

[0054] In some preferred embodiments of the present invention, the horizontal projection and side projection of the carrier body of the low-scattering carrier of the present invention are the same; for example... Figure 2 As shown, the horizontal projection of the carrier body 1 is an axisymmetric figure formed by connecting the first arc 101, the first straight line 102, the second arc 103, the second straight line 104, the third arc 105, and the third straight line 106 end to end; the first arc 101, the second arc 103, and the third arc 105 all curve outward; adjacent arcs and straight lines are smoothly connected by curvature.

[0055] The curved and planar junctions of the low-scattering carrier body of this invention feature a smooth transition through curvature, which helps to reduce traveling wave scattering and decrease the fluctuations in RCS caused by pitch changes. At the same time, the curved surface design at the opening end (corresponding to the first and second circular arcs in projection) allows for a smoother connection with the target component during testing. This smooth connection can eliminate edge scattering of the component and shield the internal cavity structure of the component, thus better simulating the actual working state of the target component. As a result, the RCS of the target component can be measured and evaluated more accurately.

[0056] like Figure 3 As shown, in some preferred embodiments of the present invention, the horizontal projection of the sidewall of cavity 11 includes a fourth straight line 107 and a fifth straight line 108 that are parallel to each other.

[0057] The angle θ1 between the fourth straight line 107 and the first circular arc 101 is 30–50°; and / or

[0058] The angle between the fifth straight line 108 and the third circular arc 105 is 30° to 50°.

[0059] In some preferred embodiments of the present invention, the first arc 101 and the third arc 105 are symmetrically distributed and of the same size; and / or

[0060] The second arc 103 is a semicircle.

[0061] In some preferred embodiments of the present invention, the radius r2 of the first arc 101 is 300–500 mm; and / or

[0062] The radius r1 of the second arc 103 is 600-800 mm.

[0063] In some preferred embodiments of the present invention, the horizontal projection and side projection of the low-scattering carrier of the present invention are the same; such as... Figure 4 As shown, the horizontal projection of the low-scattering carrier is an axisymmetric figure formed by the sixth straight line 201, the fourth arc 202, the first straight line 102, the second arc 103, the second straight line 104, the fifth arc 203, and the seventh straight line 204 connected end to end; the fourth arc 202 and the fifth arc 203 both curve outward; adjacent arcs and straight lines are smoothly connected by curvature.

[0064] The smooth transition of curvature at the junction of the curved surface (corresponding to the curve in the projection) and the plane (corresponding to the straight line in the projection) of the low-scattering carrier surface of the present invention helps to reduce traveling wave scattering and reduce the fluctuation of RCS caused by pitch variation.

[0065] In some preferred embodiments of the present invention, the fourth arc 202 and the fifth arc 203 are symmetrically distributed and are the same size.

[0066] In some preferred embodiments of the present invention, the radius r3 of the fourth arc 202 is 300-500 mm.

[0067] The low-scattering carrier provided by this invention only requires the carrier body when performing RCS testing on the target component. The carrier body is then assembled with the target component for testing. Figure 6 This diagram illustrates the integration of a large target component with a low-scattering carrier body. The carrier body and target component are designed as a single unit, connected tightly by a smooth curvature. This design eliminates edge scattering from the target component and conceals its internal cavity structure, effectively simulating the actual operating state of the target component and allowing for more accurate measurement and evaluation of its RCS. During low-scattering carrier RCS testing, the carrier body and carrier tip are combined and connected via transparent tape. The carrier tip, with its low-scattering shape, is primarily used to conceal the carrier's cavity structure during RCS verification, thus validating the low-scattering performance of the carrier.

[0068] In the description of the embodiments of this invention, unless otherwise expressly specified and limited, the terms "first," "second," "third," "fourth," "fifth," "sixth," "seventh," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple sets" refers to two or more sets; the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0069] In this specification, it should be understood that the directional terms such as "upper" and "lower" used in the description of the embodiments of the present invention are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of the present invention. Furthermore, in the context, it should also be understood that when it is mentioned that one element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0070] 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 they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for 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 in that, The low-scattering carrier is a hollow structure made of rigid absorbing foam, comprising a detachably connected carrier body and a carrier tip; the carrier body and the carrier tip are smoothly transitioned by curvature; the carrier tip is conical; one end of the carrier body is an open end, and the other end is an outwardly convex carrier trailing edge; the open end is used to place the target component inside the cavity of the carrier body when testing the RCS of the target component, and to smoothly connect with the target component; the carrier trailing edge is hemispherical. The included angle of the tip of the carrier is 40~80°; The radius of the hemisphere is 600~800mm; The sidewall thickness of the carrier body is 100~300mm; The horizontal projection of the carrier body is an axisymmetric figure formed by connecting the first arc, the first straight line, the second arc, the second straight line, the third arc, and the third straight line end to end in sequence; the first arc, the second arc, and the third arc all curve outward; adjacent arcs and straight lines are smoothly connected by curvature; The horizontal projection of the cavity sidewall includes a fourth line and a fifth line that are parallel to each other; The angle between the fourth straight line and the first circular arc is 30~50°; The angle between the fifth straight line and the third circular arc is 30~50°; The first arc and the third arc are symmetrically distributed and are the same size; The horizontal projection of the low-scattering carrier is an axisymmetric figure formed by connecting the sixth straight line, the fourth circular arc, the first straight line, the second circular arc, the second straight line, the fifth circular arc, and the seventh straight line end to end in sequence. Both the fourth and fifth arcs curve outwards; adjacent arcs and straight lines are smoothly connected by curvature. The fourth and fifth arcs are symmetrically distributed and are the same size.

2. The low-scattering carrier according to claim 1, characterized in that, The radii of the first and third arcs are 300-500 mm.

3. The low-scattering carrier according to claim 1, characterized in that, The radii of the fourth and fifth arcs are 300-500 mm.

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