A low-radar-cross-section multi-spectrum camouflage net

Abstract

The application discloses a low-RCS multi-spectrum camouflage net, which comprises a multi-spectrum camouflage coating, a radar wave absorption and penetration integrated coating, a first flame-retardant waterproof layer, a base cloth layer, a second flame-retardant waterproof layer and a low-frequency radar wave absorption sketch pattern, and has a six-layer structure. The base cloth layer is coated with the first flame-retardant waterproof layer and the second flame-retardant waterproof layer on two sides respectively, the surface of the first flame-retardant waterproof layer is coated with a lightweight radar wave absorption and penetration integrated coating containing a carbon-silicon absorbent, the surface of the radar wave absorption and penetration integrated coating is printed with the multi-spectrum camouflage coating, and the surface of the second flame-retardant waterproof layer is printed with a lightweight low-frequency radar wave absorption sketch pattern containing a microstructure absorbent. The radar wave absorption and penetration integrated coating is located on the outer side of the camouflage net, and the low-frequency radar wave absorption sketch pattern is located on the inner side of the arch-shaped part of the camouflage net pattern. The application enhances the radar wave absorption performance in the wide frequency range of 1-40 GHz, reduces the target radar wave scattering cross section RCS, is compatible with the multi-spectrum camouflage coating, has low surface density, high strength, good flame retardancy and good weather resistance, and solves the problem that the existing camouflage net cannot be compatible with low RCS and wide-frequency high-efficiency wave absorption.

Description

Technical Field

[0001] This invention relates to the field of camouflage materials technology, specifically to a low RCS multi-spectral camouflage net. Background Technology

[0002] With the rapid development of electronic information technology, military radar detection technology has continuously advanced, with increasing detection range and resolution, and expanding detection frequency bands. Various weapons, fixed targets, and military facilities face serious risks of being detected, identified, tracked, located, and attacked. Using camouflage materials to cover military targets and alter their surface radar characteristics is an effective means of radar camouflage. Generally, changes to the original radar characteristics of a target's surface can, on the one hand, cause "distortion" in the target's radar echo, making target identification difficult or prone to misjudgment; on the other hand, it can weaken the target's radar echo, reducing the target's radar cross-section (RCS), which directly equates to a reduction in radar range, making it difficult for radar to detect the target and achieving radar stealth.

[0003] Traditional camouflage materials, such as metal fiber-based camouflage nets, primarily rely on scattering. By weaving metal fibers into the fabric and using a mesh structure, they achieve strong scattering of electromagnetic waves, reducing radar echo signals and creating camouflage. The camouflage nets from the American company ULCANS use hexagonal and diamond patterns, interconnected by rope loops, and are woven from stainless steel fibers. The Swedish Balajuda multi-band lightweight camouflage net uses double-layered fabric units, with the decorative layer cut into a three-dimensional U-shaped structure, weaving polyurethane fibers with a metallic coating into a ring-shaped mesh. While these scattering-type camouflage nets conceal the target, they also increase the target's radar cross-section (RCS), failing to achieve true radar stealth.

[0004] Currently, some institutions are researching absorptive camouflage nets, which have a certain radar wave attenuation effect on shorter wavelength high-frequency bands such as Ku, Ka, C, and X, but the effect is poor on longer wavelength L and S bands. CN111439000A discloses a lightweight, high-performance multi-spectral camouflage net and its preparation method. The camouflage net consists of a bottom layer and a top layer. The bottom layer is made of a grid of conductive coatings composed of impregnated graphite and carbon black, and the top layer is made of a base fabric coated with conductive coatings composed of graphite and carbon black, which is then pieced together and cut. The camouflage net's absorption performance in the L band can only reach -3 to -6 dB. CN111572109A discloses a stealth material system and its preparation method. Its camouflage net is made by coating a base fabric with an absorbing coating prepared from absorbents such as graphite, carbon black, carbonyl iron powder, and short-cut conductive fibers, and then cutting it. The camouflage net's absorption performance in the 12-40 GHz band reaches -10 dB, but its low-frequency absorption performance is poor.

[0005] This invention proposes a low RCS multi-spectral camouflage net that can solve the above problems, achieving low RCS and wideband high-efficiency radar absorption compatibility of the camouflage net radar absorption performance in a wide frequency range of 1-40 GHz. Summary of the Invention

[0006] The purpose of this invention is to provide a low RCS multi-spectral camouflage network to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a low RCS multi-spectral camouflage network, comprising: Base fabric layer; First flame-retardant and waterproof layer; Second flame-retardant and waterproof layer; A radar wave-absorbing integrated coating is located on the surface of the first flame-retardant and waterproof layer; Low-frequency radar-absorbing grass pattern is located on the surface of the second flame-retardant and waterproof layer; Multi-spectral camouflage coating, located on the surface of the radar wave penetrating integrated coating; The base fabric is coated with a first flame-retardant and a second flame-retardant and waterproof layer on both sides. The surface of the first flame-retardant and waterproof layer is coated with a lightweight radar wave absorbing integrated coating containing a carbon silicon absorber. The surface of the second flame-retardant and waterproof layer is printed with a lightweight low-frequency radar wave absorbing grass pattern containing a microstructure absorber. The surface of the radar wave absorbing integrated coating is printed with a multi-spectral camouflage coating that camouflages the visible light, near-infrared, and thermal infrared frequency bands. The six-layer composite fabric is prepared into a low RCS multi-spectral camouflage net through cutting, pulling, and binding processes. The radar wave absorbing integrated coating is located on the outside of the camouflage net, and the low-frequency radar wave absorbing grass pattern is located on the inside of the cut and arched part of the camouflage net.

[0008] As a preferred technical solution, the radar wave absorbing integrated coating is a polyurethane coating with a resistance of 200-2000Ω and containing a silicon carbide absorber.

[0009] As a preferred technical solution, the low-frequency radar absorbing grass pattern is a polyurethane coating with a resistance of 1 to 10 Ω and containing a microstructure absorber, printed into a grass pattern with a pattern height of 10 to 50 mm and a bottom width of 2 to 10 mm.

[0010] As a preferred technical solution, the carbon-silicon absorbent is one or a combination of two of the following: activated carbon powder with a particle size of 1-50 μm and spiral carbon / silicon carbide composite fiber powder.

[0011] As a preferred technical solution, the microstructure absorbent is one or a combination of several of the following: helical carbon fibers with a length of 0.1 to 1 mm, graphene with a sheet diameter of 5 to 10 μm, and activated carbon powder with a particle size of 0.05 to 0.1 mm.

[0012] Compared with the prior art, the beneficial effects of the present invention are: This invention discloses a low-RCS multi-spectral camouflage net. A radar-wave-penetrating integrated coating is located on the outer side of the camouflage net, while a low-frequency radar-absorbing grass pattern is located on the inner side of the arched floral section of the camouflage net, forming a dense, three-dimensional low-frequency radar-absorbing grass array. Porous activated carbon powder, spiral carbon / silicon carbide composite fiber powder, spiral carbon fiber, and other irregularly shaped absorbers form a micro-absorbing array. The radar-wave-penetrating integrated coating, the low-frequency radar-absorbing grass array, and the absorbers work synergistically to absorb radar waves, forming a macroscopic three-dimensional double-absorbing layer and a microscopically synergistic dense absorbing structure. This achieves a gradient impedance and high-efficiency absorption structure for the camouflage net. Radar waves enter the camouflage net and undergo multiple absorptions within the net without scattering outwards, thereby enhancing radar wave absorption performance, broadening the radar wave absorption frequency band, and reducing the target radar wave scattering cross section (RCS). This allows the camouflage net to be compatible with low RCS and high-efficiency absorption in a wide frequency range of 1–40 GHz, and it is also compatible with multi-spectral camouflage coatings, increasing the camouflage and stealth performance of the camouflage net. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the low RCS multi-spectral camouflage net of the present invention; Figure 2 This is a schematic diagram of the low-frequency radar absorbing grass pattern layer cut flower structure of the present invention; In the diagram: base fabric layer 11; first flame-retardant and waterproof layer 21; second flame-retardant and waterproof layer 31; radar wave absorbing integrated coating 41; low-frequency radar wave absorbing grass pattern 51; multi-spectral camouflage coating 61; Disguised netting for cutting flowers 601. Detailed Implementation

[0014] 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 only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] Please see Figure 1-2 Example

[0016] A low RCS multi-spectral camouflage net is provided, comprising a base fabric layer 11; a first flame-retardant and waterproof layer 21; a second flame-retardant and waterproof layer 31; a radar wave absorbing integrated coating 41; a low-frequency radar wave absorbing grass pattern 51; and a multi-spectral camouflage coating 61.

[0017] The base fabric layer 11 is coated with a first flame-retardant and waterproof layer 21 and a second flame-retardant and waterproof layer 31 on both sides. The surface of the first flame-retardant and waterproof layer 21 is coated with a lightweight radar wave absorbing integrated coating 41 containing a carbon silicon absorber. The surface of the second flame-retardant and waterproof layer 31 is printed with a lightweight low-frequency radar wave absorbing grass pattern 51 containing a microstructure absorber. The surface of the radar wave absorbing integrated coating 41 is printed with a multi-spectral camouflage coating 61 with visible light, near-infrared and thermal infrared frequency band camouflage. The six-layer composite fabric is prepared into a low RCS multi-spectral camouflage net through cutting, pulling and binding processes.

[0018] The radar wave absorption coating 41 is a polyurethane coating containing activated carbon powder with a particle size of 1μm and spiral carbon / silicon carbide composite fiber powder with a particle size of 50μm, and the coating resistance is 200Ω. The low-frequency radar absorbing grass pattern 51 is a polyurethane coating containing a combination of 0.1mm long spiral carbon fiber, 10μm diameter graphene, and 0.1mm diameter activated carbon powder, printed into a grass pattern with a height of 10mm, a bottom width of 2mm, and a coating resistance of 10Ω.

[0019] This low-RCS multi-spectral camouflage net has an average radar reflectivity of -8.2 dB in the L-band, -12.3 dB in the S-band, -15.6 dB in the C-band, -18.2 dB in the X-band, -20.7 dB in the Ku-band, and -22.4 dB in the Ka-band. When this low-RCS multi-spectral camouflage net covers a target, within the elevation angle range of -90° to 90°, the average RCS of the C-band decreases from 10 dBsm to -13.4 dBsm, and the average RCS of the X-band decreases from 5 dBsm to -17.5 dBsm. Example

[0020] A low RCS multi-spectral camouflage net is provided, comprising a base fabric layer 11; a first flame-retardant and waterproof layer 21; a second flame-retardant and waterproof layer 31; a radar wave absorbing integrated coating 41; a low-frequency radar wave absorbing grass pattern 51; and a multi-spectral camouflage coating 61.

[0021] The base fabric layer 11 is coated with a first flame-retardant and waterproof layer 21 and a second flame-retardant and waterproof layer 31 on both sides. The surface of the first flame-retardant and waterproof layer 21 is coated with a lightweight radar wave absorbing integrated coating 41 containing a carbon silicon absorber. The surface of the second flame-retardant and waterproof layer 31 is printed with a lightweight low-frequency radar wave absorbing grass pattern 51 containing a microstructure absorber. The surface of the radar wave absorbing integrated coating 41 is printed with a multi-spectral camouflage coating 61 with visible light, near-infrared and thermal infrared frequency band camouflage. The six-layer composite fabric is prepared into a low RCS multi-spectral camouflage net through cutting, pulling and binding processes.

[0022] The radar wave absorption coating 41 is a polyurethane coating containing a combination of 50μm activated carbon powder and 1μm spiral carbon / silicon carbide composite fiber powder, with a coating resistance of 2000Ω. The low-frequency radar absorbing grass pattern 51 is a polyurethane coating containing a combination of 1mm long spiral carbon fiber, 5μm diameter graphene, and 0.05mm diameter activated carbon powder, printed into a grass pattern with a height of 50mm, a bottom width of 10mm, and a coating resistance of 1Ω.

[0023] This low-RCS multi-spectral camouflage net has an average radar reflectivity of -9.6 dB in the L-band, -13.1 dB in the S-band, -16.8 dB in the C-band, -17.2 dB in the X-band, -19.3 dB in the Ku-band, and -20.8 dB in the Ka-band. When this low-RCS multi-spectral camouflage net covers a target, within the elevation angle range of -90° to 90°, the average RCS of the C-band decreases from 10 dBsm to -14.1 dBsm, and the average RCS of the X-band decreases from 5 dBsm to -16.8 dBsm. Example

[0024] A low RCS multi-spectral camouflage net is provided, comprising a base fabric layer 11; a first flame-retardant and waterproof layer 21; a second flame-retardant and waterproof layer 31; a radar wave absorbing integrated coating 41; a low-frequency radar wave absorbing grass pattern 51; and a multi-spectral camouflage coating 61.

[0025] The base fabric layer 11 is coated with a first flame-retardant and waterproof layer 21 and a second flame-retardant and waterproof layer 31 on both sides. The surface of the first flame-retardant and waterproof layer 21 is coated with a lightweight radar wave absorbing integrated coating 41 containing a carbon silicon absorber. The surface of the second flame-retardant and waterproof layer 31 is printed with a lightweight low-frequency radar wave absorbing grass pattern 51 containing a microstructure absorber. The surface of the radar wave absorbing integrated coating 41 is printed with a multi-spectral camouflage coating 61 with visible light, near-infrared and thermal infrared frequency band camouflage. The six-layer composite fabric is prepared into a low RCS multi-spectral camouflage net through cutting, pulling and binding processes.

[0026] The radar wave absorbing integrated coating 41 is a polyurethane coating containing spiral carbon / silicon carbide composite fiber powder with a particle size of 25μm, and the coating resistance is 1000Ω. The low-frequency radar absorbing grass pattern 51 is a polyurethane coating containing a combination of 0.5mm long spiral carbon fiber and 8μm diameter graphene, printed into a grass pattern. The pattern height is 30mm, the bottom width is 6mm, and the coating resistance is 3Ω.

[0027] This low-RCS multi-spectral camouflage net has an average radar reflectivity of -8.9 dB in the L-band, -12.7 dB in the S-band, -16.2 dB in the C-band, -18.6 dB in the X-band, -21.3 dB in the Ku-band, and -22.5 dB in the Ka-band. When this low-RCS multi-spectral camouflage net covers a target, within the elevation angle range of -90° to 90°, the average RCS of the C-band decreases from 10 dBsm to -13.8 dBsm, and the average RCS of the X-band decreases from 5 dBsm to -18.4 dBsm.

[0028] In summary, by setting up a base fabric layer 11 with a first flame-retardant and waterproof layer 21 and a second flame-retardant and waterproof layer 31 coated on both sides, the surface of the first flame-retardant and waterproof layer 21 is coated with a lightweight radar wave absorbing integrated coating 41 containing a carbon silicon absorber, the surface of the second flame-retardant and waterproof layer 31 is printed with a lightweight low-frequency radar wave absorbing grass pattern 51 containing a microstructure absorber, and the surface of the radar wave absorbing integrated coating 41 is printed with a multi-spectral camouflage coating 61 with visible light, near-infrared and thermal infrared frequency band camouflage; the six-layer composite fabric is prepared into a low RCS multi-spectral camouflage net through cutting, pulling and binding processes. The radar-wave penetrating integrated coating is located on the outside of the camouflage net, while the low-frequency radar-absorbing grass pattern is located on the inside of the arched floral pattern of the camouflage net, forming a dense three-dimensional low-frequency radar-absorbing grass array. Porous activated carbon powder, spiral carbon / silicon carbide composite fiber powder, spiral carbon fiber, and other irregularly shaped absorbers form a micro-absorbing array. The radar-wave penetrating integrated coating, the low-frequency radar-absorbing grass array, and the absorbers work together microscopically to absorb waves, forming a macroscopic three-dimensional double-absorbing layer and a microscopically synergistic dense absorbing structure. This achieves a gradient impedance and high-efficiency absorbing structure for the camouflage net. Radar waves enter the camouflage net and are absorbed multiple times inside without scattering outwards, thereby enhancing radar wave absorption performance, broadening the radar wave absorption frequency band, and reducing the target radar wave cross section (RCS). This makes the camouflage net compatible with low RCS and high-efficiency absorption in a wide frequency range of 1–40 GHz, and it is also compatible with multi-spectral camouflage coatings, increasing the camouflage and stealth performance of the camouflage net.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low RCS multi-spectral camouflage net, characterized in that, include: Base fabric layer (11); First flame-retardant and waterproof layer (21); Second flame-retardant and waterproof layer (31); A radar wave absorbing integrated coating (41) is located on the surface of the first flame-retardant and waterproof layer (21); Low-frequency radar-absorbing grass pattern (51) is located on the surface of the second flame-retardant and waterproof layer (31); A multi-spectral camouflage coating (61) is located on the surface of a radar wave penetrating integrated coating (41); The base fabric layer (11) is coated with a first flame-retardant and waterproof layer (21) and a second flame-retardant and waterproof layer (31) on both sides respectively; the surface of the first flame-retardant and waterproof layer (21) is coated with a lightweight radar wave absorbing integrated coating (41) containing a carbon silicon absorber; the surface of the second flame-retardant and waterproof layer (31) is printed with a lightweight low-frequency radar wave absorbing grass pattern (51) containing a microstructure absorber; the surface of the radar wave absorbing integrated coating (41) is printed with a multi-spectral camouflage coating (61) with visible light, near-infrared and thermal infrared frequency band camouflage; the six-layer composite fabric is prepared into a low RCS multi-spectral camouflage net through cutting, pulling and binding processes, the radar wave absorbing integrated coating (41) is located on the outside of the camouflage net, and the low-frequency radar wave absorbing grass pattern (51) is located on the inside of the arched part of the camouflage net cutting (601); The radar wave absorbing integrated coating (41) is a polyurethane coating with a resistance of 200 to 2000 Ω and containing a silicon carbide absorber. The low-frequency radar absorbing grass pattern (51) is a polyurethane coating with a resistance of 1 to 10 Ω and containing a microstructure absorber, printed into a grass pattern with a height of 10 to 50 mm and a bottom width of 2 to 10 mm. This enables the camouflage net to be compatible with low RCS and wideband high-efficiency wave absorption in a wide frequency range of 1-40GHz.

2. The low RCS multi-spectral camouflage network according to claim 1, characterized in that, The carbon-silicon absorbent is one or a combination of two of the following: activated carbon powder, spiral carbon, and silicon carbide composite fiber powder with a particle size of 1–50 μm.

3. The low RCS multi-spectral camouflage network according to claim 1, characterized in that, The microstructure absorbent is one or a combination of several of the following: helical carbon fibers with a length of 0.1 to 1 mm, graphene with a sheet diameter of 5 to 10 μm, and activated carbon powder with a particle size of 0.05 to 0.1 mm.

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