Individual-soldier protection umbrella with radar-infrared-visible light stealth function for defending small bombs of unmanned aerial vehicle and preparation method of individual-soldier protection umbrella

Abstract

The invention relates to the technical field of individual soldier protection equipment, in particular to an individual soldier protection umbrella with a radar-infrared-visible light stealth function for defending small bombs of an unmanned aerial vehicle and a preparation method of the individual soldier protection umbrella. The individual soldier protection umbrella comprises an umbrella handle, umbrella ribs, an umbrella cover, umbrella buckles and an umbrella disc, and the umbrella handle is connected with the umbrella ribs through the umbrella disc; the umbrella ribs and the umbrella cover are connected through umbrella buckles and local sewing, and the umbrella cover is in an opened or closed state by pushing and pulling the umbrella disc; the umbrella cover is composed of a plurality of flexible layers. The flexible layer sequentially comprises an outer skin flexible layer, a core material flexible layer and an inner skin flexible layer from outside to inside. According to the umbrella cover of the individual soldier protection umbrella, by means of the shear thickening liquid soaked in the core material flexible layer, the nano-particle network structure in the core material flexible layer rapidly gathers at an extremely high strain rate at the moment when the core material flexible layer is subjected to high-speed impact of bullets or fragments, so that the viscosity of the fluid is instantaneously increased, and the stability of the single soldier protection umbrella is improved. Therefore, the original soft core material layer is quickly converted into a local solid-like state in the hit area.

Description

Technical Field

[0001] This invention relates to the field of individual soldier protective equipment technology, specifically to an individual soldier protective umbrella with radar-infrared-visible light stealth capabilities for defending against small drone bombs and its manufacturing method. Background Technology

[0002] As the environments for urban warfare, counter-terrorism and stability maintenance, perimeter security of key targets, and special operations become increasingly complex, individual soldiers face a wider variety of threats, including munitions dropped by lightweight drones, fragmentation grenades, lightweight ammunition, and tracking by infrared and radar detection equipment. Traditional individual protective gear, such as body armor and bulletproof shields, while providing some protection, is often heavy, inconvenient to carry, has limited functionality, and lacks all-weather, multi-scenario applicability.

[0003] Currently, most protective umbrella products on the market focus on stab protection, slash protection, or basic bulletproof functions. They are mostly made of metal or hard composite materials, are heavy, inconvenient to store, and lack comprehensive protection against multiple threats such as shrapnel, infrared stealth, radar stealth, and visible light stealth. Furthermore, existing protective structures are prone to overall deformation or partial penetration after being hit by bullets, have poor resistance to repeated impacts, and rarely combine visual camouflage with infrared and radar stealth capabilities, failing to meet the needs of modern individual soldier concealment and protection.

[0004] Therefore, there is an urgent need to develop a lightweight, quick-opening and closing individual protective equipment that integrates bulletproof, fragmentation-proof, radar stealth, infrared stealth, visual camouflage, and daily sun and rain protection functions to improve personnel's survivability and mission flexibility in complex environments. Summary of the Invention

[0005] This invention provides a personal protective umbrella and its manufacturing method for defending against small drone bombs, which combines radar, infrared, and visible light stealth capabilities. It aims to solve the problems of existing protective equipment, such as large weight, limited functionality, lack of stealth and visual camouflage capabilities, and insufficient resistance to fragmentation impact. This protective umbrella has advantages such as being lightweight, flexible in opening and closing, high protective performance, and adaptability to multiple scenarios.

[0006] This invention is achieved through the following technical solution: a personal protective umbrella for defending against small drone bombs with radar-infrared-visible light stealth capabilities, comprising a handle, ribs, canopy, buckle, and disc. The handle is connected to the ribs via the disc, and the ribs are connected to the canopy via the buckle and partial sewing. The canopy is opened or closed by pushing or pulling the disc. The canopy is composed of multiple flexible layers. The flexible layers, from the outside to the inside, include an outer skin flexible layer, a core material flexible layer, and an inner skin flexible layer. The core material flexible layer is impregnated with a shear thickening liquid. The outer skin flexible layer, core material flexible layer, and inner skin flexible layer are all connected by Z-direction puncture, partial sewing, and edge restraint.

[0007] As a further improvement to the technical solution of the present invention, the outer skin flexible layer and the inner skin flexible layer are made of polyester or nylon fiber fabric, and the core material flexible layer is made of one or any combination of aramid fiber fabric, ultra-high molecular weight polyethylene fiber fabric, poly(p-phenylene benzodioxazole) fiber fabric, carbon fiber fabric, and quartz fiber fabric.

[0008] As a further improvement to the technical solution of the present invention, the shear thickening liquid uses polyvinyl alcohol as the matrix and gaseous nano-SiO2 particles and lightweight radar wave absorbing particles as fillers, wherein the mass fraction of SiO2 particles in the shear thickening liquid is 2%~35%, and the mass fraction of the shear thickening liquid in the core flexible layer is 0.3%~4%.

[0009] As a further improvement to the technical solution of the present invention, the outer surface of the outer skin flexible layer is made of camouflage fabric or coated with camouflage paint.

[0010] As a further improvement to the technical solution of the present invention, the umbrella handle is a telescopic structure and the umbrella ribs are a foldable structure. In the use state, the umbrella handle is in an extended state and the umbrella ribs are in an unfolded state. Both the umbrella handle and the umbrella ribs are made of one or any combination of fiber-reinforced resin matrix composite materials, aluminum alloys, titanium alloys or steel materials.

[0011] As a further improvement to the technical solution of the present invention, the total mass of the individual protective umbrella is ≤3.5 kg, and the equivalent areal density is ≤2.4 kg / m³. 2 The canopy diameter is 80~160 cm, and the canopy thickness is ≤3 mm; it provides protection against 7.62 mm lead-core bullets. 50 ≥400 m / s; infrared emissivity ≤0.3 in the wavelength ranges of 3~5 μm and 8~14 μm; radar stealth capability in the Ku and X bands; and visible light stealth capability in the visible light band.

[0012] A method for preparing a man-portable protective umbrella for defending against small drone bombs, as described above, which combines radar, infrared, and visible light stealth capabilities, includes the following steps: a) The umbrella handle and ribs are prepared separately using molding, casting, or winding processes, and then connected by an umbrella disc; b) According to the umbrella rib configuration, cut the outer skin flexible layer, core material flexible layer and inner skin flexible layer fabric to the size of the umbrella surface in sequence; c) The cut core material flexible layer fabric is immersed in a pre-prepared shear thickening liquid, then rolled and the liquid amount is controlled by the rollers. Then it is dried at 60~120℃ to obtain the core material flexible layer. d) Lay out the cut outer flexible skin layer, core flexible layer, and inner flexible skin layer in sequence to obtain the umbrella canopy. Then, use a Z-axis piercing process for pre-positioning to determine the relative position of the umbrella ribs and the canopy. The density of the piercing yarn is 10~30 stitches / m. 2 ; e) Sew along the outline edge of the umbrella surface, and use umbrella buckles to fix the final position of the umbrella rib edge and the umbrella surface to obtain the individual protective umbrella.

[0013] The present invention provides a man-portable protective umbrella and manufacturing method for small anti-drone bombs with radar, infrared, and visible light stealth capabilities, which has the following advantages compared with the prior art: 1) The total mass of the individual protective umbrella of this invention is ≤3.5kg, and the equivalent areal density is ≤2.4 kg / m³. 2 ; 2) The individual protective umbrella of this invention has a canopy diameter of 80~160cm and a canopy thickness of ≤3mm, and can be used for impact protection against bullets, explosive fragments, etc., and provides protection against 7.62mm lead-core bullets. 50 ≥400m / s; 3) The individual protective umbrella of the present invention has an infrared emissivity of ≤0.3 in the wavelength ranges of 3~5μm and 8~14μm, has radar stealth performance in the Ku band and X band, and visible light stealth performance in the visible light band.

[0014] 4) The overall structure of the individual protective umbrella of this invention is made of one or a combination of fiber-reinforced composite materials, aluminum alloys, titanium alloys, or steel for both the handle and ribs. Therefore, it provides excellent specific strength and specific modulus, thus ensuring sufficient structural rigidity and shape stability after the canopy is deployed while achieving overall lightweight design. Simultaneously, this high-rigidity frame system prevents large-area, uncontrolled dents or wrinkles in the canopy when subjected to bullet or shrapnel impacts, ensuring that the impact load is effectively distributed to the entire canopy and handle through the ribs, avoiding excessive stress concentration.

[0015] 5) The canopy of the individual protective parachute of the present invention, thanks to the shear-thickening fluid (STF) impregnated in the flexible core layer, experiences a rapid aggregation of its internal nanoparticle network structure under extremely high strain rates upon high-speed impact from a bullet or fragment. This causes a sudden surge in fluid viscosity, rapidly transforming the originally soft core layer into a localized solid-like state at the impact site. This intelligent response, from "soft" to "rigid," works synergistically with the high-strength fiber fabric to not only effectively suppress the intrusion of projectiles or fragments but also efficiently dissipate impact energy through internal friction, fiber tensile fracture, and the shear-thickening effect itself. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0017] 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, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the individual protective umbrella of the present invention. In the diagram, 1-umbrella handle, 2-umbrella ribs, 3-umbrella canopy, 4-umbrella buckle, and 5-umbrella disc.

[0019] Figure 2 This is a schematic diagram illustrating the manufacturing method of the individual protective parachute handle according to the present invention. In the diagram, 6 represents the handle mold, 7 represents carbon fiber tow, and 8 represents a CNC fiber winding machine.

[0020] Figure 3 This is a partial sewing diagram of the umbrella canopy and ribs according to the present invention.

[0021] Figure 4 This is a photograph of the actual individual protective umbrella of the present invention. Detailed Implementation

[0022] To better understand the above-mentioned objectives, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the invention, but the invention may also be practiced in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the invention, and not all embodiments.

[0024] This invention provides a specific implementation of a personal protective umbrella for defending against small drone bombs, which combines radar, infrared, and visible light stealth capabilities. It includes a handle 1, ribs 2, canopy 3, buckle 4, and disc 5. The handle 1 is connected to the ribs 2 via the disc 5, and the ribs 2 are connected to the canopy 3 via the buckle 4 and partial sewing. Pushing or pulling the disc 5 allows the canopy 3 to be in an open or closed state. The canopy 3 is composed of multiple flexible layers. From the outside to the inside, the flexible layers include an outer skin flexible layer, a core material flexible layer, and an inner skin flexible layer. The core material flexible layer is impregnated with a shear-thickening liquid. The outer skin flexible layer, core material flexible layer, and inner skin flexible layer are all connected using Z-axis puncture, partial sewing, and edge restraint.

[0025] In one example provided by the present invention, the outer skin flexible layer and the inner skin flexible layer are made of polyester or nylon fiber fabric, and the core flexible layer is made of one or any combination of aramid fiber fabric, ultra-high molecular weight polyethylene fiber fabric, poly(p-phenylene benzodioxazole) fiber fabric, carbon fiber fabric, and quartz fiber fabric.

[0026] In another example provided by the present invention, the shear thickening liquid uses polyvinyl alcohol as the matrix and gaseous nano-SiO2 particles and lightweight radar wave absorbing particles as fillers, wherein the mass fraction of SiO2 particles in the shear thickening liquid is 2%~35% and the mass fraction of the shear thickening liquid in the core flexible layer is 0.3%~4%.

[0027] In one example provided by the present invention, the outer surface of the outer skin flexible layer is made of camouflage fabric or coated with camouflage paint.

[0028] In another example provided by the present invention, the umbrella handle 1 is a telescopic structure and the umbrella rib 2 is a foldable structure. In the use state, the umbrella handle 1 is in an extended state and the umbrella rib 2 is in an unfolded state. Both the umbrella handle 1 and the umbrella rib 2 are made of one or any combination of fiber-reinforced resin matrix composite material, aluminum alloy, titanium alloy or steel material.

[0029] In one example provided by this invention, the total mass of the individual protective umbrella is ≤3.5 kg, and the equivalent areal density is ≤2.4 kg / m³. 2 The diameter of canopy 3 is 80~160 cm, and the thickness of canopy 3 is ≤3 mm; protection against 7.62 mm lead-core bullets. 50 ≥400 m / s; infrared emissivity ≤0.3 in the wavelength ranges of 3~5 μm and 8~14 μm; radar stealth capability in the Ku and X bands; and visible light stealth capability in the visible light band.

[0030] This invention further provides a method for preparing a man-portable protective umbrella for defending against small drone bombs, which combines radar, infrared, and visible light stealth capabilities as described above, comprising the following steps: a) The umbrella handle 1 and umbrella rib 2 are prepared by molding, casting or winding processes respectively, and then the two are connected by the umbrella plate 5; b). According to the configuration of the umbrella ribs 2, cut the outer skin flexible layer, core material flexible layer and inner skin flexible layer fabrics to the size of the umbrella surface 3 in sequence; c) The cut core material flexible layer fabric is immersed in a pre-prepared shear thickening liquid, then rolled and the liquid amount is controlled by the rollers. Then it is dried at 60~120℃ to obtain the core material flexible layer. d) Lay out the cut outer flexible skin layer, the core flexible layer, and the cut inner flexible skin layer in sequence to obtain the umbrella surface 3. Then, use a Z-axis piercing process for pre-positioning to determine the relative position of the umbrella ribs 2 and the umbrella surface 3. The density of the piercing yarn is 10~30 stitches / m. 2 ; e) Sew along the outline edge of the umbrella surface 3, and use umbrella buckles 4 to fix the edge of the umbrella ribs 2 and the final position of the umbrella surface 3 to obtain the individual protective umbrella.

[0031] The specific embodiments of the present invention will be described in detail below.

[0032] like Figure 1 As shown, the canopy 3 of the individual protective umbrella includes, from the outside to the inside, an outer flexible skin layer, a core flexible layer impregnated with a shear thickening liquid, and an inner flexible skin layer. Each flexible layer is laid out in sequence, pre-positioned by Z-direction puncture, and finally connected and fixed by the partial sewing of the umbrella ribs 2 and the canopy 3 and the edge constraints of each flexible layer, forming a complete, flexible, multi-functional composite protective umbrella canopy. Example 1

[0033] A personal protective umbrella for defending against small drone bombs, featuring radar, infrared, and visible light stealth capabilities, employs an eight-rib structure. The canopy 3 unfolds into a perfect circle. The handle 1 and the canopy disc 5 are made of carbon fiber reinforced epoxy resin composite material, and the ribs 2 are machined from 7075-T6 aluminum alloy tubing. The manufacturing process includes the following steps: a) Umbrella handle and umbrella disc manufacturing The umbrella handle 1 is shaped through fiber winding and layup. A cylindrical aluminum alloy is used as the mandrel 6 for the handle 1, and it is clamped on a CNC fiber winding machine 8. T700 carbon fiber tow 7 prepreg is used for fiber winding. Figure 2 A schematic diagram of the manufacturing method of the individual protective umbrella handle of the present invention is shown. The winding process is as follows: the winding path is controlled by CNC programming. First, the carbon fiber tow 7 prepreg is spirally wound at ±45°, completing one full turn along the surface of the mandrel 6. Then, the carbon fiber tow 7 prepreg is circumferentially wound at 90°, also completing one turn. The winding tension is 30 N to ensure straight fibers, uniform resin content, and to eliminate interlayer air bubbles. After winding is completed, the umbrella handle preform is obtained.

[0034] The umbrella tray 5 is shaped and laid out manually. An aluminum alloy mold is used to create the tray mold, and T700 carbon fiber unidirectional prepreg (epoxy resin system, resin content 33±3%) is selected to prepare the tray 5. The prepreg is cut according to the mold dimensions and then laid layer by layer inside the mold, with the laying angle sequence being (0°, 90°, ±45°). 3s Once the tiling is complete, the umbrella-shaped prefabricated structure will be obtained.

[0035] After vacuum-sealing the obtained umbrella handle preforms and umbrella disc preforms, they were cured and molded using an autoclave process. The specific process steps are as follows: First, a release film, a breathable felt, and an absorbent felt are sequentially laid on the outer surface of the umbrella handle preforms and umbrella disc preforms. The entire structure is then covered with a vacuum bag film and sealed with sealing strips to form a closed system. After connecting the vacuum pipeline, a vacuum is drawn to -0.09 MPa for pre-compaction, ensuring tight adhesion of the fiber layers and removal of residual gas. Subsequently, the structures are transferred to an autoclave, and a segmented curing procedure is performed according to the curing characteristics of the epoxy resin system: In the first stage, the temperature is increased to 100 ℃ at a rate of 1~2 ℃ / min and held at this temperature for 60 min to achieve initial gelation of the resin; in the second stage, a curing pressure of 0.7 MPa is applied while maintaining the temperature increase, and the temperature is further increased to the peak curing temperature of 140 ℃; in the third stage, the structure is held at 140 ℃ and 0.7 MPa for 60 min; after cooling to room temperature, the vacuum sealing system and the mandrel are removed to obtain carbon fiber composite umbrella handle and umbrella disc blanks. Finally, post-processing is performed, including edge trimming, end face machining, and surface polishing, to obtain the carbon fiber composite umbrella handle 1 and umbrella disc 5 that meet the requirements. The umbrella handle 1 and umbrella disc 5 are then assembled, as follows: Figure 1 As shown.

[0036] b) Umbrella Rib Making The umbrella rib 2 is made of 7075-T6 aluminum alloy tubing, which is formed to the required curvature by a CNC tube bending machine. The end of the umbrella rib 2 (the end that connects to the umbrella canopy 3) is precision CNC turned and milled to produce a wedge-shaped head that precisely matches the internal groove of the umbrella buckle.

[0037] c) Umbrella fabrication In this embodiment, the flexible core layer has an areal density of 200 g / m². 2 The fabric is made of aramid 1414 plain weave fabric and T700 carbon fiber 3k plain weave fabric. The inner and outer skin flexible layers are made of 420D nylon Oxford cloth, and the outer surface of the outer skin is printed with a jungle camouflage pattern.

[0038] 20% by mass of fumed nano-SiO2 and 0.5% by mass of modified reduced graphene oxide were dispersed in a 5% aqueous solution of polyvinyl alcohol. After high-speed stirring and ultrasonic treatment, a uniform and stable STF dispersion was prepared. Aramid fabric was thoroughly impregnated in a padding tank, with the liquid content controlled to 75% using rollers. It was then dried at 100°C for 15 minutes to fix the STF into the fiber gaps. After this treatment, the mass fraction of STF in the flexible core layer was approximately 1.5%.

[0039] Cut the inner and outer skins, aramid fabric, and carbon fiber woven fabric into fan shapes. The layering order from bottom to top is: inner skin, 2 layers of carbon fiber woven fabric, 3 layers of aramid fabric, and outer skin. Use a low-tack, removable positioning film to initially position the umbrella layer and ribs 2, ensuring no slippage or wrinkles during sewing. Lay the layer flat on the sewing machine's work platform, using high-strength polyester multifilament (1000D) as the threading yarn at 20 stitches / m. 2 The density is used to perform edge Z-direction puncture, so that the 7 layers of fabric are initially composited and positioned with the umbrella ribs.

[0040] Based on the pre-positioned Z-axis puncture, localized sewing reinforcement is performed. Specifically, a strip of approximately 5 cm wide is added below the planned connection path of each umbrella rib, with a stitch aligned with the direction of the rib. This stitch penetrates all layers, forming an anchoring sewing area between the rib and the canopy. High-strength nylon buckle loops are then sewn at equal intervals, with plastic umbrella buckles embedded within the loops. Figure 3 This is a partial sewing diagram of the umbrella canopy 3 and the umbrella rib 2, showing the main sewing anchoring area.

[0041] d) Overall assembly A uniform groove is precisely machined around the umbrella disc 5 and fitted with a small bearing, along with a spring locking function. Matching sliders and locking recesses are formed at the base of the umbrella ribs 2, hinged to the umbrella disc 5 via stainless steel pins, forming the "umbrella disc" mechanism. This allows the umbrella ribs 2 to smoothly unfold and automatically lock, establishing a stable and efficient force transmission structure between the canopy 3 and the ribs. Finally, the ribs and buckles are fitted together to complete the final assembly, resulting in a single-soldier protective umbrella with radar, infrared, and visible light stealth capabilities, designed to defend against small drone bombs. Figure 4 The photo shown is of the actual product.

[0042] The individual protective umbrella manufactured in this embodiment was subjected to ballistic gun testing. The test ammunition was a Type 51 7.62 mm lead-core bullet, which withstood two full-charge bullets fired at a distance of 100 m, with a firing velocity of 400 ± 20 m / s. Table 1 shows the ballistic gun test results of the individual protective umbrella prepared in Example 1.

[0043] Table 1. Ballistic test results of individual protective parachutes

[0044] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the present invention. Although detailed descriptions have been provided 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 or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments, and they should all be covered within the protection scope of the claims.

Claims

1. A personal protective umbrella for defending against small drone bombs, featuring radar-infrared-visible light stealth capabilities, characterized in that: The umbrella includes a handle (1), ribs (2), canopy (3), buckle (4), and disc (5). The handle (1) is connected to the ribs (2) via the disc (5), and the ribs (2) are connected to the canopy (3) via the buckle (4) and partial sewing. The canopy (3) is opened or closed by pushing and pulling the disc (5). The canopy (3) is composed of multiple flexible layers. The flexible layers include an outer skin flexible layer, a core material flexible layer, and an inner skin flexible layer from the outside to the inside. The core material flexible layer is impregnated with a shear thickening liquid. The outer skin flexible layer, the core material flexible layer, and the inner skin flexible layer are all connected by Z-direction puncture, partial sewing, and edge restraint.

2. A personal protective umbrella for defending against small drone bombs with radar-infrared-visible light stealth capabilities as described in claim 1, characterized in that, The outer and inner flexible skin layers are made of polyester or nylon fiber fabrics, and the core flexible layer is made of one or any combination of aramid fiber fabrics, ultra-high molecular weight polyethylene fiber fabrics, poly(p-phenylene benzodioxazole) fiber fabrics, carbon fiber fabrics, and quartz fiber fabrics.

3. A personal protective umbrella for defending against small drone bombs with radar-infrared-visible light stealth capabilities as described in claim 1, characterized in that, The shear thickening fluid uses polyvinyl alcohol as the matrix and gaseous nano-SiO2 particles and lightweight radar wave absorbing particles as fillers. The mass fraction of SiO2 particles in the shear thickening fluid is 2% to 35%, and the mass fraction of the shear thickening fluid in the core flexible layer is 0.3% to 4%.

4. A personal protective umbrella for defending against small drone bombs with radar-infrared-visible light stealth capabilities as described in claim 1, characterized in that, The outer surface of the flexible outer skin layer is made of camouflage fabric or coated with camouflage paint.

5. A personal protective umbrella for defending against small drone bombs with radar-infrared-visible light stealth capabilities as described in claim 1, characterized in that, The umbrella handle (1) is a telescopic structure and the umbrella ribs (2) are foldable structures. When in use, the umbrella handle (1) is in an extended state and the umbrella ribs (2) are in an unfolded state. Both the umbrella handle (1) and the umbrella ribs (2) are made of one or any combination of fiber-reinforced resin matrix composite materials, aluminum alloys, titanium alloys or steel materials.

6. A personal protective umbrella for defending against small drone bombs with radar-infrared-visible light stealth capabilities as described in claim 1, characterized in that, The total mass of the individual protective umbrella is ≤3.5 kg, and the equivalent areal density is ≤2.4 kg / m³. 2 The diameter of the canopy (3) is 80~160 cm, and the thickness of the canopy (3) is ≤3 mm; protection against 7.62 mm lead-core bullets V 50 ≥400 m / s; infrared emissivity ≤0.3 in the wavelength ranges of 3~5 μm and 8~14 μm; radar stealth capability in the Ku and X bands; and visible light stealth capability in the visible light band.

7. A method for preparing a man-portable protective umbrella for defending against small drone bombs with radar-infrared-visible light stealth capabilities as described in claims 1-6, characterized in that, Includes the following steps: a). The umbrella handle (1) and umbrella ribs (2) are prepared by molding, casting or winding processes respectively, and then the two are connected by umbrella plate (5); b). According to the configuration of the umbrella ribs (2), cut the outer skin flexible layer, core material flexible layer and inner skin flexible layer fabric to the size of the umbrella surface (3) in sequence; c) The cut core material flexible layer fabric is immersed in a pre-prepared shear thickening liquid, then rolled and the liquid amount is controlled by the rollers. Then it is dried at 60~120℃ to obtain the core material flexible layer. d) Lay out the cut outer flexible skin layer, the core flexible layer, and the cut inner flexible skin layer in sequence to obtain the umbrella surface (3). Then, use the Z-direction piercing process for pre-positioning to determine the relative position of the umbrella ribs (2) and the umbrella surface (3). The density of the piercing yarn is 10~30 stitches / m. 2 ; e). Sew along the outline edge of the umbrella surface (3), and use umbrella buckles (4) to fix the final position of the edge of the umbrella ribs (2) and the umbrella surface (3) to obtain the individual protective umbrella.

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