Millimeter wave radar radome and preparation method thereof

Abstract

The invention relates to a millimeter wave radar radome and a preparation method, and belongs to the field of antennae, the radome comprises a first unit plate, a second unit plate, a third unit plate and a mounting base ring, and the four parts form a spherical structure; the first unit plate is located at the top of the spherical structure, the second unit plate and the third unit plate are located in the middle of the spherical structure, and the mounting base ring is located at the bottom of the spherical structure; a cabin door is arranged on the third unit plate; each of the first unit plate, the second unit plate and the third unit plate comprises an inner aramid fiber skin and an outer aramid fiber skin, an aramid fiber honeycomb is bonded between the inner aramid fiber skin and the outer aramid fiber skin, an outer paint layer is sprayed on the surface of the outer aramid fiber skin, and an inner paint layer is sprayed on the surface of the inner aramid fiber skin. The wave-transparent working area is made of a full aramid material, and compared with a traditional radome with a glass fiber reinforced plastic skin, the wave-transparent radome has the advantages that the wave-transparent rate is better, the adhesiveness of the radome plate is higher, and the strength of the radome body is higher.

Description

Technical Field

[0001] The present invention relates to the field of antennas, and in particular to a millimeter wave radar antenna cover and a preparation method thereof. Background Art

[0002] In the ground-based comprehensive meteorological observation system, the observation of ground-based clouds is an important observation object. The millimeter-wave cloud radar working in the Ka band uses the scattering effect of hydrometeors on electromagnetic waves to obtain parameter information of meteorological targets such as clouds, rain and fog, and realizes the observation of the macroscopic structure and microphysical parameters of meteorological echoes. Due to the adverse factors such as salt fog, dust and typhoons in the marine environment, the radar equipment needs to be installed with a radome for protection; because the traditional radome is spherical, there are many splicing panels and the splicing gaps are seriously blocked. In addition, the traditional radome is usually made of foam or fiberglass, which has adverse phenomena such as large dielectric constant when the electromagnetic waves in the millimeter wave band penetrate, absorption by materials and enhanced reflection of metal components, which directly affect the technical indicators of the millimeter-wave cloud radar system. Therefore, how to solve the problems of many splicing seams and large shielding losses in the football-shaped structural scheme of traditional meteorological radars, solve the problems of large insertion loss of traditional fiberglass antennas and other problems that affect the loss of millimeter-wave radomes, and solve the problem of deterioration of electromagnetic wave permeability of radomes caused by condensation of water droplets caused by temperature difference between the inside and outside of the radome, is currently needed to be considered. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a millimeter wave radar antenna cover and a preparation method thereof, thereby solving the deficiencies of the prior art.

[0004] The object of the present invention is achieved by the following technical scheme: a millimeter wave radar radome, the radome comprises a first unit plate, a second unit plate, a third unit plate and a mounting base ring, the four parts constitute a spherical structure; the first unit plate is located at the top of the spherical structure, the second unit plate and the third unit plate are located in the middle of the spherical structure, and the mounting base ring is located at the bottom of the spherical structure; a hatch is arranged on the third unit plate; The first unit panel, the second unit panel and the third unit panel all include an inner aramid fiber skin and an outer aramid fiber skin, an aramid fiber honeycomb is bonded between the inner aramid fiber skin and the outer aramid fiber skin, an outer paint layer is sprayed on the surface of the outer aramid fiber skin, and an inner paint layer is sprayed on the surface of the inner aramid fiber skin.

[0005] The antenna cover includes five second unit panels and one third unit panel. Six petal-shaped unit panels form a circle. One end of the second unit panel and the third unit panel is reinforced on the mounting base ring by fiberglass, and the first unit panel is fixed to the other end of the second unit panel and the third unit panel.

[0006] The first unit panel and the second unit panel constitute a radar wave-transmitting working area, and the third unit panel is a radar non-working area.

[0007] A method for preparing a millimeter wave radar radome, the method comprising: a working area single board preparation step, a non-working area preparation step and a paint layer spraying step; The steps of preparing the single board in the working area include: installing the aramid fiber honeycomb and fixing the edge strip, paving the outer aramid fiber skin, vacuumizing and pressurizing and curing at room temperature and curing at high temperature, vacuumizing and pressurizing and curing at room temperature and curing at high temperature after the aramid fiber honeycomb is installed, paving the inner aramid fiber skin and vacuumizing and pressurizing and curing at room temperature; The preparation steps of the non-working area include: installing aramid fiber honeycombs and fixing edge strips, paving and vacuum curing the outer aramid fiber skin at room temperature, vacuum curing and pressurizing the aramid fiber honeycombs at room temperature and curing them at high temperature, and pressurizing and curing the inner aramid fiber skin, paving and curing the moisture-proof edges.

[0008] The step of preparing the single plate in the working area includes installing the aramid fiber honeycomb and fixing the edge strips: A plurality of honeycomb blocks are arranged in a single-board mold in a working area, the area of ​​each honeycomb board is as large as possible, the joint gaps between the honeycomb boards are squeezed to make the joint gaps between the honeycombs as small as possible, and the honeycomb boards are marked to obtain aramid fiber honeycombs; In the wave-transmitting working area of ​​the single-board mold in the working area, and close to the seam edge of the single-board mold in the working area, a side retaining strip with a width of not less than 15 mm shall be installed.

[0009] The steps of preparing the single board in the working area include laying the outer aramid fiber skin, vacuuming and pressurizing to cure at room temperature, and curing at high temperature: An outer aramid fiber skin is laid on the surface of the single board mold in the working area. The outer aramid fiber skin includes aramid cloth and aramid fiber. The aramid fiber is laid on the outer surface of the aramid fiber honeycomb and is 20 mm away from the seam edge of the single board mold in the working area. The aramid cloth is laid on the aramid fiber and is 40 mm away from the seam edge of the single board mold in the working area. The aramid cloth and the aramid fiber are bonded by resin glue. Glue sealing strips on the edge of the single board mold in the working area, and lay peeling cloth, breathable felt and high-temperature resistant vacuum bag film on the surface of the aramid cloth. Use sealing strips to stick the vacuum bag film tightly to the single board mold in the working area, reserve a vacuum degree detection position in the vacuum bag film, and use a vacuum pump to evacuate and pressurize for curing; After being cured under pressure at room temperature, it is sent to an oven and heated to 60°C for heat curing and dehumidification.

[0010] In the working area single board preparation step, after the aramid fiber honeycomb is installed, vacuuming and pressurizing curing at room temperature and high temperature curing are performed, which includes: Clean the dust on the surface of the aramid fiber honeycomb and heat treat it at 80℃ for more than one hour. Apply resin glue on one side of the aramid fiber honeycomb and place the marked honeycomb panel on the inner surface of the outer aramid fiber skin. The aramid fiber honeycomb boundary should be 20mm away from the seam edge of the single board mold in the working area. The peeling cloth, breathable felt and high temperature resistant vacuum bag film are laid on the surface of the aramid fiber honeycomb and vacuumed and pressurized for curing. Then, a high temperature heat treatment of 80°C is performed for heat curing and dehumidification. After curing for 1 hour, the surface is taken out and restored to room temperature to eliminate stress.

[0011] The step of preparing the single board in the working area includes laying the inner aramid fiber skin and vacuuming and pressurizing and curing at room temperature: Apply resin glue on the surface of the aramid fiber honeycomb and lay the inner aramid fiber skin, the inner aramid fiber skin includes aramid cloth and aramid fiber, the aramid fiber is laid to the edge of the aramid fiber honeycomb and 20 mm away from the seam edge of the single board mold in the working area, the aramid cloth is laid to the edge of the aramid fiber honeycomb and 40 mm away from the seam edge of the single board mold in the working area, and the aramid cloth and the aramid fiber are bonded by resin glue; The peeling cloth, breathable felt and high temperature resistant vacuum bag film are laid on the surface of the aramid cloth and then vacuumed and pressurized for curing.

[0012] The step of installing the aramid fiber honeycomb and fixing the edge strip in the non-working area preparation step includes: A plurality of honeycombs are arranged in a single-board mold in a non-working area, the area of ​​each honeycomb board is as large as possible, the joint gaps between the honeycomb boards are squeezed to make the joint gaps between the honeycombs as small as possible, and the honeycomb boards are marked to obtain aramid fiber honeycombs; In the non-working area of ​​the non-working area single plate mold, a retaining strip is arranged close to the seam edge of the non-working area single plate mold; The steps of vacuumizing, pressurizing and curing the aramid fiber honeycomb at room temperature and curing it at high temperature in the non-working area preparation step and the working area single board preparation step are consistent with the steps of vacuumizing, pressurizing and curing the aramid fiber honeycomb (7) at room temperature and curing it at high temperature in the working area single board preparation step.

[0013] The non-working area preparation step includes laying the outer aramid fiber skin and vacuum curing at room temperature: Apply resin glue on the surface of the aramid fiber honeycomb and lay the outer aramid fiber skin, the outer aramid fiber skin includes three layers of glass fiber cloth, and the three layers of glass fiber cloth are laid on the single plate mold edge strip in the non-working area. During the laying process of the glass fiber cloth, overlap treatment is adopted, and the overlap width is 20mm; Lay peeling cloth, breathable felt and high temperature resistant vacuum bag film on the surface of glass fiber cloth and vacuum and pressurize to cure; The non-working area preparation step includes pressurizing and curing the inner aramid fiber skin, laying and curing the moisture-proof edge: Apply resin glue on the surface of the aramid fiber honeycomb and lay the inner aramid fiber skin, the inner aramid fiber skin includes three layers of glass fiber cloth, and the three layers of glass fiber cloth are laid on the single plate mold edge strip in the non-working area. The glass fiber cloth is overlapped during laying, and the overlap width is 20mm; Lay high-strength fiberglass cloth on the bottom of the mold in the non-working area, and lay glue-impregnated high-strength fiberglass cloth on the edge strips, with the number of layers being no less than 15; After demoulding is completed by pressurized curing, the joint between the bottom of the non-working area and the aramid fiber honeycomb is immediately treated with viscose polyvinyl chloride coated cloth to achieve moisture-proof edge paving; Fix the moisture-proof edge firmly with a clamp and use breathable felt to absorb excess resin. Place the antenna cover with moisture-proof edge in an oven with an isolation film and bake it. After baking is completed and the temperature returns to normal, it can be inspected.

[0014] The present invention has the following advantages: a millimeter-wave radar radome and a preparation method thereof, wherein the wave-transmitting working area is made of all-aramid material, which has better wave transmittance, stronger cover plate adhesion, and higher cover body strength compared with a traditional fiberglass-skinned radome; a hydrophobic paint with water-repellent properties is sprayed on the inner side of the radome working area, and a double-layer polyvinyl chloride coated cloth with excellent waterproof performance is laid on the bottom of the radome for covering and insulating treatment, thereby improving the moisture-proof performance of the radome and significantly reducing the risk of water droplets formed in the radome due to the temperature difference between the inside and outside of the radome causing humidity to form water droplets, which affects the transmission of millimeter-wave electromagnetic waves; a high-temperature curing process is adopted, which shortens the preparation time cycle compared with the traditional normal-temperature pressurized curing process, and has obvious advantages in batch preparation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 Schematic diagram of the composition structure of a single board; In the figure: 1-first unit panel, 2-second unit panel, 3-third unit panel, 4-hatch door, 5-mounting base ring, 6-inner aramid fiber skin, 7-aramid fiber honeycomb, 8-outer aramid fiber skin. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the present application provided below in conjunction with the drawings is not intended to limit the scope of protection of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application. The present invention is further described below in conjunction with the drawings.

[0017] One embodiment of the present invention relates to a Ka-band millimeter-wave radar radome. Compared with a traditional spherical radar radome, it has the characteristics of light weight, high appearance recognition, short preparation cycle, and low insertion loss of the same volume. The radome mainly solves the disadvantage that the insertion loss of traditional radomes cannot meet the application requirements when used in the millimeter-wave band with shorter wavelengths; specifically includes the following contents.

[0018] like Figure 1 As shown, the radome includes a first unit panel 1, a second unit panel 2, a third unit panel 3 and a mounting base ring 5, and the four parts form a spherical structure; the first unit panel 1 is located at the top of the spherical structure, the second unit panel 2 and the third unit panel 3 are located in the middle of the spherical structure, and the mounting base ring 5 is located at the bottom of the spherical structure; a hatch 4 is provided on the third unit panel 3; Furthermore, if Figure 2 As shown, the first unit panel 1, the second unit panel 2, and the third unit panel 3 all include an inner aramid fiber skin 6 and an outer aramid fiber skin 8, an aramid fiber honeycomb 7 is bonded between the inner aramid fiber skin 6 and the outer aramid fiber skin 8, an outer paint layer is sprayed on the surface of the outer aramid fiber skin 8, and an inner paint layer is sprayed on the surface of the inner aramid fiber skin 6.

[0019] Furthermore, the antenna cover includes five second unit panels 2 and one third unit panel 3, and the six petal-shaped unit panels form a circle. One end of the second unit panel 2 and the third unit panel 3 is reinforced on the mounting base ring 5 by fiberglass, and the first unit panel 1 is fixed to the other end of the second unit panel 2 and the third unit panel 3.

[0020] The first unit panel 1 and the second unit panel 2 form a radar wave-transmitting working area, and the third unit panel 3 is a radar non-working area.

[0021] Another embodiment of the present invention relates to a method for preparing a millimeter wave radar radome, which comprises: a working area single board preparation step, a non-working area preparation step and a paint layer spraying step; Further steps of preparing the work area single board include the following: Installing the aramid fiber honeycomb 7: placing a plurality of honeycombs in a single board mold in the working area, making the area of ​​each honeycomb board as large as possible, squeezing the joint gaps between the honeycomb boards to make the joint gaps between the honeycombs as small as possible, and marking the honeycomb boards to obtain the aramid fiber honeycomb 7.

[0022] Fixing of edge strips: In the wave-transmitting working area of ​​the single-board mold in the working area, and close to the seam edge of the single-board mold in the working area, an edge strip with a width of not less than 15 mm shall be installed.

[0023] Laying of outer aramid fiber skin 8: Laying of outer aramid fiber skin 8 on the surface of single board mold in working area, outer aramid fiber skin 8 comprises aramid cloth and aramid fiber, aramid fiber is laid on the outer surface of aramid fiber honeycomb 7 to 20 mm away from the seam edge of single board mold in working area, aramid cloth is laid on aramid fiber to 40 mm away from the seam edge of single board mold in working area, overlapping treatment is adopted in aramid fiber laying process, aramid cloth and aramid fiber are bonded by resin glue.

[0024] Vacuuming and pressurizing for curing at room temperature: Paste sealing strips on the edge of the single board mold in the working area, and lay peeling cloth, breathable felt and high-temperature resistant vacuum bag film on the surface of the aramid cloth. Stick the vacuum bag film tightly to the single board mold in the working area with a sealing strip, reserve a vacuum detection position in the vacuum bag film, and use a vacuum pump to vacuum and pressurize for curing; the vacuum degree is not less than 80Kpa, and the curing time at room temperature is 4h.

[0025] High temperature curing: After pressure curing at room temperature, send it into an oven and heat it to 60°C for heat curing and dehumidification; after curing for 1 hour, take it out and return it to room temperature to eliminate stress before proceeding to the next step.

[0026] Cleaning of aramid fiber honeycomb 7: clean the dust on the surface of aramid fiber honeycomb 7 and heat treat it at 80°C for more than one hour, apply resin glue on one side of aramid fiber honeycomb 7 and place the marked honeycomb panel on the inner surface of outer aramid fiber skin 8, and the boundary of aramid fiber honeycomb 7 is 20mm away from the seam edge of single board mold in the working area.

[0027] Aramid fiber honeycomb 7 pressurized curing: the surface of the aramid fiber honeycomb 7 is covered with peeling cloth, breathable felt and high temperature resistant vacuum bag film and vacuumed and pressurized for curing, the vacuum degree is not less than 80KPa, and the curing time is 4h at room temperature.

[0028] Aramid fiber honeycomb 7 high temperature curing: then carry out high temperature heat treatment at 80°C for heat curing and dehumidification, take out after curing for 1 hour, restore to room temperature to eliminate stress and then demould.

[0029] Inspection: After the outer aramid fiber skin 8 and the aramid fiber honeycomb 7 are cured, the vacuum system auxiliary materials on the surface are cleaned, the block bonding of the honeycomb is checked and impurities are cleaned, and if the honeycomb block is loose, it is repaired.

[0030] Laying the inner aramid fiber skin 6: applying resin glue on the surface of the aramid fiber honeycomb 7 and laying the inner aramid fiber skin 6, the inner aramid fiber skin 6 comprises aramid cloth and aramid fiber, the aramid fiber is laid to the edge of the aramid fiber honeycomb 7 and is 20 mm away from the seam edge of the single board mold in the working area, the aramid cloth is laid to the edge of the aramid fiber honeycomb 7 and is 40 mm away from the seam edge of the single board mold in the working area, and the aramid cloth and the aramid fiber are bonded by resin glue.

[0031] Vacuum and pressurize curing: Lay peeling cloth, breathable felt and high-temperature resistant vacuum bag film on the surface of aramid cloth and vacuum and pressurize to cure; the vacuum degree should not be lower than 80KPa, and demoulding can be carried out after curing for 6 hours at room temperature.

[0032] Further non-working area preparation steps include the following: Installing the aramid fiber honeycomb 7: placing a plurality of honeycombs in a single-board mold in a non-working area, making the area of ​​each honeycomb board as large as possible, squeezing the joint gaps between the honeycomb boards to make the joint gaps between the honeycombs as small as possible, and marking the honeycomb boards to obtain the aramid fiber honeycomb 7.

[0033] Fixing of edge strips: Edge strips are arranged in the non-working area of ​​the non-working area single board mold and close to the seam edge of the non-working area single board mold.

[0034] Laying of outer aramid fiber skin 8: Apply resin glue on the surface of aramid fiber honeycomb 7 and lay outer aramid fiber skin 8, the outer aramid fiber skin 8 includes three layers of glass fiber cloth, and the three layers of glass fiber cloth are laid on the sidewall strip or flange edge of the single plate mold in the non-working area. Overlapping treatment is adopted in the laying process of glass fiber cloth, and the overlap width is 20mm.

[0035] High-strength fiberglass cloth is laid on the bottom and flange edge of the mold in the non-working area to thicken and reinforce it, and high-strength fiberglass cloth impregnated with glue is laid on the edge strip, with the number of layers being no less than 15.

[0036] Vacuuming and pressurizing for curing: Paste sealing strips on the edge of the single board mold in the non-working area, and lay peeling cloth, breathable felt and high-temperature resistant vacuum bag film on the surface of the fiberglass cloth. Stick the vacuum bag film tightly to the single board mold in the working area with a sealing strip, reserve a vacuum detection position in the vacuum bag film, and use a vacuum pump to vacuum and pressurize for curing; the vacuum degree is not less than 80Kpa, and the curing time at room temperature is 6h.

[0037] Cleaning of aramid fiber honeycomb 7: clean the dust on the surface of aramid fiber honeycomb 7 and heat treat it at 80°C for more than one hour, apply resin glue on one side of aramid fiber honeycomb 7 and place the marked honeycomb panel on the inner surface of outer aramid fiber skin 8, and the boundary of aramid fiber honeycomb 7 is 20mm away from the seam edge of single board mold in the working area.

[0038] Aramid fiber honeycomb 7 pressurized curing: the surface of the aramid fiber honeycomb 7 is covered with peeling cloth, breathable felt and high temperature resistant vacuum bag film and vacuumed and pressurized for curing, the vacuum degree is not less than 80KPa, and the curing time is 4h at room temperature.

[0039] Aramid fiber honeycomb 7 high temperature curing: then carry out high temperature heat treatment at 80°C for heat curing and dehumidification, take out after curing for 1 hour, restore to room temperature to eliminate stress and then demould.

[0040] Laying the inner aramid fiber skin 6: Applying resin glue on the surface of the aramid fiber honeycomb 7 and laying the inner aramid fiber skin 6, the inner aramid fiber skin 6 includes three layers of glass fiber cloth, and the three layers of glass fiber cloth are laid on the sidewall strips or flange edges of the single plate mold in the non-working area. During the laying process of the glass fiber cloth, overlapping treatment is adopted, and the overlapping width is 20mm; Inner aramid fiber skin 6 pressurized curing: Lay peeling cloth, breathable felt and high temperature resistant vacuum bag film on the surface of glass fiber cloth and vacuum pressurize and cure; the vacuum degree is not less than 80KPa, and the curing time at room temperature is 6 hours before demoulding and the next step can be carried out.

[0041] Moisture-proof edge paving: After demoulding is completed by pressurized curing, the joint between the bottom of the non-working area and the aramid fiber honeycomb 7 is immediately paved and wrapped again using viscose polyvinyl chloride coated cloth to achieve moisture-proof edge paving and avoid water absorption from the bottom into the aramid material affecting the life performance of the cover plate; the length of the wrapping is 250mm-280mm, and the number of waterproof cloth paving layers is 2.

[0042] Curing of moisture-proof edge: Fix the moisture-proof edge firmly with a clamp and use breathable felt to absorb excess resin. Then place the antenna cover with moisture-proof edge in an oven with an isolation film and bake it. After baking is completed and the temperature returns to normal, it can be inspected. The baking time should not be less than 2 hours and the baking temperature should be 80°C.

[0043] Furthermore, the paint layer spraying step adopts the existing mature paint spraying operation procedures and sprays according to the principle of small amounts and multiple times.

[0044] Before spraying paint, use putty to flatten the uneven surfaces of the aramid fiber cloth, glass fiber cloth (fiberglass cloth) and polyvinyl chloride coated cloth of the cover plate, then use fine sandpaper to polish and clean them before spraying paint and baking.

[0045] Among them, the thickness of a single layer of paint is <200μm, the outer aramid fiber skin 8 is sprayed with fluorocarbon paint and color paint, and the inner aramid fiber skin 6 is sprayed with fluorocarbon paint and hydrophobic paint; the inner aramid fiber skin 6 is sprayed first, and then the outer aramid fiber skin 8 is sprayed, and the air pressure and paint amount are controlled each time spraying to prevent abnormal phenomena such as cracking, orange peel, shrinkage, and sagging; after each spraying, it is promptly baked in an oven at 70°C, and the single baking time should be no less than 30 minutes.

[0046] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used for various other combinations, modifications and improvements, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A millimeter wave radar radome, characterized in that: The radome comprises a first unit panel (1), a second unit panel (2), a third unit panel (3) and a mounting base ring (5), and the four parts form a spherical structure; the first unit panel (1) is located at the top of the spherical structure, the second unit panel (2) and the third unit panel (3) are located in the middle of the spherical structure, and the mounting base ring (5) is located at the bottom of the spherical structure; a hatch (4) is provided on the third unit panel (3); The first unit panel (1), the second unit panel (2), and the third unit panel (3) all comprise an inner aramid fiber skin (6) and an outer aramid fiber skin (8), an aramid fiber honeycomb (7) is bonded between the inner aramid fiber skin (6) and the outer aramid fiber skin (8), an outer paint layer is sprayed on the surface of the outer aramid fiber skin (8), and an inner paint layer is sprayed on the surface of the inner aramid fiber skin (6).

2. The millimeter wave radar radome according to claim 1, characterized in that: The radome comprises five second unit panels (2) and one third unit panel (3), wherein the six petal-shaped unit panels form a circle, one end of the second unit panel (2) and the third unit panel (3) are reinforced on a mounting base ring (5) by means of glass fiber reinforced plastic, and the first unit panel (1) is fixed to the other end of the second unit panel (2) and the third unit panel (3).

3. The millimeter wave radar radome according to claim 2, characterized in that: The first unit panel (1) and the second unit panel (2) constitute a radar wave-transmitting working area, and the third unit panel (3) is a radar non-working area.

4. A method for preparing a millimeter wave radar radome, characterized in that: The preparation method comprises: a working area single board preparation step, a non-working area preparation step and a paint layer spraying step; The steps of preparing the single board in the working area include: installing the aramid fiber honeycomb (7) and fixing the edge strip, paving the outer aramid fiber skin (8), vacuumizing and pressurizing and curing at room temperature and curing at high temperature, vacuumizing and pressurizing and curing at room temperature and curing at 80°C after the aramid fiber honeycomb (7) is installed, paving the inner aramid fiber skin (6) and vacuumizing and pressurizing and curing at room temperature; The non-working area preparation steps include: installing the aramid fiber honeycomb (7) and fixing the edge strips, paving and vacuum curing the outer aramid fiber skin (8) at room temperature, vacuum curing and pressurizing the aramid fiber honeycomb (7) at room temperature and curing at high temperature, and pressurizing and curing the inner aramid fiber skin (6), paving and curing the moisture-proof edge; The paint layer spraying step adopts the existing paint spraying operation procedures.

5. The method for preparing a millimeter wave radar radome according to claim 4, characterized in that: The step of installing the aramid fiber honeycomb (7) and fixing the edge strip in the working area single board preparation step comprises: Arrange multiple honeycomb blocks in a single-board mold in a working area to ensure that the area of ​​each honeycomb board is maximized, ensure that the splicing gaps between the honeycombs are minimized by squeezing the splicing gaps between the honeycombs, and mark the honeycomb boards to obtain aramid fiber honeycombs (7); In the wave-transmitting working area of ​​the single-board mold in the working area, and close to the seam edge of the single-board mold in the working area, a side retaining strip with a width greater than or equal to 15 mm is installed.

6. The method for preparing a millimeter wave radar radome according to claim 4, characterized in that: The steps of preparing the single board in the working area include laying the outer aramid fiber skin (8), vacuuming and pressurizing to cure at room temperature, and curing at high temperature: An outer aramid fiber skin (8) is laid on the surface of the single board mold in the working area, the outer aramid fiber skin (8) comprises aramid cloth and aramid fiber, the aramid fiber is laid on the outer surface of the aramid fiber honeycomb (7) and is 20 mm away from the seam edge of the single board mold in the working area, the aramid cloth is laid on the aramid fiber and is 40 mm away from the seam edge of the single board mold in the working area, and the aramid cloth and the aramid fiber are bonded by resin glue; Glue sealing strips on the edge of the single board mold in the working area, and lay peeling cloth, breathable felt and high-temperature resistant vacuum bag film on the surface of the aramid cloth. Use sealing strips to stick the vacuum bag film tightly to the single board mold in the working area, reserve a vacuum degree detection position in the vacuum bag film, and use a vacuum pump to evacuate and pressurize for curing; After being cured under pressure at room temperature, it is sent to an oven and heated to 60°C for heat curing and dehumidification.

7. The method for preparing a millimeter wave radar radome according to claim 5, characterized in that: In the working area single board preparation step, after the aramid fiber honeycomb (7) is installed, vacuuming and pressurizing and curing at room temperature and high temperature curing are performed, which includes: The dust on the surface of the aramid fiber honeycomb (7) is cleaned and heat-treated at a temperature of 80° C. for more than 1 hour, resin glue is applied to one side of the aramid fiber honeycomb (7) and the marked honeycomb panel is placed on the inner surface of the outer aramid fiber skin (8), and the boundary of the aramid fiber honeycomb (7) is 20 mm away from the seam edge of the single plate mold in the working area; The surface of the aramid fiber honeycomb (7) is covered with a peeling cloth, a breathable felt and a high temperature resistant vacuum bag film and cured under vacuum and pressure, and then subjected to a high temperature heat treatment at 80°C for heat curing and dehumidification. After curing for 1 hour, the honeycomb is taken out and restored to room temperature to eliminate stress.

8. The method for preparing a millimeter wave radar radome according to claim 4, characterized in that: The step of preparing the single board in the working area includes laying the inner aramid fiber skin (6) and vacuumizing and pressurizing to cure it at room temperature, which comprises: Applying resin glue on the surface of the aramid fiber honeycomb (7) and laying an inner aramid fiber skin (6), the inner aramid fiber skin (6) comprising aramid cloth and aramid fiber, the aramid fiber being laid to the edge of the aramid fiber honeycomb (7) and 20 mm away from the seam edge of the single plate mold in the working area, the aramid cloth being laid to the edge of the aramid fiber honeycomb (7) and 40 mm away from the seam edge of the single plate mold in the working area, and the aramid cloth and the aramid fiber being bonded by resin glue; The peeling cloth, breathable felt and high temperature resistant vacuum bag film are laid on the surface of the aramid cloth and then vacuumed and pressurized for curing.

9. The method for preparing a millimeter wave radar radome according to claim 5, characterized in that: The step of installing the aramid fiber honeycomb (7) and fixing the edge strip in the non-working area preparation step comprises: Arrange multiple honeycombs in a non-working area single-board mold to ensure that the area of ​​each honeycomb board is maximized, ensure that the splicing gaps between the honeycombs are minimized when the splicing gaps between the honeycombs are squeezed, and mark the honeycomb boards to obtain aramid fiber honeycombs (7); In the non-working area of ​​the non-working area single plate mold, a retaining strip is arranged close to the seam edge of the non-working area single plate mold; The steps of vacuumizing, pressurizing and curing the aramid fiber honeycomb (7) at room temperature and curing it at high temperature in the non-working area preparation step and the working area single board preparation step are consistent with the steps of vacuumizing, pressurizing and curing the aramid fiber honeycomb (7) at room temperature and curing it at high temperature in the working area single board preparation step.

10. The method for preparing a millimeter wave radar radome according to claim 4, characterized in that: The non-working area preparation step includes laying the outer aramid fiber skin (8) and vacuum curing at room temperature, which comprises: Applying resin glue on the surface of the aramid fiber honeycomb (7) and laying an outer aramid fiber skin (8), the outer aramid fiber skin (8) comprising three layers of glass fiber cloth, and the three layers of glass fiber cloth are laid on the single plate mold edge strip in the non-working area, and overlapping treatment is adopted during the laying process of the glass fiber cloth, and the overlapping width is 20 mm; Lay peeling cloth, breathable felt and high temperature resistant vacuum bag film on the surface of glass fiber cloth and vacuum and pressurize to cure; The non-working area preparation step includes pressurizing and curing the inner aramid fiber skin (6), laying the moisture-proof edge and curing the inner aramid fiber skin (6), including: Applying resin glue on the surface of the aramid fiber honeycomb (7) and laying an inner aramid fiber skin (6), wherein the inner aramid fiber skin (6) comprises three layers of glass fiber cloth, and the three layers of glass fiber cloth are laid on the sidewall strip of the single plate mold in the non-working area, and an overlap treatment is adopted during the laying process of the glass fiber cloth, and the overlap width is 20 mm; Lay high-strength fiberglass cloth on the bottom of the mold in the non-working area, and lay glue-impregnated high-strength fiberglass cloth on the edge strips, with the number of layers being no less than 15; After the demoulding is completed by pressurized curing, the joint between the bottom of the non-working area and the aramid fiber honeycomb (7) is immediately paved and edged again using a viscose polyvinyl chloride coated cloth to achieve moisture-proof edge paving; Fix the moisture-proof edge firmly with a clamp and use breathable felt to absorb excess resin. Place the antenna cover with moisture-proof edge in an oven with an isolation film and bake it. After baking is completed and the temperature returns to normal, it can be inspected.

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