A corner reflector for InSAR deformation monitoring of asphalt road surfaces

Abstract

This invention relates to a corner reflector for InSAR deformation monitoring of asphalt road surfaces, comprising a first reflector plate, a second reflector plate, a reflector base plate, and a reflector housing. The reflector base plate is installed on the asphalt road surface. The first reflector plate covers the surface of the reflector base plate, and the second reflector plate is perpendicular to the surface of the reflector base plate. The reflector housing is fitted over one side of the reflector base plate, forming a semi-enclosed receiving space, within which both the first and second reflector plates are located. Compared with the prior art, this invention enhances the backscattering of radar signals through an orthogonal reflector structure, solving the problem of difficulty in obtaining settlement data in low-coherence areas and meeting the long-term deformation monitoring needs of asphalt roads. The semi-enclosed design effectively protects the internal reflector plates from wind, rain, and dust erosion, improving outdoor durability.

Description

Technical Field

[0001] This invention relates to synthetic aperture radar interferometry, and more particularly to a corner reflector for InSAR deformation monitoring of asphalt road surfaces. Background Technology

[0002] PS-InSAR (Permanent Scatterer Synthetic Aperture Radar Interferometry) is a high-precision remote sensing technique based on multi-temporal synthetic aperture radar (SAR) imagery. It detects minute surface deformations by extracting highly coherent permanent scatterer targets from the images. This technology has significant applications in urban land subsidence monitoring and geological disaster early warning. However, in asphalt road areas, the material properties of the road surface and interference from surrounding environmental factors result in low image coherence. This low coherence makes it difficult for PS-InSAR to extract sufficient permanent scatterer targets from the images, thus hindering the accurate acquisition of subsidence data for road areas. This severely limits the application of PS-InSAR in urban transportation infrastructure monitoring.

[0003] A search revealed that patent announcement number CN216560977U discloses a radar corner reflector and testing system, specifically disclosing that the radar corner reflector includes multiple reflectors, each reflector comprising a reflective surface, a side surface intersecting the reflective surface, a first mounting portion located at an assembly area on one edge of the reflective surface, and a second mounting portion located on the corresponding side surface and matching the first mounting portion. However, in this prior art, the reflectors lack protection and are susceptible to environmental interference.

[0004] Currently, most existing artificial corner reflectors are large in size and require a lot of space, making them unsuitable for direct installation on asphalt roads, which limits their practical application. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a corner reflector for InSAR deformation monitoring of asphalt road surfaces.

[0006] The objective of this invention can be achieved through the following technical solutions.

[0007] According to one aspect of the present invention, a corner reflector for InSAR deformation monitoring of asphalt road surfaces is provided, comprising a first reflector plate, a second reflector plate, a reflector base plate, and a reflector housing; the reflector base plate is installed on the asphalt road surface; the first reflector plate covers the surface of the reflector base plate, and the second reflector plate is perpendicular to the surface of the reflector base plate; the reflector housing is fitted over one side of the reflector base plate to form a semi-enclosed receiving space, wherein both the first reflector plate and the second reflector plate are located within the receiving space.

[0008] As a preferred technical solution, the reflector base plate includes a first mounting part and a second mounting part, with the first reflector plate covering the first mounting part.

[0009] As a preferred technical solution, the first mounting part is a regular polygon, the second mounting part is a rectangle, and one side of the second mounting part coincides with one side of the first mounting part.

[0010] As a preferred technical solution, the first mounting part is provided with a first mounting hole, and the first reflector is connected to the first mounting part through the first mounting hole; the second mounting part is provided with a second mounting hole, and the second mounting part is connected to the asphalt road surface through the second mounting hole.

[0011] As a preferred technical solution, the first reflector plate is provided with an elongated mounting hole, and the first reflector plate is connected to the reflector base plate through the elongated mounting hole and the first mounting hole.

[0012] As a preferred technical solution, the reflector housing includes multiple interconnected housing plates, the number of housing plates being less than the number of edges of the first mounting portion, and one side of each housing plate being welded to one edge of the first mounting portion.

[0013] As a preferred technical solution, the reflector base plate is 3mm thick, the first mounting part is a regular octagon with an inscribed circle diameter of 30mm; the first reflector plate has dimensions of 45×40×4mm, the second reflector plate has dimensions of 40×40×4mm; the reflector housing has a height of 40mm and a thickness of 2mm; and the corner reflector has an circumscribed circle diameter of 60mm.

[0014] As a preferred technical solution, the reflector base plate is a steel plate.

[0015] As a preferred technical solution, the first reflector and the second reflector are rectangular aluminum plates.

[0016] As a preferred technical solution, the edge of the reflector housing away from the reflector base plate is chamfered, and the edge close to the reflector base plate is blunted.

[0017] Compared with the prior art, the present invention has the following beneficial effects.

[0018] 1) This invention enhances the backscattering of radar signals through an orthogonal reflector structure, solving the problem of difficulty in obtaining settlement data in low-coherence areas and meeting the long-term deformation monitoring needs of asphalt roads. Its simple structure and small size improve the radar echo reflectivity of asphalt pavements while minimizing the impact of reflector installation on vehicle traffic. The semi-enclosed design of the reflector housing effectively protects the internal reflector from wind, rain, and dust erosion, improving outdoor durability. The reflector base plate is fixed to the road surface, enhancing overall stability and making it suitable for complex environments such as asphalt roads.

[0019] 2) The split design of the reflector base plate of this invention facilitates transportation and modular assembly, with clear structural partitions for easy installation. The first mounting part adopts a regular polygon to provide multi-directional installation adaptability; the first mounting part adopts a regular polygon and the second mounting part adopts a rectangle with one side overlapping, which not only ensures the regularity and symmetry of the reflection area and the stability of the echo signal, but also facilitates installation close to the road surface, improving the regularity and adaptability of the overall structure.

[0020] 3) This invention achieves a reliable connection between the first reflector and the base plate through the first mounting hole, and a firm fixation between the base plate and the asphalt road surface through the second mounting hole. The connection strength is high, and it is not easy to loosen or fall off in the road environment. The elongated mounting hole can adjust the installation position and angle of the first reflector within a certain range, which facilitates the optimization of the reflection direction and improves the adaptability of the corner reflector to InSAR monitoring signals.

[0021] 4) The reflector housing of this invention is composed of multiple housing plates, fewer in number than the number of sides of the first mounting part. This achieves semi-enclosed protection for the reflector plate while reducing material costs. Welded installation ensures structural strength meets usage requirements. The polygonal reflector housing protects the reflector plate from damage caused by passing vehicles while minimizing road bumps caused by corner reflectors, ensuring driving comfort and making it more suitable for installation on asphalt roads.

[0022] 5) The outer circle diameter of the present invention is 60mm, which is small in size and reduces the impact of the reflector installation on vehicle traffic on asphalt roads, while ensuring sufficient reflective area and structural strength to meet the engineering requirements for road deformation monitoring.

[0023] 6) The reflector base plate of this invention is made of steel plate, which has high structural strength, good rigidity, wear resistance, and impact resistance, and can adapt to working conditions such as asphalt road vehicle traffic and environmental loads, extending the service life of the corner reflector. The first and second reflector plates are made of rectangular aluminum plates, which are lightweight, have good electrical conductivity and reflectivity, and are not easy to rust, ensuring good InSAR signal reflection effect while facilitating processing and installation. The edges of the reflector shell are chamfered and blunted to reduce stress concentration, prevent sharp edges from scratching construction personnel or damaging equipment, and improve the shell's impact resistance, enhancing overall safety and durability. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the corner reflector of the present invention.

[0025] Figure 2 This is a front view of the corner reflector of the present invention.

[0026] Figure 3 This is a top view of the corner reflector of the present invention.

[0027] The numbers in the diagram are as follows: 1. First reflector plate; 2. Second reflector plate; 3. Reflector base plate; 30. First mounting part; 31. First mounting hole; 32. Second mounting part; 33. Second mounting hole; 4. Reflector housing; 40. Housing plate. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0029] Example 1 This invention provides a corner reflector for InSAR deformation monitoring of asphalt road surfaces, comprising a first reflector plate 1, a second reflector plate 2, a reflector base plate 3, and a reflector housing 4. (InSAR: Interferometric Synthetic Aperture Radar)

[0030] The reflector base plate 3 is installed on the asphalt road surface and includes a first mounting part 30 and a second mounting part 32. The first mounting part 30 is a regular polygon, and the second mounting part 32 is rectangular, with one side of the second mounting part 32 coinciding with one side of the first mounting part 30. The first mounting part 30 has two symmetrically arranged first mounting holes 31 and an elongated mounting hole. The first reflector plate 1 is connected to the reflector base plate 3 through the elongated mounting hole and the first mounting holes 31. The second mounting part 32 has a second mounting hole 33, and the second mounting part 32 is connected to the asphalt road surface through the second mounting hole 33.

[0031] The first reflector plate 1 covers the upper surface of the reflector base plate 3 and is in a horizontal state. The first reflector plate 1 is connected to the first mounting part 30 through the first mounting hole 31.

[0032] The second reflector 2 is perpendicular to the surface of the reflector base plate 3 (and also perpendicular to the first reflector 1), and is in a vertical state. The second reflector 2 is welded to the reflector housing 4 to ensure that it is perpendicular to the reflector base plate 3.

[0033] The reflector housing 4 includes multiple interconnected housing plates 40. The number of housing plates 40 is less than the number of sides of the first mounting part 30. One side of each housing plate 40 is welded to one edge of the first mounting part 30 to form a protective frame surrounding the first reflector plate 1 and the second reflector plate 2 (i.e., a semi-enclosed receiving space, in which both the first reflector plate 1 and the second reflector plate 2 are located). The edge near the reflector base plate 3 is blunted.

[0034] Example 2 The present invention provides a corner reflector for InSAR deformation monitoring of asphalt road surface. Compared with embodiment 1, the reflector base plate 3 is a steel plate with a thickness of 3mm, the first mounting part 30 is a regular octagonal steel plate with a radius of 30mm, and the second mounting part 32 is a rectangular steel plate with a diameter of 24.6×10mm.

[0035] The first reflector 1 and the second reflector 2 are both rectangular aluminum plates, wherein the first reflector 1 is a horizontal reflector 45×40×4mm and the second reflector 2 is a vertical reflector 40×40×4mm.

[0036] The reflector housing 4 is made of steel plate with a thickness of 2mm and a height of 40mm, and has a 45° chamfer on the top.

[0037] The overall diameter of the reflector's outer circle is only 60mm.

[0038] The material of the reflector base plate 3 is steel plate, but it is not limited to steel plate. Other materials with sufficient strength and stability can also be selected, and the size and shape of the reflector base plate 3 can be adjusted according to actual needs.

[0039] The materials for the first reflector 1 and the second reflector 2 are aluminum plates, but not limited to aluminum plates; other materials with good reflective properties can also be used. The dimensions of the vertical and horizontal reflectors can be adjusted according to actual monitoring needs to optimize the radar signal reflection effect.

[0040] This invention enhances radar signal backscattering through an orthogonal reflector structure formed by two sets of reflectors (first reflector 1 and second reflector 2), improving the radar echo reflectivity of asphalt road surfaces. This solves the problem of acquiring settlement data in low-coherence areas and meets the long-term deformation monitoring requirements of asphalt roads. The invention features a compact design, with an overall circumscribed circle diameter of only 60mm and an overall height of ≤40mm after installation. Therefore, while improving the radar echo reflectivity of asphalt roads, it minimizes the impact of reflector installation on vehicle traffic on asphalt roads.

[0041] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A corner reflector for InSAR deformation monitoring of asphalt road surfaces, characterized in that, It includes a first reflector plate (1), a second reflector plate (2), a reflector base plate (3), and a reflector housing (4); the reflector base plate (3) is installed on the asphalt road surface; the first reflector plate (1) covers the surface of the reflector base plate (3), and the second reflector plate (2) is perpendicular to the surface of the reflector base plate (3); the reflector housing (4) covers one side of the reflector base plate (3) to form a semi-enclosed receiving space, and the first reflector plate (1) and the second reflector plate (2) are both located within the receiving space.

2. A corner reflector for InSAR deformation monitoring of asphalt road surfaces according to claim 1, characterized in that, The reflector base plate (3) includes a first mounting part (30) and a second mounting part (32), and the first reflector plate (1) covers the first mounting part (30).

3. A corner reflector for InSAR deformation monitoring of asphalt road surfaces according to claim 2, characterized in that, The first mounting part (30) is a regular polygon, and the second mounting part (32) is a rectangle, with one side of the second mounting part (32) coinciding with one side of the first mounting part (30).

4. A corner reflector for InSAR deformation monitoring of asphalt road surfaces according to claim 2, characterized in that, The first mounting part (30) is provided with a first mounting hole (31), and the first reflector (1) is connected to the first mounting part (30) through the first mounting hole (31); the second mounting part (32) is provided with a second mounting hole (33), and the second mounting part (32) is connected to the asphalt road surface through the second mounting hole (33).

5. A corner reflector for InSAR deformation monitoring of asphalt road surfaces according to claim 3, characterized in that, The first reflector plate (1) is provided with an elongated mounting hole, and the first reflector plate (1) is connected to the reflector base plate (3) through the elongated mounting hole and the first mounting hole (31).

6. A corner reflector for InSAR deformation monitoring of asphalt road surfaces according to claim 2, characterized in that, The reflector housing (4) includes multiple interconnected housing plates (40), the number of which is less than the number of sides of the first mounting part (30), and one side of each housing plate (40) is welded to one edge of the first mounting part (30).

7. A corner reflector for InSAR deformation monitoring of asphalt road surfaces according to claim 2, characterized in that, The reflector base plate (3) is 3mm thick, the first mounting part (30) is a regular octagon with an inscribed circle diameter of 30mm; the first reflector plate (1) is 45×40×4mm in size, the second reflector plate (2) is 40×40×4mm in size; the reflector housing (4) is 40mm high and 2mm thick; the corner reflector has an circumscribed circle diameter of 60mm.

8. A corner reflector for InSAR deformation monitoring of asphalt road surfaces according to claim 1, characterized in that, The reflector base plate (3) is a steel plate.

9. A corner reflector for InSAR deformation monitoring of asphalt road surfaces according to claim 1, characterized in that, The first reflector (1) and the second reflector (2) are rectangular aluminum plates.

10. A corner reflector for InSAR deformation monitoring of asphalt road surfaces according to claim 1, characterized in that, The reflector housing (4) has a chamfered edge away from the reflector base plate (3) and a blunted edge near the reflector base plate (3).

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