An artificial corner reflector for synthetic aperture radar interferometry calibration

Abstract

The application discloses an artificial corner reflector for synthetic aperture radar interferometry calibration, and relates to the technical field of measurement and monitoring, and solves the technical problem that an existing corner reflector is not easy to adjust the angle after being fixed, and the technical scheme is as follows: the corner reflector comprises a corner reflecting plate, a vertical angle control device and a horizontal angle control device, the vertical angle control device has a movable part, the movable part of the vertical angle control device is connected with the corner reflecting plate, and is used for controlling the rotation angle of the corner reflecting plate in the vertical direction; the horizontal angle control device has a rotating part, the rotating part of the horizontal angle control device is connected with the vertical angle control device, and is used for controlling the rotation angle of the vertical angle control device in the horizontal direction, so as to control the rotation angle of the corner reflecting plate in the horizontal direction. The application can easily and accurately adjust the angles of the corner reflector in the horizontal and vertical directions, so as to satisfy the incidence of different satellite radar waves.

Description

Technical Field

[0001] This invention relates to the field of measurement and monitoring technology, and more specifically, to an artificial corner reflector for synthetic aperture radar interferometric calibration. Background Technology

[0002] Synthetic Aperture Radar Interferometry (InSAR) technology requires reliable and accurate SAR imagery as a prerequisite, i.e., quantitative remote sensing. This necessitates radiometric calibration and geometric correction of the InSAR imagery. Currently, a certain number of active and passive devices are typically deployed in the calibration field to achieve SAR radiometric calibration and geometric correction, using area targets or point targets as calibration devices. Compared to area targets, SAR radiometric calibration using reference points yields higher calibration accuracy and is a more commonly used method. An active radar calibrator is a radar signal transponder that receives the transmitted signal from the spaceborne SAR via a receiving antenna, amplifies it appropriately, and then transmits the signal back to the spaceborne SAR via a transmitting antenna. It mainly consists of a transmitting antenna, a receiving antenna, and a gain-controllable amplifier. Excessive echo energy from an active radar calibrator can affect the imaging of the SAR calibration area, hindering the radiometric calibration work of InSAR. Corner reflectors have a stable and large RCS and exhibit a 3dB beamwidth independent of wavelength and size. In addition, they have advantages such as ease of installation, stable performance, low cost, and simple structure. Therefore, it has become a commonly used passive calibration device in SAR radiometric calibration. It can be used as a reference target for SAR radiometric calibration and as a ground control point for SAR image geometric correction.

[0003] However, the current problems with corner reflectors are as follows: (1) For different commercial satellites, their flight trajectories and radar wave incident directions are different, and the commonly used corner reflectors are not easy to adjust after being fixed, especially the vertical angle, which leads to inaccurate corner reflectors when receiving incident signals from different satellites during calibration. (2) During use, the surface of the corner reflector needs to be kept smooth. If dust, rainwater, leaves, etc. fall on the surface, it will directly affect the effect of transmitting radar waves and affect the accuracy of the final result. (3) At present, corner reflectors are often used for one-time purposes. After being fixed to the concrete pile, they are not disassembled, which increases the cost of corner reflectors. Summary of the Invention

[0004] This invention solves the technical problem caused by the difficulty in adjusting the angle of commonly used corner reflectors after they are fixed. The purpose of this invention is to provide an artificial corner reflector for calibration of synthetic aperture radar interferometric measurements.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0006] This invention provides an artificial corner reflector for synthetic aperture radar interferometric calibration, comprising a corner reflector, a vertical angle control device, and a horizontal angle control device. The corner reflector includes a first reflector, a second reflector, and a third reflector, which are arranged perpendicularly to each other in pairs.

[0007] The vertical angle control device has a movable part, which is connected to the corner reflector and is used to control the rotation angle of the corner reflector in the vertical direction.

[0008] The horizontal angle control device has a rotating part, which is connected to the vertical angle control device and is used to control the rotation angle of the vertical angle control device in the horizontal direction, thereby controlling the rotation angle of the corner reflector in the horizontal direction.

[0009] Compared with the prior art, the present invention controls the vertical angle of the corner reflector by setting a vertical angle control device at the bottom of the corner reflector, and a horizontal angle control device at the bottom of the vertical angle control device to control the horizontal angle of the corner reflector. This allows for control of the spatial deflection angle of the corner reflector, thereby enabling rapid docking with different satellites.

[0010] Furthermore, the upper surface of the first reflector plate perpendicular to the second and third reflector plates is provided with a connector for fixing the second and third reflector plates to the first reflector plate;

[0011] The corner reflector also includes a box having a groove comprising two parts perpendicular to each other for receiving the tops of the second and third reflectors;

[0012] The connector includes a first hinge plate, a second hinge plate, and a connecting rod. The first and second hinge plates are used to fix the first reflector, the second reflector, and the third reflector. The first and second hinge plates are hinged to the connecting rod.

[0013] Furthermore, the vertical angle control device includes a control console for controlling the rotation angle of the movable part in the vertical direction;

[0014] The movable part includes a first vertical rod that can move up and down within the control console and a second vertical rod that is fixedly connected within the control console. The top ends of the first and second vertical rods are provided with a ball-like structure, and the bottom end of the first vertical rod is provided with an arc wheel.

[0015] The upper surface of the console is provided with through holes that are adapted to the first and second vertical rods;

[0016] The control console is equipped with a wheel set adapted to the arc wheel, and the control console is equipped with an annular wheel track that allows the wheel set to make annular displacement.

[0017] Furthermore, the second vertical rod is fixedly connected to the annular wheel track, and a hollow sphere adapted to the spherical structure is provided at the bottom of the first reflector, the hollow sphere being hinged to the spherical structure.

[0018] Furthermore, the control console is equipped with a driving device for driving the annular wheel assembly to make annular displacement on the wheel track. The driving device includes an electrode ring, an electrode control disk, an electrode group, and a battery pack. The electrode group is disposed inside the electrode ring, and the electrode control disk is mounted on the upper surface of the control console. The electrode ring is arc-shaped, and an arc-shaped cavity adapted to the electrode ring is opened on the side of the control console near the first vertical rod. The electrode ring is installed in the arc-shaped cavity. The electrode control disk controls the electrode group to generate magnetic force to drive the wheel assembly to make annular motion on the annular wheel track.

[0019] The battery pack is electrically connected to the electrode control panel, and the electrode control panel is electrically connected to the electrode pack.

[0020] Furthermore, the curvature of the upper surface of the wheel assembly that contacts the arc wheel first increases and then decreases.

[0021] Furthermore, the flat angle control device includes a base, on which a base is provided, and a rotating rod and an instrument panel are provided on the side of the base, with a portion of the rotating rod located inside the base;

[0022] One end of the rotating part is fixedly connected to the vertical angle control device, and the other end is connected to the rotating rod located in the base.

[0023] The instrument panel is used to read the angle of rotation of the rotating rod.

[0024] Furthermore, the base is fixedly connected to the concrete platform on the ground for fixing the artificial corner reflector.

[0025] Furthermore, the wheel assembly is made of magnetic material.

[0026] Furthermore, the connection between the connector and the corner reflector is a detachable connection.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. This invention controls the vertical angle of the corner reflector by setting a vertical angle control device at the bottom of the corner reflector, and a horizontal angle control device at the bottom of the vertical angle control device to control the horizontal angle of the corner reflector, thereby controlling the spatial deflection angle of the corner reflector and enabling rapid docking with different satellites.

[0029] 2. This invention connects the three parts of the corner reflector together using connectors, creating gaps between each corner reflector. When the vertical angle control device and the horizontal angle control device are running, dust, water droplets, leaves, and other impurities deposited on the corner reflector due to weather or other reasons can fall out through the gaps between the corner reflectors. This avoids affecting the reflection of satellite radar waves to a certain extent, which is more effective than the existing technology of directly opening holes in the corner reflector to remove impurities. Furthermore, opening holes in the corner reflector will affect the service life of the corner reflector and also have a certain impact on signal reception.

[0030] 3. The present invention has a base platform in the flat angle control device, which fixes the entire artificial corner reflector on the concrete, solving the problems of previous corner reflectors being difficult to disassemble and install and not reusable, thus reducing the cost of using corner reflectors. Attached Figure Description

[0031] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0032] Figure 1 This is a schematic diagram of the structure provided for an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of the corner reflector provided in an embodiment of the present invention;

[0034] Figure 3 This is another structural schematic diagram of the corner reflector provided in an embodiment of the present invention;

[0035] Figure 4 This is a top view of the vertical angle control device provided in an embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of the structure of the bottom of the first reflector provided in an embodiment of the present invention;

[0037] Figure 6 A three-dimensional structural diagram of the console provided in an embodiment of the present invention;

[0038] Figure 7 This is a schematic diagram of the structure of the first vertical rod and the wheel assembly provided in an embodiment of the present invention;

[0039] Figure 8A schematic diagram of the structure of the electrode ring provided in an embodiment of the present invention;

[0040] Figure 9 This is a schematic diagram of the flat angle control device provided in an embodiment of the present invention.

[0041] The attached diagram shows the markings and corresponding component names:

[0042] 1. Corner reflector; 2. Vertical angle control device; 3. Horizontal angle control device; 11. First reflector; 12. Second reflector; 13. Third reflector; 14. Sealing box; 15. Connector; 16. Hollow sphere; 21. First vertical rod; 22. Second vertical rod; 23. Wheel set; 24. Circular wheel track; 25. Electrode control panel; 26. Control console; 27. Electrode ring; 28. Battery; 29. ​​Spherical structure; 31. Rotating part; 32. Rotating rod; 33. Instrument panel; 34. Base; 35. Platform. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0044] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly or indirectly attached to that other component. When a component is referred to as being "connected to" another component, it can be directly or indirectly connected to that other component.

[0045] It should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0046] Example:

[0047] like Figure 1 As shown, this embodiment provides an artificial corner reflector for synthetic aperture radar interferometric calibration, including a corner reflector 1, a vertical angle control device 2, and a horizontal angle control device 3. The corner reflector 1 includes a first reflector 11, a second reflector 12, and a third reflector 13, which are arranged perpendicularly to each other in pairs.

[0048] The vertical angle control device 2 has a movable part, which is connected to the corner reflector 1 and is used to control the rotation angle of the corner reflector 1 in the vertical direction.

[0049] The flat angle control device 3 has a rotating part 31, which is connected to the vertical angle control device 2 and is used to control the rotation angle of the vertical angle control device 2 in the horizontal direction, thereby controlling the rotation angle of the corner reflector 1 in the horizontal direction.

[0050] For the connection of the first reflector 11, the second reflector 12, and the third reflector 13, please refer to [link / reference]. Figure 2 As shown, the first reflector 11, the second reflector 12 and the third reflector 13 are perpendicular to each other, forming a triangular pyramid-like structure to better receive the incident radar waves from the satellite.

[0051] In this embodiment, a vertical angle control device 2 is set at the bottom of the corner reflector 1 to control the vertical angle of the corner reflector 1, and a horizontal angle control device 3 is set at the bottom of the vertical angle control device 2 to control the horizontal angle of the corner reflector 1. This completes the control of the deflection angle of the corner reflector 1 in space, thereby enabling rapid docking with different satellites.

[0052] In another embodiment of this invention, the upper surface of the first reflector 11 at the point perpendicular to the second reflector 12 and the third reflector 13 is provided with a connector 15 for fixing the second reflector 12 and the third reflector 13 to the first reflector 11;

[0053] The corner reflector 1 also includes a box 14, which has a groove. The groove consists of two parts that are perpendicular to each other and are used to accommodate the tops of the second reflector 12 and the third reflector 13.

[0054] The connector 15 includes a first hinge plate, a second hinge plate, and a connecting rod. The first hinge plate and the second hinge plate are used to fix the first reflector 11, the second reflector 12, and the third reflector 13. The first hinge plate and the second hinge plate are hinged to the connecting rod.

[0055] Specifically, such as Figure 2As shown, connector 15 serves two purposes: first, to connect the various reflectors for easy disassembly; second, considering that the corner reflector will operate for extended periods in the field, connector 15 effectively cushions impacts to prevent direct damage to the shear plate. Connector 15 can be a planar hinge, typically a hinge plate, which is relatively inexpensive. The connection between the sealing box 14, the second reflector 12, and the third reflector 13 is assembled rather than welded. This serves two purposes: first, to facilitate disassembly; and second, to ensure the reflectors are perpendicular to each other, thus securing the two reflectors.

[0056] like Figure 3 As shown, after the reflector is fixedly connected by the connector 15, there is a connecting rod on the connector 15, which creates gaps between the reflectors. When the vertical angle control device 2 and the horizontal angle control device 3 are operated, the corner reflector 1 is tilted, which allows dust, rainwater and small leaves to flow out from the gaps, thus avoiding affecting the effect of reflecting satellite radar waves to a certain extent.

[0057] In another embodiment of this invention, the vertical angle control device 2 includes a control console 26 for controlling the rotation of the movable part in the vertical direction;

[0058] The movable part includes a first vertical rod 21 that can move up and down within the console 26 and a second vertical rod 22 that is fixedly connected within the console 26. The top ends of the first vertical rod 21 and the second vertical rod 22 are both provided with a ball-like structure 29, and the bottom end of the first vertical rod 21 is provided with an arc wheel.

[0059] The upper surface of the control console 26 is provided with through holes that are adapted to the first vertical rod 21 and the second vertical rod 22;

[0060] The control console 26 is provided with a wheel set 23 adapted to the arc wheel, and the control console 26 is provided with an annular wheel track 24 that allows the wheel set 23 to make annular displacement.

[0061] Specifically, such as Figure 4As shown, three circular through holes are provided on the control panel 26, which are adapted to the diameters of the first vertical rod 21 and the second vertical rod 22. The tops of both the first and second vertical rods 21 and 22 are provided with spherical structures 29 for movably connecting with the first reflector 11, allowing for adjustment of the corner reflector's vertical rotation angle. The movable first vertical rod 21 has an arc wheel at its bottom, enabling it to move vertically under the action of the wheel assembly 23. The fixed third vertical rod has a flat bottom, fixing it to the wheel track. It should be understood by those skilled in the art that since the wheel assembly 23 needs to slide on the annular wheel track 24, its contact surface must be smooth to facilitate sliding, and its shape must be identical to the annular wheel track 24 to prevent it from being affected by the annular wheel track 24 during sliding.

[0062] It should be noted that the first vertical rod 21, which can move up and down within the control console 26, and the second vertical rod 22, which is fixedly connected to the vertical rod displacement control, are preferably provided in the following embodiment: two first vertical rods 21 that can move up and down and one fixed third vertical rod. Of course, the number can also be increased appropriately, such as three first vertical rods 21 and two second vertical rods 22.

[0063] In another embodiment of this invention, the second vertical rod 22 is fixedly connected to the annular wheel track 24, and the bottom of the first reflector plate 11 is provided with a hollow sphere 16 adapted to the spherical structure 29, and the hollow sphere 16 is hinged to the spherical structure 29.

[0064] Specifically, such as Figure 5 and Figure 7 As shown, three hollow spheres 16 adapted to the spherical structure 29 are provided at the bottom of the first reflector 11. It should be noted that the number of hollow spheres 16 is determined by the number of vertical rods. The vertical rods are connected to the reflectors above them, with the bottom of the reflector at the connection point being a hollow sphere 16, which connects to the spherical structure 29 at the upper end of the vertical rod. This ensures that the movable vertical rod will not jam at the connection point with the reflector when it moves upward or downward, and that the first reflector 11 can tilt fully when the first vertical rod 21 moves up and down. This not only satisfies the requirement for satellite signal incidence but also allows dust and leaves on the first reflector 11 to be discharged through the openings. It should be noted that, as... Figure 7 As shown, when the first vertical rod 21 is at the highest point of the wheel set 23, it reaches the maximum upward deflection angle, and when it is at the lowest point of the wheel set 23, it reaches the maximum downward deflection angle. Therefore, the vertical angle control device 2 can only achieve angle control in part of the space, and thus can only control the deflection angle of the corner reflector in the vertical direction to a certain extent.

[0065] In another embodiment of this invention, the control console 26 is provided with a driving device for driving the annular wheel assembly 23 to make annular displacement on the wheel track. The driving device includes an electrode ring 27, an electrode control disk 25, an electrode assembly, and a battery assembly 28. The electrode assembly is disposed in the electrode ring 27, and the electrode control disk 25 is mounted on the upper surface of the control console 26. The electrode ring 27 is arc-shaped, and an arc-shaped cavity adapted to the electrode ring 27 is opened on the side of the control console 26 near the first vertical rod 21. The electrode ring 27 is installed in the arc-shaped cavity, and the electrode control disk 25 controls the electrode assembly to generate magnetic force to drive the wheel assembly 23 to make annular motion on the annular wheel track 24.

[0066] The battery group 28 is electrically connected to the electrode control disk 25, and the electrode control disk 25 is electrically connected to the electrode group.

[0067] Specifically, such as Figure 4 , Figure 6 and Figure 8 As shown, the control console 26 is cylindrical in shape, which reduces the air resistance caused by the other shapes when the subsequent flat-angle control device 3 drives the vertical-angle control device 2 to rotate. This embodiment describes how to make the wheel set 23 move back and forth on the annular wheel track 24. Since the wheel set 23 and the annular wheel track 24 slide relative to each other, the coefficient of friction between them is small. Therefore, the sliding of the wheel assembly 23 in the annular wheel track 24 is influenced by magnetic force. Considering that the actual length of the wheel assembly 23 is not long, an electrode assembly and an electrode ring 27 for placing the electrode assembly are provided. Since the movement takes place in the annular wheel track 24, the electrode ring 27 is formed into an arc shape identical to that of the control console 26. An arc cavity of the same size as the electrode ring 27 is opened on the side of the control console 26, and the electrode ring 27 is placed in the arc cavity. The position of the magnetic poles generated by the electrode assembly in the electrode ring 27 is controlled by the electrode control disk 25, thereby forming a magnetic field, controlling the sliding direction of the wheel assembly 23 in the annular wheel track 24, thereby controlling the displacement of the movable first vertical rod 21, and thus controlling the tilt of the corner reflector. It should be noted that the magnetic field generated by the battery 28, electrode ring 27, electrode assembly, and electrode control disk 25, and thus generating magnetic force, is existing technology, therefore, this embodiment will not explain its specific principle in detail. As should be understood by those skilled in the art, the battery 28 is generally a battery pack of 28, and is a rechargeable battery 28, and its connection with the electrode ring 27 is detachable.

[0068] In another embodiment of this invention, the curvature of the upper surface of the wheel assembly 23 that contacts the arc wheel first increases and then decreases.

[0069] Specifically, such as Figure 7As shown, considering that the vertical displacement needs to produce the same angle change, for example, the angle change produced by the first vertical rod 21 moving down 1cm and moving up 1cm should be the same, only the direction is different. Therefore, the curvature of the upper surface of the wheel set 23 in contact with the arc wheel increases first and then decreases when viewed from any end of the wheel set 23, which is equivalent to the wheel set 23 being symmetrical from left to right.

[0070] In another embodiment of this embodiment, the flat angle control device 3 includes a base 35, a base 34 is provided on the base 35, a rotating rod 32 and an instrument panel 33 are provided on the side of the base 34, and a part of the rotating rod 32 is located inside the base 34;

[0071] One end of the rotating part is fixedly connected to the vertical angle control device 2, and the other end is connected to the rotating rod 32 located in the base 34;

[0072] The instrument panel 33 is used to read the angle of rotation of the rotating rod 32.

[0073] Specifically, such as Figure 9 As shown, the horizontal angle control device 3 includes a rotating part 31, a base 34, a rotating rod 32, an instrument panel 33, and a base 35. The rotating part 31 is fixedly connected to the vertical angle control device 2 on it. The rotation of the rotating rod 32 will drive the rotating part 31 to rotate, thereby causing the corner reflector 1 to rotate. The rotating rod 32 is used to control the rotation angle of the rotating part 31. The instrument panel 33 can read the angle value of each rotation. By controlling the horizontal rotation angle, the bottom edge of the corner reflector can be made parallel to the flight direction of the SAR satellite. It should be noted that the horizontal angle control device 3 is a conventional technical means in the current field of corner reflector installation.

[0074] In another embodiment of this invention, the base 35 is fixedly connected to the concrete platform on the ground for fixing the artificial corner reflector.

[0075] Specifically, the base 35 is connected to the concrete platform on the ground by a threaded connection, which is used to fix the entire working instrument and facilitates subsequent disassembly for repeated use.

[0076] In yet another embodiment, the wheel assembly 23 is made of magnetic material.

[0077] Specifically, in order to facilitate better traction of the wheel assembly 23 by the electromagnetic force generated by the drive device, the wheel assembly 23 can be made of magnetic materials, such as iron, cobalt, nickel and their alloys.

[0078] In another embodiment of this invention, the connection between the connector 15 and the corner reflector 1 is a detachable connection.

[0079] Specifically, such as Figure 2 As shown, in order to facilitate later recycling, the connection between the hinge plate of the connector 15 and the corner reflector 1 can be made by screws and nuts. Threaded holes can be preset in the first reflector 11, the second reflector 12 and the third reflector 13. Each reflector can be fixedly connected by screws without causing mechanical damage to the corner reflector 1 or affecting the effect of the corner reflector 1 in receiving satellite radar waves.

[0080] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An artificial corner reflector for interferometric calibration of synthetic aperture radar, characterized in that, It includes a corner reflector (1), a vertical angle control device (2), and a horizontal angle control device (3). The corner reflector (1) includes a first reflector (11), a second reflector (12), and a third reflector (13), which are arranged perpendicularly to each other. The vertical angle control device (2) has a movable part, which is connected to the corner reflector (1) and is used to control the rotation angle of the corner reflector (1) in the vertical direction. The vertical angle control device (2) includes a control console (26) for controlling the rotation angle of the movable part in the vertical direction. The movable part includes a first vertical rod (21) that can move up and down in the control console (26) and a second vertical rod (22) that is fixedly connected in the control console (26). The top ends of the first vertical rod (21) and the second vertical rod (22) are provided with a spherical structure (29). The bottom end of the first vertical rod (21) is provided with an arc wheel. The upper surface of the control console (26) is provided with a through hole that is adapted to the first vertical rod (21) and the second vertical rod (22). The control console (26) is provided with a wheel set (23) that is adapted to the arc wheel. The control console (26) is provided with an annular wheel track (24) that allows the wheel set (23) to make annular displacement. The flat angle control device (3) has a rotating part (31), which is connected to the vertical angle control device (2) to control the rotation angle of the vertical angle control device (2) in the horizontal direction, thereby controlling the rotation angle of the corner reflector (1) in the horizontal direction.

2. The artificial corner reflector for synthetic aperture radar interferometric calibration according to claim 1, characterized in that, The upper surface of the first reflector (11) perpendicular to the second reflector (12) and the third reflector (13) is provided with a connector (15) for fixing the second reflector (12) and the third reflector (13) to the first reflector (11); The corner reflector (1) also includes a box (14) having a groove comprising two parts perpendicular to each other for receiving the tops of the second reflector (12) and the third reflector (13); The connector (15) includes a first hinge plate, a second hinge plate, and a connecting rod. The first hinge plate and the second hinge plate are used to achieve a fixed connection between the first reflector (11), the second reflector (12), and the third reflector (13). The first hinge plate and the second hinge plate are hinged to the connecting rod.

3. An artificial corner reflector for synthetic aperture radar interferometric calibration according to claim 1, characterized in that, The second vertical rod (22) is fixedly connected to the annular wheel track (24), and the bottom of the first reflector (11) is provided with a hollow ball (16) adapted to the spherical structure (29), and the hollow ball (16) is hinged to the spherical structure (29).

4. An artificial corner reflector for synthetic aperture radar interferometric calibration according to claim 1, characterized in that, The control console (26) is equipped with a drive device for driving the wheel assembly (23) to make a circular displacement on the wheel track. The drive device includes an electrode ring (27), an electrode control disk (25), an electrode assembly, and a battery (28) assembly. The electrode assembly is disposed in the electrode ring (27). The electrode control disk (25) is mounted on the upper surface of the control console (26). The electrode ring (27) is arc-shaped. An arc-shaped cavity adapted to the electrode ring (27) is opened on the side of the control console (26) near the first vertical rod (21). The electrode ring (27) is installed in the arc-shaped cavity. The electrode control disk (25) controls the electrode assembly to generate magnetic force to drive the wheel assembly (23) to make a circular motion on the circular wheel track (24). The battery (28) group is electrically connected to the electrode control disk (25), and the electrode control disk (25) is electrically connected to the electrode group.

5. An artificial corner reflector for synthetic aperture radar interferometric calibration according to claim 1, characterized in that, The curvature of the upper surface of the wheel assembly (23) that contacts the arc wheel increases first and then decreases.

6. An artificial corner reflector for synthetic aperture radar interferometric calibration according to claim 1, characterized in that, The flat angle control device (3) includes a base (35), a base (34) is provided on the base (35), a rotating rod (32) and an instrument panel (33) are provided on the side of the base (34), and a part of the rotating rod (32) is located inside the base (34); One end of the rotating part is fixedly connected to the vertical angle control device (2), and the other end is connected to the rotating rod (32) located in the base (34); The instrument panel (33) is used to read the angle of rotation of the rotating rod (32).

7. An artificial corner reflector for synthetic aperture radar interferometric calibration according to claim 6, characterized in that, The base (35) is fixedly connected to the concrete platform on the ground for fixing the artificial corner reflector.

8. An artificial corner reflector for synthetic aperture radar interferometric calibration according to claim 5, characterized in that, The wheel assembly (23) is made of magnetic material.

9. An artificial corner reflector for synthetic aperture radar interferometric calibration according to claim 2, characterized in that, The connection between the connector (15) and the corner reflector (1) is a detachable connection.

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