Auxiliary positioning device for SAR (Synthetic Aperture Radar) imaging

Abstract

The utility model relates to the technical field of radar measurement, and discloses an auxiliary positioning device for SAR imaging. The auxiliary positioning device for SAR imaging comprises a supporting shaft, a plurality of corner reflectors and a plurality of connecting rod assemblies. The multiple corner reflectors are arranged outside one end of the supporting shaft in the circumferential direction. The connecting rod assemblies and the corner reflectors are arranged in a one-to-one correspondence mode. The connecting rod assembly comprises a first connecting rod and a second connecting rod. One end of the first connecting rod is movably connected with the supporting shaft, and the other end of the first connecting rod is connected with the corner reflector. One end of the second connecting rod is movably connected with the middle of the first connecting rod, and the other end is in sliding fit with the supporting shaft. The other end of the second connecting rod slides along the supporting shaft to drive the first connecting rod to rotate relative to the supporting shaft, and then the corner reflector is driven to rotate relative to the supporting shaft. According to the invention, the pitching angles of a plurality of corner reflectors can be synchronously adjusted, and strong reflection signals can be provided in all directions in the circumferential direction.

Description

Technical Field

[0001] The present application relates to the field of radar measurement technology, for example, to an auxiliary positioning device for SAR imaging. Background Art

[0002] At present, the attack or detection threats faced by ground or sea equipment mainly come from the air and change in two angles: azimuth and pitch. Therefore, in the equipment design demonstration evaluation and actual indicator verification, it is necessary to conduct radar tests on equipment models or real aircraft at different pitch angles and azimuth angles to obtain its scattering characteristic data at different pitch angles and azimuth angles, so as to further evaluate its ability to resist radar detection.

[0003] The detection of targets includes spaceborne SAR (Synthetic Aperture Radar) or airborne SAR imaging systems. Both spaceborne SAR and airborne SAR have the problems of high construction cost, poor flexibility and low dispatch efficiency, and cannot be used as a routine measurement method. Moreover, the test generally requires a large range of combined tests on multiple parameters such as azimuth, downward angle, frequency, polarization, etc., in order to conduct a comprehensive detection and perception of the target scattering characteristics, which are not easy to meet for spaceborne SAR or airborne SAR.

[0004] With the advancement of software and hardware technology, the conditions for realizing the core functions of the target characteristic measurement system with a smaller volume and weight have been met. For example, a small helicopter or drone can be used to mount a light and small measurement radar to achieve normalization of aerial detection, providing rich data support for equipment design or improvement. However, when testing targets with small helicopters or drones, due to the limitations of space, load, power supply, etc. of small helicopters or drones, and generally without high-precision navigation and positioning equipment, the control accuracy of the flight trajectory is poor, and it is easily affected by air currents, resulting in large jitters in attitude and position, which causes serious defocusing of SAR imaging images.

[0005] In the related art, an automatic focusing algorithm is proposed to reduce the defocusing situation. In the application, a fixed strong scattering structure is used in the imaging scene area, for example, a trihedral corner reflector is used as an auxiliary positioning point. The distance information contained in the echo of the strong scattering point can be used to calibrate the radar test echo phase, thereby achieving focusing and improving the SAR imaging quality.

[0006] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related art:

[0007] The strong scattering structure in the related technology (for example, the trihedral corner reflector) is fixedly installed, so that the pitch angle of the strong scattering structure cannot be adjusted and the azimuth angle is single, resulting in a weak reflection signal of the strong scattering structure under some test conditions, which in turn leads to poor adaptability of the auxiliary positioning function.

[0008] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0009] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0010] The embodiments of the present disclosure provide an auxiliary positioning device for SAR imaging, which can synchronously adjust the pitch angles of multiple corner reflectors, provide strong reflection signals in all circumferential directions, and improve the adaptability of the auxiliary positioning function.

[0011] In some embodiments, an auxiliary positioning device for SAR imaging is provided, comprising: a support shaft; a plurality of corner reflectors, circumferentially arranged on the outside of one end of the support shaft; a plurality of connecting rod assemblies, arranged one-to-one corresponding to the plurality of corner reflectors; the connecting rod assembly comprises a first connecting rod and a second connecting rod; one end of the first connecting rod is movably connected to the support shaft, and the other end of the first connecting rod is connected to the corner reflector; one end of the second connecting rod is movably connected to the middle part of the first connecting rod, and the other end of the second connecting rod is slidably matched with the support shaft; wherein the other end of the second connecting rod slides along the support shaft, driving the first connecting rod to rotate relative to the support shaft, and thereby driving the corner reflector to rotate relative to the support shaft.

[0012] Optionally, the auxiliary positioning device for SAR imaging further includes: a fixed column having a connecting cavity arranged along its axial direction; and an end of the support shaft away from the corner reflector is inserted into the connecting cavity of the fixed column.

[0013] Optionally, the auxiliary positioning device for SAR imaging also includes: a plurality of adjustment holes, which are circumferentially opened on the fixed column and are all connected to the connecting cavity; a plurality of fine-tuning parts, which correspond one-to-one to the plurality of adjustment holes, and the fine-tuning parts are inserted into the adjustment holes and abut against the support shaft.

[0014] Optionally, the auxiliary positioning device for SAR imaging further includes: a base plate, to which one end of the fixing column away from the supporting shaft is connected; and a leveling support member movably disposed on the base plate.

[0015] Optionally, the auxiliary positioning device for SAR imaging also includes: a fixed sleeve, which is arranged at the end of the support shaft close to the corner reflector; and a movable sleeve, which is slidably arranged on the outside of the support shaft; wherein, the end of the first connecting rod away from the corner reflector is movably connected to the fixed sleeve; and the end of the second connecting rod away from the first connecting rod is movably connected to the movable sleeve.

[0016] Optionally, the auxiliary positioning device for SAR imaging also includes: a first connecting member, fixedly arranged on the fixed sleeve, and movably connected to one end of the first connecting rod away from the corner reflector; a second connecting member, fixedly arranged on the first connecting rod, and movably connected to one end of the second connecting rod; a third connecting member, fixedly arranged on the movable sleeve, and movably connected to one end of the second connecting rod away from the first connecting rod.

[0017] Optionally, the auxiliary positioning device for SAR imaging also includes: a first plug-in hole, which is opened on the movable sleeve; multiple second plug-in holes, which are all opened on the support shaft and arranged along the axial direction of the support shaft; and a connector, which is inserted into the first plug-in hole and the corresponding second plug-in hole.

[0018] Optionally, the connector includes: a holding rod; and a plug-in rod connected to the holding rod and plugged into the first plug-in hole and the corresponding second plug-in hole.

[0019] Optionally, the auxiliary positioning device for SAR imaging further includes: a plurality of pitch angle scales, which are axially arranged on the surface of the support shaft; wherein the pitch angle scales correspond to the pitch angles of the corner reflectors.

[0020] Optionally, the elevation angle scale ranges from 20° to 70°.

[0021] The auxiliary positioning device for SAR imaging provided by the embodiments of the present disclosure can achieve the following technical effects:

[0022] The auxiliary positioning device for SAR imaging provided by the embodiment of the present disclosure has multiple corner reflectors arranged circumferentially on the outside of one end of a support shaft, that is, multiple corner reflectors are arranged circumferentially along the outside of one end of a support shaft, which can achieve circumferential azimuth coverage within a range of 360°, so that a strong reflection signal can be provided in each circumferential direction for auxiliary positioning.

[0023] In the auxiliary positioning device for SAR imaging provided by the embodiment of the present disclosure, multiple connecting rod assemblies are arranged in one-to-one correspondence with multiple corner reflectors, and the pitch angles of multiple corner reflectors can be adjusted synchronously through the multiple connecting rod assemblies, that is, each group of connecting rod assemblies can adjust the pitch angle of the corresponding corner reflector, which is convenient to operate. Through the cooperation of multiple corner reflectors and multiple connecting rod assemblies, it is possible to provide strong reflection signals in all circumferential directions for auxiliary positioning, thereby improving the adaptability of the auxiliary positioning function.

[0024] The auxiliary positioning device for SAR imaging provided by the embodiment of the present disclosure has one end of the first connecting rod movably connected to the support shaft, and the other end of the first connecting rod is connected to the corner reflector; one end of the second connecting rod is movably connected to the middle part of the first connecting rod, and the other end of the second connecting rod is slidably matched with the support shaft, so that the other end of the second connecting rod can slide along the support shaft, drive the first connecting rod to move relative to the support shaft, and then drive the corner reflector to move relative to the support shaft, so as to adjust the pitch angle of the corner reflector.

[0025] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0027] Figure 1 is a schematic diagram of the three-dimensional structure of an auxiliary positioning device provided by an embodiment of the present disclosure;

[0028] Figure 2 is a schematic diagram of a top view of the structure of an auxiliary positioning device provided by an embodiment of the present disclosure;

[0029] Figure 3 is a schematic diagram of a planar structure at an angle of an auxiliary positioning device provided by another embodiment of the present disclosure;

[0030] Figure 4 is a schematic diagram of the planar structure of an auxiliary positioning device provided by another embodiment of the present disclosure from another angle;

[0031] Figure 5 yes Figure 4 The enlarged view of point A in the middle;

[0032] Figure 6 is a schematic diagram of the arrangement relationship of a fixed column, a support shaft, a fixed sleeve and a movable sleeve provided by another embodiment of the present disclosure;

[0033] Figure 7 It is a partial structural schematic diagram of an auxiliary positioning device with a pitch angle of 20° for a corner reflector provided by another embodiment of the present disclosure;

[0034] Figure 8 It is a partial structural schematic diagram of an auxiliary positioning device with a pitch angle of 70° for a corner reflector provided by another embodiment of the present disclosure.

[0035] Reference numerals:

[0036] 10: auxiliary positioning device; 11: support shaft; 111: second plug-in hole; 12: corner reflector; 121: mouth surface; 13: bottom plate; 14: leveling support; 15: fixed sleeve; 16: movable sleeve; 161: first plug-in hole; 17: plug-in piece; 171: holding rod; 172: plug-in rod; 18: pitch angle scale; 19: linear bearing;

[0037] 20: connecting rod assembly; 21: first connecting rod; 22: second connecting rod; 23: first connecting member; 24: second connecting member; 25: third connecting member; 26: rotating shaft;

[0038] 30: fixing column; 31: adjusting hole; 32: fine-tuning part. DETAILED DESCRIPTION

[0039] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0040] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0041] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0042] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0043] Unless otherwise stated, the term "plurality" means two or more.

[0044] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0045] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0046] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0047] Knot Figures 1 to 8 As shown, an embodiment of the present disclosure provides an auxiliary positioning device 10 for SAR imaging. The auxiliary positioning device 10 for SAR imaging includes a support shaft 11, a plurality of corner reflectors 12, and a plurality of connecting rod assemblies 20. The plurality of corner reflectors 12 are circumferentially arranged outside one end of the support shaft 11. The plurality of connecting rod assemblies 20 are arranged one-to-one with the plurality of corner reflectors 12. The connecting rod assembly 20 includes a first connecting rod 21 and a second connecting rod 22. One end of the first connecting rod 21 is movably connected to the support shaft 11, and the other end of the first connecting rod 21 is connected to the corner reflector 12. One end of the second connecting rod 22 is movably connected to the middle part of the first connecting rod 21, and the other end of the second connecting rod 22 is slidably matched with the support shaft 11. Among them, the other end of the second connecting rod 22 slides along the support shaft 11, driving the first connecting rod 21 to rotate relative to the support shaft 11, and then driving the corner reflector 12 to rotate relative to the support shaft 11.

[0048] In the disclosed embodiment, a plurality of corner reflectors 12 are circumferentially arranged on the outside of one end of the support shaft 11, that is, a plurality of corner reflectors 12 are circumferentially arranged along the outside of one end of the support shaft 11, so as to achieve circumferential azimuth coverage within a range of 360°, so that a strong reflection signal can be provided in each circumferential direction for auxiliary positioning.

[0049] In the disclosed embodiment, multiple connecting rod assemblies 20 are arranged in one-to-one correspondence with multiple corner reflectors 12, and the pitch angles of multiple corner reflectors 12 can be adjusted synchronously through the multiple connecting rod assemblies 20, that is, each group of connecting rod assemblies 20 can adjust the pitch angle of the corresponding corner reflector 12, which is convenient to operate. Through the cooperation of multiple corner reflectors 12 and multiple connecting rod assemblies 20, it is possible to provide strong reflection signals in all circumferential directions for auxiliary positioning, thereby improving the adaptability of the auxiliary positioning function.

[0050] In the disclosed embodiment, one end of the first connecting rod 21 is movably connected to the support shaft 11, and the other end of the first connecting rod 21 is connected to the corner reflector 12; one end of the second connecting rod 22 is movably connected to the middle part of the first connecting rod 21, and the other end of the second connecting rod 22 is slidably matched with the support shaft 11, so that the other end of the second connecting rod 22 can slide along the support shaft 11, drive the first connecting rod 21 to move relative to the support shaft 11, and then drive the corner reflector 12 to move relative to the support shaft 11, so as to realize the adjustment of the pitch angle of the corner reflector 12.

[0051] In the disclosed embodiment, the auxiliary positioning device 10 has a simple structure, low construction cost, high flexibility, and high deployment efficiency, and can be used as a daily routine measurement auxiliary means.

[0052] In practical application, the auxiliary positioning device 10 of the present application can be used as an electromagnetic wave circumferential reflection structure that synchronously adjusts the pitch angles of multiple corner reflectors 12, and can provide strong reflection signals in all circumferential directions for auxiliary positioning, meeting the coverage requirements of multiple pitch angles and circumferential azimuths for target detection in the air. The radar test echo phase can be calibrated by using the distance information contained in the echo of the corner reflector 12 (strong scattering point), thereby achieving higher quality focusing and effectively improving the SAR imaging quality.

[0053] Optionally, the first connecting rod 21 is fixedly connected to the corner reflector 12 .

[0054] Combination Figures 1 to 4 as well as Figure 7 and Figure 8 As shown, optionally, the corner reflector 12 adopts a three-sided corner reflector to achieve strong scattering.

[0055] It is understandable that the corner reflector 12 is not limited to the trihedral corner reflector, and other types of corner reflectors 12 are also applicable to adjust the pitch angle of the corner reflector 12. Moreover, other strong scattering structures that need to be pitched can also adopt the solution of this embodiment.

[0056] Optionally, the number of corner reflectors 12 is equal to the number of connecting rod assemblies 20 , so that a plurality of connecting rod assemblies 20 are arranged in a one-to-one correspondence with a plurality of corner reflectors 12 , thereby enabling each group of connecting rod assemblies 20 to adjust the pitch angle of the corresponding corner reflector 12 .

[0057] It is understandable that the number of corner reflectors 12 is not limited, for example, 5, 6, 8 or 10.

[0058] Combination Figure 2 As shown, optionally, a plurality of corner reflectors 12 are evenly arranged along the outer circumference of one end of the support shaft 11 to improve the circumferential azimuth coverage effect within a range of 360°.

[0059] Combination Figure 1 , Figure 3 , Figure 4 and Figure 6 As shown, in some embodiments, the auxiliary positioning device 10 for SAR imaging further includes a fixing column 30. The fixing column 30 has a connecting cavity arranged along the axial direction of the fixing column 30. One end of the support shaft 11 away from the corner reflector 12 is inserted into the connecting cavity of the fixing column 30.

[0060] In this embodiment, the fixing column 30 has a connecting cavity arranged along its axial direction, which can be understood as: a deep hole extending along the axial direction of the fixing column 30 is opened on one end surface of the fixing column 30 to form a connecting cavity for supporting the installation of the shaft 11.

[0061] In this embodiment, one end of the support shaft 11 away from the corner reflector 12 is inserted into the connecting cavity of the fixing column 30 to improve the stability of the support shaft 11 .

[0062] Combination Figure 1 , Figure 3 , Figure 4 as well as Figures 6 to 8 As shown, in some embodiments, the auxiliary positioning device 10 for SAR imaging further includes a plurality of adjustment holes 31 and a plurality of fine-tuning members 32. The plurality of adjustment holes 31 are circumferentially arranged on the fixing column 30, and the plurality of adjustment holes 31 are all connected to the connecting cavity. The plurality of fine-tuning members 32 correspond to the plurality of adjustment holes 31 one by one. The fine-tuning members 32 are inserted into the adjustment holes 31 and abut against the support shaft 11.

[0063] In this embodiment, a plurality of adjustment holes 31 are provided in the fixing column 30 along the circumferential direction. When the fine-tuning member 32 is inserted into the adjustment hole 31, the support shaft 11 can be supported and adjusted from different directions. The plurality of adjustment holes 31 are all connected to the connecting cavity, so that the fine-tuning member 32 can be inserted into the adjustment hole 31 and enter the connecting cavity to abut against the support shaft 11 inserted into the connecting cavity.

[0064] In this embodiment, a plurality of fine-tuning members 32 correspond to a plurality of adjustment holes 31 one by one, so that each adjustment hole 31 is provided with a corresponding fine-tuning member 32, so that each fine-tuning member 32 can be inserted into the adjustment hole 31 and abut against the support shaft 11. The fine-tuning member 32 is inserted into the adjustment hole 31 and abuts against the support shaft 11, so as to support and fix the support shaft 11, and improve the stability of the support shaft 11 during the pitch angle adjustment process of the corner reflector 12. Moreover, by adjusting the circumferential support of the support shaft 11 by different fine-tuning members 32, the vertical state of the support shaft 11 can be fine-tuned to improve the accuracy of the support shaft 11 in the vertical state.

[0065] Optionally, the adjusting hole 31 is a threaded hole, and the fine-tuning member 32 is a screw. The screw and the threaded hole are threadedly matched to achieve the movement of the fine-tuning member 32 relative to the adjusting hole 31.

[0066] It is understandable that there is no limitation on the specific type of the fine-tuning member 32. For example, the fine-tuning member 32 is a flat-end set screw.

[0067] Optionally, a plurality of adjustment holes 31 are evenly arranged along the circumference of the fixing column 30 to achieve uniform support and adjustment of the support shaft 11 .

[0068] Combination Figure 1 , Figure 3 and Figure 4 As shown, in some embodiments, the auxiliary positioning device 10 for SAR imaging further includes a base plate 13 and a leveling support 14. One end of the fixing column 30 away from the support shaft 11 is connected to the base plate 13. The leveling support 14 is movably disposed on the base plate 13.

[0069] In this embodiment, one end of the fixing column 30 away from the support shaft 11 is connected to the bottom plate 13 to improve the stability of the fixing column 30 in fixing the support shaft 11. When in use, the bottom plate 13 facilitates the installation of the auxiliary positioning device 10. The leveling support member 14 is movably arranged on the bottom plate 13, so that the leveling support member 14 can move relative to the bottom plate 13, so that the leveling support member 14 can both support the bottom plate 13 and level the bottom plate 13.

[0070] Combination Figure 1 , Figure 3 and Figure 4 As shown, optionally, a plurality of leveling support members 14 are provided, and the plurality of leveling support members 14 are evenly arranged on the bottom plate 13 , and the bottom plate 13 can be leveled by adjusting different leveling support members 14 .

[0071] It is understandable that the number of the leveling support members 14 is not limited. For example, the number of the leveling support members 14 is 4, 6, or 8.

[0072] Combination Figure 1 , Figure 3 and Figure 4 As shown, optionally, the leveling support 14 adopts a load-bearing foot cup. The load-bearing foot cup is threadedly connected to the bottom plate 13.

[0073] In this embodiment, the load-bearing foot cup is threadedly connected to the bottom plate 13 , so that the load-bearing foot cup can move relative to the bottom plate 13 to level the bottom plate 13 .

[0074] It is understandable that the shape of the bottom plate 13 is not limited. For example, the shape of the bottom plate 13 is circular or polygonal.

[0075] It is understandable that there is no limitation on the material of the bottom plate 13. For example, the material of the bottom plate 13 is aluminum alloy.

[0076] Exemplary, combined Figure 1 As shown, the bottom plate 13 is circular in shape and four leveling support members 14 are provided as an example. A plurality of threaded holes are provided at the center of the bottom plate 13, and a flange with a plurality of through holes is provided at one end of the fixing column 30 away from the support shaft 11. The fixing column 30 is connected to the bottom plate 13 through the threaded holes of the bottom plate 13 and the through holes of the flange. For example, the bottom plate 13 and the flange are connected by bolts. Four threaded holes can also be symmetrically provided on the bottom plate 13 for installing four leveling support members 14.

[0077] Combination Figure 1 , Figure 3 , Figure 4 as well as Figures 6 to 8 As shown, in some embodiments, the auxiliary positioning device 10 for SAR imaging further includes a fixed sleeve 15 and a movable sleeve 16. The fixed sleeve 15 is disposed at an end of the support shaft 11 close to one end of the corner reflector 12. The movable sleeve 16 is slidably disposed outside the support shaft 11. Among them, one end of the first connecting rod 21 away from the corner reflector 12 is movably connected to the fixed sleeve 15. One end of the second connecting rod 22 away from the first connecting rod 21 is movably connected to the movable sleeve 16.

[0078] In this embodiment, the fixing sleeve 15 is disposed at the end of the support shaft 11 close to the corner reflector 12, that is, the fixing sleeve 15 is fixed to the end of the support shaft 11 close to the corner reflector 12. The end of the first connecting rod 21 away from the corner reflector 12 is movably connected to the fixing sleeve 15 to realize the movably connection between the first connecting rod 21 and the support shaft 11, thereby realizing the rotation of the first connecting rod 21 relative to the support shaft 11.

[0079] In this embodiment, the movable sleeve 16 is slidably disposed outside the support shaft 11, so that the movable sleeve 16 can slide relative to the support shaft 11. The end of the second connecting rod 22 away from the first connecting rod 21 is movably connected to the movable sleeve 16, so that when the movable sleeve 16 slides relative to the support shaft 11, the second connecting rod 22 is driven to slide along the support shaft 11, that is, the second connecting rod 22 and the support shaft 11 are slidably matched.

[0080] In this embodiment, the fixed sleeve 15 is movably connected to the first links 21 of the plurality of link assemblies 20, and the movable sleeve 16 is movably connected to the second links 22 of the plurality of link assemblies 20. The movable sleeve 16 slides relative to the support shaft 11, driving the second links 22 of the plurality of link assemblies 20 to slide along the support shaft 11, thereby driving the first links 21 of the plurality of link assemblies 20 to rotate relative to the support shaft 11, thereby achieving synchronous adjustment of the pitch angles of the plurality of corner reflectors 12.

[0081] Combination Figure 6 As shown, optionally, the auxiliary positioning device 10 further includes a linear bearing 19. The linear bearing 19 is fixedly connected to the movable sleeve 16. The inner circle of the linear bearing 19 is concentrically slidably matched with the outer circle of the support shaft 11 to achieve smooth sliding of the movable sleeve 16 relative to the support shaft 11.

[0082] Exemplarily, the linear bearing 19 is a standard part.

[0083] Combination Figure 7 and Figure 8 As shown, in some embodiments, the auxiliary positioning device 10 for SAR imaging further includes a first connecting member 23, a second connecting member 24, and a third connecting member 25. The first connecting member 23 is fixed to the fixed sleeve 15, and the first connecting member 23 is movably connected to an end of the first connecting rod 21 away from the corner reflector 12. The second connecting member 24 is fixed to the first connecting rod 21, and the second connecting member 24 is movably connected to an end of the second connecting rod 22. The third connecting member 25 is fixed to the movable sleeve 16, and the third connecting member 25 is movably connected to an end of the second connecting rod 22 away from the first connecting rod 21.

[0084] In this embodiment, the first connecting member 23 is fixed to the fixing sleeve 15, and the first connecting member 23 is movably connected to one end of the first connecting rod 21 away from the corner reflector 12. That is to say, one end of the first connecting member 23 is fixedly connected to the fixing sleeve 15, and the other end of the first connecting member 23 is movably connected to one end of the first connecting rod 21 away from the corner reflector 12, so that when the fixing sleeve 15 is set on the support shaft 11, the first connecting rod 21 can be movably connected to the support shaft 11.

[0085] In this embodiment, the second connecting member 24 is fixedly arranged in the middle part of the first connecting rod 21, and the second connecting member 24 is movably connected to one end of the second connecting rod 22. That is to say, one end of the second connecting member 24 is fixedly connected to the middle part of the first connecting rod 21, and the other end of the second connecting member 24 is movably connected to one end of the second connecting rod 22, so that when the other end of the second connecting rod 22 slides along the support shaft 11, the first connecting rod 21 can be driven to rotate relative to the support shaft 11.

[0086] In this embodiment, the third connecting member 25 is fixed to the movable sleeve 16, and the third connecting member 25 is movably connected to one end of the second connecting rod 22 away from the first connecting rod 21. That is to say, one end of the third connecting member 25 is fixedly connected to the movable sleeve 16, and the other end of the third connecting member 25 is movably connected to one end of the second connecting rod 22 away from the first connecting rod 21, so as to realize that when the movable sleeve 16 slides relative to the support shaft 11, the second connecting rod 22 is driven to slide along the support shaft 11.

[0087] Combination Figure 7 and Figure 8 As shown, optionally, the auxiliary positioning device 10 further includes a plurality of rotating shafts 26. The other end of the first connecting member 23 is connected to the end of the first connecting rod 21 away from the corner reflector 12 through the rotating shaft 26, so as to realize the movable connection between the other end of the first connecting member 23 and the end of the first connecting rod 21 away from the corner reflector 12. The other end of the second connecting member 24 is connected to one end of the second connecting rod 22 through the rotating shaft 26, so as to realize the movable connection between the other end of the second connecting member 24 and one end of the second connecting rod 22. The other end of the third connecting member 25 is connected to the end of the second connecting rod 22 away from the first connecting rod 21 through the rotating shaft 26, so as to realize the movable connection between the other end of the third connecting member 25 and the end of the second connecting rod 22 away from the first connecting rod 21.

[0088] It can be understood that the other end of the first connecting member 23 is movably connected to the end of the first connecting rod 21 away from the corner reflector 12, the other end of the second connecting member 24 is movably connected to one end of the second connecting rod 22, and the other end of the third connecting member 25 is movably connected to the end of the second connecting rod 22 away from the first connecting rod 21. The specific method of the movable connection is not limited to the use of the rotating shaft 26, and it is also applicable to achieve the movable connection by other methods in the prior art.

[0089] Combination Figure 3 and Figure 6 As shown, in some embodiments, the auxiliary positioning device 10 for SAR imaging further includes a first plug hole 161, a plurality of second plug holes 111 and a plug connector 17. The first plug hole 161 is provided in the movable sleeve 16. The plurality of second plug holes 111 are all provided in the support shaft 11, and the plurality of second plug holes 111 are arranged along the axial direction of the support shaft 11. The plug connector 17 is inserted in the first plug hole 161 and the corresponding second plug holes 111.

[0090] In this embodiment, the first plug-in hole 161 is opened on the movable sleeve 16, and the multiple second plug-in holes 111 are all opened on the support shaft 11, and the multiple second plug-in holes 111 are arranged along the axial direction of the support shaft 11, so that when the movable sleeve 16 slides to the target position (the required pitch angle scale 18) relative to the axial direction of the support shaft 11, the connector 17 is inserted into the first plug-in hole 161 and the corresponding second plug-in hole 111 to fix the position of the movable sleeve 16, so as to fix the corner reflector 12 to the required pitch angle.

[0091] Exemplary, combined Figures 4 to 6 As shown, part of the surface of the support shaft 11 is milled into a plane, and a plurality of second plug holes 111 are opened on the plane along the axial direction of the support shaft 11 to facilitate the sliding of the movable sleeve 16 relative to the support shaft 11 .

[0092] Combination Figure 3 , Figure 4 and Figure 6 As shown, in some embodiments, the plug connector 17 includes a gripping rod 171 and a plugging rod 172. The plugging rod 172 is connected to the gripping rod 171. The plugging rod 172 is plugged into the first plugging hole 161 and the corresponding second plugging hole 111.

[0093] In this embodiment, the gripping rod 171 is convenient for gripping during use. The plug-in rod 172 is connected to the gripping rod 171, and the plug-in rod 172 is inserted into the first plug-in hole 161 and the corresponding second plug-in hole 111 to achieve concentric connection between the first plug-in hole 161 and the corresponding second plug-in hole 111, thereby fixing the movable sleeve 16 and the support shaft 11.

[0094] Optionally, the connector 17 is a T-shaped plug.

[0095] Exemplary, combined Figure 2 and Figure 6As shown, an example is taken that eight corner reflectors 12 are provided. The fixed sleeve 15 adopts an octagonal fixed sleeve 15, and the movable sleeve 16 adopts an octagonal movable sleeve 16. Four through holes are provided at one end of the octagonal fixed sleeve 15, and four threaded holes are provided at the end face of the support shaft 11 close to the corner reflector 12, so as to fix the octagonal fixed sleeve 15 to the end face of the support shaft 11. The octagonal fixed sleeve 15 has eight side faces, and two threaded holes are provided on each side face for installing the first connecting member 23. Four threaded holes are provided at one end of the octagonal movable sleeve 16 for fixed connection with the flange surface of the linear bearing 19. The octagonal movable sleeve 16 has eight side faces, and two threaded holes are provided on each side face for installing the third connecting member 25. A through hole is provided on the end face of the octagonal movable sleeve 16 to leave space for the installation of the linear bearing 19. A first plug hole 161 is provided on one side face of the octagonal movable sleeve 16 for plugging and unplugging the connector 17.

[0096] Combination Figure 4 , Figure 5 , Figure 7 and Figure 8 As shown, in some embodiments, the auxiliary positioning device 10 for SAR imaging further includes a plurality of pitch angle scales 18. The plurality of pitch angle scales 18 are axially arranged on the surface of the support shaft 11. The pitch angle scales 18 correspond to the pitch angles of the corner reflector 12.

[0097] In this embodiment, a plurality of pitch angle scales 18 are axially arranged on the surface of the support shaft 11 , and the pitch angle scales 18 correspond to the pitch angles of the corner reflector 12 , so that the pitch angle scales 18 can indicate the current pitch angle of the corner reflector 12 .

[0098] It can be understood that the support shaft 11 is provided with a second plug hole 111 corresponding to each pitch angle scale 18, that is, when the movable sleeve 16 slides to any pitch angle scale 18 relative to the axial direction of the support shaft 11, there is a second plug hole 111 corresponding to the first plug hole 161, so that the plug-in component 17 is inserted into the first plug hole 161 and the corresponding second plug hole 111, the position of the movable sleeve 16 is fixed, and then the pitch angle of the corner reflector 12 is fixed. That is, the pitch angle of the current corner reflector 12 is the pitch angle scale 18 corresponding to the movable sleeve 16.

[0099] Combination Figure 7 and Figure 8 As shown, in some embodiments, the pitch angle scale 18 ranges from 20° to 70°.

[0100] In this embodiment, the pitch angle scale 18 has a range of 20° to 70°, so that the pitch angle of the corner reflector 12 can be adjusted to a range of 20° to 70°.

[0101] Optionally, the plurality of elevation angle scales 18 are respectively 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, and 70°.

[0102] Optionally, the outer surfaces of the remaining structures in the auxiliary positioning device 10 except the corner reflector 12 are provided with absorbing materials to reduce reflection.

[0103] It is understandable that the absorbing material is not limited, for example, ferrite powder, SiC powder, etc.

[0104] The working principle of the auxiliary positioning device 10 for SAR imaging in this embodiment is as follows:

[0105] The leveling support member 14 is adjusted to level the bottom plate 13 so that the fixing column 30 is in a vertical state.

[0106] Insert the end of the support shaft 11 away from the corner reflector 12 into the connecting cavity of the fixing column 30, and adjust the fine-tuning member 32 to make the support shaft 11 in a vertical state.

[0107] The fixed sleeve 15 and the movable sleeve 16 are mounted on the support shaft 11. A plurality of connecting rod assemblies 20 to which the corner reflectors 12 are connected are mounted on the fixed sleeve 15 and the movable sleeve 16.

[0108] The outer surfaces of the remaining structures except the corner reflector 12 are all covered with absorbing materials.

[0109] The movable sleeve 16 is adjusted to slide along the axial direction of the support shaft 11, driving the multiple connecting rod assemblies 20 to move, so as to adjust the pitch angle of the corner reflector 12 within the range of 20° to 70°. When the movable sleeve 16 moves to the required pitch angle scale 18 (the required pitch angle of the corner reflector 12), the connector 17 is inserted into the first plug hole 161 and the corresponding second plug hole 111 to fix the pitch angle of the corner reflector 12. The pitch angles of multiple corner reflectors 12 are adjusted synchronously, thereby providing strong reflection signals in all circumferential directions for auxiliary positioning.

[0110] In this embodiment, the pitch angle of the corner reflector 12 is the angle between the opening surface 121 of the corner reflector 12 and a reference plane (eg, a horizontal plane).

[0111] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An auxiliary positioning device for SAR imaging, characterized in that: include: Support shaft; A plurality of corner reflectors are circumferentially arranged outside one end of the support shaft; A plurality of connecting rod assemblies are arranged corresponding to the plurality of corner reflectors; the connecting rod assembly comprises a first connecting rod and a second connecting rod; one end of the first connecting rod is movably connected to the support shaft, and the other end of the first connecting rod is connected to the corner reflector; one end of the second connecting rod is movably connected to the middle part of the first connecting rod, and the other end of the second connecting rod is slidably matched with the support shaft; The other end of the second connecting rod slides along the supporting shaft, driving the first connecting rod to rotate relative to the supporting shaft, thereby driving the corner reflector to rotate relative to the supporting shaft.

2. The auxiliary positioning device for SAR imaging according to claim 1, characterized in that: Also includes: A fixed column having a connecting cavity arranged along its axial direction; One end of the support shaft away from the corner reflector is inserted into the connecting cavity of the fixing column.

3. The auxiliary positioning device for SAR imaging according to claim 2, characterized in that: Also includes: A plurality of adjustment holes are circumferentially arranged on the fixing column and are all connected to the connecting cavity; A plurality of fine-tuning pieces correspond to the plurality of adjusting holes one by one, and the fine-tuning pieces are inserted into the adjusting holes and abut against the supporting shafts.

4. The auxiliary positioning device for SAR imaging according to claim 2, characterized in that: Also includes: A bottom plate, one end of the fixing column away from the supporting shaft is connected to the bottom plate; The leveling support is movably arranged on the bottom plate.

5. The auxiliary positioning device for SAR imaging according to any one of claims 1 to 4, characterized in that: Also includes: A fixing sleeve is arranged at an end of the supporting shaft close to one end of the corner reflector; A movable sleeve is slidably arranged outside the supporting shaft; Among them, one end of the first connecting rod away from the corner reflector is movably connected to the fixed sleeve; one end of the second connecting rod away from the first connecting rod is movably connected to the movable sleeve.

6. The auxiliary positioning device for SAR imaging according to claim 5, characterized in that: Also includes: A first connecting member is fixed to the fixing sleeve and is movably connected to an end of the first connecting rod away from the corner reflector; A second connecting member is fixed to the first connecting rod and movably connected to one end of the second connecting rod; The third connecting member is fixed to the movable sleeve and is movably connected to an end of the second connecting rod away from the first connecting rod.

7. The auxiliary positioning device for SAR imaging according to claim 5, characterized in that: Also includes: A first plug-in hole is provided on the mobile sleeve; A plurality of second plug holes are all formed on the support shaft and arranged along the axial direction of the support shaft; The plug-in component is plugged into the first plug-in hole and the corresponding second plug-in hole.

8. The auxiliary positioning device for SAR imaging according to claim 7, characterized in that: Connectors, including: Hold the pole; The plug-in rod is connected to the holding rod and plugged into the first plug-in hole and the corresponding second plug-in hole.

9. The auxiliary positioning device for SAR imaging according to any one of claims 1 to 4, characterized in that: Also includes: A plurality of pitch angle scales are arranged on the surface of the support shaft along the axial direction; The pitch angle scale corresponds to the pitch angle of the corner reflector.

10. The auxiliary positioning device for SAR imaging according to claim 9, characterized in that: The elevation scale ranges from 20° to 70°.

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