In-medium passive scaler for radar perspective detection and calibration method

Abstract

The invention relates to the technical field of radar testing, and provides an in-medium passive scaler for radar perspective detection and a calibration method. The passive calibrator comprises a calibration piece, a connecting rod and a hanging ring, the calibration part is configured to be arranged in the penetrating medium and comprises a mounting seat and a plurality of reflecting plates, the plurality of reflecting plates are circumferentially arranged along the central axis of the mounting seat, one ends of the plurality of reflecting plates are connected at the central axis, and a reflecting surface is formed between every two adjacent reflecting plates; two ends of the connecting rod are respectively connected with the two calibration parts; the two hanging rings are arranged at the ends, away from the connecting rod, of the two calibration pieces correspondingly. According to the in-medium passive scaler for radar perspective detection, the influence of surface scattering on a calibration result is avoided, radar signals reflected by the scaler can be collected in an omnibearing mode, the in-medium perspective detection resolution of a radar detection system can be verified, and the comprehensive functions of calibration and radar resolution verification are achieved.

Description

Technical Field

[0001] The present invention relates to the field of radar testing technology, and in particular to an in-medium passive calibrator and a calibration method for radar perspective detection. Background Art

[0002] Radar detection is widely used in atmospheric, ocean, and land exploration. During radar detection activities, radar calibrators are often used to calibrate the radar detection system's errors. In practical applications, the radar calibrator is stably placed at a specific spatial coordinate, and its orientation is adjusted to ensure maximum reflection of radar signals from certain incident directions. When the radar moves relative to the calibrator until the beam angle covers the calibrator's area, and the connection between the radar and the calibrator meets certain geometric conditions, the vast majority of the energy of the electromagnetic wave incident on the calibrator will be backscattered back to the radar detection system, where it will be received by the radar system's receiving antenna.

[0003] For some special solid or liquid media, although radar waves experience losses during propagation within the medium, the electromagnetic signal that transmits the radar wave and reflects back to the receiving antenna retains a significant amount of energy, enabling a radar detection system with a certain frequency to perform perspective detection of the structure within the medium. However, when performing perspective detection of radar-permeable media, such as mountain glaciers or polar glaciers, the wide range of azimuth angles connecting the radar perspective detection payload and the calibrator, the limited azimuth angles of conventional passive calibrators, and the superposition of scattered signals from the medium's surface make radar signal calibration difficult, even with a calibrator placed on the glacier surface, making accurate calibration impossible. Summary of the Invention

[0004] The present invention provides a passive calibrator in a medium for radar perspective detection and a calibration method, which are used to solve the problem in the prior art that it is difficult to accurately calibrate a radar that penetrates a medium.

[0005] In order to solve the above technical problems, this application is implemented as follows: In a first aspect, the present invention provides a passive calibrator in a medium for radar perspective detection, comprising: a calibrator configured to be disposed within a penetrating medium, comprising a mounting seat and a reflector, wherein a plurality of reflectors are provided, the plurality of reflectors are circumferentially arranged along a central axis of the mounting seat, and one end of the plurality of reflectors are connected at the central axis, forming a reflective surface between two adjacent reflectors; Connecting rod, two of the said scaling parts are provided, and both ends of the said connecting rod are respectively connected to the two said scaling parts; There are two lifting rings, and the two lifting rings are respectively arranged at one end of the two calibration parts away from the connecting rod.

[0006] According to the present invention, a passive calibrator in a medium for radar perspective detection is provided, wherein the calibrating member, the connecting rod and the hanging ring constitute a calibrator unit, and the calibrator unit is provided with a plurality of groups; The passive scaler further comprises: a traction rope; At least one traction rope is provided, and the traction rope connects the plurality of calibrator units in sequence.

[0007] According to the in-medium passive calibrator for radar perspective detection provided by the present invention, the plurality of reflective plates are evenly arranged circumferentially along the central axis of the mounting base.

[0008] According to the in-medium passive calibrator for radar perspective detection provided by the present invention, the reflecting plate is any one of a rectangular plate, a triangular plate or a quarter-circular arc plate.

[0009] According to the in-medium passive calibrator for radar perspective detection provided by the present invention, the length of the connecting rod has multiple specifications, and the length of the passive calibrator corresponding to the connecting rods of different specifications matches the resolution of the radar.

[0010] According to the in-medium passive calibrator for radar perspective detection provided by the present invention, the mounting seat is a circular structure, and the mounting seat is provided with multiple specifications, and the diameters of the mounting seats of different specifications are different.

[0011] According to the in-medium passive calibrator for radar perspective detection provided by the present invention, a chamfer is provided on a side of the mounting seat facing away from the reflector.

[0012] According to the passive in-medium calibrator for radar perspective detection provided by the present invention, both ends of the connecting rod are provided with external threads, both sides of the calibrating piece are provided with threaded holes, and the connecting rod is threadedly connected to the calibrating piece.

[0013] According to the present invention, a passive in-medium calibrator for radar perspective detection is provided, wherein the calibrating component is an aluminum alloy component.

[0014] In a second aspect, the present invention provides a method for radar calibration using the passive calibrator as described above, comprising: Determine the location and depth of the probe hole for the medium to be tested, and construct a probe hole at the probe hole location; determining a scaler length and a number of scaler units, and assembling a plurality of the determined number of scaler units into a passive scaler; Use the suspension method to lower the passive calibrator along the exploration hole to the specified depth and fix it; The electromagnetic waves reflected by the passive calibrator are obtained to calibrate the error of the radar under test and verify the resolution of the radar under test.

[0015] The present invention provides an in-medium passive calibrator and calibration method for radar perspective detection. By configuring a calibrating component to be located within a penetrating medium, the calibrator can reflect radar signals propagating within the medium, thereby avoiding the influence of radar scattering signals generated on the medium surface on the calibration results. In addition, multiple reflective plates are arranged circumferentially along the central axis of the mounting base to circumferentially reflect radar waves, so that the radar signals reflected by the calibrator can be collected in all directions. By selecting a connecting rod that matches the radar resolution and forming the connecting rod and two calibrating components into a rigid assembly, the in-medium perspective detection resolution of the radar detection system can be verified, thereby realizing the combined functions of calibration and radar resolution verification. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is the schematic diagram of the radar calibrator backscattering principle.

[0018] Figure 2 It is a schematic diagram of the calibrator unit provided by the present invention.

[0019] Figure 3 It is a schematic diagram of the installation of the passive calibrator provided by the present invention.

[0020] Figure 4 The figure is a flow chart of a method for radar calibration using a passive calibrator provided by the present invention.

[0021] Reference numerals: 1. Calibrator unit; 11. Calibration piece; 12. Connecting rod; 13. Lifting ring; 111. Mounting base; 112. Reflector; 2. Towing rope; 100. Exploration hole. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0023] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of explaining the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0024] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on specific circumstances.

[0025] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0026] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0027] The following combination Figures 1 to 4The passive in-medium calibrator and calibration method for radar perspective detection provided by the embodiments of the present invention are described in detail through specific embodiments and application scenarios.

[0028] First, as Figure 2 As shown, this embodiment provides an in-medium passive calibrator for radar perspective detection, including: a calibration member 11, a connecting rod 12 and a hanging ring 13.

[0029] The calibration component 11 is configured to be placed inside the penetrating medium, and includes a mounting seat 111 and a reflective plate 112. There are multiple reflective plates 112, and the multiple reflective plates 112 are arranged circumferentially along the central axis of the mounting seat 111. One ends of the multiple reflective plates 112 are connected at the central axis, and a reflective surface is formed between two adjacent reflective plates 112.

[0030] There are two calibration members 11 , and both ends of the connecting rod 12 are connected to the two calibration members 11 respectively.

[0031] There are two hanging rings 13 , which are respectively arranged at one end of the two calibration members 11 away from the connecting rod 12 .

[0032] It is understandable that Figure 1 This is a schematic diagram of the backscattering principle of a passive calibrator. As can be seen from the figure, the passive calibrator can reflect radar signals, allowing the calibrator's reflected signal to be received by the radar receiving antenna. This allows the radar detection system's measurement error to be calibrated based on information such as the medium parameters and the geometric position of the calibrator and the radar system. In radar system perspective detection tasks, when electromagnetic waves emitted by the radar propagate through different media, factors such as the dielectric and conductivity properties of the different media will change the propagation speed and attenuation characteristics of the electromagnetic wave signal. Therefore, calibration of radars for different application scenarios requires placing the calibrator in the specific application scenario for measurement. For glacier detection or similar radar detection scenarios involving penetrating media, the scattering signals from the glacier surface, the surrounding mountains, and the ice-rock interface are all relatively strong. However, due to the relatively small changes in local physical properties within the glacier, the electromagnetic scattering generated is not significant. Therefore, the passive calibrator of this embodiment is placed inside the glacier. The calibrator does not need to be placed on the surface of the penetrating medium, which maximizes the guarantee that the calibrator's scattering signal will not be mixed with the surface scattering signal of the penetrating medium, thereby ensuring the accuracy of the calibration of penetrating medium radar detection.

[0033] The mounting base 111 of this embodiment provides a mounting support for multiple reflectors 112. Since the multiple reflectors 112 are arranged circumferentially along the central axis of the mounting base 111, one end of the multiple reflectors 112 is connected to the central axis, and the other ends of the multiple reflectors 112 face the outside of the mounting base 111 and are arranged circumferentially along the mounting base 111. A reflective surface is formed between two adjacent reflectors 112, and the reflective surface is used to reflect the electromagnetic waves emitted by the detection radar. Since the reflective surface is also arranged circumferentially along the central axis, the passive calibrator of this embodiment can reflect electromagnetic waves incident from multiple directions, that is, the calibrator can collect electromagnetic waves incident from all directions and respond to electromagnetic waves from all directions. For radar calibration in scenes with harsh penetrating media such as glaciers, the calibrator is placed in a probe hole 100 within the glacier. Its circumferential reflection characteristics make it possible to reflect radar signals from multiple directions and angles without adjusting geometric parameters such as the spatial position of the calibrator during the calibration process, reducing the difficulty of radar signal calibration and enhancing the convenience of radar calibration.

[0034] The calibrator of this embodiment includes two calibrating members 11 and a connecting rod 12. The two calibrating members 11 are arranged at both ends of the connecting rod 12. Compared with a single calibrating member 11, the two calibrating members 11 can provide more reflective surfaces within a certain length, thereby collecting more data points for calibration calculations, resulting in better calibration results for radars of a certain length. Furthermore, because the connecting rod 12 is rigid during the calibration test, the length of the calibrator remains unchanged, and the calibrator can also be used to verify the radar resolution in this application scenario. By selecting the length of the connecting rod 12 so that the length of the entire calibrator matches the length corresponding to the radar resolution, the radar's detection resolution index can be verified by finely imaging the calibrator using the acquired calibrator reflection signal.

[0035] Since the passive calibrator is intended to be placed inside a penetrating medium, a calibration test requires first constructing a probe hole 100 inside the penetrating medium and placing the calibrator inside the probe hole 100. In this embodiment, a lifting ring 13 is provided at one end of the calibrator 11 for lifting the calibrator into the probe hole 100.

[0036] The in-medium passive calibrator for radar perspective detection provided by the present invention configures the calibrating component 11 to be located inside the penetrating medium so that the calibrator can reflect radar signals propagating in the medium, thereby avoiding the influence of radar scattering signals generated on the medium surface on the calibration results. In addition, multiple reflective plates 112 are arranged circumferentially along the central axis of the mounting seat 111 to circumferentially reflect radar waves, so that the radar signals reflected by the calibrator can be collected in all directions. By selecting a connecting rod 12 that matches the radar resolution and forming the connecting rod 12 and two calibrating components 11 into a rigid assembly, the in-medium perspective detection resolution of the radar detection system can be verified, thereby realizing the combined functions of calibration and verification of radar resolution.

[0037] like Figure 2 and Figure 3 As shown, the calibration member 11, the connecting rod 12 and the hanging ring 13 of this embodiment constitute the calibration unit 1, and the calibration unit 1 is provided in multiple groups.

[0038] The passive calibrator further includes: a traction rope 2; at least one traction rope 2 is provided, and the traction rope 2 connects the multiple calibrator units 1 in sequence.

[0039] It is understood that a calibrator unit 1 includes a connecting rod 12 and two calibrators 11 located at both ends of the connecting rod 12. Adjacent calibrators 1 are connected by a traction rope 2, which is installed on a lifting ring 13 to facilitate the rapid connection of multiple calibrators 1 on site.

[0040] Specifically, one traction rope 2 is provided, and two ends of the traction rope 2 are connected to two calibrator units 1. Multiple traction ropes 2 are provided, and multiple traction ropes 2 are respectively connected to different calibrator units 1. Multiple calibrator units 1 are connected in sequence to form a longer calibrator.

[0041] like Figure 3 As shown, L1 is the length of a scaler unit 1, L2 is the distance between the same positions of two sets of scaler units 1, L2-L1 is the length of the traction rope 2. D2 is the diameter of the scaler, and D1 is the diameter of the exploration hole.

[0042] When drilling 100 within a glacier or ice layer, the dielectric constant and conductivity of the ice layer vary at different depths, resulting in different radar calibration parameters at different depths. Therefore, multiple calibrator units 1 are required to be placed at different depths to collect data on electromagnetic wave reflections. Therefore, this embodiment utilizes multiple sets of calibrator units 1 to form a passive calibrator. These multiple sets of calibrator units 1 independently reflect and collect electromagnetic waves emitted by radars at different depths, obtaining different calibration parameters and improving the calibration capability of the calibrator.

[0043] like Figure 1As shown, the multiple reflective plates 112 of this embodiment are evenly arranged along the circumference of the central axis of the mounting base 111.

[0044] It can be understood that the uniform circumferential arrangement of multiple reflectors 112 enables the reflective surface along the central axis of the mounting base 111 to be evenly arranged circumferentially, forming a three-dimensional, uniform reflective surface over a 360-degree range. This evenly spaced reflector reflects the test radar's electromagnetic waves, providing consistent reflection performance in all directions, enhancing the omnidirectional signal of the reflected electromagnetic waves and avoiding target recognition errors caused by radar cross-section. Furthermore, the uniform circumferential arrangement allows the same reflectors 112 to be reused, reducing design complexity and facilitating mass production and assembly.

[0045] Specifically, in this embodiment, four reflective plates 112 are provided, and the angles between the four reflective plates 112 are all 90°.

[0046] like Figure 2 As shown, the reflective plate 112 of this embodiment is any one of a rectangular plate, a triangular plate or a quarter arc plate.

[0047] It is understandable that when the reflective plate 112 is a rectangular plate, one wide side of the rectangular plate is connected at the central axis of the mounting base 111, and the other wide side extends toward the outside of the mounting base 111 to form a rectangular reflective surface.

[0048] Alternatively, when the reflector 112 is a triangular plate, one right-angled side of the triangular plate is connected at the central axis of the mounting base 111, and the other right-angled side extends toward the outside of the mounting base 111 to form a triangular reflective surface.

[0049] Alternatively, when the reflector 112 is a quarter arc plate, one straight side of the arc plate is connected to the central axis of the mounting base 111, and the other straight side extends toward the outside of the mounting base 111 to form an arc-shaped reflective surface.

[0050] like Figure 2 As shown, the length of the connecting rod 12 of this embodiment has various specifications, and the length of the passive calibrator corresponding to the connecting rod 12 of different specifications matches the resolution of the radar.

[0051] It is understood that different detection radars, or even different operating modes of the same radar, have different resolutions. To ensure that the length of the passive scaler matches the radar resolution, the connecting rod 12 of this embodiment has various length specifications. Connecting rods 12 of different specifications have different lengths, ensuring that the length of the assembled scaler matches the specific radar resolution.

[0052] When testing signal errors of different detection radars, or the same radar under different operating modes, connecting rods 12 of varying lengths can be assembled to form a calibrator. The calibrating element 11 can be manufactured as a standard component, and by assembling connecting rods 12 of varying specifications, calibrators corresponding to different resolutions can be obtained. In practical applications, the specifications of the connecting rods 12 can be flexibly selected based on on-site conditions, eliminating the need for on-site temporary processing. This improves the efficiency of assembling the calibrator and increases its universality.

[0053] like Figure 2 and Figure 3 As shown, the mounting seat 111 of this embodiment is a circular structure. The mounting seat 111 is provided in various specifications, and the diameters of the mounting seats 111 of different specifications are different.

[0054] It is understood that the diameter of mounting base 111 needs to be smaller than the diameter of manhole 100. To ensure the proper installation of mounting base 111 within manhole 100, the diameter of mounting base 111 should not differ significantly from the diameter of manhole 100. To accommodate different manhole 100 sizes, mounting base 111 is available in various sizes, with mounting bases 111 of varying sizes corresponding to manholes 100. During field operations, a mounting base 111 with a diameter smaller than, but not significantly different from, the diameter of manhole 100 is selected based on the diameter of manhole 100. Mounting base 111 can be lowered from the top of manhole 100 into the glacier using a tow rope 2.

[0055] This embodiment provides mounting seats 111 of different specifications, which can be flexibly selected according to the size of the exploration hole 100 on site. There is no need to process the mounting seats 111 on site, which improves the installation efficiency on site.

[0056] like Figure 2 As shown, a chamfer is provided on the side of the mounting base 111 facing away from the reflector 112 in this embodiment.

[0057] It is understandable that when the mounting seat 111 is lowered from the exploration hole 100, a chamfer is provided on one end of the mounting seat 111 facing the bottom of the exploration hole 100, which can facilitate the lowering process of the mounting seat 111 and avoid the mounting seat 111 and the inner wall of the exploration hole 100 from being pulled and affecting the correct placement position of the calibrator.

[0058] like Figure 2 As shown, both ends of the connecting rod 12 of this embodiment are provided with external threads, and threaded holes are provided on both sides of the scaling member 11, and the connecting rod 12 is threadedly connected to the scaling member 11.

[0059] As will be appreciated, since the connecting rod 12 and the calibration member 11 can be assembled on-site, the ends of the connecting rod 12 and the calibration member 11 are threaded together, enabling rapid assembly and disassembly. Furthermore, since the connecting rod 12 and the calibration member 11 are available in different specifications, the appropriate connecting rod 12 and calibration member 11 can be selected on-site based on the size of the borehole 100 and the radar resolution, and the threaded connection allows for rapid assembly. This improves on-site assembly efficiency and enables the connection of connecting rods 12 and calibration members 11 of varying specifications.

[0060] like Figure 2 As shown, the calibration member 11 of this embodiment is a member made of a material that can effectively reflect radar waves. Specifically, the calibration member 11 is an aluminum alloy member.

[0061] Second, as Figure 4 As shown, this embodiment provides a method for radar calibration using the above passive calibrator, including the following steps: Step 411 : determining the probe hole position and probe hole depth of the medium to be tested, and constructing the probe hole 100 at the probe hole position.

[0062] It can be understood that the penetrating medium in this embodiment includes various media that can penetrate electromagnetic waves emitted by the radar, and a glacier is used as an example for illustration.

[0063] After measuring and analyzing the glacier data, the location of the probe hole 100 to be measured in the penetrating medium is determined, along with its depth and diameter. A drilling device is then used to drill the probe hole 100 along the depth of the glacier. Because the radar calibration method in this embodiment utilizes a calibration element 11 placed within the penetrating medium, it reflects electromagnetic waves within the medium, avoiding the effects of scattering from the glacier surface and improving calibration accuracy. Furthermore, drilling can be completed in an appropriate location, avoiding long hours of work in the harsh environment of the glacier's top, and enhancing the operator experience.

[0064] Step 412 : Determine the length of the scaler and the number of scaler units 1 , and assemble the determined number of scaler units 1 into a passive scaler.

[0065] It will be appreciated that the number and spacing of the calibrators are selected based on the determined depth of the borehole 100. For example, a calibrator may be placed at a predetermined depth. Furthermore, the number of calibrator units 1 within each calibrator is determined, and the corresponding connecting rod 12 specifications are selected based on the resolution of the detection radar, and the corresponding mounting base 111 is selected based on the diameter of the borehole 100. The calibrator unit 1 is assembled with the calibrator 11 and connecting rod 12. Multiple calibrator units 1 are sequentially connected via a traction rope 2 to form the calibrator.

[0066] Step 413 : Use a suspension method to lower the passive calibrator along the exploration hole 100 to a specified depth and fix it.

[0067] It is understandable that the installation of the passive calibrator is completed by using a winch to place the calibrator into a preset position in the manhole 100 .

[0068] Step 414: Acquire the electromagnetic wave reflected by the passive calibrator, calibrate the error of the radar to be tested, and verify the resolution of the radar to be tested.

[0069] It can be understood that the calibration test of the passive calibrator is carried out by starting the radar to transmit electromagnetic waves, obtaining the electromagnetic waves reflected by the passive calibrator detected by the radar in the circumferential direction along the depth direction of the exploration hole 100, and calibrating the signal error of the radar to be tested.

[0070] At the same time, according to the signals transmitted and received by the radar under test, the echoes of the two calibration components 11 of the passive calibrator are recorded, and fine imaging of the calibration components 11 is performed to verify the resolution performance of the radar under test.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A passive calibrator in a medium for radar perspective detection, characterized in that: include: The calibration member is configured to be disposed inside the penetrable medium, and includes a mounting seat and a reflective plate, wherein a plurality of the reflective plates are provided, the plurality of reflective plates are arranged circumferentially along the central axis of the mounting seat, and one end of the plurality of reflective plates are connected at the central axis, and a reflective surface is formed between two adjacent reflective plates; Connecting rod, two of the said scaling parts are provided, and both ends of the said connecting rod are respectively connected to the two said scaling parts; There are two lifting rings, and the two lifting rings are respectively arranged at one end of the two calibration parts away from the connecting rod.

2. The passive in-medium calibrator for radar perspective detection according to claim 1, characterized in that: The calibration member, the connecting rod and the lifting ring constitute a calibration unit, and the calibration unit is provided in multiple groups; The passive scaler further comprises: a traction rope; At least one traction rope is provided, and the traction rope connects the plurality of calibrator units in sequence.

3. The passive in-medium calibrator for radar perspective detection according to claim 1, characterized in that: The plurality of reflective plates are evenly arranged circumferentially along the central axis of the mounting base.

4. The passive in-medium calibrator for radar perspective detection according to claim 1, characterized in that: The reflective plate is any one of a rectangular plate, a triangular plate or a quarter circular plate.

5. The passive in-medium calibrator for radar perspective detection according to claim 1, characterized in that: The length of the connecting rod has various specifications, and the length of the passive calibrator corresponding to the connecting rods of different specifications matches the resolution of the radar.

6. The passive in-medium calibrator for radar perspective detection according to claim 1, characterized in that: The mounting seat is a circular structure and is provided in a variety of specifications. The mounting seats of different specifications have different diameters.

7. The passive in-medium calibrator for radar perspective detection according to any one of claims 1 to 6, characterized in that: A chamfer is provided on a side of the mounting seat facing away from the reflector plate.

8. The passive in-medium calibrator for radar perspective detection according to any one of claims 1 to 6, characterized in that: Both ends of the connecting rod are provided with external threads, and both sides of the calibration piece are provided with threaded holes, and the connecting rod is threadedly connected to the calibration piece.

9. The passive in-medium calibrator for radar perspective detection according to claim 1, characterized in that: The calibration part is an aluminum alloy part.

10. A method for radar calibration using the passive calibrator according to any one of claims 1 to 9, characterized in that: include: Determine the location and depth of the probe hole for the medium to be tested, and construct a probe hole at the probe hole location; determining a scaler length and a number of scaler units, and assembling a plurality of the determined number of scaler units into a passive scaler; Use the suspension method to lower the passive calibrator along the exploration hole to the specified depth and fix it; The electromagnetic waves reflected by the passive calibrator are obtained to calibrate the error of the radar under test and verify the resolution of the radar under test.

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