Method and system for positioning using a homogeneous magnetic field with bic mode

Abstract

The application relates to the technical field of positioning, in particular to a method and system for positioning by using a BIC mode to realize a uniform magnetic field, which comprises the following steps: placing a coupling unit on a device to be positioned; placing a detection antenna on a parking platform; transmitting an excitation signal to a metal excitation ring on the detection antenna by using an excitation source, and then a magnetic dipole formed by annular current on the metal excitation ring excites a BIC mode in a metal opening resonant ring array on the detection antenna; corresponding detection ports are arranged at each metal opening resonant ring; when the device to be positioned is located on the parking platform, the position information of the coupling unit on the device to be positioned is obtained by detecting the change of induced voltage formed at each detection port in real time, so that the positioning is completed. The application realizes global and high-stability magnetic field excitation, can effectively make up for the short board of the prior art, and can adapt to the needs of close-range positioning and fixed-point parking of various self-intelligent devices.

Description

Technical Field

[0001] This invention relates to the field of positioning technology, and specifically to a method and system for positioning using a uniform magnetic field achieved by utilizing the BIC mode. Background Technology

[0002] With the development of artificial intelligence and the Internet of Things (IoT) technologies, autonomous intelligent equipment such as drones and AGVs are being used more and more widely. Positioning accuracy, response speed, and environmental adaptability have become core requirements, especially in enclosed, obstructed, and complex electromagnetic environments, where positioning reliability directly determines the safety of equipment operation. Currently, mainstream positioning technologies all have significant limitations: satellite positioning is susceptible to interference from obstructions, inertial navigation suffers from cumulative errors, and ultrasonic and infrared positioning have weak resistance to environmental interference, all of which are insufficient to meet the requirements for accurate short-range positioning. Therefore, solutions for short-range positioning need improvement. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method and system for positioning using a uniform magnetic field based on the BIC mode. This solves the problems that existing satellite positioning is susceptible to interference from obstructions, inertial navigation has cumulative errors, and ultrasonic and infrared positioning have weak resistance to environmental interference, all of which are difficult to meet the requirements for accurate short-range positioning.

[0004] The technical solution to achieve the above objectives is:

[0005] This invention provides a method for positioning using a uniform magnetic field based on the BIC mode, comprising the following steps:

[0006] Provide a coupling unit, and place the provided coupling unit on the device to be positioned;

[0007] A detection antenna is provided, which includes a printed circuit board, a plurality of metal open resonant rings periodically arranged on the front side of the printed circuit board, and a metal excitation ring located at the center of the back side of the printed circuit board. Each metal open resonant ring is connected to a lumped capacitor. The provided detection antenna is placed on a parking platform.

[0008] An excitation source is provided and connected to the metal excitation ring. The excitation signal is transmitted to the metal excitation ring using the provided excitation source, and then the magnetic dipole formed by the ring current on the metal excitation ring excites the BIC mode in the metal open resonant ring of the array.

[0009] A corresponding detection port is set at each metal open resonant ring, and the position of each detection port is calibrated.

[0010] When the device to be located is on the parking platform, the position information of the coupling unit on the device to be located is obtained by real-time detection of the changes in the induced voltage at each detection port and combined with the calibrated position of the detection port, thereby completing the positioning.

[0011] A further improvement of the method for positioning using a uniform magnetic field with BIC mode in this invention is that the excitation source provides an excitation signal of a specific frequency to the metal excitation ring, wherein the specific frequency is the resonant frequency of the metal open resonant ring or a frequency value near it.

[0012] A further improvement of the method for positioning using a uniform magnetic field based on the BIC mode in this invention is that multiple metal open resonant rings are arranged periodically on the front side of the printed circuit board in a mirror-symmetric or rotationally symmetric manner.

[0013] A further improvement of the method for positioning using a uniform magnetic field based on the BIC mode in this invention is that the geometric parameters of each metal open-ring resonator are consistent, and the capacitance values ​​of the lumped capacitors connected to each metal open-ring resonator are equal.

[0014] A further improvement of the method for positioning using a uniform magnetic field based on the BIC mode in this invention is that multiple detection antennas are provided, and an array of multiple detection antennas is set on the parking platform to cover the area of ​​the parking platform.

[0015] This invention also provides a system for positioning using a uniform magnetic field based on BIC mode, comprising:

[0016] The coupling unit is located on the device to be positioned.

[0017] A detection antenna is mounted on a parking platform. The detection antenna includes a printed circuit board, a plurality of metal open resonant rings periodically arranged on the front side of the printed circuit board, and a metal excitation ring located at the center of the back side of the printed circuit board. Each metal open resonant ring is connected to a lumped capacitor.

[0018] An excitation source is connected to the metal excitation ring. The excitation source is used to transmit an excitation signal to the metal excitation ring, and then the magnetic dipole formed by the ring current on the metal excitation ring excites the BIC mode in the array of the metal open resonant ring.

[0019] Multiple detection ports are located at each metal-opening resonant ring on the front side of the printed circuit board;

[0020] A detection circuit connected to each detection port, the detection circuit being used to detect the induced voltage formed at each detection port in real time;

[0021] The processing module connected to the detection circuit is used to obtain the position information of the coupling unit on the device to be positioned by means of the change in induced voltage detected by the detection circuit and the calibration position of the detection port when the device to be positioned is located on the parking platform, thereby completing the positioning.

[0022] A further improvement of the system for positioning using a uniform magnetic field in the present invention is that the excitation source provides an excitation signal of a specific frequency to the metal excitation ring, wherein the specific frequency is the resonant frequency of the metal open resonant ring or a frequency value near it.

[0023] A further improvement of the system for positioning using a uniform magnetic field in the present invention is that multiple metal open resonant rings are arranged periodically on the front side of the printed circuit board in a mirror-symmetric or rotationally symmetric manner.

[0024] A further improvement of the system for positioning using a uniform magnetic field based on the BIC mode in this invention is that the geometric parameters of each metal open resonator are consistent, and the capacitance values ​​of the lumped capacitors connected to each metal open resonator are equal.

[0025] A further improvement of the system for positioning using a uniform magnetic field in the present invention is that there are multiple detection antennas, and the array of multiple detection antennas is arranged on the parking platform to cover the area of ​​the parking platform.

[0026] The beneficial effects of the method and system for positioning using a uniform magnetic field based on the BIC mode of this invention are as follows:

[0027] The positioning method and system of the present invention utilize the core characteristics of BIC (Bound states in the continuum) mode, which has an extremely high quality factor, uniform magnetic field distribution, and non-locality, to achieve global and highly stable magnetic field excitation. This effectively makes up for the shortcomings of existing technologies and can be adapted to the short-range positioning and fixed-point docking needs of various autonomous intelligent devices. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a preferred embodiment of the detection antenna in the method and system for positioning using a uniform magnetic field with BIC mode according to the present invention. (a) is a schematic diagram of the front structure of the printed circuit board, (b) is a partially enlarged schematic diagram of the front of the printed circuit board, and (c) is a schematic diagram of the structure of the metal excitation ring on the back of the printed circuit board.

[0029] Figure 2 This invention relates to a method for positioning using a uniform magnetic field in BIC mode and a uniform magnetic field distribution diagram in BIC mode within the system.

[0030] Figure 3 This invention relates to a method for positioning using a uniform magnetic field in BIC mode, and a diagram illustrating the detection effect of the device to be positioned appearing in a uniform magnetic field under BIC mode within the system.

[0031] Figure 4 This is a framework diagram of the system for positioning using a uniform magnetic field based on the BIC mode, as described in this invention.

[0032] Figure 5 This is a schematic diagram of the method and system for positioning using a uniform magnetic field based on the BIC mode, as described in this invention, for use in UAV parking and positioning.

[0033] Figure 6 This is a schematic diagram of the detection antenna used by the method and system of BIC mode to realize the location identification of the device to be located. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0035] See Figure 1 This invention provides a method and system for positioning using a uniform magnetic field based on the BIC mode. Leveraging the advantages of the BIC mode, it achieves precise positioning with uniformity across the entire area, high sensitivity, and low cost, adapting to the close-range positioning and vertex docking requirements of various autonomous intelligent devices. The method and system for positioning using a uniform magnetic field based on the BIC mode of this invention will be described below with reference to the accompanying drawings.

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0037] A system for positioning using a uniform magnetic field in BIC mode according to the present invention includes a coupling unit, a detection antenna, an excitation source, multiple detection ports, a detection circuit, and a processing module. The coupling unit is disposed on the device to be positioned; the detection antenna is disposed on a parking platform, which is the platform on which the device to be positioned is parked or placed. That is, when the device to be positioned is located on the parking platform, it can be located using the detection antenna. Figure 1As shown, the detection antenna includes a printed circuit board 21, multiple metal open-loop resonant rings 22 periodically arranged on the front side of the printed circuit board 21, and a metal excitation ring 23 located at the center of the back side of the printed circuit board 21. Each metal open-loop resonant ring 22 is connected to a lumped capacitor. An excitation source is connected to the metal excitation ring 23 and is used to transmit an excitation signal to the metal excitation ring 23. The magnetic dipole formed by the ring current on the metal excitation ring 23 then excites the BIC mode in the array of metal open-loop resonant rings 22. Detection ports are located at each metal open-loop resonant ring 22 on the front side of the printed circuit board 21. A detection circuit is connected to each detection port and is used to detect the induced voltage formed at each detection port in real time. A processing module is connected to the detection circuit and is used to obtain the position information of the coupling unit on the device to be located by combining the change of induced voltage detected by the detection circuit with the calibration position of the detection port when the device to be located is on the parking platform, thereby completing the positioning.

[0038] Preferably, the number of detection ports is consistent with the number of metal open resonant rings 22 set on the detection antenna. Each detection port is preferably located in the inner region of the corresponding metal open resonant ring 22. This detection port is a high-impedance detection port, and by utilizing its high impedance characteristics, it will not affect the magnetic field distribution in the system.

[0039] Furthermore, the coupling unit set on the device to be located cannot be a high-impedance unit. It can be a resonant unit, such as an LC circuit, or a non-resonant unit, such as a metal ring, metal block, or other metal structure, or a magnetic material structure. The coupling unit must have a certain effective impedance in order to disrupt the uniform magnetic field in the BIC mode and thus be detected.

[0040] In one specific embodiment of the present invention, an excitation signal of a specific frequency is provided by an excitation source to a metal excitation ring 23, wherein the specific frequency is the resonant frequency of the metal open resonant ring 22 or a frequency value near it.

[0041] The frequency of the excitation signal provided by the excitation source is the resonant frequency of the metal open resonant ring 22 or a frequency value near it, which enables the system to form a non-radiative uniform magnetic field local mode.

[0042] In one specific embodiment of the present invention, a plurality of metal open resonant rings 22 are arranged periodically on the front side of the printed circuit board 21 in a mirror-symmetric or rotationally symmetric manner.

[0043] Specifically, on the front side of the printed circuit board 21, the spacing between the horizontally or diagonally arranged metal open-circuit resonator rings 22 in the same row is equal. The material and size of each metal open-circuit resonator ring 22 are consistent. The material of the metal open-circuit resonator ring 22 is copper. The size, line width, and period length of the metal open-circuit resonator ring 22 can be designed according to the actual testing requirements. The size selection can be determined based on the required positioning accuracy. For example, the outer diameter of the metal open-circuit resonator ring 22 can be set to 13mm, the line width to 1.5mm, and the period length (i.e., the center distance between two adjacent metal open-circuit resonator rings 22) to 13.5mm. The opening direction of each metal open-circuit resonator ring 22 is consistent, all facing downwards. Preferably, the metal open-circuit resonator ring 22 can be made by etching copper foil with a thickness of 1oz.

[0044] Furthermore, such as Figure 1 As shown, one row of metal open resonant rings 22 in the two adjacent rows of metal open resonant rings 22 is positioned at the middle position of two adjacent metal open resonant rings 22 in the other row of metal open resonant rings 22, so that the outer contours of the three metal open resonant rings 22 form an isosceles triangle.

[0045] In another preferred embodiment, the outer contour of the printed circuit board 21 is square, and the metal open-circuit resonant rings 22 arrayed on the printed circuit board 21 are equally spaced, with the metal open-circuit resonant rings 22 in two adjacent rows arranged aligned with each other. Preferably, the spacing between the metal open-circuit resonant rings 22 is less than or equal to 0.5 mm.

[0046] Furthermore, the geometric parameters of each metal open-circuit resonator 22 are identical, and the capacitance value of the lumped capacitor connected to each metal open-circuit resonator 22 is equal. Preferably, the lumped capacitor is connected in series at the opening of the corresponding metal open-circuit resonator 22.

[0047] Furthermore, the size of the metal excitation ring 23 can be set according to the actual detection requirements. Specifically, it can be set according to the size of the foreign object to be detected. For example, the outer diameter of the metal excitation ring 23 can be set to 6mm, and the material of the metal excitation ring 23 can be copper. The thickness of the printed circuit board 21 can be set according to actual requirements. For example, the thickness of the printed circuit board 21 can be set to 1mm.

[0048] In one specific embodiment of the present invention, there are multiple detection antennas, and the array of multiple detection antennas is arranged on the parking platform to cover the area of ​​the parking platform.

[0049] In one specific embodiment of the present invention, the excitation source transmits an excitation signal of a specific frequency to the metal excitation ring 23 through an excitation circuit. The magnetic dipole formed by the ring current excites a BIC mode in the array of the metal open resonant ring 22. The magnetic field distribution in this mode has a high degree of uniformity, such as... Figure 2 As shown, at this time, each high-impedance detection port on the front of the printed circuit board generates an induced voltage under the action of the magnetic field. The analog quantity of this induced voltage is transmitted back to the detection circuit. The microcontroller in the detection circuit converts the analog voltage into a digital quantity and records it as the standard value of the system when it is working without a device to be positioned.

[0050] like Figure 3 As shown, when the device to be positioned appears on the parking platform, the coupling unit set on the device to be positioned couples with the uniform magnetic field in BIC mode, the uniform magnetic field distribution is destroyed, the field strength in the detection area changes, the induced voltage on the corresponding detection port changes, and when the detection circuit detects that the induced voltage is different from the voltage value in the state without the device to be positioned, it determines that the device to be positioned is above the corresponding inspection port.

[0051] like Figure 6 The diagram shows a detection antenna with 63 resonant coils arranged in 7 rows and 9 columns (each resonant coil consists of a metal open-circuit resonant ring connected in series with a lumped capacitor). A high-impedance detection port is positioned at each resonant coil, and the 63 ports are numbered 1 to 63. The positive X-axis is defined as the rightward direction of the long side of the antenna plate, and the positive Y-axis is defined as the upward direction of the short side. The coordinates of each detection port can be determined based on the diameter of the metal open-circuit resonant ring. During operation, an excitation signal is provided to the metal excitation ring using an excitation source to generate a BIC magnetic field on the detection antenna. Each detection port can detect an induced voltage. When no object falls on the antenna, the induced voltage at each detection port remains unchanged. When the device to be located, carrying a coupling unit (the size of which is less than or equal to the size of the metal open-circuit resonant ring), falls on the antenna, it affects the magnitude of the induced voltage at the corresponding detection port. The coordinates of the device to be located are then calculated from the coordinates of the detection ports where the induced voltage changes. For example, when the drone carrying the coupling unit lands at the location of resonant unit number 9, the induced voltage at the detection port at position 9 changes. The positioning range is then the size range of position 9, and the positioning error is within the diameter range of the resonant unit. The positioning accuracy of this invention is determined by the size of the resonant unit on the detection antenna, thus allowing the size of the resonant unit to be designed according to the required positioning accuracy. If the induced voltage at multiple detection ports changes after the drone lands, the position with the largest change is used as the reference.

[0052] like Figure 4 As shown, a coupling unit is installed on the drone. After the drone arrives at the designated area, the positioning coupling unit couples with the BIC uniform magnetic field, disrupting the uniform field distribution. This causes a change in the induced voltage at the corresponding detection port. Based on the position information of the detection port, the drone's location can be determined. At this time, the detection circuit can also communicate with the circuitry on the drone, sending the drone's position information to the circuitry so that the drone can perform corresponding actions based on this position information.

[0053] like Figure 5 As shown, the positioning method and system of the present invention can be used for positioning during the parking process of a drone. After the drone lands on the parking platform, the current position of the drone can be accurately realized, ensuring that the drone can be stably parked in the designated position, avoiding positioning deviations that may cause equipment damage or safety accidents.

[0054] The working principle of the positioning system of this invention is as follows:

[0055] The detection antenna of this invention consists of a metal open-loop resonant ring array on the front of the PCB board and a metal excitation ring on the back. At a specific frequency, the magnetic dipole formed by the current in the metal excitation ring excites a BIC mode in the metal open-loop resonant ring array on the front. The quality factor can theoretically reach infinity, and in practical systems, it can be improved by orders of magnitude. The magnetic field distribution in this mode has extremely high uniformity and strong stability when there is no device to be located. Unlike the local detection in traditional methods, the magnetic field in the BIC mode is non-local, and the detection port is high impedance, so it does not affect the field distribution in the system. The coupling unit of the receiving device to be located has effective impedance, which can trigger a global field strength change, rather than just disturbing the local field strength. This global field distribution disruption effect enables large-scale, high-sensitivity detection, solving the contradiction between complexity and sensitivity in traditional coil array schemes. Therefore, no matter where the device is located on the detection antenna, the magnetic field will change drastically, enabling rapid and global location detection.

[0056] Bound states in the continuum (BIC) are a special type of wave. Generally, if an electromagnetic wave of a certain frequency is within the propagation band in space, its energy will continuously dissipate outward in the form of leakage waves, leading to a rapid decay of the overall energy. However, BIC-mode waves are an exception. They are within the propagation band, but their energy is highly localized. All leakage and coupling channels are completely prohibited. Therefore, microscopic particles in BIC mode are theoretically under extremely strong confinement and possess an infinitely large quality (Q) factor.

[0057] BIC modes have the following characteristics: ① They are more easily excited in periodic / resonant structures; ② Local excitation can form an overall field distribution in the structure; ③ The mode itself is very sensitive to disturbances. Based on these characteristics, when a device to be located, equipped with a coupling unit, intrudes into the detection area, its dielectric constant and geometric dimensions will slightly perturb the symmetry and phase-matching conditions of the BIC mode, causing the originally strictly suppressed radiation channels to partially open, the Q factor to drop sharply, and accompanied by a significant shift in the reflection spectrum or broadening of the absorption peak. By identifying this response through a monitoring system (or detection circuit), subwavelength-level positioning can be achieved.

[0058] The realization of a uniform magnetic field in BIC mode requires satisfying the dual constraints of structural symmetry and phase matching. On the one hand, the unit structure must possess structural symmetry, which can be either mirror symmetry or rotational symmetry, to strictly prohibit dipole / higher-order multipole radiation channels. On the other hand, the consistency of the structure between adjacent units must be ensured by precisely controlling geometric parameters (such as linewidth, period ratio, and coupling strength) and electromagnetic parameters (such as capacitance, inductance, and resonant frequency), so that far-field radiation undergoes complete destructive interference in the continuous spectrum. Only through the synergistic effect of these two factors can a non-radiative uniform magnetic field localized mode be formed at the operating frequency (which is the specific frequency of the excitation signal output by the excitation circuit, which is the resonant frequency of the metal open-loop resonator and its surrounding frequencies).

[0059] This invention also provides a method for positioning using a uniform magnetic field achieved through BIC mode, which will be described below.

[0060] The positioning method of the present invention includes the following steps:

[0061] Provide a coupling unit, and place the provided coupling unit on the device to be positioned;

[0062] A detection antenna is provided, which includes a printed circuit board, multiple metal open resonant rings periodically arranged on the front side of the printed circuit board, and a metal excitation ring located at the center of the back side of the printed circuit board. Each metal open resonant ring is connected to a lumped capacitor. The detection antenna is placed on a parking platform.

[0063] An excitation source is provided and connected to a metal excitation ring. The excitation signal is transmitted to the metal excitation ring using the provided excitation source. Then, the magnetic dipole formed by the ring current on the metal excitation ring excites the BIC mode in the metal open resonant ring of the array.

[0064] A corresponding detection port is set at each metal open resonant ring, and the position of each detection port is calibrated.

[0065] When the device to be located is on the parking platform, the position information of the coupling unit on the device to be located is obtained by real-time detection of the changes in the induced voltage at each detection port and combined with the calibrated position of the detection port, thereby completing the positioning.

[0066] In one specific embodiment of the present invention, an excitation signal of a specific frequency is provided by an excitation source to a metal excitation ring, wherein the specific frequency is the resonant frequency of the metal open resonant ring or a frequency value near it.

[0067] In one specific embodiment of the present invention, multiple metal open resonant rings are arranged periodically on the front side of the printed circuit board in a mirror-symmetrical or rotationally symmetrical manner.

[0068] In one specific embodiment of the present invention, the geometric parameters of each metal open-ring resonator are consistent, and the capacitance values ​​of the lumped capacitors connected to each metal open-ring resonator are equal.

[0069] In one specific embodiment of the present invention, multiple detection antennas are provided, and multiple detection antenna arrays are arranged on the parking platform to cover the area of ​​the parking platform.

[0070] The beneficial effects of the positioning system and method of the present invention are as follows:

[0071] The positioning detection system and method of this invention are suitable for static and dynamic positioning scenarios of UAVs and some autonomous intelligent device terminals, with a detection area coverage of over 90% and a detection sensitivity of 100%. The main components of the detection antenna are PCB board and copper foil, which are extremely low in cost, simple in structure, easy to install, and occupy a small volume. The topology of the detection circuit and the complexity of the required microcontroller program are lower than those of mainstream methods, reducing the overall cost by at least 50%. The high-impedance detection unit design avoids interference from the magnetic field of charging power, and the system has excellent resistance to vibration and temperature and humidity changes, meeting the requirements for reliable operation in all weather conditions.

[0072] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. Those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention, and the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. A method for positioning using a uniform magnetic field based on the BIC mode, characterized in that, Includes the following steps: Provide a coupling unit, and place the provided coupling unit on the device to be positioned; A detection antenna is provided, which includes a printed circuit board, a plurality of metal open resonant rings periodically arranged on the front side of the printed circuit board, and a metal excitation ring located at the center of the back side of the printed circuit board. Each metal open resonant ring is connected to a lumped capacitor. The provided detection antenna is placed on a parking platform. An excitation source is provided and connected to the metal excitation ring. The excitation signal is transmitted to the metal excitation ring using the provided excitation source, and then the magnetic dipole formed by the ring current on the metal excitation ring excites the BIC mode in the metal open resonant ring of the array. A corresponding detection port is set at each metal open resonant ring, and the position of each detection port is calibrated. When the device to be located is on the parking platform, the position information of the coupling unit on the device to be located is obtained by real-time detection of the changes in the induced voltage at each detection port and combined with the calibrated position of the detection port, thereby completing the positioning.

2. The method for positioning using a uniform magnetic field based on the BIC mode as described in claim 1, characterized in that, The excitation source provides an excitation signal of a specific frequency to the metal excitation ring, wherein the specific frequency is the resonant frequency of the metal open resonant ring or a frequency value near it.

3. The method for positioning using a uniform magnetic field based on the BIC mode as described in claim 1, characterized in that, Multiple metal open resonant rings are arranged periodically on the front side of the printed circuit board in a mirror-symmetric or rotationally symmetric manner.

4. The method for positioning using a uniform magnetic field based on the BIC mode as described in claim 1, characterized in that, The geometric parameters of each metal open-ring resonator are consistent, and the capacitance values ​​of the lumped capacitors connected to each metal open-ring resonator are equal.

5. The method for positioning using a uniform magnetic field based on the BIC mode as described in claim 1, characterized in that, The provided detection antennas are multiple, and the multiple detection antenna arrays are set on the parking platform to cover the area of ​​the parking platform.

6. A system for positioning using a uniform magnetic field based on the BIC mode, characterized in that, include: The coupling unit is located on the device to be positioned. A detection antenna is mounted on a parking platform. The detection antenna includes a printed circuit board, a plurality of metal open resonant rings periodically arranged on the front side of the printed circuit board, and a metal excitation ring located at the center of the back side of the printed circuit board. Each metal open resonant ring is connected to a lumped capacitor. An excitation source is connected to the metal excitation ring. The excitation source is used to transmit an excitation signal to the metal excitation ring, and then the magnetic dipole formed by the ring current on the metal excitation ring excites the BIC mode in the array of the metal open resonant ring. Multiple detection ports are located at each metal-opening resonant ring on the front side of the printed circuit board; A detection circuit connected to each detection port, the detection circuit being used to detect the induced voltage formed at each detection port in real time; The processing module connected to the detection circuit is used to obtain the position information of the coupling unit on the device to be positioned by means of the change in induced voltage detected by the detection circuit and the calibration position of the detection port when the device to be positioned is located on the parking platform, thereby completing the positioning.

7. The system for positioning using a uniform magnetic field based on the BIC mode as described in claim 6, characterized in that, The excitation source provides an excitation signal of a specific frequency to the metal excitation ring, wherein the specific frequency is the resonant frequency of the metal open resonant ring or a frequency value near it.

8. The system for positioning using a uniform magnetic field based on the BIC mode as described in claim 6, characterized in that, Multiple metal open resonant rings are arranged periodically on the front side of the printed circuit board in a mirror-symmetric or rotationally symmetric manner.

9. The system for positioning using a uniform magnetic field based on the BIC mode as described in claim 6, characterized in that, The geometric parameters of each metal open-ring resonator are consistent, and the capacitance values ​​of the lumped capacitors connected to each metal open-ring resonator are equal.

10. The system for positioning using a uniform magnetic field based on the BIC mode as described in claim 6, characterized in that, The detection antennas are multiple, and the array of multiple detection antennas is arranged on the parking platform to cover the area of ​​the parking platform.

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