Radio frequency identification tag positioning system, method, device and storage medium

Abstract

The present application provides a radio frequency identification tag positioning system, method, device and storage medium, including: a power supply device, a passive RFID tag, at least three readers and a processor. The power supply device is used to generate an alternating magnetic field. The passive RFID tag includes a receiving end and a transmitting antenna, the receiving end generates an induced current based on the alternating magnetic field, and the transmitting antenna is activated and transmits a wireless signal based on the induced current. Each reader includes: an antenna device, which includes several directional antennas and several blocking devices, each directional antenna is separated by two adjacent blocking devices, and the directional antenna is used to receive the wireless signal emitted by the passive RFID tag along a specific direction. The processor is electrically connected to the at least three readers, and the processor locates the passive RFID tag based on the wireless signal emitted by the same passive RFID tag received by at least three readers. The present application solves the problem in the existing positioning system that the signal strength emitted by the tag has a great influence on the positioning accuracy of the tag.

Description

Technical Field

[0001] The present application relates to a wireless positioning system, and in particular to a radio frequency identification tag positioning system, method, device and storage medium. Background Art

[0002] Radio Frequency Identification (RFID) is a technology that uses radio frequency electromagnetic wave signals between an RFID reader and an RFID tag for contactless data exchange. The reader can send and receive wireless signals from the tag. RFID technology is widely used in a variety of scenarios, such as animal microchips, automotive microchip anti-theft devices, access control, parking lot management, production line automation, and material management.

[0003] RFID tags can be divided into active and passive tags. Passive RFID tags are microchips powered by high-frequency radio waves and read by readers using the same frequency band. When using passive RFID tags for positioning, the distance between the reader and the tag is estimated based on the signal strength emitted by the tag. However, since signal strength is susceptible to interference, the reader's positioning error can be significant. Furthermore, due to factors such as co-frequency and carrier co-location and safety regulations, the reader's reading and response distance is limited to between one and two meters. Summary of the Invention

[0004] In response to the problem that the signal strength emitted by the tag in the existing positioning system has a significant impact on the positioning accuracy of the tag, the present application provides a radio frequency identification tag positioning system, including: a power supply device, a passive RFID tag, at least three readers and a processor. The power supply device is used to generate an alternating magnetic field. The passive RFID tag includes a receiving end and a transmitting antenna, the receiving end generates an induced current based on the alternating magnetic field, and the transmitting antenna is activated and transmits a wireless signal based on the induced current. Each of the readers includes: an antenna device, which includes several directional antennas and several blocking devices, each of the directional antennas is separated by two adjacent blocking devices, and the directional antenna is used to receive the wireless signal emitted by the passive RFID tag along a specific direction. The processor is electrically connected to the at least three readers, and the processor locates the passive RFID tag based on the at least three readers receiving the wireless signal emitted by the same passive RFID tag.

[0005] Preferably, the several directional antennas in the antenna device are arranged in a circle and define a center of the circle. The several blocking devices divide the circle into several grids with reference to the center of the circle, and one end of each of the blocking devices is connected to the center of the circle.

[0006] Preferably, one end of each of the directional antennas is connected to the center of the circle, and the other end of each of the directional antennas is used to receive the wireless signal transmitted by the passive RFID tag into the corresponding grid.

[0007] Preferably, the receiving end and the transmitting antenna are co-structured.

[0008] Preferably, the power supply device includes a transmitting end resonator, which is used to generate the alternating magnetic field; the receiving end includes a receiving end resonator, and the transmitting end resonator and the receiving end resonator provide the power of the power supply device to the passive RFID tag through magnetic coupling resonance.

[0009] The present application also provides a radio frequency identification tag positioning method, which is applied to the radio frequency identification tag positioning system, comprising the following steps: searching for all directional antennas in a plurality of readers connected to the current passive RFID tag based on a wireless signal transmitted by the received passive RFID tag; and calculating the position of the current passive RFID tag based on the angles between adjacent directional antennas in the plurality of readers and the coordinates of the current passive RFID tag relative to the origin of all directional antennas.

[0010] Preferably, the step of calculating the position of the current passive RFID tag based on the angles between adjacent directional antennas in the plurality of readers and the coordinates of the current passive RFID tag relative to the origin of all directional antennas includes generating a linear equation based on the angles between adjacent directional antennas in the plurality of readers and the coordinates of the current passive RFID tag relative to the origin of all directional antennas, and calculating the coordinate values ​​of the current passive RFID tag based on each of the linear equations.

[0011] Preferably, the radio frequency identification tag positioning method further comprises: starting a power supply device to provide an alternating magnetic field to the passive RFID tag, so that the passive RFID tag generates an induced current based on the alternating magnetic field and transmits a wireless signal.

[0012] The present application also provides a radio frequency identification tag positioning device, comprising: a search unit and a position calculation unit. The search unit is configured to search for all directional antennas in a plurality of readers connected to a current passive RFID tag based on a received wireless signal transmitted by the passive RFID tag. The position calculation unit is configured to calculate the position of the current passive RFID tag based on the angles between adjacent directional antennas in the plurality of readers and the coordinates of the current passive RFID tag relative to the origin of all directional antennas.

[0013] The present application also provides a storage medium having computer-readable instructions stored thereon. When the computer-readable instructions are executed by a computer, the computer is caused to execute the radio frequency identification tag positioning method.

[0014] The beneficial effects of the present application are as follows: since the antenna device in each reader includes several directional antennas and several blocking devices, and each directional antenna is separated by two adjacent blocking devices, each directional antenna can only point to a specific direction after cooperating with the two adjacent blocking devices, that is, each directional antenna can only receive wireless signals emitted by a passive RFID tag in a certain direction. Once the wireless signal emitted by a passive RFID tag in a certain direction is received by the directional antenna, the wireless signal propagation path from the passive RFID tag to the directional antenna can form a straight line. When at least two directional antennas receive the wireless signal emitted by the same passive RFID tag, it means that the straight lines of each directional antenna and the passive RFID tag will intersect at an intersection. When the directional antennas and passive RFID tags in the three readers are connected, at least three intersections will be generated, and the average value of the positions of the three intersections is the position of the passive RFID tag. Therefore, regardless of the strength of the signal emitted by the passive RFID tag, as long as the directional antennas in at least three readers receive the wireless signal emitted by the passive RFID tag, the distance and orientation from the passive RFID tag to the at least three readers will remain fixed and will not change with the strength of the wireless signal emitted by the passive RFID tag received by the reader. Therefore, when the reader in this application locates the passive RFID tag, it will not be affected by the strength of the wireless signal emitted by the passive RFID tag, and the positioning accuracy of the passive RFID tag will not be affected by changes in the wireless signal strength emitted by the passive RFID tag.

[0015] The above description is only an overview of the technical solution of this application. In order to more clearly understand the technical means of this application and implement it in accordance with the contents of the specification, the following is a detailed description of this application with the preferred embodiments of the application and in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a block diagram of a radio frequency identification tag positioning system in one embodiment of the present application;

[0017] Figure 2 This is a schematic diagram of the operation of the radio frequency identification tag positioning system in one embodiment of the present application (the processor is omitted);

[0018] Figure 3 is a three-dimensional schematic diagram of an antenna device in one embodiment of the present application;

[0019] Figure 4is a flow chart of a radio frequency identification tag positioning method in another embodiment of the present application;

[0020] Figure 5 is a schematic diagram of a radio frequency identification tag positioning method in another embodiment of the present application;

[0021] Figure 6 This is a block diagram of a radio frequency identification tag positioning device in another embodiment of the present application.

[0022] Wherein, the reference numerals:

[0023] 1 RFID tag positioning system

[0024] 10 Power supply device

[0025] 11 Passive RFID tags

[0026] 12 Reader

[0027] 120 antenna device

[0028] 1200 directional antenna

[0029] 1201 Blocking device

[0030] 1202 Grille

[0031] 13 processors

[0032] 2 RFID tag positioning device

[0033] 20 Search Unit

[0034] 21 Position calculation unit

[0035] S1-S3 Steps of RFID Tag Positioning Method DETAILED DESCRIPTION

[0036] The following describes the implementation of the present application through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present application from the contents disclosed in this specification.

[0037] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of this application will be clearly and completely described below in combination with the drawings in the embodiments of this application. Obviously, the described embodiments are only embodiments of a part of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of this application.

[0038] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or precedence. In addition, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or apparatus.

[0039] It should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0040] like Figure 1 As shown, in one embodiment, a radio frequency identification tag positioning system 1 is provided, comprising: a power supply 10, a passive RFID tag 11, at least three readers 12, and a processor 13. The power supply 10 is used to generate an alternating magnetic field. The passive RFID tag 11 includes a receiving end and a transmitting antenna. The receiving end generates an induced current based on the alternating magnetic field, and the transmitting antenna is activated and transmits a wireless signal based on the induced current. The receiving end and the transmitting antenna can be connected via an integrated circuit. The receiving end and the transmitting antenna can be co-constructed. That is, the receiving end and the transmitting antenna can be integrated, capable of both receiving the alternating magnetic field for power supply and transmitting wireless signals. The receiving end and the transmitting antenna can be co-constructed on the same plane. For example, the passive RFID tag 11 can use a thin support substrate as its support substrate, with the receiving end and the transmitting antenna co-constructed and etched on the support substrate. The power supply 10 can be located within the reader 12 or independently, but not in contact with the passive RFID tag 11. The induced current generated by the receiving end can power the transmitting antenna, enabling it to operate. Passive RFID tags 11 are electronic tags that lack their own power source (e.g., a battery) and require power from other devices. Power supply device 10 may include a transmitter resonator for generating an alternating magnetic field. The receiver may include a receiver resonator. The alternating magnetic field has the same frequency as the transmitter resonator and the receiver resonator. The transmitter resonator and the receiver resonator are in a resonant operating state, allowing power from power supply device 10 to be supplied to passive RFID tag 11 through magnetic coupling resonance.

[0041] like Figure 1 As shown, processor 13 is electrically connected to at least three readers 12. Processor 13 locates passive RFID tag 11 based on wireless signals transmitted by the same passive RFID tag 11 received by at least three readers 12. How processor 13 locates passive RFID tag 11 based on wireless signals transmitted by at least three readers 12 and one passive RFID tag 11 can be described in the subsequent embodiments of the radio frequency identification tag location method. Processor 13 can be a CPU (central processing unit) or an MCU (microcontroller). Processor 13 and reader 12 can be electrically connected via an integrated circuit or wires.

[0042] like Figure 2 As shown, each reader 12 includes an antenna assembly 120 comprising several directional antennas 1200 and several barriers 1201. Each directional antenna 1200 is separated by two adjacent barriers 1201. The directional antennas 1200 are configured to receive wireless signals transmitted by the passive RFID tag 11 in a specific direction. The directional antennas 1200 can receive wireless signals transmitted by the passive RFID tag 11 using a relatively small receiving area (approximately a point-like receiving area), ensuring that the wireless signal propagation path from the passive RFID tag 11 to the connected directional antenna 1200 is approximately a straight line. The number of directional antennas 1200 and barriers 1201 can be 16. The blocking device 1201 can be a blocking plate. For example, the blocking device 1201 can be a blocking plate made of non-magnetic materials such as copper and aluminum, which can shield wireless signals to ensure that the wireless signals entering between two adjacent blocking devices 1201 can only be received by the directional antenna 1200 between the two adjacent blocking devices 1201, and the wireless signals entering between the two adjacent blocking devices 1201 will not be received by the directional antenna 1200 adjacent to the directional antenna 1200 that receives the wireless signal.

[0043] Because the antenna assembly 120 in each reader 12 includes several directional antennas 1200 and several blocking devices 1201, and each directional antenna 1200 is separated by two adjacent blocking devices 1201, each directional antenna 1200 can only point in a specific direction when used in conjunction with two adjacent blocking devices 1201. In other words, each directional antenna 1200 can only receive wireless signals transmitted by a passive RFID tag 11 in a single direction. Once a wireless signal transmitted by a passive RFID tag 11 in a certain direction is received by a directional antenna 1200, the wireless signal propagation path from the passive RFID tag 11 to the directional antenna 1200 can form a straight line. When at least two directional antennas 1200 receive the wireless signal transmitted by the same passive RFID tag 11, the straight lines between the directional antennas 1200 and the passive RFID tag 11 intersect at a point of intersection. When the directional antennas 1200 in the three readers 12 are connected to the passive RFID tag 11, at least three intersection points are generated. The average value of the three intersection points is the position of the passive RFID tag 11. Therefore, regardless of whether the signal strength emitted by the passive RFID tag 11 is strong or weak, as long as the directional antennas 1200 in at least three readers 12 receive the wireless signal emitted by the passive RFID tag 11, the distance and direction from the passive RFID tag 11 to the at least three readers 12 will be fixed and will not change with the strength of the wireless signal emitted by the passive RFID tag 11 received by the reader 12. Therefore, when the reader 12 in this embodiment locates the passive RFID tag 11, it will not be affected by the strength of the wireless signal emitted by the passive RFID tag 11, and the positioning accuracy of the passive RFID tag 11 will not be affected by changes in the strength of the wireless signal emitted by the passive RFID tag 11.

[0044] like Figure 2As shown, preferably, the plurality of directional antennas 1200 in the antenna assembly 120 are arranged in a circle with a defined center. A plurality of barrier devices 1201 divide the circle into a plurality of grids 1202 with the center as a reference. One end of each barrier device 1201 is connected to the center. One end of each directional antenna 1200 is connected to the center, and the other end of each directional antenna 1200 is used to receive wireless signals transmitted by the passive RFID tag 11 into the corresponding grid 1202. The directional antennas 1200 can be long strips, and one end of all directional antennas 1200 can be connected to the center. The line connecting the directional antennas 1200 and the passive RFID tag 11 and the wireless signal propagation path from the passive RFID tag 11 to the directional antennas 1200 can be collinear and pass through the center of the circle. The barrier devices 1201 can be evenly distributed along the circumference of the circle with the center as a reference, dividing the circle into a plurality of sector-shaped grids 1202, with each pair of adjacent barrier devices 1201 sandwiched together to form a grid 1202. The greater the number of grids 1202 , the smaller the angle between adjacent directional antennas 1200 , and the more accurate the positioning of the passive RFID tag 11 .

[0045] like Figure 3 As shown, directional antenna 1200 can be in the shape of a straight rod, and the angles between directional antenna 1200 and two adjacent barrier devices 1201 can be equal. Barrier devices 1201 can be long plates, and directional antenna 1200 can be located in the middle of the length of barrier devices 1201. Grid 1202 can be a three-dimensional space with a sector-shaped cross-section. Wireless signals can be received by directional antenna 1200 along the axial direction of directional antenna 1200.

[0046] The frequency of the wireless signal can comply with ISO standards on RFID, such as ISO / IEC18000-6C (63) and ISO / IEC18000-6D (64), and its frequency can be 900 MHz and above, so that the passive RFID tag 11 can be compatible with existing RFID systems that comply with ISO RFID standards.

[0047] like Figure 4 As shown, in another embodiment, a radio frequency identification tag positioning method is provided, which is applied to a radio frequency identification tag positioning system 1 (please refer to the attached figure for the marking of the radio frequency identification tag positioning system 1). Figure 1), comprising the following steps: S1: starting the power supply device 10 to provide an alternating magnetic field to the passive RFID tag 11, so that the passive RFID tag 11 generates an induced current based on the alternating magnetic field and transmits a wireless signal. S2: searching for all directional antennas 1200 in the plurality of readers 12 connected to the current passive RFID tag 11 based on the received wireless signal transmitted by the passive RFID tag 11. Since the angles between adjacent directional antennas 1200 are known, the origin coordinates of each directional antenna 1200 are also known. Once all directional antennas 1200 in the plurality of readers 12 connected to the current passive RFID tag 11 are found, the azimuth angles and origin coordinates of all directional antennas 1200 in the plurality of readers 12 connected to the current passive RFID tag 11 can also be determined. S3: Calculate the position of the current passive RFID tag 11 based on the angles between adjacent directional antennas 1200 in the readers 12 and the coordinates of the current passive RFID tag 11 relative to the origin of all directional antennas 1200 (specifically all directional antennas 1200 connected to the passive RFID tag 11).

[0048] Preferably, step S3 includes generating a linear equation based on the angles between adjacent directional antennas 1200 in the plurality of readers 12 and the coordinates of the current passive RFID tag 11 relative to the origin of all directional antennas 1200 (specifically, all directional antennas 1200 connected to the passive RFID tag 11). The coordinates of the current passive RFID tag 11 are calculated based on each linear equation. The linear equation may be a linear equation as described in subsequent embodiments.

[0049] like Figure 5 As shown, since the origin coordinates of the directional antennas 1200 in different readers 12 are known when the reader 12 is manufactured or installed, the angles between the directional antennas 1200 are also known. As can be seen from the aforementioned embodiments, the line connecting the directional antennas 1200 and the passive RFID tag 11 can be made collinear with the wireless signal propagation path from the passive RFID tag 11 to the directional antennas 1200 connected thereto. Furthermore, the azimuth angle of the straight line formed by the wireless signal propagation path from the passive RFID tag 11 to the directional antennas 1200 connected thereto is also known. By establishing a linear equation based on the angles between the directional antennas 1200 and the origin coordinates of each directional antenna 1200, the coordinates of the current passive RFID tag 11 can be solved, thereby achieving the positioning of the current passive RFID tag 11.

[0050] like Figure 5As shown, take the connection of three readers 12 and a current passive RFID tag 11 in a two-dimensional plane as an example (the positioning method for the current passive RFID tag 11 in three-dimensional space is similar). The wireless signal propagation paths of the three directional antennas 1200 will intersect with each other, forming three intersection points. The average coordinate value of the three intersection points is taken as the coordinate position of the current passive RFID tag 11. The following description only uses one of the three intersection points as an example (the coordinate calculation method for the other two intersection points is the same). Taking the origins O1 and O2 of the directional antennas 1200 connected to the current passive RFID tag 11 in the two readers 12 as the coordinate origins, two XoY rectangular coordinate systems are established, namely coordinate system Xo1Y and coordinate system Xo2Y. The origin coordinates of one directional antenna 1200 in coordinate system Xo1Y are (Xo1, Yo1). The origin coordinates of the other directional antenna 1200 in coordinate system Xo2Y are (Xo2, Yo2). The angle between the directional antenna 1200 in the coordinate system Xo1Y connected to the current passive RFID tag 11 and the X-axis in the coordinate system Xo1Y is θ1 (θ1 is the azimuth angle of the straight line formed by the wireless signal propagation path from the passive RFID tag 11 to the directional antenna 1200 connected thereto in the coordinate system Xo1Y). The angle between the directional antenna 1200 in the coordinate system Xo2Y connected to the current passive RFID tag 11 and the X-axis in the coordinate system Xo2Y is θ2 (θ2 is the azimuth angle of the straight line formed by the wireless signal propagation path from the passive RFID tag 11 to the directional antenna 1200 connected thereto in the coordinate system Xo2Y). Both the angles θ1 and θ2 are known (for example, one directional antenna 1200 can be made to coincide with the X-axis in the coordinate system Xo1Y, and then θ1 can be obtained by adding the angles between the various directional antennas 1200. θ2 can be obtained using a similar method).

[0051] Assume that the coordinates of the intersection of the propagation path of the wireless signal pointing to antenna 1200 in coordinate system Xo1Y and the propagation path of the wireless signal pointing to antenna 1200 in coordinate system Xo2Y are defined as (x1, y1) in coordinate system Xo1Y and (x2, y2) in coordinate system Xo2Y. The intersection coordinates (x1, y1) and (x2, y2) are both to be determined (the intersection coordinates (x1, y1) and (x2, y2) are the coordinate expressions of the same intersection in different coordinate systems). The linear equation for the intersection coordinates (x1, y1) in coordinate system Xo1Y is: y1 = tanθ1x1. The linear equation for the intersection coordinates (x2, y2) in coordinate system Xo2Y is: y2 = tanθ2x2. According to the distance between the origin (Xo1, Yo1) and the origin (Xo2, Yo2) in the x-axis direction, a linear equation can be established: |xo1-xo2|=|x1-xo1|+|x2-xo2|. According to the distance between the origin (Xo1, Yo1) and the origin (Xo2, Yo2) in the y-axis direction, a linear equation can be established: |yo1-yo2|=|y1-yo1|-|y2-yo2|. Then according to the linear equation system: The intersection coordinates (x1, y1) and (x2, y2) can be solved.

[0052] Similarly, taking the origin O3 of another reader 12 different from the aforementioned two readers 12 as the coordinate origin, a rectangular coordinate system Xo3Y is established. Then, the wireless signal propagation path of the directional antenna 1200 connected to the current passive RFID tag 11 in the other reader 12 (in the coordinate system Xo3Y, the azimuth angle of the straight line formed by the wireless signal propagation path from the passive RFID tag 11 to the directional antenna 1200 connected thereto is θ3) and the wireless signal propagation path of the directional antenna 1200 in the coordinate system Xo1Y and the coordinate system Xo2Y can intersect respectively to form two intersection points. The calculation method of the coordinates of the two intersection points can refer to the calculation of the coordinates of the aforementioned intersection points. After the coordinates of the three intersection points are calculated, the average value is taken to obtain the coordinates of the current passive RFID tag 11.

[0053] The more readers 12 connected to the current passive RFID tag 11, the more accurate the positioning of the current passive RFID tag 11. This is because the more readers 12 connected to the current passive RFID tag 11, the more directional antennas 1200 connected to the current passive RFID tag 11 can provide. In turn, each connected directional antenna 1200 can generate more intersections that can provide wireless signal propagation paths. Taking the average of all intersections can make the coordinates of the current passive RFID tag 11 closer to the actual coordinates. Because the above equation is a linear equation, the calculation in this embodiment is simpler than the prior art method of using a quadratic equation to calculate the distance between the reader 12 and the electronic tag for positioning. The above embodiment is based on the example of the case where the reader 12 and the current passive RFID tag 11 are relatively stationary. When the reader 12 and the current passive RFID tag 11 are moving relative to each other, those skilled in the art only need to know the relative movement speed of the reader 12 and the current passive RFID tag 11. The above equation can still be used to dynamically locate the current passive RFID tag 11.

[0054] like Figure 6 As shown, in another embodiment, a radio frequency identification tag positioning device 2 is provided, comprising: a search unit 20 and a position calculation unit 21. The search unit 20 is used to search for all directional antennas 1200 in a plurality of readers 12 connected to the current passive RFID tag 11 based on the wireless signal transmitted by the received passive RFID tag 11. The position calculation unit 21 is used to calculate the position of the current passive RFID tag 11 based on the angles between adjacent directional antennas 1200 in the plurality of readers 12 and the coordinates of the current passive RFID tag 11 relative to the origin of all directional antennas 1200 (specifically, all directional antennas 1200 connected to the passive RFID tag 11).

[0055] In another embodiment, a storage medium is provided, which stores computer-readable instructions. When executed by a computer, the computer executes the RFID tag location method described in the aforementioned embodiment. The storage medium may include a read-only memory (ROM), a random access memory (RAM), a hard disk, or an optical disk.

[0056] The above describes in detail the RFID tag positioning system, method, device, and storage medium provided in the embodiments of the present application. For those skilled in the art, the specific implementation methods and application scopes may vary based on the concepts of the embodiments of the present application. In summary, the contents of this specification should not be construed as limiting the present application. All equivalent modifications or changes made based on the spirit and technical concepts of the present application shall still be covered by the claims of the present application.

Claims

1. A radio frequency identification tag positioning system, characterized in that: include: a power supply device for generating an alternating magnetic field; A passive RFID tag comprising a receiving end and a transmitting antenna, wherein the receiving end generates an induced current based on the alternating magnetic field, and the transmitting antenna is activated and transmits a wireless signal based on the induced current; At least three readers, each of said readers comprising: an antenna device comprising a plurality of directional antennas and a plurality of blocking devices, wherein each of the directional antennas is separated by two adjacent blocking devices, and the directional antennas are used to receive the wireless signal transmitted by the passive RFID tag along a specific direction; and A processor is electrically connected to the at least three readers, the processor generates at least three intersection points based on the wireless signals transmitted by the same passive RFID tag received by the at least three readers, and the processor locates the passive RFID tag based on an average value of the three intersection points, wherein the processor calculates the current position of the passive RFID tag based on the angles between adjacent directional antennas of the at least three readers and the coordinates of the current passive RFID tag relative to the origin of all directional antennas.

2. The RFID tag positioning system according to claim 1, characterized in that: The plurality of directional antennas in the antenna device are arranged in a circle and define a center. The plurality of barrier devices divide the circle into a plurality of grids with reference to the center, and one end of each barrier device is connected to the center.

3. The RFID tag positioning system according to claim 2, characterized in that: One end of each of the directional antennas is connected to the center of the circle, and the other end of each of the directional antennas is used to receive the wireless signal transmitted by the passive RFID tag into the corresponding grid.

4. The RFID tag positioning system according to claim 1, wherein: The receiving end and the transmitting antenna are co-structured.

5. The RFID tag positioning system according to claim 1, characterized in that: The power supply device includes a transmitting end resonator, which is used to generate the alternating magnetic field; the receiving end includes a receiving end resonator, and the transmitting end resonator and the receiving end resonator provide the power of the power supply device to the passive RFID tag through magnetic coupling resonance.

6. A radio frequency identification tag positioning method, applied to the radio frequency identification tag positioning system according to any one of claims 1 to 5, characterized in that: The following steps are involved: Searching for all directional antennas in a plurality of readers connected to the current passive RFID tag according to the wireless signal transmitted by the received passive RFID tag; as well as The position of the current passive RFID tag is calculated according to the angles between adjacent directional antennas in the plurality of readers and the coordinates of the current passive RFID tag relative to the origin of all directional antennas.

7. The RFID tag positioning method according to claim 6, characterized in that: The step of calculating the position of the current passive RFID tag based on the angles between adjacent directional antennas in the plurality of readers and the coordinates of the current passive RFID tag relative to the origin of all directional antennas includes: Generate a linear equation based on the angles between the adjacent directional antennas in the plurality of readers and the coordinates of the current passive RFID tag relative to the origin of all the directional antennas; and The coordinate value of the current passive RFID tag is calculated according to each of the linear equations.

8. The RFID tag positioning method according to claim 6, wherein: Also includes: The power supply device is started to provide an alternating magnetic field to the passive RFID tag, so that the passive RFID tag generates an induced current based on the alternating magnetic field and transmits a wireless signal.

9. A storage medium, characterized in that: Computer-readable instructions are stored thereon, and when the computer-readable instructions are executed by a computer, the computer is caused to execute the radio frequency identification tag positioning method according to claim 6.

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