CN116008907A

CN116008907A - Radio frequency identification tag positioning system, method, device and storage medium

Info

Publication number: CN116008907A
Application number: CN202211097674.9A
Authority: CN
Inventors: 李俊民; 林宪志
Original assignee: Fengyan Zhuhai Technology Co ltd
Current assignee: Fengyan Zhuhai Technology Co ltd
Priority date: 2022-09-08
Filing date: 2022-09-08
Publication date: 2023-04-25

Abstract

The application provides a radio frequency identification tag positioning system, a method, a device and a storage medium, comprising the following steps: the system comprises a power supply device, a passive RFID tag, at least three readers and a processor. The power supply device is used for generating an alternating magnetic field. The passive RFID tag includes a receiving end that generates an induced current based on an alternating magnetic field, and a transmitting antenna that starts and transmits a wireless signal based on the induced current. Each reader comprises: an antenna device comprising a plurality of directional antennas and a plurality of barrier devices, each directional antenna being separated by two adjacent barrier devices, the directional antennas being for receiving wireless signals transmitted by passive RFID tags in a specific direction. The processor is electrically connected with the at least three readers, and the processor positions the passive RFID tag based on the fact that the at least three readers receive wireless signals transmitted by the same passive RFID tag. The method and the device solve the problem that the signal intensity emitted by the tag in the existing positioning system has a large influence on the positioning accuracy of the tag.

Description

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

Technical Field

The present disclosure relates to wireless positioning systems, and more particularly, to a system, method, apparatus, and storage medium for positioning radio frequency identification tags.

Background

Radio frequency identification (Radio Frequency Identification, RFID for short) is a non-contact data information interaction between a radio frequency identification reader (reader) and a radio frequency identification tag (RFID tag) by means of a radio frequency electromagnetic wave signal. The reader may transmit and receive wireless signals from the tag. Radio frequency identification technology is widely used in a variety of contexts, such as animal wafer, car wafer burglar alarm, door control, parking lot control, production line automation, and material management.

RFID tags can be classified into active RFID tags and passive RFID tags, the passive RFID tags are micro-chips powered by high frequency waves and read data by a reader at the same time using the same wave band. When the passive RFID tag is used for positioning, the distance between the reader and the passive RFID tag can be estimated according to the signal intensity emitted by the passive RFID tag, and the positioning error of the reader to the passive RFID tag is large because the signal intensity is easy to interfere. And because of factors such as common-frequency loading common-loading and safety regulations, the reading and reaction distances of the reader are limited to one meter to two meters.

Disclosure of Invention

Aiming at the problem that the signal intensity emitted by a tag in the existing positioning system has great influence on the positioning precision of the tag, the application provides a radio frequency identification tag positioning system, which comprises: the system comprises a power supply device, a passive RFID tag, at least three readers and a processor. The power supply device is used for generating an alternating magnetic field. The passive RFID tag comprises a receiving end and a transmitting antenna, wherein the receiving end generates induction current based on the alternating magnetic field, and the transmitting antenna is started and transmits wireless signals based on the induction current. Each of the readers includes: an antenna device comprising a plurality of directional antennas and a plurality of baffle devices, each of the directional antennas being separated by two adjacent baffle devices, the directional antennas being configured to receive the wireless signals transmitted by the passive RFID tag in a particular direction. The processor is electrically connected with the at least three readers, and the processor positions the passive RFID tag based on the fact that the at least three readers receive the wireless signals transmitted by the same passive RFID tag.

Preferably, the plurality of directional antennas in the antenna device are arranged into a circle and define a center, the plurality of baffle devices divide the circle into a plurality of grids with the center as a reference, and one end of each baffle device is connected to the center.

Preferably, one end of each directional antenna is connected to the circle center, and the other end of each directional antenna is used for receiving the wireless signal emitted by the passive RFID tag into the corresponding grid.

Preferably, the receiving end and the transmitting antenna are formed in a co-structure manner.

Preferably, the power supply device comprises a transmitting end resonator, and the transmitting end resonator is used for generating the alternating magnetic field; the receiving end comprises a receiving end resonator, and the transmitting end resonator and the receiving end resonator provide the power of the power supply device for the passive RFID tag through magnetic coupling resonance.

The application also provides a radio frequency identification tag positioning method which is applied to the radio frequency identification tag positioning system and comprises the following steps: and searching all the directional antennas in a plurality of readers connected with the current passive RFID tag according to the received wireless signals transmitted by the passive RFID tag. And calculating the position of the current passive RFID tag according to the included angle between each adjacent directional antenna in the plurality of readers and the coordinates of the current passive RFID tag relative to the origin of all the directional antennas.

Preferably, the step of calculating the position of the current passive RFID tag according to the included angle between each adjacent one of the plurality of readers and the coordinates of the current passive RFID tag with respect to the origin of all the directional antennas includes: and generating a linear equation according to the included 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 calculating coordinate values of the current passive RFID tag according to each linear equation.

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

The application also provides a radio frequency identification tag positioning device, comprising: a search unit and a position calculation unit. The searching unit is used for searching all the directional antennas in the plurality of readers connected with the current passive RFID tag according to the received wireless signals transmitted by the passive RFID tag. The position calculation unit is used for calculating the position of the current passive RFID tag according to the included angle between each adjacent directional antenna in the plurality of readers and the coordinates of the current passive RFID tag relative to the origin of all the directional antennas.

The present application also provides a storage medium having stored thereon computer readable instructions which, when executed by a computer, cause the computer to perform the radio frequency identification tag locating method.

The beneficial effects of this application lie in: because the antenna device in each reader comprises a plurality of directional antennas and a plurality of baffle devices, each directional antenna is separated by two adjacent baffle devices, each directional antenna can only point to a specific direction after being matched with two adjacent baffle devices, namely, each directional antenna can only receive wireless signals emitted by passive RFID tags in a certain direction, and once the wireless signals emitted by the passive RFID tags in the certain direction are received by the directional antennas, the wireless signal propagation path from the passive RFID tags to the directional antennas can form a straight line. When at least two directional antennas receive wireless signals transmitted by the same passive RFID tag, the straight lines of the directional antennas and the passive RFID tag are intersected at an intersection point. At least 3 intersection points are generated when the directional antenna in the three readers is connected with the passive RFID tag, and the average value of the positions of the 3 intersection points is the position of the passive RFID tag. Thus, regardless of whether the signal strength of the passive RFID tag is strong or weak, as long as the directional antenna of the at least three readers receives the wireless signal transmitted by the passive RFID tag, the distance and orientation of the passive RFID tag to the at least three readers will be fixed and will not vary with the strength of the wireless signal transmitted by the passive RFID tag received by the reader. Therefore, when the reader positions the passive RIFD tag, the reader is not influenced by the intensity of the wireless signal emitted by the passive RFID tag, and the positioning accuracy of the passive RFID tag is not influenced due to the change of the intensity of the wireless signal emitted by the passive RFID tag.

The foregoing description is only an overview of the technical solutions of the present application, and in order to make the technical means of the present application more clearly understood, the present application may be implemented according to the content of the specification, and the following detailed description of the preferred embodiments of the present application will be given with reference to the accompanying drawings.

Drawings

FIG. 1 is a block diagram of a RFID tag locating system in accordance with one embodiment of the present application;

FIG. 2 is a schematic diagram of the operation of a RFID tag locating system (with the processor omitted) according to one embodiment of the present application;

fig. 3 is a schematic perspective view of an antenna device according to an embodiment of the present disclosure;

FIG. 4 is a flow chart of a method for locating a radio frequency identification tag in accordance with another embodiment of the present application;

FIG. 5 is a schematic diagram of a method for locating a RFID tag according to another embodiment of the present application;

fig. 6 is a block diagram of an rfid tag locating device in accordance with another embodiment of the present application.

Wherein, the reference numerals:

1. radio frequency identification tag positioning system

10. Power supply device

11. Passive RFID tag

12. Reading device

120. Antenna device

1200. Directional antenna

1201. Baffle device

1202. Grille

13. Processor and method for controlling the same

2. Radio frequency identification tag positioning device

20. Search unit

21. Position calculation unit

S1-S3 radio frequency identification tag positioning method

Detailed Description

Further advantages and effects of the present application will be readily apparent to those skilled in the art from the present disclosure, by describing the embodiments of the present application with specific examples.

It should be noted that, without conflict, the embodiments and features of the embodiments in the present application may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the mechanical connection and the electrical connection can be adopted; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

As shown in fig. 1, in one embodiment, there is provided a radio frequency identification tag locating system 1 comprising: a power supply 10, a passive RFID tag 11, at least three readers 12 and a processor 13. The power supply device 10 is used for generating an alternating magnetic field. The passive RFID tag 11 includes a receiving end that generates an induced current based on an alternating magnetic field, and a transmitting antenna that starts and transmits a wireless signal based on the induced current. The receiving end and the transmitting antenna may be connected by an integrated circuit. The receiving end and the transmitting antenna may be formed in a co-constructed manner. That is, the receiving end and the transmitting antenna can be integrated, which can not only receive the alternating magnetic field for power supply, but also transmit wireless signals. The receiving end and the transmitting antenna may be co-configured in the same plane. For example, the passive RFID tag 11 may have a thin type of loadable board as its carrier substrate, so that the receiving end and the transmitting antenna are co-configured and etched on the loadable board. The power supply 10 may be provided in the reader 12 or may be provided separately, but is not in contact with the passive RFID tag 11. The induced current generated by the receiving end can supply power to the transmitting antenna so that the transmitting antenna can work electrically. The passive RFID tag 11 is a type of electronic tag that does not have its own power source (e.g., a battery) and requires other devices to be powered. The power supply device 10 may include a transmitting-end resonator for generating an alternating magnetic field. The receiving end may include a receiving end resonator, and the frequency of the alternating magnetic field, the frequency of the transmitting end resonator, and the frequency of the receiving end resonator are the same, so that the transmitting end resonator and the receiving end resonator are in a resonant operation state, so that the power of the power supply device 10 is supplied to the passive RFID tag 11 through magnetic coupling resonance.

As shown in fig. 1, the processor 13 is electrically connected to at least three readers 12, and the processor 13 locates the passive RFID tag 11 based on the at least three readers 12 receiving wireless signals transmitted from the same passive RFID tag 11. How the processor 13 locates the passive RFID tag 11 based on the wireless signals transmitted by the at least three readers 12 and the one passive RFID tag 11 may be referred to in the description of the embodiments of the radio frequency identification tag locating method that follow. The processor 13 may be a CPU (central processing unit) or an MCU (single chip microcomputer), and the processor 13 and the reader 12 may be electrically connected through an integrated circuit or an electric wire.

As shown in fig. 2, each reader 12 includes: the antenna device 120 comprises a plurality of directional antennas 1200 and a plurality of blocking devices 1201, wherein each directional antenna 1200 is separated by two adjacent blocking devices 1201, and the directional antenna 1200 is used for receiving the wireless signal emitted by the passive RFID tag 11 along a specific direction. The directional antenna 1200 may receive the wireless signal emitted from the passive RFID tag 11 with a relatively small receiving area (the receiving area is close to a dot shape) so that the wireless signal propagation path of the passive RFID tag 11 to the directional antenna 1200 connected thereto is substantially straight. The number of directional antennas 1200 and barrier means 1201 may be 16. The baffle devices 1201 may be baffles, for example, the baffle devices 1201 may be baffles made of a non-magnetic material such as copper, aluminum, or the like, which may shield wireless signals to ensure that wireless signals entering between two adjacent baffle devices 1201 are only received by the directional antenna 1200 between the two adjacent baffle devices 1201, such that wireless signals entering between two adjacent baffle devices 1201 are not received by the directional antenna 1200 adjacent to the directional antenna 1200 receiving the wireless signals.

Since the antenna device 120 in each reader 12 includes several directional antennas 1200 and several blocking devices 1201, each directional antenna 1200 is separated by two adjacent blocking devices 1201, each directional antenna 1200 can only point in a specific direction after being matched with two adjacent blocking devices 1201, that is, each directional antenna 1200 can only receive the wireless signal emitted by the passive RFID tag 11 in a single direction, once the wireless signal emitted by the passive RFID tag 11 in a single direction is received by the 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 signals transmitted by the same passive RFID tag 11, it is indicated that each line of the directional antennas 1200 and the passive RFID tag 11 intersect at an intersection point. At least 3 intersections are generated when the directional antenna 1200 in the three readers 12 is connected with the passive RFID tag 11, and the average value of the positions of the 3 intersections is the position of the passive RFID tag 11. Thus, regardless of whether the signal strength of the passive RFID tag 11 is strong or weak, as long as the directional antenna 1200 in the at least three readers 12 receives the wireless signal transmitted by the passive RFID tag 11, the distance and orientation of the passive RFID tag 11 to the at least three readers 12 will be fixed and will not vary with the strength of the wireless signal transmitted by the passive RFID tag 11 received by the readers 12. Therefore, when the reader 12 in this embodiment locates the passive RIFD tag 11, it is not affected by the intensity of the wireless signal emitted by the passive RFID tag 11, and the location accuracy of the passive RFID tag 11 is not affected by the change of the intensity of the wireless signal emitted by the passive RFID tag 11.

As shown in fig. 2, preferably, a plurality of directional antennas 1200 in the antenna device 120 are arranged in a circle, and define a center, and a plurality of baffle devices 1201 are referenced to the center to divide the circle into a plurality of grids 1202, and one end of each baffle device 1201 is connected to the center. One end of each directional antenna 1200 is connected to the center of the circle, and the other end of each directional antenna 1200 is used for receiving the wireless signal emitted by the passive RFID tag 11 into the corresponding grid 1202. The directional antenna 1200 may be in a long strip shape, and one end of all the directional antennas 1200 may be connected at the center of the circle. The line of the directional antenna 1200 and the passive RFID tag 11 may be collinear with the wireless signal propagation path of the passive RFID tag 11 to the directional antenna 1200 and through the center of the circle. The baffle devices 1201 can be uniformly distributed along the circumferential direction of the circle by taking the circle center as a reference, the circle is divided into a plurality of fan-shaped grids 1202, and each two adjacent baffle devices 1201 are clamped into one grid 1202. The greater the number of gratings 1202, the smaller the angle between adjacent directional antennas 1200, the more accurate the positioning of the passive RFID tag 11.

As shown in fig. 3, the directional antenna 1200 may be in a straight rod shape, and the angle between the directional antenna 1200 and the adjacent two barrier devices 1201 may be equal. The baffle 1201 is a long plate and the directional antenna 1200 may be located at a middle position in the length direction of the baffle 1201. The grille 1202 can be a solid space with a fan-shaped cross section. The wireless signal may be received by the directional antenna 1200 in an axial direction of the directional antenna 1200.

The frequency of the wireless signal may follow an ISO standards for RFID such as ISO/IEC18000-6C (63), ISO/IEC18000-6D (64), which may be 900Mhz and above, so that the passive RFID tag 11 may be compatible with existing RFID systems that conform to the ISO RFID related standards.

As shown in fig. 4, in another embodiment, a method for positioning an rfid tag is provided, which is applied to an rfid tag positioning system 1 (please refer to fig. 1 for marking the rfid tag positioning system 1), and includes the following steps: s1: the power supply device 10 is activated to provide an alternating magnetic field to the passive RFID tag 11 to cause the passive RFID tag 11 to generate an induced current based on the alternating magnetic field and to emit a wireless signal. S2: all the directional antennas 1200 in the number of readers 12 connected to the current passive RFID tag 11 are found from the received wireless signal transmitted by the passive RFID tag 11. Since the angle between the adjacent directional antennas 1200 is known, the origin coordinates of each directional antenna 1200 are also known, and after all the directional antennas 1200 in the plurality of readers 12 connected to the current passive RFID tag 11 are found, the azimuth and origin coordinates of all the directional antennas 1200 in the plurality of readers 12 connected to the current passive RFID tag 11 can be determined. S3: the position of the current passive RFID tag 11 is calculated based on the angle between each adjacent directional antenna 1200 of the plurality of readers 12 and the coordinates of the current passive RFID tag 11 with respect to the origin of all directional antennas 1200 (particularly all directional antennas 1200 connected to the passive RFID tag 11).

Preferably, step S3 includes: a linear equation is generated based on the angle between each adjacent directional antenna 1200 of the plurality of readers 12 and the coordinates of the current passive RFID tag 11 with respect to the origin of all directional antennas 1200 (particularly all directional antennas 1200 connected to the passive RFID tag 11). The coordinate values of the current passive RFID tag 11 are calculated according to the respective linear equations. The linear equation may be a linear equation of a degree in the subsequent embodiments.

As shown in fig. 5, since the origin coordinates of the directional antennas 1200 in different readers 12 are known at the time of manufacture or installation of the readers 12, the angle between the directional antennas 1200 is also known. As can be seen from the foregoing embodiments, the connection line between the directional antenna 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 antenna 1200 connected thereto, and further, 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 also known. The coordinates of the current passive RFID tag 11 can be solved by establishing a linear equation through the included angle between the directional antennas 1200 and the origin coordinates of the directional antennas 1200, so that the current passive RFID tag 11 is positioned.

As shown in fig. 5, three readers 12 are connected to one current passive RFID tag 11 in a two-dimensional plane (the positioning method of the current passive RFID tag 11 in a three-dimensional space is similar) is taken as an example. The three wireless signal propagation paths of the directional antenna 1200 intersect each other to form three intersection points, and the average value of the coordinates of the three intersection points is taken as the coordinate position of the current passive RFID tag 11. In the following, only one of the three intersections will be described as an example (the coordinate calculation method of the other two intersections is the same). Two XoY rectangular coordinate systems, namely a coordinate system Xo1Y and a coordinate system Xo2Y, are established by taking the origins O1 and O2 of the pointing antenna 1200 connected with the current passive RFID tag 11 in the two readers 12 as the origin of coordinates. The origin coordinates of one pointing antenna 1200 in the coordinate system Xo1Y are (Xo 1, yo 1). The origin coordinates of the other pointing antenna 1200 in the coordinate system Xo2Y are (Xo 2, yo 2). The pointing antenna 1200 in the coordinate system Xo1Y connected to the current passive RFID tag 11 has an angle θ1 with the X axis in the coordinate system Xo1Y (θ1 is the azimuth angle of a straight line formed by the wireless signal propagation path from the passive RFID tag 11 to the pointing antenna 1200 connected thereto in the coordinate system Xo 1Y). The pointing antenna 1200 in the coordinate system Xo2Y connected to the current passive RFID tag 11 has an angle θ2 with the X axis in the coordinate system Xo2Y (θ2 is the azimuth angle of a straight line formed by the wireless signal propagation path from the passive RFID tag 11 to the pointing antenna 1200 connected thereto in the coordinate system Xo 2Y). The angles θ1 and θ2 are known (e.g., one pointing antenna 1200 may be aligned with the X-axis in the coordinate system Xo1Y, and then the angles between the pointing antennas 1200 may be added to obtain θ1.θ2, which may be obtained by a similar method).

Let the intersection point coordinates of the propagation path of the radio signal directed to the antenna 1200 in the coordinate system Xo1Y and the propagation path of the radio signal directed to the antenna 1200 in the coordinate system Xo2Y be defined as (x 1, Y1) in the coordinate system Xo1Y and as (x 2, Y2) in the coordinate system Xo2Y, and the intersection point coordinates (x 1, Y1) and the intersection point coordinates (x 2, Y2) are all to be calculated (the intersection point coordinates (x 1, Y1) and the intersection point coordinates (x 2, Y2) are coordinate expressions of the same intersection point in different coordinate systems). The intersection coordinates (x 1, Y1) can establish a linear equation in the coordinate system Xo 1Y: y1=tan θ1x1. The intersection coordinates (x 2, Y2) can establish a linear equation in the coordinate system Xo 2Y: y2=tanθ2x2. A linear equation can be established from the distances of the origin (Xo 1, yo 1) and the origin (Xo 2, yo 2) in the x-axis direction: the linear equation can be established from the distance of origin (Xo 1, yo 1) and origin (Xo 2, yo 2) in the y-axis direction by |xo1-xo2|= |x1-xo1|+|x2-xo2|. |yo1-yo2|= |y1-yo1| -y2-yo2|. Then according to the system of linear equations:

the intersection point coordinates (x 1, y 1) and the intersection point coordinates (x 2, y 2) can be solved.

Similarly, when the origin O3 of the other reader 12 different from the two readers 12 is taken as the origin of coordinates, and a rectangular coordinate system Xo3Y is established, the wireless signal propagation path of the pointing antenna 1200 (in the coordinate system Xo3Y, the azimuth angle of the line formed by the wireless signal propagation path from the passive RFID tag 11 to the pointing antenna 1200 connected thereto is θ3) connected to the other reader 12 and the wireless signal propagation path of the pointing antenna 1200 in the coordinate system Xo1Y and the coordinate system Xo2Y can be intersected respectively, two intersection points are formed, the calculation method of the coordinates of the two intersection points can refer to the calculation of the coordinates of the intersection points, and after the calculation of the coordinates of the three intersection points is completed, the coordinates of the current passive RFID tag 11 can be obtained by averaging.

The more readers 12 are connected with the current passive RFID tag 11, the more accurate the positioning of the current passive RFID tag 11 is, because the more readers 12 are connected with the current passive RFID tag 11, the more directional antennas 1200 are provided and the more wireless signal propagation paths are provided by the respective connected directional antennas 1200, and the coordinate of the current passive RFID tag 11 can be made to be closer to the actual coordinate after all the intersection points are averaged. Since the above equation is a linear equation, the calculation in this embodiment is simpler than the prior art in which a quadratic equation is used to calculate the distance between the reader 12 and the electronic tag for positioning. The above embodiment is calculated by taking the case when the reader 12 and the current passive RFID tag 11 are relatively stationary as an example, and when the reader 12 and the current passive RFID tag 11 are relatively moved, the speed of the relative movement of the reader 12 and the current passive RFID tag 11 is only known, and the person skilled in the art can still use the above equation to dynamically locate the current passive RFID tag 11.

As shown in fig. 6, in another embodiment, there is provided a radio frequency identification tag positioning apparatus 2 including: a search unit 20 and a position calculation unit 21. The searching unit 20 is configured to search all the directional antennas 1200 in the plurality of readers 12 connected to the current passive RFID tag 11 according to the received wireless signal transmitted by the passive RFID tag 11. The position calculating unit 21 is configured to calculate the position of the current passive RFID tag 11 according to the included angle between each adjacent directional antenna 1200 in the plurality of readers 12 and the coordinates of the current passive RFID tag 11 with respect to the origin of all directional antennas 1200 (particularly all directional antennas 1200 connected to the passive RFID tag 11).

In another embodiment, a storage medium having computer readable instructions stored thereon, which when executed by a computer, cause the computer to perform the rfid tag locating method of the previous embodiment is provided. The storage medium may include: read Only Memory (ROM), random access Memory (RAM, random Access Memory), hard disk, optical disk, or the like.

The system, method, apparatus and storage medium for positioning an rfid tag provided in the embodiments of the present application have been described in detail, and those skilled in the art will appreciate that the scope of the embodiments and applications of the present application may be modified according to the concepts of the embodiments of the present application. In view of the foregoing, it is intended that the present disclosure not be limited to the embodiments described herein, but that all equivalent modifications and variations according to the spirit and technical ideas of the present disclosure be covered by the claims of the present disclosure.

Claims

1. A radio frequency identification tag locating system, comprising:

a power supply device for generating an alternating magnetic field;

a passive RFID tag comprising a receiving end that generates an induced current based on the alternating magnetic field and a transmitting antenna that starts and transmits a wireless signal based on the induced current;

at least three readers, each of the readers comprising:

an antenna device comprising a plurality of directional antennas and a plurality of baffle devices, each directional antenna being separated by two adjacent baffle devices, the directional antennas being configured to receive the wireless signals transmitted by the passive RFID tag in a specific direction; and

and the processor is electrically connected with the at least three readers, and the processor is used for positioning the passive RFID tag based on the fact that the at least three readers receive the wireless signals transmitted by the same passive RFID tag.

2. The rfid tag locating system of claim 1, wherein the plurality of directional antennas of the antenna assembly are arranged in a circle and define a center, the plurality of baffle assemblies are referenced to the center to divide the circle into a plurality of gratings, and one end of each baffle assembly is connected to the center.

3. The radio frequency identification tag locating system of claim 2, wherein one end of each of said directional antennas is connected to said center of a circle, and the other end of each of said directional antennas is configured to receive said wireless signal emitted by said passive RFID tag into a corresponding grid.

4. The rfid tag locating system of claim 1, wherein the receiving end and the transmitting antenna are co-formed.

5. The rfid tag locating system of claim 1, wherein the power supply means includes a transmitting end resonator for generating the alternating magnetic field; the receiving end comprises a receiving end resonator, and the transmitting end resonator and the receiving end resonator provide the power of the power supply device for the passive RFID tag through magnetic coupling resonance.

6. A radio frequency identification tag locating method applied to a radio frequency identification tag locating system according to any one of claims 1 to 5, comprising the steps of:

searching all directional antennas in a plurality of readers connected with the current passive RFID tag according to the received wireless signals transmitted by the passive RFID tag; and

and calculating the position of the current passive RFID tag according to the included angle between each adjacent directional antenna in the plurality of readers and the coordinates of the current passive RFID tag relative to the origin of all the directional antennas.

7. The method of claim 6, wherein the step of calculating the position of the current passive RFID tag based on the angle between each adjacent one of the plurality of readers and the coordinates of the current passive RFID tag with respect to the origin of all the plurality of pointing antennas comprises:

generating a linear equation according to the included 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

and calculating coordinate values of the current passive RFID tag according to each linear equation.

8. The method of positioning a radio frequency identification tag of claim 6, further comprising: and starting a power supply device to provide an alternating magnetic field for the passive RFID tag so that the passive RFID tag generates an induction current and emits a wireless signal based on the alternating magnetic field.

9. A radio frequency identification tag locating device, comprising:

the searching unit is used for searching all pointing antennas in a plurality of readers connected with the current passive RFID tag according to the received wireless signals transmitted by the passive RFID tag; and

and the position calculation unit is used for calculating the position of the current passive RFID tag according to the included angle between each adjacent directional antenna in the plurality of readers and the coordinates of the current passive RFID tag relative to the origin of all the directional antennas.

10. A storage medium having stored thereon computer readable instructions which, when executed by a computer, cause the computer to perform the radio frequency identification tag locating method of claim 6.