Label reading method and device, storage medium and electronic equipment

Abstract

The invention discloses a tag reading method and device, a storage medium and electronic equipment, and relates to the technical field of radio frequency identification, and the method comprises the steps: obtaining an initial polarization direction angle of a radio frequency signal transmitted by a dual-polarization antenna in a reader-writer based on the initial setting of the reader-writer; then, based on the initial polarization direction angle, adjusting the polarization direction angle of the radio frequency signal transmitted by the dual-polarized antenna by respectively adjusting the power and phase relation of the radio frequency signal transmitted by two linearly polarized antennas in the dual-polarized antenna; and under the condition that the variation of the polarization direction angle reaches a preset variation angle each time, executing at least one time of tag identification, and recording read tag information. Compared with the prior art, by dynamically and continuously adjusting the polarization direction of the dual-polarized antenna, adaptive polarization matching of tags in different postures and directions is realized, signal attenuation caused by polarization mismatching is effectively reduced, and the stability and coverage range of the system in a complex electromagnetic environment are improved.

Description

Technical Field

[0001] This application relates to the field of radio frequency identification technology, specifically to a tag reading method, device, storage medium, and electronic device. Background Technology

[0002] Radio Frequency Identification (RFID) is a wireless communication technology that uses radio frequency to read and write recording media (such as electronic tags), enabling contactless two-way data communication. It is an important component of the Internet of Things (IoT). An RFID system may include RFID tags, RFID readers, and a back-end management system.

[0003] Currently, RFID readers typically use circularly polarized antennas to receive and transmit signals to avoid polarization mismatch caused by random tag orientation. However, due to the superposition of biorthogonal linearly polarized waves in circular polarization, only the signal component aligned with the tag's polarization direction can be received by the tag during communication. The signal component orthogonal to the tag's polarization direction suffers from polarization isolation, resulting in a loss of transmitted signal power and a shorter effective transmission distance for the radio frequency signal. Summary of the Invention

[0004] In view of this, this application provides a tag reading method, apparatus, storage medium and electronic device, the main purpose of which is to improve the technical problem that the current circular polarization method causes loss of transmitted signal power, resulting in a short effective transmission distance of the transmitted radio frequency signal.

[0005] Firstly, this application provides a tag reading method, including:

[0006] Based on the initial settings of the reader, the initial polarization direction angle of the radio frequency signal transmitted by the dual-polarized antenna in the reader is obtained;

[0007] Based on the initial polarization direction angle, the polarization direction angle of the radio frequency signal transmitted by the dual-polarized antenna is adjusted by respectively adjusting the power and phase relationship of the radio frequency signals transmitted by the two linearly polarized antennas in the dual-polarized antenna;

[0008] Each time the change in the polarization direction angle reaches a preset change angle, at least one tag recognition is performed, and the read tag information is recorded.

[0009] Secondly, this application provides a tag reading system, including:

[0010] The reader / writer includes a dual-polarized antenna composed of two mutually orthogonal linearly polarized antennas;

[0011] The controller is used to obtain the initial polarization direction angle of the radio frequency signal transmitted by the dual-polarized antenna in the reader based on the initial settings of the reader; based on the initial polarization direction angle, the controller adjusts the polarization direction angle of the radio frequency signal transmitted by the dual-polarized antenna by adjusting the power and phase relationship of the radio frequency signals transmitted by the two linearly polarized antennas in the dual-polarized antenna respectively; and when the change in polarization direction angle reaches a preset change angle each time, the controller performs at least one tag identification and records the tag information read.

[0012] Thirdly, this application provides a tag reading device, comprising:

[0013] The acquisition module is configured to acquire the initial polarization direction angle of the radio frequency signal transmitted by the dual-polarized antenna in the reader based on the initial settings of the reader;

[0014] The adjustment module is configured to adjust the polarization direction angle of the radio frequency signal transmitted by the dual-polarized antenna based on the initial polarization direction angle by adjusting the power and phase relationship of the radio frequency signals transmitted by the two linearly polarized antennas in the dual-polarized antenna respectively;

[0015] The identification module is configured to perform at least one tag identification and record the read tag information each time the change in the polarization direction angle reaches a preset change angle.

[0016] Fourthly, this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method described in the first aspect.

[0017] Fifthly, this application provides an electronic device including a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, wherein the processor executes the computer program to implement the method described in the first aspect.

[0018] In a sixth aspect, this application provides a computer program product having a computer program stored thereon, which, when executed by a processor, implements the method described in the first aspect.

[0019] By employing the above technical solution, this application provides a tag reading method, apparatus, storage medium, and electronic device. First, based on the initial settings of the reader, the initial polarization direction angle of the radio frequency signal transmitted by the dual-polarized antenna in the reader is obtained. Then, based on the initial polarization direction angle, the polarization direction angle of the transmitted radio frequency signal is adjusted by separately adjusting the power and phase relationship of the radio frequency signals transmitted by the two linearly polarized antennas in the dual-polarized antenna. Each time the change in polarization direction angle reaches a preset change angle, at least one tag identification is performed, and the read tag information is recorded. Compared with existing technologies, this application, by dynamically and continuously adjusting the polarization direction of the dual-polarized antenna, can achieve adaptive polarization matching for tags with different postures and orientations without changing the physical position of the reader or adding mechanical structures. This significantly improves the tag recognition rate and system robustness, balances the advantages of long-distance transmission with multi-directional tag recognition capabilities, effectively reduces signal attenuation caused by polarization mismatch, and improves the system's stability and coverage in complex electromagnetic environments.

[0020] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A flowchart illustrating a tag reading method provided in an embodiment of this application is shown;

[0024] Figure 2 A schematic diagram illustrating an example provided in an embodiment of this application is shown;

[0025] Figure 3 A schematic diagram illustrating an example provided in an embodiment of this application is shown;

[0026] Figure 4 A schematic diagram illustrating an example provided in an embodiment of this application is shown;

[0027] Figure 5A flowchart illustrating another tag reading method provided in an embodiment of this application is shown;

[0028] Figure 6 A schematic diagram illustrating an example provided in an embodiment of this application is shown;

[0029] Figure 7 A schematic diagram illustrating an example provided in an embodiment of this application is shown;

[0030] Figure 8 A schematic diagram illustrating an example provided in an embodiment of this application is shown;

[0031] Figure 9 A schematic diagram illustrating an example provided in an embodiment of this application is shown;

[0032] Figure 10 This paper shows a schematic diagram of the structure of a tag reading system provided in an embodiment of this application;

[0033] Figure 11 A schematic diagram of the structure of a tag reading device provided in an embodiment of this application is shown. Detailed Implementation

[0034] The embodiments of this application will now be described in more detail with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0035] Electromagnetic wave polarization refers to the orientation and time-varying pattern of the electric field vector of an electromagnetic wave as it propagates through space. The polarization direction of an electromagnetic wave is the direction of its electric field vibration. Different polarization direction patterns represent different polarization modes, which can be classified into three types: linear polarization, circular polarization, and elliptical polarization. The electric field of a linearly polarized wave vibrates along a single, specific direction, generally exhibiting vertical and horizontal polarization. The superposition of two orthogonal linearly polarized waves with the same amplitude and a 90° phase difference forms a circularly polarized wave, whose electric field vector moves in a circle around the axis of propagation. Based on the relative phases of the two waves, it is classified as left-handed or right-handed circularly polarized waves. When two orthogonal linearly polarized waves have different amplitudes and phases, their superposition forms an elliptical polarized wave.

[0036] Antennas can also be classified into three types based on the polarization of the electromagnetic waves they radiate: linearly polarized antennas, circularly polarized antennas, and elliptically polarized antennas. An antenna can only receive signal components with the same polarization direction as its own. Therefore, the amount of signal energy received by an antenna depends on both the polarization direction of the incoming wave and the polarization direction of the receiving antenna. When the polarization directions are perfectly aligned, the received signal energy is maximized; this is called polarization matching. When the directions are not aligned, a portion of the signal energy orthogonal to the antenna's polarization direction cannot be received by the antenna, resulting in reduced received signal energy and polarization loss. When the directions are perfectly orthogonal, the antenna cannot receive any signal energy at all, and the polarization loss reaches its maximum; this is called polarization isolation.

[0037] For example, using a vertically polarized antenna to receive a horizontally polarized wave, or using a left-hand circularly polarized antenna to receive a right-hand circularly polarized wave, will result in polarization isolation. However, a circularly polarized antenna can receive linearly polarized waves in any direction, and its radiated circularly polarized waves can also be received by a linearly polarized antenna in any direction. This is because a circularly polarized wave is a superposition of two orthogonal linearly polarized waves, and always has a component in the corresponding linear polarization direction.

[0038] Furthermore, based on the vibration mode of the electric field vector when the antenna radiates electromagnetic waves and its ability to simultaneously handle mutually orthogonal polarized waves, antennas can also be classified into single-polarized antennas and dual-polarized antennas. A single-polarized antenna can only handle a single polarization direction at a time, while a dual-polarized antenna can simultaneously radiate or receive two mutually orthogonal polarized waves. Generally, a dual-polarized antenna combines two orthogonal, independent single-polarized antennas into a single unit, such as a V / H (vertical / horizontal) dual-polarized antenna or a ±45° dual-polarized antenna.

[0039] In some examples, an RFID system may include three parts:

[0040] 1. RFID Tags: These are electronic tags containing microchips and antennas. They enable data storage and communication functions with a very small device size. Some also integrate sensors to monitor environmental conditions. RFID tags are divided into active tags and passive tags. Active tags have an independent power supply system and can actively transmit signals; while passive tags have no power supply and need to absorb the radio frequency signal energy emitted by the reader to work.

[0041] 2. RFID reader: A device that transmits radio frequency signals to activate tags and reads or writes data into the tags.

[0042] 3. Back-end management system: Receives tag data from the reader, stores, processes, and analyzes it to achieve real-time tracking and management of the tags.

[0043] In some examples, to reduce size and cost for mass deployment, general RFID tags often use relatively simple linearly polarized antennas as their transceiver antennas. This can result in excessive polarization loss, potentially causing the reader to fail to read the data. In some specialized applications such as factory production, readers may use linearly polarized antennas to achieve longer signal transmission distances. However, these applications often require the tags and readers to be deployed in fixed locations or rely on mechanical adjustments to align the polarization direction, severely limiting the applicability of linearly polarized antennas.

[0044] To address the technical problem of power loss in transmitted signals caused by current circular polarization methods, resulting in a short effective transmission distance for radio frequency signals, this embodiment provides a tag reading method, such as... Figure 1 As shown, the method includes:

[0045] Step 101: Based on the initial settings of the reader, obtain the initial polarization direction angle of the radio frequency signal transmitted by the dual-polarized antenna in the reader.

[0046] In some examples, the reader antenna is a dual-polarized antenna composed of two mutually orthogonal linearly polarized antennas. Both antennas transmit the same signal, but the amplitude and phase relationship of the signal can be independently adjusted by the control module. This allows for the synthesis of a linearly polarized signal with a freely quantifiable polarization direction at a given total transmit power. When communicating with tags, the reader can determine and automatically adjust the polarization direction to achieve better wireless transmission performance.

[0047] For example, when starting tag identification, the reader first sets the antenna polarization angle θ to an arbitrary initial value (such as 0°), and then gradually adjusts the power and phase relationship to change the value of θ, causing the polarization direction to rotate. This initial polarization angle reflects the spatial orientation of the electric field vector of the antenna in the startup or initialization state, and is the basic reference parameter for subsequent polarization matching optimization, signal strength enhancement, and adjustment of the transmitted signal direction.

[0048] Step 102: Based on the initial polarization direction angle, adjust the polarization direction angle of the radio frequency signal transmitted by the dual-polarized antenna by adjusting the power and phase relationship of the radio frequency signals transmitted by the two linearly polarized antennas in the dual-polarized antenna respectively.

[0049] For example, as shown in Figure 2, the dual-polarized reader antenna consists of two orthogonally polarized antennas, a and b. Here, we use a ±45° dual-polarized antenna, and set the horizontal direction to the right as 0°. The reader can simultaneously transmit the same signal from antennas a and b, forming polarization angles of [insert polarization angles here]. and Two mutually orthogonal linearly polarized waves, xa(t) and xb(t), with the same frequency ω:

[0050]

[0051] For example, such as Figure 3 As shown, superimposing these two linearly polarized waves can synthesize them into a single linearly polarized wave x(t) with amplitude A and polarization direction angle θ:

[0052]

[0053] Its amplitude A is determined by vector synthesis of the amplitudes Aa and Ab of xa(t) and xb(t):

[0054]

[0055]

[0056] In some examples, while keeping the total transmit power constant, the required amplitude ratio and phase difference of the two signals can be calculated based on the angle difference between the target polarization direction and the initial direction. The transmit power of each channel can be adjusted by the power control module, and the signal phase can be adjusted by the in-phase / out-of-phase control module, so that the synthesized polarization direction can be accurately rotated to the target angle, thereby realizing the continuous adjustment of the polarization direction angle of the transmitted radio frequency signal of the dual-polarized antenna.

[0057] Step 103: When the change in polarization direction angle reaches the preset change angle each time, perform tag recognition at least once and record the tag information read.

[0058] For example, tag information may include tag ID, signal strength, and corresponding polarization direction angle, so as to realize dynamic acquisition and analysis of tag response characteristics under different polarization postures.

[0059] For example, such as Figure 4 As shown, in the operation of an RFID system, the reader first emits a wireless signal of a specific frequency to locate tags within the target range. Upon receiving the signal from the reader, the tag, based on its active or passive category, activates itself by absorbing signal energy or relying on a power source, and returns a signal carrying its own ID information to the reader. Based on this, the reader can identify the tags within the range, establish a connection with them, and then send read / write commands to the corresponding tags to access their stored data, thus achieving communication with the tags. In particular, high-frequency (HF) and ultra-high-frequency (UHF) passive RFID systems primarily use electromagnetic backscatter coupling for communication, with a reading range generally exceeding tens of centimeters, and support one-to-many data transmission modes, thus enabling batch inventory of multiple tags within the range.

[0060] Compared with existing technologies, the technical solution of this embodiment first obtains the initial polarization direction angle of the radio frequency signal transmitted by the dual-polarized antenna in the reader based on the initial settings of the reader; then, based on the initial polarization direction angle, the polarization direction angle of the radio frequency signal transmitted by the dual-polarized antenna is adjusted by adjusting the power and phase relationship of the radio frequency signals transmitted by the two linearly polarized antennas in the dual-polarized antenna; each time the change in polarization direction angle reaches a preset change angle, at least one tag identification is performed, and the read tag information is recorded. This embodiment, by dynamically and continuously adjusting the polarization direction of the dual-polarized antenna, can achieve adaptive polarization matching for tags with different postures and orientations without changing the physical position of the reader or adding mechanical structures, significantly improving the tag recognition rate and system robustness, taking into account the advantages of long-distance transmission and multi-directional tag identification capabilities, effectively reducing signal attenuation caused by polarization mismatch, and improving the stability and coverage of the system in complex electromagnetic environments.

[0061] To further illustrate the specific implementation process of the method in this embodiment, this embodiment provides the following: Figure 5 The specific method shown includes:

[0062] Step 201: Obtain the total transmit power of the radio frequency signal transmitted by the dual-polarized antenna and the angle of the first polarization direction.

[0063] The polarization direction corresponding to the first polarization direction angle is the reference direction for the current transmitted radio frequency signal of the dual-polarized antenna, and the first polarization direction angle can be the initial polarization direction angle.

[0064] Step 202: Determine the second polarization direction angle based on the first polarization direction angle and the preset change angle.

[0065] For example, the second polarization direction angle can be determined based on the first polarization direction angle and the preset change angle. First, the first polarization direction angle of the dual-polarized antenna needs to be determined, which is the spatial orientation of the antenna's transmitted radio waves measured relative to a certain reference direction. Then, a preset change angle is set, which is used to adjust the antenna's direction to optimize communication performance. This change angle can be positive or negative, representing clockwise or counterclockwise rotation, respectively. Then, the preset change angle is added to the first polarization direction angle to calculate the second polarization direction angle, ensuring that the calculation result falls within the range of 0 degrees to 360 degrees.

[0066] Step 203: Based on the total transmit power and phase relationship, rotate and adjust the transmitted radio frequency signal of the dual-polarized antenna from the first polarization direction angle to the second polarization direction angle.

[0067] For example, such as Figure 6As shown, the antenna polarization direction control system of a reader in this embodiment includes three modules: dual-polarized antenna, in-phase / out-of-phase control, and power control. When the reader needs to change the polarization direction, it first inverts the transmitted signal of the corresponding antenna according to the value of the target polarization direction angle θ in the in-phase / out-of-phase control module. Then, based on the given total antenna power P, it calculates and sets the respective transmitted powers PA and PB of the two antennas through the power control module. Thus, the reader antennas A and B can transmit two linearly polarized waves with orthogonal directions and different amplitudes, and synthesize a linearly polarized wave with a constant power P but an arbitrarily changeable polarization direction θ.

[0068] In some examples, continuous adjustment of the polarization direction can be achieved by controlling the power distribution and phase difference between two orthogonal polarization channels (such as vertical and horizontal polarization). Specifically, based on the difference between the target second polarization direction angle and the first polarization direction angle, the required electric field component amplitude ratio and relative phase are calculated. The power control module adjusts the transmission power of the two channels, while the phase of the signal is switched or adjusted in the in-phase or out-of-phase control module, so that the equivalent electric field direction after the synthesis of the two orthogonal linear polarized waves points precisely to the second polarization direction angle, thereby achieving smooth rotation and orientation control of the polarization direction.

[0069] Optionally, step 203 may specifically include: setting the first transmission power corresponding to the first linearly polarized antenna and the second transmission power corresponding to the second linearly polarized antenna in the dual-polarized antenna based on the total transmission power and the preset change angle.

[0070] For example, since the polarization directions of antennas a and b are fixed (45° and -45°) and orthogonal to each other, the relationship between the polarization direction angle θ of the synthesized linearly polarized wave x(t) and the amplitude can also be obtained from geometric relationships (Note: the value of the angle added to θ in this relationship is related to the direction set at 0°):

[0071]

[0072] The power of a signal can be obtained from its amplitude:

[0073]

[0074] Therefore, the power of the two linearly polarized waves xa(t) and xb(t) and their synthesized linearly polarized wave x(t) satisfy the following relationship:

[0075] P = P a +P b

[0076] Therefore, the total power of the transmitted signal of a dual-polarized antenna is equal to the sum of the power of the transmitted signals of the two linearly polarized antennas.

[0077] In some examples, based on the total transmit power of the dual-polarized antenna and the preset change angle, the adjustment requirement of the target polarization direction relative to the initial direction can be determined first. The amplitude ratio required for the two orthogonal polarization components can be calculated according to the preset change angle. Then, while keeping the total transmit power constant, the first transmit power and the second transmit power required for the first linear polarized antenna and the second linear polarized antenna can be calculated respectively using the power allocation relationship. The calculated power values ​​are then allocated to the corresponding antenna channels through the power control module, thereby achieving precise adjustment of the polarization direction.

[0078] Optionally, step 203 may further include: processing the transmitted radio frequency signals of the first linearly polarized antenna and the second linearly polarized antenna into phase or out of phase, respectively, according to the range of the second polarization direction angle.

[0079] For example, in practical applications, the total power P of the signal transmitted by the reader needs to be actively set. To adjust the polarization direction of the synthesized wave x(t) to θ, the powers Pa and Pb of antennas a and b need to be set separately to satisfy certain numerical relationships. Pa and Pb can be derived from the formulas above:

[0080]

[0081] In some examples, considering that amplitude A, as a scalar, has no directionality and is always non-negative, it cannot reflect the situation where the amplitudes of the two antenna signals are opposite in sign. Therefore, simply adjusting the power is insufficient to synthesize linearly polarized waves in all polarization directions. Thus, it is necessary to apply an additional phase control to the signals transmitted by the two antennas. Based on different ranges of polarization direction angle θ, the signals of the corresponding antennas are inverted, thus reversing the polarization directions of the two antennas.

[0082]

[0083] For example, such as Figure 7 As shown, based on the relationship between the phase difference of the two antenna signals and the range of θ values ​​(e.g., a+b- represents xa(t) in phase and xb(t) in phase), the transmitted radio frequency signals of the first and second linearly polarized antennas can be processed to be in phase or out of phase respectively.

[0084] In some examples, the signal transmission performance of the dual-polarized antenna in this embodiment can be compared with that of a circularly polarized antenna. The circularly polarized wave emitted by a circularly polarized antenna can be decomposed into two linearly polarized waves with equal power, polarization directions aligned with and orthogonal to the tag antenna, and a phase difference of 90°. Only the linearly polarized wave component aligned with the tag antenna's polarization direction can be received by the tag antenna. According to the power superposition relationship, the effective transmit power of the circularly polarized antenna is always only half of the total power. The effective transmit power of this dual-polarized antenna is minimum when the polarization direction angle θ matched with the tag is an even multiple of π / 4 (i.e., at the angle bisector of the two antenna polarization directions), being half of the total power; and maximum when θ is an odd multiple of π / 4 (i.e., aligned with the polarization direction of either antenna), equal to the total power P. It is evident that the power performance of this dual-polarized antenna is significantly improved compared to that of the circularly polarized antenna. When used in RFID readers, at the same power, the tag recognition and reading distance will be farther than that of the circularly polarized antenna reader.

[0085] Step 204: When the change in polarization direction angle reaches the preset change angle each time, perform tag recognition at least once and record the tag information read.

[0086] Optionally, step 204 may specifically include: transmitting an radio frequency signal to identify tags within the polarization direction coverage area each time the change in polarization direction angle reaches a preset change angle; and recording the identified tag information and the corresponding polarization direction angle in the background management system.

[0087] For example, during the tag identification process, tags within the target range often have uncertain orientations. This leads to the single polarization direction of the reader antenna easily missing tags with insufficient polarization direction matching. Therefore, as... Figure 8 As shown, this embodiment proposes an omnidirectional tag identification method based on the aforementioned reader / writer. When identifying tags, the reader / writer antenna automatically adjusts its polarization direction to achieve omnidirectional identification. When tag identification begins, the reader / writer first sets the antenna polarization angle θ to an arbitrary initial value (e.g., 0°), then gradually adjusts the power and phase relationship to change the value of θ, causing the polarization direction to rotate. From the initial value, a tag identification is performed every time θ changes by Δθ (the magnitude of Δθ can be set as needed to achieve different identification accuracies), and the identified tag ID information is entered into the management system. With the alternation of rotating the polarization direction and transmitting identification signals, the reader / writer can achieve omnidirectional batch identification of tags over a larger area with a highly matched polarization direction.

[0088] Optionally, the method in this embodiment may further include: sending a read / write command to the target tag each time the change in polarization direction angle reaches a preset change angle; receiving the received signal strength indication value and the current polarization direction angle in the returned signal from the target tag each time; and filtering out the target polarization direction angle corresponding to the target tag from the multiple polarization direction angles by comparing the received signal strength indication values ​​corresponding to the multiple polarization direction angles and recording it in the database.

[0089] In some embodiments, some tag identification methods can achieve communication between the reader and multiple tags over a wide range. However, when reading or writing to a specific tag, it cannot be guaranteed that the polarization direction will always remain in the direction matching the tag. Therefore, this embodiment also includes an automatic tag polarization direction matching method based on the aforementioned reader, enabling the reader to find the polarization direction with the highest matching degree with the target tag based on the Received Signal Strength Indicator (RSSI) of the returned signal, thereby improving signal transmission quality and enhancing system robustness.

[0090] For example, such as Figure 9 As shown, the reader rotates the antenna polarization angle θ from its initial value. During this rotation, it waits for a return signal after each read / write command signal is sent, continuing until a return signal is received or the waiting time reaches a certain threshold before proceeding with the next rotation and signal transmission. Each time the reader receives a tag return signal, the management system obtains the RSSI of that signal and the current antenna polarization angle θ, recording them in the database. If the current RSSI is greater than the value already recorded in the database, the RSSI and θ values ​​are updated. This process is repeated until the polarization direction completes a full rotation and returns to its initial angle. The θ value recorded in the database at this point represents the optimal polarization angle. Setting θ to this value minimizes the impact of interference factors such as changes in the reader or tag's position and attitude, and changes in the channel environment on stable signal transmission.

[0091] For example, in actual operation, linearly polarized antenna readers may miss tags when identifying or reading / writing tags due to differences in polarization direction, which is detrimental to tag identification and reading / writing in dynamically deployed environments. The dual-polarized antenna reader proposed in this embodiment can continuously and automatically adjust the polarization direction when identifying tags, completing omnidirectional tag identification over a wide range, thus ensuring no tags are missed. When reading / writing specific tags, it can automatically adjust the polarization direction to a suitable angle based on the differences in Received Signal Strength Indicator (RSSI) for communication with the tag under different polarization directions, thereby maintaining a continuous connection with the tag.

[0092] Compared with existing technologies, this embodiment uses a dual-polarized antenna in the RFID reader and combines signal power and phase adjustment algorithms to dynamically adjust the polarization direction of the antenna. Compared with commonly used circularly polarized antennas, it can achieve better polarization matching at the same transmission power, effectively reducing signal loss when receiving at the tag end, thereby improving transmission performance and extending the working distance. At the same time, it can flexibly change the polarization direction without relying on fixed installation position or mechanical adjustment. It retains the advantage of long transmission distance of linearly polarized antennas and overcomes their disadvantage of difficult polarization matching, significantly improving the flexibility of system deployment and the reliability of identification.

[0093] Furthermore, as Figure 1 and Figure 5 The specific implementation of the method shown in this embodiment provides a tag reading system, such as... Figure 10 As shown, it includes: reader 31 and controller 32.

[0094] The reader 31 includes a dual-polarized antenna composed of two mutually orthogonal linearly polarized antennas;

[0095] The controller 32 is used to obtain the initial polarization direction angle of the radio frequency signal transmitted by the dual-polarized antenna in the reader based on the initial settings of the reader; based on the initial polarization direction angle, the polarization direction angle of the radio frequency signal transmitted by the dual-polarized antenna is adjusted by adjusting the power and phase relationship of the radio frequency signals transmitted by the two linearly polarized antennas in the dual-polarized antenna respectively; when the change in polarization direction angle reaches a preset change angle each time, at least one tag identification is performed and the read tag information is recorded.

[0096] Optionally, the controller 32 may include a power control module; the power control module is used to set the first transmission power corresponding to the first linearly polarized antenna and the second transmission power corresponding to the second linearly polarized antenna in the dual-polarized antenna based on the total transmission power and the preset change angle.

[0097] Optionally, the controller 32 may further include an in-phase / out-of-phase control module; the in-phase / out-of-phase control module is used to process the transmitted radio frequency signals of the first linearly polarized antenna and the second linearly polarized antenna into in-phase or out-of-phase signals respectively according to the range of polarization direction angle.

[0098] Furthermore, as Figure 1 and Figure 5 To illustrate the specific implementation of the method shown, this embodiment provides a tag reading device, such as... Figure 11 As shown, the device includes: an acquisition module 41, an adjustment module 42, and an identification module 43.

[0099] The acquisition module 41 is configured to acquire the initial polarization direction angle of the radio frequency signal transmitted by the dual-polarized antenna in the reader based on the initial settings of the reader;

[0100] The adjustment module 42 is configured to adjust the polarization direction angle of the radio frequency signal transmitted by the dual-polarized antenna by adjusting the power and phase relationship of the radio frequency signals transmitted by the two linearly polarized antennas in the dual-polarized antenna, based on the initial polarization direction angle.

[0101] The identification module 43 is configured to perform at least one tag identification and record the read tag information each time the change in the polarization direction angle reaches a preset change angle.

[0102] In some examples of this embodiment, the adjustment module 42 is further configured to obtain the total transmission power of the radio frequency signal transmitted by the dual-polarized antenna and the first polarization direction angle; determine the second polarization direction angle based on the first polarization direction angle and the preset change angle; and rotate and adjust the radio frequency signal transmitted by the dual-polarized antenna from the first polarization direction angle to the second polarization direction angle based on the total transmission power and the phase relationship.

[0103] In some examples of this embodiment, the adjustment module 42 is further configured to set the first transmission power corresponding to the first linearly polarized antenna and the second transmission power corresponding to the second linearly polarized antenna in the dual-polarized antenna based on the total transmission power and the preset change angle.

[0104] In some examples of this embodiment, the adjustment module 42 is further configured to process the transmitted radio frequency signals of the first linearly polarized antenna and the second linearly polarized antenna into phase or out of phase according to the range of the second polarization direction angle.

[0105] In some examples of this embodiment, the identification module 43 is further configured to transmit a radio frequency signal to identify the tag within the polarization direction coverage area each time the change in the polarization direction angle reaches a preset change angle; and to record the identified tag information and the corresponding polarization direction angle in the background management system.

[0106] In some examples of this embodiment, the identification module 43 is further configured to send a read / write instruction to the target tag each time the change in the polarization direction angle reaches a preset change angle; receive the received signal strength indication value and the current polarization direction angle in the returned signal of the target tag each time; and filter out the target polarization direction angle corresponding to the target tag from the multiple polarization direction angles by comparing the received signal strength indication values ​​corresponding to the multiple polarization direction angles and record it in the database.

[0107] It should be noted that for other corresponding descriptions of the various functional units involved in the tag reading device provided in this embodiment, please refer to... Figure 1 and Figure 5 The corresponding descriptions in [the document] will not be repeated here.

[0108] Based on the above, Figure 1 and Figure 5 Accordingly, this embodiment also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-described method. Figure 1 and Figure 5 The method shown.

[0109] Based on this understanding, the technical solution of this application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as CD-ROM, USB flash drive, mobile hard drive, etc.) and includes several instructions to cause a computer device (such as personal computer, server, or network device, etc.) to execute the methods of various implementation scenarios of this application.

[0110] Based on the above, Figure 1 and Figure 5 The method shown, and Figure 11 To achieve the above objectives, the present application also provides an electronic device, such as a personal computer, server, laptop computer, intelligent robot, or other intelligent terminal, as illustrated in the virtual device embodiment. This device includes a storage medium and a processor; the storage medium stores a computer program; the processor executes the computer program to implement the above-described virtual device. Figure 1 and Figure 5 The method shown.

[0111] Optionally, the aforementioned physical devices may also include a user interface, a network interface, a camera, radio frequency (RF) circuitry, sensors, audio circuitry, a Wi-Fi module, etc. The user interface may include a display screen, input units such as a keyboard, etc., and optional user interfaces may also include USB interfaces, card reader interfaces, etc. The network interface may optionally include standard wired interfaces, wireless interfaces (such as Wi-Fi interfaces), etc.

[0112] Those skilled in the art will understand that the physical device structure provided in this embodiment does not constitute a limitation on the physical device, and may include more or fewer components, or combine certain components, or have different component arrangements.

[0113] The storage medium may also include an operating system and a network communication module. The operating system is a program that manages the hardware and software resources of the aforementioned physical device, supporting the operation of information processing programs and other software and / or programs. The network communication module is used to enable communication between the various components within the storage medium, as well as communication with other hardware and software in the information processing physical device.

[0114] Through the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary general-purpose hardware platforms, or it can be implemented by hardware. By applying the solution of this embodiment, compared with the existing technology, this embodiment is based on a dual-polarized antenna RFID reader with adjustable polarization direction, including three modules: dual-polarized antenna, in-phase / out-of-phase control, and power control. By adjusting the transmission power and phase relationship of the two orthogonal linearly polarized antennas, the polarization direction of the antenna is quantitatively adjusted. When the reader is working, it automatically and continuously changes the polarization direction. Combined with the tag identification operation performed after each polarization direction adjustment, it acquires and records the tag return signal RSSI at different polarization angles. By comparing the RSSI values, it determines the polarization direction corresponding to the strongest signal, thereby achieving optimal polarization matching with the target tag antenna, improving the recognition rate and communication stability, and ultimately achieving omnidirectional reliable identification of tags over a large area.

[0115] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0116] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A label reading method characterized by, The method comprises: Based on the initial setting of the reader, the initial polarization direction angle of the dual-polarized antenna transmitting radio frequency signals in the reader is obtained; Based on the initial polarization direction angle, the polarization direction angle of the dual-polarized antenna transmitting radio frequency signals is adjusted by respectively adjusting the power and phase relationship of the radio frequency signals transmitted by the two linear polarization antennas in the dual-polarized antenna; In the case that the change amount of the polarization direction angle reaches the preset change angle each time, at least one label recognition is performed, and the read label information is recorded.

2. The method of claim 1, wherein, The method further comprises: In the case that the change amount of the polarization direction angle reaches the preset change angle each time, a read-write instruction is sent to the target label; The received signal strength indication value and the current polarization direction angle in the return signal of the target label each time are received; By comparing the received signal strength indication values corresponding to a plurality of polarization direction angles respectively, a target polarization direction angle corresponding to the target label is selected from the plurality of polarization direction angles and recorded in the database.

3. The method of claim 2, wherein, The method comprises: Based on the initial setting of the reader, the initial polarization direction angle of the dual-polarized antenna transmitting radio frequency signals in the reader is obtained; 4. The method of claim 2, wherein, Based on the initial polarization direction angle, the polarization direction angle of the dual-polarized antenna transmitting radio frequency signals is adjusted by respectively adjusting the power and phase relationship of the radio frequency signals transmitted by the two linear polarization antennas in the dual-polarized antenna; In the case that the change amount of the polarization direction angle reaches the preset change angle each time, at least one label recognition is performed, and the read label information is recorded.

5. The method of claim 1, wherein, The method further comprises: In the case that the change amount of the polarization direction angle reaches the preset change angle each time, a read-write instruction is sent to the target label; The received signal strength indication value and the current polarization direction angle in the return signal of the target label each time are received; 6. The method of claim 1, wherein, By comparing the received signal strength indication values corresponding to a plurality of polarization direction angles respectively, a target polarization direction angle corresponding to the target label is selected from the plurality of polarization direction angles and recorded in the database. The method comprises: Based on the initial setting of the reader, the initial polarization direction angle of the dual-polarized antenna transmitting radio frequency signals in the reader is obtained; Based on the initial polarization direction angle, the polarization direction angle of the dual-polarized antenna transmitting radio frequency signals is adjusted by respectively adjusting the power and phase relationship of the radio frequency signals transmitted by the two linear polarization antennas in the dual-polarized antenna; 7. A label reading system characterized by comprising: In the case that the change amount of the polarization direction angle reaches the preset change angle each time, at least one label recognition is performed, and the read label information is recorded. The method further comprises: In the case that the change amount of the polarization direction angle reaches the preset change angle each time, a read-write instruction is sent to the target label; The received signal strength indication value and the current polarization direction angle in the return signal of the target label each time are received; By comparing the received signal strength indication values corresponding to a plurality of polarization direction angles respectively, a target polarization direction angle corresponding to the target label is selected from the plurality of polarization direction angles and recorded in the database. The method comprises: Based on the initial setting of the reader, the initial polarization direction angle of the dual-polarized antenna transmitting radio frequency signals in the reader is obtained; Based on the initial polarization direction angle, the polarization direction angle of the dual-polarized antenna transmitting radio frequency signals is adjusted by respectively adjusting the power and phase relationship of the radio frequency signals transmitted by the two linear polarization antennas in the dual-polarized antenna; In the case that the change amount of the polarization direction angle reaches the preset change angle each time, at least one label recognition is performed, and the read label information is recorded. The method further comprises: In the case that the change amount of the polarization direction angle reaches the preset change angle each time, a read-write instruction is sent to the target label; The received signal strength indication value and the current polarization direction angle in the return signal of the target label each time are received; By comparing the received signal strength indication values corresponding to a plurality of polarization direction angles respectively, a target polarization direction angle corresponding to the target label is selected from the plurality of polarization direction angles and recorded in the database. The controller is configured to obtain an initial polarization direction angle of radio frequency signals transmitted by a dual-polarized antenna in the reader-writer based on initial settings of the reader-writer, adjust the polarization direction angle of the radio frequency signals transmitted by the dual-polarized antenna by respectively adjusting power and phase relationship of radio frequency signals transmitted by two linear polarization antennas in the dual-polarized antenna based on the initial polarization direction angle, and perform at least one tag identification and record read tag information when a change amount of the polarization direction angle reaches a preset change angle each time.

8. The system of claim 7, wherein, The controller comprises a power control module. The power control module is configured to respectively set a first transmission power corresponding to a first linear polarization antenna and a second transmission power corresponding to a second linear polarization antenna in the dual-polarized antenna based on the total transmission power and the preset change angle.

9. The system of claim 7, wherein, The controller comprises a same / anti-phase control module. The same / anti-phase control module is configured to perform same-phase or anti-phase processing on the transmission radio frequency signals of the first linear polarization antenna and the second linear polarization antenna according to a value range of the polarization direction angle.

10. A label reading apparatus characterized by comprising: The method comprises: obtaining an initial polarization direction angle of radio frequency signals transmitted by a dual-polarized antenna in the reader-writer based on initial settings of the reader-writer; adjusting the polarization direction angle of the radio frequency signals transmitted by the dual-polarized antenna by respectively adjusting power and phase relationship of radio frequency signals transmitted by two linear polarization antennas in the dual-polarized antenna based on the initial polarization direction angle; performing at least one tag identification and recording read tag information when a change amount of the polarization direction angle reaches a preset change angle each time.

11. A computer readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the method in any one of claims 1 to 6.

12. An electronic device comprising a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, characterized in that, The processor executes the computer program to implement the method in any one of claims 1 to 6.

13. A computer program product having stored thereon a computer program, the computer program comprising: computer readable program means for causing a computer to perform the steps of the method according to any one of claims 1 to 12. The computer program product is executed by the processor to implement the method in any one of claims 1 to 6.

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