Multi-RFID tag sensing method and system, terminal and storage medium

Abstract

The invention provides a multi-RFID tag sensing method and system, a terminal and a storage medium. The method comprises the following steps: acquiring antenna impedance of an RFID antenna under multiple groups of preset environment parameters and chip impedance of an RFID chip under multiple groups of preset input power; processing corresponding chip impedance and antenna impedance by using a self-tuning circuit in the RFID chip to obtain corresponding self-tuning values, and establishing a mapping relation between an average value of the self-tuning values and a near-field environment; constructing a target function based on the self-tuning value and the near-field environment, adjusting initial design parameters of the RFID antenna to maximize the target function, and obtaining optimized antenna design parameters; and designing a target antenna by using the optimized antenna design parameters, and receiving a signal of the RFID tag by using the target antenna. According to the method, the antenna parameters are optimized, the transmitting power is no longer adjusted one by one, and the efficiency of acquiring the near-field environment information when a plurality of RFID tags are processed is effectively improved.

Description

Technical Field

[0001] The present invention relates to the field of antenna technology, and in particular to a multi-RFID tag sensing method, system, terminal and storage medium. Background Art

[0002] In RFID (Radio Frequency Identification) systems, reflected signal strength (RSSI) is used to measure the strength of scattered signals. Analog characteristics such as reflected signal strength are not only affected by antenna impedance and link loss, but also by the impedance of the tag chip.

[0003] The existing technology usually establishes the corresponding relationship between a single sensor variable and a scattered signal based on the assumption that the chip impedance is constant under low input power. However, the chip impedance of the RFID tag is not fixed, but will fluctuate significantly with slight changes in its relative position (including angle and distance) with the reader. This change requires the reader to adjust its transmission power one by one according to the specific conditions of each tag when performing the task of acquiring the near-field environment of the RFID tag, in order to achieve better signal reception. This one-by-one adjustment process reduces the overall work efficiency in a complex environment where multiple RFID tags coexist.

[0004] Therefore, the prior art has defects and needs to be improved and developed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a multi-RFID tag sensing method, system, terminal and storage medium in view of the above-mentioned defects of the prior art, aiming to solve the problem of low efficiency in processing multiple RFID tags in the prior art.

[0006] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0007] In a first aspect, an embodiment of the present invention provides a multi-RFID tag sensing method, the method comprising:

[0008] Obtaining the antenna impedance of the RFID antenna in the RFID tag under multiple sets of preset environmental parameters, and the chip impedance of the RFID chip in the RFID tag under multiple sets of preset input powers;

[0009] For each set of environmental parameters and input power combination, the corresponding chip impedance and antenna impedance are processed using the self-tuning circuit in the RFID chip to obtain the corresponding self-tuning value, and a mapping relationship between the average value of the self-tuning value and the near-field environment is established;

[0010] Constructing an objective function based on the self-tuning value and the near-field environment, adjusting initial design parameters of the RFID antenna to maximize the objective function, and obtaining optimized antenna design parameters;

[0011] The target antenna is designed using the optimized antenna design parameters, and the target antenna is used to receive the signal of the RFID tag.

[0012] In one embodiment, the environmental parameters include the speed of light, the transmission power of the RFID reader, the signal frequency, the RFID reader antenna gain, the RFID chip antenna gain, the polarization matching coefficient, and the relative distance between the RFID reader and the RFID tag. The signal frequency is the frequency of signal communication between the RFID reader and the RFID tag, and the polarization matching coefficient is the degree of polarization matching between the internal antenna of the RFID reader and the RFID antenna.

[0013] In one embodiment, for each set of environmental parameters and input power combination, using the self-tuning circuit in the RFID chip to process the corresponding chip impedance and antenna impedance to obtain the corresponding self-tuning value includes:

[0014] For each set of environmental parameters and input power combinations, a self-tuning circuit in the RFID chip is used to adjust chip parameters based on the chip impedance to obtain a target chip impedance, wherein the target chip impedance and the antenna impedance have a target matching relationship;

[0015] A serial number representing the impedance state of the target chip is generated, and the serial number is used as a self-tuning value.

[0016] In one implementation, the self-tuning value is in hexadecimal format.

[0017] In one embodiment, constructing an objective function based on the self-tuning value and the near-field environment includes:

[0018] Constructing a tag sensing efficiency function based on the self-tuning value;

[0019] constructing a power transmission efficiency function based on the near-field environment;

[0020] The sensing efficiency function is added to the transmission efficiency function to obtain a target function.

[0021] In one embodiment, adjusting the initial design parameters of the RFID antenna to maximize the objective function to obtain optimized antenna design parameters includes:

[0022] Automatically adjust the initial design parameters of the antenna using an optimization algorithm;

[0023] Monitoring the change of the objective function value until determining the antenna design parameter that maximizes the objective function value. In one embodiment, the method further includes:

[0024] Determining a target self-tuning value corresponding to the antenna design parameter;

[0025] The target self-tuning value is substituted into the mapping relationship between the average value of the self-tuning value and the near-field environment to determine the actual near-field environment of the antenna.

[0026] In a second aspect, an embodiment of the present invention further provides a multi-RFID tag sensing system, comprising:

[0027] An impedance acquisition module is used to acquire the antenna impedance of the RFID antenna in the RFID tag under multiple sets of preset environmental parameters, and the chip impedance of the RFID chip in the RFID tag under multiple sets of preset input powers;

[0028] A mapping relationship generating module is used to process the corresponding chip impedance and antenna impedance using the self-tuning circuit in the RFID chip for each set of environmental parameters and input power combination, obtain the corresponding self-tuning value, and establish a mapping relationship between the average value of the self-tuning value and the near-field environment;

[0029] A parameter generation module, which constructs an objective function based on the self-tuning value and the near-field environment, adjusts the initial design parameters of the RFID antenna to maximize the objective function, and obtains optimized antenna design parameters;

[0030] The signal receiving module is used to design a target antenna using the optimized antenna design parameters and receive the signal of the RFID tag using the target antenna.

[0031] In a third aspect, an embodiment of the present invention further provides a terminal, comprising: a memory, a processor, and a multi-RFID tag sensing program stored in the memory and executable on the processor, wherein the multi-RFID tag sensing program implements the steps of the multi-RFID tag sensing method as described above when executed by the processor.

[0032] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium storing a multi-RFID tag sensing program, wherein the multi-RFID tag sensing program can be executed to implement the steps of the multi-RFID tag sensing method as described above.

[0033] Beneficial effects of the present invention: The present invention obtains the antenna impedance of the RFID antenna under multiple sets of preset environmental parameters and the chip impedance of the RFID chip under multiple sets of preset input powers; uses the self-tuning circuit in the RFID chip to process the corresponding chip impedance and antenna impedance to obtain the corresponding self-tuning value, and establishes a mapping relationship between the average value of the self-tuning value and the near-field environment; constructs an objective function based on the self-tuning value and the near-field environment, adjusts the initial design parameters of the RFID antenna to maximize the objective function, and obtains the optimized antenna design parameters; uses the optimized antenna design parameters to design the target antenna, and uses the target antenna to receive the signal of the RFID tag. By optimizing the antenna parameters, the present invention no longer relies on adjusting the transmission power one by one, and effectively improves the efficiency when processing multiple RFID tags. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a flow chart of a preferred embodiment of the multi-RFID tag sensing method in the present invention.

[0035] Figure 2 It is a schematic diagram of the chip impedance changing with input power in the present invention.

[0036] Figure 3 It is a schematic diagram of the structure of the RFID tag with self-tuning function in the present invention.

[0037] Figure 4 It is a schematic diagram of the corresponding relationship between the circuit parameters and the self-tuning values ​​of the RFID chip in the present invention.

[0038] Figure 5 It is a schematic diagram of the overall data processing flow in the present invention.

[0039] Figure 6 It is a schematic diagram of optimized antenna design parameters in the present invention.

[0040] Figure 7 It is a data schematic diagram of the optimized antenna design parameters in the present invention.

[0041] Figure 8 It is a schematic diagram of the relationship between input power and self-tuning value in the normal state and the warning state in the present invention.

[0042] Fig. 9 It is a schematic diagram of the relationship between input power and power transmission coefficient in the normal state and the warning state in the present invention.

[0043] Fig.10 It is a schematic diagram comparing the self-tuning values ​​at the same liquid level and at different liquid levels under different input power conditions in the present invention.

[0044] Fig.11 It is a schematic diagram of parameter settings for an application scenario in the present invention.

[0045] Fig.12 It is a functional principle block diagram of a preferred embodiment of the multi-RFID tag sensing system in the present invention.

[0046] Fig.13 It is a terminal principle block diagram of the present invention. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the present invention clearer and more specific, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0048] In RFID (Radio Frequency Identification) systems, reflected signal strength (RSSI) is used to measure the strength of scattered signals. The reflected signal strength is not only affected by antenna impedance and link loss, but also by the impedance of the tag chip.

[0049] The existing technology usually establishes the corresponding relationship between a single sensor variable and a scattered signal based on the assumption that the chip impedance is constant under low input power. However, the chip impedance of the RFID tag is not fixed, but will fluctuate significantly with slight changes in its relative position (including angle and distance) with the reader. This change requires the reader to adjust its transmission power one by one according to the specific conditions of each tag when performing the task of obtaining the near-field environmental status of the tag, in order to achieve a better effect of obtaining sensor information. This one-by-one adjustment process reduces the overall work efficiency in a complex environment where multiple RFID tags coexist.

[0050] In view of the above-mentioned defects of the prior art, the present invention provides a multi-RFID tag sensing method, system, terminal and storage medium, the method comprising: obtaining the antenna impedance of the RFID antenna under multiple sets of preset environmental parameters, and the chip impedance of the RFID chip under multiple sets of preset input powers; using the self-tuning circuit in the RFID chip to process the corresponding chip impedance and antenna impedance, obtain the corresponding self-tuning value, and establish a mapping relationship between the average value of the self-tuning value and the near-field environment; constructing an objective function based on the self-tuning value and the near-field environment, adjusting the initial design parameters of the RFID antenna to maximize the objective function, and obtaining the optimized antenna design parameters; using the optimized antenna design parameters to design the target antenna, and using the target antenna to receive the signal of the RFID tag. By optimizing the antenna parameters, the present invention no longer relies on adjusting the transmission power one by one, and effectively improves the efficiency when processing multiple RFID tags.

[0051] See also Figure 1 The multi-RFID tag sensing method described in the embodiment of the present invention comprises the following steps:

[0052] Step S100: acquiring the antenna impedance of the RFID antenna in the RFID tag under multiple sets of preset environmental parameters, and the chip impedance of the RFID chip in the RFID tag under multiple sets of preset input powers.

[0053] Specifically, an RFID tag contains an RFID antenna and an RFID chip. The antenna impedance is affected by environmental parameters, while the chip impedance is affected by input power. Figure 2 As shown, Figure 2 It is a schematic diagram of the chip impedance changing with input power. c Represents the imaginary part of the chip impedance, R c Represents the real part of the chip impedance.

[0054] The present invention obtains the antenna impedance under different preset environmental parameters and the chip impedance under different input powers, and later uses the self-tuning circuit in the RFID tag to combine the chip impedance and the antenna impedance to obtain a self-tuning value.

[0055] In one implementation, the environmental parameters include RFID reader transmission power, signal frequency, RFID reader antenna gain, RFID chip antenna gain, polarization matching coefficient, and relative distance between the RFID reader and the RFID tag. The signal frequency is the frequency of signal communication between the RFID reader and the RFID tag, and the polarization matching coefficient is the degree of polarization matching between the internal antenna of the RFID reader and the RFID antenna.

[0056] Specifically, different environmental parameters will affect the antenna impedance, and the present invention can comprehensively and accurately evaluate the impedance characteristics of the RFID antenna under different conditions by including a large number of environmental parameters, which helps to design RFID antenna design parameters with high stability and reliability.

[0057] See also Figure 1 The multi-RFID tag sensing method described in the embodiment of the present invention comprises the following steps:

[0058] Step S200: For each set of environmental parameters and input power combinations, the corresponding chip impedance and antenna impedance are processed using the self-tuning circuit in the RFID chip to obtain a corresponding self-tuning value, and a mapping relationship between an average value of the self-tuning value and the near-field environment is established.

[0059] Specifically, the RFID tag of the present invention includes a chip that supports a self-tuning function, such as an R6-P chip. The self-tuning circuit can fine-tune the impedance of the chip and thereby improve the power transmission coefficient τ between the antenna and the chip. The self-tuning function reduces the need for manual adjustment of communication parameters and reduces the maintenance cost and complexity of the system. The self-tuning circuit stores the serial number corresponding to the fine-tuned impedance as a self-tuned value (self-tuned Value) in V. Figure 3 As shown, Figure 3 Schematic diagram of the structure of an RFID tag with self-tuning function, where R p is the parallel resistance in the self-tuning RFID chip, in Ω, Cp is the parallel capacitance in the self-tuning RFID chip, in pF, C s is the series capacitance in the self-tuning RFID chip, in fF, V ant is the voltage on the antenna. After the self-tuning value is obtained, a one-to-one mapping relationship between the average value of the self-tuning value and the near-field environment is established.

[0060] In one implementation, for each set of environmental parameters and input power combinations, using a self-tuning circuit in the RFID chip to process the corresponding chip impedance and antenna impedance to obtain a corresponding self-tuning value includes:

[0061] For each set of environmental parameters and input power combinations, a self-tuning circuit in the RFID chip is used to adjust chip parameters based on the chip impedance to obtain a target chip impedance, wherein the target chip impedance and the antenna impedance have a target matching relationship;

[0062] A serial number representing the impedance state of the target chip is generated, and the serial number is used as a self-tuning value.

[0063] Specifically, the target matching relationship is that the chip impedance and the antenna impedance have the highest matching degree. Figure 4 As shown, Figure 4 The figure is a schematic diagram of the corresponding relationship between the circuit parameters and the self-tuning value of the RFID chip, where frequency range is the frequency range and V is the self-tuning value.

[0064] In one implementation, the self-tuning value is in hexadecimal format.

[0065] See also Figure 1 The multi-RFID tag sensing method described in the embodiment of the present invention comprises the following steps:

[0066] Step S300: construct an objective function based on the self-tuning value and the near-field environment, adjust the initial design parameters of the RFID antenna to maximize the objective function, and obtain optimized antenna design parameters.

[0067] Specifically, the objective function is constructed using the self-tuning value and the near-field environment, and then the initial design parameters of the antenna are iteratively optimized to maximize the objective function, and finally the optimized antenna design parameters can be obtained. By maximizing the objective function, it is possible to ensure that the better antenna design parameters are obtained, thereby ensuring the overall processing efficiency of the system. This method can effectively avoid the situation of adjusting the transmission power one by one in traditional means, and effectively improve the efficiency when processing multiple RFID tags.

[0068] In one implementation, constructing an objective function based on the self-tuning value and the near-field environment includes:

[0069] Constructing a tag sensing efficiency function based on the self-tuning value;

[0070] constructing a power transmission efficiency function based on the near-field environment;

[0071] The sensing efficiency function is added to the transmission efficiency function to obtain a target function.

[0072] Specifically, the sensor efficiency (Tag Sensor efficiency) function is expressed as TSE=SE1-SE2, SE2=max{v k}, k∈[1,K]. The power transfer efficiency function is expressed as: PTE=min(τ(Ψ k )),k∈[1,K]. Where, the input power of the chip is P in =[P in,1 ,…P in,m ,…,P in,M ], the corresponding chip impedance is Z C =[Z C,1 ,…Z C,m ,…,Z C,M ], the near-field environment of the antenna is Ψ=[Ψ1,…Ψ k ,…,Ψ K ], the corresponding antenna impedance is Z A =[Z A,1 ,…Z A,k ,…,Z A,K ],V m,k Indicates that the chip input power is P in,m , the antenna near field environment is Ψ k The auto-tuning value at .

[0073]

[0074] V k =[V1,k ,…V m,k ,…,V M,k ] is the antenna near field environment Ψ k Self-tuning value at different input power, m k and σ k V k The objective function is TSE+PTE. The present invention aims to improve the sensing efficiency and power transmission efficiency at the same time by setting a reasonable objective function, thereby improving the overall performance of the RFID tag.

[0075] In one implementation, adjusting the initial design parameters of the RFID antenna to maximize the objective function to obtain optimized antenna design parameters includes:

[0076] Automatically adjust the initial design parameters of the antenna using an optimization algorithm;

[0077] The change of the objective function value is monitored until the antenna design parameters that maximize the objective function value are determined.

[0078] Specifically, the present invention utilizes an optimization algorithm to automatically adjust initial design parameters of the antenna.

[0079] In one implementation, the optimization algorithm is a gradient descent algorithm.

[0080] In one implementation, the method further includes:

[0081] Determining a target self-tuning value corresponding to the antenna design parameter;

[0082] The target self-tuning value is substituted into the mapping relationship between the average value of the self-tuning value and the near-field environment to determine the actual near-field environment of the antenna.

[0083] Specifically, after obtaining the target self-tuning value, the target self-tuning value is substituted into the mapping relationship between the average value of the self-tuning value and the near-field environment, and the actual near-field environment of the antenna can be estimated. The actual near-field environment of the antenna can be used later to help the system adapt to changes in the actual working environment, so that the antenna can maintain high performance under different conditions. The overall data processing flow diagram of the present invention is shown in FIG. Figure 5 By optimizing the antenna parameters and then determining the antenna's near-field environment, the system's processing efficiency and performance can be effectively improved.

[0084] The method for antenna parameters of the present invention can be applied to multiple scenarios in reality. For example, Figure 6 As shown, Figure 6The figure is a schematic diagram of optimized antenna design parameters, where Ls is the length of the antenna medium, Ws is the width of the antenna medium, Hs is the thickness of the antenna medium, d, La, d0, u, g, w, v, Lb, etc. are the lengths or widths of the antenna components. Air represents air, Liquid represents liquid, Di is the width of the infusion cavity, Li is the length of the infusion cavity, Ti is the thickness of the infusion cavity, and Ψ is the near field environment. The specific values ​​of each parameter are as follows: Figure 7 As shown in the figure, simulation Parameters are simulation parameters, i.e., the optimization parameters of each antenna, and simulation Results are simulation results. The antenna designed using antenna design parameters can be applied to infusion scenarios, and the RFID tag is attached to the infusion cavity used for infusion. This RFID tag has a self-tuning function. The antenna of the RFID tag will automatically adjust the self-tuning value according to the surrounding environment (such as the liquid level of the infusion liquid) to ensure the signal transmission efficiency of the tag under different states. The RWD antenna is used to monitor the liquid level changes in real time. When the liquid level is higher than the preset height, it is considered a normal scene. When the liquid is lower than the preset height, it is considered an abnormal scene. At this time, the self-tuning parameters of the RFID tag change, and the signal strength decreases. After the system detects this change, it issues an alarm to alert medical staff.

[0085] See also Figure 8 As shown, Figure 8 The self-tuning values ​​of two states (Ψ1 in the normal state and Ψ2 in the warning state) under different input power conditions are shown. It can be seen that the self-tuning values ​​in the normal and warning states do not overlap in most input powers, and the self-tuning value of Ψ2 at [-15, -14] overlaps with Ψ1. Therefore, the current state in the infusion tube can be obtained through the self-tuning value at any position. Fig. 9 The change of the power transfer coefficient τ of the system under different received powers is shown. It can be seen that Fig. 9 The τ in is greater than 0.85, which effectively guarantees the communication distance of the tag. Fig.10 The red line in the figure is the self-tuning value at the same liquid level, and the blue line is the self-tuning value at different liquid levels. It can be seen that under different input powers, the self-tuning value V at the same liquid level is consistent, and the self-tuning values ​​V at different liquid levels are separated from each other.

[0086] In one application scenario, three RFID tags are attached to three infusion bags respectively, and an RFID reader is used to exchange signals with them. The specific parameter settings are as follows: Fig.11 As shown. Spatial factor is the spatial position factor, d represents the distance between the tag and the antenna, θ is the vertical angle between the antenna and the tag, is the rotation angle in the horizontal direction. The liquid levels of tag 1, tag 2 and tag 3: This column describes the liquid state of the three tags, each tag corresponding to a different infusion cavity. Through the multi-RFID tag sensing method of the present invention, the information transmission of multiple RFID tags can be effectively realized.

[0087] In summary, the present invention obtains the antenna impedance of the RFID antenna under multiple sets of preset environmental parameters and the chip impedance of the RFID chip under multiple sets of preset input powers; uses the self-tuning circuit in the RFID chip to process the corresponding chip impedance and antenna impedance, obtains the corresponding self-tuning value, and establishes a mapping relationship between the average value of the self-tuning value and the near-field environment; constructs an objective function based on the self-tuning value and the near-field environment, adjusts the initial design parameters of the RFID antenna to maximize the objective function, and obtains the optimized antenna design parameters; uses the optimized antenna design parameters to design the target antenna, and uses the target antenna to receive the signal of the RFID tag. By optimizing the antenna parameters, the present invention no longer relies on adjusting the transmission power one by one, and effectively improves the efficiency when processing multiple RFID tags.

[0088] In one embodiment, if Fig.12 As shown, based on the above-mentioned multi-RFID tag sensing method, the present invention also provides a multi-RFID tag sensing system, including:

[0089] The impedance acquisition module 100 is used to acquire the antenna impedance of the RFID antenna in the RFID tag under multiple sets of preset environmental parameters, and the chip impedance of the RFID chip in the RFID tag under multiple sets of preset input powers;

[0090] A mapping relationship generating module 200 is used to process the corresponding chip impedance and antenna impedance using the self-tuning circuit in the RFID chip for each set of environmental parameters and input power combination, obtain a corresponding self-tuning value, and establish a mapping relationship between the average value of the self-tuning value and the near-field environment;

[0091] A parameter generation module 300 constructs an objective function based on the self-tuning value and the near-field environment, adjusts the initial design parameters of the RFID antenna to maximize the objective function, and obtains optimized antenna design parameters;

[0092] The signal receiving module 400 is used to design a target antenna using the optimized antenna design parameters, and use the target antenna to receive the signal of the RFID tag.

[0093] In one embodiment, the system further comprises:

[0094] a target chip impedance generating unit, configured to use a self-tuning circuit to adjust chip parameters based on the chip impedance to obtain a target chip impedance, wherein the target chip impedance and the antenna impedance have a target matching relationship;

[0095] The self-tuning value generating unit is used to generate a serial number representing the impedance state of the target chip, and use the serial number as the self-tuning value.

[0096] In one embodiment, the system further comprises:

[0097] A first function construction unit, configured to construct a tag sensing efficiency function based on the self-tuning value;

[0098] A second function construction unit, configured to construct a power transmission efficiency function based on the near-field environment;

[0099] The objective function construction unit is used to add the sensing efficiency function and the transmission efficiency function to obtain an objective function.

[0100] In one embodiment, the system further comprises:

[0101] A parameter adjustment unit, used for automatically adjusting initial design parameters of the antenna using an optimization algorithm;

[0102] The parameter determination unit is used to monitor the change of the objective function value until the antenna design parameters that maximize the objective function value are determined.

[0103] In one embodiment, the system further comprises:

[0104] A target self-tuning value determining unit, used to determine a target self-tuning value corresponding to the antenna design parameter;

[0105] The actual near-field environment determining unit is used to substitute the target self-tuning value into the mapping relationship between the average value of the self-tuning value and the near-field environment to determine the actual near-field environment of the antenna.

[0106] Based on the above embodiment, the present invention further provides a terminal, whose principle block diagram can be shown as follows: Fig.13As shown. The terminal includes a processor, a memory, a network interface and a display screen connected via a system bus. The processor of the terminal is used to provide computing and control capabilities. The memory of the terminal includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a multi-RFID tag sensing program. The internal memory provides an environment for the operation of the operating system and the multi-RFID tag sensing program in the non-volatile storage medium. The network interface of the terminal is used to communicate with an external terminal via a network connection. When the multi-RFID tag sensing program is executed by the processor, the steps of any of the multi-RFID tag sensing methods described above are implemented. The display screen of the terminal can be a liquid crystal display screen or an electronic ink display screen.

[0107] Those skilled in the art will understand that Fig.13 The principle block diagram shown in the figure is only a block diagram of a partial structure related to the scheme of the present invention, and does not constitute a limitation on the terminal to which the scheme of the present invention is applied. The specific terminal may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0108] In one embodiment, a terminal is provided, comprising a memory, a processor, and a multi-RFID tag sensing program stored in the memory and executable on the processor. When the multi-RFID tag sensing program is executed by the processor, the steps of any one of the multi-RFID tag sensing methods provided in the embodiments of the present invention are implemented.

[0109] An embodiment of the present invention further provides a computer-readable storage medium, on which a multi-RFID tag sensing program is stored. When the multi-RFID tag sensing program is executed by a processor, the steps of any multi-RFID tag sensing method provided in the embodiment of the present invention are implemented.

[0110] It should be understood that the serial numbers of the steps in the above embodiments do not imply a sequence of execution, and the execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0111] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the above-mentioned system can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0112] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0113] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0114] In the embodiments provided by the present invention, it should be understood that the disclosed system / terminal device and method can be implemented in other ways. For example, the system / terminal device embodiments described above are only illustrative, for example, the division of the above modules or units is only a logical function division, and in actual implementation, other division methods can be used, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0115] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features therein may be replaced by equivalents. However, these modifications or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A multi-RFID tag sensing method, characterized in that: The method comprises: Obtaining the antenna impedance of the RFID antenna in the RFID tag under multiple sets of preset environmental parameters, and the chip impedance of the RFID chip in the RFID tag under multiple sets of preset input powers; For each set of environmental parameters and input power combination, the corresponding chip impedance and antenna impedance are processed using the self-tuning circuit in the RFID chip to obtain the corresponding self-tuning value, and a mapping relationship between the average value of the self-tuning value and the near-field environment is established; Constructing an objective function based on the self-tuning value and the near-field environment, adjusting initial design parameters of the RFID antenna to maximize the objective function, and obtaining optimized antenna design parameters; The target antenna is designed using the optimized antenna design parameters, and the target antenna is used to receive the signal of the RFID tag.

2. The multi-RFID tag sensing method according to claim 1, characterized in that: The environmental parameters include RFID reader transmission power, signal frequency, RFID reader antenna gain, RFID chip antenna gain, polarization matching coefficient, and relative distance between the RFID reader and the RFID tag. The signal frequency is the frequency of signal communication between the RFID reader and the RFID tag, and the polarization matching coefficient is the degree of polarization matching between the internal antenna of the RFID reader and the RFID antenna.

3. The multi-RFID tag sensing method according to claim 1, characterized in that: For each set of environmental parameters and input power combination, the corresponding chip impedance and antenna impedance are processed by the self-tuning circuit in the RFID chip to obtain the corresponding self-tuning value, including: For each set of environmental parameters and input power combinations, a self-tuning circuit in the RFID chip is used to adjust chip parameters based on the chip impedance to obtain a target chip impedance, wherein the target chip impedance and the antenna impedance have a target matching relationship; A serial number representing the impedance state of the target chip is generated, and the serial number is used as a self-tuning value.

4. The multi-RFID tag sensing method according to claim 3, characterized in that: The self-tuning value is in hexadecimal format.

5. The multi-RFID tag sensing method according to claim 1, characterized in that: The constructing of an objective function based on the self-tuning value and the near-field environment comprises: Constructing a tag sensing efficiency function based on the self-tuning value; constructing a power transmission efficiency function based on the near-field environment; The sensing efficiency function is added to the transmission efficiency function to obtain a target function.

6. The multi-RFID tag sensing method according to claim 1, characterized in that: The adjusting the initial design parameters of the RFID antenna to maximize the objective function and obtain the optimized antenna design parameters includes: Automatically adjust the initial design parameters of the antenna using an optimization algorithm; The change of the objective function value is monitored until the antenna design parameters that maximize the objective function value are determined.

7. The multi-RFID tag sensing method according to claim 1, characterized in that: The method further comprises: Determining a target self-tuning value corresponding to the antenna design parameter; The target self-tuning value is substituted into the mapping relationship between the average value of the self-tuning value and the near-field environment to determine the actual near-field environment of the antenna.

8. A multi-RFID tag sensing system, characterized in that: include: An impedance acquisition module is used to acquire the antenna impedance of the RFID antenna in the RFID tag under multiple sets of preset environmental parameters, and the chip impedance of the RFID chip in the RFID tag under multiple sets of preset input powers; A mapping relationship generating module is used to process the corresponding chip impedance and antenna impedance using the self-tuning circuit in the RFID chip for each set of environmental parameters and input power combination, obtain the corresponding self-tuning value, and establish a mapping relationship between the average value of the self-tuning value and the near-field environment; A parameter generation module, which constructs an objective function based on the self-tuning value and the near-field environment, adjusts the initial design parameters of the RFID antenna to maximize the objective function, and obtains optimized antenna design parameters; The signal receiving module is used to design a target antenna using the optimized antenna design parameters and receive the signal of the RFID tag using the target antenna.

9. A terminal, characterized in that: The terminal includes a memory, a processor, and a multi-RFID tag sensing program stored in the memory and executable on the processor. When the multi-RFID tag sensing program is executed by the processor, the steps of the multi-RFID tag sensing method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a multi-RFID tag sensing program, and when the multi-RFID tag sensing program is executed by the processor, the steps of the multi-RFID tag sensing method according to any one of claims 1 to 7 are implemented.

Images