CN-122028128-A - RFID temperature measurement frequency point self-adaption method and system integrating environment learning

CN122028128ACN 122028128 ACN122028128 ACN 122028128ACN-122028128-A

Abstract

The invention relates to the technical field of wireless radio frequency identification, and particularly discloses an RFID temperature measurement frequency point self-adaption method and system integrating environment learning. According to the method, firstly, environmental physical and state parameters of a target area are obtained through a sensor and an ultra-wideband radar, a data foundation is laid for frequency point selection, then a read-write device transmits a read instruction in a standardized mode according to a preset frequency band and a step length frequency point scanning sequence, then the received signal intensity, the error rate and the read success rate of each frequency point are collected to form communication initial quality parameters, obstacle influence indexes of metal obstacles on each frequency point are equivalent by combining ultra-wideband radar data and a back projection algorithm, environmental influence characteristic values of each frequency point are calculated according to environmental temperature and humidity, the comprehensive score of each frequency point is obtained through normalization and weighting calculation, an optimal frequency point is selected, finally, the frequency point is switched to the frequency point to establish a communication link, the link quality is dynamically monitored, the reselection is reset when the environment changes, the frequency point self-adaption is realized, and the problem of unstable communication of the fixed frequency point is solved.

Inventors

WANG BAOYI
YANG GUANG
DING ZEYU
LU YONG

Assignees

杭州众电智能技术有限公司

Dates

Publication Date: 20260512
Application Date: 20260413

Claims (10)

1. An RFID temperature measurement frequency point self-adaption method integrating environment learning is characterized by comprising the following steps of: Acquiring environment data of the RFID temperature measurement tag at the current moment of a target monitoring area, wherein the environment data comprises environment state parameters and environment physical parameters; generating a frequency point scanning sequence according to a preset initial frequency range and a scanning step length, and controlling a reader-writer to sequentially transmit a reading instruction on each frequency point in the frequency point scanning sequence, wherein the reader-writer is used for connecting an RFID temperature measuring label with a background system in an RFID system; collecting communication initial quality parameters returned by the RFID temperature measurement tag on each frequency point in response to the reading instruction, wherein the communication initial quality parameters comprise a received signal strength indication value, an error rate and a reading success rate; Acquiring a distribution position area of a metal barrier in a target monitoring area according to the environmental state parameter, and acquiring a plurality of barrier influence indexes according to the distribution position area and the frequency point scanning sequence; Acquiring a plurality of environmental impact characteristic values according to the environmental physical parameters and the frequency point scanning sequence; acquiring a comprehensive score of each frequency point according to the communication initial quality parameter, the obstacle impact indexes and the environment impact characteristic values, and judging the frequency point with the highest comprehensive score as the current optimal working frequency point; and controlling the reader-writer to switch to the current optimal working frequency point, and establishing a communication link with the RFID temperature measurement tag based on the current optimal working frequency point so as to adaptively read the temperature data acquired by the RFID temperature measurement tag.
2. The method according to claim 1, wherein the step of collecting communication initial quality parameters returned by the RFID temperature measurement tag at each frequency point in response to the reading instruction comprises: For each frequency point in the frequency point scanning sequence, controlling a reader to continuously transmit K reading instructions for the frequency point, wherein K is a preset integer greater than 1, and recording whether a response signal returned by the RFID temperature measurement tag is successfully received after each transmission; acquiring successful response times and total transmission times of successfully receiving the response signals on the frequency points, and acquiring a reading success rate according to the successful response times and the total transmission times; Extracting a received signal strength indication value carried by a physical layer of the response signal successfully received each time to obtain a plurality of RSSI values, and calculating an average received signal strength indication value according to the plurality of RSSI values; Performing cyclic redundancy check on response signals successfully received each time, obtaining the number of data packets failing to check, and performing ratio of the number of the data packets to the number of successful response times to obtain an error rate; and acquiring a communication initial quality parameter according to the reading success rate, the average received signal strength indication value and the error rate.
3. The method for adaptively measuring temperature and frequency points by using the RFID integrated with environment learning according to claim 1, wherein the step of acquiring a distribution position area of a metal obstacle in a target monitoring area according to the environmental state parameter and acquiring a plurality of obstacle impact indexes according to the distribution position area and the frequency point scanning sequence comprises the steps of: Acquiring the environmental state parameters, wherein the environmental state parameters comprise echo signal data sets obtained by a reader-writer through ultra-wideband radar detection, and the echo signal data sets comprise flight time and echo intensity of a plurality of sampling points; constructing a three-dimensional space reflection intensity distribution diagram of a target monitoring area by adopting a back projection algorithm according to the flight time and the echo intensity; Threshold segmentation and connected domain analysis are carried out on the three-dimensional space reflection intensity distribution diagram, outline information of at least one metal barrier is extracted, each metal barrier corresponds to one connected domain, and the connected domain is used as a distribution position area; For each frequency point in the frequency point scanning sequence, calculating a direct path of electromagnetic waves from a reader-writer antenna to an RFID temperature measurement tag under the frequency point, and sequentially judging whether the direct path intersects with a plurality of distribution position areas; If the direct path intersects with the distribution position area, judging that the direct path is blocked by the metal barrier, acquiring a plurality of reflection coefficients and a plurality of blocking area ratios of the metal barrier, and calculating a plurality of blocking loss factors according to the reflection coefficients and the blocking area ratios; If the direct paths do not intersect with the distribution position area, judging that the direct paths are not blocked by the metal barrier, acquiring multipath reflection interference of the plurality of metal barriers on the direct paths, and calculating a plurality of interference factors according to the multipath reflection interference; and acquiring a plurality of obstacle impact indexes of the frequency points according to the shielding loss factors and the interference factors.
4. The method for adaptively measuring temperature and frequency points by using the RFID integrated with environment learning according to claim 1, wherein the step of acquiring a plurality of environmental impact characteristic values according to the environmental physical parameter and the frequency point scanning sequence comprises the steps of: Acquiring the ambient temperature and the humidity, and acquiring the relative dielectric constant and the electrical conductivity of the current air according to the ambient temperature and the humidity; Acquiring the distance between the reader-writer and the RFID temperature measurement tag, and acquiring a propagation attenuation factor of electromagnetic waves in air according to the distance, the relative dielectric constant and the conductivity; acquiring input impedance of the RFID temperature measurement tag caused by thermal expansion according to the environmental temperature, and calculating an impedance mismatch factor based on the difference between the input impedance and the characteristic impedance of a preset reader-writer; and acquiring an environmental impact characteristic value corresponding to each frequency point according to the propagation attenuation factor, the impedance mismatch factor and the frequency point scanning sequence.
5. The method for adapting an RFID temperature measurement frequency point to an environment according to claim 1, wherein the step of obtaining a composite score for each frequency point based on the communication initial quality parameter, the plurality of obstacle impact indexes, and the plurality of environment impact feature values comprises: Normalizing the communication initial quality parameters to obtain a communication initial quality normalized value; sequentially carrying out normalization processing on the obstacle influence indexes to obtain a plurality of obstacle influence normalization values; Sequentially carrying out normalization processing on the environmental impact characteristic values to obtain a plurality of environmental impact characteristic normalized values; And calculating the comprehensive score of each frequency point according to the communication initial quality normalized value, the plurality of obstacle influence normalized values and the plurality of environment influence characteristic normalized values.
6. The method for adaptively reading temperature data collected by the RFID temperature measurement tag according to claim 1, wherein the step of establishing a communication link with the RFID temperature measurement tag based on the current optimal operating frequency point to adaptively read the temperature data collected by the RFID temperature measurement tag comprises: When the current optimal working frequency point continuously reads temperature data, periodically acquiring a real-time received signal strength indication value and a real-time error rate; acquiring a historical average received signal strength indication value of a current optimal working frequency point, and calculating a link quality score according to the real-time received signal strength indication value, the real-time error rate and the historical average received signal strength indication value; judging whether the link quality score is lower than a preset threshold value and the duration exceeds a set window; if the link quality score is lower than a preset threshold value and the duration exceeds a set window, immediately interrupting communication and triggering full-flow reset, and returning to the step of acquiring environment data of the RFID temperature measurement tag at the current moment of the target monitoring area to re-sense the environment and scanning frequency points; If the link quality score is not lower than the preset threshold and the duration exceeds the set window, maintaining the current working frequency point, and storing the read temperature data, environment characteristic data, working frequency point and link quality score in a database in an associated mode, wherein the mapping relation between the environment characteristic and the optimal frequency point is used for updating, so that the temperature data acquired by the RFID temperature measurement tag can be read in a self-adaptive mode.
7. An RFID temperature measurement frequency point self-adaptive system integrating environment learning, which is characterized by comprising: The system comprises a data acquisition module, a target monitoring area and a target monitoring area, wherein the data acquisition module is used for acquiring environment data of the RFID temperature measurement tag at the current moment of the target monitoring area, and the environment data comprises environment state parameters and environment physical parameters; The scanning module is used for generating a frequency point scanning sequence according to a preset initial frequency range and a scanning step length, and controlling the reader to sequentially emit a reading instruction on each frequency point in the frequency point scanning sequence, wherein the reader is used for connecting an RFID temperature measuring label with a background system in an RFID system; The communication quality acquisition module is used for acquiring communication initial quality parameters returned by the RFID temperature measurement tag on each frequency point in response to the reading instruction, wherein the communication initial quality parameters comprise a received signal strength indication value, an error rate and a reading success rate; The obstacle acquisition module is used for acquiring a distribution position area of the metal obstacle in the target monitoring area according to the environmental state parameter, and acquiring a plurality of obstacle impact indexes according to the distribution position area and the frequency point scanning sequence; The environment parameter module is used for acquiring a plurality of environment influence characteristic values according to the environment physical parameters and the frequency point scanning sequence; The calculation module is used for obtaining the comprehensive score of each frequency point according to the communication initial quality parameter, the obstacle impact indexes and the environment impact characteristic values, and judging the frequency point with the highest comprehensive score as the current optimal working frequency point; The temperature data acquisition module is used for controlling the reader to be switched to the current optimal working frequency point, and establishing a communication link with the RFID temperature measurement tag based on the current optimal working frequency point so as to adaptively read the temperature data acquired by the RFID temperature measurement tag.
8. The RFID temperature measurement frequency point self-adaptive system integrated with environment learning according to claim 7, the scanning module is characterized by comprising: The signal receiving unit is used for controlling the reader to continuously transmit K reading instructions for each frequency point in the frequency point scanning sequence, wherein K is a preset integer greater than 1, and recording whether a response signal returned by the RFID temperature measurement tag is successfully received after each transmission; The acquisition unit is used for acquiring the successful response times and the total transmission times of the response signals successfully received on the frequency point, and acquiring the reading success rate according to the successful response times and the total transmission times; The signal strength acquisition unit is used for extracting a received signal strength indication value carried by a physical layer of each response signal which is successfully received, obtaining a plurality of RSSI values, and calculating an average received signal strength indication value according to the plurality of RSSI values; The bit error rate acquisition unit is used for carrying out cyclic redundancy check on the response signals successfully received each time, acquiring the number of data packets failing to check, and carrying out a ratio on the number of the data packets and the number of successful response times to obtain the bit error rate; and the quality parameter acquisition unit is used for acquiring the communication initial quality parameter according to the reading success rate, the average received signal strength indication value and the error rate.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 6 when the computer program is executed.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method according to any one of claims 1 to 6.

Description

RFID temperature measurement frequency point self-adaption method and system integrating environment learning Technical Field The invention relates to the technical field of wireless radio frequency identification, in particular to an RFID temperature measurement frequency point self-adaption method and system integrating environment learning. Background Under the background of rapid development of the internet of things technology, the Radio Frequency Identification (RFID) technology is widely applied to the fields of logistics, warehousing, industrial monitoring and the like due to the advantages of non-contact, rapid identification and the like. The RFID temperature measurement tag formed by combining the RFID technology with the temperature sensing can realize the identification of a target object and the real-time monitoring of the temperature state, and has important application value in the scenes such as power equipment inspection, cold chain logistics and the like; However, in a practical application environment, the performance of an RFID temperature measurement system is significantly affected by complex environmental factors. First, the resonance frequency of the RFID tag shifts with changes in the ambient temperature, humidity, and dielectric characteristics of the material of the attached object. Secondly, the relative position between the reader antenna and the tag and the reflection interference of surrounding metal objects can cause multipath fading of signals, so that the problem that the stable energy transmission is difficult to ensure in the existing working mode of fixed frequency points is caused. Disclosure of Invention The invention aims to provide an RFID temperature measurement frequency point self-adaption method integrating environment learning, which comprises the following steps: Acquiring environment data of the RFID temperature measurement tag at the current moment of a target monitoring area, wherein the environment data comprises environment state parameters and environment physical parameters; generating a frequency point scanning sequence according to a preset initial frequency range and a scanning step length, and controlling a reader-writer to sequentially transmit a reading instruction on each frequency point in the frequency point scanning sequence, wherein the reader-writer is used for connecting an RFID temperature measuring label with a background system in an RFID system; collecting communication initial quality parameters returned by the RFID temperature measurement tag on each frequency point in response to the reading instruction, wherein the communication initial quality parameters comprise a received signal strength indication value, an error rate and a reading success rate; Acquiring a distribution position area of a metal barrier in a target monitoring area according to the environmental state parameter, and acquiring a plurality of barrier influence indexes according to the distribution position area and the frequency point scanning sequence; Acquiring a plurality of environmental impact characteristic values according to the environmental physical parameters and the frequency point scanning sequence; acquiring a comprehensive score of each frequency point according to the communication initial quality parameter, the obstacle impact indexes and the environment impact characteristic values, and judging the frequency point with the highest comprehensive score as the current optimal working frequency point; and controlling the reader-writer to switch to the current optimal working frequency point, and establishing a communication link with the RFID temperature measurement tag based on the current optimal working frequency point so as to adaptively read the temperature data acquired by the RFID temperature measurement tag. Preferably, the step of collecting the communication initial quality parameter returned by the RFID temperature measurement tag at each frequency point in response to the reading instruction includes: For each frequency point in the frequency point scanning sequence, controlling a reader to continuously transmit K reading instructions for the frequency point, wherein K is a preset integer greater than 1, and recording whether a response signal returned by the RFID temperature measurement tag is successfully received after each transmission; acquiring successful response times and total transmission times of successfully receiving the response signals on the frequency points, and acquiring a reading success rate according to the successful response times and the total transmission times; Extracting a received signal strength indication value carried by a physical layer of the response signal successfully received each time to obtain a plurality of RSSI values, and calculating an average received signal strength indication value according to the plurality of RSSI values; Performing cyclic redundancy check on response signals successfully rece