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CN-121997954-A - Radio frequency identification method and device

CN121997954ACN 121997954 ACN121997954 ACN 121997954ACN-121997954-A

Abstract

A radio frequency identification method and apparatus are disclosed. The method comprises the steps that an RFID reader sends first signals to the RFID tag, the RFID reader receives second signals sent by the RFID tag through at least three receiving antennas respectively, and the RFID reader determines the position of the RFID tag based on the second signals received by the at least three receiving antennas. The second signal comprises a plurality of sub-signals, each of the plurality of sub-signals is a frequency shift signal of the first signal, and center frequencies of the plurality of sub-signals are different. And the RFID tag is positioned based on the second signals received by the at least three receiving antennas, so that additional equipment such as a mobile robot is not needed, and the positioning scheme is simple and has lower cost. The second signal comprises a plurality of frequency shift signals with different center frequencies, so that on one hand, the same-frequency interference can be avoided, and on the other hand, a plurality of sub-signals can be combined into a broadband signal, so that the bandwidth of the signal for positioning is larger, and the positioning precision is improved.

Inventors

  • ZHANG XIANAN
  • LIAO RUOLIN
  • DONG XIAOLONG

Assignees

  • 华为技术有限公司

Dates

Publication Date
20260508
Application Date
20241105

Claims (17)

  1. 1. A method of radio frequency identification, the method comprising: The radio frequency identification reader sends a first signal to the radio frequency identification tag; The radio frequency identification reader receives second signals sent by the radio frequency identification tag through at least three receiving antennas respectively, wherein the second signals comprise a plurality of sub-signals, each sub-signal in the plurality of sub-signals is a frequency shift signal of the first signal, and the center frequencies of the plurality of sub-signals are different; The radio frequency identification reader determines a location of the radio frequency identification tag based on the second signals received by the at least three receive antennas.
  2. 2. The method of claim 1, wherein the radio frequency identification reader determining the location of the radio frequency identification tag based on the second signals received by the at least three receive antennas comprises: the radio frequency identification reader respectively synthesizes the plurality of sub-signals in the second signals received by the at least three receiving antennas into at least three broadband signals; the radio frequency identification reader respectively determines the distances between the at least three receiving antennas and the radio frequency identification tag based on the at least three broadband signals; the radio frequency identification reader determines a location of the radio frequency identification tag based on distances between the at least three receiving antennas and the radio frequency identification tag.
  3. 3. The method of claim 1 or 2, wherein the first signal comprises a frequency shift interval, and wherein a difference between a center frequency of each of the sub-signals and a center frequency of the first signal is an integer multiple of the frequency shift interval.
  4. 4. The method of claim 3, wherein the first signal further comprises an operating mode, the operating mode in the first signal being a first mode, the first mode being used to indicate that the signal transmitted by the radio frequency identification tag comprises a plurality of frequency shifted signals.
  5. 5. The method according to any one of claims 1 to 4, further comprising: The radio frequency identification reader sends a third signal to the radio frequency identification tag, wherein the third signal comprises a working mode, the working mode in the third signal is a second mode, and the second mode is used for indicating that the signal sent by the radio frequency identification tag comprises a frequency shift signal; The radio frequency identification reader receives a fourth signal sent by the radio frequency identification tag through at least one receiving antenna, wherein the fourth signal is a frequency shift signal of the third signal; the radio frequency identification reader obtains information of the radio frequency identification tag based on the fourth signal received by at least one receiving antenna.
  6. 6. The method according to any one of claims 1 to 5, further comprising: The radio frequency identification reader sends a fifth signal to the radio frequency identification tag, wherein the fifth signal comprises a working mode, the working mode in the fifth signal is a third mode, and the third mode is used for indicating that the signal sent by the radio frequency identification tag comprises a same-frequency signal; The radio frequency identification reader receives a sixth signal sent by the radio frequency identification tag through at least one receiving antenna, wherein the center frequency of the sixth signal is the same as that of the fifth signal; the radio frequency identification reader obtains information of the radio frequency identification tag based on the sixth signal received by at least one receiving antenna.
  7. 7. A method of radio frequency identification, the method comprising: the radio frequency identification tag receives a first signal sent by the radio frequency identification reader; the radio frequency identification tag transmits a second signal to the radio frequency identification reader based on the first signal, the second signal comprises a plurality of sub-signals, each of the plurality of sub-signals is a frequency shift signal of the first signal, the center frequencies of the plurality of sub-signals are different, and the second signal is used for positioning the radio frequency identification tag.
  8. 8. The method of claim 7, wherein the first signal comprises a frequency shift interval, and wherein a difference between a center frequency of each of the sub-signals and a center frequency of the first signal is an integer multiple of the frequency shift interval.
  9. 9. The method of claim 8, wherein the radio frequency identification tag transmitting a second signal to the radio frequency identification reader based on the first signal, comprising: The radio frequency identification tag transmits the plurality of sub-signals to the radio frequency identification reader in a time-sharing manner based on the first signal and the frequency shift interval; Or the radio frequency identification tag sends a second signal to the radio frequency identification reader based on the first signal, including: the radio frequency identification tag simultaneously transmits the plurality of sub-signals to the radio frequency identification reader based on the first signal and the frequency shift interval.
  10. 10. The method of claim 8, wherein the first signal further comprises an operating mode, wherein the operating mode in the first signal is a first mode, and wherein the first mode is used to indicate that the signal transmitted by the radio frequency identification tag comprises a plurality of frequency shifted signals.
  11. 11. The method according to any one of claims 7 to 10, further comprising: the radio frequency identification tag receives a third signal sent by the radio frequency identification reader, wherein the third signal comprises a working mode, the working mode in the third signal is a second mode, and the second mode is used for indicating that the signal sent by the radio frequency identification tag comprises a frequency shift signal; The radio frequency identification tag sends a fourth signal to the radio frequency identification reader based on the third signal, wherein the fourth signal is a frequency shift signal of the third signal, and the fourth signal is used for transmitting information of the radio frequency identification tag.
  12. 12. The method according to any one of claims 7 to 11, further comprising: The radio frequency identification tag receives a fifth signal sent by the radio frequency identification reader, wherein the fifth signal comprises a working mode, the working mode in the fifth signal is a third mode, and the third mode is used for indicating that the signal sent by the radio frequency identification tag comprises a same-frequency signal; the radio frequency identification tag sends a sixth signal to the radio frequency identification reader based on the fifth signal, the sixth signal is the same as the center frequency of the fifth signal, and the sixth signal is used for transmitting information of the radio frequency identification tag.
  13. 13. A radio frequency identification device comprising means or units for performing the method of any one of claims 1 to 6.
  14. 14. A radio frequency identification device comprising means or units for performing the method of any of claims 7 to 12.
  15. 15. A radio frequency identification system comprising a radio frequency identification device according to claim 13 and a radio frequency identification device according to claim 14.
  16. 16. A computer readable storage medium, characterized in that the storage medium has stored therein a computer program or instructions which, when executed by a computer, implement the method of any one of claims 1 to 6 or the method of any one of claims 7 to 12.
  17. 17. A computer program product, characterized in that the computer, when read and executed, causes the computer to perform the method according to any one of claims 1 to 6 or the method according to any one of claims 7 to 12.

Description

Radio frequency identification method and device Technical Field The present application relates to the field of communications, and in particular, to a radio frequency identification method and apparatus. Background Radio frequency identification (radio frequency identification, RFID) is an automatic identification technology that is implemented by RFID tags and RFID readers as carriers. The RFID tag and the RFID reader perform non-contact bidirectional data communication so as to realize data interaction and even positioning of the RFID tag. The related technology provides a radio frequency identification scheme which comprises the steps that an RFID reader is arranged on a mobile robot and moves by means of the mobile robot, a plurality of positions of the RFID reader in the moving process respectively send excitation signals to RFID tags, correspondingly, the positions of the RFID reader in the moving process respectively receive response signals of the RFID tags, and the RFID reader positions the RFID tags based on the response signals received by the positions. In the related art, the mobile RFID reader needs additional equipment such as a mobile robot, so that a positioning scheme is complex and high in cost, and meanwhile, the scheme is realized in the moving process, so that the positioning precision is not high. Disclosure of Invention The application provides a radio frequency identification method and a radio frequency identification device, which can simplify a radio frequency identification positioning scheme and increase radio frequency identification positioning precision. In a first aspect, the present application provides a radio frequency identification method. The radio frequency identification method can be executed by an RFID reader, and comprises the steps that the RFID reader sends a first signal to an RFID tag, the RFID reader respectively receives second signals sent by the RFID tag through at least three receiving antennas, and the RFID reader determines the position of the RFID tag based on the second signals received by the at least three receiving antennas. The second signal comprises a plurality of sub-signals, each of the plurality of sub-signals is a frequency shift signal of the first signal, and center frequencies of the plurality of sub-signals are different. The frequency shift signal refers to a signal obtained by shifting (increasing or decreasing the frequency) the frequency based on the first signal, and a plurality of sub-signals are shifted in frequency somewhat differently, thereby obtaining a plurality of sub-signals having different center frequencies. Wherein the first signal is an excitation signal sent by the RFID reader, and the second signal is a response signal returned by the RFID tag. In the implementation mode of the application, after the RFID reader sends the first signal, the second signal sent by the RFID tag is received through at least three antennas, and as the positions of the at least three receiving antennas are different, the RFID tag can be positioned based on the second signals received by the at least three receiving antennas. According to the scheme, a mobile RFID reader is not needed in the implementation process, so that the positioning accuracy is higher. In addition, the second signal for positioning received by the RFID reader comprises a plurality of frequency shift signals with different center frequencies, on one hand, the frequency shift signals can be used for avoiding co-channel interference, on the other hand, a plurality of sub-signals can be used for synthesizing a broadband signal, so that the bandwidth of the signal for positioning is larger, the greater the bandwidth is, the higher the positioning precision is, and the positioning precision is improved. In some possible implementations of the application, the RFID reader determining the location of the RFID tag based on the second signals received by the at least three receiving antennas includes: the RFID reader respectively synthesizes a plurality of sub-signals in the second signals received by the at least three receiving antennas into at least three broadband signals; The RFID reader respectively determines the distances between at least three receiving antennas and the RFID tag based on at least three broadband signals; the RFID reader determines the location of the RFID tag based on the distances of the at least three receiving antennas from the RFID tag. In the implementation manner, the RFID reader synthesizes the plurality of sub-signals in the second signal to obtain the broadband signal with larger bandwidth, and when the signal ranging is used, the larger the signal bandwidth is, the higher the measuring precision is, and the measured distance precision between the receiving antenna and the RFID tag is high, so that the positioning precision of the final RFID tag is higher. In some examples of the application, one receiving antenna of the RFID reader may rece