CN111368569A - Frequency division dual-channel RFID multi-tag identification method and system - Google Patents
Frequency division dual-channel RFID multi-tag identification method and system Download PDFInfo
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- CN111368569A CN111368569A CN202010147140.7A CN202010147140A CN111368569A CN 111368569 A CN111368569 A CN 111368569A CN 202010147140 A CN202010147140 A CN 202010147140A CN 111368569 A CN111368569 A CN 111368569A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10297—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves arrangements for handling protocols designed for non-contact record carriers such as RFIDs NFCs, e.g. ISO/IEC 14443 and 18092
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
- G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device
- G06K17/0025—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device the arrangement consisting of a wireless interrogation device in combination with a device for optically marking the record carrier
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a frequency division dual-channel RFID multi-tag identification method and a system, wherein the identification method comprises the following steps: the reader-writer sends a trigger pulse signal and a continuous carrier signal to at least one label; the label receives a trigger pulse signal and enters a disc counting period; the tag sequentially sends ID information to the reader-writer through the sending channel in the checking period; the reader-writer sends a trigger pulse signal through a trigger channel and sends a continuous carrier signal through a sending channel. The invention can effectively solve the problem of multi-label access in the RFID technology, can realize the quick and high-sensitivity identification of the multi-label and has lower cost.
Description
Technical Field
The invention relates to the technical field of radio frequency identification, in particular to a frequency division dual-channel RFID multi-tag identification method and system.
Background
The RFID (Radio Frequency Identification) technology is also called as an electronic tag technology, and is a non-contact automatic Identification technology, and the basic working principle of the technology is to realize automatic Identification of an identified object by using Radio Frequency signals and inductance or electromagnetic space coupling transmission characteristics. RFID systems generally consist of three parts: RFID electronic tags (Tag), readers (Reader) and computer application systems.
Currently, RFID technology is used in monitoring systems (e.g., a branch monitoring system) to monitor the monitoring system for maintenance. However, after the RFID technology is applied to the monitoring system, the wireless signal of the mobile operator interferes with the access problem of multiple tags in the RFID when in use. In order to solve the above problem, a narrow-band filter is generally inserted between the tag end antenna and the chip. However, in the process of implementing the invention, the inventor finds that the following problems exist in the prior art: the filter is large in size and high in cost, and is not beneficial to large-scale application of the label; the loss caused by the mismatching of the insertion loss of the filter and the input and output ports greatly reduces the receiving sensitivity of the label.
Disclosure of Invention
The invention aims to provide a frequency division dual-channel RFID multi-tag identification method and system, which can effectively solve the problem of multi-tag access in the RFID technology, can realize quick and high-sensitivity identification of multi-tags and have lower cost.
The technical scheme is as follows:
the invention discloses a frequency division dual-channel RFID multi-tag identification method, which comprises the following steps:
the reader-writer sends a trigger pulse signal and a continuous carrier signal to at least one label;
the label receives a trigger pulse signal and enters a disc counting period;
the tag sequentially sends ID information to the reader-writer through the sending channel in the checking period;
the reader-writer sends a trigger pulse signal through a trigger channel and sends a continuous carrier signal through a sending channel.
Before the reader sends the trigger pulse signal and the continuous carrier signal to at least one label, the method further comprises the following steps:
and presetting a response time sequence number on each label, wherein the response time sequence numbers of the labels are different.
The tag sequentially sends the ID information to the reader-writer through the sending channel in the checking period, and the method specifically comprises the following steps:
judging whether the value of the counter of the label is the same as the preset response time sequence number of the label or not;
if the value of the counter of the tag is different from the preset response time sequence number of the tag, the tag does not send ID information to the reader-writer;
and if the value of the counter of the tag is the same as the preset response sequence number of the tag, the tag sends ID information to the reader-writer through a sending channel.
Judging whether the value of the counter of the label is the same as the response time sequence number of the label or not, and specifically comprising the following steps of:
the initial value of the counter of each label is a first value;
after each label receives a trigger pulse signal, the value of the counter of the label is increased/decreased by a second value;
and judging whether the value of the counter of each label after increasing/decreasing the second value is the same as the response time sequence number of the label.
Further comprising:
after the tag sends an ID signal to the reader-writer, the tag enters a silent state;
and when the label sends the ID signals, the reader stops sending the touch pulse signals and the continuous carrier signals, and the inventory cycle is ended.
The invention also discloses a frequency division dual-channel RFID multi-label identification system, which comprises a reader-writer and at least one label, wherein the reader-writer is connected with each label; and the reader-writer and the label are communicated through a first channel and a second channel.
The first channel and the second channel are in different working frequency bands.
The first channel is a trigger channel, and the second channel is a sending channel.
And each label is provided with a counter.
The following illustrates the advantages or principles of the invention:
1. the reader-writer sends the trigger pulse signal to the label through the trigger channel to start the inventory period of the label, and the label sends the ID information to the reader-writer through the sending channel. Meanwhile, the invention realizes the electrification triggering and ID information uploading of the label separately in different channels, and can realize the quick, efficient and sensitive identification of multiple labels. The invention reduces the arrangement of the filter, reduces the cost and is beneficial to the large-scale application of multiple labels.
2. The reader-writer sends the trigger pulse signal to the tag through the trigger channel, so that the tag is forced to be synchronous, the tag does not need to receive a sending instruction of the reader-writer, and the ID information can be directly sent through the sending channel after the trigger channel is triggered, so that the tag identification efficiency is improved.
Drawings
FIG. 1 is a general flow chart of a frequency division dual channel RFID multi-tag identification method according to the present embodiment;
FIG. 2 is a schematic diagram of the frequency division dual-channel RFID multi-tag identification system and the indoor monitoring system according to the present embodiment after combination;
FIG. 3 is a schematic diagram of a frequency division dual channel RFID multi-tag identification system of the present embodiment;
description of reference numerals:
10. a reader/writer; 20. and (4) a label.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
The following description will be given in detail by taking the embodiment as an example applied to a room monitoring system, and it should be noted that the embodiment is not limited to be applied to the room monitoring system, and may be applied to other environments.
As shown in fig. 1 to 3, the present embodiment discloses a frequency division dual channel RFID multi-tag identification method, which includes the following steps:
s100: the reader/writer 10 transmits a trigger pulse signal through a trigger channel and transmits a continuous carrier signal to at least one tag 20 through a transmission channel;
s200: the tag 20 receives the trigger pulse signal and enters a count period;
s300: the tag 20 sequentially transmits the ID information to the reader/writer 10 through the transmission channel in the inventory cycle.
After the reader/writer 10 of this embodiment sends the trigger pulse signal to the tag 20, on one hand, the trigger pulse signal can supply power to the tag 20, and on the other hand, the trigger pulse signal can provide a synchronous trigger signal for multiple tags.
The reader-writer 10 of this embodiment sends a trigger pulse signal to the tag 20 through the trigger channel to start the inventory cycle of the tag 20, and the tag 20 sends ID information to the reader-writer 10 through the sending channel. Meanwhile, the power-on triggering and ID information uploading of the tags 20 are realized in different channels, and the multiple tags 20 in the indoor monitoring system can be quickly, efficiently and sensitively identified. In this embodiment, the number of filters is reduced, the cost is reduced, and the large-scale application of the multi-tag 20 is facilitated.
The reader/writer 10 of this embodiment transmits a trigger pulse signal to the tag 20 through the trigger channel, so as to force the tag 20 to synchronize, and the tag 20 does not need to receive a transmission instruction of the reader/writer 10, and can directly transmit ID information through the transmission channel after the trigger channel is triggered, thereby improving the identification efficiency of the tag 20.
In this embodiment, before the reader/writer 10 sends the trigger pulse signal and the continuous carrier signal to the at least one tag 20, the method further includes:
a response time sequence number is preset on each tag 20, and the response time sequence numbers of each tag 20 are different.
The tag 20 sequentially sends the ID information to the reader/writer 10 through the sending channel in the inventory cycle, which specifically includes the following steps:
judging whether the value of the counter of the tag 20 is the same as the preset response time sequence number of the tag 20;
if the counter value of the tag 20 is the same as the response sequence number preset in the tag 20, the tag 20 does not transmit the ID information to the reader/writer 10;
if the counter value of the tag 20 is the same as the response sequence number preset in the tag 20, the tag 20 transmits ID information to the reader/writer 10 through a transmission channel.
Judging whether the counter value of the tag 20 is the same as the response time sequence number of the tag 20, specifically includes the following steps:
the initial value of the counter for each tag 20 is a first value;
after each tag 20 receives a trigger pulse signal, the value of the counter of the tag 20 is increased/decreased by a second value;
it is determined whether the value of the counter of each of the tags 20 after increasing/decreasing the second value is the same as the response timing number of the tag 20.
The multi-tag identification method of the embodiment further comprises the following steps:
after the tag 20 sends an ID signal to the reader/writer 10, the tag 20 enters a silent state;
when all the tags 20 transmit the ID signals, the reader/writer 10 stops transmitting the touch pulse signal and the continuous carrier signal, and the inventory cycle is ended.
The following is further illustrated by a specific example:
in this embodiment, the number of tags may be set to 5, where the response time sequence number of the first tag 20 is 1, the response time sequence number of the second tag 20 is 3, the response time sequence number of the third tag 20 is 5, the response time sequence number of the fourth tag 20 is 7, and the response time sequence number of the fifth tag 20 is 9.
After the tag 20 is powered on, an initial value of the counter is initialized, the initial value may be set to "0", the tag 20 enters an inventory cycle after receiving a trigger pulse signal, and the counter is incremented/decremented by a second value after each trigger pulse signal is received by the tag 20.
When all the tags 20 receive a trigger signal, the counters of all the tags 20 are incremented by 1, i.e. the value of all the counters is 1. At this time, the counter value of the first tag 20 is the same as the response sequence number of the first tag 20, the first tag 20 transmits the ID information to the reader/writer 10 through the transmission channel, and then the first tag 20 enters the silent state. Then, all the tags 20 continue to receive the trigger pulse signal, after receiving the second trigger pulse signal, the number of the counters of the remaining four tags 20 is increased to 2, and at this time, when there is no response from the tag 20, the number is the same as 2, the trigger pulse signal continues to be received, and after receiving the third trigger pulse signal, the number of the counter of the second tag 20 is the same as the response sequence number of the second tag 20, and the second tag 20 sends the ID information to the reader/writer 10.
After the third tag 20, the fourth tag 20, and the fifth tag 20 sequentially transmit the ID information according to the above steps, the inventory cycle is ended.
In this embodiment, the plurality of tags 20 sequentially send the ID information to the reader/writer 10 according to the set response sequence number, and collision does not occur between the plurality of tags 20, so that sequential identification of the plurality of tags 20 is respectively realized, and a situation of missing reading does not occur.
The embodiment also discloses a frequency division dual-channel RFID multi-tag identification system, which comprises a reader-writer 10 and at least one tag 20, wherein the tag 20 is positioned on a room antenna of a room monitoring system, each tag 20 corresponds to one room antenna, and the reader-writer 10 is connected with each tag 20 through a link of the room monitoring system; the reader/writer 10 and the tag 20 communicate with each other through a first channel and a second channel.
In this embodiment, the first channel is a trigger channel, the second channel is a transmission channel, and the trigger channel and the transmission channel are respectively located in different working frequency bands. Preferably, the operating frequency band of the trigger channel may be ism2.4ghz, and the trigger channel in the frequency band may avoid signal interference of the mobile communication system such as 4G, and does not need to obtain a frequency use permission. Preferably, the operating frequency band of the second channel is 840MHz to 960 MHz. The working frequency bands of the trigger channel and the transmission channel in this embodiment are not limited to the above frequency band ranges, and in practical use, different working frequency bands may be set according to different environments in which the RFID multi-tag identification system is applied and different distances between the reader/writer 10 and the tag 20.
In this embodiment, in order to facilitate the counting of the tags 20, a counter is further provided on each tag 20.
The embodiments of the present invention are not limited thereto, and according to the above-mentioned contents of the present invention, the present invention can be modified, substituted or combined in other various forms without departing from the basic technical idea of the present invention.
Claims (9)
1. The frequency division dual-channel RFID multi-tag identification method is characterized by comprising the following steps:
the reader-writer sends a trigger pulse signal and a continuous carrier signal to at least one label;
the label receives a trigger pulse signal and enters a disc counting period;
the tag sequentially sends ID information to the reader-writer through the sending channel in the checking period;
the reader-writer sends a trigger pulse signal through a trigger channel and sends a continuous carrier signal through a sending channel.
2. The frequency division dual channel RFID multi-tag identification method of claim 1, before the reader sends the trigger signal and the continuous carrier signal to at least one tag, further comprising:
and presetting a response time sequence number on each label, wherein the response time sequence numbers of the labels are different.
3. The frequency division dual-channel RFID multi-tag identification method according to claim 2, wherein the tag sequentially transmits ID information to the reader through the transmission channel in the inventory cycle, specifically comprising the steps of:
judging whether the value of the counter of the label is the same as the preset response time sequence number of the label or not;
if the value of the counter of the tag is different from the preset response time sequence number of the tag, the tag does not send ID information to the reader-writer;
and if the value of the counter of the tag is the same as the preset response sequence number of the tag, the tag sends ID information to the reader-writer through a sending channel.
4. The method according to claim 3, wherein the step of determining whether the counter value of the tag is the same as the response sequence number of the tag comprises the following steps:
the initial value of the counter of each label is a first value;
after each label receives a trigger pulse signal, the value of the counter of the label is increased/decreased by a second value;
and judging whether the value of the counter of each label after increasing/decreasing the second value is the same as the response time sequence number of the label.
5. The frequency division dual channel RFID multi-tag identification method of any of claims 1 to 4, further comprising:
after the tag sends an ID signal to the reader-writer, the tag enters a silent state;
and when the label sends the ID signals, the reader stops sending the touch pulse signals and the continuous carrier signals, and the inventory cycle is ended.
6. The frequency division dual-channel RFID multi-tag identification system is characterized by comprising a reader-writer and at least one tag, wherein the reader-writer is connected with each tag; and the reader-writer and the label are communicated through a first channel and a second channel.
7. The frequency division dual channel RFID multi-tag identification system of claim 6, wherein the first channel is in a different operating frequency band than the second channel.
8. The frequency division dual channel RFID multi-tag identification system of claim 6, wherein the first channel is a trigger channel and the second channel is a transmit channel.
9. The frequency division dual channel RFID multi-tag identification system according to any of claims 6 to 8, wherein a counter is provided on each of the tags.
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