CN113283258B - Method capable of automatically searching optimal working frequency point of electronic tag and reading device - Google Patents

Method capable of automatically searching optimal working frequency point of electronic tag and reading device Download PDF

Info

Publication number
CN113283258B
CN113283258B CN202110614310.2A CN202110614310A CN113283258B CN 113283258 B CN113283258 B CN 113283258B CN 202110614310 A CN202110614310 A CN 202110614310A CN 113283258 B CN113283258 B CN 113283258B
Authority
CN
China
Prior art keywords
frequency point
electronic tag
reading device
working frequency
tag
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202110614310.2A
Other languages
Chinese (zh)
Other versions
CN113283258A (en
Inventor
张钊锋
苏雪剑
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Ilian Iot Co ltd
Original Assignee
Shanghai Ilian Iot Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Ilian Iot Co ltd filed Critical Shanghai Ilian Iot Co ltd
Priority to CN202110614310.2A priority Critical patent/CN113283258B/en
Publication of CN113283258A publication Critical patent/CN113283258A/en
Application granted granted Critical
Publication of CN113283258B publication Critical patent/CN113283258B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • G06K7/10118—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 the sensing being preceded by at least one preliminary step
    • 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
    • G06K7/10198—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 setting parameters for the interrogator, e.g. programming parameters and operating modes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • 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

Landscapes

  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Near-Field Transmission Systems (AREA)

Abstract

The invention discloses a method capable of automatically searching an optimal working frequency point of an electronic tag and a reading device, wherein the method comprises the following steps: step S1, when a reading device is electrified, changing the transmitting frequency of the reading device in a working frequency band interval of an electronic tag by a first step length, starting counting, and receiving and recording the RSSI value returned by the electronic tag each time; step S2, determining a preliminary better working frequency point of the electronic tag according to the recorded RSSI value; step S3, determining a frequency point fine step searching interval according to the preliminary better working frequency point, changing the transmitting frequency of the reading device and starting counting according to a second step length in the frequency point fine step searching interval, and receiving and recording the RSSI value returned by each electronic tag; and S4, determining the optimal working frequency point of the corresponding electronic tag according to the recorded RSSI value.

Description

Method capable of automatically searching optimal working frequency point of electronic tag and reading device
Technical Field
The invention relates to the technical field of radio frequency identification, in particular to a method capable of automatically searching an optimal working frequency point of an electronic tag and a reading device.
Background
The internet of things (Internet of things) is an important trend of the current information networking development, and is called the third wave of the world information industry after computers and the Internet, and the radio frequency identification technology RFID is one of the key technologies of the internet of things. The RFID technology is a non-contact automatic identification technology, which automatically identifies a target object and acquires related data through radio frequency signals, and has the advantages of wireless reading and writing, strong signal penetration capability, long distance, long service life, good environmental adaptability, simultaneous identification of multiple tags, easy large information storage, rewritable data and the like.
In the conventional RFID tag reading and writing, anti-collision compensation is usually performed first, then each reader occupies a frequency point to read and write the RFID tag, and the tag feeds back a signal for demodulation and identification by the reader.
To solve this problem, chinese patent application CN103902945A proposes a method for improving the identification rate of RFID tags by using frequency hopping scanning, which specifically includes the following steps: (1) The RFID tag reading device transmits a reading signal to the RFID tag through fixed frequency, and the RFID tag feeds back a signal for the RFID tag reading device to recognize; (2) When the feedback signal in the step (1) is weaker and can not be identified by the RFID tag reading device, the RFID tag reading device transmits a reading signal to the RFID tag through frequency hopping continuous scanning, the RFID tag feeds back the continuous signal for the RFID tag reading device to identify, obvious signal differences exist between the continuous signals, the RFID tag reading device captures fine signals to read tag data through continuously comparing the change values of the two received signals before and after, although the frequency hopping scanning method can improve the identification rate of the RFID tag, the reading effect is not ideal because of narrower working frequency bands for electronic tags made of ceramics and the like, and the reading device uses default frequency hopping operation.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a method and a reading device capable of automatically searching the optimal working frequency point of an electronic tag, so as to realize the purpose of automatically searching the optimal working frequency point of the electronic tag only when the reading device is electrified, thereby improving the recognition rate of the electronic tag.
In order to achieve the above and other objects, the present invention provides a method for automatically searching an optimal operating frequency point of an electronic tag, comprising the following steps:
Step S1, when a reading device is electrified, changing the transmitting frequency of the reading device in a working frequency band interval of an electronic tag by a first step length, starting counting, and receiving and recording the RSSI value returned by the electronic tag each time;
step S2, determining a preliminary better working frequency point of the electronic tag according to the recorded RSSI value;
Step S3, determining a frequency point fine step searching interval according to the preliminary better working frequency point, changing the transmitting frequency of the reading device and starting counting according to a second step length in the frequency point fine step searching interval, and receiving and recording the RSSI value returned by each electronic tag;
And S4, determining the optimal working frequency point of the corresponding electronic tag according to the recorded RSSI value.
Preferably, step S1 further comprises:
step S100, when the reading device is electrified, determining an initial transmitting frequency according to a working frequency band interval of the electronic tag to be checked, starting to start the checking to electrify the electronic tag, and receiving and recording an RSSI value returned by the electronic tag;
step S101, changing the transmitting frequency of the reading device with a first step length, continuously receiving and recording the RSSI values of the electronic tags checked and read, and obtaining the RSSI values returned by the electronic tags under a plurality of transmitting frequencies.
Preferably, in step S2, the transmitting frequency when the absolute value of the RSSI returned by the electronic tag is the smallest is determined as the preliminary preferred operating frequency point corresponding to the electronic tag.
Preferably, step S3 further comprises:
step S300, a frequency point fine step searching interval is determined by taking the preliminary better working frequency point as a center;
Step S301, for each tag, selecting a frequency point as the transmitting frequency of the reading device in the frequency point fine step searching interval, starting the starting inventory to electrify the electronic tag, and receiving and recording the RSSI value returned by the electronic tag;
Step S302, changing the transmitting frequency of the reading device with a second step length, continuously receiving and recording the RSSI value of the electronic tag checked and read.
Preferably, the first step size is larger than the second step size.
Preferably, in step S4, the transmitting frequency when the absolute value of the RSSI returned by the electronic tag in the frequency point fine step search interval is minimum is determined as the best working frequency point of the corresponding tag.
Preferably, before step S1, the method further comprises the following steps:
s0, when the reading device is powered on, setting the power of the reading device to be minimum, and then entering step S1.
Preferably, after step S4, the method further comprises the following steps:
step S5, gradually increasing the power of the reading device, returning to step S1, and automatically searching the optimal working frequency point of the tag again under the current power to obtain a plurality of optimal working frequency points under different power of the reading device.
And S6, selecting an optimal working frequency point when the power of the reading device is smaller as an optimal working frequency point of the corresponding electronic tag.
In order to achieve the above object, the present invention further provides a reading device capable of automatically searching an optimal operating frequency point of an electronic tag, including:
The coarse checking module is used for changing the transmitting frequency of the electronic tag in the working frequency range of the electronic tag with a first step length and starting checking, receiving and recording the RSSI returned by the electronic tag each time, and determining the primary better working frequency point of the electronic tag according to the recorded RSSI value when the reading device is electrified;
The fine inventory module is used for determining a frequency point fine step search interval according to the preliminary preferred working frequency point, changing the transmitting frequency of the reading device and starting inventory at a second step length in the frequency point fine step search interval, receiving and recording the RSSI value returned by each time of the electronic tag, and determining the best working frequency point corresponding to the electronic tag according to the recorded RSSI value.
Preferably, the reading device further comprises:
The power adjustment module is used for setting the power of the reading device to be minimum when the reading device is electrified, then starting the coarse counting module, gradually increasing the power of the reading device for a plurality of times after the fine counting module is finished, restarting the coarse counting module after each time of power adjustment, automatically searching the optimal working frequency point of the tag again under the current power to obtain a plurality of optimal working frequency points under different reading device powers, and selecting the optimal working frequency point with smaller reading device power as the optimal working frequency point of the corresponding electronic tag.
Compared with the prior art, the method and the reading device capable of automatically searching the optimal working frequency point of the electronic tag provided by the invention have the advantages that when the reading device is powered on, the transmitting frequency of the reading device is changed in the working frequency band interval of the electronic tag in a first step length, the inventory is started, the RSSI returned by the electronic tag each time is received and recorded, the preliminary optimal working frequency point of the electronic tag is determined according to the recorded RSSI value, then the frequency point fine step searching interval is determined according to the preliminary optimal working frequency point, the transmitting frequency of the reading device is changed in the frequency point fine step searching interval in a second step length, the inventory is started, the RSSI value returned by the electronic tag each time is received and recorded, and the optimal working frequency point corresponding to the electronic tag is determined according to the recorded RSSI value, so that the aim of automatically searching the optimal working frequency point of the electronic tag when the reading device is powered on is realized, and the identification rate of the electronic tag is improved.
Drawings
FIG. 1 is a flow chart of steps of a method for automatically searching an optimal operating frequency point of an electronic tag according to the present invention;
FIG. 2 is a system architecture diagram of a reader capable of automatically searching an optimal operating frequency point of an electronic tag according to the present invention;
FIG. 3 is a flow chart of an embodiment of the present invention.
Detailed Description
Other advantages and effects of the present invention will become readily apparent to those skilled in the art from the following disclosure, when considered in light of the accompanying drawings, by describing embodiments of the present invention with specific embodiments thereof. The invention may be practiced or carried out in other embodiments and details within the scope and range of equivalents of the various features and advantages of the invention.
Fig. 1 is a flowchart of steps of a method for automatically searching an optimal operating frequency point of an electronic tag according to the present invention. As shown in FIG. 1, the method for automatically searching the optimal working frequency point of the electronic tag comprises the following steps:
Step S1, when the reading device is powered on, the transmitting frequency of the reading device is changed in a first step length in the working frequency band interval of the electronic tag, the checking is started, and the RSSI (RECEIVED SIGNAL STRENGTH Indication ) returned by the electronic tag each time is received and recorded.
The invention is based on the principle that: when a reader, such as a reader-writer, works in a fixed way on a certain frequency point to count a tag, the tag returns different RSSI values for different frequency points, and the smaller the absolute value of the RSSI value (which is a negative value such as-95 dBm generally) is, the better the signal is, and the more suitable the current frequency point is considered.
Specifically, step S1 further includes:
Step S100, when the reading device is powered on, determining an initial transmitting frequency according to the working frequency range of the electronic tag to be checked, starting to start the checking to power on the electronic tag, and receiving and recording the RSSI value returned by the electronic tag.
In the embodiment of the invention, assuming that the working frequency band of the electronic tag to be checked is 840MHz-960MHz, the lower limit of the working frequency band can be selected as the initial transmitting fixed frequency of the reading device, for example 840MHz, or the initial transmitting fixed frequency can be selected as 960MHz, which is not a limitation of the invention.
When the initial transmitting frequency of the reading device is 840MHz, the reading device starts to start the counting process to electrify the electronic tag, starts the counting process and lasts for a certain time such as 500ms, and receives and records the RSSI (received signal strength Indication) value of the electronic tag which is counted and read.
Step S101, changing the transmitting frequency of the reading device with a first step, continuously receiving and recording the RSSI (RECEIVED SIGNAL STRENGTH Indication of received signal strength) value of the checked and read electronic tag.
In the specific embodiment of the invention, assuming that the first step length is 10MHz, the transmitting frequency of the reading device is changed to 850MHz, the reading device continues to count for a certain time, such as 500ms, the RSSI value of the electronic tag read by the counting is received and recorded, … …, and the like, and then the counting is performed once every 10MHz until the upper limit of the frequency band of the electronic tag is 960MHz, and the RSSI value returned by each time of the electronic tag is recorded.
And S2, determining a preliminary better working frequency point of the electronic tag according to the recorded RSSI value.
In general, the smaller the absolute value of the RSSI value, the better the signal, and the more suitable the current frequency point is considered, so in the specific embodiment of the present invention, the transmitting frequency when the absolute value of the returned electronic tag RSSI value is the smallest is determined as the preliminary preferred operating frequency point. For example, assuming that the absolute value of RSSI of tag 1 is minimum at 910MHz, the absolute value of RSSI of tag 2 is minimum at 860MHz, and the absolute value of RSSI of tag 3 is minimum at 940MHz, the preliminary preferred operating frequency point of tag 1 is 910MHz, the preliminary preferred operating frequency point of tag 2 is 860MHz, and the preliminary preferred operating frequency point of tag 3 is 940MHz.
And step S3, determining a frequency point fine step search interval according to the preliminary better working frequency point, changing the transmitting frequency of the reading device and starting counting in a second step length in the frequency point fine step search interval, and receiving and recording the RSSI value returned by each electronic tag.
Specifically, step S3 further includes:
And step S300, taking the primary better working frequency point as a center, and determining a frequency point fine step search interval.
In the specific embodiment of the invention, near the preliminary preferred working frequency point, for example, a range of +/-5 MHz about the preliminary preferred working frequency point is used as a frequency point fine step search interval, the preliminary preferred working frequency point of the tag 1 is assumed to be 910MHz, the preliminary preferred working frequency point of the tag 2 is assumed to be 860MHz, the preliminary preferred working frequency point of the tag 3 is 940MHz, the frequency point fine step search interval of the tag 1 is determined to be 905MHz-915 MHz MHz, the preliminary preferred working frequency point of the tag 2 is determined to be 855MHz-865 MHz, and the preliminary preferred working frequency point of the tag 3 is 935MHz-945 MHz.
Step S301, for each tag, a frequency point is selected as the transmitting frequency of the reading device in the frequency point fine step searching interval, the inventory is started to electrify the electronic tag, and the RSSI value returned by the electronic tag is received and recorded.
In the specific embodiment of the invention, taking the tag 1 as an example, the frequency point step search interval is 905MHz-915MHz, then the lower limit frequency point 905MHz of the frequency point step search interval is selected as the current transmitting frequency of the reading device, and the reading device starts the inventory to electrify the tag 1, and receives and records the RSSI value returned by the tag 1.
Step S302, changing the transmitting frequency of the reading device with a second step length, continuously receiving and recording the RSSI value of the electronic tag checked and read.
In the embodiment of the present invention, the value of the second step is smaller than the first step, for example, the second step is 1MHz, the transmitting frequency of the reading device is changed to 906MHz, the reading device continues to count for a certain period of time, for example, 500ms, the RSSI value of the electronic tag read by the counting device is received and recorded, … …, and the like, and then the reading device performs the counting every time the transmitting frequency of 1MHz is changed until the upper limit 915MHz of the fine step search interval of the frequency point, and records the RSSI value returned by the tag 1 each time.
And S4, determining the optimal working frequency point of the corresponding electronic tag according to the recorded RSSI value.
According to the principle described above, the smaller the absolute value of the RSSI value is, the better the signal is, the more suitable the current frequency point is considered, therefore, the transmitting frequency when the absolute value of the RSSI value returned by the electronic tag in the frequency point fine-step search interval is minimum is determined as the best working frequency point of the corresponding tag, the best frequency point is used by the reading device when the electronic tag is subjected to the subsequent read-write operation or the read-temperature operation, taking tag 1 as an example, the transmitting frequency of 907MHz is determined as the best working frequency point corresponding to tag 1 if the absolute value of the RSSI value returned by the reading device is minimum when the transmitting frequency of the reading device is 907MHz, and the transmitting frequency of 907MHz is used by the subsequent reading device when the tag 1 is subjected to the read-write operation or the read-temperature operation.
In the present invention, when the tag frequency point searching is performed by the steps S1 to S4, the difference of the RSSI values of the tag at a plurality of frequency points may be not obvious due to the large power of the reader, which may result in the inaccuracy of the searched frequency point, so preferably, before the step S1, the method for automatically searching the best working frequency point of the electronic tag according to the present invention further includes the following steps:
s0, when the reading device is powered on, setting the power of the reading device to be minimum, and then entering step S1.
Accordingly, after step S4, the method further includes the following steps:
step S5, gradually increasing the power of the reading device, returning to step S1, and automatically searching the optimal working frequency point of the tag again under the current power to obtain a plurality of optimal working frequency points under different power of the reading device.
And S6, selecting an optimal working frequency point when the power of the reading device is smaller as an optimal working frequency point of the corresponding electronic tag.
That is, in the present invention, the maximum power is not used to automatically search the best operating frequency point of the tag when the reader is powered on, but the best operating frequency point of the tag is automatically searched once again by gradually increasing the power of the reader after the result is searched, different results are finally obtained under different powers, the result when the power is smaller is adopted as the final best operating frequency point, for example, the best frequency point of the tag 1 is obtained at the time of 25dBm of the reader, the best frequency point of the tag 1 is obtained at the time of 91 MHz, the best frequency point of the tag 1 is obtained at the time of 30dBm, the best frequency point of the tag 1 is obtained at the time of 905MHz, and finally, the result obtained when the power is smaller is determined to be the most accurate, namely, the 911MHz is adopted as the best operating frequency point corresponding to the tag 1.
Fig. 2 is a system architecture diagram of a reading device capable of automatically searching an optimal operating frequency point of an electronic tag according to the present invention. As shown in fig. 2, the reading device capable of automatically searching the optimal working frequency point of the electronic tag according to the present invention includes:
The coarse inventory module 20 is configured to change the transmitting frequency of the electronic tag and start inventory in a working frequency band of the electronic tag with a first step when the reading device is powered on, receive and record an RSSI (RECEIVED SIGNAL STRENGTH Indication) returned by the electronic tag each time, and determine a preliminary preferred working frequency of the electronic tag according to the recorded RSSI value.
The invention is based on the principle that: when the reader works in a certain frequency point to count the tag, the tag returns RSSI values to different frequency points, and the smaller the absolute value of the RSSI value (which is a negative value such as-95 dBm generally) is, the better the signal is, and the more suitable the current frequency point is considered.
Specifically, the coarse inventory module 20 is specifically configured to:
When the reading device is electrified, the initial transmitting frequency is determined according to the working frequency band interval of the electronic tag to be checked, the starting check is started to electrify the electronic tag, and the RSSI value returned by the electronic tag is received and recorded.
In the embodiment of the present invention, assuming that the working frequency band of the electronic tag checked by the reading device is 840MHz-960MHz, the lower limit of the working frequency band can be selected as the initial transmitting fixed frequency of the reading device, for example, 840MHz, and the initial transmitting fixed frequency can be selected as 960 MHz.
When the initial transmitting frequency of the reading device is 840MHz, the reading device starts to start the counting process to electrify the electronic tag, starts the counting process and lasts for a certain time such as 500ms, and receives and records the RSSI (received signal strength Indication) value of the electronic tag which is counted and read.
Then, the transmitting frequency of the reading device is changed in a first step, and the RSSI (received signal strength Indication) value of the electronic tag checked and read is continuously received and recorded.
In the specific embodiment of the invention, assuming that the first step length is 10MHz, the transmitting frequency of the reading device is changed to 850MHz, the reading device continues to count for a certain time, such as 500ms, the RSSI value of the electronic tag read by the counting is received and recorded, … …, and the like, and then the counting is performed once every 10MHz until the upper limit of the frequency band of the electronic tag is 960MHz, and the RSSI value returned by each time of the electronic tag is recorded.
And finally, determining a preliminary better working frequency point of the electronic tag according to the recorded RSSI value.
In general, the smaller the absolute value of the RSSI value is, the better the signal is, and the more suitable the current frequency point is considered, so the transmitting frequency when the absolute value of the returned electronic tag RSSI value is minimum is determined as the primary preferred working frequency point. For example, assuming that the absolute value of RSSI of tag 1 is minimum at 910MHz, the absolute value of RSSI of tag 2 is minimum at 860MHz, and the absolute value of RSSI of tag 3 is minimum at 940MHz, the preliminary preferred operating frequency point of tag 1 is 910MHz, the preliminary preferred operating frequency point of tag 2 is 860MHz, and the preliminary preferred operating frequency point of tag 3 is 940MHz.
The fine inventory module 21 is configured to determine a frequency point fine step search interval according to the preliminary preferred operating frequency point, change the transmitting frequency of the reader and start inventory at the second step length in the frequency point fine step search interval, receive and record the RSSI value returned by each electronic tag, and determine the best operating frequency point corresponding to the electronic tag according to the recorded RSSI value.
Specifically, the fine inventory module 21 is specifically configured to:
and taking the primary better working frequency point as a center, and determining a frequency point fine step search interval.
In the specific embodiment of the invention, near the preliminary preferred working frequency point, for example, a range of +/-5 MHz about the preliminary preferred working frequency point is used as a frequency point fine step search interval, the preliminary preferred working frequency point of the tag 1 is assumed to be 910MHz, the preliminary preferred working frequency point of the tag 2 is assumed to be 860MHz, the preliminary preferred working frequency point of the tag 3 is 940MHz, the frequency point fine step search interval of the tag 1 is determined to be 905MHz-915 MHz MHz, the preliminary preferred working frequency point of the tag 2 is determined to be 855MHz-865 MHz, and the preliminary preferred working frequency point of the tag 3 is 935MHz-945 MHz.
Then, for each tag, a frequency point is selected as the transmitting frequency of the reading device in the frequency point fine-step searching interval, the inventory is started to electrify the electronic tag, and the RSSI value returned by the electronic tag is received and recorded.
In the specific embodiment of the invention, taking the tag 1 as an example, the frequency point step search interval is 905MHz-915MHz, then the lower limit frequency point 905MHz of the frequency point step search interval is selected as the current transmitting frequency of the reading device, and the reading device starts to start the inventory to power up the tag 1, and receives and records the RSSI value returned by the tag 1.
And changing the transmitting frequency of the reading device by a second step length, and continuously receiving and recording the RSSI value of the electronic tag checked and read.
In the embodiment of the present invention, the value of the second step is smaller than the first step, for example, the second step is 1MHz, the transmitting frequency of the reading device is changed to 906MHz, the reading device continues to count for a certain period of time, for example, 500ms, the RSSI value of the electronic tag read by the counting device is received and recorded, … …, and the like, and then the reading device performs the counting every time the transmitting frequency of 1MHz is changed until the upper limit 915MHz of the fine step search interval of the frequency point, and records the RSSI value returned by the tag 1 each time.
And finally, determining the optimal working frequency point of the corresponding electronic tag according to the recorded RSSI value.
According to the principle described above, the smaller the absolute value of the RSSI value is, the better the signal is, and the more suitable the current frequency point is considered, so the transmitting frequency when the absolute value of the RSSI value returned by the electronic tag in the frequency point fine-step search interval is minimum is determined as the optimal working frequency point of the corresponding tag, the optimal frequency point is used by the reading device when the electronic tag is subjected to the subsequent read-write operation or the read-temperature operation, and taking tag 1 as an example, if the transmitting frequency of the tag 1 is the minimum when the transmitting frequency of the reading device is 907MHz, the 907MHz is determined as the optimal working frequency point corresponding to tag 1, and the transmitting frequency of 907MHz is used by the subsequent reading device when the tag 1 is subjected to the read-write operation or the read-temperature operation.
Preferably, the reading device capable of automatically searching the optimal working frequency point of the electronic tag according to the present invention further comprises:
The power adjustment module is configured to set the power of the reader to be minimum when the reader is powered on, then start the coarse inventory module 20, gradually increase the power of the reader multiple times after the fine inventory module 21 is finished, restart the coarse inventory module 20 after each power adjustment, automatically search the best operating frequency point of the tag again under the current power, obtain multiple best operating frequency points under different reader powers, and select the best operating frequency point when the reader power is smaller as the best operating frequency point of the corresponding electronic tag.
That is, in the present invention, the maximum power is not used to automatically search the best operating frequency point of the tag when the reader is powered on, but from the low power, the power of the reader is gradually increased to automatically search the best operating frequency point of the tag again after the result is searched, different results are finally obtained under different powers, the result obtained when the power is smaller is used as the final best operating frequency point, for example, when the reader is 25dBm, the best frequency point of the tag 1 is obtained at 91 MHz,30dBm is obtained at 913MHz,33dBm is obtained at 905MHz, and finally, the result obtained when the power is smaller is determined to be the most accurate, that is, 911MHz is used as the best operating frequency point corresponding to the tag 1.
Examples
In this embodiment, as shown in fig. 3, the method for automatically searching the optimal working frequency point of the electronic tag according to the present invention includes the following steps:
first, performing rough inventory: the reader-writer is turned on, fixed frequency emitted by the reader-writer is set, the fixed frequency is increased according to a coarse Step length Step1, the inventory process is started, and the RSSI of the tag read in each fixed frequency is recorded.
The initial fixed frequency is 840MHz, the RFID label is powered on by starting the counting process and lasting for a certain time such as 500ms (the time can be adjusted according to the actual requirement), the RSSI (received signal strength Indication) of the label which is counted and read is recorded, then the fixed frequency of the reader-writer is set to 850MHz, the counting process is started and lasting for a certain time such as 500ms (the time is adjusted according to the actual requirement), the RSSI of the label which is counted and read is recorded, … … is recorded, and then the counting is carried out once every 10MHz until 960MHz is reached, and the RSSI of the label which is returned each time is recorded.
Secondly, performing fine inventory: on the basis of rough inventory, a better working frequency point is determined, searching is carried out at a fine Step length Step2 near the better frequency point (such as a + -5 MHz range), inventory processes are sequentially carried out, and RSSI values of all the frequency points are recorded.
After rough counting with the frequency band interval of 840-960 MHz being 10MHz, the frequency point of the label is approximately better, and subsequent counting with the interval of 1MHz can be performed. For example, after rough counting, the absolute value of the RSSI of the tag 1 is minimum at 910MHz, the absolute value of the RSSI of the tag 2 is minimum at 860MHz, the absolute value of the RSSI of the tag 3 is minimum at 940MHz, and when 1MHz counting is performed, the 1MHz counting can be performed by using 905MHz-915 MHz, 855MHz-865 MHz and 935MHz-945 MHz respectively, and the RSSI of each tag at each frequency point can be recorded.
Thirdly, after checking at 1MHz intervals, the RSSI values of the labels at different frequency points can be compared again to obtain the optimal working frequency point of the corresponding label, and the optimal working frequency point can be used when the label is subjected to read-write operation or read-temperature operation.
In summary, according to the method and the reading device capable of automatically searching the optimal operating frequency point of the electronic tag, when the reading device is powered on, the transmitting frequency of the electronic tag is changed in the operating frequency band interval of the electronic tag in a first step length, the inventory is started, the RSSI returned by each time of the electronic tag is received and recorded, the preliminary optimal operating frequency point of the electronic tag is determined according to the recorded RSSI value, then the frequency point fine step searching interval is determined according to the preliminary optimal operating frequency point, the transmitting frequency of the reading device is changed in the frequency point fine step searching interval in a second step length, the inventory is started, the RSSI value returned by each time of the electronic tag is received and recorded, and the optimal operating frequency point corresponding to the electronic tag is determined according to the recorded RSSI value, so that the aim of automatically searching the optimal operating frequency point of the electronic tag when the reading device is powered on is achieved, and the identification rate of the electronic tag is improved.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, the scope of the invention is to be indicated by the appended claims.

Claims (8)

1. A method capable of automatically searching an optimal working frequency point of an electronic tag comprises the following steps:
Step S1, when a reading device is electrified, changing the transmitting frequency of the reading device in a working frequency band interval of an electronic tag by a first step length, starting counting, and receiving and recording the RSSI value returned by the electronic tag each time;
step S2, determining a preliminary better working frequency point of the electronic tag according to the recorded RSSI value;
Step S3, determining a frequency point fine step searching interval according to the preliminary better working frequency point, changing the transmitting frequency of the reading device and starting counting according to a second step length in the frequency point fine step searching interval, and receiving and recording the RSSI value returned by each electronic tag;
step S4, determining the optimal working frequency point of the corresponding electronic tag according to the recorded RSSI value;
step S5, gradually increasing the power of the reading device, returning to the step S1, and automatically searching the optimal working frequency point of the tag again under the current power to obtain a plurality of optimal working frequency points under different reading powers;
and S6, selecting an optimal working frequency point when the power of the reading device is smaller as an optimal working frequency point of the corresponding electronic tag.
2. The method of claim 1, wherein the step S1 further comprises:
Step S100, when the reading device is electrified, determining an initial transmitting frequency according to a working frequency band interval of the electronic tag to be checked, starting the checking to electrify the electronic tag, and receiving and recording an RSSI value returned by the electronic tag;
step S101, changing the transmitting frequency of the reading device with a first step length, continuously receiving and recording the RSSI values of the electronic tags checked and read, and obtaining the RSSI values returned by the electronic tags under a plurality of transmitting frequencies.
3. The method for automatically searching the optimal working frequency point of the electronic tag according to claim 2, wherein the method comprises the following steps: in step S2, the transmitting frequency when the absolute value of the RSSI returned by the electronic tag is the smallest is determined as the preliminary preferred operating frequency point corresponding to the electronic tag.
4. The method of claim 3, wherein the step S3 further comprises:
step S300, a frequency point fine step searching interval is determined by taking the preliminary better working frequency point as a center;
Step S301, for each tag, selecting a frequency point as the transmitting frequency of the reading device in the frequency point fine step searching interval, starting the inventory to electrify the electronic tag, and receiving and recording the RSSI value returned by the electronic tag;
Step S302, changing the transmitting frequency of the reading device with a second step length, continuously receiving and recording the RSSI value of the electronic tag checked and read.
5. The method for automatically searching the optimal operating frequency point of the electronic tag according to claim 4, wherein the method comprises the following steps: the first step size is larger than the second step size.
6. The method for automatically searching the optimal operating frequency point of the electronic tag according to claim 4, wherein the method comprises the following steps: in step S4, the transmitting frequency when the absolute value of the RSSI returned by the electronic tag in the frequency point fine step search interval is minimum is determined as the best working frequency point of the corresponding tag.
7. The method for automatically searching the optimal operating frequency point of the electronic tag according to claim 6, further comprising the steps of, before step S1:
s0, when the reading device is powered on, setting the power of the reading device to be minimum, and then entering step S1.
8. A reading device capable of automatically searching an optimal working frequency point of an electronic tag comprises:
The coarse checking module is used for changing the transmitting frequency of the electronic tag in the working frequency range of the electronic tag with a first step length and starting checking, receiving and recording the RSSI returned by the electronic tag each time, and determining the primary better working frequency point of the electronic tag according to the recorded RSSI value when the reading device is electrified;
The fine inventory module is used for determining a frequency point fine step search interval according to the preliminary preferred working frequency point, changing the transmitting frequency of the reading device and starting inventory according to a second step length in the frequency point fine step search interval, receiving and recording the RSSI value returned by each electronic tag, and determining the optimal working frequency point corresponding to the electronic tag according to the recorded RSSI value;
the power adjustment module is used for setting the power of the reading device to be minimum when the reading device is electrified, then starting the coarse counting module, gradually increasing the power of the reading device after the fine counting module is finished, restarting the coarse counting module and the fine counting module after each power adjustment, automatically searching the optimal working frequency point of the tag again under the current power to obtain a plurality of optimal working frequency points under different reading device powers, and selecting the optimal working frequency point with smaller reading device power as the optimal working frequency point of the corresponding electronic tag.
CN202110614310.2A 2021-06-02 2021-06-02 Method capable of automatically searching optimal working frequency point of electronic tag and reading device Active CN113283258B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110614310.2A CN113283258B (en) 2021-06-02 2021-06-02 Method capable of automatically searching optimal working frequency point of electronic tag and reading device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110614310.2A CN113283258B (en) 2021-06-02 2021-06-02 Method capable of automatically searching optimal working frequency point of electronic tag and reading device

Publications (2)

Publication Number Publication Date
CN113283258A CN113283258A (en) 2021-08-20
CN113283258B true CN113283258B (en) 2024-04-23

Family

ID=77283192

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110614310.2A Active CN113283258B (en) 2021-06-02 2021-06-02 Method capable of automatically searching optimal working frequency point of electronic tag and reading device

Country Status (1)

Country Link
CN (1) CN113283258B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114724454B (en) * 2022-05-07 2024-05-28 北京智芯半导体科技有限公司 Identification equipment and wind power detection system of shaft tower
CN117081628A (en) * 2023-08-31 2023-11-17 厦门汉印电子技术有限公司 Frequency point determining method and device, printing equipment and storage medium

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101655899A (en) * 2008-08-20 2010-02-24 中兴通讯股份有限公司 Method and system for evaluating radio frequency identification electronic label
CN102054152A (en) * 2009-10-30 2011-05-11 中兴通讯股份有限公司 Radio frequency identification (RFID) tag as well as radio-frequency gain control method and device thereof
CN104156742A (en) * 2014-08-07 2014-11-19 上海实甲智能系统有限公司 Automatic antenna adjusting device
CN104318191A (en) * 2014-10-16 2015-01-28 江苏国光信息产业股份有限公司 UHFRFID (Ultra High Frequency Radio Frequency Identification Device) self-adaptation working method
KR101732426B1 (en) * 2015-10-26 2017-05-24 (주) 네톰 System for Searching RFID Tag AND Method thereof
CN107733472A (en) * 2017-10-26 2018-02-23 江苏本能科技有限公司 The adaptive method to set up of radio frequency identification frequency and system, control device
CN107908991A (en) * 2017-10-27 2018-04-13 中国农业大学 A kind of read method and device of ultrahigh frequency RFID electronic tag
CN109697490A (en) * 2019-01-04 2019-04-30 江苏本能科技有限公司 Radio frequency recognizing electronic label information write-in method and device
CN110414282A (en) * 2019-07-24 2019-11-05 群淂数码科技（上海）有限公司 Analysis system and its frequency-response analysis method based on ultrahigh-frequency tag equipment
CN111967547A (en) * 2020-07-06 2020-11-20 深圳市成为信息技术有限公司 Multi-label checking method, electronic equipment and storage medium

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101655899A (en) * 2008-08-20 2010-02-24 中兴通讯股份有限公司 Method and system for evaluating radio frequency identification electronic label
CN102054152A (en) * 2009-10-30 2011-05-11 中兴通讯股份有限公司 Radio frequency identification (RFID) tag as well as radio-frequency gain control method and device thereof
CN104156742A (en) * 2014-08-07 2014-11-19 上海实甲智能系统有限公司 Automatic antenna adjusting device
CN104318191A (en) * 2014-10-16 2015-01-28 江苏国光信息产业股份有限公司 UHFRFID (Ultra High Frequency Radio Frequency Identification Device) self-adaptation working method
KR101732426B1 (en) * 2015-10-26 2017-05-24 (주) 네톰 System for Searching RFID Tag AND Method thereof
CN107733472A (en) * 2017-10-26 2018-02-23 江苏本能科技有限公司 The adaptive method to set up of radio frequency identification frequency and system, control device
CN107908991A (en) * 2017-10-27 2018-04-13 中国农业大学 A kind of read method and device of ultrahigh frequency RFID electronic tag
CN109697490A (en) * 2019-01-04 2019-04-30 江苏本能科技有限公司 Radio frequency recognizing electronic label information write-in method and device
CN110414282A (en) * 2019-07-24 2019-11-05 群淂数码科技（上海）有限公司 Analysis system and its frequency-response analysis method based on ultrahigh-frequency tag equipment
CN111967547A (en) * 2020-07-06 2020-11-20 深圳市成为信息技术有限公司 Multi-label checking method, electronic equipment and storage medium

Also Published As

Publication number Publication date
CN113283258A (en) 2021-08-20

Similar Documents

Publication Publication Date Title
CN113283258B (en) Method capable of automatically searching optimal working frequency point of electronic tag and reading device
US8362879B2 (en) Apparatus and method for integrated reader and tag
US7982584B2 (en) Mobile RFID reader and control method thereof
CN101957924B (en) A kind of method for testing motion in radio-frequency recognition system and read write line
US8552837B2 (en) Data transmission method and apparatus in RFID and remote sensor systems
WO2009110317A1 (en) Tag information processing device
US20110156907A1 (en) Apparatus for communicating with rfid tag and system for article management
JP2004506907A (en) Tag conflict resolution method and system
US20080048833A1 (en) Rfid reader system aided by rf power of measurement
CN105491650B (en) The power adaptive method of adjustment and system of frequency read/write
Chen et al. An efficient and easy-to-implement tag identification algorithm for UHF RFID systems
CN109241802B (en) Multi-label identification method for mobile RFID system
CN101377820B (en) Method for searching label in radio frequency recognition system and reader-writer
CN103577775A (en) Method for searching for and identifying personal articles through mobile phone
CN110458257B (en) Label checking method and device based on RFID system
JP5061365B2 (en) Non-contact communication medium reading device and non-contact communication medium reading method
US7940161B2 (en) Reader/writer and data communication method
JP4594250B2 (en) Communication device
JP4482941B2 (en) Interrogator for RFID tag communication system, RFID tag circuit element, and RFID tag communication system
CN105743826B (en) A kind of Miller subcarrier coding/decoding method
CN110954864B (en) Positioning method based on RFID technology
US7151437B2 (en) Radio communication system and method, radio communication apparatus and method, and program
CN112580377B (en) Radio frequency power verification method, device, equipment and storage medium
CN110135211A (en) A kind of method and device that can quick and precisely take inventory RFID tag quantity
US7933553B2 (en) Tuneable radio-frequency identification tag reader and method of reading such a tag

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant