CN113283258A - Method and reading device capable of automatically searching optimal working frequency point of electronic tag - Google Patents

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

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Publication number
CN113283258A
CN113283258A CN202110614310.2A CN202110614310A CN113283258A CN 113283258 A CN113283258 A CN 113283258A CN 202110614310 A CN202110614310 A CN 202110614310A CN 113283258 A CN113283258 A CN 113283258A
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frequency point
electronic tag
working frequency
reading device
rssi value
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CN113283258B (en
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张钊锋
苏雪剑
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Shanghai Ilian Iot Co ltd
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Shanghai Ilian Iot Co ltd
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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
    • G06K7/10118—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

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
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  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Near-Field Transmission Systems (AREA)
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Abstract

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

Description

Method and reading device capable of automatically searching optimal working frequency point of electronic tag
Technical Field
The invention relates to the technical field of radio frequency identification, in particular to a method and a reading device capable of automatically searching an optimal working frequency point of an electronic tag.
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 obtains related data by using a radio frequency signal, and has the advantages of wireless read/write identification, strong signal penetration capability, long distance, long service life, good environmental adaptability, simultaneous identification of multiple tags, easy and large information storage, rewritable data and the like, and is widely applied in recent years.
When a traditional RFID label is read and written, an anti-collision compensation test is usually carried out firstly, then each reading device occupies a frequency point to read and write the RFID label, and the label feeds back a signal for demodulation and identification of the reading device.
In order to solve the problem, chinese patent application publication No. CN103902945A proposes a method for improving the RFID tag identification rate by frequency hopping scanning, which specifically comprises the following steps: (1) the RFID tag reading device transmits a reading signal to the RFID tag through a fixed frequency, and the RFID tag feeds back a signal for the RFID tag reading device to identify; (2) when the feedback signal is weak and cannot be identified by the RFID tag reading device in step (1), the RFID tag reading device transmits a reading signal to the RFID tag through frequency hopping continuous scanning, the RFID tag feeds back continuous signals for the RFID tag reading device to identify, and there is an obvious signal difference between the continuous signals, and the RFID tag reading device captures a fine signal by continuously comparing the change values of the two received signals before and after the frequency hopping, so as to read tag data.
Disclosure of Invention
In order to overcome the defects in the prior art, the present invention provides a method and a reading device capable of automatically searching an optimal operating frequency point of an electronic tag, so as to achieve the purpose of automatically searching the optimal operating frequency point of the electronic tag only when the reading device is powered on, thereby improving the identification 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 the reading device is powered on, changing the transmitting frequency of the electronic tag in the working frequency band interval of the electronic tag by a first step length, starting inventory, receiving and recording the RSSI value returned by the electronic tag every time;
step S2, determining a preliminary better working frequency point of the electronic tag according to the recorded RSSI value;
step S3, determining a fine search interval of the frequency point according to the primary better working frequency point, changing the transmitting frequency of the reading device in the fine search interval of the frequency point by a second step length, starting inventory, and receiving and recording the RSSI value returned by the electronic tag each time;
and step S4, determining the optimal working frequency point corresponding to the electronic tag according to the recorded RSSI value.
Preferably, the step S1 further includes:
step S100, when the reading device is powered on, determining an initial transmitting frequency according to a working frequency band interval of the electronic tag to be checked, starting the checking to power on the electronic tag, and receiving and recording an RSSI value returned by the electronic tag;
and step S101, changing the transmission frequency of the reading device by the first step length, continuously receiving and recording the RSSI value of the electronic tag read by the inventory, and obtaining the RSSI value returned by the electronic tag under a plurality of transmission frequencies.
Preferably, in step S2, the transmission frequency when the RSSI absolute value returned by the electronic tag is the minimum is determined as the preliminary better working frequency point corresponding to the electronic tag.
Preferably, the step S3 further includes:
step S300, determining a frequency point fine step search interval by taking the preliminary better working frequency point as a center;
step S301, selecting a frequency point in a frequency point fine step search interval of each tag as a transmitting frequency of a reading device, starting an opening inventory to electrify the electronic tag, and receiving and recording an RSSI value returned by the electronic tag;
and step S302, 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 read by the inventory.
Preferably, the first step size is greater than the second step size.
Preferably, in step S4, the transmitting frequency when the RSSI absolute value returned by the electronic tag in the frequency point fine step search interval is the minimum is determined as the optimal working frequency point of the corresponding tag.
Preferably, before step S1, the method further includes the following steps:
s0, when the reader is powered on, its power is set to minimum, and then it goes to step S1.
Preferably, after step S4, the method further includes the following steps:
and step S5, gradually increasing the power of the reading device, returning to step S1, and automatically searching the optimal working frequency point of the label under the current power to obtain a plurality of optimal working frequency points under different powers of the reading device.
And step S6, selecting the optimal working frequency point when the power of the reading device is smaller as the optimal working frequency point of the corresponding electronic tag.
In order to achieve the above object, the present invention further provides a reading apparatus capable of automatically searching an optimal operating frequency point of an electronic tag, including:
the rough checking module is used for changing the transmitting frequency of the electronic tag in a working frequency band interval of the electronic tag by a first step length and starting checking when the reading device is powered on, receiving and recording the RSSI returned by the electronic tag each time, and determining a preliminary better working frequency point of the electronic tag according to the recorded RSSI value;
and the fine checking module is used for determining a frequency point fine step searching interval according to the primary better working frequency point, changing the transmitting frequency of the reading device in the frequency point fine step searching interval by a second step length, starting checking, receiving and recording the RSSI value returned by the electronic tag every time, and determining the best working frequency point corresponding to the electronic tag according to the recorded RSSI value.
Preferably, the reading apparatus further comprises:
and the power adjusting module is used for setting the power of the reading device to be minimum when the reading device is powered on, then starting the rough checking module, gradually increasing the power of the reading device for multiple times after the fine checking module is finished, restarting the rough checking module after the power is adjusted every time, automatically searching the optimal working frequency point of the label again under the current power to obtain multiple optimal working frequency points under different power of the reading device, and selecting the optimal working frequency point with smaller power of the reading device as the optimal working frequency point of the corresponding electronic label.
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 electronic tag is firstly changed in the working frequency band section of the electronic tag in a first step length, the inventory is started, the RSSI returned by the electronic tag every time is received and recorded, the primary better working frequency point of the electronic tag is determined according to the recorded RSSI value, then the fine frequency point searching section is determined according to the primary better working frequency point, the transmitting frequency of the reading device is changed in the fine frequency point searching section in a second step length, the inventory is started, the RSSI value returned by the electronic tag every time is received and recorded, the optimal working frequency point of the corresponding electronic tag is determined according to the recorded RSSI value, the optimal working frequency point of the electronic tag is automatically searched when the reading device is powered on, and the aim of improving the identification rate of the electronic tag is fulfilled.
Drawings
FIG. 1 is a flowchart illustrating 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 reading apparatus 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 capabilities of the present invention will be readily apparent to those skilled in the art from the present disclosure by describing the embodiments of the present invention with specific embodiments thereof in conjunction with the accompanying drawings. The invention is capable of other and different embodiments and its several details are capable of modification in various other respects, all without departing from the spirit and scope of the present invention.
Fig. 1 is a flowchart illustrating 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 of the present invention includes the following steps:
step S1, when the reading device is powered on, change the transmission frequency of the electronic tag in the working frequency range of the electronic tag by the first step length, start the inventory, and receive and record the RSSI (Received Signal Strength Indication) returned by the electronic tag each time.
The invention is based on the principle that: when a reading device, such as a reader-writer, fixedly works at a certain frequency point to count tags, the tags have different RSSI values returned by different frequency points, and the smaller the absolute value of the RSSI value (generally, a negative value such as-95 dBm) is, the better the signal is, and the more appropriate the current frequency point is.
Specifically, step S1 further includes:
step S100, when the reading device is powered on, determining an initial transmitting frequency according to the working frequency band interval of the electronic tag to be checked, starting 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 present invention, assuming that the operating frequency band of the electronic tag for counting is 840MHz-960MHz, the lower limit of the operating frequency band may be selected as the initial transmitting fixed frequency of the reading device, for example, 840MHz, and certainly, the initial transmitting fixed frequency may also be selected as 960MHz, which is not limited in the present invention.
When the initial transmission frequency of the reading device is determined to be 840MHz, the reading device starts an inventory starting process to electrify the electronic tag, starts an inventory process for a certain time such as 500ms, and receives and records the RSSI (Received Signal Strength Indication) value of the electronic tag read by the inventory.
Step S101, changing the transmission frequency of the reading device by the first step length, and continuously receiving and recording the RSSI (Received Signal Strength Indication) value of the electronic tag read by the inventory.
In the embodiment of the present invention, assuming that the first step is 10MHz, the transmission frequency of the reading device is changed to 850MHz, the inventory is continued for a certain time, for example, 500ms, the RSSI value of the electronic tag read by the inventory is received and recorded, … …, and so on, and then the inventory is performed every 10MHz until the upper limit of the frequency band of the electronic tag is 960MHz, and the RSSI value returned by the electronic tag each time is recorded.
And step S2, determining a preliminary better working frequency point of the electronic tag according to the recorded RSSI value.
Generally, the smaller the absolute value of the RSSI value is, the better the signal is, and the more suitable the current frequency point is, therefore, in the specific embodiment of the present invention, the transmission frequency at which the absolute value of the returned RSSI value of the electronic tag is the smallest is determined as the primary better working frequency point. For example, if the RSSI absolute value of tag 1 is the smallest at 910MHz, the RSSI absolute value of tag 2 is the smallest at 860MHz, and the RSSI absolute value of tag 3 is the smallest at 940MHz, the preliminary preferred working frequency point of tag 1 is 910MHz, the preliminary preferred working frequency point of tag 2 is 860MHz, and the preliminary preferred working frequency point of tag 3 is 940 MHz.
And step S3, determining a frequency point fine step search interval according to the primary better working frequency point, changing the transmitting frequency of the reading device in the frequency point fine step search interval by a second step length, starting inventory, and receiving and recording the RSSI value returned by the electronic tag every time.
Specifically, step S3 further includes:
and step S300, determining a frequency point fine search interval by taking the primary better working frequency point as a center.
In the specific embodiment of the present invention, near the preliminary better working frequency point, for example, a range of ± 5MHz with the preliminary better working frequency point as a center is used as a frequency point step search interval, assuming that the preliminary better working frequency point of the tag 1 is 910MHz, the preliminary better working frequency point of the tag 2 is 860MHz, and the preliminary better working frequency point of the tag 3 is 940MHz, it is determined that the frequency point step search interval of the tag 1 is 905MHz-915MHz, the preliminary better working frequency point of the tag 2 is 855MHz-865 MHz, and the preliminary better working frequency point of the tag 3 is 935MHz-945 MHz.
Step S301, for each tag, selecting a frequency point in the frequency point fine step search interval as the transmitting frequency of the reading device, starting the inventory to electrify the electronic tag, and receiving and recording the RSSI value returned by the electronic tag.
In the specific embodiment of the invention, taking the tag 1 as an example, if the fine step search interval of the frequency point is 905MHz-915MHz, the lower limit frequency point 905MHz of the fine step search interval of the frequency point is selected as the current transmitting frequency of the reading device, the reading device starts the inventory to power on the tag 1, and the RSSI value returned by the tag 1 is received and recorded.
And step S302, 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 read by the inventory.
In the specific embodiment of the present invention, the value of the second step length should be smaller than the first step length, for example, if the second step length is 1MHz, the transmission frequency of the reading device is changed to 906MHz, the counting is continued for a certain time, for example, 500ms, the RSSI value of the electronic tag read by the counting is received and recorded, … …, and so on, after that, the reading device performs counting every time the transmission frequency of 1MHz is changed, until the upper limit of the fine step search interval of the frequency point is 915MHz, and the RSSI value returned by each tag 1 is recorded.
And step S4, determining the optimal working frequency point corresponding to the 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, so that the transmission frequency when the absolute value of the RSSI value returned by the electronic tag in the frequency point fine search interval is the smallest is determined as the optimal working frequency point of the corresponding tag, the reading device uses the optimal frequency point when the electronic tag is subsequently subjected to read-write operation or temperature reading operation, taking tag 1 as an example, assuming that the absolute value of the RSSI returned when the transmission frequency of the reading device is 907MHz is the smallest, 907MHz is determined as the optimal working frequency point corresponding to tag 1, and the transmission frequency of 907MHz is used when the subsequent reading device is subjected to read-write operation or temperature reading operation on tag 1.
In the present invention, when the tag frequency point search is performed through steps S1 to S4, RSSI values of tags at multiple frequency points may not be obvious due to reasons such as a large power of a reader, which may cause the searched frequency points to be inaccurate, and therefore, preferably, before step S1, the method for automatically searching an optimal operating frequency point of an electronic tag of the present invention further includes the following steps:
s0, when the reader is powered on, its power is set to minimum, and then it goes to step S1.
Correspondingly, after step S4, the method further includes the following steps:
and step S5, gradually increasing the power of the reading device, returning to step S1, and automatically searching the optimal working frequency point of the label under the current power to obtain a plurality of optimal working frequency points under different powers of the reading device.
And step S6, selecting the optimal working frequency point when the power of the reading device is smaller as the 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 optimal working frequency point of the tag when the reader is powered on, but the power of the reader is gradually increased after the result is searched from the low power, and then the optimal working frequency point of the tag is automatically searched once again, and finally different results are obtained under different powers, and the result with the lower power is used as the final optimal working frequency point, for example, the optimal frequency point of the tag 1 is 911MHz when the reader is 25dBm, the optimal frequency point of the tag 1 is 913MHz when the reader is 30dBm, the optimal frequency point of the tag 1 is 905MHz when the reader is 33dBm, and finally the result with the lower power is determined to be the most accurate, that is, 911MHz is used as the optimal working frequency point corresponding to the tag 1, and thus the purpose is that the total number of the tags and the distance between the tag and the antenna are not known in advance, if only the tag with the lowest power and possibly far away from the weak signal is used, if the maximum power automatic search is used at first, the RSSI values of the tags at a plurality of frequency points are not obvious, so that the searched frequency points are inaccurate, and therefore, the power of the reading device is minimized firstly, and the power is gradually increased, so that all tags are guaranteed to be read completely.
Fig. 2 is a system architecture diagram of a reading apparatus 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 apparatus capable of automatically searching the optimal operating frequency point of an electronic tag according to the present invention includes:
the rough checking module 20 is configured to change the transmission frequency of the electronic tag in a working frequency range of the electronic tag by a first step length and start checking 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 better working frequency point of the electronic tag according to the recorded RSSI.
The invention is based on the principle that: when the reading device fixedly works at a certain frequency point to count the tags, the tags have different RSSI values returned by different frequency points, and the smaller the absolute value of the RSSI value (generally, a negative value such as-95 dBm) is, the better the signal is, and the more appropriate the current frequency point is.
Specifically, the rough inventory module 20 is specifically configured to:
when the reading device is powered on, determining the initial transmitting frequency according to the working frequency band interval of the electronic tag to be checked, starting the checking to power on the electronic tag, and receiving and recording the RSSI value returned by the electronic tag.
In the specific embodiment of the present invention, assuming that the operating frequency band of the electronic tag that is checked by the reading device is 840MHz-960MHz, the lower limit of the operating frequency band may be selected as the initial transmitting fixed frequency of the reading device, for example, 840MHz, and certainly, the initial transmitting fixed frequency may also be selected as 960MHz, which is not limited in the present invention.
When the initial transmission frequency of the reading device is determined to be 840MHz, the reading device starts an inventory starting process to electrify the electronic tag, starts an inventory process for a certain time such as 500ms, and receives and records the RSSI (Received Signal Strength Indication) value of the electronic tag read by the inventory.
Then, the transmission frequency of the reading device is changed by the first step length, and the RSSI (Received Signal Strength Indication) value of the electronic tag read by the inventory is continuously Received and recorded.
In the embodiment of the present invention, assuming that the first step is 10MHz, the transmission frequency of the reading device is changed to 850MHz, the inventory is continued for a certain time, for example, 500ms, the RSSI value of the electronic tag read by the inventory is received and recorded, … …, and so on, and then the inventory is performed every 10MHz until the upper limit of the frequency band of the electronic tag is 960MHz, and the RSSI value returned by the electronic tag each time is recorded.
And finally, determining a primary better working frequency point of the electronic tag according to the recorded RSSI value.
Generally, the smaller the absolute value of the RSSI value is, the better the signal is, and the more suitable the current frequency point is, so that the transmission frequency with the smallest absolute value of the RSSI value of the returned electronic tag is determined as a primary better working frequency point. For example, if the RSSI absolute value of tag 1 is the smallest at 910MHz, the RSSI absolute value of tag 2 is the smallest at 860MHz, and the RSSI absolute value of tag 3 is the smallest at 940MHz, the preliminary preferred working frequency point of tag 1 is 910MHz, the preliminary preferred working frequency point of tag 2 is 860MHz, and the preliminary preferred working frequency point of tag 3 is 940 MHz.
And the fine checking module 21 is configured to determine a frequency point fine search interval according to the preliminary better working frequency point, change the transmission frequency of the reading device in the frequency point fine search interval by a second step length, start checking, receive and record an RSSI value returned by the electronic tag each time, and determine the best working frequency point corresponding to the electronic tag according to the recorded RSSI value.
Specifically, the fine inventory module 21 is specifically configured to:
and determining the fine searching interval of the frequency point by taking the initial better working frequency point as the center.
In the specific embodiment of the present invention, near the preliminary better working frequency point, for example, a range of ± 5MHz with the preliminary better working frequency point as a center is used as a frequency point step search interval, assuming that the preliminary better working frequency point of the tag 1 is 910MHz, the preliminary better working frequency point of the tag 2 is 860MHz, and the preliminary better working frequency point of the tag 3 is 940MHz, it is determined that the frequency point step search interval of the tag 1 is 905MHz-915MHz, the preliminary better working frequency point of the tag 2 is 855MHz-865 MHz, and the preliminary better working frequency point of the tag 3 is 935MHz-945 MHz.
Then, for each tag, selecting a frequency point in the frequency point fine search interval as the transmitting frequency of the reading device, starting inventory to electrify the electronic tag, and receiving and recording the RSSI value returned by the electronic tag.
In the specific embodiment of the invention, taking the tag 1 as an example, if the fine step search interval of the frequency point is 905MHz-915MHz, the lower limit frequency point 905MHz of the fine step search interval of the frequency point is selected as the current transmitting frequency of the reading device, the reading device starts to start the inventory to electrify the tag 1, and the RSSI value returned by the tag 1 is received and recorded.
And changing the transmitting frequency of the reading device in a second step, and continuously receiving and recording the RSSI value of the electronic tag read by the inventory.
In the specific embodiment of the present invention, the value of the second step length should be smaller than the first step length, for example, if the second step length is 1MHz, the transmission frequency of the reading device is changed to 906MHz, the counting is continued for a certain time, for example, 500ms, the RSSI value of the electronic tag read by the counting is received and recorded, … …, and so on, after that, the reading device performs counting every time the transmission frequency of 1MHz is changed, until the upper limit of the fine step search interval of the frequency point is 915MHz, and the RSSI value returned by each tag 1 is recorded.
And finally, determining the optimal working frequency point corresponding to the 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, and therefore, the transmission frequency at the time when the absolute value of the RSSI value returned by the electronic tag in the frequency point fine search interval is the smallest is determined as the optimal working frequency point of the corresponding tag, and the reading device uses the optimal frequency point when the electronic tag is subsequently subjected to read-write operation or temperature reading operation, taking tag 1 as an example, and assuming that the RSSI value returned when the transmission frequency of the reading device is 907MHz is the smallest, 907MHz is determined as the optimal working frequency point corresponding to tag 1, and the transmission frequency of 907MHz is used when the subsequent reading device is subjected to read-write operation or temperature reading operation on tag 1.
Preferably, the reading apparatus capable of automatically searching for an optimal operating frequency point of an electronic tag according to the present invention further includes:
and the power adjusting module is used for setting the power of the reading device to be minimum when the reading device is powered on, then starting the rough checking module 20, gradually increasing the power of the reading device for multiple times after the fine checking module 21 is finished, restarting the rough checking module 20 after the power is adjusted every time, automatically searching the optimal working frequency point of the label again under the current power to obtain multiple optimal working frequency points under different power of the reading device, and selecting the optimal working frequency point with smaller power of the reading device as the optimal working frequency point of the corresponding electronic label.
That is, in the present invention, the maximum power is not used to automatically search the optimal operating frequency point of the tag when the reader is powered on, but the power of the reader is gradually increased from the low power, and the optimal operating frequency point of the tag is automatically searched again, so that different results are finally obtained at different powers, and the result with the lower power is used as the final optimal operating frequency point, for example, the optimal frequency point of the tag 1 is 911MHz when the reader is 25dBm, the optimal frequency point of the tag 1 is 913MHz when the reader is 30dBm, the optimal frequency point of the tag 1 is 905MHz when the reader is 33dBm, and finally the result with the lower power is determined to be the most accurate, that is, 911MHz is used as the optimal 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:
firstly, performing rough inventory: and opening the reader-writer, setting the fixed frequency transmitted by the reader-writer, increasing according to the Step size Step1, starting an inventory process, and recording the RSSI of the label read at each fixed frequency.
The initial fixed frequency is 840MHz, starting the inventory to electrify the RFID label, starting the inventory process for a certain time such as 500ms (the time can be adjusted according to actual needs), recording the RSSI (Received Signal Strength Indication) of the label read by the inventory, then setting the fixed frequency of the reader-writer to 850MHz, starting the inventory process for a certain time such as 500ms (the time is adjusted according to actual needs), recording the RSSI of the label read by the inventory, … …, performing the inventory every 10MHz till 960MHz, and recording the RSSI returned to the label each time.
Secondly, performing fine inventory: on the basis of rough checking, a better working frequency point is determined, searching is carried out near the better frequency point (such as a range of +/-5 MHz) in a fine Step2, checking processes are carried out in sequence, and the RSSI value of each frequency point is recorded.
After rough counting with the frequency band interval of 840MHz-960MHz of 10MHz, the frequency point of the label with better performance can be obtained, and then counting with the interval of 1MHz can be carried out. For example, after rough inventory, the absolute value of RSSI of the tag 1 at 910MHz is the smallest, the absolute value of RSSI of the tag 2 at 860MHz is the smallest, and the absolute value of RSSI of the tag 3 at 940MHz is the smallest, so that inventory at intervals of 1MHz can be performed by using 905MHz-915MHz, 855MHz-865 MHz, and 935MHz-945 MHz respectively when inventory at intervals of 1MHz is performed, and the RSSI value of each tag at each frequency point is recorded.
And thirdly, after checking at the interval of 1MHz, obtaining the optimal working frequency point of the corresponding label by comparing the RSSI values of the label at different frequency points again, and using the optimal working frequency point when reading and writing the label or reading the temperature.
In summary, when the reading device is powered on, the transmitting frequency of the electronic tag is changed in a first step length in a working frequency band interval of the electronic tag and the inventory is started, the RSSI returned by the electronic tag each time is received and recorded, a preliminary better working frequency point of the electronic tag is determined according to the recorded RSSI value, a fine frequency point search interval is determined according to the preliminary better working frequency point, the transmitting frequency of the reading device is changed in the fine frequency point search interval in a second step length and the inventory is started, the RSSI returned by the electronic tag each time is received and recorded, the best working frequency point of the corresponding electronic tag is determined according to the recorded RSSI value, and the purpose of automatically searching the best working frequency point of the electronic tag when the reading device is powered on is achieved, so that the identification rate of the electronic tag is improved.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Therefore, the scope of the invention should be determined from the following claims.

Claims (10)

1. A method for automatically searching the optimal working frequency point of an electronic tag comprises the following steps:
step S1, when the reading device is powered on, changing the transmitting frequency of the electronic tag in the working frequency band interval of the electronic tag by a first step length, starting inventory, receiving and recording the RSSI value returned by the electronic tag every time;
step S2, determining a preliminary better working frequency point of the electronic tag according to the recorded RSSI value;
step S3, determining a fine search interval of the frequency point according to the primary better working frequency point, changing the transmitting frequency of the reading device in the fine search interval of the frequency point by a second step length, starting inventory, and receiving and recording the RSSI value returned by the electronic tag each time;
and step S4, determining the optimal working frequency point corresponding to the electronic tag according to the recorded RSSI value.
2. The method as claimed in claim 1, wherein the step S1 further includes:
step S100, when the reading device is powered on, determining an initial transmitting frequency according to a working frequency band interval of the electronic tag to be checked, starting checking to power on the electronic tag, and receiving and recording an RSSI value returned by the electronic tag;
and step S101, changing the transmission frequency of the reading device by the first step length, continuously receiving and recording the RSSI value of the electronic tag read by the inventory, and obtaining the RSSI value returned by the electronic tag under a plurality of transmission 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 transmission frequency when the RSSI absolute value returned by the electronic tag is the minimum is determined as the preliminary better working frequency point corresponding to the electronic tag.
4. The method as claimed in claim 3, wherein the step S3 further includes:
step S300, determining a frequency point fine step search interval by taking the preliminary better working frequency point as a center;
step S301, selecting a frequency point in a frequency point fine step search interval of each tag as a transmitting frequency of a reading device, starting inventory to electrify the electronic tag, and receiving and recording an RSSI value returned by the electronic tag;
and step S302, 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 read by the inventory.
5. The method for automatically searching the optimal working frequency point of the electronic tag according to claim 4, wherein the method comprises the following steps: the first step size is greater than the second step size.
6. The method for automatically searching the optimal working 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 RSSI absolute value returned by the electronic tag in the frequency point fine step search interval is the minimum is determined as the optimal working frequency point of the corresponding tag.
7. The method for automatically searching the best working frequency point of the electronic tag according to claim 6, wherein before the step S1, the method further comprises the following steps:
s0, when the reader is powered on, its power is set to minimum, and then it goes to step S1.
8. The method according to claim 7, further comprising the following steps after step S4:
and step S5, gradually increasing the power of the reading device, returning to step S1, and automatically searching the optimal working frequency point of the label under the current power to obtain a plurality of optimal working frequency points under different reading powers.
And step S6, selecting the optimal working frequency point when the power of the reading device is smaller as the optimal working frequency point of the corresponding electronic tag.
9. A reading device capable of automatically searching the optimal working frequency point of an electronic tag comprises:
the rough checking module is used for changing the transmitting frequency of the electronic tag in a working frequency band interval of the electronic tag by a first step length and starting checking when the reading device is powered on, receiving and recording the RSSI returned by the electronic tag each time, and determining a preliminary better working frequency point of the electronic tag according to the recorded RSSI value;
and the fine checking module is used for determining a frequency point fine step searching interval according to the primary better working frequency point, changing the transmitting frequency of the reading device in the frequency point fine step searching interval by a second step length, starting checking, receiving and recording the RSSI value returned by the electronic tag every time, and determining the best working frequency point corresponding to the electronic tag according to the recorded RSSI value.
10. The apparatus for automatically searching for the best operating frequency point of an electronic tag according to claim 9, wherein the apparatus for reading further comprises:
and the power adjusting module is used for setting the power of the reading device to be minimum when the reading device is powered on, then starting the rough checking module, gradually increasing the power of the reading device for multiple times after the fine checking module is finished, restarting the rough checking module and the fine checking module after the power is adjusted every time, automatically searching the optimal working frequency point of the label again under the current power to obtain multiple optimal working frequency points under different power of the reading device, and selecting the optimal working frequency point with smaller power of the reading device as the optimal working frequency point of the corresponding electronic label.
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