CN113326707B - Method and equipment for identifying mobile RFID (radio frequency identification) tag - Google Patents
Method and equipment for identifying mobile RFID (radio frequency identification) tag Download PDFInfo
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Abstract
The invention relates to a method for identifying a mobile RFID label, which comprises the following steps: the reader acquires and records the label information of a plurality of mobile RFID labels for a plurality of times within a specified time; constructing a credibility scoring function based on the label information by using a time attenuation function; and inputting the tag information into a credibility scoring function to obtain the credibility score of each mobile RFID tag, and identifying the mobile RFID tag closest to the reader at present according to the credibility score. The method and the device can acquire and record the tag information for multiple times, can effectively reduce the influence caused by missed identification of the RFID tag, construct a credibility scoring function based on the tag information by using the time attenuation function, and comprehensively consider the factors of reading time, signal strength value and reading times, so that the obtained credibility scoring can reflect the credibility of each piece of tag information practically to obtain the credibility scoring of the RFID tag, thereby realizing accurate identification of the RFID tag.
Description
Technical Field
The invention relates to a method and equipment for identifying a mobile RFID (radio frequency identification) tag, belonging to the field of RFID identification.
Background
The RFID label is widely applied to the fields of production line management, warehouse management, logistics management and the like, and has the function of identifying articles as a data carrier: generally, an RFID tag (also called a radio frequency tag) is arranged on an article in advance, a corresponding relationship between the RFID tag and the article is established, and related information of the article is recorded; in subsequent management, the electronic code of the RFID tag is read by the reader, the RFID tag is identified, and the article is identified by the correspondence of the RFID tag to the article. In some application scenarios (e.g., sorting, handling), the articles are in a moving state, and the RFID tags move along with the articles, for example, the articles pass through an identification device (e.g., a gantry) arranged on the sorting turntable one by one, and the gantry reads the RFID tags on the articles one by one to identify the articles.
Identifying a moving RFID tag has the following problems: 1. since the RFID tag is read by range, signals generated by the RFID tag around the object to be identified, signals remaining in the previous RFID tag, and the like all affect the RFID tag identification (that is, the reader misreads other RFID tags), thereby causing the false detection of the object. 2. The recognition rate of the RFID label signal is influenced by the shape and the placement angle of the article, and the condition that the RFID label cannot be read is easy to occur, so that the article is missed to be detected.
A patent "conveying object identification system, conveying object identification method, and conveying object identification program" with publication No. CN108698761B discloses the following: the pallet identification device is used for identifying a pallet which is attached with an RFID label and is being carried by a forklift, and comprises an acquisition part, an identification part and an output part, wherein the acquisition part acquires a label ID which is obtained by reading at least a plurality of times by an RFID reader arranged on the forklift within a specified reading time at least including the time when the forklift moves, and label information of the reading time; an identification unit that identifies the tag ID of an RFID tag attached to a pallet being transported by a forklift, based on at least one of the read frequency, the interval between read times, and the continuity of reading for each RFID tag identified by the tag ID within a predetermined read time; the output unit outputs the identified tag ID. This patent identifies RFID tags based on differences in reading frequency, interval between reading times, and reading continuity between RFID tags in motion, but the differences are not fully utilized, and the accuracy of identification needs to be further improved.
Disclosure of Invention
In order to solve the problem that the identification accuracy of the RFID tag in the moving process is not high enough in the prior art, the invention provides a method and equipment for identifying the mobile RFID tag.
The technical scheme of the invention is as follows:
the first technical scheme is as follows:
a method of identifying a mobile RFID tag, comprising the steps of:
the method comprises the following steps that a reader acquires and records label information of a plurality of mobile RFID labels for a plurality of times within appointed time, wherein the label information comprises identification information of the RFID labels, the time for reading the RFID labels, the number of times for reading the RFID labels and signal intensity values of the RFID labels;
constructing a credibility scoring function based on the label information by using a time attenuation function;
and inputting the tag information into a credibility scoring function to obtain the credibility score of each mobile RFID tag, and confirming the identity of the mobile RFID tag closest to the reader at present according to the identification information of the RFID tag corresponding to the maximum credibility score.
Further, the credibility score function is as follows:
wherein m is score Representing the credibility score of a certain mobile RFID label, N representing the total number of label information corresponding to the RFID label, T n A time difference between a read time and an end read time in nth tag information representing the RFID tag,
an absolute value representing an average value of signal strengths among all the tag information of the RFID tag, C n The number of times of reading in the nth tag information of the RFID tag is indicated, and a and b are fixed parameters.
Further, a threshold value is preset, if the ith maximum value in the credibility scores of the RFID tags exceeds the threshold value, the tag information is tried to be obtained and recorded again, and the mobile RFID tag closest to the reader is identified again; and otherwise, confirming the identity of the mobile RFID label closest to the reader at present according to the identification information of the RFID label corresponding to the maximum credibility score.
Before the label information is input into the credibility scoring function, the K label information with the maximum signal intensity value is reserved for the label information with the same identification information, and other label information is deleted.
Further, the method also comprises the steps of setting a finishing RFID label at a certain position; and stopping obtaining the label information after the reader reads the finished RFID label.
Further, the method comprises the steps of arranging the mobile RFID tag on an article, wherein the mobile RFID tag moves along with the movement of the article; the identification information of the mobile RFID tag is article identification information, or a one-to-one correspondence relationship between the identification information and the article identification information is established.
The second technical scheme is as follows:
an RFID-based item identification device comprising a memory and a processor, the memory storing instructions adapted to be loaded by the processor and to perform the steps of:
the method comprises the steps that tag information of a plurality of mobile RFID tags is obtained and recorded for a plurality of times within appointed time, wherein the tag information comprises identification information of the RFID tags, the read time of the RFID tags, the read times of the RFID tags and the signal intensity value of the RFID tags;
constructing a credibility scoring function based on the label information by using a time attenuation function;
and inputting the tag information into a credibility scoring function to obtain the credibility score of each mobile RFID tag, and confirming the identity of the mobile RFID tag closest to the reader at present according to the identification information of the RFID tag corresponding to the maximum credibility score.
Further, the reliability scoring function is:
wherein m is score Representing the credibility score of a certain mobile RFID label, N representing the total number of label information corresponding to the RFID label, T n A time difference between a read time and an end read time in nth tag information representing the RFID tag,
an absolute value of an average value of signal strengths in all the tag information representing the RFID tag,C n the number of times of reading in the nth tag information of the RFID tag is represented, and a and b are fixed parameters.
Further, a threshold value is preset, if the ith maximum value in the credibility scores of the RFID tags exceeds the threshold value, the tag information is tried to be obtained and recorded again, and the mobile RFID tag closest to the reader at present is identified again; and otherwise, confirming the identity of the mobile RFID label closest to the reader at present according to the identification information of the RFID label corresponding to the maximum credibility score.
Before the label information is input into the credibility scoring function, the K label information with the maximum signal intensity value is reserved for the label information with the same identification information, and other label information is deleted.
Further, the method also comprises the steps of setting a finishing RFID label at a certain position; and stopping obtaining the label information after the reader reads the finished RFID label.
Further, the method comprises the steps of arranging the mobile RFID tag on an article, wherein the mobile RFID tag moves along with the movement of the article; the identification information of the mobile RFID tag is article identification information, or a one-to-one correspondence relationship between the identification information and the article identification information is established.
The invention has the following beneficial effects:
1. the invention can acquire and record the label information for many times, and can effectively reduce the influence caused by missed identification of the RFID label.
2. According to the method, the time decay function is utilized to construct the credibility scoring function based on the tag information, the factors such as the reading time, the signal strength value and the reading times are comprehensively considered, the obtained credibility scoring can reflect the credibility of each piece of tag information practically, the credibility scoring of the RFID tag is obtained, and therefore the RFID tag is identified accurately.
3. According to the invention, the credibility scores of all RFID labels which can be read by the reader are calculated, and whether stronger interference signals exist around the RFID labels is judged according to the credibility scores, so that the occurrence of false detection can be effectively avoided, and the identification accuracy is further improved.
4. According to the signal intensity value, the obtained label information is filtered, most of interference signals are screened out, the accuracy of subsequent calculation of the credibility score of the RFID label is facilitated, and the identification accuracy is improved.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic diagram of tag information in the present invention;
FIG. 3 is a schematic diagram of filtering tag information in the present invention;
FIG. 4 is a schematic view of a reader and RFID tag location;
FIG. 5 is a schematic diagram of the fifth embodiment.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
Example one
Referring to fig. 1, a method of identifying a mobile RFID tag includes the steps of:
the reader acquires and records tag information (refer to fig. 2) of a plurality of mobile RFID tags for a plurality of times within a specified time, where the tag information includes identification information of the RFID tag (in this embodiment, the identification information is an electronic code of the RFID tag), a time when the RFID tag is read (in this embodiment, the time when the RFID tag is read is recorded in the form of a timestamp), a number of times the RFID tag is read, and a signal intensity value of the RFID tag;
constructing a credibility scoring function based on the label information by using a time attenuation function;
and inputting the tag information into a credibility scoring function to obtain the credibility score of each mobile RFID tag, and confirming the identity of the mobile RFID tag closest to the reader at present according to the identification information of the RFID tag corresponding to the maximum credibility score.
The beneficial effect of this embodiment lies in:
1. the invention can acquire and record label information for many times, and can effectively reduce the influence caused by omitting to identify the RFID label;
2. according to the method, the time attenuation function is utilized to construct the credibility scoring function based on the label information, the factors of reading time, signal intensity value and reading times are comprehensively considered, the obtained credibility scoring can reflect the credibility of each RFID label practically, and therefore accurate identification of the RFID labels is achieved.
Example two
In this embodiment, the confidence score function is constructed as:
wherein m is score Representing the credibility score of a certain RFID label, N representing the total number of label information corresponding to the RFID label, T n A time difference between a read time and an end time in the nth tag information representing the RFID tag,
an absolute value representing an average value of signal strengths among all the tag information of the RFID tag, C n The number of times of reading in the nth tag information of the RFID tag is represented, and a and b are fixed parameters.
The function constructed by the invention is an accumulation function, and the credibility score of the RFID label is obtained by accumulating the credibility scores of all label information of the RFID label.
In this function:
1. in the case where other conditions are not changed, the closer the reading time of the tag information is to the end moving time (i.e., T) n Smaller), its confidence score increases exponentially;
2. the larger the average value of the signal strength of all the valid information of the RFID tag is (since the signal strength value output by the reader is negative, the larger the average value of the signal strength is,
the smaller) the confidence score increases exponentially.
3. With other conditions unchanged, the more times an RFID tag is read, the greater its confidence score increases linearly.
In conclusion, the advantages are mainly reflected in that:
referring to fig. 4, the RFID tag to be identified is generally moved toward the reader, and during the movement of the RFID tag, tag information of different RFID tags acquired by the reader is
C n And N, etc. And the confidence score function can further amplify this difference:
1. exponential amplification of tag information using time decay function exp
A difference in aspect;
2. the tag information obtained later in the move is more reliable, using a time decay function exp (which may be used here)
Is regarded as a random T n Changed weight) exponentially amplifies the tag information being ≥ at the later stage of the shift>
C n Etc. />
Therefore, the credibility score obtained by the credibility scoring function can reflect the credibility of each piece of label information practically, and the RFID label can be identified accurately by taking the credibility score of the RFID label as the basis.
EXAMPLE III
Further, a threshold is preset, if the ith maximum value of the credibility scores of the RFID tags exceeds the threshold (in this embodiment, there are n credibility scores, i = n/2), it indicates that there is strong interference, the credibility of the result obtained in the first embodiment is insufficient, the result is discarded, and the acquisition and recording of tag information are tried again to re-identify the mobile RFID tag closest to the reader at present. And if the reliability score does not exceed the threshold value, confirming the identity of the mobile RFID label closest to the reader at present according to the identification information of the RFID label corresponding to the maximum credibility score.
The present embodiment has the following advantages: and calculating the credibility scores of all the RFID labels which can be read by the reader, and judging whether stronger interference signals exist around the RFID labels according to the credibility scores, so that the occurrence of false detection can be effectively avoided, and the identification accuracy is further improved.
Example four
Further, the reader obtains and records the label information of a plurality of mobile RFID labels in a specified time I times, wherein the label information comprises the identification information of the RFID labels, the read time of the RFID labels, the read times of the RFID labels and the signal intensity value of the RFID labels.
Referring to fig. 3, before the tag information is input to the reliability scoring function, for the tag information having the same identification information, K pieces of tag information having the largest signal intensity values are retained, and other pieces of tag information are deleted, so that I × K pieces of tag information are obtained. The implementation code is as follows:
wherein, S [ i ]][j]Indicating J is more than or equal to 0 and less than I and more than J and more than 0 and less than J of the jth label information recorded when the RFID label is read for the ith time i . I represents that the label information is obtained I times; j. the design is a square i Indicates the total number of tag information (J) obtained at the i-th acquisition i Varying with i, i.e., the total number of tag information obtained at each time may be different).
S max [i][k]And indicating K label information with the maximum signal intensity value read in the ith time, wherein I is more than or equal to 0 and less than I, K is more than or equal to 0 and less than K, and K is the specified maximum number.
Lines 4-5 of the code determine the number of maxima in the ith first message and initialize.
Lines 7-8 and 11-13 of the code filter the first k-1 maxima that have been found.
The code 14-15 proceeds to fetch some maximum value.
The beneficial effect of this embodiment lies in: according to the signal intensity value, the obtained label information is filtered, most of interference signals are screened out, the accuracy of subsequent calculation of the credibility score of the RFID label is facilitated, and the identification accuracy is improved.
EXAMPLE five
Referring to fig. 5, in this embodiment, identification of a carrying object is realized by an RFID tag, a reader is built in a wearable RFID terminal, and a carrier carries the wearable RFID terminal, which includes the following steps:
and each of the plurality of articles to be carried is provided with an RFID label. Article identification is stored in each RFID label, and the RFID labels correspond to the articles one by one; or, the electronic code in each RFID label is associated with the article identification, so that the RFID labels correspond to the articles one by one.
When a carrier (or a sorting robot with a built-in reader) picks up an article to be carried, the wearable RFID terminal starts to acquire and record tag information of an RFID tag on the article, and also acquires and records tag information of other articles to be carried. The tag information includes identification information of the RFID tag (the identification information is an article identifier or an electronic code), a time when the RFID tag is read, a number of times the RFID tag is read, and a signal intensity value of the RFID tag.
The handler places the item on a trailer, on which a finish RFID tag is placed. When the wearable RFID terminal is close to the trailer, the wearable RFID terminal reads the finished RFID tag and stops obtaining tag information.
Inputting the obtained label information into the credibility scoring function:
and calculating the credibility scores of all the mobile RFID labels read by the wearable RFID terminal.
Presetting a threshold (in this embodiment, the threshold is 8.0), and if the maximum value of the reliability score exceeds the threshold, confirming the identity of the currently-carried article according to the identification information of the RFID tag corresponding to the maximum value of the reliability score; otherwise, the label information of a plurality of mobile RFID labels is tried to be obtained and recorded again so as to identify the identity of the currently carried article again.
In the transportation scene, tag information of the RFID tag of an article that has not been transported is substantially a kind of interference signal, and interferes with the identification of the article being transported. The credibility scoring function constructed by the method has excellent effect in the application scene for the following reasons:
different from other application scenes, in the carrying process, the wearable RFID terminal is gradually far away from the articles which are not carried, and the signal intensity value of the read interference tag information is gradually reduced. Obviously, the difference between the signal intensity value of the tag information of the article in transit obtained at the later stage of transit and the interference tag information is more significant than other application scenarios. The function constructed by the invention can fully utilize the rule and further expand the difference by utilizing the time attenuation function exp as described in the second embodiment so as to lead the transportation later stage (namely T) n Smaller) obtained label information has higher credibility score, and the credibility of each piece of label information is reflected more accurately.
EXAMPLE six
An RFID-based item identification device comprising a memory and a processor, the memory storing instructions adapted to be loaded by the processor and to perform the steps of:
the reader acquires and records the tag information of a plurality of mobile RFID tags (refer to FIG. 2) for a plurality of times within a specified time, wherein the tag information comprises identification information of the RFID tags (in the embodiment, the identification information is electronic codes of the RFID tags), the read time of the RFID tags (in the embodiment, the read time is recorded in the form of time stamps), the read times of the RFID tags and the signal intensity value of the RFID tags;
constructing a credibility scoring function based on the label information by using a time attenuation function;
and inputting the tag information into a credibility scoring function to obtain the credibility score of each mobile RFID tag, and confirming the identity of the mobile RFID tag closest to the reader at present according to the identification information of the RFID tag corresponding to the maximum credibility score.
The beneficial effect of this embodiment lies in:
1. the invention can obtain and record label information for many times, and can effectively reduce the influence caused by omitting to identify the RFID label;
2. according to the method, the time attenuation function is utilized to construct the credibility scoring function based on the label information, the factors of reading time, signal intensity value and reading times are comprehensively considered, the obtained credibility scoring can reflect the credibility of each RFID label practically, and therefore accurate identification of the RFID labels is achieved.
EXAMPLE seven
In this embodiment, the confidence score function is constructed as:
wherein m is score Representing the credibility score of a certain RFID label, N representing the total number of label information corresponding to the RFID label, T n A time difference between a read time and an end time in the nth tag information representing the RFID tag,
an absolute value representing an average value of signal strengths among all the tag information of the RFID tag, C n The number of times of reading in the nth tag information of the RFID tag is represented, and a and b are fixed parameters.
The function constructed by the method is an accumulation function, and the credibility score of the RFID label is obtained by accumulating the credibility scores of all label information of the RFID label.
In this function:
1. the closer the reading time of the tag information is to the end shift time (i.e., T) without changing other conditions n Smaller) it canThe reliability score is exponentially increased;
2. the larger the average value of the signal strength of all the valid information of the RFID tag is (since the signal strength value output by the reader is negative, the larger the average value of the signal strength is,
smaller), its confidence score increases exponentially.
3. With other conditions unchanged, the more times an RFID tag is read, the greater its confidence score increases linearly.
In conclusion, the advantages are mainly reflected in that:
referring to fig. 4, the RFID tag to be recognized is moved in a direction generally close to the reader, and tag information of different RFID tags acquired by the reader during the movement of the RFID tag is obtained
C n And N, etc. And the confidence score function can further amplify this difference:
1. exponential amplification of tag information using time decay function exp
A difference in aspect; />
2. The tag information obtained later in the move is more reliable, using a time decay function exp (which may be used here)
Is regarded as a random T n Changed weight) exponentially amplifies the tag information being ≥ at the later stage of the shift>
C n Etc.
Therefore, the credibility score obtained by the credibility scoring function can reflect the credibility of each piece of label information practically, and the RFID label can be identified accurately by taking the credibility score of the RFID label as a basis.
Example eight
Further, a threshold is preset, if the ith maximum value of the credibility scores of the RFID tags exceeds the threshold (in this embodiment, there are n credibility scores, i = n/2), it indicates that there is strong interference, the credibility of the result obtained in the first embodiment is insufficient, the result is discarded, and the acquisition and recording of tag information are tried again to re-identify the mobile RFID tag closest to the reader at present. And if the reliability score does not exceed the threshold value, confirming the identity of the mobile RFID label closest to the reader at present according to the identification information of the RFID label corresponding to the maximum reliability score.
The embodiment has the advantages that: and calculating the credibility scores of all the RFID labels which can be read by the reader, and judging whether stronger interference signals exist around the RFID labels according to the credibility scores, so that the occurrence of false detection can be effectively avoided, and the identification accuracy is further improved.
Example nine
Further, the reader obtains and records the label information of a plurality of mobile RFID labels in a specified time I times, wherein the label information comprises the identification information of the RFID labels, the read time of the RFID labels, the read times of the RFID labels and the signal intensity value of the RFID labels.
Referring to fig. 3, before the tag information is input to the reliability scoring function, for the tag information having the same identification information, K tag information having the largest signal strength values are retained, and other tag information is deleted, so that I × K tag information is obtained. The implementation code is as follows:
wherein, S [ i ]][j]Indicating J is more than or equal to 0 and less than I and more than J and more than 0 and less than J of the jth label information recorded when the RFID label is read for the ith time i . I represents that the label information is obtained I times; j is a unit of i Indicates the total number of tag information (J) obtained at the i-th acquisition i Varying with i, i.e., the total number of tag information obtained at each time may be different).
S max [i][k]And indicating K label information with the maximum signal intensity value read in the ith time, wherein I is more than or equal to 0 and less than I, K is more than or equal to 0 and less than K, and K is the specified maximum number.
Lines 4-5 of the code determine the number of maxima in the ith first message and initialize.
Lines 7-8 and 11-13 of the code filter the first k-1 maxima that have been found.
The code 14-15 proceeds to fetch some maximum value.
The beneficial effect of this embodiment lies in: according to the signal intensity value, the obtained label information is filtered, most of interference signals are screened out, the accuracy of subsequent calculation of the credibility score of the RFID label is facilitated, and the identification accuracy is improved.
Example ten
Referring to fig. 5, in this embodiment, identification of a carrying object is realized by an RFID tag, a reader is built in a wearable RFID terminal, and a carrier carries the wearable RFID terminal, which includes the following steps:
and each of the plurality of articles to be carried is provided with an RFID label. Article identification is stored in each RFID label, and the RFID labels correspond to the articles one by one; or, the electronic code in each RFID label is associated with the article identification, so that the RFID labels correspond to the articles one by one.
When a carrier (or a sorting robot with a built-in reader) picks up an article to be carried, the wearable RFID terminal starts to acquire and record tag information of an RFID tag on the article, and also acquires and records tag information of other articles to be carried. The tag information includes identification information of the RFID tag (the identification information is an article identifier or an electronic code), a time when the RFID tag is read, a number of times the RFID tag is read, and a signal strength value of the RFID tag.
The handler places the item on a trailer, on which a finish RFID tag is placed. When the wearable RFID terminal is close to the trailer, the wearable RFID terminal reads the finished RFID tag and stops obtaining tag information.
Inputting the obtained label information into the credibility scoring function:
and calculating the credibility scores of all the mobile RFID labels read by the wearable RFID terminal.
Presetting a threshold (in this embodiment, the threshold is 8.0), and if the maximum value of the reliability score exceeds the threshold, confirming the identity of the currently-carried article according to the identification information of the RFID tag corresponding to the maximum value of the reliability score; otherwise, the label information of a plurality of mobile RFID labels is tried to be obtained and recorded again so as to identify the identity of the currently carried article again.
In the transportation scene, tag information of the RFID tag of an article that has not been transported is substantially a kind of interference signal, and interferes with the identification of the article being transported. The credibility scoring function constructed by the method has excellent effect in the application scene for the following reasons:
different from other application scenes, in the carrying process, the wearable RFID terminal is gradually far away from the articles which are not carried, and the signal intensity value of the read interference tag information is gradually reduced. Obviously, the difference between the signal intensity value of the tag information of the article in transit obtained at the later stage of transit and the interference tag information is more significant than other application scenarios. The function constructed by the invention can fully utilize the rule and further expand the difference by utilizing the time attenuation function exp as described in the second embodiment so as to lead the transportation later stage (namely T) n Smaller) obtained label information has higher credibility score, and the credibility of each piece of label information is reflected more accurately.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method of identifying a mobile RFID tag, comprising the steps of:
the method comprises the steps that a reader acquires and records label information of a plurality of mobile RFID labels for a plurality of times in appointed time, wherein the label information comprises identification information of the RFID labels, the time for reading the RFID labels, the number of times for reading the RFID labels and signal intensity values of the RFID labels;
constructing a credibility scoring function based on the label information by using a time attenuation function; the reliability scoring function is:
wherein m is score Representing the credibility score of a certain mobile RFID label, N representing the total number of label information corresponding to the RFID label, T n A time difference between a read time and an end read time in nth tag information representing the RFID tag,
absolute value of the mean value of signal intensities in all the tag information, C, representing the RFID tag n Representing the number of times of reading in the nth tag information of the RFID tag, wherein a and b are fixed parameters;
and inputting the tag information into a credibility scoring function to obtain the credibility score of each mobile RFID tag, and confirming the identity of the mobile RFID tag closest to the reader at present according to the identification information of the RFID tag corresponding to the maximum credibility score.
2. The method for identifying the mobile RFID tag of claim 1, further comprising presetting a threshold value, if the ith maximum value of the credibility scores of the plurality of mobile RFID tags exceeds the threshold value, trying to obtain and record tag information again so as to re-identify the mobile RFID tag which is closest to the reader; and otherwise, confirming the identity of the mobile RFID label closest to the reader at present according to the identification information of the RFID label corresponding to the maximum credibility score.
3. The method of claim 2, further comprising, before inputting the tag information into the confidence score function, keeping K tag information having the highest signal strength values for the tag information having the same identification information, and deleting other tag information.
4. The method of claim 1, further comprising setting a termination RFID tag at a location; and stopping obtaining the label information after the reader reads the finished RFID label.
5. The method of claim 1, further comprising placing the mobile RFID tag on an item, the mobile RFID tag moving as the item moves; and the identification information of the mobile RFID tag is article identification information, or the one-to-one correspondence between the identification information and the article identification information is established.
6. An apparatus for identifying a mobile RFID tag, comprising a memory and a processor, the memory storing instructions adapted to be loaded by the processor and to perform the steps of:
the method comprises the steps that tag information of a plurality of mobile RFID tags is obtained and recorded for a plurality of times within appointed time, wherein the tag information comprises identification information of the RFID tags, the read time of the RFID tags, the read times of the RFID tags and the signal intensity value of the RFID tags;
constructing a credibility scoring function based on the label information by using a time decay function; the confidence score function is:
wherein m is score Representing the credibility score of a certain mobile RFID label, N representing the total number of label information corresponding to the RFID label, T n A time difference between a read time and an end time in the nth tag information representing the RFID tag,
an absolute value representing an average value of signal strengths among all the tag information of the RFID tag, C n Representing the number of times of reading in the nth tag information of the RFID tag, wherein a and b are fixed parameters;
and inputting the tag information into a credibility scoring function to obtain the credibility score of each mobile RFID tag, and confirming the identity of the mobile RFID tag closest to the reader at present according to the identification information of the RFID tag corresponding to the maximum credibility score.
7. The device for identifying mobile RFID tags according to claim 6, further comprising presetting a threshold, if the ith maximum value of the credibility scores of the plurality of mobile RFID tags exceeds the threshold, trying to obtain and record tag information again to re-identify the mobile RFID tag which is closest to the reader; and otherwise, confirming the identity of the mobile RFID label closest to the reader at present according to the identification information of the RFID label corresponding to the maximum credibility score.
8. The apparatus of claim 7, further comprising, before inputting the tag information into the credibility scoring function, keeping K pieces of tag information having the largest signal strength values for the tag information having the same identification information, and deleting other tag information.
9. The apparatus of claim 6, further comprising setting a termination RFID tag at a location; and stopping obtaining the label information after the reader reads the finished RFID label.
10. The apparatus according to claim 6, further comprising, disposing the mobile RFID tag on an item, the mobile RFID tag moving as the item moves; the identification information of the mobile RFID tag is article identification information, or a one-to-one correspondence relationship between the identification information and the article identification information is established.
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Application publication date: 20210831 Assignee: Beijing Sibituo Technology Co.,Ltd. Assignor: Fujian Newland Auto-ID Tech. Co.,Ltd. Contract record no.: X2023350000320 Denomination of invention: A method and device for identifying mobile RFID tags Granted publication date: 20230407 License type: Common License Record date: 20230727 |