CN112163437B - Method for determining optimal starting sequence of multiple antennae of RFID - Google Patents
Method for determining optimal starting sequence of multiple antennae of RFID Download PDFInfo
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- CN112163437B CN112163437B CN202010955745.9A CN202010955745A CN112163437B CN 112163437 B CN112163437 B CN 112163437B CN 202010955745 A CN202010955745 A CN 202010955745A CN 112163437 B CN112163437 B CN 112163437B
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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
- G06K7/10316—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 using at least one antenna particularly designed for interrogating the wireless record carriers
- G06K7/10356—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 using at least one antenna particularly designed for interrogating the wireless record carriers using a plurality of antennas, e.g. configurations including means to resolve interference between the plurality of antennas
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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
- G06K7/10019—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 resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers.
- G06K7/10029—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 resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers. the collision being resolved in the time domain, e.g. using binary tree search or RFID responses allocated to a random time slot
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/30—Computing systems specially adapted for manufacturing
Abstract
The invention discloses a method for determining the optimal opening sequence of RFID multi-antenna, firstly determining the average reading rate of each antenna as the initial credible value, numbering and sequencing according to the size of the credible value, starting antenna reading tags in each wheel according to the sequence of the credible value from top to bottom, if the tag set read by a certain antenna and the tag sets read by all the previously stocked antennas contain all the tags, ending the process, calculating the reading success rate of the stocked antennas, and finally, numbering and sequencing each antenna again according to the updated credibility value from large to small, and performing inventory of the next group of tags until all the tags are completely inventory, wherein the sequence of the credibility values from large to small is the optimal antenna opening sequence. The method can quickly complete the reading work, save time and avoid the waste of resources.
Description
Technical Field
The invention relates to the field of RFID technology application in a production environment, in particular to a method for determining an optimal starting sequence of multiple RFID antennas.
Background
Radio Frequency Identification (RFID) technology is widely applied and developed as a core technology of a sensing layer of the Internet of things. Especially, the RFID system operating in the ultra-high frequency operating band has been applied to actual production by many related enterprises in the field of intelligent manufacturing due to its advantages of long recognition distance, high recognition speed, etc. The introduction of the RFID technology can improve the production mode, save the cost, improve the efficiency and carry out quality control and supervision on the production process.
However, in the actual production process, the product or semi-finished product with RFID may be missed and have a low reading rate in the reading process due to the influence of the factors such as position change, speed change, external interference, etc. in the production line or transportation process, and often a plurality of antennas need to be installed at one position, and one antenna is randomly turned on after the reading task starts, and the reading and writing are performed according to a certain sequence, so as to improve the reading rate.
In order to solve the problem of low tag reading rate in an actual production line, the current solution is to concentrate the reader/writer antenna to a certain station, and the antenna layout is as shown in fig. 1. Randomly selecting one of the antennas as the first antenna to be turned on, where A is selected 1 The antenna acts as the first switched-on antenna. Next, select A 1 The antenna of the opposite side of the antenna being the second antenna to be switched on, i.e. switch-on A 2 An antenna. Then sequentially opening A 3 And A 4 An antenna. And (3) setting the initial weight of each antenna to be 0, and adding 1 to the weight of the antenna with the largest number of read tags after each round of tag reading is completed. And when the system works next time, the antenna opening sequence is determined again according to the last weight ranking.
Although the mode solves the problem of interference caused by simultaneous radiation of the reader antenna, the reading rate of the system is also improved. However, in this scheme, the first antenna is randomly selected to be turned on, and performance tests are not performed on each antenna according to the field production environment, so that the influence of environmental factors is ignored. In addition, the difference of antenna reading and the performance of each antenna are not considered in the scheme, and the weight increase amplitude is fixed and unchanged, so that the ratio of the weight cumulative value of each antenna to the reading frequency cumulative value is fixed and unchanged, the weight increase is too fast, and the reliability of the finally obtained antenna weight ranking and the antenna opening sequence is greatly reduced.
Disclosure of Invention
The invention aims to provide a method for determining the optimal opening sequence of multiple RFID antennae aiming at the defects of the prior art.
The purpose of the invention is realized by the following technical scheme: a method for determining the optimal opening sequence of RFID multi-antenna comprises the following steps:
the first step is as follows: and detecting the performance condition of each position antenna under a production environment, and determining the reading performance of each antenna. Obtaining the average reading rate of each position antenna; and selecting n groups of tags for inventory, and recording the number of each group of tags as x.
The second step: and numbering and sequencing the antennas according to the obtained average reading rate of each antenna from large to small, and setting the average reading rate of each antenna as an initial credible value of the antenna with the corresponding sequence number. The credible values of m antennas of the jth group of tags are recorded as a 1j 、a 2j 、a 3j 、…、a mj Then each initial confidence value is recorded as a 10 、a 20 、a 30 、…、a m0 。
The third step: starting the antenna reading tags according to the sequence of the credible value from top to bottom in each wheel disc, and recording the number of the tags read by the k antenna as
The tag set is marked as U k (k ═ 1,2, 3.., m); if the union set of the tag set read by a certain antenna and the tag sets read by all the previously stored antennas covers all the tags, the process is ended, and the fourth step is carried out;
the fourth step: calculating the reading success rate of the antenna for inventory, wherein the formula is as follows:
in the formula, λ k And weighting the credible value of the antenna with the highest identification and reading success rate for the identification success rate of the kth antenna, wherein the weighting amplitude is determined based on the credible value of the antenna at the last time, and the formula is as follows:
a i(j+1) ＝a ij +μ×a ij
wherein, a i(j+1) For the latest confidence value of the antenna, a ij The last credible value of the antenna is obtained; μ is the trusted step size:
wherein, i is 1,2,3, and, m, j is 1,2, 3.
The fifth step: and numbering and sequencing each antenna again according to the credible value of the antenna updated in the fourth step from big to small, returning to the third step until all the n groups of tags are completely stocked, and opening the antennas according to the credible value from big to small to be the optimal antenna opening sequence.
Further, the specific process of determining the reading performance of each antenna is as follows: the same group of tags is used as an experimental group, the number of the tags is p, and each reader-writer antenna is provided withPerforming recognition no less than q times. The antenna serial numbers of m positions are respectively marked as A 1 、A 2 、…、A 3 、A m And the average reading rate of the antenna at each position obtained by not less than q times of experiments is respectively recorded as eta 1 、η 2 、η 3 、…、η m . The value of q is selected according to the precision required in industry, and the larger the q is, the more accurate the measured result is.
Further, the third specific process is that each wheel stores the antenna reading label with the highest credible value firstly, if the number of the labels recognized after the first antenna is stored is equal to x, namely the third specific process is that
Ending the process and entering the fourth step; if it is not
The next antenna is continuously turned on in the order that the confidence values are sequentially reduced. After the second antenna inventory is finished, the identified label set U is collected 2 And the first antenna identified tag set U 1 Making a comparison if U 1 And U 2 After subtracting the commonly identified tags, the number of the remaining tags is equal to x, that is:
(U 1 ∪U 2 ) num ＝x
and ending the process, entering the fourth step, and otherwise, starting the next antenna.
Further, if the last antenna cannot be completely read after the inventory is finished, the last antenna starts to read again from the first antenna.
The invention has the beneficial effects that: the object of the invention is a method for determining an optimal turn-on sequence for an RFID antenna. In an actual antenna opening sequence optimization scheme, the method can determine the weight ranking of the antennas more accurately, and then determine the optimal opening sequence of the RFID antennas according to the ranking, so that the system is helped to complete the reading work quickly, the time is saved, and the waste of resources is avoided.
Drawings
FIG. 1 is a schematic diagram of an antenna layout of a reader/writer according to an embodiment of the present invention;
FIG. 2 is a flowchart of a method for determining an optimal turn-on sequence for RFID multiple antennas according to an embodiment of the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
The invention provides a method for determining an optimal starting sequence of multiple RFID antennas, which comprises the following specific steps:
the first step is as follows: and detecting the performance condition of each position antenna under a production environment, and determining the reading performance of each antenna. Obtaining the average reading rate of each position antenna; and selecting n groups of tags for inventory, and recording the number of each group of tags as x. The specific process of determining the reading performance of each antenna is as follows: the same group of tags is used as an experimental group, the number of the tags is p, and at least q times of identification and reading are carried out on each reader-writer antenna. The antenna serial numbers of m positions are respectively marked as A 1 、A 2 、…、A 3 、A m And the average reading rate of the antenna at each position obtained by not less than q times of experiments is respectively recorded as eta 1 、η 2 、η 3 、…、η m . The value of q is selected according to the precision required in industry, and the larger q is, the more accurate the measured result is.
The second step is that: and numbering and sequencing the antennas according to the obtained average reading rate of each antenna from large to small, and setting the average reading rate of each antenna as an initial credible value of the antenna with the corresponding sequence number. The credible values of m antennas of the jth group of tags are recorded as a 1j 、a 2j 、a 3j 、…、a mj Then each initial confidence value is recorded as a 10 、a 20 、a 30 、…、a m0 。
The third step: starting the antenna reading tags according to the sequence of the credible value from top to bottom in each wheel disc, and recording the number of the tags read by the k antenna as
The tag set is marked as U k (k ═ 1,2,3,. ·, m); if the union set of the tag set read by a certain antenna and the tag sets read by all the previously stored antennas covers all the tags, the process is ended, and the fourth step is carried out; the specific process is as follows, firstly opening the antenna identification tag with the highest credibility value in each wheel disc, and if the number of the tags identified after the first antenna disc is stored is equal to x, namely
Ending the process and entering the fourth step; if it is used
The next antenna is continuously turned on in the order that the confidence values are sequentially reduced. After the second antenna inventory is finished, the identified label set U is collected 2 And the first antenna identified tag set U 1 Making a comparison if U 1 And U 2 After subtracting the commonly identified tags, the number of the remaining tags is equal to x, that is:
(U 1 ∪U 2 ) num ＝x
and ending the process, entering the fourth step, and otherwise, starting the next antenna. And if the last antenna cannot be completely read after the inventory completion, the last antenna starts to read again from the first antenna.
The fourth step: calculating the reading success rate of the antenna for inventory, wherein the formula is as follows:
in the formula, λ k And carrying out credible value weighting on the antenna with the highest identification and reading success rate for the kth antenna and then for each wheel disc, wherein the weighting amplitude is determined based on the last credible value of the antenna, and the formula is as follows:
a i(j+1) ＝a ij +μ×a ij
wherein, a i(j+1) For the latest confidence value of the antenna, a ij Is on the antennaA primary confidence value; μ is the trusted step size:
wherein, i is 1,2,3, and, m, j is 1,2, 3.
The fifth step: and according to the updated credible values of the antennas in the fourth step, numbering and sequencing each antenna again from large to small according to the credible values, and then returning to the third step until all the n groups of tags are completely stocked, wherein the sequence of starting the antennas from large to small according to the credible values is the optimal antenna starting sequence.
One embodiment of the present invention is shown in fig. 1, which is a layout pattern of the antenna of the reader/writer according to the present invention. The 4 reader-writer antennas are positioned inside the channel machine, are parallel to the tags to be read and are respectively positioned at the upper left corner, the lower left corner, the upper right corner and the lower right corner of the channel machine.
In order to determine the optimal antenna turn-on sequence of the system, the method of the present invention needs to be completed by the following 6 steps, and the complete flow chart is shown in fig. 2:
the first step is as follows: the performance conditions of the 4 position antennas are detected under the production environment, and the reading performance of each antenna is determined. The same group of tags is adopted as an experimental group, the number of the tags is 100, and each reader-writer antenna is identified and read for at least 1000 times. Let the 4 antennas be A 1 、A 2 、A 3 、A 4 And the average reading rates obtained by at least 1000 times of experiments are respectively recorded as eta 1 、η 2 、η 3 、η 4 . And selecting n groups of tags for inventory, and recording the number of each group of tags as x.
The second step is that: and setting a preliminary credible value according to the obtained average reading rate of the 4 antennas. Let us assume a reading rate of 4 antennas of η 1 ＞η 2 ＞η 3 ＞η 4 Let the 4-antenna confidence value be a 1j 、a 2j 、a 3j 、a 4j Wherein j is 1,2, 3. Let the initial confidence value be a 10 ＝η 1 、a 20 ＝η 2 、a 30 ＝η 3 、a 40 ＝η 4 。
The third step: starting the antenna with the highest credible value in advance in each wheel disc, and recording the number of read tags
The tag set is marked as U k (k is 1,2,3, 4). If the number of the identified labels after the first antenna inventory is finished is equal to x, namely
The process is finished; if it is used
The next antenna continues to be turned on. After the second antenna inventory is finished, the identified label set U is collected 2 And the first antenna identified tag set U 1 Making a comparison if U 1 And U 2 After subtracting the commonly identified tags, the number of the remaining tags is equal to x, that is:
(U 1 ∪U 2 ) num ＝x
the process is finished, otherwise, the next antenna is started. If the fourth antenna can not be read completely after the inventory is finished (the possibility of the situation is very small), the fourth antenna starts to read again from the first antenna.
The fourth step: calculating the reading success rate of the antenna for inventory, wherein the formula is as follows:
in the formula, λ k And weighting the credible value of the antenna with the highest identification and reading success rate for the identification success rate of the kth antenna, wherein the weighting amplitude is determined based on the credible value of the antenna at the last time, and the formula is as follows:
a i(j+1) ＝a ij +μ×a ij
wherein i is 1,2,3,4，j＝1,2,3,...,n，a i(j+1) For the latest confidence value of the antenna, a ij Is the last trusted value for that antenna. μ is the trusted step size:
wherein i is 1,2,3,4, j is 1,2, 3.
The fifth step: and according to the updated credible values of the antennas in the fourth step, numbering and sequencing each antenna again from large to small according to the credible values, and then returning to the third step until all the n groups of tags are completely stocked, wherein the sequence of starting the antennas from large to small according to the credible values is the optimal antenna starting sequence.
By arranging the 4 antennas in fig. 1 of the present invention, when the number of the inventory tag groups reaches more than 100, a stable confidence value sequence can be output basically. The reading success rate of the optimal opening sequence of the RFID antenna determined by the method can reach more than 98 percent.
The above-described embodiments are intended to illustrate rather than to limit the invention, and any modifications and variations of the present invention are within the spirit of the invention and the scope of the appended claims.
Claims (2)
1. A method for determining the optimal starting sequence of multiple RFID antennas is characterized by comprising the following specific steps:
the first step is as follows: detecting the performance condition of each position antenna in a production environment, and determining the reading performance of each antenna; obtaining the average reading rate of each position antenna; selecting n groups of tags for inventory, and recording the number of each group of tags as x;
the second step is that: numbering and sequencing the antennas according to the obtained average reading rate of each antenna from large to small, and setting the average reading rate of each antenna as an initial credible value of the antenna with the corresponding serial number; the credible values of m antennas of the jth group of tags are recorded as a 1j 、a 2j 、a 3j 、…、a mj Then each initial confidence value is recorded asa 10 、a 20 、a 30 、…、a m0 ；
The third step: starting the antenna reading tags according to the sequence of the credible values from high to low in each wheel disc, and recording the number of the tags read by the k antenna as
The tag set is marked as U k (k ═ 1,2,3,. ·, m); if the union set of the tag set read by a certain antenna and the tag sets read by all the previously stocked antennas covers all the tags, the process is ended, and the fourth step is carried out;
the third step is that each wheel disk firstly starts the antenna reading label with the highest credible value, if the number of the labels recognized after the first antenna disk storage is finished is equal to x, namely the third step is that
Ending the process and entering the fourth step; if it is not
Continuing to start the next antenna according to the sequence that the credible values are sequentially reduced; after the second antenna inventory is finished, the identified label set U is collected 2 And the first antenna identified tag set U 1 Making a comparison if U 1 And U 2 After subtracting the commonly identified tags, the number of the remaining tags is equal to x, that is:
(U 1 ∪U 2 ) num ＝x
ending the process, entering the fourth step, and otherwise, starting the next antenna;
if the last antenna can not be completely read after the inventory is finished, reading again from the first antenna;
the fourth step: calculating the reading success rate of the antenna for inventory, wherein the formula is as follows:
in the formula of lambda k And weighting the credible value of the antenna with the highest identification and reading success rate for the identification success rate of the kth antenna, wherein the weighting amplitude is determined based on the credible value of the antenna at the last time, and the formula is as follows:
a i(j+1) ＝a ij +μ×a ij
wherein, a i(j+1) For the latest confidence value of the antenna, a ij The last credible value of the antenna is obtained; μ is the trusted step size:
wherein, i is 1,2,3,., m, j is 1,2, 3., n;
the fifth step: and numbering and sequencing each antenna again according to the credible value of the antenna updated in the fourth step from big to small, returning to the third step until all the n groups of tags are completely stocked, and opening the antennas according to the credible value from big to small to be the optimal antenna opening sequence.
2. The method for determining the optimal turn-on sequence of the RFID multi-antenna as claimed in claim 1, wherein the specific process for determining the reading performance of each antenna comprises: the same group of tags is used as an experimental group, the number of the tags is p, and at least q times of identification and reading are carried out on each reader-writer antenna; the antenna serial numbers of m positions are respectively marked as A 1 、A 2 、…、A 3 、A m And the average reading rate of the antenna at each position obtained by not less than q times of experiments is respectively recorded as eta 1 、η 2 、η 3 、…、η m (ii) a The value of q is selected according to the precision required in industry, and the larger the q is, the more accurate the measured result is.
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