CN103235963B - A kind of distribution of the RFID label tag based on matrix analysis preferred disposition method - Google Patents

A kind of distribution of the RFID label tag based on matrix analysis preferred disposition method Download PDF

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CN103235963B
CN103235963B CN201310175258.0A CN201310175258A CN103235963B CN 103235963 B CN103235963 B CN 103235963B CN 201310175258 A CN201310175258 A CN 201310175258A CN 103235963 B CN103235963 B CN 103235963B
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label tag
rfid label
distribution
rfid
matrix
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CN103235963A (en
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于银山
俞晓磊
赵志敏
汪东华
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JIANGSU INSTITUTE OF STANDARDIZATION
Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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Abstract

The read rate of rfid system depends on RFID label tag collision, reads the impact of the many factors such as distance, comprises the impact of RFID label tag position for read rate.And the main advantage of RFID technique is that multiple goal identifies simultaneously, if reduced due to rfid interrogator read-write efficiency, produce skip or the phenomenon such as to misread, so RFID identifies that advantage will no longer exist.Therefore, optimize RFID label tag distributing position, thus improve RFID label tag read rate, the development for RFID technique is most important.A kind of distribution of the RFID label tag based on matrix analysis preferred disposition method, by the RFID label tag matrix procession formula, the poor read rate calculating equal matrix analytical procedure and acquisition of elemental standards that obtain rfid interrogator, thus carry out preferably to RFID label tag position, find the label putting position of recognition best performance, and then reducing actual working environment to the impact of read rate from RFID label tag distribution preferred disposition angle, this invention has important Theory and applications and is worth.

Description

A kind of distribution of the RFID label tag based on matrix analysis preferred disposition method
Technical field
The present invention relates to RFID technique and Internet of Things application, be specifically related to RFID many label distributions field of configuration, particularly introduce Matrix Analysis Method and preferred disposition is carried out to RFID label tag distribution, belong to detection technique field.
Background technology
Radio-frequency (RF) identification (Radio Frequency Identification, RFID) as a kind of non-contact automatic identification technology of novelty, obtain widespread use in various fields such as modern logistics, intelligent transportation, the production automations, in the wisdom logistics of people's close attention, the discrepancy library information collection of goods is applied particularly outstanding with goods checking especially.But due to the fast development of Internet of Things and RFID technique, industry inside lacks unified standard, and Internet of Things application system actual performance lacks effective assessment mode and detection means.
The read rate of rfid system depends on RFID label tag collision, reads the impact of the many factors such as distance, comprises the impact of RFID label tag position for read rate, makes the read rate of rfid interrogator not high.And the main advantage of RFID technique is that multiple goal identifies simultaneously, if reduced due to rfid interrogator read-write efficiency, produce skip or the phenomenon such as to misread, so RFID identifies that advantage will no longer exist.Therefore, optimize RFID label tag distributing position, thus improve RFID label tag read rate, the development for RFID technique is most important.
RFID label tag is collided, and namely during multiple RFID label tag correspondence rfid interrogator, RFID label tag sends data simultaneously, mutually collides between signal, makes rfid interrogator cannot correctly obtain all FRID label information.At present, have a lot of algorithm to solve RFID label tag collision problem both at home and abroad, obtain remarkable effect, but the impact of RFID label tag distributing position on rfid system read rate need further research.
Summary of the invention
The present invention proposes a kind of RFID label tag based on matrix analysis distribution preferred disposition method, comprises the following steps:
First step: build test platform step, test platform architecture as shown in Figure 1, measure antenna by 1-, 2-RFID read write line, 3-computer for controlling, 4-motor, 5-guide rail, 6-pallet, 7-RFID label form, 6-pallet and 1-measure antenna and lay respectively at 5-guide rail two ends, 1-measures antenna and is connected with 2-RFID read write line, 6-pallet is placed the test sample posting 7-RFID label;
Second step: RFID label tag signal strength measurement step, pallet on guide rail by driven by motor to measurement antenna movement, along with pallet is near measuring antenna, when the distance of test antenna and pallet is R, measure the signal intensity of each RFID label tag of antenna measurement, measure RFID label tag read rate simultaneously, be stored in computer for controlling;
Third step: matrix analysis step, the RFID label tag signal intensity above second step measurement obtained, as matrix element composition RFID label tag distribution matrix, calculates the determinant of RFID label tag distribution matrix standard deviation and RFID label tag distribution matrix;
4th step: RFID label tag signal strength distribution map plot step, by RFID label tag position as horizontal ordinate, RFID label tag signal intensity, as ordinate, draws out RFID label tag signal strength distribution map;
5th step: RFID label tag distribution preferred disposition determining step, the test sample posting RFID label tag is put again according to different distributions, repeat above second, three, four steps, after H measurements and calculations, the determinant of the RFID label tag distribution matrix that the RFID label tag read rate obtained according to above second step and third step obtain and RFID label tag distribution matrix standard deviation, find out and there is minimum RFID label tag distribution matrix standard deviation, the RFID label tag distribution of minimum RFID label tag distribution matrix determinant and maximum RFID label tag read rate, as optimum RFID label tag distribution allocation plan.
A kind of above-described distribution of the RFID label tag based on matrix analysis preferred disposition method, is characterized in that, RFID label tag read rate described in second step n is the RFID label tag number that rfid interrogator reads, and N is RFID label tag sum.
A kind of above-described distribution of the RFID label tag based on matrix analysis preferred disposition method, it is characterized in that, RFID label tag distribution matrix described in third step, its element is each RFID label tag signal intensity measuring antenna acquisition:
wherein D (i, j) is the RFID label tag signal intensity of the capable j row of i, and r is total line number of RFID label tag arrangement, and s is total columns of RFID label tag arrangement.
A kind of above-described distribution of the RFID label tag based on matrix analysis preferred disposition method, is characterized in that, RFID label tag distribution matrix standard deviation described in third step: m is the element number of RFID label tag distribution matrix D, for the average of D, namely r is the line number of D, and s is the columns of D.
A kind of above-described distribution of the RFID label tag based on matrix analysis preferred disposition method, is characterized in that, the determinant of RFID label tag distribution matrix described in third step:
a (i, j) is the algebraic complement of D (i, j).
A kind of above-described distribution of the RFID label tag based on matrix analysis preferred disposition method, it is characterized in that, described in the 4th step, RFID label tag signal strength distribution map is basis calculating and plotting, wherein, P backfor RFID label tag signal intensity, σ is the radar scattering face area measuring antenna, P readerfor rfid interrogator emissive power, G readerfor the antenna gain of RFID label tag, R is that RFID label tag arrives the distance measuring antenna, using RFID label tag position as horizontal ordinate, using RFID label tag signal intensity as ordinate, can draw RFID label tag signal strength distribution map.
Accompanying drawing explanation
Fig. 1: test platform architecture figure
Fig. 2: RFID label tag signal strength distribution map
Embodiment
Based on a RFID label tag distribution preferred disposition method for matrix analysis, comprise the following steps:
First step: build test platform step, test platform architecture as shown in Figure 1, antenna is measured by 1-, 2-RFID read write line, 3-computer for controlling, 4-motor, 5-guide rail, 6-pallet, 7-RFID label is formed, 6-pallet and 1-measure antenna and lay respectively at 5-guide rail two ends, 1-measures antenna and is connected with 2-RFID read write line, 6-pallet is placed the test sample posting 7-RFID label, RFID label tag adopts UHF ultrahigh frequency electronic tag---RRU1861:8dBi antenna, reading/writing distance 3-5m, read write line adopts YW602-8 read write line: built-in 12dBi antenna, maximum RF output power is 30dBm,
Second step: RFID label tag signal strength measurement step, pallet on guide rail by driven by motor to measurement antenna movement, along with pallet is near measuring antenna, when the distance of test antenna and pallet is 4.5m, measure the signal intensity of each RFID label tag of antenna measurement, measure RFID label tag read rate simultaneously, be stored in computer for controlling;
Third step: matrix analysis step, the RFID label tag signal intensity above second step measurement obtained, as matrix element composition RFID label tag distribution matrix, calculates the determinant of RFID label tag distribution matrix standard deviation and RFID label tag distribution matrix;
4th step: RFID label tag signal strength distribution map plot step, by RFID label tag position as horizontal ordinate, RFID label tag signal intensity, as ordinate, draws out RFID label tag signal strength distribution map;
5th step: RFID label tag distribution preferred disposition determining step, the test sample posting RFID label tag is put again according to different distributions, repeat above second and third, four steps, after 3 measurements and calculations, the determinant of the RFID label tag distribution matrix that the RFID label tag read rate obtained according to above second step and third step obtain and RFID label tag distribution matrix standard deviation, by comparing, obtain minimum RFID label tag distribution matrix standard deviation S d=80.6, minimum RFID label tag distribution matrix determinant absolute value | D 1|=1.94 × 10 5and the RFID label tag distribution of maximum RFID label tag read rate γ=1, using this as optimum RFID label tag distribution allocation plan.
A kind of above-described distribution of the RFID label tag based on matrix analysis preferred disposition method, is characterized in that, RFID label tag read rate described in second step γ 1 = n 1 N = 16 16 = 1 , γ 2 = n 2 N = 14 16 = 0.875 , γ 3 = n 3 N = 14 16 = 0.875 , Wherein, the RFID label tag number that rfid interrogator reads for three times is respectively n 1=16, n 2=14, n 3=14, RFID label tag sum N=16.
A kind of above-described distribution of the RFID label tag based on matrix analysis preferred disposition method, it is characterized in that, RFID label tag distribution matrix described in third step, its element is each RFID label tag signal intensity measuring antenna acquisition:
D = 297.3 304.8 293.4 282.4 312.5 316.2 306.3 294 310.3 304.1 303.5 299.6 293.4 304.6 303.6 285.6 , 4 × 4 matrixes.
A kind of above-described distribution of the RFID label tag based on matrix analysis preferred disposition method, it is characterized in that, described in third step, RFID label tag distribution matrix standard deviation calculation procedure is as follows:
First D is tried to achieve kaverage: D ‾ = Σ i = 1 , j = 1 i = r , j = s D ( i , j ) r × s = 300.73 ,
Then RFID label tag distribution matrix standard deviation S D = Σ i = 1 , j = 1 i = r , j = s ( D ( i , j ) - D ‾ ) 2 M - 1 = 86.0 .
A kind of above-described distribution of the RFID label tag based on matrix analysis preferred disposition method, it is characterized in that, described in third step, RFID label tag distribution matrix calculation procedure is as follows:
Its determinant | D | = Σ i = 1 , j = 1 i = r , j = s D ( i , j ) A ( i , j ) = 1.94 × 10 5
If measure the number of times H=3 of RFID label tag signal intensity, obtain matrix respectively D = 297.3 304.8 293.4 282.4 312.5 316.2 306.3 294 310.3 304.1 303.5 299.6 293.4 304.6 303.6 285.6 , D 1 = 0 304.8 293 0 312.5 316.2 306.3 294 310.3 304.1 303.5 299.6 293.4 304.6 303.6 285.6 , D 2 = 297.3 304.8 293.4 282.4 312.5 0 306.3 294 310.3 304.1 0 299.6 293.4 304.6 303.6 285.6 , Calculate standard deviation S successively d1=86.0, S d2=1.07 × 10 4, S d3=1.05 × 10 4, its determinant | D 1|=1.94 × 10 5, | D 2|=-1.78 × 10 6, | D 3|=2.07 × 10 8.
A kind of above-described distribution of the RFID label tag based on matrix analysis preferred disposition method, it is characterized in that, described in the 4th step, RFID label tag signal strength distribution map is basis calculating and plotting, wherein, P backfor RFID label tag signal intensity, σ is the radar scattering face area measuring antenna, P readerfor rfid interrogator emissive power, G readerfor the antenna gain of RFID label tag, R is that RFID label tag arrives the distance measuring antenna, using RFID label tag position as horizontal ordinate, using RFID label tag signal intensity as ordinate, can draw RFID label tag signal strength distribution map, as shown in Figure 2.

Claims (6)

1., based on a RFID label tag distribution preferred disposition method for matrix analysis, comprise the following steps:
First step: build test platform step, test platform by measuring antenna, rfid interrogator, computer for controlling, motor, guide rail, pallet form, pallet and measurement antenna lay respectively at guide rail two ends, measure antenna to be connected with rfid interrogator, pallet is placed the test sample posting RFID label tag;
Second step: RFID label tag signal strength measurement step, pallet on guide rail by driven by motor to measurement antenna movement, along with pallet is near measuring antenna, when the distance of test antenna and pallet is R, measure the signal intensity of each RFID label tag of antenna measurement, measure RFID label tag read rate simultaneously, be stored in computer for controlling;
Third step: matrix analysis step, the RFID label tag signal intensity above second step measurement obtained, as matrix element composition RFID label tag distribution matrix, calculates the determinant of RFID label tag distribution matrix standard deviation and RFID label tag distribution matrix;
4th step: RFID label tag signal strength distribution map plot step, by RFID label tag position as horizontal ordinate, RFID label tag signal intensity, as ordinate, draws out RFID label tag signal strength distribution map;
5th step: RFID label tag distribution preferred disposition determining step, the test sample posting RFID label tag is put again according to different distributions, repeat above second, three, four steps, after H measurements and calculations, the determinant of the RFID label tag distribution matrix that the RFID label tag read rate obtained according to above second step and third step obtain and RFID label tag distribution matrix standard deviation, find out and there is minimum RFID label tag distribution matrix standard deviation, the RFID label tag distribution of minimum RFID label tag distribution matrix determinant and maximum RFID label tag read rate, as optimum RFID label tag distribution allocation plan.
2. a kind of distribution of the RFID label tag based on matrix analysis preferred disposition method according to claim 1, is characterized in that, RFID label tag read rate described in second step n is the RFID label tag number that rfid interrogator reads, and N is RFID label tag sum.
3. a kind of distribution of the RFID label tag based on matrix analysis preferred disposition method according to claim 1, it is characterized in that, RFID label tag distribution matrix described in third step, its element is each RFID label tag signal intensity measuring antenna acquisition:
wherein D (i, j) is the RFID label tag signal intensity of the capable j row of i, and r is total line number of RFID label tag arrangement, and s is total columns of RFID label tag arrangement.
4. a kind of distribution of the RFID label tag based on matrix analysis preferred disposition method according to claim 1, is characterized in that, RFID label tag distribution matrix standard deviation described in third step:
m is the element number of RFID label tag distribution matrix D, for the average of D, namely r is the line number of D, and s is the columns of D.
5. a kind of distribution of the RFID label tag based on matrix analysis preferred disposition method according to claim 1, is characterized in that, RFID label tag distribution matrix determinant described in third step:
a (i, j) is the algebraic complement of D (i, j).
6. a kind of distribution of the RFID label tag based on matrix analysis preferred disposition method according to claim 1, it is characterized in that, described in the 4th step, RFID label tag signal strength distribution map is basis calculating and plotting, wherein, P backfor RFID label tag signal intensity, σ is the radar scattering face area measuring antenna, P readerfor rfid interrogator emissive power, G readerfor the antenna gain of RFID label tag, R is that RFID label tag arrives the distance measuring antenna, using RFID label tag position as horizontal ordinate, using RFID label tag signal intensity as ordinate, can draw RFID label tag signal strength distribution map.
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CN106778951B (en) * 2016-11-23 2019-08-13 江苏省质量和标准化研究院 A kind of RFID multi-tag three-dimensional Optimal Distribution detection method based on Flood-Fill and SVM

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