CN105701430B - A kind of method for preventing from misreading mobile object reading area external information - Google Patents
A kind of method for preventing from misreading mobile object reading area external information Download PDFInfo
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- CN105701430B CN105701430B CN201410705627.7A CN201410705627A CN105701430B CN 105701430 B CN105701430 B CN 105701430B CN 201410705627 A CN201410705627 A CN 201410705627A CN 105701430 B CN105701430 B CN 105701430B
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Abstract
The present invention relates to a kind of method for preventing from misreading mobile object reading area external information, system carries out Initialize installation, on the key node for needing to carry out information gathering or information checking, pass through the lag time of the RFID reader RFID information related to antenna acquisition and the RFID information of measurement instrument；The RFID information collected is stored to application server, judges label information type, filter out the RFID information of measurement instrument carried out with the FRID label information of its support container it is corresponding；By RFID located in connection algorithms, threshold value is calculated；Judge the relation between the RFID lag time of measurement instrument and threshold value, the RFID information of measurement instrument is handled, obtains correct label information.The present invention realizes and RFID read ranges is controlled that effectively avoid distinguishing online misreads problem；The reading accuracy in RFID batch reading process is improved, reduces the occupation rate in system development costs and space.
Description
Technical field
The present invention relates to the use of RFID technique batch read mobile object electronic labeling information field, specifically one
Kind prevents the method for misreading mobile object reading area external information.
Background technology
At present at home, super high frequency radio frequency identifies RFID technique because with passive, small volume, remote identification, high speed
Mobile object identification, multi-targets recognition and the features such as contactless identification, be widely used in logistics, manufacture, communications and transportation, medical treatment,
The fields such as false proof and asset management.
In electric-power metering industry, the measurement instrument as management assets (including single-phase electric energy meter, three-phase electric energy meter, is adopted
Storage, terminal, transformer etc.), each assets is attached with only one ultrahigh frequency RFID electronic tag, marking articles or
Logistics transportation information.When the multiple mobile electron label datas of batch capture are needed during the whole logistics delivery of assets, often
Run into that identification range is uncontrollable, electronic tag is misread, intensive tag recognition rate is low and the problems such as blind spot label None- identified.
To ensure the accuracy of batch identification electronic labeling information, prevent the diffraction of extraneous label from disturbing, adopt extensively at present
Method is to configure metal box on logistics delivery line, is distinguished in casing, utilizes metallic shield.When RFID system is applied
When in metal environment, metal has shielding action to electromagnetic field.Because electromagnetic field can cause the movement of metal inside free charge, from
And off-energy.The depth that electromagnetism wave energy reaches metal inside is represented with skin depth：Assuming that metal is
Iron (K=1.06 × 106S/m, μ=300), under 868MHz frequencies, skin depth is 2.2 μm, so in general, electricity
Magnetic wave can not be propagated directly through metal, there is a region that can not be read at metal rear.
But use metallic shield there is also drawback, according to there are problems that from the point of view of current application it is following some：1st, use
Metallic shield method can produce cavity effect and multipath effect aggravation blind spot phenomenon, reduce discrimination.The electricity that read write line is sent
Magnetic wave can form a kind of special field distribution for being called cavity effect in the metal environment of closing.In theory, cavity effect is not
Good reaction, it should avoid.But it can not often be avoided in practical application, its final distribution situation is more complicated and can not calculate
With estimate.Substantial amounts of metal mirror easily causes Signal averaging and produces signal blind spot, i.e. multipath effect.2nd, using metal
During the method for case shielding, the sealing problem of metal box is also a very scabrous problem, as long as casing has gap, Jiu Huicun
In electromagnetism leaked wave phenomenon.Produced when the electronic tag of object outside metal box is just in the effective working region for the electromagnetic wave that leaks
Raw induced-current, so as to obtain energy, electronic tag is activated so that itself coding information is passed through built-in radio frequency by electronic tag
Antenna is sent；The reception antenna of reader can equally receive the modulated signal sent from external electronic tags, obtain
Problem is misread in the information of external disturbance label, generation.
So it is difficult to solve ultrahigh frequency electronic tag intensity read mode in practical application using the method for metallic shield
Under misread problem.
The content of the invention
In view of the shortcomings of the prior art, the present invention, which provides one kind, can either realize that ultrahigh frequency RFID system batch reads movement
RFID, again using RFID system ranging technology specification read range, prevent from misreading certain area exoelectron
The method of label information.
The used to achieve the above object technical scheme of the present invention is：One kind prevents from misreading mobile object reading area
The method of external information, comprises the following steps：
Step 1：System carries out Initialize installation, on the key node for needing to carry out information gathering or information checking,
Pass through the RFID reader RFID information related to antenna acquisition and the RFID information of measurement instrument
Lag time；
Step 2：The RFID information collected is stored to application server, judges label information type, is sieved
Select the RFID information of measurement instrument carried out with the FRID label information of its support container it is corresponding；
Step 3：By RFID located in connection algorithms, threshold value is calculated；
Step 4：The relation between the RFID lag time of measurement instrument and threshold value is judged, to measurement instrument
RFID information is handled, and obtains correct label information.
The RFID located in connection algorithm is：
Step 1：By the vertical range of the RFID of RFID antenna known to system to measurement instrument, according to similar
The proportionate relationship of triangle, draw the radius value of the effective read range of plane；
Step 2：Radius value and Atria frontier juncture system as obtained by calculating, draw RFID antenna to RFID
Effective reading distance L；
Step 3：By formula T=2*L/c, it is propagation velocity of electromagnetic wave to draw threshold value T, wherein c.
Relation between the RFID lag time for judging measurement instrument and threshold value includes procedure below：
If the lag time of the RFID information of measurement instrument is not more than threshold value, by the RFID
Information is stored to data server, is otherwise stored the RFID information to exception database, and abnormal data is entered
Row analysis.
The invention has the advantages that and advantage：
1. realized using RFID technique the metering appliance information of the online conveying of power industry is carried out in real time, the letter of batch
Breath collection；The real time data collected in course of conveying is received, stored, analyzed, and then is realized to logistics goods
Real-time online management；
2. realization is controlled to RFID read ranges, effectively avoid distinguishing online misreads problem；
3. improve the reading accuracy in RFID batch reading process；Online reading information errors rate is reduced simultaneously；
Cancel metallic shield casing simultaneously, reduce the occupation rate in system development costs and space；
4. improving the operating efficiency of logistics delivery, the economic loss caused by goods information mistake is reduced.
Brief description of the drawings
Fig. 1 is flow chart of the method for the present invention；
Fig. 2 is the hardware structure diagram of the present invention；
Fig. 3 is effective reading area planning chart of the present invention；
Fig. 4 is the method mathematics model flow figure of the determination read range of the present invention.
Embodiment
Below in conjunction with the accompanying drawings and embodiment the present invention is described in further detail.
Including RFID data acquisition subsystem, detection subsystem, control subsystem, system server, specification RFID recognitions
The computational methods of scope.
RFID data acquisition subsystem includes reader, antenna and the RFID being attached on object.RFID electricity
Subtab card is attached on measurement instrument, carried on the Turnover Box of measurement instrument, or the carton outer surface of carrying measurement instrument,
It carries measurement instrument or the information of carrier and unique ID codes of identification.Reader is arranged on goods transfer passage
Above, it is necessary to carry out on the key node of information gathering or information checking.Handed over by wireless technology or cable technology by network
Mode of changing planes tandem is to data server.
Detection subsystem refers to the carrier that measurement instrument is detected by image identification system.The Turnover Box in power system
For electric power blueness, then color is middle yellow to carton carrying ammeter, and it is " 1 " that electric power blueness is set in image detection subsystem, in
Yellow is " 0 ", and carrier information is obtained by image procossing.Worked and stopped using sensor-triggered RFID data acquisition system
Work.
Control subsystem mainly includes control RFID data acquisition system mode of operation；Adjustment RFID data acquisition system has
Working range is imitated, according to the difference of field condition needs that it is reasonably planned and disposed, makes RFID data acquisition system
Reach preferable working condition；System basic information management；Gather the inquiry of historical data, the statistics of information；Analysis system can
By property and validity.
Server includes data server and application server, the RFID that database server data collecting system collects
The related data informations such as the information of electronic tag, time.Realize and calculate using TCP/IP procotols by the network switch
The communication of machine.Application server is used to run application services, and system is conducted interviews by web modes, realizes RFID electricity
The reception of subtab information and logical process work.
During the logistics delivery of electric-power metering, measurement instrument is mainly held with the carrying of single Turnover Box and single carton
Carry two ways to be conveyed on logistics delivery line, in the induction system course of work, needed at key node to meter
Tool information such as is acquired, verified at the work.The single Turnover Box or paper for only reading current this node passed through can be accomplished
Measurement instrument RFID information in case, without reading the measurement instrument in other adjacent turnning boxes or carton
RFID information.
First according to the working environment of system, a kind of rational algorithm selected in UHF-RFID ranging technologies；Pass through this
The calculating of kind algorithm, analyzes and carrys out a rational read range；The electronic labeling information outside reading area is read when system
When, method is screened by threshold calculations, reaches the effect for rejecting region dispatch from foreign news agency subtab.
The present invention provides a kind of system and method for preventing from misreading mobile object reading area external information, including：RFID
Data acquisition subsystem, detection subsystem, control subsystem, system server, the computational methods of specification RFID read ranges.
RFID uses ultrahigh frequency electronic tag；Antenna is 8dBi；Read write line uses Impinj Revolution
Series；Read write line maximum transmission power is 32.5dBm.
RFID data acquisition subsystem include the installation measurement instrument of ultrahigh frequency electronic tag, support container, measurement antenna,
Feeder line, ultrahigh frequency radio frequency identification (RFID) reader, antenna holder, measurement antenna are connected with ultrahigh frequency radio frequency identification (RFID) reader by feeder line, measure day
Line is rack-mount, according to on-the-spot test effect, can carry out the movement of angles and positions.
Detection subsystem in vision inspection apparatus, photoelectric detection system composition system, is checked support container, the
The GPIO that one photoelectric detection system triggers ultrahigh frequency radio frequency identification (RFID) reader by signal cable gathers electronic labeling information.Carrying is held
Device reaches the GPIO stopping collection electronics marks that second photoelectric detection system triggers ultrahigh frequency radio frequency identification (RFID) reader by signal cable
Label letter.
Control subsystem is handled gathered data, and data storage is in database server.Data in the present invention
Server, application server composition system server, are connected, database server number by the network switch with control subsystem
The related data informations such as the information of the RFID collected according to acquisition system, time.Used by the network switch
TCP/IP procotols are realized and control subsystem communication.Application server is used to run application services, passes through web modes
System is conducted interviews, realizes the reception and logical process work of RFID information.Ultrahigh frequency radio frequency identification (RFID) reader, data
Server, application server, control subsystem form LAN by TCP/IP.
The system topology figure of the embodiment of the present invention is as shown in Figure 2.
It is a kind of to prevent the work flow for misreading the system and method for mobile object reading area external information from including carrying and holding
Device reaches vision inspection apparatus, wherein it is " 1 " that electric power blueness is set in vision-based detection subsystem, middle yellow is " 0 ", and identification is held
It is Turnover Box or carton to carry container, confirms the type of support container.When support container reaches system specified location, triggering the
Behind one photoelectric detection system position, photoelectric detection system sends high level signal, and triggering ultrahigh frequency radio frequency identification (RFID) reader starts work
Make, gather the information of electronic tag, the information collected carries out region recognition by algorithm proposed by the present invention, rejects and effectively reads
The electronic labeling information outside region is taken, the information in effective reading area is stored into data server, by controlling subsystem
Unite and the situation and valid data at scene are analyzed, reach the recognition work for preferably reading effect and valid data.
Effective read range of specification RFID data acquisition system.The support container conveyed in roller-way conveying is maximum
Appearance and size is 720mm (length) * 450mm (width), and height highest order 280mm, support container is according to the conveying of 450mm directions, metering
Utensil is up to 100mm, and the RFID of the bottom is from being 100mm with a distance from conveyor surface.
The maximum read range of planning is considered with full-size, read range is planned to antenna holder axis and conveying
The intersection point of the intersecting line in face, pipeline axis and this line is the circle of position heart, and radius is R circle, the reading model as effective plane
Enclose.Wherein radius R computational methods：Support container conveys among pipeline, puts aside displacement error, as shown in figure 4, its
Middle Lkx=80mm, support container length Lrq=720mm, so
L2=Lkx+Lrq=800mm
Systems organization measures antenna to the distance L of support container bottom surface3=480mm, measurement instrument electronic tag distance are held
Device bottom surface distance Hjlqj=100mm
L1=L3–Hjlqj=380mm
Theoretical by similar triangles
L1/L2=L3/R
So R=L2*L3/L1≈1011mm；
In view of equipment error and measurement error, R is set to 1100mm.In the present invention, effectively read-write scope is cooked up
As shown in Figure 3.
Effective read range is obtained by calculating in the embodiment of the present invention, to the RFID electronics marks in defined read range
Label are distinguished and gathered, and forbid other equipment and support container interference system being present in prescribed limit.Read more than effective
In the range of electronic labeling information rejected.The algorithm that electronic labeling information was disturbed and misread in rejecting uses UHF electronic mark
Ranging technology in label, measurement RFID carry out interference label apart from the distance of electronic tag by the judgement of distance
The rejecting of information.
As shown in figure 4, wherein L is both read write line and the ultimate range of effective RFID, calculated by algorithm
It is less than to distance or is regarded as reasonable label apart from label equal to L, otherwise, the distance being calculated is more than this distance
Label is both to misread interference label, and information will be removed by control system, L computational methods：
So L ≈ 1200mm.
Read write line is obtained in the present invention to the computational methods of the distance between electronic tag：Read write line is sent to electronic tag
Carrier signal, by taking sine wave as an example, read write line send carrier signal be
Wherein, f0For carrier frequency, f in the present embodiment0=920MHz.
After electronic tag backscattered modulation, the carrier signal (not considering amplitude modulation(PAM)) that read write line is received is only
It is actually to lag and (do not consider electronic tag decoding and scramble time)
T=2L/c
Wherein, L is the distance between electronic tag and read write line, c=3*108M/s is propagation velocity of electromagnetic wave.
Calculate and try to achieve in the present embodiment
Lmax=1.2m so, Tmax=2*1.2/3*108=0.8*10-8s
Consider that systematic error and environment influence, time T is taken it is one level higher after, measurement accuracy can be improved further,
So going the lag time to be
Tmax=1*10-7S so, Lmax=1.5m
Threshold value T=1*10 is finally confirmed in the embodiment of the present invention-7S, intersect among with conveyer with RFID antenna support
Point is the center of circle, is effective read range in the scope using L=1.5m as the circle of radius.Read write line feedback is obtained in application server
The lag time included in information, t was lag time, t as basis for estimation>T, system think that this electronic tag is not belonging to rationally
In the range of electronic tag, information will be removed, and t≤T, system thinks the electronics mark that this electronic tag belongs in zone of reasonableness
Label, information will be saved to data server.
Claims (2)
- A kind of 1. method for preventing from misreading mobile object reading area external information, it is characterised in that：Comprise the following steps：Step 1：System carries out Initialize installation, on the key node for needing to carry out information gathering or information checking, passes through The hysteresis of the RFID reader RFID information related to antenna acquisition and the RFID information of measurement instrument Time；Step 2：The RFID information collected is stored to application server, label information type is judged, filters out The RFID information of measurement instrument carries out corresponding with the FRID label information of its support container；Step 3：By RFID located in connection algorithms, threshold value is calculated；Step 4：The relation between the RFID lag time of measurement instrument and threshold value is judged, to the RFID of measurement instrument Electronic labeling information is handled, and obtains correct label information；The RFID located in connection algorithm is：Step 1：By the vertical range of the RFID of RFID antenna known to system to measurement instrument, according to similar triangle The proportionate relationship of shape, draw the radius value of the effective read range of plane；Step 2：Radius value and Atria frontier juncture system as obtained by calculating, draw RFID antenna having to RFID Effect reads distance L；Step 3：By formula T=2*L/c, it is propagation velocity of electromagnetic wave to draw threshold value T, wherein c.
- 2. the method according to claim 1 for preventing from misreading mobile object reading area external information, it is characterised in that：Institute State and judge that the relation between the RFID lag time of measurement instrument and threshold value includes procedure below：If the lag time of the RFID information of measurement instrument is not more than threshold value, by the RFID information Store to data server, otherwise store the RFID information to exception database, and abnormal data is divided Analysis.
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107742135A (en) * | 2016-06-28 | 2018-02-27 | 国网冀北电力有限公司物资分公司 | A kind of box batch radio-frequency recognition system and method |
| CN107145811B (en) * | 2017-05-26 | 2023-11-03 | 上海赋拓物联网技术有限公司 | RFID boundary determining method and system based on reference label |
| CN107742138A (en) * | 2017-10-13 | 2018-02-27 | 李志毅 | A kind of luggage whole process tracking system and method based on RFID |
| CN108595996B (en) * | 2018-06-11 | 2023-07-07 | 上海双十信息科技有限公司 | Anti-serial-reading ultrahigh-frequency RFID system and method based on wireless signal interference technology |
| BR112021015541A2 (en) * | 2019-02-08 | 2022-01-11 | Allflex Australia Pty Ltd | electronic animal tag reader |
| CN111695366B (en) * | 2019-03-14 | 2024-03-01 | 北京京东乾石科技有限公司 | Electronic tag reading method and device for settlement channel |
| CN111311841A (en) * | 2020-01-21 | 2020-06-19 | 南京景诺电气有限公司 | Safety tool cabinet of transformer substation |
| CN114254663B (en) * | 2020-09-22 | 2024-04-02 | 上海宝信软件股份有限公司 | Method, system and medium for preventing misreading of RFID electronic tags on multiple adjacent objects |
| CN113435550B (en) * | 2021-06-04 | 2023-05-09 | 任里伟 | Electronic tag identification method for wireless radio frequency system, computer device and computer readable storage medium |
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