CN105844191B - Electronic tag direction of motion judgment method and system based on radio frequency identification - Google Patents
Electronic tag direction of motion judgment method and system based on radio frequency identification Download PDFInfo
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- CN105844191B CN105844191B CN201610165319.9A CN201610165319A CN105844191B CN 105844191 B CN105844191 B CN 105844191B CN 201610165319 A CN201610165319 A CN 201610165319A CN 105844191 B CN105844191 B CN 105844191B
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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
- G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
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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.
- G06K7/10079—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 spatial domain, e.g. temporary shields for blindfolding the interrogator in specific directions
- G06K7/10089—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 spatial domain, e.g. temporary shields for blindfolding the interrogator in specific directions the interrogation device using at least one directional antenna or directional interrogation field to resolve the collision
- G06K7/10099—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 spatial domain, e.g. temporary shields for blindfolding the interrogator in specific directions the interrogation device using at least one directional antenna or directional interrogation field to resolve the collision the directional field being used for pinpointing the location of the record carrier, e.g. for finding or locating an RFID tag amongst a plurality of RFID tags, each RFID tag being associated with an object, e.g. for physically locating the RFID tagged object in a warehouse
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Abstract
The present invention relates to electronic tag direction of motion judgment methods and system based on radio frequency identification, comprising: obtains radio-frequency antenna when detecting electronic tag, the phase of echo that radio-frequency antenna is read；Wherein, radio-frequency antenna at least two；Calculate separately out the difference for the adjacent echoes phase value that each radio-frequency antenna is read；The difference of the adjacent echoes phase value read according to each radio-frequency antenna it is positive and negative, judge the direction of motion of electronic tag.The technical solution that embodiment of the present invention provides reduces the error that the factors such as interference, the multipath effect of environment introduce from data source header using the phase of echo of electronic tag as the major parameter of walking direction；Symbol using phase of echo difference is judged that eliminating the internal factor bring obscured due to phase cycling is influenced, and keeps the judgement in tag motion direction more accurate；And the calculating of phase difference and the judgement of the electronic tag direction of motion, complexity is all very low, keeps the judgement timeliness of the electronic tag direction of motion higher.
Description
Technical field
The present invention relates to radio frequency arts, in particular to a kind of electronic tag direction of motion judgement based on radio frequency identification
Method and system.
Background technique
Important item control is related to a unit even safety of party and state's secret, for a long time, always by artificial
Management.And since labor management mode process is cumbersome, inefficiency, real-time is poor, therefore will be gradually by intelligentized article
Replaced control.Radio Frequency Identification Technology, (Radio Frequency Identification, RFID), also known as less radio-frequency know
, be not a kind of communication technology, specific objective can be identified by radio signals and read and write related data, without identifying system with
Mechanical or optical contact is established between specific objective.RFID reader also divides mobile and fixed, RFID technique at present
Using very extensively, such as: library, access control system, food safety are traced to the source.Radio electronic label is product electronic code (EPC)
Physical support is attached on tracked article, circulation worldwide and can be identified and be read and write to it.Since radio frequency identification is one
The contactless automatic identification technology of kind, it passes through radiofrequency signal automatic identification target object and obtains related data, identifies work
Make to be operable with various adverse circumstances, and at low cost, read or write speed is fast, and real-time is good, therefore is answered extensively without manual intervention
Intelligence control for important item.
Entrance guard management is an important content of important item control.When important item is brought away from or brings into monitoring area
When, access control system is answered and alarm, to facilitate administrative staff to verify situation.When important item is taken away without authorization, administrative staff
It should intercept in time；When important item is brought into monitoring area, administrative staff should check in time, register.Therefore, judge important object
Direction of motion when product pass through access control system has significant application value.For the access control system based on RFID, judgement
The direction of motion of article judges the direction of motion for the radio electronic label being adhered on article.
Double antenna RFID reader is used in the prior art, introduces the concept of " weight temporal ", RFID label tag is passed through
The time read every time when antenna, (Received Signal Strength Indicators, received signal were strong with RSSI
Degree instruction) value and the number that reads in this time are weighted, and are compared label and come by " weight temporal " of two antennas
Judge the direction of motion of testee.In the prior art, author Francesco Martinelli et al. combines RSSI and mark
The advantage for signing back wave phase proposes a kind of motion determination and localization method based on Unscented kalman filtering.
Since electronic tag echo signal intensity is easy by such environmental effects, and since electronic tag can distinguish distance
Uncertainty, the number that electronic tag is read by reader within a certain period of time are not known, therefore, with echo signal intensity value or
Reading times are inaccurate to time-weighted method.In addition, motion determination and localization method based on Unscented kalman filtering,
Complexity is high, and convergence rate is very slow, therefore it is larger to result in time delay, limits its engineer application.
Summary of the invention
The technical problem to be solved by the present invention is to how to provide a kind of high accuracy, low time delay based on radio frequency identification
Tag motion direction determination process.
For this purpose, the present invention provides a kind of electronic tag direction of motion judgment method based on radio frequency identification, comprising:
Radio-frequency antenna is obtained when detecting the electronic tag, the phase of echo that the radio-frequency antenna is read；Wherein, institute
State radio-frequency antenna at least two；
Calculate separately out the difference for the adjacent echoes phase value that each radio-frequency antenna is read；
The difference of the adjacent echoes phase value read according to each radio-frequency antenna it is positive and negative, judge the electronics mark
The direction of motion of label.
Preferably, the difference of the adjacent echoes phase value read according to each radio-frequency antenna is positive and negative, judgement
The direction of motion of the electronic tag out, comprising:
When the difference for the adjacent echoes phase value that the radio-frequency antenna is read is negative, the electronic tag is penetrated far from described
Frequency antenna；
When the difference for the adjacent echoes phase value that the radio-frequency antenna is read is timing, the electronic tag is penetrated close to described
Frequency antenna；
When the difference for the adjacent echoes phase value that the radio-frequency antenna is read is about zero, the electronic tag is penetrated from described
The distance of frequency antenna is nearest.
Preferably, after the difference for calculating separately out the adjacent echoes phase value that each radio-frequency antenna is read, also
Include:
When the ratio that the difference of adjacent echoes phase value described in preset time period is positive is greater than preset ratio, then institute is estimated
The difference for stating the adjacent echoes phase value in preset time period is positive；
When the ratio that the difference of adjacent echoes phase value described in preset time period is negative is greater than preset ratio, then institute is estimated
The difference for stating the adjacent echoes phase value in preset time period is negative；
When the number that the difference of adjacent echoes phase value described in preset time period is positive and the substantially uniform number being negative,
The difference for then estimating the adjacent echoes phase value in the preset time period is zero.
Preferably, when the difference for estimating the adjacent echoes phase value of the first radio-frequency antenna reading in the preset time period
It is negative, the difference for the adjacent echoes phase value that the second radio-frequency antenna is read is timing, and the electronic tag is far from described first
Radio-frequency antenna, close to second radio-frequency antenna；
When the difference for estimating the first radio-frequency antenna is read in the preset time period the adjacent echoes phase value is negative, the
When the difference for the adjacent echoes phase value that two radio-frequency antennas are read is negative, the electronic tag is far from first radio-frequency antenna
With second radio-frequency antenna.
When the difference for estimating the first radio-frequency antenna is read in the preset time period the adjacent echoes phase value is positive, the
The difference for the adjacent echoes phase value that two radio-frequency antennas are read is timing, and the electronic tag is close to first radio-frequency antenna
With second radio-frequency antenna；
When the difference for estimating the first radio-frequency antenna is read in the preset time period the adjacent echoes phase value is zero, the
The difference for the adjacent echoes phase value that two radio-frequency antennas are read is timing, and the electronic tag is from from first radio-frequency antenna
It is moved apart from nearest position to second radio-frequency antenna；
When the difference for estimating the first radio-frequency antenna is read in the preset time period the adjacent echoes phase value is zero, the
When the difference for the adjacent echoes phase value that two radio-frequency antennas are read is negative, the electronic tag is from from first radio-frequency antenna
It is moved apart from nearest position to the direction far from second radio-frequency antenna.
Preferably, the difference of the adjacent echoes phase value read according to each radio-frequency antenna is positive and negative, judgement
The direction of motion of the electronic tag out, further includes:
According to the positive and negative of the difference of the adjacent echoes phase value of multiple continuous preset time periods, the electricity is judged
The direction of motion of subtab.
Preferably, the radio-frequency antenna is separately positioned on the inner side and outer side of the outlet of area to be monitored, described in judgement
Whether electronic tag enters or leaves the area to be monitored.
On the other hand, the present invention also provides a kind of, and the electronic tag direction of motion based on radio frequency identification judges system, packet
It includes:
Phase of echo acquiring unit, when detecting the electronic tag for obtaining radio-frequency antenna, the radio-frequency antenna is read
The phase of echo got；Wherein, the radio-frequency antenna at least two；
Computing unit, for calculating separately out the difference for the adjacent echoes phase value that each radio-frequency antenna is read；
Judging unit, the difference of the adjacent echoes phase value for being read according to each radio-frequency antenna it is positive and negative, sentence
The direction of motion of the disconnected electronic tag out.
Preferably, the computing unit is also used to:
When the ratio that the difference of adjacent echoes phase value described in preset time period is positive is greater than preset ratio, described in estimation
The difference of the adjacent echoes phase value in preset time period is positive；
When the ratio that the difference of adjacent echoes phase value described in preset time period is negative is greater than preset ratio, described in estimation
The difference of the adjacent echoes phase value in preset time period is negative；
When the number that the difference of adjacent echoes phase value described in preset time period is positive and the substantially uniform number being negative,
The difference for estimating the adjacent echoes phase value in the preset time period is zero.
Preferably, the judging unit is also used to:
When the difference for the adjacent echoes phase value that the radio-frequency antenna is read is negative, judge the electronic tag far from institute
State radio-frequency antenna；
When the adjacent echoes phase value that the radio-frequency antenna is read difference be timing, judge the electronic tag close to institute
State radio-frequency antenna；
When the difference for the adjacent echoes phase value that the radio-frequency antenna is read is zero, judge the electronic tag from described
The distance of radio-frequency antenna is nearest.
Preferably, the radio-frequency antenna is separately positioned on the inner side and outer side of the outlet of area to be monitored, described in judgement
Whether electronic tag enters or leaves the area to be monitored.
The electronic tag direction of motion judgment method based on radio frequency identification that embodiment of the present invention provides, by obtaining extremely
Lack the phase value that two antennas are read and calculates adjacent phase difference to carry out the direction of motion judgement of electronic tag, the present invention
Embodiment using the phase of echo of electronic tag rather than the RSSI in conventional method (instruction of received signal intensity) as
The major parameter of walking direction reduces the error of the factors such as interference, the multipath effect of environment introducing in terms of data source header；This
Symbol of the invention using the difference value of phase of echo, and the absolute figure of non-phase or difference value are eliminated due to phase cycling
Fuzzy inherent attribute bring influences, and keeps the judgement in tag motion direction more accurate；And calculating and the electricity of phase difference
The judgement of the subtab direction of motion, complexity is all very low, keeps the judgement timeliness of the electronic tag direction of motion higher.
Detailed description of the invention
The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, and attached drawing is schematically without that should manage
Solution is carries out any restrictions to the present invention, in the accompanying drawings:
Fig. 1 is a kind of electronic tag direction of motion judgment method based on radio frequency identification that embodiment of the present invention provides
Flow diagram；
Fig. 2 is the deployment schematic diagram for the radio-frequency antenna that embodiment of the present invention provides；
Fig. 3 is the schematic diagram of the phase of echo in the electronic tag motion process that embodiment of the present invention provides；
Fig. 4 is the phase difference sequence diagram in the electronic tag motion process that embodiment of the present invention provides；
Fig. 5 is that Fig. 4 gets rid of phase hit point and amplified phase difference sequence diagram；
Fig. 6 is the schematic diagram for the electronic tag direction of motion that embodiment of the present invention provides.
Specific embodiment
Below in conjunction with attached drawing, embodiments of the present invention is described in detail.
As shown in Figure 1, embodiment of the present invention provides a kind of electronic tag direction of motion judgement based on radio frequency identification
Method, comprising:
S101: obtaining radio-frequency antenna when detecting electronic tag, the phase of echo that radio-frequency antenna is read；Wherein, radio frequency
Antenna at least two；
S102: the difference for the adjacent echoes phase value that each radio-frequency antenna is read is calculated separately out；
S103: the difference of the adjacent echoes phase value read according to each radio-frequency antenna it is positive and negative, judge electronic tag
The direction of motion.
The electronic tag direction of motion judgment method based on radio frequency identification that embodiment of the present invention provides, by obtaining extremely
Lack the phase value that two antennas are read and calculates adjacent phase difference to carry out the direction of motion judgement of electronic tag, the present invention
Embodiment is using the phase of echo of electronic tag rather than the RSSI in conventional method is as the major parameter of walking direction, from
The error of the factors such as interference, the multipath effect of environment introducing is reduced in terms of data source header；The present invention utilizes the difference of phase of echo
The symbol of score value, and the absolute figure of non-phase or difference value eliminate the inherent attribute bring obscured due to phase cycling
It influences, keeps the judgement in tag motion direction more accurate；And the calculating of phase difference and the judgement of the electronic tag direction of motion,
Complexity is all very low, keeps the judgement timeliness of the electronic tag direction of motion higher.
Wherein, the electronic tag direction of motion judgment method based on radio frequency identification that embodiment of the present invention provides can be used
In RFID (radio frequency identification) access control system, two radio-frequency antennas are connected using a RFID reader 24.
Preferably, as shown in Fig. 2, radio-frequency antenna is separately positioned on the inner side and outer side of the outlet of area to be monitored 25, with
Judge whether electronic tag 21 enters or leave area to be monitored 25.Specifically, first radio frequency the second antenna 2 and the second radio frequency
The line of two antennas 3 is parallel to the direction that electronic tag 21 passes in and out access control system, and the distance between two radio-frequency antennas d is 0.5
Rice is between 1 meter.For the convenience of description, introducing plane right-angle coordinate, coordinate origin is located at the line center of two radio-frequency antennas,
Then the coordinate of available first radio frequency the second antenna 2 and second the second antenna of radio frequency 3 is respectivelyWithWhen penetrating
When frequency antenna detection is to electronic tag, phase of echo (t is recorded1i,θ1i), (t2i,θ2i)。(t1i,θ1i) and (t2i,θ2i) difference table
Show the phase of echo that the first radio-frequency antenna and the second radio-frequency antenna are read.
As shown in figure 3, electronic tag is during the motion, apparent changing rule is presented in echo phase information, can be with
See that phase of echo is gradually increased, and is reached 2 π and is jumped during electronic tag is towards antenna movement.It is reached in label
When nearest apart from antenna position, phase reaches peak value, and hereafter, during label is far from antenna movement, phase starts to subtract
It is small.It when being reduced to 0, jumps, then continues to reduce by 2 π.It is read according to the first radio-frequency antenna of record and the second radio-frequency antenna
Phase of echo (the t got1i,θ1i) and (t2i,θ2i), calculate the difference Δ θ of two adjacent phase of echo values1i=θ1i-θ1i-1, Δ θ2i
=θ2i-θ2i-1。
Preferably, the difference of the adjacent echoes phase value read according to each radio-frequency antenna it is positive and negative, judge the electricity
The direction of motion of subtab, comprising: when the difference for the adjacent echoes phase value that radio-frequency antenna is read is negative, electronic tag is separate
Radio-frequency antenna；When the difference for the adjacent echoes phase value that radio-frequency antenna is read is timing, electronic tag is close to radio-frequency antenna；When penetrating
When the difference for the adjacent echoes phase value that frequency antenna is read is about zero, electronic tag is nearest with a distance from radio-frequency antenna.
Specifically, by taking electronic tag is moved from the first radio-frequency antenna to the second radio-frequency antenna as an example, by its motion state point
For five stages: electronic tag is denoted as (- ∞, A from distant place close to the first radio-frequency antenna1)；Electronic tag is reached from the first radio frequency
The nearest distance of antenna, is denoted as A1→2；Electronic tag leaves the first radio-frequency antenna, moves to the second radio-frequency antenna, is denoted as (A1,
A2)；Electronic tag reach from the second radio-frequency antenna it is nearest with a distance from, be denoted as A2→∞；Electronic tag is reached from the second radio-frequency antenna most
Close position, is denoted as (A2,+∞).It similarly, can also when electronic tag is moved from the second radio-frequency antenna to the first radio-frequency antenna
It is divided into five stages, is denoted as (+∞, A respectively2),A2→1,(A2,A1),A1→∞,(A1,-∞).Particularly, when electronic tag moves
Backtracking again after to a certain position, the state of the reentry point is denoted as A by usT。
As shown in Fig. 4, it according to the changing rule of label echo phase, makes its difference sequence and (is subtracted with current phase value
Remove previous phase value).The phase hit point (point of ± 2 π of phase difference ≈) in attached drawing 4 is got rid of, is amplified and is redescribed
In attached drawing 5.From attached drawing 5 as can be seen that motion state and the phase difference of electronic tag it is positive and negative have it is apparent corresponding
Relationship.Remember Δ θ1iWith Δ θ2jI-th of the first radio-frequency antenna and j-th of differential phase value of the second radio-frequency antenna are respectively indicated,
Then in (- ∞, A1) stage, there is Δ θ1i> 0, Δ θ2j> 0, indicate label from the side of two radio-frequency antennas by distant place close to antenna
(can not judge at this time close from which side).In A1→2There is Δ θ in stage1i≈ 0, Δ θ2j> 0, indicate electronic tag arrived away from
The position nearest from the first radio-frequency antenna, and continue to move to the second radio-frequency antenna.In (A1,A2) stage, there is Δ θ1i< 0, Δ
θ2j> 0 indicates that label have passed through the first radio-frequency antenna and move to the second radio-frequency antenna, that is to say, that electronic tag passes through
Entrance enters monitoring area.In A2→∞There is Δ θ in stage1i< 0, Δ θ2j≈ 0 indicates that label is reached from the second radio-frequency antenna
Nearest position, at this point, the capable of emitting alarm of system informs that administrative staff have article to enter monitoring area.In (A2,+∞) and the stage,
There is Δ θ1i< 0, Δ θ2j< 0 indicates label far from two antennas.
Although electronic tag phase of echo has specific corresponding relationship at a distance from electronic tag to radio-frequency antenna,
It is only still may with the method that each phase difference carries out operation estimation since there is inevitable noise jammings in environment
Bring error.Further, since this inherent characteristic of the periodical jumping of phase, 2 π or -2 π can periodically occur in difference value
Situation.Obviously, this can interfere our deterministic process.
It is therefore preferred that after the difference for calculating separately out the adjacent echoes phase value that each radio-frequency antenna is read, also
It include: then to estimate preset time when the ratio that the difference of adjacent echoes phase value in preset time period is positive is greater than preset ratio
The difference of adjacent echoes phase value in section is positive；When the ratio that the difference of adjacent echoes phase value in preset time period is negative is greater than
When preset ratio, then estimate that the difference of the adjacent echoes phase value in preset time period is negative；When adjacent time in preset time period
When the number that the difference of wave phase value is positive and the substantially uniform number being negative, then the adjacent echoes phase in preset time period is estimated
The difference of value is zero.
Specifically, introducing sliding window mechanism, single value is replaced using the numerical characteristic of data most of in window
Judged, it is assumed that window width w, then time windowInterior value
Most of (>=70%) is timing, we enable Δ θ '1i=1, then utilize Δ θ '1iReplace Δ θ1iJudged.When big in window
When component values are negative, Δ θ ' is enabled1i=-1.When the substantially uniform distribution of positive and negative values in window, Δ θ ' is enabled1i=0, it calculates
(t1i,Δθ′1i) and (t2i,Δθ′2i)。
Preferably, when the difference for the adjacent echoes phase value that the first radio-frequency antenna is read in estimation preset time period is
Negative, the difference for the adjacent echoes phase value that the second radio-frequency antenna is read is timing, and electronic tag is far from the first radio-frequency antenna, close to the
Two radio-frequency antennas；
When the difference of adjacent echoes phase value that the first radio-frequency antenna is read in estimation preset time period is negative, the second radio frequency day
When the difference for the adjacent echoes phase value that line is read is negative, electronic tag is far from the first radio-frequency antenna and the second radio-frequency antenna.
When the difference of adjacent echoes phase value that the first radio-frequency antenna is read in estimation preset time period is positive, the second radio frequency day
The difference for the adjacent echoes phase value that line is read is timing, and electronic tag is close to the first radio-frequency antenna and the second radio-frequency antenna；
When the difference of adjacent echoes phase value that the first radio-frequency antenna is read in estimation preset time period is zero, the second radio frequency day
The difference for the adjacent echoes phase value that line is read is timing, and electronic tag is from nearest position with a distance from the first radio-frequency antenna to second
Radio-frequency antenna movement；
When the difference of adjacent echoes phase value that the first radio-frequency antenna is read in estimation preset time period is zero, the second radio frequency day
When the difference for the adjacent echoes phase value that line is read is negative, electronic tag is from nearest position with a distance from the first radio-frequency antenna far from
The direction of second radio-frequency antenna moves.
Specifically, enumerating all possible (Δ θ '1i,Δθ′2i) and its corresponding electronic tag motion state such as table
Shown in 1.
1 electronic tag motion state of table and numerical characteristic
| No | Δθ′1i,Δθ′2i | Tag motion state | The locating stage |
| 1 | Δθ′1i=1, Δ θ '2i=1 | Label two antenna movements of direction | (-∞,A1)(+∞,A2) |
| 2 | Δθ′1i=1, Δ θ '2i=0 | Label reaches the second antenna and moves to first antenna | A2→1 |
| 3 | Δθ′1i=1, Δ θ '2i=-1 | Label is moved from the second antenna to first antenna | (A2,A1) |
| 4 | Δθ′1i=0, Δ θ '2i=1 | Label reaches first antenna and to the second antenna movement | A1→2 |
| 5 | Δθ′1i=0, Δ θ '2i=0 | Label returns | AT |
| 6 | Δθ′1i=0, Δ θ '2i=-1 | Label reaches first antenna and far from the second antenna movement | A1→∞ |
| 7 | Δθ′1i=-1, Δ θ '2i=1 | Label is from first antenna to the second antenna movement | (A1,A2) |
| 8 | Δθ′1i=-1, Δ θ '2i=0 | Label reaches the second antenna and moves far from first antenna | (-∞,A1) |
| 9 | Δθ′1i=-1, Δ θ '2i=-1 | Label is far from two antenna movements | (A2,+∞)(A1,-∞) |
Preferably, the difference of the adjacent echoes phase value read according to each radio-frequency antenna it is positive and negative, judge electronics mark
The direction of motion of label, further includes: according to the positive and negative of the difference of the adjacent echoes phase value of multiple continuous preset time periods, judge electricity
The direction of motion of subtab.
Specifically, the motion state for the electronic tag that can be enumerated according to table 1 and being obtained by calculation multiple continuous pre-
If the adjacent echoes phase difference of period is positive and negative, the electronic tag direction of motion interior for a period of time is judged, as shown in fig. 6, can
To obtain the direction of motion of a variety of electronic tags, wherein when the motion state sequence of electronic tag is 1- > 4- > 7- > 8- > 9, table
Indicating label are moved from the first radio-frequency antenna to the second radio-frequency antenna.When electronic tag motion state sequence be 1- > 2- > 3- > 6- >
When 9, indicate that electronic tag is moved from the second radio-frequency antenna to the first radio-frequency antenna.When the motion state sequence of electronic tag is 1-
> 4- > 7- > 5- > 3- > 6- > 9 and when 1- > 2- > 3- > 5- > 7- > 8- > 9, indicate that electronic tag returns.Wherein, in electronic tag by
When one radio-frequency antenna is moved to the second radio-frequency antenna, at electronic tag position 8 nearest with a distance from the second radio-frequency antenna, system
Capable of emitting alarm；When electronic tag is moved from the second radio-frequency antenna to the first radio-frequency antenna, in electronic tag from the first radio frequency
When the nearest position 6 of antenna distance, the capable of emitting alarm of system.
On the other hand, embodiment of the present invention additionally provides a kind of electronic tag direction of motion judgement based on radio frequency identification
System, comprising:
Phase of echo acquiring unit, when detecting electronic tag for obtaining radio-frequency antenna, what radio-frequency antenna was read is returned
Wave phase；Wherein, the radio-frequency antenna at least two；
Computing unit, for calculating separately out the difference for the adjacent echoes phase value that each radio-frequency antenna is read；
Judging unit, the difference of the adjacent echoes phase value for being read according to each radio-frequency antenna it is positive and negative, judge
The direction of motion of electronic tag.
Preferably, computing unit is also used to:
When the ratio that the difference of adjacent echoes phase value in preset time period is positive is greater than preset ratio, preset time is estimated
The difference of adjacent echoes phase value in section is positive；
When the ratio that the difference of adjacent echoes phase value in preset time period is negative is greater than preset ratio, preset time is estimated
The difference of adjacent echoes phase value in section is negative；
When the number that the difference of adjacent echoes phase value in preset time period is positive and the substantially uniform number being negative, estimation
The difference of adjacent echoes phase value in preset time period is zero.
Preferably, judging unit is also used to:
When the difference for the adjacent echoes phase value that radio-frequency antenna is read is negative, judge electronic tag far from radio-frequency antenna；
When the adjacent echoes phase value that radio-frequency antenna is read difference be timing, judge electronic tag close to radio-frequency antenna；
When the difference for the adjacent echoes phase value that radio-frequency antenna is read is zero, judge electronic tag from radio-frequency antenna away from
From nearest.
Preferably, the radio-frequency antenna is separately positioned on the inner side and outer side of the outlet of area to be monitored, to judge electronics
Whether label enters or leaves area to be monitored.
A kind of electronic tag direction of motion judgment method and system based on radio frequency identification that embodiment of the present invention provides,
The judgement of the electronic tag direction of motion is carried out by obtaining the two radio-frequency antennas phase values that read and calculating phase difference, and
The label direction of motion interior for a period of time is judged according to the sequencing that the electronic tag direction of motion changes.By utilizing electronics mark
The phase of echo of label rather than major parameter of the RSSI as walking direction in conventional method, reduce in terms of data source header
The error that the factors such as environmental disturbances, multipath effect introduce；Using the symbol of phase difference, and the absolute figure of non-phase or phase
Difference, eliminating the inherent attribute bring obscured due to phase cycling is influenced；Utilize the symbol of most of numerical value in sliding window
Number replace a certain moment single value judged, improve the fault-tolerance and accuracy of this method.
In addition, the calculating being related in embodiment of the present invention can be completed by plus-minus, comparison operation, therefore its
Complexity is very low, is o (1)；Because calculating simple, the calculation delay of system is lower, and electronic tag need not move through it is all
Motion state can be gone out by system detection, and therefore, whole timeliness is higher.In addition, since this method is according to the symbol of phase difference
And it is nonumeric judged, so system has certain fault-tolerance, allow due to caused by the factors such as environment error.Into one
Step, due to the introducing of sliding time window mechanism, further reduce the presence of error, it is thus also avoided that the period of phase is fuzzy
Bring influences, and improves the accuracy and reliability of electronic tag direction of motion judgement.
Although the embodiments of the invention are described in conjunction with the attached drawings, but those skilled in the art can not depart from this hair
Various modifications and variations are made in the case where bright spirit and scope, such modifications and variations are each fallen within by appended claims
Within limited range.
Claims (9)
1. a kind of electronic tag direction of motion judgment method based on radio frequency identification characterized by comprising
Radio-frequency antenna is obtained when detecting the electronic tag, the phase of echo that the radio-frequency antenna is read；Wherein, described to penetrate
Frequency antenna at least two；
Calculate separately out the difference for the adjacent echoes phase value that each radio-frequency antenna is read；
The difference of the adjacent echoes phase value read according to each radio-frequency antenna it is positive and negative, judge the electronic tag
The direction of motion, including, when the difference for the adjacent echoes phase value that the radio-frequency antenna is read is negative, the electronic tag is separate
The radio-frequency antenna；When the difference for the adjacent echoes phase value that the radio-frequency antenna is read is timing, the electronic tag is close
The radio-frequency antenna；When the difference for the adjacent echoes phase value that the radio-frequency antenna is read is about zero, the electronic tag from
The distance of the radio-frequency antenna is nearest.
2. a kind of electronic tag direction of motion judgment method based on radio frequency identification according to claim 1, feature exist
In after the difference for calculating separately out the adjacent echoes phase value that each radio-frequency antenna is read, further includes:
When the ratio that the difference of adjacent echoes phase value described in preset time period is positive is greater than preset ratio, then estimate described pre-
If the difference of the adjacent echoes phase value in the period is positive；
When the ratio that the difference of adjacent echoes phase value described in preset time period is negative is greater than preset ratio, then estimate described pre-
If the difference of the adjacent echoes phase value in the period is negative；
When the number that the difference of adjacent echoes phase value described in preset time period is positive and the substantially uniform number being negative, then estimate
The difference for counting the adjacent echoes phase value in the preset time period is zero.
3. a kind of electronic tag direction of motion judgment method based on radio frequency identification according to claim 2, feature exist
In,
When the difference for estimating the adjacent echoes phase value of the first radio-frequency antenna reading in the preset time period is negative, second is penetrated
The difference for the adjacent echoes phase value that frequency antenna is read is timing, and the electronic tag is leaned on far from first radio-frequency antenna
Nearly second radio-frequency antenna；
When the difference for estimating the adjacent echoes phase value of the first radio-frequency antenna reading in the preset time period is negative, second is penetrated
When the difference for the adjacent echoes phase value that frequency antenna is read is negative, the electronic tag is far from first radio-frequency antenna and institute
State the second radio-frequency antenna；
When the difference for estimating the adjacent echoes phase value of the first radio-frequency antenna reading in the preset time period is positive, second is penetrated
The difference for the adjacent echoes phase value that frequency antenna is read is timing, and the electronic tag is close to first radio-frequency antenna and institute
State the second radio-frequency antenna；
When the difference for estimating the adjacent echoes phase value of the first radio-frequency antenna reading in the preset time period is zero, second is penetrated
The difference for the adjacent echoes phase value that frequency antenna is read is timing, and the electronic tag is from a distance from first radio-frequency antenna
Nearest position is moved to second radio-frequency antenna；
When the difference for estimating the adjacent echoes phase value of the first radio-frequency antenna reading in the preset time period is zero, second is penetrated
When the difference for the adjacent echoes phase value that frequency antenna is read is negative, the electronic tag is from a distance from first radio-frequency antenna
Nearest position is moved to the direction far from second radio-frequency antenna.
4. a kind of electronic tag direction of motion judgment method based on radio frequency identification according to claim 3, feature exist
In the positive and negative of, the difference of the adjacent echoes phase value read according to each radio-frequency antenna, the electronics mark is judged
The direction of motion of label, further includes:
According to the positive and negative of the difference of the adjacent echoes phase value of multiple continuous preset time periods, the electronics mark is judged
The direction of motion of label.
5. a kind of electronic tag direction of motion judgement side based on radio frequency identification according to any one of claims 1-4
Method, which is characterized in that
The radio-frequency antenna is separately positioned on the inner side and outer side of the outlet of area to be monitored, whether to judge the electronic tag
Into or leave the area to be monitored.
6. a kind of electronic tag direction of motion based on radio frequency identification judges system characterized by comprising
Phase of echo acquiring unit, when detecting the electronic tag for obtaining radio-frequency antenna, the radio-frequency antenna is read
Phase of echo；Wherein, the radio-frequency antenna at least two；
Computing unit, for calculating separately out the difference for the adjacent echoes phase value that each radio-frequency antenna is read；
Judging unit, the difference of the adjacent echoes phase value for being read according to each radio-frequency antenna it is positive and negative, judge
The direction of motion of the electronic tag.
7. a kind of electronic tag direction of motion based on radio frequency identification according to claim 6 judges that system, feature exist
In the computing unit is also used to:
When the ratio that the difference of adjacent echoes phase value described in preset time period is positive is greater than preset ratio, estimate described default
The difference of the adjacent echoes phase value in period is positive；
When the ratio that the difference of adjacent echoes phase value described in preset time period is negative is greater than preset ratio, estimate described default
The difference of the adjacent echoes phase value in period is negative；
When the number that the difference of adjacent echoes phase value described in preset time period is positive and the substantially uniform number being negative, estimation
The difference of the adjacent echoes phase value in the preset time period is zero.
8. a kind of electronic tag direction of motion based on radio frequency identification according to claim 6 judges that system, feature exist
In the judging unit is also used to:
When the difference for the adjacent echoes phase value that the radio-frequency antenna is read is negative, judge that the electronic tag is penetrated far from described
Frequency antenna；
When the difference for the adjacent echoes phase value that the radio-frequency antenna is read is timing, judge that the electronic tag is penetrated close to described
Frequency antenna；
When the difference for the adjacent echoes phase value that the radio-frequency antenna is read is about zero, judge that the electronic tag is penetrated from described
The distance of frequency antenna is nearest.
9. a kind of electronic tag direction of motion judgement system based on radio frequency identification according to claim 6-8 any one
System, which is characterized in that
The radio-frequency antenna is separately positioned on the inner side and outer side of the outlet of area to be monitored, whether to judge the electronic tag
Into or leave the area to be monitored.
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| JP7104563B2 (en) * | 2018-06-08 | 2022-07-21 | シャープ株式会社 | Animal identification device, control method and program of animal identification device |
| CN113945059A (en) * | 2020-07-15 | 2022-01-18 | 海信（山东）冰箱有限公司 | Refrigerator and positioning method based on RFID (radio frequency identification) tag |
| CN112085134B (en) * | 2020-09-09 | 2021-03-23 | 华清科盛(北京)信息技术有限公司 | Airport luggage identification system and method based on radio frequency identification |
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| US8688140B2 (en) * | 2011-04-26 | 2014-04-01 | Microchip Technology Incorporated | Radio frequency tag location system and method |
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