CN104749557B - A kind of RF tag localization method and system - Google Patents
A kind of RF tag localization method and system Download PDFInfo
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- CN104749557B CN104749557B CN201510097959.6A CN201510097959A CN104749557B CN 104749557 B CN104749557 B CN 104749557B CN 201510097959 A CN201510097959 A CN 201510097959A CN 104749557 B CN104749557 B CN 104749557B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
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Abstract
The invention discloses a kind of RF tag localization method, methods described includes：The phase value of multiple RF tag reflected signals to be measured is obtained, and records the phase value collection moment；The position of multiple RF tags to be measured is determined according to the phase value and phase value collection moment.The system includes：Multiple RF tags to be measured, the RF tag to be measured is arranged along the first direction and/or second direction；Directional aerial, for multiple RF tags to be measured transmitting detection signals, and can in the first direction or second direction movement；Radio-frequency transmitter, for obtaining the phase value of multiple RF tag reflected signals to be measured, and the phase value collection moment is recorded, this method is independent of any professional equipment, without additionally arranging terrestrial reference label, the accuracy for the position positioning for being marked with RF tag object is improved.
Description
Technical field
The present invention relates to field of radio frequency identification, more particularly to a kind of RF tag localization method and system.
Background technology
The positional information of object how is obtained, is always one of the major issue of scientific research circle concern.The position of object is usual
Two kinds of absolute position and relative position can be divided into.The absolute position of object refers to coordinate of the object in world coordinate system.And
The relative position of object refers to relative position of the target object in a group object.For a long time, researchers attempted a lot
Method comes the absolute position of captures object, also achieves good locating effect.Positioning precision is not gradually increased to from meter level
Decimetre rank.But the upper layer application based on object space often focuses more on the relative position of object.For example in library,
Compared with the absolute position for knowing a book, for example《Hamlet》Positioned at coordinate (23,42) place, reader is more willing to know the book
Relative position.For example,《Hamre figure》In the second row the 5th row of the 3rd bookshelf.In another example in supermarket, compared with knowing
For example where coordinate of the objective food in world coordinate system, shopper is more willing to know relative position of the food in supermarket,
Which row on individual shelf, which is individual.
Although conventional localization method can obtain the exact position of object first, the thing is then obtained by Coordinate Conversion
The relative position of body.But this coordinate transform process often brings very big error.At present, using RF tag, use
The localization method of signal characteristic matching, positioning precision is up to 12cm.But in library, it is understood that book is close row with book
Row.One book perhaps can be placed on the position that some books are differed apart from origin-location by 12cm position error.In addition, although
There is research work to reach the other positioning precision of Centimeter Level using non-commercial equipment.But this kind of localization method generally relies on cost
Expensive professional equipment, therefore without popularized type and universality.
The content of the invention
It is an object of the invention to propose a kind of RF tag localization method and system, to improve the positioning accurate of RF tag
Degree.
In a first aspect, the invention provides a kind of RF tag localization method, including：
The phase value of multiple RF tag reflected signals to be measured is obtained, and records the phase value collection moment；
The position of multiple RF tags to be measured is determined according to the phase value and phase value collection moment.
Further, the position of multiple RF tags to be measured is determined according to the phase value and phase value collection moment
Put, including：
According to the phase value and phase value collection moment, the position of multiple RF tags to be measured in a first direction is determined
Put and/or second direction position；
The plurality of RF tag to be measured is arranged along the first direction and/or second direction.
Further, the moment is gathered according to the phase value and phase value, determines multiple RF tags to be measured in institute
The position of first direction is stated, including：
According to the phase value of acquisition and the acquisition time of the phase value, obtain multiple RF tag phase values to be measured and become
Change profile；
Obtain the symmetrical collection moment of multiple RF tag phase value changes profiles to be measured；
According to the symmetrical collection moment of multiple RF tag phase value changes profiles to be measured, determine multiple described to be measured
RF tag is in the position of the first direction.
Further, according to the phase value of acquisition and the acquisition time of the phase value, multiple radio frequency marks to be measured are obtained
Phase value changes profile is signed, including：
Obtain the phase value vector of multiple RF tags to be measured；
Set up the vectorial distance matrix with default template phase value vector of phase value of multiple RF tags to be measured；
The Optimum Matching path of multiple RF tags to be measured is calculated, according to the optimal of multiple RF tags to be measured
Coupling path determines to obtain multiple RF tag phase value changes profiles to be measured.
Further, in the phase value according to acquisition and the acquisition time of the phase value, multiple radio frequencies to be measured are obtained
After label phase value changes profile, in addition to：
Quadratic fit is carried out to multiple RF tag phase value changes profiles to be measured, quadratic fit model is obtained.
Further, the moment is gathered according to the phase value and phase value, determines multiple RF tags to be measured in institute
The position of first direction is stated, including：
At the symmetrical collection moment in quadratic fit model, determine multiple RF tags to be measured in the first party
To position.
Further, the moment is gathered according to the phase value and phase value, determines the RF tag to be measured described the
The position in two directions, including：
According to multiple RF tag phase value rates of change to be measured, determine the RF tag to be measured in the second party
To position.
Further, according to multiple RF tag phase value rates of change to be measured, determine that the RF tag to be measured exists
The position of the second direction, including：
Phase value in multiple RF tag phase value changes profiles to be measured is divided into k parts, and calculated per a
Phase average；
The phase value rate of change of the more multiple RF tags to be measured of traversal, determines the RF tag to be measured described
The position of second direction.
Further, according to multiple RF tag phase value rates of change to be measured, determine that the RF tag to be measured exists
The position of the second direction, in addition to：
The Euclidean distance between multiple RF tags to be measured is calculated, and determines the RF tag to be measured in the second direction
Position.
Second aspect, present invention also offers a kind of radio frequency tag location system, including：
Multiple RF tags to be measured, the RF tag to be measured is arranged along the first direction and/or second direction；
Directional aerial, for multiple RF tags to be measured transmitting detection signals, and can in the first direction or second party
To movement；
Radio-frequency transmitter, for obtaining the phase value of multiple RF tag reflected signals to be measured, and records phase value
Gather the moment.
The embodiment of the present invention records the phase value by obtaining the phase value of multiple RF tag reflected signals to be measured
The moment is gathered, the position of multiple RF tags to be measured, this method are determined according to the phase value and phase value collection moment
Independent of any professional equipment, without extra arrangement terrestrial reference label, the position positioning that is marked with RF tag object is improved
Accuracy.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to do one simply to introduce, it should be apparent that, drawings in the following description are this hairs
Some bright embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can be with root
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of flow chart for RF tag localization method that the embodiment of the present invention one is provided；
Fig. 2 is a kind of flow chart for RF tag localization method that the embodiment of the present invention two is provided；
Fig. 3 is the collection RF tag phase value to be measured that the embodiment of the present invention two is provided and the collection moment of the phase value
Schematic diagram；
Fig. 4 is the RF tag phase value changes outline drawing to be measured that the embodiment of the present invention two is provided；
Fig. 5 carries out quadratic fit for what the embodiment of the present invention two was provided to RF tag phase value changes profile to be measured, obtains
Obtain quadratic fit model schematic；
Fig. 6 is the flow chart for the multiple RF tag phase value changes profiles to be measured of acquisition that the embodiment of the present invention three is provided；
Fig. 7 is a kind of flow chart of the localization method for RF tag that the embodiment of the present invention four is provided；
Fig. 8 is a kind of structural representation of radio frequency tag location system provided in an embodiment of the present invention.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, hereinafter with reference to attached in the embodiment of the present invention
Figure, technical scheme is clearly and completely described by embodiment, it is clear that described embodiment is the present invention one
Section Example, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making
Go out the every other embodiment obtained under the premise of creative work, belong to the scope of protection of the invention.
Embodiment one
Fig. 1 is a kind of flow chart for RF tag localization method that the embodiment of the present invention one is provided, referring to Fig. 1, this method
Including：
Step 11, the phase value for obtaining multiple RF tag reflected signals to be measured, and record the phase value collection moment.
Wherein, multiple RF tags to be measured are attached on object, and to mark object space, the RF tag to be measured can
To receive the detection signal of directional aerial transmitting, and after detection signal is received, reflected signal, institute are launched to radio-frequency transmitter
State reflected signal and carry phase information, the distance that phase information reflects between RF tag to be measured and directional aerial.Radio-frequency transmitter
Extracted from the reflected signal received after phase value, and record the collection moment of now phase value.
Step 12, the positions of multiple RF tags to be measured determined according to the phase value and phase value collection moment.
The temporal correlation of phase value calculates to be measured in the reflected signal that radio-frequency transmitter is returned according to RF tag to be measured
The position of RF tag.
The embodiment of the present invention records the phase value by obtaining the phase value of multiple RF tag reflected signals to be measured
The moment is gathered, the position of multiple RF tags to be measured, this method are determined according to the phase value and phase value collection moment
Independent of any professional equipment, without extra arrangement terrestrial reference label, the position positioning that is marked with RF tag object is improved
Accuracy.
In the present invention, multiple RF tags to be measured can be arranged along the first direction and/or second direction, first direction
Can be vertical with second direction, 0-180 ° of angle, the invention is not limited in this regard can be presented between.What the present invention was provided
Method can gather the moment according to the phase value and phase value, determine the position of multiple RF tags to be measured in a first direction
Put and/or second direction position, below each preferred embodiment is specifically introduced.
Embodiment two
Fig. 2 is a kind of flow chart for RF tag localization method that the embodiment of the present invention two is provided.The embodiment of the present invention is led to
Cross receive RF tag reflected signal, speculated using the temporal correlation of reflected signal phase outgoing label in two-dimensional space
In position relationship, for example can apply on bookshelf books order and conveyer belt on luggage order accurately sorted
Deng.
Referring to Fig. 2, this method includes：
Step 21, the phase value for obtaining multiple RF tag reflected signals to be measured, and record the phase value collection moment.
The step is similar with step 11 implementation process in embodiment one, and therefore not to repeat here.
Step 22, the collection moment according to the phase value of acquisition and the phase value, obtain multiple RF tags to be measured
Phase value changes profile.
Each RF tag to be measured phase value in the given time and collection moment are gathered, and obtains each RF tag to be measured
Phase value with sampling instant change profile.Phase value and directional aerial and radio frequency to be measured in RF tag reflected signal to be measured
The distance dependent of label.Fig. 3 gathers RF tag phase value to be measured and the collection of the phase value to be provided in an embodiment of the present invention
The schematic diagram at moment.Exemplary referring to Fig. 3, the embodiment of the present invention is arranged as two in the first direction using 6 RF tags
OK, three row are arranged as in a second direction, when coordinate (x1, y2) is moved to (x2, y2) to directional aerial from figure, radio frequency mark to be measured
The distance between label 1 and directional aerial can first reduce and increase afterwards.When directional aerial in a first direction with second direction limit two
Projected position in bit plane it is parallel with the line of label 1 to be measured with second direction when, label 1 to be measured and directional aerial away from
From minimum.When directional aerial, coordinate (x1, y2) is moved to during (x2, y2) from from figure, and label 1,2,3 to be measured is swept successively
Retouch, radio-frequency transmitter can obtain RF tag 1 to be measured, 2,3, phase value, the phase value reacted RF tag to be measured with
The distance between directional aerial relation, and phase value is also along symmetrical at the minimum range of label to be measured and directional aerial.With
In the change of distance between RF tag to be measured and directional aerial, the RF tag reflected signal to be measured that radio-frequency transmitter is obtained
Phase value between 0-2 π circulation change.When directional aerial is closest apart from RF tag to be measured, phase is minimum, phase
It is worth and forms " V " type profile with the change of sampling instant, as shown in figure 4, wherein Fig. 4 ordinates are phase value, abscissa is
Sampling instant.
Step 23, the symmetrical collection moment for obtaining multiple RF tag phase value changes profiles to be measured.
Collection moment corresponding to the symmetric points of " V " the type profile obtained in step 22, as " V " type profile abscissa are most
The corresponding sampling instant of low spot, the moment be exactly directional aerial with the RF tag to be measured it is closest when it is corresponding at the time of.Should
The purpose of step is to obtain the symmetrical collection moment of above-mentioned all RF tag phase value changes profiles to be measured.
Step 24, the symmetrical collection moment according to multiple RF tag phase value changes profiles to be measured, determine multiple
The RF tag to be measured is in the position of the first direction.
By the time at the symmetrical collection moment of RF tag phase value changes profile to be measured obtained in comparison step 23
Order is judged in the position of the first direction multiple RF tags to be measured.For example, the label to be measured 1 shown in Fig. 3,
The symmetrical collection moment of 2,3 phase value changes profile is once t1, t2, t3, and t1<t2<T3, therefore, label 1,2,3 to be measured
Label 1 to be measured, label 2 to be measured, label 3 to be measured are followed successively by the position in the first direction.
The embodiment of the present invention is obtained multiple described to be measured by the collection moment of the phase value according to acquisition He the phase value
RF tag phase value changes profile, and the symmetrical collection moment is obtained according to the RF tag phase value changes profile to be measured,
According to the symmetrical collection moment of multiple RF tag phase value changes profiles to be measured, multiple RF tags to be measured are determined
In the position of the first direction, solving needs to rely on professional equipment or extra arrangement terrestrial reference label in the prior art to obtain
The problem of RF tag position to be measured, the technique effect for being accurately positioned RF tag to be measured is realized, positional accuracy is improved.
On the basis of the various embodiments described above, it is preferred that at the collection moment of the phase value according to acquisition He the phase value, obtain
After multiple RF tag phase value changes profiles to be measured, in addition to：To multiple RF tag phase values to be measured
Change profile and carry out quadratic fit, obtain quadratic fit model.Due to being usually associated with error in phase value measurement process, to subtract
Multiple RF tag phase value changes profiles to be measured are carried out quadratic fits by the influence that small measurement error is brought, and are obtained pair
The quadratic fit model answered.As shown in figure 5, multiple RF tag phase value changes profiles to be measured of acquisition are carried out secondary
Fitting, removes noise spot, obtains quadratic fit model then, the symmetrical collection moment in quadratic fit model, it is determined that many
The individual RF tag to be measured is in the position of the first direction, and the benefit so set is can to improve RF tag to be measured to exist
The degree of accuracy that position is positioned on first direction.
Embodiment three
On the basis of above-described embodiment, the embodiment of the present invention additionally provides a kind of multiple RF tag phases to be measured of acquisition
The method that place value changes profile, Fig. 6 is obtains the flow chart of multiple RF tag phase value changes profiles to be measured, referring to figure
6, including：
Step 31, the phase value vector for obtaining multiple RF tags to be measured；
For example, for a RF tag P to be measured, in collection moment ti, the RF tag P to be measured of acquisition phase value is
Pi, one group of phase value in collection a period of time T constitutes RF tag P1 phase values vector P (p1, p2 ... pi ... to be measured
Pn), wherein, the length of RF tag phase value vector P (p1, p2 ... pi ..., pn) to be measured is n, and n is RF tag phase to be measured
Place value collection is counted out.Similar, obtain the phase value vector of all RF tags to be measured.
Step 32, the vectorial distance with default template phase value vector of phase value for setting up multiple RF tags to be measured
Matrix；
Exemplary, it is (q1, q2 ..., qi ..., qm) by default template phase value vector mark, wherein, preset template
Phase value vector Q (q1, q2 ..., qi ..., qm) length is m, and m is that default template phase value collection is counted out.Set up to be measured
The phase value vector P of RF tag and default template phase value vector Q Distance matrix D, wherein, DI, j=| | pi-qj| |, Dij
For the i-th row jth column element in the phase value vector P and default template phase value vector Q of RF tag to be measured Distance matrix D
Value.For example, the phase value vector P length of RF tag to be measured is 4, it is 5, Distance matrix D to preset template phase value vector Q length
For 4 × 5 matrix, the row element of Distance matrix D first is followed successively by p1-q1, p1-q2, p1-q3, p1-q4, p1-q5；The distance
The column element of matrix D first is followed successively by p1-q1, p2-q1, p3-q1, p4-q1。
Step 33, the Optimum Matching path for calculating multiple RF tags to be measured, according to multiple radio frequency marks to be measured
The Optimum Matching path of label determines to obtain multiple RF tag phase value changes profiles to be measured.
Specifically, the calculation formula in the Optimum Matching path is：
CI, j=DI, j+min{CI, j-1, CI-1, j, CI-1, j-1}
The Optimum Matching path determined according to above-mentioned formula determines RF tag P to be measured phase value changes profile, obtains
Phase value and corresponding collection moment in " V " type profile.
The embodiment of the present invention is by setting up the phase value of RF tag to be measured according to the phase value vector of RF tag to be measured
The vectorial distance matrix with default template phase value vector, and the Optimum Matching path of RF tag to be measured is calculated, according to optimal
Coupling path determines RF tag phase value changes profile to be measured, so as to exclude outside RF tag phase value changes profile to be measured
Phase value, improves and subsequently determines the setting accuracy of RF tag to be measured in a first direction.
Example IV
Fig. 7 is a kind of flow chart of the localization method for RF tag that the embodiment of the present invention four is provided, as shown in fig. 7, institute
The method of stating includes：
Step 41, the phase value for obtaining multiple RF tag reflected signals to be measured, and record the phase value collection moment.
The step is similar with step 11 implementation process in embodiment one, and therefore not to repeat here.
Step 42, the moment gathered according to the phase value and phase value, determine the RF tag to be measured described second
The position in direction.
Specifically, the moment is gathered according to the phase value and phase value, determines the RF tag to be measured described second
The position in direction, including：According to multiple RF tag phase value rates of change to be measured, determine the RF tag to be measured in institute
State the position of second direction.
Referring still to Fig. 3, for RF tag 1 to be measured and RF tag 4 to be measured, the two ordinate is identical, therefore can quilt
Directional aerial is scanned simultaneously.Distance of the RF tag to be detected along second direction and directional aerial is bigger, the phase of the label
Rate of change is bigger.Because the distance of RF tag 4 to be measured and directional aerial is than between RF tag 1 to be measured and directional aerial
Distance is big, when directional aerial is moved, and the phase change rate of RF tag 1 to be measured is less than the phase change of RF tag 4 to be measured
Rate.Therefore, according to multiple RF tag phase value rates of change to be measured, determine the RF tag to be measured described second
The position in direction.
Further, on the basis of above-described embodiment, the embodiment of the present invention provides one kind according to multiple radio frequencies to be measured
Label phase value rate of change, determines the preferred embodiment of position of the RF tag to be measured in the second direction.
Specifically, according to multiple RF tag phase value rates of change to be measured, determine the RF tag to be measured in institute
The position of second direction is stated, including：
Phase value in multiple RF tag phase value changes profiles to be measured is divided into k parts, and calculated per a
Phase average；
For example, the phase value length in RF tag A to be measured phase value changes profile is 10, i.e., RF tag 1 to be measured
Phase value changes profile comprising 10 collection the moment.RF tag A to be measured 10 acquisition phase values are divided into k parts, shown
Example property, k is equal to 5, then per average value of a phase value for 2 phase values in this part, and the phase of i-th part of mark
It is worth for SA,i。
The phase value rate of change of the more multiple RF tags to be measured of traversal, determines the RF tag to be measured described
The position of second direction.
Specifically, for example it is and B by the phase value vector mark of the above-mentioned RF tag to be measured divided equally after handling, and
Pass through following equation RF tag A and B more to be measured phase value rate of change：
Wherein, O (A, B) judges the factor, S for the phase value vector A and B of RF tag to be measured phase value rate of changeA, iFor
The average value of i-th part of phase value, S in the phase value vector A of RF tag to be measuredB, iFor the phase value vector B of RF tag to be measured
In i-th part of phase value average value.When RF tag A to be measured phase value of the phase value rate of change than RF tag B to be measured becomes
When rate is high, O (A, B) levels off to 0.On the contrary, when A phase value rate of change is less than B phase value rate of change, O (A, B) convergence
In k.It therefore, it can determine the two positions of RF tag to be measured in a second direction according to O (A, B) measured value.
For each group of two compared RF tag to be measured, it is required for once being calculated using above-mentioned formula.Therefore,
When RF tag quantity to be measured is more, the location Calculation amount of RF tag second direction position to be measured is carried out using above-mentioned formula
It is very huge.Based on this reason, on the basis of the various embodiments described above, the embodiment of the present invention additionally provides a kind of determination radio frequency to be measured
The position preferred embodiment of label in a second direction, specifically, using following equation calculate two RF tag A to be measured and
B Euclidean distance：
The formula characterizes the physical distance between two RF tags to be measured, the thing between two RF tags to be measured
Reason distance is bigger, and the distance value that the formula is obtained is bigger.Therefore, when there is the RF tag to be measured that N number of needs are positioned, only need to carry out
N times, which compare, just can determine this distance of N number of RF tag to be measured in a second direction.
It should be noted that the moment is gathered according to the phase value of each RF tag to be measured of acquisition and phase value, it is determined that many
The position of the individual RF tag to be measured in a first direction, and the position of second direction can be carried out simultaneously, the skill of this area
Art personnel understand, according to concrete application scene the need for, can be according to the phase value and phase of each RF tag to be measured of acquisition
At the value collection moment, the position of multiple RF tags to be measured in a first direction is determined, to be measured can also be penetrated according to each of acquisition
At phase value and phase value the collection moment of frequency marking label, determine that multiple RF tags to be measured, in the position of second direction, may be used also
With the phase value of each RF tag to be measured according to acquisition and phase value collection moment, determine that multiple RF tags to be measured exist
The position of first direction, and second direction position, obtaining RF tag to be measured in the position of the first direction, and
After the position of second direction, position of each RF tag to be measured in two-dimensional space just can be obtained.
Embodiment five
Fig. 8 is a kind of structural representation of radio frequency tag location system provided in an embodiment of the present invention, described referring to Fig. 8
System includes：
Multiple RF tags to be measured 51, the RF tag to be measured is arranged along the first direction and/or second direction；
Directional aerial 52, for multiple RF tags to be measured transmitting detection signals, and can in the first direction or second
Move in direction；
Radio-frequency transmitter 53, for obtaining the phase value of multiple RF tag reflected signals to be measured, and records phase
The value collection moment.
The RF tag positioning system that the embodiment of the present invention is provided can be used for performing penetrating for any embodiment offer of the present invention
Frequency tag location method, possesses corresponding functional module, realizes identical beneficial effect.
Note, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art it is various it is obvious change,
Readjust and substitute without departing from protection scope of the present invention.Therefore, although the present invention is carried out by above example
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
Other more equivalent embodiments can be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (8)
1. a kind of RF tag localization method, it is characterised in that including：
The phase value of multiple RF tag reflected signals to be measured is obtained, and records the phase value collection moment；
The position of multiple RF tags to be measured is determined according to the phase value and phase value collection moment；
Wherein, the position that multiple RF tags to be measured are determined according to the phase value and phase value collection moment, bag
Include：
According to the phase value and phase value collection moment, the position of multiple RF tags to be measured in a first direction is determined
And/or the position of second direction；
Multiple RF tags to be measured are arranged along the first direction and/or second direction；
It is described that the moment is gathered according to the phase value and phase value, determine multiple RF tags to be measured in the first direction
Position, including：
According to the phase value of acquisition and the acquisition time of the phase value, multiple RF tag phase value changes wheels to be measured are obtained
It is wide；
Obtain the symmetrical collection moment of multiple RF tag phase value changes profiles to be measured；
According to the symmetrical collection moment of multiple RF tag phase value changes profiles to be measured, multiple radio frequencies to be measured are determined
Label is in the position of the first direction.
2. localization method according to claim 1, it is characterised in that according to the collection of the phase value of acquisition and the phase value
Time, multiple RF tag phase value changes profiles to be measured are obtained, including：
Obtain the phase value vector of multiple RF tags to be measured；
Set up the vectorial distance matrix with default template phase value vector of phase value of multiple RF tags to be measured；
The Optimum Matching path of multiple RF tags to be measured is calculated, according to the Optimum Matching of multiple RF tags to be measured
Path determines to obtain multiple RF tag phase value changes profiles to be measured.
3. localization method according to claim 2, it is characterised in that in adopting for the phase value according to acquisition and the phase value
After collection time, the multiple RF tag phase value changes profiles to be measured of acquisition, in addition to：
Quadratic fit is carried out to multiple RF tag phase value changes profiles to be measured, quadratic fit model is obtained.
4. localization method according to claim 3, it is characterised in that the moment is gathered according to the phase value and phase value,
Multiple RF tags to be measured are determined in the position of the first direction, including：
At the symmetrical collection moment in quadratic fit model, determine multiple RF tags to be measured in the first direction
Position.
5. localization method according to claim 2, it is characterised in that the moment is gathered according to the phase value and phase value,
The RF tag to be measured is determined in the position of the second direction, including：
According to multiple RF tag phase value rates of change to be measured, determine the RF tag to be measured in the second direction
Position.
6. localization method according to claim 5, it is characterised in that become according to multiple RF tag phase values to be measured
Rate, determines the RF tag to be measured in the position of the second direction, including：
Phase value in multiple RF tag phase value changes profiles to be measured is divided into k parts, and calculated per a phase
Position average；
The phase value rate of change of the more multiple RF tags to be measured of traversal, determines the RF tag to be measured described second
The position in direction.
7. localization method according to claim 6, it is characterised in that become according to multiple RF tag phase values to be measured
Rate, determines the RF tag to be measured in the position of the second direction, in addition to：
The Euclidean distance between multiple RF tags to be measured is calculated, and determines the RF tag to be measured in the position of the second direction
Put.
8. a kind of radio frequency tag location system, it is characterised in that including：
Multiple RF tags to be measured, the RF tag to be measured is in the first direction and/or second direction is arranged；
Directional aerial, for multiple RF tags to be measured transmitting detection signals, and can in the first direction or second direction is moved
It is dynamic；
Radio-frequency transmitter, for obtaining the phase value of multiple RF tag reflected signals to be measured, and records phase value collection
Moment；
The radio-frequency transmitter, is additionally operable to the collection moment of the phase value and the phase value according to acquisition, obtains multiple described treat
Survey RF tag phase value changes profile；When obtaining the symmetrical collection of multiple RF tag phase value changes profiles to be measured
Carve；According to the symmetrical collection moment of multiple RF tag phase value changes profiles to be measured, multiple radio frequencies to be measured are determined
The position of label in a first direction.
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| CN106932752A (en) * | 2015-12-29 | 2017-07-07 | 常州浅湾电子科技有限公司 | A kind of real-time indoor orientation method based on RF phse monitoring |
| CN105844191B (en) * | 2016-03-22 | 2019-03-08 | 中国科学院信息工程研究所 | Method and system for judging movement direction of electronic tag based on radio frequency identification |
| CN106066977B (en) * | 2016-06-12 | 2018-10-30 | 西安交通大学 | A kind of label two dimension method for sequencing moved using object |
| JP7195750B2 (en) * | 2018-03-29 | 2022-12-26 | サトーホールディングス株式会社 | LOCATION SYSTEM, LOCATION METHOD, AND PROGRAM |
| CN113945059A (en) * | 2020-07-15 | 2022-01-18 | 海信（山东）冰箱有限公司 | A refrigerator and a method for positioning based on RFID tags |
| 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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| US20090002165A1 (en) * | 2007-06-28 | 2009-01-01 | Micron Technology, Inc. | Method and system of determining a location characteristic of a rfid tag |
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