CN104749557A - Radio frequency tag positioning method and system - Google Patents
Radio frequency tag positioning method and system Download PDFInfo
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- CN104749557A CN104749557A CN201510097959.6A CN201510097959A CN104749557A CN 104749557 A CN104749557 A CN 104749557A CN 201510097959 A CN201510097959 A CN 201510097959A CN 104749557 A CN104749557 A CN 104749557A
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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
Abstract
The invention discloses a radio frequency tag positioning method; the method comprises the following steps: acquiring phase value of a plurality of radio frequency tag reflected signals to be detected, and recording the phase value acquisition time; confirming the positions of a plurality of radio frequency tags according to the phase value and the phase value acquisition time. The system comprises a plurality of radio frequency tags, the radio frequency tags are arranged in the first direction and/or in the second direction; a directional antenna used for emitting detection signal by a plurality of radio frequency tags and capable of moving along the first direction or the second direction; a radio frequency receiver used for acquiring the phase value of a plurality of radio frequency tag reflected signals to be detected, and recording the phase value acquisition time; the method does not rely on any professional equipment, additional landmark tags are not needed, and position positioning accuracy of the object marked with radio frequency tag can be improved.
Description
Technical field
The present invention relates to field of radio frequency identification, particularly relate to a kind of radio-frequency (RF) tag localization method and system.
Background technology
How to obtain the positional information of object, be one of major issue of scientific research circle concern always.The position of object can be divided into absolute position and relative position two kinds usually.The absolute position of object refers to the coordinate of object in world coordinate system.And the relative position of object refers to the relative position of target object in a group object.For a long time, researchers attempted the absolute position that a lot of method carrys out captures object, also achieved good locating effect.Positioning precision has not brought up to decimetre rank gradually from meter level.But the relative position of object is often more paid close attention to based on the upper layer application of object space.Such as in library, compared with the absolute position knowing a book, such as " hamlet " is positioned at coordinate (23,42) place, and reader is more ready to know the relative position of this book.Such as, " Hamre figure " arranges at second row the 5th of the 3rd bookshelf.Again such as in supermarket, compared with knowing the coordinate of objective food in world coordinate system, shopper is more ready to know the relative position of this food in supermarket, and such as, which row on which shelf, which is individual.
Although first localization method in the past can obtain the exact position of object, then obtained the relative position of this object by coordinate conversion.But this coordinate transform process often brings very large error.At present, utilize radio-frequency (RF) tag, adopt the localization method of signal characteristic coupling, positioning precision can reach 12cm.But in library, we know that book and book are close-packed arrays.A book perhaps can be placed on the position that distance origin-location differs some books by the positioning error of 12cm.In addition, although there is research work to utilize non-commercial equipment to reach other positioning precision of centimetre-sized.But this kind of localization method relies on arm and a leg professional equipment usually, therefore not there is popularized type and universality.
Summary of the invention
The object of the invention is to propose a kind of radio-frequency (RF) tag localization method and system, to improve the positioning precision of radio-frequency (RF) tag.
First aspect, the invention provides a kind of radio-frequency (RF) tag localization method, comprising:
Obtain the phase value of multiple radio-frequency (RF) tag reflected signal to be measured, and record the described phase value collection moment;
The position that the moment determines multiple described radio-frequency (RF) tag to be measured is gathered according to described phase value and phase value.
Further, gather according to described phase value and phase value the position that the moment determines multiple described radio-frequency (RF) tag to be measured, comprising:
Gather the moment according to described phase value and phase value, determine the multiple described position of radio-frequency (RF) tag to be measured at first direction and/or the position of second direction;
Wherein multiple described radio-frequency (RF) tag to be measured is along described first direction and/or second direction arrangement.
Further, gather the moment according to described phase value and phase value, determine that multiple described radio-frequency (RF) tag to be measured is in the position of described first direction, comprising:
According to the acquisition time of the phase value obtained with this phase value, obtain multiple described radio-frequency (RF) tag phase value change profile to be measured;
The symmetry obtaining multiple described radio-frequency (RF) tag phase value change profile to be measured gathers the moment;
Symmetry according to multiple described radio-frequency (RF) tag phase value change profile to be measured gathers the moment, determines that multiple described radio-frequency (RF) tag to be measured is in the position of described first direction.
Further, according to the acquisition time of the phase value obtained with this phase value, obtain multiple described radio-frequency (RF) tag phase value change profile to be measured, comprising:
Obtain the phase value vector of multiple radio-frequency (RF) tag to be measured;
Set up the phase value vector of multiple described radio-frequency (RF) tag to be measured and the distance matrix of default template phase value vector;
Calculate the Optimum Matching path of multiple described radio-frequency (RF) tag to be measured, determine to obtain multiple described radio-frequency (RF) tag phase value change profile to be measured according to the Optimum Matching path of multiple described radio-frequency (RF) tag to be measured.
Further, at the acquisition time according to the phase value obtained and this phase value, after obtaining multiple described radio-frequency (RF) tag phase value change profile to be measured, also comprise:
Quadratic fit is carried out to multiple described radio-frequency (RF) tag phase value change profile to be measured, obtains quadratic fit model.
Further, gather the moment according to described phase value and phase value, determine that multiple described radio-frequency (RF) tag to be measured is in the position of described first direction, comprising:
Gather the moment according to the symmetry in quadratic fit model, determine that multiple described radio-frequency (RF) tag to be measured is in the position of described first direction.
Further, gather the moment according to described phase value and phase value, determine that described radio-frequency (RF) tag to be measured is in the position of described second direction, comprising:
According to multiple described radio-frequency (RF) tag phase value rate of change to be measured, determine that described radio-frequency (RF) tag to be measured is in the position of described second direction.
Further, according to multiple described radio-frequency (RF) tag phase value rate of change to be measured, determine that described radio-frequency (RF) tag to be measured is in the position of described second direction, comprising:
Phase value in multiple described radio-frequency (RF) tag phase value change profile to be measured is divided into k part, and calculates every a phase place average;
Travel through the phase value rate of change of more multiple described radio-frequency (RF) tag to be measured, determine that described radio-frequency (RF) tag to be measured is in the position of described second direction.
Further, according to multiple described radio-frequency (RF) tag phase value rate of change to be measured, determine that described radio-frequency (RF) tag to be measured is in the position of described second direction, also comprises:
Calculate the Euclidean distance between multiple radio-frequency (RF) tag to be measured, and determine that described radio-frequency (RF) tag to be measured is in the position of described second direction.
Second aspect, present invention also offers a kind of radio frequency tag location system, comprising:
Multiple radio-frequency (RF) tag to be measured, described radio-frequency (RF) tag to be measured is along described first direction and/or second direction arrangement;
Directional antenna, launches detection signal for multiple described radio-frequency (RF) tag to be measured, and can move along first direction or second direction;
Radio-frequency transmitter, for obtaining the phase value of multiple described radio-frequency (RF) tag reflected signal to be measured, and records the phase value collection moment.
The embodiment of the present invention is by obtaining the phase value of multiple radio-frequency (RF) tag reflected signal to be measured, and record the described phase value collection moment, the position that the moment determines multiple described radio-frequency (RF) tag to be measured is gathered according to described phase value and phase value, the method does not rely on any professional equipment, without the need to additionally arranging terrestrial reference label, improve the degree of accuracy of the location, position being marked with radio-frequency (RF) tag object.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, introduce doing one to the accompanying drawing used required in embodiment or description of the prior art simply below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The process flow diagram of a kind of radio-frequency (RF) tag localization method that Fig. 1 provides for the embodiment of the present invention one;
Fig. 2 is the process flow diagram of a kind of radio-frequency (RF) tag localization method that the embodiment of the present invention two provides;
The schematic diagram in the collection moment of the collection radio-frequency (RF) tag phase value to be measured that Fig. 3 provides for the embodiment of the present invention two and this phase value;
The radio-frequency (RF) tag phase value change profile schematic diagram to be measured that Fig. 4 provides for the embodiment of the present invention two;
What Fig. 5 provided for the embodiment of the present invention two carries out quadratic fit to radio-frequency (RF) tag phase value change profile to be measured, obtains quadratic fit model schematic;
The process flow diagram of the multiple radio-frequency (RF) tag phase value change profile to be measured of acquisition that Fig. 6 provides for the embodiment of the present invention three;
The process flow diagram of the localization method of a kind of radio-frequency (RF) tag that Fig. 7 provides for the embodiment of the present invention four;
The structural representation of a kind of radio frequency tag location system that Fig. 8 provides for the embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, hereinafter with reference to the accompanying drawing in the embodiment of the present invention, by embodiment, technical scheme of the present invention is described clearly and completely, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one
The process flow diagram of a kind of radio-frequency (RF) tag localization method that Fig. 1 provides for the embodiment of the present invention one, see Fig. 1, the method comprises:
Step 11, obtain the phase value of multiple radio-frequency (RF) tag reflected signal to be measured, and record described phase value and gather the moment.
Wherein, multiple radio-frequency (RF) tag to be measured is attached on object, in order to marking objects position, described radio-frequency (RF) tag to be measured can receive the detection signal that directional antenna is launched, and after receiving detection signal, launch reflected signal to radio-frequency transmitter, described reflected signal carries phase information, and phase information reflects the distance between radio-frequency (RF) tag to be measured and directional antenna.After radio-frequency transmitter extracts phase value from the reflected signal received, and record the collection moment of now phase value.
Step 12, gather according to described phase value and phase value the position that the moment determines multiple described radio-frequency (RF) tag to be measured.
In the reflected signal that radio-frequency transmitter returns according to radio-frequency (RF) tag to be measured, the temporal correlation of phase value calculates the position of radio-frequency (RF) tag to be measured.
The embodiment of the present invention is by obtaining the phase value of multiple radio-frequency (RF) tag reflected signal to be measured, and record the described phase value collection moment, the position that the moment determines multiple described radio-frequency (RF) tag to be measured is gathered according to described phase value and phase value, the method does not rely on any professional equipment, without the need to additionally arranging terrestrial reference label, improve the degree of accuracy of the location, position being marked with radio-frequency (RF) tag object.
In the present invention, multiple radio-frequency (RF) tag to be measured can along described first direction and/or second direction arrangement, and first direction can be vertical with second direction, can also between present the angle of 0-180 °, the present invention is not restricted this.Method provided by the invention can gather the moment according to described phase value and phase value, determine the multiple described position of radio-frequency (RF) tag to be measured at first direction and/or the position of second direction, below just each preferred embodiment specifically introduce.
Embodiment two
Fig. 2 is the process flow diagram of a kind of radio-frequency (RF) tag localization method that the embodiment of the present invention two provides.The embodiment of the present invention is by the reflected signal of received RF label, utilize the temporal correlation of reflected signal phase place to infer the position relationship in two-dimensional space of outgoing label, the luggage order of books sequentially and on travelling belt that such as can be applied on bookshelf carries out accurately sequence etc.
See Fig. 2, the method comprises:
Step 21, obtain the phase value of multiple radio-frequency (RF) tag reflected signal to be measured, and record described phase value and gather the moment.
Step 11 implementation procedure in this step and embodiment one is similar, and therefore not to repeat here.
Step 22, according to the phase value obtained and collection moment of this phase value, obtain multiple described radio-frequency (RF) tag phase value change profile to be measured.
Gather each radio-frequency (RF) tag to be measured phase value in the given time and gather the moment, and obtaining the change profile of each radio-frequency (RF) tag phase value to be measured with sampling instant.Phase value in radio-frequency (RF) tag reflected signal to be measured and the distance dependent of directional antenna and radio-frequency (RF) tag to be measured.The schematic diagram in the collection moment of the collection radio-frequency (RF) tag phase value to be measured that Fig. 3 provides for the embodiment of the present invention and this phase value.See Fig. 3, exemplary, the embodiment of the present invention adopts 6 radio-frequency (RF) tag, two row are arranged as along first direction, three row are arranged as, when directional antenna coordinate (x1, y2) from figure moves to (x2 along second direction, y2), time, the distance between radio-frequency (RF) tag 1 to be measured and directional antenna can first reduce rear increase.When directional antenna first direction with in two bit planes that second direction limits projected position parallel with the line of label 1 to be measured with second direction time, label to be measured 1 is minimum with the distance of directional antenna.When directional antenna is from coordinate (x1 from figure, y2) move in (x2, y2) process, label 1 to be measured, 2,3 are scanned successively, and radio-frequency transmitter can obtain radio-frequency (RF) tag 1,2 to be measured, 3, phase value, this phase value has reacted the distance relation between radio-frequency (RF) tag to be measured and directional antenna, and the minimum distance of phase value also along label to be measured and directional antenna is symmetrical.Along with the change of the spacing of radio-frequency (RF) tag to be measured and directional antenna, the phase value circulation change between 0-2 π in the radio-frequency (RF) tag reflected signal to be measured that radio-frequency transmitter obtains.When directional antenna is nearest apart from radio-frequency (RF) tag to be measured, phase place is minimum, and phase value forms " V " type profile with the change of sampling instant, and as shown in Figure 4, wherein Fig. 4 ordinate is phase value, and horizontal ordinate is sampling instant.
Step 23, the symmetry obtaining multiple described radio-frequency (RF) tag phase value to be measured change profile gather the moment.
In the collection moment corresponding to symmetric points of " V " type profile obtained in step 22, be the sampling instant that " V " type profile horizontal ordinate minimum point is corresponding, this moment be exactly directional antenna nearest with this radio-frequency (RF) tag to be measured time corresponding moment.The object of this step is that the symmetry obtaining above-mentioned all radio-frequency (RF) tag phase value change profiles to be measured gathers the moment.
Step 24, gather the moment according to the symmetry of multiple described radio-frequency (RF) tag phase value to be measured change profile, determine that multiple described radio-frequency (RF) tag to be measured is in the position of described first direction.
Gather the time sequencing in moment by the symmetry of the radio-frequency (RF) tag phase value change profile to be measured obtained in comparison step 23 to judge in the position of described first direction multiple radio-frequency (RF) tag to be measured.Such as, the label to be measured 1,2 shown in Fig. 3,3 phase value change profile symmetry gather the moment be once t1, t2, t3, and t1<t2<t3, therefore, label 1,2,3 to be measured is followed successively by label 1 to be measured in the position at described first direction, label 2 to be measured, label 3 to be measured.
The embodiment of the present invention is by the collection moment according to the phase value obtained and this phase value, obtain multiple described radio-frequency (RF) tag phase value change profile to be measured, and obtain the symmetrical collection moment according to described radio-frequency (RF) tag phase value change profile to be measured, symmetry according to multiple described radio-frequency (RF) tag phase value change profile to be measured gathers the moment, determine that multiple described radio-frequency (RF) tag to be measured is in the position of described first direction, solve in prior art and need to rely on professional equipment or additionally arrange that terrestrial reference label is to obtain the problem of radio-frequency (RF) tag position to be measured, realize the technique effect of accurately location radio-frequency (RF) tag to be measured, improve positional accuracy.
On the various embodiments described above basis, preferably, in the collection moment according to the phase value obtained and this phase value, after obtaining multiple described radio-frequency (RF) tag phase value change profile to be measured, also comprise: quadratic fit is carried out to multiple described radio-frequency (RF) tag phase value change profile to be measured, obtains quadratic fit model.Due in phase value measuring process often along with error, be reduce the impact that brings of measuring error, quadratic fit carried out to multiple described radio-frequency (RF) tag phase value change profile to be measured, obtains corresponding quadratic fit model.As shown in Figure 5, the radio-frequency (RF) tag phase value change profile multiple described to be measured obtained is carried out quadratic fit, remove noise spot, obtain quadratic fit model then, the moment is gathered according to the symmetry in quadratic fit model, determine that multiple described radio-frequency (RF) tag to be measured is in the position of described first direction, like this arrange benefit be can improve radio-frequency (RF) tag to be measured in a first direction position location accuracy.
Embodiment three
On above-described embodiment basis, the embodiment of the present invention additionally provides a kind of method obtaining multiple described radio-frequency (RF) tag phase value change profile to be measured, and Fig. 6 is the process flow diagram obtaining multiple described radio-frequency (RF) tag phase value change profile to be measured, see Fig. 6, comprising:
Step 31, obtain multiple radio-frequency (RF) tag to be measured phase value vector;
Such as, for a radio-frequency (RF) tag P to be measured, at collection moment ti, the phase value of the radio-frequency (RF) tag P to be measured obtained is pi, gathers one group of phase value in a period of time T, forms radio-frequency (RF) tag P1 phase value to be measured vector P (p1, p2 ... pi ... pn), wherein, radio-frequency (RF) tag phase value vector P (p1, p2 to be measured, pi,, pn) length be n, n be radio-frequency (RF) tag phase value collection point to be measured number.Similar, obtain the phase value vector of all radio-frequency (RF) tag to be measured.
Step 32, the phase value vector setting up multiple described radio-frequency (RF) tag to be measured and the distance matrix of default template phase value vector;
Exemplary, by default template phase value Vector Markup be Q (q1, q2 ..., qi ..., qm), wherein, default template phase value vector Q (q1, q2 ..., qi ..., qm) length be m, m for presetting template phase value collection point number.Set up the phase value vector P of radio-frequency (RF) tag to be measured and the Distance matrix D of default template phase value vector Q, wherein, D
i, j=|| p
i-q
j||, D
ijfor the i-th row jth column element value in the phase value vector P of radio-frequency (RF) tag to be measured and the Distance matrix D of default template phase value vector Q.Such as, the phase value vector P length of radio-frequency (RF) tag to be measured is 4, and presetting template phase value vector Q length is 5, and Distance matrix D is the matrix of 4 × 5, and described Distance matrix D the first row element is followed successively by p
1-q
1, p
1-q
2, p
1-q
3, p
1-q
4, p
1-q
5; Described Distance matrix D first row element is followed successively by p
1-q
1, p
2-q
1, p
3-q
1, p
4-q
1.
Step 33, calculate the Optimum Matching path of multiple described radio-frequency (RF) tag to be measured, determine to obtain multiple described radio-frequency (RF) tag phase value change profile to be measured according to the Optimum Matching path of multiple described radio-frequency (RF) tag to be measured.
Particularly, the computing formula in described Optimum Matching path is:
C
i，j＝D
i，j+min{C
i，j-1，C
i-1，j，C
i-1，j-1}
Determine that the phase value of radio-frequency (RF) tag P to be measured changes profile according to the Optimum Matching path that above-mentioned formula is determined, obtain the phase value in " V " type profile and corresponding collection moment.
The embodiment of the present invention is by setting up the phase value vector of radio-frequency (RF) tag to be measured and the distance matrix of default template phase value vector according to the phase value vector of radio-frequency (RF) tag to be measured, and calculate the Optimum Matching path of radio-frequency (RF) tag to be measured, radio-frequency (RF) tag phase value to be measured change profile is determined according to Optimum Matching path, thus the phase value got rid of outside radio-frequency (RF) tag phase value to be measured change profile, improve and follow-uply determine radio-frequency (RF) tag to be measured setting accuracy in a first direction.
Embodiment four
The process flow diagram of the localization method of a kind of radio-frequency (RF) tag that Fig. 7 provides for the embodiment of the present invention four, as shown in Figure 7, described method comprises:
Step 41, obtain the phase value of multiple radio-frequency (RF) tag reflected signal to be measured, and record described phase value and gather the moment.
Step 11 implementation procedure in this step and embodiment one is similar, and therefore not to repeat here.
Step 42, gather the moment according to described phase value and phase value, determine that described radio-frequency (RF) tag to be measured is in the position of described second direction.
Particularly, the moment is gathered according to described phase value and phase value, determine that described radio-frequency (RF) tag to be measured is in the position of described second direction, comprising: according to multiple described radio-frequency (RF) tag phase value rate of change to be measured, determine that described radio-frequency (RF) tag to be measured is in the position of described second direction.
Still see Fig. 3, for radio-frequency (RF) tag 1 to be measured and radio-frequency (RF) tag 4 to be measured, the two ordinate is identical, therefore can be directed antenna and scan simultaneously.Radio-frequency (RF) tag to be detected is larger along the distance of second direction and directional antenna, and the phase change rate of this label is larger.Because the distance of radio-frequency (RF) tag 4 to be measured and directional antenna is larger than the distance between radio-frequency (RF) tag 1 to be measured and directional antenna, when directional antenna moves, the phase change rate of radio-frequency (RF) tag 1 to be measured is less than the phase change rate of radio-frequency (RF) tag 4 to be measured.Therefore, according to multiple described radio-frequency (RF) tag phase value rate of change to be measured, determine that described radio-frequency (RF) tag to be measured is in the position of described second direction.
Further, on above-described embodiment basis, the embodiment of the present invention provides a kind of according to multiple described radio-frequency (RF) tag phase value rate of change to be measured, determines the preferred implementation of described radio-frequency (RF) tag to be measured in the position of described second direction.
Particularly, according to multiple described radio-frequency (RF) tag phase value rate of change to be measured, determine that described radio-frequency (RF) tag to be measured is in the position of described second direction, comprising:
Phase value in multiple described radio-frequency (RF) tag phase value change profile to be measured is divided into k part, and calculates every a phase place average;
Such as, the phase value length in the phase value change profile of radio-frequency (RF) tag A to be measured is 10, and namely the phase value change profile of radio-frequency (RF) tag 1 to be measured comprises 10 collection moment.10 of radio-frequency (RF) tag A to be measured acquisition phase values are divided into k part, and exemplary, k equals 5, and so every a phase value is the mean value of 2 phase values in this part, and the phase value marking i-th part is S
a,i.
Travel through the phase value rate of change of more multiple described radio-frequency (RF) tag to be measured, determine that described radio-frequency (RF) tag to be measured is in the position of described second direction.
Particularly, the phase value Vector Markup of such as, radio-frequency (RF) tag to be measured after above-mentioned equal divisional processing is A and B, and by the phase value rate of change of following formula comparison radio-frequency (RF) tag A to be measured and B:
Wherein, the phase value rate of change of O (A, B) phase value vector A and B that be radio-frequency (RF) tag to be measured judges the factor, S
a, ifor the mean value of i-th part of phase value in the phase value vector A of radio-frequency (RF) tag to be measured, S
b, ifor the mean value of i-th part of phase value in the phase value vector B of radio-frequency (RF) tag to be measured.When phase value rate of change height than radio-frequency (RF) tag B to be measured of the phase value rate of change of radio-frequency (RF) tag A to be measured, O (A, B) levels off to 0.On the contrary, when the phase value rate of change of A is less than the phase value rate of change of B, O (A, B) levels off to k.Therefore, the position of these two radio-frequency (RF) tag to be measured along second direction can be determined according to the measured value of O (A, B).
For two radio-frequency (RF) tag to be measured that each group compares, all need to utilize above-mentioned formula once to calculate.Therefore, when radio-frequency (RF) tag quantity to be measured is more, utilize above-mentioned formula to carry out the location Calculation amount of radio-frequency (RF) tag second direction position to be measured very huge.Based on this reason, on the various embodiments described above basis, the embodiment of the present invention additionally provides a kind ofly determines the position preferred implementation of radio-frequency (RF) tag to be measured along second direction, particularly, utilizes the Euclidean distance of following formulae discovery two radio-frequency (RF) tag A to be measured and B:
This formula characterizes the physical distance between two radio-frequency (RF) tag to be measured, and the physical distance between two radio-frequency (RF) tag to be measured is larger, and the distance value that this formula obtains is larger.Therefore, when there being the radio-frequency (RF) tag to be measured of N number of needs location, only need carry out more just determining the distance of this N number of radio-frequency (RF) tag to be measured along second direction for N time.
It should be noted that, according to phase value and the phase value collection moment of the radio-frequency (RF) tag each to be measured obtained, determine that multiple described radio-frequency (RF) tag to be measured is in the position of first direction, and the position of second direction can be carried out simultaneously, those skilled in the art is known, according to the needs of embody rule scene, the moment can be gathered according to the phase value of the radio-frequency (RF) tag each to be measured obtained and phase value, determine that multiple described radio-frequency (RF) tag to be measured is in the position of first direction, the moment can also be gathered according to the phase value of the radio-frequency (RF) tag each to be measured obtained and phase value, determine that multiple described radio-frequency (RF) tag to be measured is in the position of second direction, the moment can also be gathered according to the phase value of the radio-frequency (RF) tag each to be measured obtained and phase value, determine that multiple described radio-frequency (RF) tag to be measured is in the position of first direction, and the position of second direction, obtaining the position of radio-frequency (RF) tag to be measured at described first direction, and after the position of second direction, just each position of radio-frequency (RF) tag to be measured in two-dimensional space can be obtained.
Embodiment five
The structural representation of a kind of radio frequency tag location system that Fig. 8 provides for the embodiment of the present invention, see Fig. 8, described system comprises:
Multiple radio-frequency (RF) tag to be measured 51, described radio-frequency (RF) tag to be measured is along described first direction and/or second direction arrangement;
Directional antenna 52, launches detection signal for multiple described radio-frequency (RF) tag to be measured, and can move along first direction or second direction;
Radio-frequency transmitter 53, for obtaining the phase value of multiple described radio-frequency (RF) tag reflected signal to be measured, and records the phase value collection moment.
The radio-frequency (RF) tag positioning systems that the embodiment of the present invention provides can be used for the radio-frequency (RF) tag localization method that execution any embodiment of the present invention provides, and possesses corresponding functional module, realizes identical beneficial effect.
Note, above are only preferred embodiment of the present invention and institute's application technology principle.Skilled person in the art will appreciate that and the invention is not restricted to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute and can not protection scope of the present invention be departed from.Therefore, although be described in further detail invention has been by above embodiment, the present invention is not limited only to above embodiment, when not departing from the present invention's design, can also comprise other Equivalent embodiments more, and scope of the present invention is determined by appended right.
Claims (10)
1. a radio-frequency (RF) tag localization method, is characterized in that, comprising:
Obtain the phase value of multiple radio-frequency (RF) tag reflected signal to be measured, and record the described phase value collection moment;
The position that the moment determines multiple described radio-frequency (RF) tag to be measured is gathered according to described phase value and phase value.
2. localization method according to claim 1, is characterized in that, gathers the position that the moment determines multiple described radio-frequency (RF) tag to be measured, comprising according to described phase value and phase value:
Gather the moment according to described phase value and phase value, determine the multiple described position of radio-frequency (RF) tag to be measured at first direction and/or the position of second direction;
Wherein multiple described radio-frequency (RF) tag to be measured is along described first direction and/or second direction arrangement.
3. localization method according to claim 2, is characterized in that, gathers the moment, determine that multiple described radio-frequency (RF) tag to be measured is in the position of described first direction, comprising according to described phase value and phase value:
According to the acquisition time of the phase value obtained with this phase value, obtain multiple described radio-frequency (RF) tag phase value change profile to be measured;
The symmetry obtaining multiple described radio-frequency (RF) tag phase value change profile to be measured gathers the moment;
Symmetry according to multiple described radio-frequency (RF) tag phase value change profile to be measured gathers the moment, determines that multiple described radio-frequency (RF) tag to be measured is in the position of described first direction.
4. localization method according to claim 3, is characterized in that, according to the acquisition time of the phase value obtained with this phase value, obtains multiple described radio-frequency (RF) tag phase value change profile to be measured, comprising:
Obtain the phase value vector of multiple radio-frequency (RF) tag to be measured;
Set up the phase value vector of multiple described radio-frequency (RF) tag to be measured and the distance matrix of default template phase value vector;
Calculate the Optimum Matching path of multiple described radio-frequency (RF) tag to be measured, determine to obtain multiple described radio-frequency (RF) tag phase value change profile to be measured according to the Optimum Matching path of multiple described radio-frequency (RF) tag to be measured.
5. localization method according to claim 4, is characterized in that, at the acquisition time according to the phase value obtained and this phase value, after obtaining multiple described radio-frequency (RF) tag phase value change profile to be measured, also comprises:
Quadratic fit is carried out to multiple described radio-frequency (RF) tag phase value change profile to be measured, obtains quadratic fit model.
6. localization method according to claim 5, is characterized in that, gathers the moment, determine that multiple described radio-frequency (RF) tag to be measured is in the position of described first direction, comprising according to described phase value and phase value:
Gather the moment according to the symmetry in quadratic fit model, determine that multiple described radio-frequency (RF) tag to be measured is in the position of described first direction.
7. localization method according to claim 4, is characterized in that, gathers the moment, determine that described radio-frequency (RF) tag to be measured is in the position of described second direction, comprising according to described phase value and phase value:
According to multiple described radio-frequency (RF) tag phase value rate of change to be measured, determine that described radio-frequency (RF) tag to be measured is in the position of described second direction.
8. localization method according to claim 7, is characterized in that, according to multiple described radio-frequency (RF) tag phase value rate of change to be measured, determines that described radio-frequency (RF) tag to be measured is in the position of described second direction, comprising:
Phase value in multiple described radio-frequency (RF) tag phase value change profile to be measured is divided into k part, and calculates every a phase place average;
Travel through the phase value rate of change of more multiple described radio-frequency (RF) tag to be measured, determine that described radio-frequency (RF) tag to be measured is in the position of described second direction.
9. localization method according to claim 8, is characterized in that, according to multiple described radio-frequency (RF) tag phase value rate of change to be measured, determines that described radio-frequency (RF) tag to be measured is in the position of described second direction, also comprises:
Calculate the Euclidean distance between multiple radio-frequency (RF) tag to be measured, and determine that described radio-frequency (RF) tag to be measured is in the position of described second direction.
10. a radio frequency tag location system, is characterized in that, comprising:
Multiple radio-frequency (RF) tag to be measured, described radio-frequency (RF) tag to be measured is along described first direction and/or second direction arrangement;
Directional antenna, launches detection signal for multiple described radio-frequency (RF) tag to be measured, and can move along first direction or second direction;
Radio-frequency transmitter, for obtaining the phase value of multiple described radio-frequency (RF) tag reflected signal to be measured, and records the phase value collection moment.
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