CN109932709A - RFID location system and localization method - Google Patents
RFID location system and localization method Download PDFInfo
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- CN109932709A CN109932709A CN201910286125.8A CN201910286125A CN109932709A CN 109932709 A CN109932709 A CN 109932709A CN 201910286125 A CN201910286125 A CN 201910286125A CN 109932709 A CN109932709 A CN 109932709A
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Abstract
The embodiment of the invention discloses a kind of RFID location system and localization methods, are related to radio frequency field of locating technology, which includes: four aerial arrays, are used to form two antennas pair；RFID label tag；Control module, emit radiofrequency signal for controlling an aerial array, and two antennas are controlled to the two pairs of back-scattered signals received Jing Guo RFID label tag, two phase differences are obtained according to two pairs of back-scattered signals, and then RFID label tag is positioned according to the frequency of back-scattered signal and phase difference, default n value；N is integer.The present invention has the advantage that the frequency of phase difference and reverse phase scattered signal based on two pairs of aerial arrays obtains two range differences according to preset formula correspondence compared with the existing technology, and then RFID positioning can be carried out according to optimization algorithm and the principle of Minimum sliding distance, and greatly promote the accuracy of RFID positioning.
Description
Technical field
The present embodiments relate to radio frequency field of locating technology, and in particular to a kind of RFID location system and localization method.
Background technique
Radio frequency identification (RFID) is a kind of contactless automatic identification technology.Orientation management is considered as that less radio-frequency is known
A kind of important development direction of other technology.RFID label tag has that small in size, read-write range is wide, the service life is long, strong antijamming capability etc.
Feature.But positioning accuracy is low when being positioned in the related technology using RFID, can not be applied to the three-dimensional of the human organs such as heart
Mapping.
Summary of the invention
For this purpose, the embodiment of the present invention provides a kind of RFID location system and localization method, with solve in the prior art due to
The low problem of positioning accuracy caused by existing RFID positioning method.RFID label tag can integrate on heart intervention catheter, into
Row cardiac three-dimensional mapping.
To achieve the goals above, the embodiment of the present invention provides the following technical solutions:
A kind of RFID location system is provided according to a first aspect of the embodiments of the present invention, comprising: four aerial arrays are used
In two antennas pair of formation；RFID label tag；Control module, for controlling the hair of an aerial array in four aerial arrays
Radiofrequency signal is penetrated, and controls described two antennas to the two pairs of back-scattered signals received Jing Guo the RFID label tag, Jin Ergen
Two phase differences are obtained according to two pairs of back-scattered signals, and then according to the frequency of the back-scattered signal and described two
Phase difference, default n value position the RFID label tag；Wherein, n is integer.
Further, the control module is further used for obtaining the phase of described two antennas pair according to the following formula
Difference:
Wherein, Δ dijIndicate that the range difference of aerial array i and aerial array j and the RFID label tag, λ indicate reverse phase scattering
The wavelength and λ=c/f, c of signal indicate that the light velocity, f indicate the frequency of reverse phase scattered signal, and Δ φ indicates aerial array i and antenna
The phase difference of array j.
Further, the control module is further used for encoding the unique pseudo-noise code of the RFID label tag, with
Identify the back-scattered signal.
Further, 0,1,2,3,4 or 5 n.
A kind of positioning including above-described embodiment RFID location system is provided according to a second aspect of the embodiments of the present invention
Method, comprising the following steps: one aerial array of control emits radiofrequency signal；Described two antennas are controlled to described in reception process
Two pairs of back-scattered signals of RFID label tag；Two phase differences are obtained according to two pairs of back-scattered signals；According to described anti-
The RFID label tag is positioned to the frequency of scattered signal, described two phase differences, default n value.
Further, the phase difference of described two antennas pair is obtained according to the following formula:
Wherein, Δ dijIndicate that the range difference of aerial array i and aerial array j and the RFID label tag, λ indicate reverse phase scattering
The wavelength and λ=c/f, c of signal indicate that the light velocity, f indicate the frequency of reverse phase scattered signal, and Δ φ indicates aerial array i and antenna
The phase difference of array j.
Further, two pairs of backscattering letter Jing Guo the RFID label tag is received in the described two wire pairs of control
Before number, further includes: encode the unique pseudo-noise code of the RFID label tag.
Further, 0,1,2,3,4 or 5 n.
The embodiment of the present invention has the advantages that
The frequency of phase difference and reverse phase scattered signal based on two pairs of aerial arrays obtains two according to preset formula correspondence
Range difference, and then RFID positioning can be carried out according to optimization algorithm and the principle of Minimum sliding distance, and greatly promoted
The accuracy of RFID positioning, can integrate on heart intervention catheter, carry out cardiac three-dimensional mapping.In addition, RFID of the invention
Positioning system and localization method can be applied to the three-dimensional mapping of target object, to assist related personnel to carry out relevant work.
Detailed description of the invention
It, below will be to embodiment party in order to illustrate more clearly of embodiments of the present invention or technical solution in the prior art
Formula or attached drawing needed to be used in the description of the prior art are briefly described.It should be evident that the accompanying drawings in the following description is only
It is merely exemplary, it for those of ordinary skill in the art, without creative efforts, can also basis
The attached drawing of offer, which is extended, obtains other implementation attached drawings.
Structure depicted in this specification, ratio, size etc., only to cooperate the revealed content of specification, for
Those skilled in the art understands and reads, and is not intended to limit the invention enforceable qualifications, therefore does not have technical
Essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size are not influencing the function of the invention that can be generated
Under effect and the purpose that can reach, should all still it fall in the range of disclosed technology contents obtain and can cover.
Fig. 1 is the structural block diagram of RFID location system of the embodiment of the present invention；
Fig. 2 is two antennas of RFID location system of the embodiment of the present invention to the schematic diagram for receiving RFID back-scattered signal；
Fig. 3 is the signal for calculating angle of arrival in RFID location system of the embodiment of the present invention using the phase difference between antenna
Figure；
Fig. 4 is the flow chart of localization method of the embodiment of the present invention.
Specific embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book is understood other advantages and efficacy of the present invention easily, it is clear that described embodiment is the present invention one
Section Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
Fig. 1 is the structural block diagram of RFID location system of the embodiment of the present invention.As shown in Figure 1, the RFID of the embodiment of the present invention
Positioning system, including four aerial arrays, RFID label tag and control module.
Wherein, four aerial arrays are used to form two antennas pair.In one embodiment of the invention, by four antennas
Array is divided into two groups of formation, two wire pairs.
RFID label tag.In one embodiment of the invention, control module is by RFID label tag with unique pseudo-noise code (PN
Code) coding, tag backscatter signal and remaining signaling zone received by antenna are separated.Wherein, code is in label coding
It is created on device, it is connected to the electric current of the PIN diode of label antenna and changes the impedance of label antenna by modulating.
Control module is used to control the aerial array transmitting radiofrequency signal in four aerial arrays, and controls two days
Line obtains two phases according to two pairs of back-scattered signals to the two pairs of back-scattered signals received Jing Guo RFID label tag
Difference, and then RFID label tag is positioned according to two phase differences, the frequency of back-scattered signal, default n value.Wherein, n is whole
Number.
Fig. 2 is two antennas of RFID location system of the embodiment of the present invention to the schematic diagram for receiving RFID back-scattered signal.
As shown in Fig. 2, in one embodiment of the invention, control aerial array 1 emits assigned frequency radiofrequency signal, radiofrequency signal warp
Reverse phase scattering is carried out when crossing RFID label tag, is connect respectively by aerial array 1, aerial array 2, array antenna array 3 and aerial array 4
Receive back-scattered signal.Wherein it is possible to set aerial array 1 and aerial array 2 as an antenna pair, aerial array 3 and antenna
Array 4 is an antenna pair, can also set aerial array 1 and aerial array 3 is an antenna pair, aerial array 2 and antenna
Array 4 is an antenna pair.
In embodiments of the present invention, RFID location system is used for transmission and is received from label using single base antenna
Radiofrequency signal.Antenna issue and RFID label tag backscattering be spherical wave propagate, so the distance between label and antenna with
Receiving phase is proportional, meets following formula:
Wherein, d indicates distance from RFID label tag to some aerial array, λ indicate the wavelength of reverse phase scattered signal and λ=
C/f, c indicate that the light velocity, f indicate the frequency of reverse phase scattered signal, and φ indicates the receiving phase of some antenna, and due to phase
Cyclically-varying, n are integers.If RFID label tag removes half-wavelength from antenna, received phase will change 2 π.
Each aerial array passes through the back-scattered signal available one corresponding back-scattered signal received
Phase, such as realize that phase is the angle that I and Q are formed in phase circle of position by using IQ demodulator.It is changeable using transceiver
All four antennas simultaneously as above calculate corresponding phase.
Fig. 3 is the signal for calculating angle of arrival in RFID location system of the embodiment of the present invention using the phase difference between antenna
Figure.As shown in figure 3, in one embodiment of the invention, control module is further used for obtaining two days according to the following formula
The phase difference of line pair:
Wherein, Δ dijIndicate that the range difference of aerial array i and aerial array j and RFID label tag, λ indicate reverse phase scattered signal
Wavelength and λ=c/f, c indicate the light velocity, f indicate reverse phase scattered signal frequency, Δ φ indicate aerial array i and aerial array j
Phase difference.
The distance between RFID label tag and two antennas difference can be used for finding the direction of arrival of 2D positioning, need level
Two separate antennas in two separate antennas and vertical (elevation angle) plane in (azimuth).
Wherein, ∠ Azimuth indicates azimuth, and ∠ Elevation indicates the elevation angle, and Antenna Spacing indicates antenna
Spacing, Δ d13It is slave label for azimuthal angle calculation to the difference of the distance of antenna 1 and antenna 3, Δ d24It is to be calculated for the elevation angle
Array in the distance away from label to antenna 2 and antenna 4 difference.
If the ensuring that Δ d13With Δ d24Less than quarter-wave, then the phase difference in equation (2) will be changed to only from-π
+π。
When RFID label tag is located at origin, transceiver is calibrated to report the zero phase from all four antennas.If
RFID label tag begins around origin (x0, y0, z0) movement, then label can be calculated based on the phase value of report to each antenna
Accurate distance is without fuzzy.Using Gauss-Newton method, to provide (x to antenna distance based on four labelsi, yi, zi)
Tag coordinate.Under normal circumstances, for every group of phase value, due to phase ambiguity, being based on unknown integer, there are multiple labels
To antenna distance.Assuming that label starts no phase ambiguity near origin, (x is calculatedi, yi, zi).For each subsequent calculating,
Using multiple integer values, (most n=5, i.e. n are 0,1,2,3,4 or 5) calculate (xi, yi, zi), and five substitution solutions
In selected (xi, yi, zi) it is that (x, the y, z) that is previously calculated for providing minimum range.Assuming that interval time is 20ms,
RFID label tag is in (x twicei, yi, zi) and (xi+1, yi+1, zi+1) movement speed between calculating is no more than half-wavelength.
Communication between transceiver and host is shown as serial COM port by RS232/USB adapter in host.
The RFID location system of the embodiment of the present invention, the frequency of phase difference and reverse phase scattered signal based on two pairs of aerial arrays
Rate obtains two range differences according to preset formula correspondence, and then can according to the principle of concentric circles intersection theory and Minimum sliding distance
To carry out RFID positioning, and greatly promote the accuracy of RFID positioning.
Fig. 4 is the flow chart of localization method of the embodiment of the present invention.As shown in figure 4, the localization method of the embodiment of the present invention, packet
Include the RFID location system of above-described embodiment, the localization method the following steps are included:
S1: one aerial array of control emits radiofrequency signal；
S2: two antennas of control are to the two pairs of back-scattered signals received Jing Guo RFID label tag；
S3: two phase differences are obtained according to two pairs of back-scattered signals；
S4: RFID label tag is positioned according to two phase differences, the frequency of back-scattered signal, default n value.
The frequency of the localization method of the embodiment of the present invention, phase difference and reverse phase scattered signal based on two pairs of aerial arrays is pressed
Two range differences are obtained according to preset formula is corresponding, and then can be into according to concentric circles intersection theory and the principle of Minimum sliding distance
Row RFID positioning, and greatly promote the accuracy of RFID positioning.
In one embodiment of the invention, the phase difference of two antennas pair is obtained according to the following formula:
Wherein, Δ dijIndicate that the range difference of aerial array i and aerial array j and RFID label tag, λ indicate reverse phase scattered signal
Wavelength and λ=c/f, c indicate the light velocity, f indicate reverse phase scattered signal frequency, Δ φ indicate aerial array i and aerial array j
Phase difference.
In one embodiment of the invention, two pairs of backscattering Jing Guo RFID label tag are received in two wire pairs of control
Before signal, further includes: encode the unique pseudo-noise code of RFID label tag.
In one embodiment of the invention, 0,1,2,3,4 or 5 n.
It should be noted that the specific embodiment of the localization method of the embodiment of the present invention and the RFID of the embodiment of the present invention
The specific embodiment of positioning system is similar, referring specifically to the description of RFID location system part, in order to reduce redundancy, does not do superfluous
It states.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
Although above having used general explanation and specific embodiment, the present invention is described in detail, at this
On the basis of invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore,
These modifications or improvements without departing from theon the basis of the spirit of the present invention are fallen within the scope of the claimed invention.
Claims (8)
1. a kind of RFID location system characterized by comprising
Four aerial arrays are used to form two antennas pair；
RFID label tag；
Control module, for controlling the transmitting radiofrequency signal of an aerial array in four aerial arrays, and described in control
Two pair back-scattered signals of two antennas to reception Jing Guo the RFID label tag, and then according to two pairs of back-scattered signals
Two phase differences are obtained, and then according to the frequency of the back-scattered signal and described two phase differences, default n value to described
RFID label tag is positioned；
Wherein, n is integer.
2. RFID location system according to claim 1, which is characterized in that the control module be further used for according to
Lower formula obtains the phase difference of described two antennas pair:
Wherein, Δ dijIndicate that the range difference of aerial array i and aerial array j and the RFID label tag, λ indicate reverse phase scattered signal
Wavelength and λ=c/f, c indicate the light velocity, f indicate reverse phase scattered signal frequency, Δ φ indicate aerial array i and aerial array j
Phase difference.
3. RFID location system according to claim 1, which is characterized in that the control module is further used for will be described
RFID label tag is encoded with unique pseudo-noise code, to identify the back-scattered signal.
4. RFID location system according to claim 1, which is characterized in that n 0,1,2,3,4 or 5.
5. a kind of localization method including RFID location system described in claim 1, which comprises the following steps:
Control an aerial array transmitting radiofrequency signal；
Described two antennas are controlled to the two pairs of back-scattered signals received Jing Guo the RFID label tag；
Two phase differences are obtained according to two pairs of back-scattered signals；
The RFID label tag is positioned according to the frequency of the back-scattered signal, described two phase differences, default n value.
6. localization method according to claim 5, which is characterized in that obtain described two antennas pair according to the following formula
Phase difference:
Wherein, Δ dijIndicate that the range difference of aerial array i and aerial array j and the RFID label tag, λ indicate reverse phase scattered signal
Wavelength and λ=c/f, c indicate the light velocity, f indicate reverse phase scattered signal frequency, Δ φ indicate aerial array i and aerial array j
Phase difference.
7. localization method according to claim 5, which is characterized in that receive and pass through in the described two wire pairs of control
Before two pairs of back-scattered signals of the RFID label tag, further includes:
The unique pseudo-noise code of the RFID label tag is encoded.
8. localization method according to claim 5, which is characterized in that n 0,1,2,3,4 or 5.
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| CN116600383A (en) * | 2023-07-13 | 2023-08-15 | 杭州晟珈智能科技有限公司 | Multi-antenna RFID tag positioning method and system based on phase difference |
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