CN110456303A - The positioning system of RFID label tag - Google Patents
The positioning system of RFID label tag Download PDFInfo
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- CN110456303A CN110456303A CN201810431445.3A CN201810431445A CN110456303A CN 110456303 A CN110456303 A CN 110456303A CN 201810431445 A CN201810431445 A CN 201810431445A CN 110456303 A CN110456303 A CN 110456303A
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- antenna array
- rfid label
- array element
- label tag
- phase
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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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- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
A kind of positioning system of RFID label tag, comprising: aerial array, the aerial array include: center antenna array element；Multipair perimeter antenna array element, wherein each pair of perimeter antenna array element is relative to the center antenna array element central symmetry；Phase-shift circuit receives the radiofrequency signal of input, and controls the aerial array using the wave beam of radiofrequency signal synthesis different directions according to control instruction；Reader is used to provide the described radiofrequency signal, and from the antenna array receiver feedback signal and the intensity of the determining feedback signal, the feedback signal is to be fed back by RFID label tag for the wave beam；Processing equipment for generating the control instruction, and determines according to the intensity of the feedback signal positioning of the RFID label tag.The present invention program can increase area coverage of the wave beam to RFID label tag of different directions, and the positioning of RFID label tag is determined according to the feedback signal of multiple directions, help to improve positioning accuracy.
Description
Technical field
The present invention relates to field of communication technology more particularly to a kind of positioning systems of RFID label tag.
Background technique
In existing indoor positioning technologies, radio frequency identification (Radio Frequency Identification,
RFID) extensive use has been obtained in technology, is applied especially to the industries such as logistics, supplies management, the manufacturing and assembly.
However, in the RFID label tag location technology of existing superfrequency (Ultra High Frequency, UHF) frequency range
In, directional aerial is generallyd use, haves the shortcomings that positioning accuracy is poor, area coverage is small.Specifically, directional aerial is at some
Or transmitting and reception electromagnetic wave are especially strong on certain several specific direction, and emit in other directions and receive electromagnetic wave and be then
Zero or minimum, cause the RFID label tag covered in the specified direction very few, positioning accuracy is lower.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of positioning systems of RFID label tag, can increase the wave of different directions
Beam determines according to the feedback signal of multiple directions the positioning of RFID label tag to the area coverage of RFID label tag, helps to mention
High position precision.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of positioning system of RFID label tag, comprising: antenna array
Column, the aerial array includes: center antenna array element；Multipair perimeter antenna array element, wherein each pair of perimeter antenna array element relative to
The center antenna array element central symmetry；Phase-shift circuit receives the radiofrequency signal of input, and controls the day according to control instruction
Linear array synthesizes the wave beam of different directions using the radiofrequency signal；Reader is used to provide the described radiofrequency signal, from the day
Linear array receives feedback signal and determines the intensity of the feedback signal, and the feedback signal is by RFID label tag for the wave
What beam was fed back；Processing equipment, for generating the control instruction, and according to the determination of the intensity of the feedback signal
The positioning of RFID label tag.
Optionally, the phase-shift circuit includes not equal part power splitter, delay line phase, the first numerical control phase-shifting unit, second
Numerical control phase-shifting unit, the first single pole multiple throw, the second single pole multiple throw；Wherein, the first end of the not equal part power splitter
It is connect with the reader；The second end of the not equal part power splitter respectively with the center antenna array element, delay line phase
First end and the coupling of the first end of the first numerical control phase-shifting unit；The second end of the delay line phase and second number
Control the first end coupling of phase-shifting unit；The second end of the first numerical control phase-shifting unit and first single pole multiple throw are not
Moved end connection, the second end of the second numerical control phase-shifting unit are connect with the non-moving end of second single pole multiple throw；It is described
The moved end of first single pole multiple throw is connect with a bay in each pair of perimeter antenna array element, and second hilted broadsword is thrown more
The moved end of switch is connect with another bay in each pair of perimeter antenna array element.
Optionally, the phase-shift circuit further includes double-point double-throw switch；Wherein, the first end of the double-point double-throw switch point
It is not connect with the second end of the second end of the not equal part power splitter and the delay line phase, the double-point double-throw switch
Second end is connect with the first end of the first end of the first numerical control phase-shifting unit and the second numerical control phase-shifting unit respectively.
Optionally, each perimeter antenna array element is equal with the distance between the center antenna array element.
Optionally, the multipair perimeter antenna array element is uniformly distributed.
Optionally, the total quantity of the center antenna array element and perimeter antenna array element is 2N+1, and N is positive integer.
Optionally, the center antenna array element and perimeter antenna array element are selected from: four-arm spiral antenna and low section ceramics
Antenna.
Optionally, the phase shift range of the first numerical control phase-shifting unit and the second numerical control phase-shifting unit be 0 ° extremely
180°。
Optionally, the delay line phase includes 180 ° of delay lines.
Optionally, the first numerical control phase-shifting unit is selected from the second numerical control phase-shifting unit: switching wiring phase shifter
And switch loaded type phase shifter.
Optionally, the intensity of the feedback signal of the RFID label tag is indicated with RSSI value.
Optionally, the aerial array successively sends the radiofrequency signal to multiple directions by wave beam forming.
Optionally, the processing equipment is directed to the strong of the feedback signal of the wave beam feedback of different directions to the RFID label tag
Degree is compared, to determine direction when feedback signal strength maximum, and the direction when use feedback signal strength maximum
Positioning as the RFID label tag.
Compared with prior art, the technical solution of the embodiment of the present invention has the advantages that
In embodiments of the present invention, a kind of positioning system of RFID label tag is provided, comprising: aerial array, the antenna array
Column include: center antenna array element；Multipair perimeter antenna array element, wherein each pair of perimeter antenna array element is relative to the center antenna battle array
First central symmetry；Phase-shift circuit receives the radiofrequency signal of input, and according to the control instruction control aerial array utilization
The wave beam of radiofrequency signal synthesis different directions；Reader is used to provide the described radiofrequency signal, feeds back from the antenna array receiver
Signal and the intensity for determining the feedback signal, the feedback signal are to be fed back by RFID label tag for the wave beam；
Processing equipment for generating the control instruction, and determines according to the intensity of the feedback signal positioning of the RFID label tag.
It using the above scheme, include the aerial array with multiple array elements by the positioning system that RFID label tag is arranged, and using shifting
Circuitry phase controls the wave beam of the aerial array synthesis different directions, and then the feedback of the RFID label tag is received using reader
Signal and the intensity for determining the feedback signal, can be fixed according to RFID label tag for the feedback signal of the wave beam of multiple directions
The direction of position RFID label tag.Directional aerial is used in compared with the prior art, the direction of wave beam is single and is difficult to determine RFID mark
The accurate positionin of label can increase covering surface of the wave beam to RFID label tag of different directions using the scheme of the embodiment of the present invention
It accumulates, and determines the positioning of RFID label tag according to the feedback signal of multiple directions, help to improve positioning accuracy.
Further, equal with the distance between the center antenna array element by the way that each perimeter antenna array element is arranged, and
The multipair perimeter antenna array element is uniformly distributed, and perimeter antenna array element can be made to be located at the circumference in the center antenna array element center of circle
On, help to increase calculating convenience, reduces and calculate error, further increase positioning accuracy.
Further, further include double-point double-throw switch by the way that the phase-shift circuit is arranged, can choose simultaneously or non-choosing simultaneously
In the first numerical control phase-shifting unit and the second numerical control phase-shifting unit, help to reduce due to only choosing one in the two and cause
The probability of error.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the positioning system of RFID label tag in the prior art；
Fig. 2 is a kind of structural schematic diagram of the positioning system of RFID label tag in the embodiment of the present invention；
Fig. 3 is a kind of schematic diagram of the beam direction of aerial array in the embodiment of the present invention；
Fig. 4 is the schematic illustration of a kind of aerial array and phase-shift circuit in the embodiment of the present invention；
Fig. 5 is the schematic diagram of a scenario that a kind of aerial array issues wave beam in a first direction in the embodiment of the present invention；
Fig. 6 is the schematic diagram of a scenario that a kind of aerial array issues wave beam in a second direction in the embodiment of the present invention；
Fig. 7 is the structural schematic diagram of another aerial array in the embodiment of the present invention.
Specific embodiment
In existing RFID label tag location technology, using directional aerial, that there are positioning accuracies is poor, area coverage is small is lacked
Point.
Referring to Fig.1, Fig. 1 is a kind of structural schematic diagram of the positioning system of RFID label tag in the prior art.The RFID mark
The positioning system of label may include antenna 11, reader 13 and processing equipment 14.
Wherein, the antenna 11 can be directional aerial, for sending wave beam to specific direction, if on the specific direction
There are multiple RFID label tags 15 (such as may include RFID label tag 1, RFID label tag 2 ... RFID label tag n etc.), and needle
Feedback signal is fed back to the wave beam, then the antenna 11 can receive the feedback signal and be sent to reader 13.
The reader 13 for providing radiofrequency signal, and receives from the antenna 11 and demodulates the feedback signal.
The processing equipment 14 can based on the feedback signal, and positioning the corresponding RFID label tag 15 of the feedback signal is that this is specific
Direction.
The present inventor has found after study, since directional aerial emits on some or certain several specific directions
And to receive electromagnetic wave especially strong, and emit in other directions and to receive electromagnetic wave weaker, cause antenna 11 to be only capable of in the spy
Determine to send wave beam on direction or receive the feedback signal that RFID label tag 15 is fed back, area coverage is smaller, is easy to happen leakage and asks
Topic, and since the direction of wave beam is single, leading to positioning accuracy is only the specific direction, and is difficult to the range in the specific direction
The positioning for inside more accurately determining RFID label tag 15, causes positioning accuracy lower.
In embodiments of the present invention, a kind of positioning system of RFID label tag is provided, comprising: aerial array, the antenna array
Column include: center antenna array element；Multipair perimeter antenna array element, wherein each pair of perimeter antenna array element is relative to the center antenna battle array
First central symmetry；Phase-shift circuit receives the radiofrequency signal of input, and according to the control instruction control aerial array utilization
The wave beam of radiofrequency signal synthesis different directions；Reader is used to provide the described radiofrequency signal, feeds back from the antenna array receiver
Signal and the intensity for determining the feedback signal, the feedback signal are to be fed back by RFID label tag for the wave beam；
Processing equipment for generating the control instruction, and determines according to the intensity of the feedback signal positioning of the RFID label tag.
It using the above scheme, include the aerial array with multiple array elements by the positioning system that RFID label tag is arranged, and using shifting
Circuitry phase controls the wave beam of the aerial array synthesis different directions, and then the feedback of the RFID label tag is received using reader
Signal and the intensity for determining the feedback signal, can be fixed according to RFID label tag for the feedback signal of the wave beam of multiple directions
The direction of position RFID label tag.Directional aerial is used in compared with the prior art, the direction of wave beam is single and is difficult to determine RFID mark
The accurate positionin of label can increase covering surface of the wave beam to RFID label tag of different directions using the scheme of the embodiment of the present invention
It accumulates, and determines the positioning of RFID label tag according to the feedback signal of multiple directions, help to improve positioning accuracy.
It is understandable to enable above-mentioned purpose of the invention, feature and beneficial effect to become apparent, with reference to the accompanying drawing to this
The specific embodiment of invention is described in detail.
Fig. 2 is a kind of structural schematic diagram of the positioning system of RFID label tag in the embodiment of the present invention.The RFID label tag
Positioning system may include aerial array 21, phase-shift circuit 22, reader 23 and processing equipment 24.
Wherein, the aerial array 21 may include center antenna array element 211 and multipair perimeter antenna array element, such as week
Side bay 212, perimeter antenna array element 213, perimeter antenna array element 214, perimeter antenna array element 215 etc..Wherein, each pair of periphery
Bay is relative to 211 central symmetry of center antenna array element.
Specifically, the aerial array 21 can send wave beam, if there are multiple RFID label tags 25 on beam direction
(such as may include RFID label tag 1, RFID label tag 2 ... RFID label tag n etc.), and feed back to feedback letter for the wave beam
Number, then the aerial array 21 can receive the feedback signal and be sent to reader 23.
The phase-shift circuit 22 can receive the radiofrequency signal of input, and control the aerial array 21 according to control instruction
Utilize the wave beam of radiofrequency signal synthesis different directions.
The reader 23 can be used for providing the radiofrequency signal to phase-shift circuit 22, receive from the aerial array 21
Feedback signal and the intensity for determining the feedback signal, the feedback signal are to be fed back by RFID label tag 25 for the wave beam
It arrives.
Wherein, the reader 23 can be connect by filter with low insertion loss radio-frequency cable with the phase-shift circuit 22.
The processing equipment 24 can be used for generating the control instruction, and determine institute according to the intensity of the feedback signal
State the positioning of RFID label tag 25.
Wherein, the connection type between the reader 23 and the processing equipment 24 can be selected from: network interface mode and
Serial mode.
Further, the total quantity of the center antenna array element 211 and perimeter antenna array element can be 2N+1, and N is positive whole
Number.
Specifically, since each pair of perimeter antenna array element is relative to 211 central symmetry of center antenna array element, setting
The total quantity of perimeter antenna array element is 2N, and the total quantity that the center antenna array element 211 and perimeter antenna array element is arranged is 2N+1,
Help in all directions to be configured perimeter antenna array element, realizes the aerial array in the embodiment of the present invention.
Further, the distance between each perimeter antenna array element and described center antenna array element 211 can be equal.
In embodiments of the present invention, by being arranged between each perimeter antenna array element and the center antenna array element 211
It is equidistant, helps to increase calculating convenience, reduce and calculate error, further increase positioning accuracy.
Further, the multipair perimeter antenna array element is uniformly distributed.
In embodiments of the present invention, it is uniformly distributed by the way that the multipair perimeter antenna array element is arranged, perimeter antenna can be made
Array element is located at center antenna array element 211 on the circumference in the center of circle, to facilitate to be covered using a small amount of perimeter antenna array element
More multizone.
In embodiments of the present invention, by being arranged between each perimeter antenna array element and the center antenna array element 211
It is equidistant and the multipair perimeter antenna array element is uniformly distributed, perimeter antenna array element can be made to be located at center antenna battle array
Member 211 calculates convenience on the circumference in the center of circle, to facilitate to increase, and reduces and calculates error, further increases positioning accuracy.
Fig. 2 shows a kind of preferred embodiment in, the quantity that the perimeter antenna array element can be set is 8, and adjacent
45 ° are divided between angle between two perimeter antenna array elements.
As shown in Fig. 2, the radiation sector angular of each perimeter antenna array element is 45 °, by reasonably planning perimeter antenna
The phase difference of array element and center antenna array element input signal, beam scanning range and positioning accuracy can meet wanting for indoor positioning
It asks.
Further, the center antenna array element 211 and perimeter antenna array element can be selected from: four-arm spiral antenna and low
Section ceramic antenna.
Further, the intensity of the feedback signal of the RFID label tag 25 can use the intensity instruction for receiving signal
(Received Signal Strength Indicator, RSSI) value indicates, so as to the strong of different feedback signals
Degree carries out intuitively comparing.
It should be pointed out that in embodiments of the present invention, it is common using the aerial array 21 and the phase-shift circuit 22
The antenna module 20 of formation is completed to synthesize and issue the function of wave beam, namely replaces day shown in Fig. 1 using antenna module 20
Line 11.
Preferably, the antenna module 20 can use Passive phased-array antenna, to reduce research and development complexity.
Wherein, the aerial array 21 successively can send the radiofrequency signal to multiple directions by wave beam forming.
Specifically, center antenna array element 211 can be with a pair of of perimeter antenna array element to a series of corresponding direction send waves
Beam.By taking perimeter antenna array element 212 and perimeter antenna array element 213 as an example, due to perimeter antenna array element 212 and perimeter antenna array element
213 relative to 211 central symmetry of center antenna array element, and is located at the top of the center antenna array element 211 under
Side, therefore using the wave beam of perimeter antenna array element 212, perimeter antenna array element 213 and the center antenna array element 211 sending
Direction is also up and down direction shown in dotted line frame.
Referring to Fig. 3, Fig. 3 is a kind of schematic diagram of the beam direction of aerial array in the embodiment of the present invention.The wave beam can
Think perimeter antenna array element 212 (referring to Fig. 2), perimeter antenna array element 213 (referring to Fig. 2) and the center antenna array element 211
(referring to Fig. 2) issues.
Specifically, the direction of the wave beam may include to the inclined direction A of perimeter antenna array element 212, for example including A1,
The direction A2, A3 and A4 can also include to the inclined direction B of perimeter antenna array element 213, for example including B1, B2, B3 and B4
Direction.
With continued reference to Fig. 2, it is to be understood that when using perimeter antenna array element 214, perimeter antenna array element 215 and institute
When stating the sending wave beam of center antenna array element 211, the direction of the wave beam may include to perimeter antenna array element 214 and periphery day
Linear array 215 inclined left and right directions of member.
Further, the processing equipment 24 determines determining for the RFID label tag 25 according to the intensity of the feedback signal
Position can be the intensity for the feedback signal that the processing equipment 24 feeds back the RFID label tag 25 for the wave beam of different directions
It is compared, to determine direction when feedback signal strength maximum, and the direction when feedback signal strength maximum is used to make
For the positioning of the RFID label tag 25.
It in specific implementation, can be with since the intensity of the feedback signal of the RFID label tag 25 is indicated with RSSI value
By comparing multiple RSSI values, the maximum feedback signal of RSSI value, and then the direction of the feedback signal are determined.
Further, the motion profile of the RFID label tag 25 can also be shown according to the positioning of the RFID label tag 25,
To improve the convenience of customer analysis.
It in embodiments of the present invention, include the antenna array with multiple array elements by the positioning system that RFID label tag 25 is arranged
Column 21, and the wave beam that the aerial array 21 synthesizes different directions is controlled using phase-shift circuit 22, and then use reader 23
It receives the feedback signal of the RFID label tag 25 and determines the intensity of the feedback signal, it can be according to RFID label tag 25 for more
The feedback signal of the wave beam in a direction positions the direction of RFID label tag 25.Directional aerial, wave beam are used in compared with the prior art
Direction it is single and be difficult to determine RFID label tag 25 accurate positionin difference can be increased using the scheme of the embodiment of the present invention
The wave beam in direction determines determining for RFID label tag 25 according to the feedback signal of multiple directions to the area coverage of RFID label tag 25
Position, helps to improve positioning accuracy.
Further, the phase-shift circuit 22 may include not equal part power splitter, delay line phase, the first numerical control phase shift list
Multiple circuit modules such as member, the second numerical control phase-shifting unit, the first single pole multiple throw, the second single pole multiple throw.
Referring to Fig. 4, Fig. 4 is the schematic illustration of a kind of aerial array and phase-shift circuit in the embodiment of the present invention.
Specifically, the antenna module 20 may include aerial array 21 and phase-shift circuit 22, the phase-shift circuit 22
It may include not equal part power splitter 221, delay line phase 222, the first numerical control phase-shifting unit 223, the second numerical control phase-shifting unit
224, the first single pole multiple throw 225 and the second single pole multiple throw 226.The aerial array 21 may include center antenna
Array element 211 and multipair perimeter antenna array element, the perimeter antenna array element for example may include perimeter antenna array element 212 and week
Side bay 213, wherein each pair of perimeter antenna array element is relative to 211 central symmetry of center antenna array element.
Wherein, the first end of the not equal part power splitter 221 can be connect with the reader 23 (referring to Fig. 2)；It is described
Not the second end of equal part power splitter 221 can respectively with the center antenna array element 211, the first end of delay line phase 222 with
And the first end coupling of the first numerical control phase-shifting unit 223；
The second end of the delay line phase 222 and the first end of the second numerical control phase-shifting unit 224 couple；
The second end of the first numerical control phase-shifting unit 223 is connect with the non-moving end of first single pole multiple throw 225,
The second end of the second numerical control phase-shifting unit 224 is connect with the non-moving end of second single pole multiple throw 226；
The moved end of first single pole multiple throw 225 is connect with a bay in each pair of perimeter antenna array element,
The moved end of second single pole multiple throw 226 is connect with another bay in each pair of perimeter antenna array element.
Specifically, it when the aerial array 21 and the phase-shift circuit 22 work, can mostly be thrown by the first hilted broadsword
A pair of of perimeter antenna battle array that switch 225 and the selection of the second single pole multiple throw 226 draw a straight line with center antenna array element 211
Member (such as selection perimeter antenna array element 212 and perimeter antenna array element 213), so by the first numerical control phase-shifting unit 223 with
And second numerical control phase-shifting unit 224 change center antenna array element 211, perimeter antenna array element 212 and perimeter antenna array element 213 it
Between phase difference, realize synthesis different directions wave beam.
Further, the phase-shift circuit 22 can also include double-point double-throw switch 227, the double-point double-throw switch
227 first end connects with the second end of the not equal part power splitter 221 and the second end of the delay line phase 222 respectively
Connect, the second end of the double-point double-throw switch 227 respectively with the first end of the first numerical control phase-shifting unit 223 and described
The first end of two numerical control phase-shifting units 224 connects.
It in embodiments of the present invention, further include double-point double-throw switch 227 by the way that the phase-shift circuit 22 is arranged, it can be simultaneously
It chooses or non-selected first numerical control phase-shifting unit 223 and the second numerical control phase-shifting unit 224 simultaneously, helps to reduce due to only selecting
One in middle the two and lead to the probability of error.
Further, the delay line phase 222 may include 180 ° of delay lines, so as to so that aerial array 21 synthesizes
Wave beam meet broader direction demand.
Further, the first numerical control phase-shifting unit 223 can with the phase shift range of the second numerical control phase-shifting unit 224
0 ° to 180 ° is thought, so as to so that the wave beam that aerial array 21 synthesizes meets broader direction demand.
Further, the first numerical control phase-shifting unit 223 can be used with the second numerical control phase-shifting unit 224 and be opened
It closes line style phase shifter or switch loaded type phase shifter is realized, to realize phase shift demand.
Further, first single pole multiple throw 225 can be steady using filter with low insertion loss with the second single pole multiple throw 226
Phase cable is connected with the perimeter antenna array element.
Referring to Fig. 5, Fig. 5 is the scene signal that a kind of aerial array issues wave beam in a first direction in the embodiment of the present invention
Figure.
Specifically, aerial array 21 may include center antenna array element 211, perimeter antenna array element 212 and perimeter antenna
Array element 213, perimeter antenna array element 212 and perimeter antenna array element 213 relative to 211 central symmetry of center antenna array element, and
It is located above and below the center antenna array element 211.
The wave beam that center antenna array element 211, perimeter antenna array element 212 and perimeter antenna array element 213 issue may include
Wave beam 261, wave beam 262 and wave beam 263.Wherein, direction (i.e. top) inclination of wave beam 261 to perimeter antenna array element 212, wave
Beam 262 is tilted towards center position, wave beam 263 to the direction (i.e. lower section) of perimeter antenna array element 213.
It should be pointed out that the over and under in foregoing description is all based on perimeter antenna array element 212, perimeter antenna battle array
What the relative position of member 213 and center antenna array element 211 determined, it is not exposed to the limitation of true bearing.
In embodiments of the present invention, the wave beam for the single direction that directional aerial issues compared with the prior art, due to wave beam
With more different directions, thus it is wider to the area coverage of RFID label tag 25, more RFID label tags 25 can be carried out
Positioning.
Referring to Fig. 6, Fig. 6 is the scene signal that a kind of aerial array issues wave beam in a second direction in the embodiment of the present invention
Figure.
Specifically, aerial array 21 may include center antenna array element 211, perimeter antenna array element 214 and perimeter antenna
Array element 215, perimeter antenna array element 214 and perimeter antenna array element 215 relative to 211 central symmetry of center antenna array element, and
It is located at the left and right of the center antenna array element 211.
The wave beam that center antenna array element 211, perimeter antenna array element 214 and perimeter antenna array element 215 issue may include
Wave beam 271, wave beam 272 and wave beam 273.Wherein, wave beam 271 is tilted to the direction (i.e. left) of perimeter antenna array element 214, wave
Beam 272 is tilted towards center position, wave beam 273 to the direction (i.e. right) of perimeter antenna array element 215.
It should be pointed out that the left and right in foregoing description are all based on perimeter antenna array element 214, perimeter antenna battle array
What the relative position of member 215 and center antenna array element 211 determined, it is not exposed to the limitation of true bearing.
In embodiments of the present invention, the wave beam for the single direction that directional aerial issues compared with the prior art, due to wave beam
With more different directions, thus it is wider to the area coverage of RFID label tag 25, more RFID label tags 25 can be carried out
Positioning.
It is the structural schematic diagram of another aerial array in the embodiment of the present invention referring to Fig. 7, Fig. 7.In the aerial array
In, the quantity that the perimeter antenna array element can be set is 6, and is divided between the angle between two neighboring perimeter antenna array element
60°。
Specifically, aerial array may include center antenna array element 311, perimeter antenna array element 312 and perimeter antenna battle array
Member 313, perimeter antenna array element 314 and perimeter antenna array element 315, and another pair of perimeter antenna array element.
Wherein, perimeter antenna array element 312 and perimeter antenna array element 313 are relative to 211 center of center antenna array element
Symmetrically, and be located above and below the center antenna array element 211, so as to issue upwards with inclined downward
Wave beam.
Perimeter antenna array element 214 and perimeter antenna array element 215 relative to 211 central symmetry of center antenna array element, and
It is located at the upper left side and lower right of the center antenna array element 211, so as to issue to upper left side and lower right inclination
Wave beam.
As shown in fig. 7, the radiation sector angular of each perimeter antenna array element is 60 °, by reasonably planning perimeter antenna
The phase difference of array element and center antenna array element input signal, beam scanning range and positioning accuracy can meet wanting for indoor positioning
It asks.
It is understood that the quantity of perimeter antenna array element should not be very few, the accuracy otherwise positioned can be reduced；Periphery
The quantity of bay should not be excessive, and otherwise cost can also be increase accordingly.
In embodiments of the present invention, the quantity of perimeter antenna array element can be set according to specific requirements, it is convenient to improve user
Property.
Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (13)
1. a kind of positioning system of RFID label tag characterized by comprising
Aerial array, the aerial array include:
Center antenna array element；
Multipair perimeter antenna array element, wherein each pair of perimeter antenna array element is relative to the center antenna array element central symmetry；
Phase-shift circuit is received the radiofrequency signal of input, and controls the aerial array according to control instruction and believed using the radio frequency
Number synthesis different directions wave beam；
Reader is used to provide the described radiofrequency signal, from the antenna array receiver feedback signal and determines the feedback signal
Intensity, the feedback signal is to be fed back by RFID label tag for the wave beam；
Processing equipment determines the RFID label tag for generating the control instruction, and according to the intensity of the feedback signal
Positioning.
2. the positioning system of RFID label tag according to claim 1, which is characterized in that the phase-shift circuit includes not equal part
Power splitter, delay line phase, the first numerical control phase-shifting unit, the second numerical control phase-shifting unit, the first single pole multiple throw, the second hilted broadsword
Multithrow switch；
Wherein, the first end of the not equal part power splitter is connect with the reader；
The second end of the not equal part power splitter respectively with the center antenna array element, the first end of delay line phase and described
The first end of first numerical control phase-shifting unit couples；
The second end of the delay line phase and the first end of the second numerical control phase-shifting unit couple；
The second end of the first numerical control phase-shifting unit is connect with the non-moving end of first single pole multiple throw,
The second end of the second numerical control phase-shifting unit is connect with the non-moving end of second single pole multiple throw；
The moved end of first single pole multiple throw is connect with a bay in each pair of perimeter antenna array element, and described second
The moved end of single pole multiple throw is connect with another bay in each pair of perimeter antenna array element.
3. the positioning system of RFID label tag according to claim 2, which is characterized in that the phase-shift circuit further includes double-pole
Commutator；
Wherein, the first end of the double-point double-throw switch is prolonged with the second end of the not equal part power splitter and the phase respectively
The second end connection of slow line, the second end of the double-point double-throw switch respectively with the first end of the first numerical control phase-shifting unit with
And the first end connection of the second numerical control phase-shifting unit.
4. the positioning system of RFID label tag according to claim 2, which is characterized in that each perimeter antenna array element with it is described
The distance between center antenna array element is equal.
5. the positioning system of RFID label tag according to claim 2, which is characterized in that the multipair perimeter antenna array element is equal
Even distribution.
6. the positioning system of RFID label tag according to claim 2, which is characterized in that the center antenna array element and periphery
The total quantity of bay is 2N+1, and N is positive integer.
7. the positioning system of RFID label tag according to claim 2, which is characterized in that the center antenna array element and periphery
Bay is selected from: four-arm spiral antenna and low section ceramic antenna.
8. the positioning system of RFID label tag according to claim 2, which is characterized in that the first numerical control phase-shifting unit with
The phase shift range of the second numerical control phase-shifting unit is 0 ° to 180 °.
9. the positioning system of RFID label tag according to claim 2, which is characterized in that the delay line phase includes 180 °
Delay line.
10. the positioning system of RFID label tag according to claim 2, which is characterized in that the first numerical control phase-shifting unit
It is selected from the second numerical control phase-shifting unit: switching wiring phase shifter and switch loaded type phase shifter.
11. the positioning system of RFID label tag according to claim 1, which is characterized in that the feedback letter of the RFID label tag
Number intensity indicated with RSSI value.
12. the positioning system of RFID label tag according to claim 1, which is characterized in that the aerial array passes through wave beam
Figuration successively sends the radiofrequency signal to multiple directions.
13. the positioning system of RFID label tag according to claim 1, which is characterized in that the processing equipment is to described
RFID label tag is compared for the intensity for the feedback signal that the wave beam of different directions is fed back, to determine feedback signal strength maximum
When direction, and positioning of direction when using the feedback signal strength maximum as the RFID label tag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810431445.3A CN110456303A (en) | 2018-05-08 | 2018-05-08 | The positioning system of RFID label tag |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810431445.3A CN110456303A (en) | 2018-05-08 | 2018-05-08 | The positioning system of RFID label tag |
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| CN110456303A true CN110456303A (en) | 2019-11-15 |
Family
ID=68480378
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810431445.3A Pending CN110456303A (en) | 2018-05-08 | 2018-05-08 | The positioning system of RFID label tag |
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| CN (1) | CN110456303A (en) |
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