CN208155250U - A kind of chipless RFID range-measurement system based on principle of interference - Google Patents
A kind of chipless RFID range-measurement system based on principle of interference Download PDFInfo
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- CN208155250U CN208155250U CN201820616611.2U CN201820616611U CN208155250U CN 208155250 U CN208155250 U CN 208155250U CN 201820616611 U CN201820616611 U CN 201820616611U CN 208155250 U CN208155250 U CN 208155250U
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- antenna
- reference planes
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- chipless rfid
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Abstract
The chipless RFID range-measurement system based on principle of interference that the utility model discloses a kind of, it is characterized in that, including reference planes, object to be measured, reader and reader antenna, the object to be measured is chipless RFID label, the object to be measured and reference planes are in the same side of reader, the reader antenna uses vivaldi antenna, the reference planes are arranged in the greatest irradiation direction of vivaldi antenna, and the normal orientation of reference planes is parallel with the greatest irradiation direction of vivaldi antenna.The utility model precision is high, and stability is good, reduces the step of calibration postpones as caused by antenna structure and reader structure.Excitation signal waveforms are relied on less.
Description
Technical field
The utility model designs internet of things field, and in particular to a kind of chipless RFID ranging system based on principle of interference
System.
Background technique
Radio frequency identification (RFID) is a kind of wireless communication technique, is marked by electromagnetic wave signal to the RFID being attached on object
Label are detected and are identified.The advantages of RFID, is that being able to achieve non line of sight (Non Line of Sight) reads, automatic identification,
The functions such as object positioning.Traditional label is made of antenna and Integrated circuit IC (Integrated Circuit) two parts, by
In integrated circuit, the cost is relatively high, thus traditional RFID tag still can not replace optical bar code.In order to reduce RFID
The cost of label, substituting traditional RFID using chipless RFID label (Chipless RFID Tag) is feasible method.Nothing
Chip RFID tag can be divided into the label based on Frequency Domain Coding and time domain coding.Chipless RFID label mentioned in this article
Each mean the chipless RFID label based on Frequency Domain Coding.Chipless RFID label can be applied equally to position, but centreless
Piece RFID tag does not have battery power supply, and therefore, most of traditional RFID rangings, positioning system are not all suitable for chipless RFID
Ranging, positioning, so needing special design ranging, localization method.It is general to pass through measurement electromagnetic echoes due to there is no battery power supply
The time interval ranging of signal.Using multiple Node readers to chipless RFID label ranging, it may be determined that the two dimension of label, three
Tie up information.One good range-measurement system plays the role of chipless RFID tag location vital.
Currently, being mainly the following for chipless RFID tag location system.1,RTOF(Round Trip Time
Of Flight), the pulse by measuring aerial radiation reaches chipless RFID label and returns again to the time of antenna to calculate label
To the distance of antenna.The disadvantage is that needing stable pulse shape, needs to know the accurate initial time of pulse, each frequency is needed to exist
The all relatively uniform antenna of gain in reading area.2,NFMPM(Narrow-Frequency Matrix Pencil
Method), it is the method further increased to RTOF method, can more accurately confirms the arrival time of pulse, does not need each
Frequency all relatively uniform antenna of gain in reading area, but this method is higher to the phase requirements of pulse.3,RSS
(Received Signal Strength) is received the intensity of signal by measurement, determines the distance of label.The disadvantage is that with away from
From increase, precision can be lower and lower, and can cause larger shadow to the intensity of backscatter signal when label rotates by a certain angle
It rings.
Utility model content
In order to overcome shortcoming and deficiency of the existing technology, the utility model provides a kind of centreless based on principle of interference
Piece RFID range-measurement system.
The utility model adopts the following technical solution：
A kind of chipless RFID range-measurement system based on principle of interference, including reference planes, object to be measured, reader and read
Device antenna is read, the object to be measured is chipless RFID label, the object to be measured and reference planes in the same side of reader,
The reader antenna uses vivaldi antenna, and the reference planes are arranged in the greatest irradiation direction of vivaldi antenna,
The normal orientation of reference planes is parallel with the greatest irradiation direction of vivaldi antenna.
The position of Rmax/2 is arranged in the maximum reading distance Rmax of reader and reader antenna, reference planes.
The size of the reference planes and object to be measured are in the same size, are used using conductive material and chipless RFID label
Material is consistent.
The beneficial effects of the utility model：
The reference planes that the present invention preestablishes measure object to be measured using principle of interference and refer to mesh as reference position
Mark the range difference of antenna, so obtain object to be measured to antenna distance.Reduce calibration due to antenna structure and reader
The step of postponing caused by structure.Excitation signal waveforms are relied on less.
This system range accuracy is high, and stability is good.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.
Specific embodiment
Below with reference to examples and drawings, the utility model is described in further detail, but the reality of the utility model
It is without being limited thereto to apply mode.
Embodiment
As shown in Figure 1, a kind of chipless RFID range-measurement system based on principle of interference, including reference planes 1, object to be measured
2, reader and reader antenna 3, the object to be measured are chipless RFID labels, and the reference planes are by the chipless
The plane that the similar conductive material of conductor material or property used in RFID tag is constituted.
The reader antenna is broad-band antenna, specially vivaldi antenna, and it is super that the reader is that one kind can produce
Wideband pulse signal receives ultra-broadband signal, there is the reader of certain signal handling capacity.
The reference planes are arranged in the greatest irradiation direction of vivaldi antenna, the normal orientation of reference planes with
The greatest irradiation direction of vivaldi antenna is parallel.
In the present embodiment, the reference planes are the good conductor of size 40mm × 40mm.Without loss of generality, it is risen to be simple
See, the chipless RFID label is replaced using the good conductor of 40mm × 40mm.
The course of work of the utility model：
Reader generate ultra-wideband pulse, be radiated in space by ultra-wideband antenna, electromagnetic wave in space with reference
Plane and label to be measured, which meet, generates back wave, and tag reflection frequency-region signal to be measured includes tactic pattern signal and antenna mode
Signal, wherein label antenna mode signal is similar to the signal that reference planes reflect, therefore uses the antenna mode of label to be measured
Signal and the signal of reference planes reflection carry out ranging.
In the present embodiment, when the distances of reference planes to antenna be greater than label to antenna apart from when, setting actual range
L1=442.5mm, L2=216.9mm calculate distance 214.5；Antenna is arrived when the distance of reference planes to antenna is less than label
Actual range L1=442.5mm, L2=578.2mm is arranged in distance, calculates distance 575.5mm.
Above-described embodiment is the preferable embodiment of the utility model, but the embodiments of the present invention is not by described
The limitation of embodiment, it is made under other any spiritual essence and principles without departing from the utility model to change, modify, replacing
In generation, simplifies combination, should be equivalent substitute mode, is included within the protection scope of the utility model.
Claims (3)
1. a kind of chipless RFID range-measurement system based on principle of interference, which is characterized in that including reference planes, object to be measured,
Reader and reader antenna, the object to be measured are chipless RFID label, and the object to be measured and reference planes are being read
The same side of device, the reader antenna use vivaldi antenna, and the maximum of vivaldi antenna is arranged in the reference planes
In radiation direction, the normal orientation of reference planes is parallel with the greatest irradiation direction of vivaldi antenna.
2. chipless RFID range-measurement system according to claim 1, which is characterized in that reader and reader antenna are most
The position of Rmax/2 is arranged in big reading distance Rmax, reference planes.
3. chipless RFID range-measurement system according to claim 1, which is characterized in that the size of the reference planes with to
It is consistent to survey target sizes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820616611.2U CN208155250U (en) | 2018-04-26 | 2018-04-26 | A kind of chipless RFID range-measurement system based on principle of interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820616611.2U CN208155250U (en) | 2018-04-26 | 2018-04-26 | A kind of chipless RFID range-measurement system based on principle of interference |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208155250U true CN208155250U (en) | 2018-11-27 |
Family
ID=64375475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820616611.2U Expired - Fee Related CN208155250U (en) | 2018-04-26 | 2018-04-26 | A kind of chipless RFID range-measurement system based on principle of interference |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208155250U (en) |
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2018
- 2018-04-26 CN CN201820616611.2U patent/CN208155250U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181127 Termination date: 20190426 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |