CN108921253A - A kind of wireless location method - Google Patents
A kind of wireless location method Download PDFInfo
- Publication number
- CN108921253A CN108921253A CN201810840780.9A CN201810840780A CN108921253A CN 108921253 A CN108921253 A CN 108921253A CN 201810840780 A CN201810840780 A CN 201810840780A CN 108921253 A CN108921253 A CN 108921253A
- Authority
- CN
- China
- Prior art keywords
- rfid
- rfid tag
- read
- equipment
- positioning region
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
- G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device
- G06K17/0029—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device the arrangement being specially adapted for wireless interrogation of grouped or bundled articles tagged with wireless record carriers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
Abstract
The present invention relates to a kind of wireless location methods, and for positioning relative position of the object in plane positioning region, which is related to RFID tag array, RFID tag reads equipment and the embedded module containing location algorithm, specific method are：The RFID tag that several are previously written corresponding position coding is laid in plane positioning region and forms tag array, and the reading equipment of RFID tag is installed on the object for needing to position；When object, which is located at plane positioning region, corresponds to space, equipment is read by RFID and reads RFID tag, and the position of object in the zone is determined according to the location information of the RFID tag read.In location algorithm, RFID tag reading times and signal strength are mainly used（RSSI）As algorithm foundation, so that obtaining RFID reads relative position of the equipment relative to RFID tag.The present invention can quickly and accurately position the position of object in the zone, easy to use.
Description
Technical field
The invention belongs to wireless location technology field, apply in occasions such as new-energy automobile wireless chargings.
Background technique
Many of daily life needs the occasion positioned to the position of object in the zone.
For example, requirement of the people for the convenience of charging is also higher and higher with the fast development of new energy vehicle.Phase
The case where easy fever damages in the case where high current than the charging interface of wired charging, wireless charging interface does not have physics to connect
Touching, it is easier to realize high-power charge function.There is bigger using flexible additionally, due to wireless charging, therefore more and more
Company be added to wireless charging product design research and development.
However wireless charging also has oneself problem, one of them is exactly dispatch coil location matches problem.In general without
Work that can be relatively good within 10 centimetres of line dispatch coil position deviation will largely effect on electric energy transmission more than this distance
Efficiency.Again since in use process, for general dispatch coil in bottom of car, driver is relatively more tired when driving vehicle counterpoint
It is difficult, it is therefore desirable to have the specific position instruction of comparison.Therefore, automobile how is quickly and accurately positioned in weight charged area
In position be a problem to be solved.
Summary of the invention
The object of the present invention is to provide one kind can quickly and accurately position projected position of the object in plane domain
Method.
In order to achieve the above objectives, the technical solution adopted by the present invention is that：
A kind of wireless location method, for the positioning of projected position of the object in plane positioning region, first described flat
RFID tag is laid in face localization region makes the RFID tag constitute plane RFID array, and each RFID tag is written
It is unique position encoded, then the RFID for reading RFID tag is installed on the object of required positioning read equipment, works as institute
When stating object and being located on the plane positioning region, the RFID reads equipment and reads the RFID tag, and the RFID
Position encoded send to computing unit for reading the RFID tag that equipment is read is calculated, and is finally obtained the object and is existed
Projected position on the plane positioning region.
Position encoded RFID tag that represents of each of the plane RFID array RFID tag is described flat
The position of RFID tag described in the plane positioning region is stored in advance in relative position in the RFID array of face, the computing unit
The rule of correspondence for setting coding and relative position, according to it is position encoded calculate the object be projected in the plane positioning region
In relative position.
The RFID reads equipment and reads multiple RFID tags in its read range simultaneously, or with the side of scanning
Formula reads multiple RFID tags in its read range, and the RFID reads reading model of the equipment in the plane positioning region
It is continuous for enclosing, and the read range is less than the one third of all surrounded areas of RFID tag, and the RFID is read
Equipment is 3-20 in the RFID tag quantity that the plane positioning region can be read.
The arrangement pitch of the RFID tag is 3-20cm, and the reading/writing distance that the RFID tag reads equipment is greater than described
Maximum spacing distance between RFID tag.
The computing unit using the reading times of the same RFID tag as the first weight of the RFID tag into
The RSSI value for reading each RFID tag is carried out average computation as the second weight by row average computation, is obtained primary first
Step counts counted positional value, and the positional value that a current primary Calculation obtains and the positional value that nearest 2-10 is calculated are carried out
It is average, to obtain the positional value of this calculating.
If the positional value deviation that positional value and last time that primary Calculation obtains are calculated is in 3 adjacent RFID tags
In range, then continue calculating position.
Detailed description of the invention
Attached drawing 1 is the schematic diagram of wireless location system of the invention.
Attached drawing 2 is the distribution schematic diagram of RFID tag in the zone in wireless location system of the invention.
Specific embodiment
The invention will be further described for embodiment shown in reference to the accompanying drawing.
Embodiment：As shown in Fig. 1, a kind of for positioning the wireless fixed of projected position of the object in plane positioning region
Position system including several RFID tags, can read the RFID reading equipment of multiple RFID tags and simultaneously for realizing number
According to the computing unit of Processing Algorithm, computing unit can use embedded module, read equipment with RFID and be in communication with each other, thus
RFID can be obtained and read the information that equipment is read.Each RFID tag is laid in plane positioning region, to constitute
Plane RFID array, the arrangement pitch of RFID tag are 3-20cm, and a RFID tag is arranged in every 3-20cm in other words.This implementation
In example, plane positioning region is the primary coil physics wherein installed on ground above the ground primary coil of new-energy automobile
Having a size of 600mm*600mm, a arrangement of grid in length and breadth of 11*11 is covered in a plane on parallel ground in primary coil
RFID tag, the area of plane that plane RFID array is surrounded are 590mm*590mm, and each RFID tag center spacing is
50mm.The localization region of 750*750mm is generated after scheme implementation.RFID reads equipment and is mounted on the secondary side on new-energy automobile
Hub of a spool position, it is 20cm that RFID, which reads equipment apart from ground, and RFID, which reads equipment, has read range, and RFID reads equipment
Read range in the plane positioning region is that continuously, RFID reading equipment can read more in its read range simultaneously
A RFID tag, or multiple RFID tags in its read range are read in a manner of scanning.The reading model of RFID reading equipment
Enclose the one third less than the surrounded area of all RFID tags, RFID reading equipment plane positioning region can read
RFID tag quantity is 3-20.
In the present embodiment, plane positioning region is square, and selection uses the RFID tag of centrosymmetric image, center
The characteristic in all directions of symmetric tags also shows as central symmetry.The RFID tag ranks are evenly distributed, RFID it
Between distance be equal.RFID tag arrangement determine after, be successively written in each RFID tag it is corresponding position encoded, each
RFID's is position encoded unique, this is position encoded for characterizing its relative position in plane RFID array.In the present embodiment
In, regular number is carried out to each RFID tag, which can represent the location information of corresponding RFID tag, will generation
The number of table location information, which is written in corresponding RFID tag, can be obtained similar attached RFID tag distribution map shown in Fig. 2.
In fig 2, the corresponding number of each RFID tag is two, and first indicates that the RFID tag is expert at from left to right, from left to right the
Two indicate the RFID tag column, therefore for numbering the RFID tag for being xy, then it represents that it is located at xth row, y column.?
Coordinate system is established in localization region, then each RFID tag has its physical location of coordinate representation in the coordinate system, real
Border position is corresponding with the number of RFID tag, then can calculate the physical location of RFID tag in the following manner：RFID mark
The center spacing of label is 50mm, if the center position coordinates for the RFID tag that the number in the upper left corner is 11 are (100,100), then
The coordinate of its physical location of number is 43 RFID tag is exactly ((4-1) × 50+100, (3-1) × 50+100), i.e., (250,
200).The number of RFID tag and its physical location can be thus mapped.
In the present embodiment, the secondary coil for carrying RFID tag reading equipment is mounted on new-energy automobile bottom, works as vapour
When vehicle drives into the surface of charged area, the RFID tag in surface-mounted primary coil can be read by reading equipment,
Then read-write equipment sends the RFID data read in the embedded module of responsible position algorithm and carries out calculation processing.Scheming
In 2, each grid with character represents a RFID tag, and grey grid indicates that RFID reads the RFID that equipment is read
Label.
It is main when computing unit determines position to read different RFID marks within the set time according to RFID reading equipment
This parameter of the number of label, distance identification equipment is closer, and RFID tag is easier to be read into data, i.e., reads in the unit time
Number to RFID tag is more, then computing unit is using the reading times of the same RFID tag as the first of the RFID tag
Weight carries out average computation.Due to one position of position encoded correspondence of each RFID tag, so when the number read
When weighted value as this position carries out average computation, the weight the big, and the positional value being finally calculated is closer to the RFID
Representative position.
Further, this example utilizes RSSI value (i.e. signal value size) auxiliary judgment object of the different RFID tags read
The RSSI value for reading each RFID tag is carried out average computation as the second weight, because distance is got over by the position where body
Closely, RSSI value is bigger.Therefore can according to the size of the RSSI value of each RFID tag read, come determine identification equipment away from
Relative distance from the RFID tag.Such as in fig 2, it is read if the RSSI value for reading the RFID tag that number is 37 is less than
Get the RSSI value for the RFID tag that number is 57, then it represents that in the RFID tag that number is 37 and 57, identify device location
On closer to number be 57 RFID tag.In position algorithm, using RSSI and the difference of setting biasing as the weight of data
It is averaged.
To, it is calculated using the number read above to RFID tag and the RSSI value for reading each RFID tag,
The positional value that an available primary Calculation obtains.Then a positional value and nearest 2-10 current primary Calculation obtained calculates
Obtained positional value is averaged, to obtain the positional value of this calculating.In calculating process, if the position that primary Calculation obtains
Value and the last positional value deviation being calculated then continue calculating position, otherwise within the scope of 3 adjacent RFID tags
The positional value that primary Calculation is obtained is adjusted to and the last positional value deviation being calculated is in 3 adjacent RFID tags
In range.
It is as follows that algorithm above states formula as：
Identify the position coordinates of equipment
Wherein, Px (i), Py (i) are respectively the actual coordinate of i-th of the RFID tag read, and Rssi (i) is according to reading
Taking number is the weight of i-th of RFID tag setting, and n is the total degree for reading each RFID tag, can usually be taken between 20-50
Numerical value.
Wherein in relation to Rssi (i) weight computing formula：Rssi (i)=Offset+RSSI, wherein RSSI is to read
The characterization of the signal strength or weakness of RFID tag, the numerical value of actual use are about the numerical value between -80 to -30 (dBm), and Offset is to make
The bias that Rssi (i) is positive, general value range is between 80-200.
In addition to this, recently received position data and current location are compared, if the positional number received
According to and current location deviation be greater than k RFID tag size when, the position data received is revised as k RFID tag size
Interior (wherein floating number of the k value between 1-3).The positional value that is finally calculated and preceding obtained positional value several times again into
Row is average, finally obtains the position numerical value of this positioning.
In this example, since wireless charging uses 85kHz frequency, in order to avoid signal is interfered, therefore use
The RFID read-write equipment of 900MHz frequency range.
The read range of plane, needs to adjust RFID read-write as where needing to control RFID read-write equipment in RFID tag
The transmission power and the direction of the launch of equipment, to ensure that read range meets the requirements.
Since general electric car Wireless charging coil allows 10 centimetres of the upper deviation or more in the horizontal direction, in 10 centimetres of models
The efficiency that can ensure that wirelessly transmitting electrical energy is enclosed, and the positioning accuracy of this programme is thus particularly suited for electric car up to Centimeter Level
Wireless charging this scene.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all according to the present invention
Equivalent change or modification made by Spirit Essence, should be covered by the protection scope of the present invention.
Claims (6)
1. a kind of wireless location method, the positioning for projected position of the object in plane positioning region, it is characterised in that：First
Laying RFID tag in the plane positioning region makes the RFID tag constitute plane RFID array, and to each RFID
Label write-in is unique position encoded, and the RFID reading for reading RFID tag is then installed on the object of required positioning and is set
Standby, when the object is located on the plane positioning region, the RFID reads equipment and reads the RFID tag, and institute
Position encoded send to computing unit for stating the RFID tag that RFID reading equipment is read is calculated, and is finally obtained described
Projected position of the object on the plane positioning region.
2. wireless location method according to claim 1, it is characterised in that：Each of described plane RFID array is described
The position encoded relative position for representing the RFID tag in the plane RFID array of RFID tag, the computing unit are pre-
The rule of correspondence for first storing the position encoded and relative position of RFID tag described in the plane positioning region, is compiled according to position
Code calculates the relative position of the object being projected in the plane positioning region.
3. wireless location method according to claim 1, it is characterised in that：The RFID reads equipment and reads it simultaneously
Multiple RFID tags in read range, or multiple RFID tags in its read range are read in a manner of scanning, it is described
RFID read read range of the equipment in the plane positioning region be it is continuous, the read range is less than all described
The one third of the surrounded area of RFID tag, the RFID read the institute that equipment can be read in the plane positioning region
Stating RFID tag quantity is 3-20.
4. wireless location method according to claim 1, it is characterised in that：The arrangement pitch of the RFID tag is 3-
20cm, the reading/writing distance that the RFID tag reads equipment are greater than maximum spacing distance between the RFID tag.
5. wireless location method according to claim 1, it is characterised in that：The computing unit is by the same RFID
The reading times of label carry out average computation as the first weight of the RFID tag, will read each RFID tag
RSSI value carries out average computation as the second weight, obtains the positional value that a primary Calculation obtains, and will currently primary preliminary meter
The positional value that counted positional value and nearest 2-10 are calculated is averaged, to obtain the positional value of this calculating.
6. wireless location method according to claim 5, it is characterised in that：If the positional value that primary Calculation obtains and last time
The positional value deviation being calculated then continues calculating position within the scope of 3 adjacent RFID tags.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810840780.9A CN108921253B (en) | 2018-07-27 | 2018-07-27 | Wireless positioning method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810840780.9A CN108921253B (en) | 2018-07-27 | 2018-07-27 | Wireless positioning method |
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| CN108921253A true CN108921253A (en) | 2018-11-30 |
| CN108921253B CN108921253B (en) | 2022-02-25 |
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| CN201810840780.9A Active CN108921253B (en) | 2018-07-27 | 2018-07-27 | Wireless positioning method |
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| CN113077024A (en) * | 2021-05-07 | 2021-07-06 | 重庆品胜科技有限公司 | RFID label reading and writing method and system of RFID printer |
| CN113357866A (en) * | 2020-03-06 | 2021-09-07 | 海信（山东）冰箱有限公司 | Food material management method for refrigerator and refrigerator |
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| CN108921253B (en) | 2022-02-25 |
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