CN103824039B - RFID accurate positioning method - Google Patents
RFID accurate positioning method Download PDFInfo
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- CN103824039B CN103824039B CN201410074907.2A CN201410074907A CN103824039B CN 103824039 B CN103824039 B CN 103824039B CN 201410074907 A CN201410074907 A CN 201410074907A CN 103824039 B CN103824039 B CN 103824039B
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- main website
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Abstract
The present invention relates to RFID accurate positioning method, send the radiofrequency signal including fixed transmission angle including reader；Electronic tag receives the signal that reader sends, and detects RSSI, and the RSSI value in described fixed transmission angular regions is more than the RSSI value outside this region；Setting RSSI value, when the RSSI value that electronic tag detects is more than setting value, count value adds one, and when no more than setting value, count value resets；Pre-set count values, when the count value detected is equal to pre-set count values, it is judged that position successfully.The present invention is by detection RSSI value and count value, and uses master-slave communication mode, it is ensured that the accuracy of location；Use the working method of frequency hopping, improve interference free performance；Also use main website to send request, slave station sends the mode of response, it is to avoid the multiple location phenomenon with the packet loss that communicates.
Description
Technical field
The present invention relates to a kind of RFID localization method.
Background technology
RFID (Radio Frequency IDentification) i.e. REID, is also called
Electronic tag or wireless, is a kind of communication technology, can by radio signal identification specific objective also
Read-write related data, it is not necessary to identify and set up machinery or optical contact between system and specific objective.RFID
Applicable field is quite varied, including train positioning field.Existing RFID location technology be
Arranging electronic tag in certain area, arrange reader in the target of location, reader passes through antenna
To air-launched RFID id signal, the RFID id signal sent due to reader is along with distance
Increase progressively decay according to certain rule, and the letter that electronic tag receives in moving process
Number intensity (RSSI) is different, therefore can position according to the position of electronic tag and RSSI size.
But, current above-mentioned RFID location technology not only precision is inadequate, anti-interference is strong, and exists logical
Letter packet loss, the phenomenon of resetting.
Summary of the invention
For above-mentioned technical problem, the present invention provides a kind of RFID accurate positioning method, and the method is not
Only capacity of resisting disturbance is relatively strong, and can avoid resetting and the phenomenon of the packet loss that communicates.
The present invention solves the technical scheme that above-mentioned technical problem used: the RFID side of being accurately positioned
Method, comprises the following steps:
A: reader sends the radiofrequency signal including fixed transmission angle；
B: electronic tag receives the signal that reader sends, and detects RSSI, described fixed transmission angle
RSSI value in degree region is more than the RSSI value outside this region；
C: set RSSI value, when the RSSI value that electronic tag detects is more than setting value, counting
Value adds one, and when no more than setting value, count value resets；
D: pre-set count values, when the count value detected is equal to pre-set count values, it is judged that be positioned to
Merit.
Further, described reader is the main website actively sending data, and electronic tag is for receiving master
The passive slave station sending response after the request that station sends.
Further, including N number of application channel, within a unit interval, realize the most described master
The request stood and the response of slave station, described electronic tag one channel of conversion of every N+1 unit interval,
Each unit interval of reader converts a secondary channel；Within a unit interval, main website uses wherein
One channel sends once request, slave station accepts this request Concurrency and send response, main website to receive being somebody's turn to do of slave station
After response, main website and slave station use this channel to communicate.
Further, before main website sets up communication connection with slave station, main website sends handshake request, from
Station returns, after receiving this request, response of shaking hands, and after main website receives response of shaking hands, counting of shaking hands adds one,
Useless receiving response of shaking hands, counting of shaking hands resets；When counting of shaking hands is less than preset value, main website
Repeat to send handshake request；When counting of shaking hands is equal to preset value, main website sends communication connection request,
Main website receives when connection replying of slave station, sets up communication connection.
Further, after main website sets up communication connection with slave station, main website sends confirmation request, from
Station returns after receiving this request and confirms response, and main website does not receive confirmation response, will communication mistake meter
Number adds one, and identical confirmation request is sent in recurrence of laying equal stress on；Main website receives confirmation response, and will communicate mistake
Counting resets；When the error count that communicates is equal to preset value, main station judging communication connection disconnects,
And resend handshake request to set up communication connection.
As preferably, described reader sends radiofrequency signal with constant power.
The present invention compared with prior art has the advantage that
1, the present invention is by detection RSSI value and count value, and uses master-slave communication mode, really
Protect the accuracy of location；
2, the present invention uses the working method of frequency hopping, improves interference free performance；
3, the present invention also uses main website to send request, slave station sends the mode of response, it is to avoid repeat
Position the phenomenon with the packet loss that communicates.
Detailed description of the invention
The RFID accurate positioning method of the present invention is described in detail below, and it comprises the following steps:
Reader sends the radiofrequency signal including fixed transmission angle；The antenna of reader is special
Location antenna, its send signal intensity have the strongest directivity, at certain model of antenna forward
Enclosing and i.e. fix in dispersion angle region, signal can be very strong, after having gone out this region, and signal intensity
Can drastically weaken, but have a critical region on border, in this region, signal intensity is
Uneven.In the method, reader is arranged on fixed position, can send with constant power
Data, so can ensure that transmission signal is substantially constant in the intensity of same position.
In position fixing process, electronic tag receives the signal that sends of reader, and detects and receive
Signal intensity (RSSI)；When label is within the fixing dispersion angle of reader antenna, RSSI
Value can be very big, and when this scope is outer, it is the least that RSSI value can become.According to RSSI value, come
Within judging whether the dispersion angle of entrance reader antenna.In this way, from same direction
Label is advanced toward reader, it is possible to achieve being accurately positioned of fixed position.
When using this method, can set RSSI value, label judges RSSI value each time, when
When the RSSI value that electronic tag detects is more than setting value, count value adds one, when no more than setting value
Time, count value resets.
And, also pre-set count values, after judging RSSI value each time, detects count value, works as detection
When the count value arrived is equal to pre-set count values, it is judged that position successfully.
The described reader of the present invention is the main website actively sending data, and electronic tag is for receiving main website
Passively sending the slave station of response after the request sent, data can actively be sent out by only main website, and slave station can only
Transmission response passive after receiving the request that main website sends, so that it is guaranteed that the accuracy of location.
For solving the problem of interference in position fixing process, introduce the working method of frequency hopping.When equipment is attached
Closely have use same channel interference source time, the proper communication of label and reader can be had a strong impact on.
Label and reader can convert transceiver channel automatically.When including N number of application channel, one
The request of a main website and the response of slave station it is capable of in the individual unit interval.Every N+1 the list of label
Bit time converts a channel, and each unit interval of reader converts a secondary channel.Do so is just
Being capable of label and rest on the time in a channel, reader can scan all of channel.
After the most once main website sends request, main website receives the response of slave station, illustrates that present channel is
Can use, main website and slave station all will stop frequency hopping, use present channel to communicate.Use this side
Formula, can avoid when certain channel is occupied, it is impossible to the problem of proper communication
For solving problem and the problem of communication packet loss of resetting, before setting up connection each time,
All need to be sent handshake request by main website, after slave station receives this request, response of shaking hands can be returned.Main website
After having successfully received response, counting of shaking hands can be added one, if main website is useless receives response of shaking hands, meeting
Counting of shaking hands resets.When counting of shaking hands is less than preset value such as 3, sending out that main website can repeat is shaken hands
Request.When counting of shaking hands is equal to 3, connection request can be sent out by main website, and main website has successfully received slave station
When connection replying, successful connection is set up.Because it is possible that the problem of packet loss in communication process,
Therefore, after successful connection, as main website sends request, do not receive correct response, main website
Communication error count being added one, and sends the request that former frame is identical, just should indeed if now received
Answer, main website will communicate error count reset.When the error count that communicates is equal to preset value such as 5, main
Judgement connection of standing disconnects, resends handshake request and connects to seek to set up.Because reader with
The communication range of label is relatively wider, and outside position location, the position such as 3 meters can normally connect,
Do not have and connect situation about disconnecting, but now RSSI value is the least, from position location the most very
Far.So, at this moment, increase a condition, set up every time and can only position once, with regard to energy after connecting
Enough avoid resetting.
Above-mentioned embodiment is used for illustrative purposes only, and is not limitation of the present invention, has
Close the those of ordinary skill of technical field, without departing from the spirit and scope of the present invention, go back
May be made that various change and modification, the technical scheme of the most all equivalents also should belong to the present invention's
Category.
Claims (4)
1.RFID accurate positioning method, comprises the following steps:
A: reader sends the radiofrequency signal including fixed transmission angle；
B: electronic tag receives the signal that reader sends, and detects RSSI, and the RSSI value in described fixed transmission angular regions is more than the RSSI value outside this region；
C: set RSSI value, when the RSSI value that electronic tag detects is more than setting value, count value adds one, and when no more than setting value, count value resets；
D: pre-set count values, when the count value detected is equal to pre-set count values, it is judged that position successfully；
Described reader is the main website actively sending data, and electronic tag is to receive the passive slave station sending response after the request that main website sends；Including N number of application channel, realizing the request of the most described main website and the response of slave station within a unit interval, described electronic tag every N+1 unit interval converts a channel, and each unit interval of reader converts a secondary channel；Within a unit interval, main website uses a wherein channel to send once request, slave station accepts after this request Concurrency send response, main website to receive this response of slave station, and main website and slave station use this channel to communicate.
Method the most according to claim 1, it is characterised in that: before main website sets up communication connection with slave station, main website sends handshake request, slave station returns, after receiving this request, response of shaking hands, and after main website receives response of shaking hands, counting of shaking hands adds one, useless receiving response of shaking hands, counting of shaking hands resets；When counting of shaking hands is less than preset value, main website repeats to send handshake request；When counting of shaking hands is equal to preset value, main website sends communication connection request, and main website receives when connection replying of slave station, sets up communication connection.
Method the most according to claim 2, it is characterised in that: after main website sets up communication connection with slave station, main website sends confirmation request, slave station returns after receiving this request and confirms response, main website does not receive confirmation response, adds one by communication error count, and identical confirmation request is sent in recurrence of laying equal stress on；Main website receives confirmation response, communication error count is reset；When the error count that communicates is equal to preset value, main station judging communication connection disconnects, and resends handshake request to set up communication connection.
4. according to the method described in any one in claim 1-3, it is characterised in that: described reader sends radiofrequency signal with constant power.
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| CN201410074907.2A CN103824039B (en) | 2014-03-03 | 2014-03-03 | RFID accurate positioning method |
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| CN201410074907.2A CN103824039B (en) | 2014-03-03 | 2014-03-03 | RFID accurate positioning method |
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| CN103824039A CN103824039A (en) | 2014-05-28 |
| CN103824039B true CN103824039B (en) | 2017-01-04 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106257938A (en) * | 2015-06-16 | 2016-12-28 | 中国人民解放军91872部队 | Meet the RFID radio communication anti-interference method of national military standard agreement |
| CN105208577B (en) * | 2015-08-21 | 2019-01-04 | 北京岩与科技有限公司 | A kind of signal quality evaluating method based on low rate wireless network |
| CN108966126A (en) * | 2018-07-13 | 2018-12-07 | 江苏慧学堂系统工程有限公司 | A kind of campus personnel positioning method |
| TWI821119B (en) * | 2023-02-15 | 2023-11-01 | 研華股份有限公司 | Communication channel switching method and system |
Citations (4)
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|---|---|---|---|---|
| CN101523452A (en) * | 2005-02-22 | 2009-09-02 | 德州仪器公司 | System and method for disabling an RFID tag |
| CN101576616A (en) * | 2008-05-06 | 2009-11-11 | 广州香港科大研究开发有限公司 | Indoor positioning system based on RFID technology |
| CN101587182A (en) * | 2009-06-25 | 2009-11-25 | 华南理工大学 | Locating method for RFID indoor locating system |
| CN102520388A (en) * | 2011-11-18 | 2012-06-27 | 天津大学 | Positioning device using phased array principle and in combination with RSSI (Received Signal Strength Indicator) range measuring |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5332878B2 (en) * | 2009-04-28 | 2013-11-06 | 富士通株式会社 | Positioning system |
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- 2014-03-03 CN CN201410074907.2A patent/CN103824039B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101523452A (en) * | 2005-02-22 | 2009-09-02 | 德州仪器公司 | System and method for disabling an RFID tag |
| CN101576616A (en) * | 2008-05-06 | 2009-11-11 | 广州香港科大研究开发有限公司 | Indoor positioning system based on RFID technology |
| CN101587182A (en) * | 2009-06-25 | 2009-11-25 | 华南理工大学 | Locating method for RFID indoor locating system |
| CN102520388A (en) * | 2011-11-18 | 2012-06-27 | 天津大学 | Positioning device using phased array principle and in combination with RSSI (Received Signal Strength Indicator) range measuring |
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| CN103824039A (en) | 2014-05-28 |
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