CN105929387A - RFID (radio frequency identification) power transmitting level identification-based adaptive ranging method applied to tunnel - Google Patents
RFID (radio frequency identification) power transmitting level identification-based adaptive ranging method applied to tunnel Download PDFInfo
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- CN105929387A CN105929387A CN201610355571.6A CN201610355571A CN105929387A CN 105929387 A CN105929387 A CN 105929387A CN 201610355571 A CN201610355571 A CN 201610355571A CN 105929387 A CN105929387 A CN 105929387A
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- power
- reader
- label
- shelves
- tag
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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
- G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
- G01S11/02—Systems for determining distance or velocity not using reflection or reradiation using radio waves
- G01S11/06—Systems for determining distance or velocity not using reflection or reradiation using radio waves using intensity measurements
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- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a reference tag-based adaptive ranging method applied to a tunnel. Based on a characteristic that the transmitting power gain levels of readers are variable, when the transmitting power levels of the readers are changed, a tag to be positioned returns signals to the readers, and therefore, the minimum level of transmitting power which can be returned to the readers by the tag to be positioned can be identified. Some known fixed reference tags are arranged; and fixed reference tags of which the power levels are the same with the power level of the tag to be positioned can be judged by using a power identification technology, and the average distance of the fixed reference tags is adopted as the measured distance of the tag to be positioned. Compared with an original technology according to which measurement phase difference and signal intensity are measured, the ranging method of the invention is based on power level identification and has lower requirements for accuracy and sensitivity to the environment, which is conducive to the adaptability of the method to changing environment. The reference tag-based adaptive ranging technology applied to the tunnel is adaptive to the simple environment of the tunnel. The reference tags are used, and therefore, the method can adapt to the influence of environment change on ranging to the greatest extent, and therefore, ranging accuracy can be improved.
Description
Technical field
The present invention relates to radio-frequency technique application, particularly relate in a kind of tunnel based on RFID power
Launch shelves identification self application distance-finding method.
Background technology
Plain location method indoor for RFID has a variety of, but surveys label to be positioned based on RFID
Away from localization method there is higher accuracy.The distance-finding method of RFID has based on phase contrast survey at present
Away from method, power variable range finding, signal intensity distance-finding method.Wherein there is a core technology scheme
It is to be desirable that the return signal intensity that reader records label to be positioned, thus utilizes certain formula to count
Calculate distance.Thus, it has the biggest relation to signal accuracy measured by reader.And signal with
The relation of distance must be clear and definite and constant.
Wherein, RFID distance-finding method based on phase contrast, label is tied at target to be measured, near
The position that few two readers are respectively placed in about in 1 meter to 10 meters, each reader is respective
Position and distance each other launch electromagnetic wave it is known that make each reader pass through respective antenna,
The electromagnetic wave of each spontaneous emission is received by respective reader after being reflected by described radio-frequency (RF) tag the most respectively,
By measuring the phase contrast between transmitter, phase and the receiving phase of electromagnetic wave that each reader is launched,
Determine radio-frequency (RF) tag distance respectively and between each reader.
RFID distance-finding method based on signal intensity uses strong with the signal of mobile tag by detecting
Degree (RSSI).The distance of RFID reader and mobile tag is calculated according to signal intensity.RFID
Reader can gather the signal intensity of mobile tag to be positioned and reader, and is uploaded to host computer.Root
According to the data of reader collection output, host computer can handle accordingly to obtain and treat reference label node
Ranging information.Connecing of reference label node is come from according to mobile tag nodal test the most to be positioned
Receive signal intensity RSSI numerical value, try to achieve distance according to formula (1).
Wherein: A represents the signal intensity when distance one meter；RSSI (d) represents between distance d
Signal intensity；N delegated path is lost, namely the attenuation quotient that environment is to signal, depending on specific environment
Fixed.
Signal intensity or phase contrast that art methods requirement records are more accurate, if its value surveyed
Inaccuracy, then corresponding distance calculating also can the biggest error.But signal intensity or phase contrast can ordinary be subject to
The impact of surrounding enviroment, such as temperature, dust, barrier change suddenly, as well as the time also
Can be unstable, the change of environment causes the distance calculating gained unstable, so that range finding inaccuracy.
Signal intensity can be affected by the position of label to be positioned with the relation of distance, thus affects survey
Away from accuracy.
Summary of the invention
It is an object of the invention to provide a kind of simple in construction, low cost, Intelligent Measurement, flexibility switches,
The robot welding system of highly versatile.
For achieving the above object, the technical scheme is that
Based on RFID power emission shelves identification self application distance-finding method in a kind of tunnel, including following step
Rapid:
Step (one), the power shelves WD of reader identification label to be positioned；
Step (two), with step () simultaneously, all presetting the fixing of reader scans identification
The power shelves of reference label；Described fixed reference label is the maximum distance that can reach at reader
Between, uniform intervals arranges the label being not less than tag power gear number to be positioned.
Step (three), finds out all fixed reference labels that power shelves are WD；
The average distance of step (four), the fixed reference label in calculation procedure (three) and reader,
This distance is the range finding distance of final label to be positioned Yu reader；
In described step (), the power shelves WD of reader identification label to be positioned is by constantly
Change the power emission shelves of reader, according to the data signal returned after receiving label to be positioned, and on
Pass to host computer to make to identify judgement, concretely comprise the following steps:
Step (1), reader initializes, and enters reception pattern, and sets time delay；
Step (2), if receive the transmit power instruction of host computer；If the step of proceeding to (3),
Otherwise proceed to step (4)；
Step (3), is sent to label to be positioned the host computer instruction received；Reader enters and connects
Receipts pattern；
Step (4), if receive the data of label to be positioned；If the step of proceeding to (7), no
Then proceed to step (5)；
Step (5), whether data receiver numeration position is more than 4 after adding 1；If the step of proceeding to (6),
Otherwise proceed to step (2)；
Step (6), the transmitting power rise of reader one grade, and performance number is sent to mark to be positioned
Sign, proceed to step (2)；
Step (7), correction；
Step (8), sends power shelves and is uploaded to host computer by serial ports, and data receiver is counted
Position resets；
Wherein, the trimming process of step (7) is as follows:
Step (a), it is judged that launch whether power is more than the tag power to be positioned received, if turning
Enter step (b)；Otherwise step proceeds to (c)；
Step (b), becomes the transmitting power of label to be positioned by the power setting of launching of reader；
Step (c), it may be judged whether the number of times repeating to receive same label equal-wattage value is 10；If
It is to proceed to step (d), otherwise proceeds to step (c)；
Step (d), launches reader power and drops one grade, and this transmission power level is sent to undetermined
Position label, proceeds to step (c)；
Step (e), it may be judged whether again receive the signal of label to be positioned, if proceeding to step again
C (), otherwise proceeds to step (f)；
Step (f), reader is launched power automatically toward adding one grade, is exported this reader and launch power shelves.
The invention has the beneficial effects as follows:
The present invention proposes the technical method of a kind of reader identification tag signal power shelves, uses reader
There is transmitting power gain shelves transmutability characteristic, launch power shelves, mark to be positioned according to changing reader
Sign the signal returning to reader, identify that measured label can return the minimum transmitting power shelves of reader.
Propose based on reference label self adaptation ranging technology in a kind of tunnel, fixing by arranging known to some
The reference label of position, utilizes power identification technology, it is judged that the power shelves of which fixed reference label with
The power shelves of label to be positioned are identical, using the average distance of these fixed reference labels as measured mark
The range finding signed.Relative to prior art, the effect of the present invention includes:
1. original commercial measurement phase contrast and signal intensity are compared in identifications based on power shelves, its precision and
Lower to the sensitive requirements of environment, be conducive to adapting to the environment of change.
2., based on reference label self adaptation ranging technology in tunnel, it adapts to the simple environment in tunnel,
And reference label uses, it is possible to adapt to the impact that range finding is caused by the change of environment to a greater extent,
Improve range finding accuracy.
Term is explained:
RFID: from English name Radio Frequency Identification, for RF identification,
Also known as radio frequency identification, it is a kind of communication technology, can by radio signals identification specific objective also
Read-write related data, and set up machinery or optical contact between system and specific objective without identifying.
Reader (Reader): read or the equipment of label information, may be designed as hand-held rfid and reads
Write device (such as: C5000W) or fixed type reader-writer.
Label (Tag): be made up of coupling element and chip, each RFID label tag has unique electronics
Coding, is attached on object identify destination object, is commonly called as electronic tag or intelligent label.
Accompanying drawing explanation
Fig. 1 is the principle schematic of reader identification tag power shelves；
Fig. 2 is based on reference label self adaptation range measurement principle schematic diagram in tunnel of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing to the present invention, the technical scheme in the embodiment of the present invention is carried out clear,
It is fully described by.
Shown in Fig. 2, adaptive based on RFID power emission shelves identification in a kind of tunnel of the present invention
With distance-finding method, comprise the following steps:
Step (one), reader 1 identifies the power shelves WD of label 2 to be positioned；
Step (two), with step () simultaneously, all presetting the consolidating of reader 1 scanning recognition
Determine the power shelves of reference label 3；Described fixed reference label 3 is can reach at reader 1
Between maximum distance, uniform intervals arranges the label being not less than tag power gear number to be positioned.
Step (three), finds out all fixed reference labels 3 that power shelves are WD；
Step (four), the fixed reference label 3 in calculation procedure (three) and the average departure of reader 1
From, this distance is the range finding distance of final label 2 to be positioned with reader 1；
In described step (), reader 1 identifies that the power shelves WD of label 2 to be positioned is for passing through
Constantly change the power emission shelves of reader 1, according to the data signal returned after receiving label to be positioned,
And it is uploaded to host computer 4 work identification judgement, shown in Fig. 1, concretely comprise the following steps:
Step (1), reader 1 initializes, and enters reception pattern, and sets time delay；
Step (2), if receive the transmit power instruction of host computer 4；If the step of proceeding to (3),
Otherwise proceed to step (4)；
Step (3), is sent to label 2 to be positioned host computer 4 instruction received；Reader 1
Enter reception pattern；
Step (4), if receive the data of label 2 to be positioned；If the step of proceeding to (7),
Otherwise proceed to step (5)；
Step (5), whether data receiver numeration position is more than 4 after adding 1；If the step of proceeding to (6),
Otherwise proceed to step (2)；
Step (6), the transmitting power rise of reader 1 one grade, and performance number is sent to undetermined
Position label 2, proceeds to step (2)；
Step (7), correction；
Step (8), sends power shelves and is uploaded to host computer 4 by serial ports, and data receiver is remembered
Numerical digit resets；
Arrange data receiver numeration position equal to or more than equal to 4 when, by the transmitting power of reader
Increase by one grade, it is to avoid the active electronic label running voltage because using tag battery to power is unstable, or
Since the factor such as appearance and evanescent obstacle suddenly, and cause reader not receive label
Signal.
Judge ensure that being because reader launches radius beyond the signal that label is maximum the most several times
And do not receive the signal of label.The transmitting power making label in this case increases by one grade, and
This performance number is transmitted to label so that it is launching power increases by one grade therewith, increases and launch the half of signal
Footpath.
Wherein, the trimming process of step (7) is as follows:
Step (a), it is judged that launch whether power is more than the tag power to be positioned received, if turning
Enter step (b)；Otherwise step proceeds to (c)；
Step (b), becomes the transmitting power of label to be positioned by the power setting of launching of reader；
Step (c), it may be judged whether the number of times repeating to receive same label equal-wattage value is 10；If
It is to proceed to step (d), otherwise proceeds to step (c)；
Step (d), launches reader power and drops one grade, and this transmission power level is sent to undetermined
Position label, proceeds to step (c)；
Step (e), it may be judged whether again receive the signal of label to be positioned, if proceeding to step again
C (), otherwise proceeds to step (f)；
Step (f), reader is launched power automatically toward adding one grade, is exported this reader and launch power shelves.
In the correction portion program of reader, the power signal sended over when the label received is less than
During the transmitting power signal value of reader, it is less tag power by launching power setting.Because
In the case of tag power transmitted value is less, read write line can accept to obtain label signal, it was demonstrated that read write line
Transmitting power excessive, can down reduce by one grade launch power.
In the case of stably receiving same tag power value more than 10 times, one grade of merit can be reduced
Rate, if label signal can be continued to, it was demonstrated that transmitting power before is excessive.If received not
To signal, power the most up adds one grade, then identify that these shelves are label place power shelves.
Described embodiment is only a part of embodiment of the present invention rather than whole embodiments.
Based on the embodiment in the present invention, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, broadly falls into the scope of protection of the invention.
Claims (2)
1. based on RFID power emission shelves identification self application distance-finding method in a tunnel, it is characterised in that
Comprise the following steps:
Step (one), the power shelves WD of reader identification label to be positioned；
Step (two), with step () simultaneously, all presetting fixed reference of reader scans identification
The power shelves of label；
Step (three), finds out all fixed reference labels that power shelves are WD；
Step (four), the average distance of the fixed reference label in calculation procedure (three) and reader, this away from
From the range finding distance for final label to be positioned Yu reader；
In described step (), the power shelves WD of reader identification label to be positioned is by constantly
Change the power emission shelves of reader, according to the data signal returned after receiving label to be positioned, and on
Pass to host computer to make to identify judgement, concretely comprise the following steps:
Step (1), reader initializes, and enters reception pattern, and sets time delay；
Step (2), if receive the transmit power instruction of host computer；If the step of proceeding to (3),
Otherwise proceed to step (4)；
Step (3), is sent to label to be positioned the host computer instruction received；Reader enters and connects
Receipts pattern；
Step (4), if receive the data of label to be positioned；If the step of proceeding to (7), no
Then proceed to step (5)；
Step (5), whether data receiver numeration position is more than 4 after adding 1；If the step of proceeding to (6),
Otherwise proceed to step (2)；
Step (6), the transmitting power rise of reader one grade, and performance number is sent to mark to be positioned
Sign, proceed to step (2)；
Step (7), correction；
Step (8), sends power shelves and is uploaded to host computer by serial ports, and data receiver is counted
Position resets；
Wherein, the trimming process of step (7) is as follows:
Step (a), it is judged that launch whether power is more than the tag power to be positioned received, if turning
Enter step (b)；Otherwise step proceeds to (c)；
Step (b), becomes the transmitting power of label to be positioned by the power setting of launching of reader；
Step (c), it may be judged whether the number of times repeating to receive same label equal-wattage value is 10；If
It is to proceed to step (d), otherwise proceeds to step (c)；
Step (d), launches reader power and drops one grade, and this transmission power level is sent to undetermined
Position label, proceeds to step (c)；
Step (e), it may be judged whether again receive the signal of label to be positioned, if proceeding to step again
C (), otherwise proceeds to step (f)；
Step (f), reader is launched power automatically toward adding one grade, is exported this reader and launch power shelves.
Based on RFID power emission shelves identification self application in a kind of tunnel the most according to claim 1
Distance-finding method, it is characterised in that in step (two), described fixed reference label is at reader
Between the maximum distance that can reach, uniform intervals arranges the mark being not less than tag power gear number to be positioned
Sign.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610355571.6A CN105929387B (en) | 2016-05-26 | 2016-05-26 | Self application distance measuring method is identified based on RFID power emission shelves in tunnel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610355571.6A CN105929387B (en) | 2016-05-26 | 2016-05-26 | Self application distance measuring method is identified based on RFID power emission shelves in tunnel |
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| CN105929387A true CN105929387A (en) | 2016-09-07 |
| CN105929387B CN105929387B (en) | 2018-12-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111611816A (en) * | 2019-02-22 | 2020-09-01 | 立象科技股份有限公司 | Radio frequency identification reading device and power setting method thereof |
| TWI749291B (en) * | 2019-02-22 | 2021-12-11 | 立象科技股份有限公司 | Rfid reader and power setting method thereof |
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| CN103630875A (en) * | 2013-11-21 | 2014-03-12 | 天津中兴智联科技有限公司 | Radio frequency identifying and positioning method and device |
| CN104765016A (en) * | 2014-12-30 | 2015-07-08 | 天津工业大学 | Radio frequency identification and location method based on intelligent control over power |
| CN105491650A (en) * | 2015-12-29 | 2016-04-13 | 深圳市海云天科技股份有限公司 | Method and system of power adaptive adjustment of radio frequency reader |
| CN205210919U (en) * | 2015-12-02 | 2016-05-04 | 东莞思谷数字技术有限公司 | Power adjustable high frequency read write line |
-
2016
- 2016-05-26 CN CN201610355571.6A patent/CN105929387B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102663328A (en) * | 2012-05-25 | 2012-09-12 | 中山大学 | Method for improving electron label reading efficiency based on power control |
| CN103177276A (en) * | 2013-04-07 | 2013-06-26 | 南京大学 | Cargo positioning method and system based on adaptive adjustment antenna power |
| CN103630875A (en) * | 2013-11-21 | 2014-03-12 | 天津中兴智联科技有限公司 | Radio frequency identifying and positioning method and device |
| CN104765016A (en) * | 2014-12-30 | 2015-07-08 | 天津工业大学 | Radio frequency identification and location method based on intelligent control over power |
| CN205210919U (en) * | 2015-12-02 | 2016-05-04 | 东莞思谷数字技术有限公司 | Power adjustable high frequency read write line |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111611816A (en) * | 2019-02-22 | 2020-09-01 | 立象科技股份有限公司 | Radio frequency identification reading device and power setting method thereof |
| TWI749291B (en) * | 2019-02-22 | 2021-12-11 | 立象科技股份有限公司 | Rfid reader and power setting method thereof |
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| Publication number | Publication date |
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| CN105929387B (en) | 2018-12-07 |
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Granted publication date: 20181207 |