CN105929387B - Self application distance measuring method is identified based on RFID power emission shelves in tunnel - Google Patents
Self application distance measuring method is identified based on RFID power emission shelves in tunnel Download PDFInfo
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- CN105929387B CN105929387B CN201610355571.6A CN201610355571A CN105929387B CN 105929387 B CN105929387 B CN 105929387B CN 201610355571 A CN201610355571 A CN 201610355571A CN 105929387 B CN105929387 B CN 105929387B
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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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Abstract
The invention discloses the adaptive distance measuring method of reference label is based in a kind of tunnel, there is transmission power gain shelves changeability characteristic using reader, according to change reader transmission power shelves, label to be positioned returns to the signal of reader, identifies that measured label can return to the minimum transmission power shelves of reader.By arranging that the reference label of some known fixed positions judges that the power profile of which fixed reference label is identical as the power profile of label to be positioned, using the average distance of these fixed reference labels as the ranging of measured label using power identification technology.The present invention is based on the identifications of power profile compared to original technology measurement phase difference and signal strength, precision and lower to the sensitive requirements of environment, is conducive to the environment for adapting to variation.It is based on the adaptive ranging technology of reference label in tunnel, adapts to the simple environment in tunnel, and reference label uses, variation influence caused by ranging of environment can be adapted to a greater extent, improve ranging accuracy.
Description
Technical field
The present invention relates to the identification of RFID power emission shelves is based in radio-frequency technique application field more particularly to a kind of tunnel certainly
It is applicable in distance measuring method.
Background technique
There are many kinds of the indoor plain location methods of RFID, but is had based on localization method of the RFID to label ranging to be positioned
There is higher accuracy.The distance measuring method of RFID has based on phase difference ranging method, power variable ranging, signal strength at present
Distance measuring method.Wherein having a core technology scheme is to require that reader measures the return signal intensity of label to be positioned, from
And distance is calculated using certain formula.Thus, there is very big relationship to signal accuracy measured by reader.And signal
It must be defined with the relationship of distance and constant.
Wherein, the RFID distance measuring method based on phase difference, label is tied at object to be measured, by least two readers point
It is not placed in the position around it in 1 meter to 10 meters, each reader respective positions and mutual distance it is known that making each
A reader emits electromagnetic wave by respective antenna, the electromagnetic wave of each spontaneous emission by after RF tag reflection again respectively by
Respective reader is received, between the transmitter phase and receiving phase by measuring the electromagnetic wave that each reader is emitted
Phase difference determines RF tag respectively the distance between with each reader.
RFID distance measuring method based on signal strength is used by detecting and the signal strength of mobile tag (RSSI).Root
It is believed that number Strength co-mputation RFID reader is at a distance from mobile tag.RFID reader can acquire mobile tag to be positioned and read
The signal strength of device, and it is uploaded to host computer.According to the data of reader acquisition output, host computer can handle accordingly to obtain
Ranging information to reference label node.It is detected according to current mobile tag node to be positioned from reference label node
Received signal strength RSSI numerical value acquires distance according to formula (1).
Wherein: A represents the signal strength at one meter of distance；RSSI (d) represents the signal strength between distance d；N is represented
Path loss namely environment are to the attenuation coefficient of signal, depending on specific environment.
Art methods require the signal strength measured or phase difference more accurate, if its value surveyed is inaccurate,
Corresponding distance calculates also can very big error.But signal strength or phase difference ordinary can be influenced by surrounding enviroment, such as temperature,
Dust, barrier suddenly change, also can with the time also can be unstable, it is unstable that the variation of environment causes to calculate resulting distance
It is fixed, to keep ranging inaccurate.The relationship of signal strength and distance will receive the influence of the position of label to be positioned, thus
Influence the accuracy of ranging.
Summary of the invention
It is simple, at low cost that the object of the present invention is to provide a kind of structures, intelligent measurement, flexibility switching, versatile machine
Device people's welding system.
For achieving the above object, the technical scheme is that
Self application distance measuring method is identified based on RFID power emission shelves in a kind of tunnel, comprising the following steps:
Step (1), reader identify the power profile WD of label to be positioned；
Step (2), simultaneously with step (1), reader scans identify the power of all presetting fixed reference labels
Shelves；The fixed reference label is between the maximum distance that reader can reach, and uniform intervals arrangement is not less than undetermined
The label of position tag power gear number.
Step (3) finds out all fixed reference labels that power profile is WD；
Step (4), calculate step (3) in fixed reference label and reader average distance, this distance for finally to
Position the ranging distance of label and reader；
In the step (1), reader identifies that the power profile WD of label to be positioned is the function by constantly changing reader
Rate emits shelves, according to the data-signal returned after reception label to be positioned, and is uploaded to host computer and makees identification judgement, specific steps
Are as follows:
Step (1), reader initialization, into reception pattern, and sets delay；
Step (2), if receive the transmission power instruction of host computer；If being transferred to step (3), it is otherwise transferred to step
(4)；
The host computer instruction received is sent to label to be positioned by step (3)；Reader enters reception pattern；
Step (4), if receive the data of label to be positioned；If being transferred to step (7), it is otherwise transferred to step (5)；
Step (5), data receiver count after position adds 1 certainly whether be greater than 4；If being transferred to step (6), it is otherwise transferred to step
(2)；
The transmission power of step (6), reader rises one grade, and performance number is sent to label to be positioned, is transferred to step
(2)；
Step (7), correction；
Power is sent shelves and is uploaded to host computer by serial ports, and data receiver numeration position is reset by step (8)；
Wherein, the correction course of step (7) is as follows:
Step (a), judges whether transmission power is greater than the tag power to be positioned received, if being transferred to step (b)；It is no
Then step is transferred to (c)；
The transmission power of reader is arranged to the transmission power of label to be positioned by step (b)；
Step (c) judges whether that the number for repeating to receive same label equal-wattage value is 10；If being transferred to step (d),
Otherwise it is transferred to step (c)；
Reader transmission power is dropped one grade, and this transmission power level is sent to label to be positioned by step (d), is transferred to
Step (e)；
Step (e) judges whether otherwise the signal for receiving label to be positioned again is transferred to if being transferred to step (c) again
Step (f)；
Step (f), reader transmission power toward adding one grade, export the reader transmission power shelves automatically.
The beneficial effects of the present invention are:
The present invention proposes a kind of technical method of reader identification tag signal power shelves, has transmitting function using reader
Rate gain shelves changeability characteristic, according to reader transmission power shelves are changed, label to be positioned returns to the signal of reader, identifies
Measured label can return to the minimum transmission power shelves of reader.It proposes in a kind of tunnel based on the adaptive ranging skill of reference label
Art, by arranging which fixed reference label is the reference label of some known fixed positions judge using power identification technology
Power profile it is identical as the power profile of label to be positioned, using the average distance of these fixed reference labels as measured label
Ranging.Compared with the existing technology, effect of the invention includes:
1. the identification based on power profile is compared to original technology measurement phase difference and signal strength, precision and to the quick of environment
Perception requirement is lower, is conducive to the environment for adapting to variation.
2. being based on the adaptive ranging technology of reference label in tunnel, the simple environment in tunnel is adapted to, and with reference to mark
Label use, and can adapt to variation influence caused by ranging of environment to a greater extent, improve ranging accuracy.
Term is explained:
RFID: coming from English name Radio Frequency Identification, is radio frequency identification, also known as less radio-frequency
Identification, is a kind of communication technology, and specific objective can be identified by radio signals and reads and writes related data, without identifying system
Mechanical or optical contact is established between specific objective.
Reader (Reader): read or label information equipment, may be designed as hand-held rfid reader (such as:
) or fixed type reader-writer C5000W.
Label (Tag): being made of coupling element and chip, and each RFID tag has unique electronic code, is attached to
Target object is identified on object, is commonly called as electronic tag or intelligent label.
Detailed description of the invention
Fig. 1 is the schematic illustration that reader identifies tag power shelves；
Fig. 2 is that the adaptive range measurement principle schematic diagram of reference label is based in tunnel of the present invention.
Specific embodiment
Below in conjunction with attached drawing to the present invention, technical scheme in the embodiment of the invention is clearly and completely described.
As shown in connection with fig. 2, self application distance measuring method, packet are identified based on RFID power emission shelves in a kind of tunnel of the invention
Include following steps:
Step (1), reader 1 identify the power profile WD of label 2 to be positioned；
Step (2), simultaneously with step (1), the function of all presetting fixed reference labels 3 of 1 scanning recognition of reader
Rate shelves；The fixed reference label 3 is between the maximum distance that reader 1 can reach, and uniform intervals arrangement is not less than
The label of tag power gear number to be positioned.
Step (3) finds out all fixed reference labels 3 that power profile is WD；
Step (4) calculates the average distance of the fixed reference label 3 and reader 1 in step (3), this distance is final
The ranging distance of label 2 and reader 1 to be positioned；
In the step (1), reader 1 identifies that the power profile WD of label 2 to be positioned is by constantly changing reader 1
Power emission shelves, according to receiving the data-signal returned after label to be positioned, and be uploaded to host computer 4 and make identification judgement, knot
It closes shown in Fig. 1, specific steps are as follows:
Step (1), reader 1 initialize, and into reception pattern, and set delay；
Step (2), if receive the transmission power instruction of host computer 4；If being transferred to step (3), it is otherwise transferred to step
(4)；
The instruction of host computer 4 received is sent to label 2 to be positioned by step (3)；Reader 1 enters reception pattern；
Step (4), if receive the data of label 2 to be positioned；If being transferred to step (7), it is otherwise transferred to step (5)；
Step (5), data receiver count after position adds 1 certainly whether be greater than 4；If being transferred to step (6), it is otherwise transferred to step
(2)；
The transmission power of step (6), reader 1 rises one grade, and performance number is sent to label 2 to be positioned, is transferred to step
Suddenly (2)；
Step (7), correction；
Power is sent shelves and is uploaded to host computer 4 by serial ports, and data receiver numeration position is reset by step (8)；
When data receiver numeration position is set equal to or more than being equal to 4, the transmission power of reader is increased by one grade, is kept away
Exempt from because the active electronic label operating voltage for using tag battery to power is unstable, or because occurs suddenly and evanescent
The factors such as obstacle, and reader is caused not receive the signal of label.
It is carry out judging to be ensured of several times because reader receives not beyond the maximum signal transmitting radius of label more
To the signal of label.Increase the transmission power of label by one grade, and this performance number is transmitted to label, makes
Its transmission power increases by one grade therewith, increases the radius of transmitting signal.
Wherein, the correction course of step (7) is as follows:
Step (a), judges whether transmission power is greater than the tag power to be positioned received, if being transferred to step (b)；It is no
Then step is transferred to (c)；
The transmission power of reader is arranged to the transmission power of label to be positioned by step (b)；
Step (c) judges whether that the number for repeating to receive same label equal-wattage value is 10；If being transferred to step (d),
Otherwise it is transferred to step (c)；
Reader transmission power is dropped one grade, and this transmission power level is sent to label to be positioned by step (d), is transferred to
Step (e)；
Step (e) judges whether otherwise the signal for receiving label to be positioned again is transferred to if being transferred to step (c) again
Step (f)；
Step (f), reader transmission power toward adding one grade, export the reader transmission power shelves automatically.
In the correction portion program of reader, when the power signal that the label received sends over is less than the hair of reader
When penetrating power signal value, lesser tag power is set by transmission power.Because in the lesser situation of tag power transmitted value
Under, reader can receive to obtain label signal, it was demonstrated that the transmission power of reader is excessive, can reduce by one grade of transmission power down.
Stablize receive same tag power value 10 times or more in the case where, one grade of power can be reduced, if can be after
Continued access receives label signal, it was demonstrated that transmission power before is excessive.If not receiving signal, power up adds one grade automatically,
Then identify that this shelves is power profile where label.
Described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the present invention
In embodiment, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
Claims (1)
1. identifying self application distance measuring method based on RFID power emission shelves in a kind of tunnel, which comprises the following steps:
Step (1), reader identify the power profile WD of label to be positioned；
Step (2), simultaneously with step (1), reader scans identify the power profile of all presetting fixed reference labels；
Step (3) finds out all fixed reference labels that power profile is WD；
Step (4) calculates the average distance of the fixed reference label and reader in step (3), this distance is final to be positioned
The ranging distance of label and reader；
In the step (1), reader identifies that the power profile WD of label to be positioned is to send out by constantly changing the power of reader
Shelves are penetrated, according to the data-signal returned after reception label to be positioned, and host computer is uploaded to and makees identification judgement, specific steps are as follows:
Step (1), reader initialization, into reception pattern, and sets delay；
Step (2), if receive the transmission power instruction of host computer；If being transferred to step (3), it is otherwise transferred to step (4)；
The host computer instruction received is sent to label to be positioned by step (3)；Reader enters reception pattern；
Step (4), if receive the data of label to be positioned；If being transferred to step (7), it is otherwise transferred to step (5)；
Step (5), data receiver count after position adds 1 certainly whether be greater than 4；If being transferred to step (6), it is otherwise transferred to step (2)；
The transmission power of step (6), reader rises one grade, and performance number is sent to label to be positioned, is transferred to step (2)；
Step (7), correction；
Power is sent shelves and is uploaded to host computer by serial ports, and data receiver numeration position is reset by step (8)；
Wherein, the correction course of step (7) is as follows:
Step (a), judges whether transmission power is greater than the tag power to be positioned received, if being transferred to step (b)；Otherwise it walks
Suddenly it is transferred to (c)；
The transmission power of reader is arranged to the transmission power of label to be positioned by step (b)；
Step (c) judges whether that the number for repeating to receive same label equal-wattage value is 10；If being transferred to step (d), otherwise
It is transferred to step (c)；
Reader transmission power is dropped one grade, and this transmission power level is sent to label to be positioned by step (d), is transferred to step
(e)；
Step (e) judges whether otherwise the signal for receiving label to be positioned again is transferred to step if being transferred to step (c) again
(f)；
Step (f), reader transmission power toward adding one grade, export the reader transmission power shelves automatically；
In step (2), the fixed reference label is the uniform intervals cloth between the maximum distance that reader can reach
Set the label not less than tag power gear number to be positioned.
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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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|---|---|---|---|
| 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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| CN105929387B true CN105929387B (en) | 2018-12-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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 |
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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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