CN103605996B - A kind of active radio frequency identification system - Google Patents
A kind of active radio frequency identification system Download PDFInfo
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- CN103605996B CN103605996B CN201310606160.6A CN201310606160A CN103605996B CN 103605996 B CN103605996 B CN 103605996B CN 201310606160 A CN201310606160 A CN 201310606160A CN 103605996 B CN103605996 B CN 103605996B
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Abstract
The invention discloses a kind of active radio frequency identification system, including a plurality of frequency channels having an agreement that communicate of card reader and electronic tag, card reader and electronic tag, electronic tag uses frequency hopping mode of operation, the most actively sends data on a plurality of frequency channels；Card reader has multiple RF receiving circuit, is simultaneously in reception state, the corresponding frequency channel of each RF receiving circuit.The present invention solves the signal conflict problem in thousand sheets level electronic labelling system, moreover it is possible to the system that is prevented effectively from outer wireless signal interference, it is achieved efficiently exhaustive reads.
Description
[technical field]
The present invention relates to active radio frequency identification, particularly relate to a kind of active radio frequency identification system.
[background technology]
Existing active RF I d system typically uses frequency hopping and fixed frequency both of which, and wherein frequency hopping working method is:
When electronic tag communicates with card reader every time, a secondary data, Card Reader will be sent on the frequency being had an agreement
Device receives frequency in certain time point only one of which, then with regular hour order switch operating frequency.Fixed
The working method of frequency is: electronic tag is with fixing frequency sending data, and card reader also receives with fixed frequency.
The purpose using frequency hopping mode of operation is the air interference outside anti-locking system, owing to this pattern is once
Data same in communication process need to repeat on a different frequency to send repeatedly, cause operating current relatively big,
Be not suitable for the electronic tag that button cell is powered and needed persistently to use the several years.Large-scale application is active now
Electronic tag typically uses determines frequency mode of operation.It is one second that label sends interval.Increasing along with number of labels
Many, such as home-school communication system, when needing to read the electronic tag more than a thousand sheets, card reader single frequency simultaneously
Signal load on point is the heaviest, is susceptible to label signal conflict, affects the recognition of multi-tag.Although anti-
There is random delay scheduling algorithm to process in conflict, but these algorithms are in the system of label actively unidirectional emission, nothing
Method fundamentally solves the problem of channel loading, when number of labels is sufficiently large, does not has obvious effect.
[summary of the invention]
The technical problem to be solved in the present invention is to provide one and believes in anti-locking system number of labels is the biggest when
Number conflict active radio frequency identification system.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is, a kind of active radio frequency identification system
System, a plurality of frequencies having an agreement that communicate including card reader and electronic tag, card reader and electronic tag are led to
Road, electronic tag uses frequency hopping mode of operation, the most actively sends data on a plurality of frequency channels；Read
Card utensil has multiple RF receiving circuit, is simultaneously in reception state, corresponding one of each RF receiving circuit
Frequency channel.
Above-described active radio frequency identification system, electronic tag sends data with the fixing cycle, sends out every time
Send change one frequency channel.Electronic tag uses unidirectional sending mode, is sent completely rear dormancy and waits timing
Wake up up.
Above-described active radio frequency identification system, card reader includes microcontroller, antenna, and receiving attenuation is adjusted
Joint device, multi-path power divider and a plurality of described RF receiving circuit；The signal that antenna receives is adjusted through overdamping
Entering multi-path power divider after joint device decay, signal power is evenly distributed to each radio frequency by multi-path power divider and connects
Receive circuit；All RF receiving circuits, by same microprocessor controls, use same data-interface with micro-
Controller carries out data communication.
Above-described active radio frequency identification system, the microprocessor a plurality of interruptions of unlatching monitor radio frequency respectively and connect
Receive the interrupt output of circuit, when detecting that any one RF receiving circuit has data to export, interrupt service
Program receives data by data-interface immediately and the data received is deposited in the queue of level cache；Receive
To radio frequency reception data microcontroller task process in be in priority, during the microcontroller free time, right
Data in level cache carry out repeating data filtering, and the result after process loads L2 cache, waits upper
Machine extracts data.
The electronic tag of the active radio frequency identification system of the present invention uses frequency hopping mode of operation, solves thousand sheets level
Signal conflict problem in electronic labelling system, moreover it is possible to the system that is prevented effectively from outer wireless signal interference, it is achieved high
Effect exhaustive reads.
[accompanying drawing explanation]
The present invention is further detailed explanation with detailed description of the invention below in conjunction with the accompanying drawings.
Fig. 1 is embodiment of the present invention card reader theory diagram.
Fig. 2 is that embodiment of the present invention electronic tag sends time and frequency diagram.
[detailed description of the invention]
The active radio frequency identification system of the embodiment of the present invention includes card reader and electronic tag, and tag circuit uses
Known circuit structure, its working method is as follows:
1. basic circuit parameter and the wakeup time of 1 second, then dormancy are set after label powers on；
2. carry out random delay after label dormancy awakening, delay time after 0 to 10ms, time delay at 2.440GHz
Upper transmission one secondary data, is sent completely rear dormancy and waits timing wake-up；
3. in 2.450GHz frequency, send a secondary data after waking up up next time, circulate the most in turn.
The enforcement structural main portion of card reader is as it is shown in figure 1, antenna connects with numeral adjustable attenuator HMC274
Connecing, numeral adjustable attenuator HMC274 is controlled by microcontroller LPC1754.Numeral adjustable attenuator HMC274
Radio frequency output pin connect the input pin of power splitter PD2450, two output pins of power splitter are respectively connected to two to be had
NRF24L01 radio frequency chip and the RF receiving circuit of peripheral circuit composition thereof, signal averaging is distributed by power splitter
To two RF receiving circuits.Two NRF24L01 radio frequency chips are all controlled by microcontroller LPC1754, make
Data communication is carried out with same SPI mouth.MCU is performed by below scheme after powering on:
1. configuring the running parameter of two radio frequency chips, frequency is respectively 2.440GHz and 2.450GHz, other
Parameter is identical.Arranging two radio frequency chips and enter reception pattern, MCU opens two and interrupts monitoring radio frequency core respectively
The interrupt output of sheet.
2., when detecting that any road radio frequency chip has data receiver, interrupt service routine passes through SPI immediately
Interface takes out the data received, and is deposited in the queue of level cache.
3. taking out radio frequency reception data and be in high priority in the task of microcontroller, microcontroller is idle
Time, the data in level cache being carried out repeats data filtering etc. and processes, the result after process loads two grades and delays
Deposit, wait that host computer extracts data.
The electronic tag of the active radio frequency identification system of above example of the present invention uses frequency hopping mode of operation, solves
Determine the aerial signal collision problem in thousand sheets level electronic labelling system, moreover it is possible to the outer wireless communication of the system that is prevented effectively from
Number interference, it is achieved efficiently exhaustive reads.Electronic tag is actively launched, one-way communication, stops after distributing data
Sleeping, maintain microwatt level power consumption operating mode, battery has longer service life.
Claims (2)
1. an active radio frequency identification system, including card reader and electronic tag, it is characterised in that card reader
With a plurality of frequency channels having an agreement that communicate of electronic tag, electronic tag uses frequency hopping mode of operation,
Data are the most actively sent on a plurality of frequency channels；Card reader has multiple RF receiving circuit, locates simultaneously
In the state of reception, the corresponding frequency channel of each RF receiving circuit；Electronic tag was sent out with the fixing cycle
Sending data, send one frequency channel of change every time, electronic tag uses unidirectional sending mode, is sent completely
Rear dormancy waits timing wake-up；Card reader includes microcontroller, antenna, receiving attenuation actuator, multichannel merit
Divide device and a plurality of described RF receiving circuit；The signal that antenna receives is laggard through the decay of Attenuation adjustable device
Entering multi-path power divider, signal power is evenly distributed to each RF receiving circuit by multi-path power divider；All
RF receiving circuit, by same microprocessor controls, uses same data-interface and microcontroller number
According to communication.
Active radio frequency identification system the most according to claim 1, it is characterised in that microprocessor is opened
A plurality of interruptions monitor the interrupt output of RF receiving circuit respectively, when any one radio frequency reception electricity being detected
When road has data to export, interrupt service routine receives data by data-interface immediately and the data received is deposited
Enter in the queue of level cache；During the microcontroller free time, carry out the data in level cache repeating data
Filtering, the result after process loads L2 cache, waits that host computer extracts data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310606160.6A CN103605996B (en) | 2013-11-25 | 2013-11-25 | A kind of active radio frequency identification system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310606160.6A CN103605996B (en) | 2013-11-25 | 2013-11-25 | A kind of active radio frequency identification system |
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| Publication Number | Publication Date |
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| CN103605996A CN103605996A (en) | 2014-02-26 |
| CN103605996B true CN103605996B (en) | 2016-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310606160.6A Active CN103605996B (en) | 2013-11-25 | 2013-11-25 | A kind of active radio frequency identification system |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108090529B (en) * | 2016-11-22 | 2021-08-06 | 上海宝信软件股份有限公司 | Method for storing field terminal operation process data based on radio frequency identification technology |
| CN107103259A (en) * | 2017-03-31 | 2017-08-29 | 广州地理研究所 | A kind of jamproof card reader of many cartoon letters of vehicle electron identifying and its application process |
| CN112700632A (en) * | 2020-12-23 | 2021-04-23 | 南方电网电力科技股份有限公司 | Method and system for transmitting wireless metering pulse in multiple channels |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1584910A (en) * | 2004-05-28 | 2005-02-23 | 上海轶龙应用软件开发有限公司 | Electronic label reading method |
| CN101539984A (en) * | 2008-03-20 | 2009-09-23 | 上海锐帆信息科技有限公司 | Realization method for active read-only frequency hopping electronic tags |
| CN102236804A (en) * | 2010-04-23 | 2011-11-09 | 北京烽火联拓科技有限公司 | Reader-writer |
| CN102354370A (en) * | 2011-09-23 | 2012-02-15 | 厦门市英诺尔电子科技有限公司 | RFID (radio frequency identification) ultrahigh-frequency reader-writer containing multichannel antenna expansion circuit |
| CN102799839A (en) * | 2011-05-23 | 2012-11-28 | 成都阿艾夫通信有限公司 | Method for synchronous awakening communication of active RFID (Radio Frequency Identification Devices) system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090257473A1 (en) * | 2008-04-15 | 2009-10-15 | Keystone Technology Solutions, Llc | RFID Fast Hop Frequency Hopping |
-
2013
- 2013-11-25 CN CN201310606160.6A patent/CN103605996B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1584910A (en) * | 2004-05-28 | 2005-02-23 | 上海轶龙应用软件开发有限公司 | Electronic label reading method |
| CN101539984A (en) * | 2008-03-20 | 2009-09-23 | 上海锐帆信息科技有限公司 | Realization method for active read-only frequency hopping electronic tags |
| CN102236804A (en) * | 2010-04-23 | 2011-11-09 | 北京烽火联拓科技有限公司 | Reader-writer |
| CN102799839A (en) * | 2011-05-23 | 2012-11-28 | 成都阿艾夫通信有限公司 | Method for synchronous awakening communication of active RFID (Radio Frequency Identification Devices) system |
| CN102354370A (en) * | 2011-09-23 | 2012-02-15 | 厦门市英诺尔电子科技有限公司 | RFID (radio frequency identification) ultrahigh-frequency reader-writer containing multichannel antenna expansion circuit |
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| CN103605996A (en) | 2014-02-26 |
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