CN102879776B - Radio frequency identification distance measurement or positioning system and method thereof - Google Patents

Radio frequency identification distance measurement or positioning system and method thereof Download PDF

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CN102879776B
CN102879776B CN201210360709.3A CN201210360709A CN102879776B CN 102879776 B CN102879776 B CN 102879776B CN 201210360709 A CN201210360709 A CN 201210360709A CN 102879776 B CN102879776 B CN 102879776B
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time
module
radiofrequency signal
information
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CN102879776A (en
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张学艳
刘振宇
朱坤顺
张海英
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Beijing Zhongke micro Investment Management Co.,Ltd.
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Institute of Microelectronics of CAS
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Abstract

The invention discloses a radio frequency identification distance measurement or positioning system and a method thereof, and belongs to the technical field of radio frequency identification. The system comprises a parameter setting module, a data reading module, a time counting module, a data processing module and an information processing module. By the system, influence of change of obstacles or objects in a space on a radio frequency identification distance measurement or positioning result can be effectively reduced; under the condition that the complicity of the system is not increased, the distance measurement and positioning precision can be greatly improved; furthermore, by adopting a method for measuring counted time when a reader reads a label for many times, the influence of error of delay time of the system on the whole distance measurement and positioning function precision is reduced, and the reliability and the stability of the system are improved.

Description

A kind of radio frequency identification range finding or positioning system and method thereof
Technical field
The invention belongs to radio RF recognition technology field, particularly a kind of radio frequency identification range finding or positioning system and method thereof.
Background technology
Along with the quick rapid development of global economy, the fast development of science and technology, and automobile and smart mobile phone is universal, wireless location technology is gradually improved and is ripe, in the global every field such as production, storage, logistics, traffic and industry, is all widely used.
Aspect outdoor positioning, the technical development of GPS based on satellite communication (GPS) navigational system is very ripe, self-service location and navigation Service from the navigational system in car to personal mobile phone, can realize comparatively accurately location and navigation feature.Horizontal location precision is about 20-30 rice, and theoretical value is 2.93-29 rice, and because earth interior does not have satellite, therefore, its perpendicular positioning precision is on the low side, is only 45-100 rice, if adopt sensor auxiliary, can be improved as 5-10 rice.In the situation that all conditions is good, GPS starts acquisition time and is about 1 minute.
In recent years, along with the growth of China's economy, the scale Rapid Expansion in city, increasing heavy construction emerges, subway system for example, Large Exhibitions building, megastore, museum, library etc.These heavy constructions when the large-scale interior space is provided, have also brought a new difficult problem for an indoor positioning and navigation to us.Yet in these sealings or semi-enclosed interval, gps signal can be weakened by the obstruction of wall or other barriers greatly, cannot locate accurately and navigate.Therefore, we need to study that new wireless location technology makes up that GPS is positioned under indoor environment and high precision situation under deficiency.
At present, be applied to indoor and wireless technology hi-Fix and mainly contain ultrasound wave, infrared ray, bluetooth, WLAN, radio-frequency (RF) identification, ultra broadband and ZigBee etc.In these technology, more successful system is the Cricket system that ultrasound wave and REID are combined, and this system accuracy can reach a centimetre rank, has dropped at present business application.
The receiver being carried by user of Cricket indoor locating system, fixed placement reference mode and the central server in buildings forms.Each reference mode is endowed unique identification code, and to identify the region at self place, forwarding data is to server simultaneously.By the further computing of the complete paired data of server, thus the positioning function of realization.Its data processing utilization be mainly that TDOA(is poor time of arrival) algorithm, be receiver transmitting ultrasonic signal and the radiofrequency signal that hold mobile terminal, near reference mode is received after signal, feedback is with radiofrequency signal and the ultrasonic signal of self-position information, receiver according to the mistiming that receives two kinds of signals, calculate and reference mode between distance, then according to known reference mode position calculation, go out the geographical location information at place, mobile terminal.
This positioning system can solve the location of personnel to self under indoor environment effectively, for the industries such as personnel's trip and logistics provide a great convenience.But, this positioning system can only realize the active location of personnel or vehicle, and cannot realize the passive type location for a large amount of wares, the location of shopping mall's commodity such as the location of showpiece in the location of books in library or museum or supermarket etc.
In fact, the scene of this passive type position application also has a lot, closely bound up with people's life, and in daily life, people have a lot of important article or files usually can forget the place of placement, often require a great deal of time and find with energy.If can these article or file accurately be located, can save a large amount of time, also remove many troubles from.Yet this passive type pilot pin is right is books or the little article carried etc., therefore require for the system of this location must cost lowly and volume is little, be applicable to volume production, be easy to carry about with one and promote.In these above-mentioned wireless location technologies, only have radio-frequency (RF) identification (RFID) technology can meet above requirement.
RFID utilizes radiowave that target is identified and read and write, and its maximum advantage is not need manual intervention, and the data on RFID machine meeting automatic acquisition RFID label are also sent to further application in computer system.This technology is as fast, in real time, accurately gathering and the new and high technology of process information and the basis of information standardization, by universally acknowledged be one of large important technologies in this century ten, at industry-by-industries such as production, retail, logistics, traffic, have broad application prospects.RFID, according to the difference of label, has different application scenarioss.The passive label of RFID is cheap, and the electromagnetic field sending from reader obtains energy, is applicable to short-range location; The active label of RFID comprises battery, and self can provide energy, is applicable to the communication of long distance.
At present, RFID real-time positioning system launches not yet on a large scale for the research under this passive type location scene, is mainly for the research under the scene of active location.The technology that research adopts mainly comprises the location and two kinds of the location that need not find range based on finding range, and wherein, the conventional technology in location based on range finding comprises that received signal strength detects (RSSI) and phase place changes two kinds of detections.These two kinds of technology all can be subject to the disturbing effect in path in signal communication process, cause resultant error larger, and precision is lower, slowly cannot promote.Therefore, we need badly and improve and improve passive type and locate positioning system and the precision under scene.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of radio frequency identification range finding or positioning system and method thereof, has solved the inaccurate problem of positioning precision when wireless radio-frequency is for indoor passive type location in prior art.
For solving the problems of the technologies described above, the invention provides a kind of system of radio frequency identification range finding, comprise that parameter arranges module, data read module, timing module and data processing module, described parameter arranges module for setting the number of times that sends radiofrequency signal, described data read module is according to the number of times of described transmission radiofrequency signal, the information of reader reading tag, described timing module is for when described reader starts reading tag information, the start-of-record time, according to the number of times of described transmission radiofrequency signal, after described reader reading tag end of message (EOM), the end of record (EOR) time, described data processing module is according to the information of described reader reading tag, described start time and described end time, calculate the distance between described label and described reader, described parameter arrange module respectively with described data read module, described timing module is connected by data-interface with described data processing module, described data read module is connected by data-interface with described data processing module with described timing module respectively, described timing module is connected by data-interface with described data processing module.
Further, described system also comprises user interactive module, described user interactive module is connected by data-interface with described data processing module, and described user interactive module shows the distance between the information of described reading tag, described start time, described end time and described label and described reader for figure.
A method for radio frequency identification range finding, comprises the steps:
Step 101: set the number of times that sends radiofrequency signal;
Step 102: according to the number of times of described transmission radiofrequency signal, the information of reader reading tag;
Step 103: when described reader starts reading tag information, the start-of-record time, according to the number of times of described transmission radiofrequency signal, after described reader reading tag end of message (EOM), the end of record (EOR) time;
Step 104: according to the information of described reader reading tag, described start time and described end time, calculate the distance between described label and described reader.
Further, the method for the distance between described calculating label and reader is suc as formula shown in (1) and formula (2):
Δt=(T 0/N)-(ΔT+ΔT 1+ΔT 2+ΔT 3)
(1)
Wherein, T 0for the needed time of process of described reader read operation, N is for sending the number of times of radiofrequency signal, and Δ T is the poor of described end time and described start time, Δ T 1for postponing a period of time, described reader completes the time that the order of transmission radiofrequency signal needs, Δ T 2for described label receives described radiofrequency signal, be converted into the energy of oneself, and return to the time of the process need of electromagnetic signal, Δ T 3for described reader receives from the feedback signal of described label, process until the time of trigger process need, Δ t is the single two-way time of described radiofrequency signal on the travel path between described reader and described label;
S=V*Δt/2
(2)
Wherein, the transmission speed that V is described radiofrequency signal, Δ t is the single two-way time of described radiofrequency signal on the travel path between described reader and described label, S is the distance between described reader and described label.
Further, the method for described range finding also comprises:
Step 105: figure shows the distance between the information of described reading tag, described start time, described end time and described label and described reader.
A system for radio frequency identification range finding, comprises that parameter arranges module, data read module, data analysis module, timing module and data processing module, described parameter arranges module for setting the number of times that sends radiofrequency signal, described data read module is according to the number of times of described transmission radiofrequency signal, the information of reader reading tag, described data analysis module is for adding up the number of described reader reading tag information, described timing module is for when described reader starts reading tag information, the start-of-record time, according to the number of times of described transmission radiofrequency signal, after described reader reading tag end of message (EOM), the end of record (EOR) time, described data processing module is according to the information of described reader reading tag, described start time and described end time, calculate the distance between described label and described reader, then according to geometry location computing method, calculate the position of described label, described parameter arrange module respectively with described data read module, described timing module is connected by data-interface with described data processing module, described data read module is connected by data-interface with described data processing module with described timing module respectively, described data analysis module is connected by data-interface with described timing module respectively at described data read module, described timing module is connected by data-interface with described data processing module.
A method for radio frequency identification location, comprises the steps:
Step 201: set the number of times that sends radiofrequency signal;
Step 202: according to the number of times of described transmission radiofrequency signal, the information of reader reading tag;
Step 203: the number of adding up described reader reading tag information, when the number of described reader reading tag information is greater than 3, directly perform step 204, when the number of described reader reading tag information is less than 3, after postponing a period of time, again send radiofrequency signal, until the number of described reading tag information is greater than more than 3, when repeatedly the number of rear described reader reading tag information is no more than 3, described method finishes to carry out;
Step 204: when described reader starts reading tag information, the start-of-record time, according to the number of times of described transmission radiofrequency signal, after described reader reading tag end of message (EOM), the end of record (EOR) time;
Step 205: according to the information of described reader reading tag, described start time and described end time, calculate the distance between described label and described reader, the position of then calculating described label according to geometry location computing method.
Further, the method for the distance between described calculating label and reader is suc as formula shown in (1) and formula (2):
Δt=(T 0/N)-(ΔT+ΔT 1+ΔT 2+ΔT 3)
(1)
Wherein, T 0for the needed time of process of described reader read operation, N is for sending the number of times of radiofrequency signal, and Δ T is the poor of described end time and described start time, Δ T 1for postponing a period of time, described reader completes the time that the order of transmission radiofrequency signal needs, Δ T 2for described label receives described radiofrequency signal, be converted into the energy of oneself, and return to the time of the process need of electromagnetic signal, Δ T 3for described reader receives from the feedback signal of described label, process until the time of trigger process need, Δ t is the single two-way time of described radiofrequency signal on the travel path between described reader and described label;
S=V*Δt/2
(2)
Wherein, the transmission speed that V is described radiofrequency signal, Δ t is the single two-way time of described radiofrequency signal on the travel path between described reader and described label, S is the distance between described reader and described label.
Further, the method for described location also comprises:
Step 206: figure shows the distance between the information of described reading tag, described start time, described end time and described label and described reader, when method described in described step 203 is carried out end, shows location failure information.
Further, described geometry location computing method comprise any one of three limit localization methods, triangulation location or hyperbolic position method.
A kind of radio frequency identification range finding provided by the invention or positioning system and method thereof, the impact of the variation that can effectively reduce barrier in space or object on radio-frequency (RF) identification range finding or positioning result, in the situation that not increasing system complexity, increase substantially range finding and positioning precision.In addition, the present invention adopts the method for the timing time repeatedly measure reader reading tag, and the impact of the error that has reduced the system delay time on whole range finding and positioning function precision increased the reliability and stability of system.
Accompanying drawing explanation
The method flow diagram that Fig. 1 finds range for a kind of radio frequency identification that the embodiment of the present invention provides;
The method flow diagram that Fig. 2 locates for a kind of radio frequency identification that the embodiment of the present invention provides.
Embodiment
Embodiment 1:
A kind of radio frequency identification range measurement system that the embodiment of the present invention provides, comprises that parameter arranges module, data read module, timing module and data processing module, parameter arranges module for setting the number of times that sends radiofrequency signal, data read module is according to the number of times that sends radiofrequency signal, the information of reader reading tag, timing module is for when reader starts reading tag information, the start-of-record time, according to the number of times that sends radiofrequency signal, after reader reading tag end of message (EOM), the end of record (EOR) time, data processing module is according to the information of reader reading tag, start time and end time, calculate the distance between label and reader, parameter arrange module respectively with data read module, timing module is connected by data-interface with data processing module, data read module is connected by data-interface with data processing module with timing module respectively, timing module is connected by data-interface with data processing module.In embodiments of the present invention, can by user and can be for the client of its operation, for carrying out the information server of information interaction and processing, the reader that the measured object of label is housed and is integrated with clocking capability is realized, be specially: reader, client and information server are communicated by letter by LAN (Local Area Network) or other modes, wherein, two readers can all cover three Tag.This example is chosen wherein a kind of situation, for example, measure reader 1 and indicate the distance between the books of Tag2.
Wherein, this system can also comprise user interactive module, user interactive module is connected by data-interface with data processing module, and user interactive module shows information, start time, end time and the label of reading tag and the distance between reader for figure.
Referring to Fig. 1, a kind of method of radio frequency identification range finding, comprises the steps:
Step 101: set the number of times that sends radiofrequency signal;
Step 102: according to the number of times that sends radiofrequency signal, the information of reader reading tag;
Step 103: when reader starts reading tag information, the start-of-record time, according to the number of times that sends radiofrequency signal, after reader reading tag end of message (EOM), the end of record (EOR) time;
Step 104: according to the information of reader reading tag, start time and end time, calculate the distance between label and reader.
In embodiments of the present invention, when range finding starts, user, in the setting of the enterprising line correlation ranging parameters of client, wants the target object of finding range comprising times N and the selection of reader reading tag---post the books of Tag2.After parameter setting completes, client sends to information server by LAN (Local Area Network) or other communication modes by set information.
After information server receives parameter from client and arranges, beginning sends broadcast to the reader in scope, and start the Tag2 in scope to read, if can not read the id information of Tag2, information server random delay is after a period of time, again to the reader in network, send broadcast, if repeating said process surpasses after 5 times, still cannot read the id information of Tag2, information server directly returns to client the order that range finding is failed, then waits for distance measurement request next time.
If successfully read the id information of Tag2, when starting to carry out to read for N time the id information of Tag2, start timing, until after reading the id information of Tag2 for N time, stop timing, required time is T 0.Default receives after the return message from label, postpones the time of Δ T.The time that reader delay a period of time completes the order of transmission radiofrequency signal to be needed is designated as Δ T 1; Label receives radiofrequency signal, is converted into the energy of oneself, and the time of returning to the process need of electromagnetic signal is designated as Δ T 2; Reader receives from the feedback signal of label and processes until the time of trigger process need is designated as Δ T 3.
Wherein, Δ T 1, Δ T 2with Δ T 3therefore being the system delay time, is its build-in attribute, and the difference with label information does not change, and can draw by experiment measuring in advance.So the single of radiofrequency signal on the travel path between reader and label is two-way time
Δt=(T 0/N)-(ΔT+ΔT 1+ΔT 2+ΔT 3)
The distance that can calculate between reader and label thus, is
S=V*Δt/2
Wherein, V is that radiofrequency signal is also electromagnetic speed, i.e. V=3 * 10 8m/s.
This computation process is carried out by information server, draws after result of calculation, and information server sends to result in user's client by LAN (Local Area Network) or other connected modes, then waits for the client distance measurement request of next time.
Wherein, the method for this range finding also comprises:
Step 105: figure shows information, start time, end time and the label of reading tag and the distance between reader.
Embodiment 2:
A system for radio frequency identification range finding, comprises that parameter arranges module, data read module, data analysis module, timing module and data processing module, parameter arranges module for setting the number of times that sends radiofrequency signal, data read module is according to the number of times that sends radiofrequency signal, the information of reader reading tag, data analysis module is for adding up the number of reader reading tag information, timing module is for when reader starts reading tag information, the start-of-record time, according to the number of times that sends radiofrequency signal, after reader reading tag end of message (EOM), the end of record (EOR) time, described data processing module is according to the information of reader reading tag, start time and end time, calculate the distance between label and reader, then according to geometry location computing method, calculate the position of described label, parameter arrange module respectively with data read module, timing module is connected by data-interface with data processing module, data read module is connected by data-interface with data processing module with timing module respectively, data analysis module is connected by data-interface with institute timing module respectively at data read module, timing module is connected by data-interface with data processing module.In embodiments of the present invention, can and can supply the client of its operation by user, for the information server that carries out information interaction and processing, 3 object to be positioned and 8 readers that are integrated with clocking capability that label is housed, reader, client and information server are communicated by letter by LAN (Local Area Network) or other modes, and wherein, the layout rules of a plurality of readers is, in its coverage, any one object with label can be read by least three readers.This example is chosen wherein a kind of situation, the positional information of the books that for example location indicates Tag2 in space.
Referring to Fig. 2, the method for a kind of radio frequency identification location, comprises the steps:
Step 201: set the number of times that sends radiofrequency signal;
Step 202: according to the number of times that sends radiofrequency signal, the information of reader reading tag;
Step 203: the number of statistics reader reading tag information, when the number of reader reading tag information is greater than 3, directly perform step 204, when the number of reader reading tag information is less than 3, after postponing a period of time, again send radiofrequency signal, until the number of reading tag information is greater than more than 3, when repeatedly the number of rear reader reading tag information is no more than 3, method finishes to carry out;
Step 204: when reading tag information, the start-of-record time, according to the number of times that sends radiofrequency signal, after reading tag end of message (EOM), the end of record (EOR) time;
Step 205: according to the information of reading tag, start time and end time, calculate the distance between label and reader, then calculate the position of label according to geometry location computing method.
Wherein, the method for calculating the distance between label and reader is suc as formula shown in (1) and formula (2):
Δt=(T 0/N)-(ΔT+ΔT 1+ΔT 2+ΔT 3)
(1)
Wherein, T 0for the needed time of process of reader read operation, N is for sending the number of times of radiofrequency signal, and Δ T is the poor of end time and start time, Δ T 1for postponing a period of time, reader completes the time that the order of transmission radiofrequency signal needs, Δ T 2for label receives described radiofrequency signal, be converted into the energy of oneself, and return to the time of the process need of electromagnetic signal, Δ T 3for reader receives from the feedback signal of label, process until the time of trigger process need, Δ t is the single two-way time of radiofrequency signal on the travel path between reader and label;
S=V*Δt/2
(2)
Wherein, the transmission speed that V is radiofrequency signal, S is the distance between reader and label.
Wherein, the method for this location also comprises:
Step 206: figure shows information, start time, end time and the label of reading tag and the distance between reader, in step 203, method is carried out while finishing, and shows location failure information.
Wherein, these geometry location computing method comprise any in three limit localization methods, triangulation location or hyperbolic position method also can comprise any one that these location algorithms are derived.
In the embodiment of the present invention, when location starts, user is in the setting of the enterprising line correlation positional parameter of client, and while finding range comprising single, the target object of location is wanted in the times N of reader reading tag and selection---post the books of Tag2.After parameter setting completes, client sends to information server by LAN (Local Area Network) or other communication modes by set information.
After information server receives parameter from client and arranges, beginning sends broadcast to 8 readers in scope, and start the Tag2 in coverage to read, if all readers can not read the id information of Tag2, information server random delay is after a period of time, again to the reader in network, send broadcast, if repeating said process surpasses after 5 times, still cannot read the id information of Tag2, information server, directly to the order of client restoring to normal position failure, is then waited for the request of location next time.
If there is reader successfully to read the id information of Tag2, but the total number of the reader that can read is less than 3, information server random delay a period of time still, then continue broadcast, if number of broadcast times is over 5 times, information server directly, to the order of client restoring to normal position failure, is then waited for Location Request next time.
If read the number of reader of the id information of Tag2, be greater than 3, start to carry out follow-up position fixing process:
First, information server is random in the reader of all id informations that can read Tag2 selects one to start range finding, and these readers are designated as to effective reading device.
Secondly, the reader of time set is housed, when starting to carry out to read for N time the id information of Tag2, starts timing, until after reading the id information of Tag2 for N time, stop timing, required time is T0.
The 3rd, this reader sends to this clocking information in information server by LAN (Local Area Network) or other communication modes, carries out data processing work.
Then, information server random delay a period of time, the random ranging process of selecting second and the 3rd of a repetition in remaining effective reading device, and repeat this process, until all effective reading devices have all completed ranging process, and information is turned back in information server.
Then, the chronometric data that information server returns to each effective reading device is according to the distance Computing Principle in example explanation 1, processes the distance obtaining between object that each effective reading device and Tag2 identify, and deposits in database.
Finally, information server, according to the result calculating in above-mentioned steps, utilizes three limit localization methods again to process, and obtains the spatial positional information of object that Tag2 identifies.And this information exchange is crossed to LAN (Local Area Network) or other communication modes send in user's client.Then wait for client distance measurement request next time.
The present invention is directed to and utilize the process that RFID technology finds range and utilize the ranging process of RFID technology in positioning, adopt the RFID positioning system of the method, the variation of surrounding environment or the impact of the existence of barrier on system accuracy have been reduced, in addition, adopting the method for asking the single time of repeatedly measuring, is in order to reduce the impact of the existence of system delay error on precision.Therefore, the invention enables RFID location technology to there is higher precision and application scenarios widely.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to example, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.

Claims (10)

1. a system for radio frequency identification range finding, is characterized in that, comprises that parameter arranges module, data read module, timing module and data processing module, described parameter arranges module for setting the number of times that sends radiofrequency signal, described data read module is used for reader according to the number of times of described transmission radiofrequency signal, the information of reading tag, described timing module is for when described reader starts reading tag information, the start-of-record time, according to the number of times of described transmission radiofrequency signal, after described reader reading tag end of message (EOM), the end of record (EOR) time, described data processing module is according to the information of described reader reading tag, described start time and described end time, calculate the distance between described label and described reader, described parameter arrange module respectively with described data read module, described timing module is connected by data-interface with described data processing module, described data read module is connected by data-interface with described data processing module with described timing module respectively, described timing module is connected by data-interface with described data processing module.
2. system according to claim 1, it is characterized in that, described system also comprises user interactive module, described user interactive module is connected by data-interface with described data processing module, and described user interactive module shows the distance between the information of described reading tag, described start time, described end time and described label and described reader for figure.
3. a method for radio frequency identification range finding, is characterized in that, comprises the steps:
Step 101: set the number of times that sends radiofrequency signal;
Step 102: according to the number of times of described transmission radiofrequency signal, the information of reader reading tag;
Step 103: when described reader starts reading tag information, the start-of-record time, according to the number of times of described transmission radiofrequency signal, after described reader reading tag end of message (EOM), the end of record (EOR) time;
Step 104: according to the information of described reader reading tag, described start time and described end time, calculate the distance between described label and described reader.
4. method according to claim 3, is characterized in that, the method for the distance between described calculating label and reader is suc as formula shown in (1) and formula (2):
Δt=(T 0/N)-(ΔT+ΔT 1+ΔT 2+ΔT 3)
(1)
Wherein, T 0for the needed time of process of described reader read operation, N is for sending the number of times of radiofrequency signal, and Δ T is the poor of described end time and described start time, Δ T 1for postponing a period of time, described reader completes the time that the order of transmission radiofrequency signal needs, Δ T 2for described label receives described radiofrequency signal, be converted into the energy of oneself, and return to the time of the process need of electromagnetic signal, Δ T 3for described reader receives from the feedback signal of described label, process until the time of trigger process need, Δ t is the single two-way time of described radiofrequency signal on the travel path between described reader and described label;
S=V*Δt/2
(2)
Wherein, the transmission speed that V is described radiofrequency signal, Δ t is the single two-way time of described radiofrequency signal on the travel path between described reader and described label, S is the distance between described reader and described label.
5. method according to claim 3, is characterized in that, the method for described range finding also comprises:
Step 105: figure shows the distance between the information of described reading tag, described start time, described end time and described label and described reader.
6. a system for radio frequency identification range finding, is characterized in that, comprises that parameter arranges module, data read module, data analysis module, timing module and data processing module, described parameter arranges module for setting the number of times that sends radiofrequency signal, described data read module is used for reader according to the number of times of described transmission radiofrequency signal, the information of reading tag, described data analysis module is for adding up the number of described reader reading tag information, described timing module is for when described reader starts reading tag information, the start-of-record time, according to the number of times of described transmission radiofrequency signal, after described reader reading tag end of message (EOM), the end of record (EOR) time, described data processing module is according to the information of described reader reading tag, described start time and described end time, calculate the distance between described label and described reader, then according to geometry location computing method, calculate the position of described label, described parameter arrange module respectively with described data read module, described timing module is connected by data-interface with described data processing module, described data read module is connected by data-interface with described data processing module with described timing module respectively, described data analysis module is connected by data-interface with described timing module with described data read module respectively, described timing module is connected by data-interface with described data processing module.
7. a method for radio frequency identification location, is characterized in that, comprises the steps:
Step 201: set the number of times that sends radiofrequency signal;
Step 202: according to the number of times of described transmission radiofrequency signal, the information of reader reading tag;
Step 203: the number of adding up described reader reading tag information, when the number of described reader reading tag information is greater than 3, directly perform step 204, when the number of described reader reading tag information is less than 3, after postponing a period of time, again send radiofrequency signal, until the number of described reading tag information is greater than more than 3, when repeatedly the number of rear described reader reading tag information is no more than 3, described method finishes to carry out;
Step 204: when described reader starts reading tag information, the start-of-record time, according to the number of times of described transmission radiofrequency signal, after described reader reading tag end of message (EOM), the end of record (EOR) time;
Step 205: according to the information of described reader reading tag, described start time and described end time, calculate the distance between described label and described reader, the position of then calculating described label according to geometry location computing method.
8. method according to claim 7, is characterized in that, the method for the distance between described calculating label and reader is suc as formula shown in (1) and formula (2):
Δt=(T 0/N)-(ΔT+ΔT 1+ΔT 2+ΔT 3)
(1)
Wherein, T 0for the needed time of process of described reader read operation, N is for sending the number of times of radiofrequency signal, and Δ T is the poor of described end time and described start time, Δ T 1for postponing a period of time, described reader completes the time that the order of transmission radiofrequency signal needs, Δ T 2for described label receives described radiofrequency signal, be converted into the energy of oneself, and return to the time of the process need of electromagnetic signal, Δ T 3for described reader receives from the feedback signal of described label, process until the time of trigger process need, Δ t is the single two-way time of described radiofrequency signal on the travel path between described reader and described label;
S=V*Δt/2
(2)
Wherein, the transmission speed that V is described radiofrequency signal, Δ t is the single two-way time of described radiofrequency signal on the travel path between described reader and described label, S is the distance between described reader and described label.
9. method according to claim 7, is characterized in that, the method for described location also comprises:
Step 206: figure shows the distance between the information of described reading tag, described start time, described end time and described label and described reader, when method described in described step 203 is carried out end, shows location failure information.
10. method according to claim 7, is characterized in that, described geometry location computing method comprise any one of three limit localization methods, triangulation location or hyperbolic position method.
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CN103251194B (en) * 2013-05-08 2016-10-26 创世树有限公司 A kind of anti-theft luggage case
CN103415073B (en) * 2013-08-26 2017-03-01 中国科学技术大学苏州研究院 Indoor orientation method based on RFID label tag stabilization
BR102014010722B1 (en) * 2014-05-05 2022-09-27 União Brasileira De Educação E Assistência SYSTEM AND METHOD FOR LOCATION OF SPATIAL OBJECTS COORDINATES AND USE OF SUCH SYSTEM FOR LOCATION OF OBJECTS DISPOSED IN INTERNAL ENVIRONMENTS
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CN114839660A (en) * 2022-03-11 2022-08-02 南京市地铁交通设施保护办公室 Hybrid positioning system based on GPS and RFID

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1790371A (en) * 2004-12-17 2006-06-21 香港理工大学 Reference positioning system employing RF recognition technology
US20110181422A1 (en) * 2006-06-30 2011-07-28 Bao Tran Personal emergency response (per) system
CN102306264A (en) * 2011-06-02 2012-01-04 西安理工大学 Radio frequency identification (RFID)-technology-based indoor positioning system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5371910B2 (en) * 2010-08-26 2013-12-18 株式会社神戸製鋼所 Member position management system and member position management method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1790371A (en) * 2004-12-17 2006-06-21 香港理工大学 Reference positioning system employing RF recognition technology
US20110181422A1 (en) * 2006-06-30 2011-07-28 Bao Tran Personal emergency response (per) system
CN102306264A (en) * 2011-06-02 2012-01-04 西安理工大学 Radio frequency identification (RFID)-technology-based indoor positioning system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JP特开2012-47572A 2012.03.08

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