CN102879776A - Radio frequency identification ranging or positioning system and method thereof - Google Patents
Radio frequency identification ranging or positioning system and method thereof Download PDFInfo
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Abstract
The invention discloses a radio frequency identification distance measurement or positioning system and a method thereof, belonging to the technical field of radio frequency identification. The system comprises a parameter setting module, a data reading module, a timing module, a data processing module and an information processing module. The invention can effectively reduce the influence of the change of the obstacles or objects in the space on the radio frequency identification distance measurement or positioning result, and greatly improve the distance measurement and positioning precision under the condition of not increasing the complexity of the system. In addition, the invention adopts a method for measuring the timing time for reading the label by the reader for multiple times, reduces the influence of the error of the delay time of the system on the precision of the whole ranging and positioning functions, and increases the reliability and the stability of the system.
Description
Technical field
The invention belongs to the 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 the popularizing of automobile and smart mobile phone, wireless location technology is gradually improved and is ripe, all is widely used in the global every field such as production, storage, logistics, traffic and industry.
Aspect outdoor positioning, GPS (GPS) navigational system technical development based on satellite communication is very ripe, self-service location and navigation Service from the navigational system in the car to personal mobile phone can realize comparatively accurately locating and navigation feature.The horizontal location precision is about 20-30 rice, and theoretical value is 2.93-29 rice, because earth interior does not have satellite, therefore, its perpendicular positioning precision is on the low side, only is 45-100 rice, if adopt sensor auxiliary, can be improved as 5-10 rice.In the good situation of all conditions, 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 have also brought the new difficult problem of an indoor positioning and navigation when the large-scale interior space is provided to us.Yet in these sealings or semi-enclosed interval, gps signal can be weakened by the obstruction of wall or other barriers greatly, can't locate accurately and navigate.Therefore, we need to study that new wireless location technology remedies that GPS is positioned under the indoor environment and the 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.More successful system is the Cricket system that ultrasound wave and REID are combined in these technology, and this system accuracy can reach a centimetre rank, has dropped at present commercial the application.
The receiver, reference mode and the central server of fixed placement in buildings that are carried by the user of Cricket indoor locating system form.Each reference mode is endowed unique identification code, and to identify the zone at self place, forwarding data is to server simultaneously.By the further computing of the complete paired data of server, thereby realize positioning function.Its data processing and utilizing mainly be that TDOA(is poor time of arrival) algorithm, be receiver emission ultrasonic signal and the radiofrequency signal that hold the mobile terminal, after near reference mode is received signal, feedback is with radiofrequency signal and the ultrasonic signal of self-position information, receiver calculate according to the mistiming that receives two kinds of signals and reference mode between distance, then go out the geographical location information at place, mobile terminal according to known reference mode position calculation.
This positioning system can solve under the indoor environment personnel effectively to the location of self, 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 can't realize for the passive type of a large amount of wares location the location of shopping mall's commodity such as the location of showpiece in the location of books in the library or the museum or supermarket etc.
In fact, the scene of this passive type position application also has a lot, and is closely bound up with people's life, and in daily life, the place that people have much important article or file usually can forget placement often requires a great deal of time and energy is sought.If can accurately locate these article or file, 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., and it is must cost low and volume is little therefore to require to be used for the system of this location, is fit to volume production, is easy to carry about with one and promotes.In these above-mentioned wireless location technologies, only have radio-frequency (RF) identification (RFID) technology can satisfy 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 the RFID machine meeting automatic acquisition RFID label also are sent to further application in the 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, have broad application prospects at industry-by-industries such as production, retail, logistics, traffic.RFID has different application scenarioss according to the difference of label.The passive label of RFID is cheap, and the electromagnetic field that sends 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, the RFID real-time positioning system launches not yet on a large scale for the research under this passive type location scene, mainly is for the research under the scene of active location.The technology that research is adopted mainly comprises the location and two kinds of the location that need not find range based on range finding, wherein, comprises that based on the location of range finding technology commonly used received signal strength detects (RSSI) and phase place changes two kinds of detections.These two kinds of technology all can be subjected to the disturbing effect in path in the signal communication process, cause resultant error larger, and precision is lower, slowly can't promote.Therefore, we need positioning system and precision under perfect and the raising passive type location scene badly.
Summary of the invention
Technical matters to be solved by this invention provides a kind of radio frequency identification range finding or positioning system and method thereof, has solved the inaccurate problem of bearing accuracy when wireless radio-frequency is for indoor passive type location in the 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 and is used 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 used for when described reader begins reading tag information, the start-of-record time, number of times according to described transmission radiofrequency signal, behind the 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 concluding time, calculate the distance between described label and the described reader, described parameter arrange module respectively with described data read module, described timing module links to each other by data-interface with described data processing module, described data read module links to each other by data-interface with described data processing module with described timing module respectively, and described timing module links to each other by data-interface with described data processing module.
Further, described system also comprises user interactive module, described user interactive module links to each other by data-interface with described data processing module, and described user interactive module is used for figure and shows distance between the information of described reading tag, described start time, described concluding time and described label and the described reader.
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 of described transmission radiofrequency signal, the information of reader reading tag;
Step 103: when described reader begins reading tag information, the start-of-record time, according to the number of times of described transmission radiofrequency signal, behind the 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 concluding time, calculate the distance between described label and the described reader.
Further, the method for the distance between described calculating label and the reader is suc as formula shown in (1) and the formula (2):
Δt=(T
0/N)-(ΔT+ΔT
1+ΔT
2+ΔT
3)
（1）
Wherein, T
0Be the needed time of the 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 concluding time and described start time, Δ T
1For postponing a period of time, described reader finishes 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 the time of the process need of electromagnetic signal, Δ T
3Process until the time of trigger process need for described reader receives from the feedback signal of described label, Δ t is the single two-way time of described radiofrequency signal on the travel path between described reader and the described label;
S=V*Δt/2
（2）
Wherein, V is the transmission speed of described radiofrequency signal, and Δ t is the single two-way time of described radiofrequency signal on the travel path between described reader and the described label, and S is the distance between described reader and the 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 concluding time and described label and the described reader.
A kind of system of 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 and is used 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 used for adding up the number of described reader reading tag information, described timing module is used for when described reader begins reading tag information, the start-of-record time, number of times according to described transmission radiofrequency signal, behind the 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 concluding time, calculate the distance between described label and the described reader, then calculate the position of described label according to the geometry location computing method, described parameter arrange module respectively with described data read module, described timing module links to each other by data-interface with described data processing module, described data read module links to each other by data-interface with described data processing module with described timing module respectively, described data analysis module links to each other by data-interface with described timing module respectively at described data read module, and described timing module links to each other by data-interface with described data processing module.
The method of 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 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 greater than 3 the time, direct execution in step 204, when the number of described reader reading tag information less than 3 the time, again send radiofrequency signal after then postponing a period of time, until the number of described reading tag information is greater than more than 3, when the number of described reader reading tag information was no more than 3 after repeatedly, described method finished to carry out;
Step 204: when described reader begins reading tag information, the start-of-record time, according to the number of times of described transmission radiofrequency signal, behind the 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 concluding time, calculate the distance between described label and the described reader, then calculate the position of described label according to the geometry location computing method.
Further, the method for the distance between described calculating label and the reader is suc as formula shown in (1) and the formula (2):
Δt=(T
0/N)-(ΔT+ΔT
1+ΔT
2+ΔT
3)
（1）
Wherein, T
0Be the needed time of the 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 concluding time and described start time, Δ T
1For postponing a period of time, described reader finishes 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 the time of the process need of electromagnetic signal, Δ T
3Process until the time of trigger process need for described reader receives from the feedback signal of described label, Δ t is the single two-way time of described radiofrequency signal on the travel path between described reader and the described label;
S=V*Δt/2
（2）
Wherein, V is the transmission speed of described radiofrequency signal, and Δ t is the single two-way time of described radiofrequency signal on the travel path between described reader and the described label, and S is the distance between described reader and the 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 concluding time and described label and the described reader, when method described in the described step 203 is carried out end, shows the 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, can effectively reduce the variation of barrier in the space or object to the impact of radio-frequency (RF) identification range finding or positioning result, in the situation that does not increase system complexity, increase substantially range finding and bearing accuracy.In addition, the present invention adopts the method for the timing time of repeatedly measuring the reader reading tag, has reduced the error of system delay time to the impact of whole range finding and positioning function precision, has increased the reliability and stability of system.
Description of drawings
The method flow diagram that Fig. 1 finds range for a kind of radio frequency identification that the embodiment of the invention provides;
The method flow diagram that Fig. 2 locates for a kind of radio frequency identification that the embodiment of the invention provides.
Embodiment
Embodiment 1:
A kind of radio frequency identification range measurement system that the embodiment of the invention provides comprises that parameter arranges module, data read module, timing module and data processing module; Parameter arranges module and is used 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 used for when reader begins reading tag information, the start-of-record time, according to the number of times that sends radiofrequency signal, behind the 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 concluding time, calculate the distance between label and the reader, parameter arrange module respectively with data read module, timing module links to each other by data-interface with data processing module, data read module links to each other by data-interface with data processing module with timing module respectively, and timing module links to each other by data-interface with data processing module.In embodiments of the present invention, can and can realize for the client of its operation, the information server that is used for carrying out information interaction and processing, the reader that the measured object of label is housed and is integrated with clocking capability by the user, 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 measures reader 1 and indicates distance between the books of Tag2.
Wherein, this system can also comprise user interactive module, user interactive module links to each other by data-interface with data processing module, and user interactive module is used for figure and shows information, start time, concluding time and the label of reading tag and the distance between the reader.
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 begins reading tag information, the start-of-record time, according to the number of times that sends radiofrequency signal, behind the reader reading tag end of message (EOM), the end of record (EOR) time;
Step 104: according to information, start time and the concluding time of reader reading tag, calculate the distance between label and the reader.
In embodiments of the present invention, when beginning range finding, the user is in the setting of the enterprising line correlation ranging parameters of client, comprising the times N of reader reading tag with select to want the target object of finding range---post the books of Tag2.After the parameter setting was finished, client sent to information server by LAN (Local Area Network) or other communication modes with set information.
After information server receives parameter from client and arranges, beginning sends broadcasting to the reader in the scope, and begin the Tag2 in the scope is read, if can not read the id information of Tag2, then the information server random delay is after a period of time, reader in the network sends broadcasting again, after if the repetition said process surpasses 5 times, still can't read the id information of Tag2, then information server directly returns the failed order of range finding to client, then waits for distance measurement request next time.
If successfully read the id information of Tag2, then when beginning to carry out to read for N time the id information of Tag2, begin timing, until read for N time after the id information of Tag2, stop timing, required time is T
0After default receives return message from label, postpone the time of Δ T.The time that reader delay a period of time is finished the order of transmission radiofrequency signal to be needed is designated as Δ T
1Label receives radiofrequency signal, is converted into the energy of oneself, and the time of returning the process need of electromagnetic signal is designated as Δ T
2Reader 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 the label is two-way time
Δt=(T
0/N)-(ΔT+ΔT
1+ΔT
2+ΔT
3)
The distance that can calculate between reader and the label thus, is
S=V*Δt/2
Wherein, V is that radiofrequency signal also is electromagnetic speed, i.e. V=3 * 10
8M/s.
This computation process is carried out by information server, draw result of calculation after, information server sends to the result on user's the 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, concluding time and the label of reading tag and the distance between the reader.
Embodiment 2:
A kind of system of 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 and is used 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 used for the number of statistics reader reading tag information, timing module is used for when reader begins reading tag information, the start-of-record time, according to the number of times that sends radiofrequency signal, behind the 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 concluding time, calculate the distance between label and the reader, then calculate the position of described label according to the geometry location computing method, parameter arrange module respectively with data read module, timing module links to each other by data-interface with data processing module, data read module links to each other by data-interface with data processing module with timing module respectively, data analysis module links to each other by data-interface with the institute timing module respectively at data read module, and timing module links to each other by data-interface with data processing module.In embodiments of the present invention, can and can supply the client of its operation by the 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 at least three readers.This example is chosen wherein a kind of situation, and for example the location indicates the positional information of books in the space of Tag2.
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 greater than 3 the time, direct execution in step 204, when the number of reader reading tag information less than 3 the time, again send radiofrequency signal after then postponing a period of time, until the number of reading tag information is greater than more than 3, when the number of reader reading tag information was no more than 3 after repeatedly, method finished to carry out;
Step 204: when reading tag information, the start-of-record time, according to the number of times that sends radiofrequency signal, behind the reading tag end of message (EOM), the end of record (EOR) time;
Step 205: according to information, start time and the concluding time of reading tag, calculate the distance between label and the reader, then calculate the position of label according to the geometry location computing method.
Wherein, the method for the distance between calculating label and the reader is suc as formula shown in (1) and the formula (2):
Δt=(T
0/N)-(ΔT+ΔT
1+ΔT
2+ΔT
3)
（1）
Wherein, T
0Be the needed time of the process of reader read operation, N is for sending the number of times of radiofrequency signal, and Δ T is the poor of concluding time and start time, Δ T
1For postponing a period of time, reader finishes 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 the time of the process need of electromagnetic signal, Δ T
3Process until the time of trigger process need for reader receives from the feedback signal of label, Δ t is the single two-way time of radiofrequency signal on the travel path between reader and the label;
S=V*Δt/2
（2）
Wherein, V is the transmission speed of radiofrequency signal, and S is the distance between reader and the label.
Wherein, the method for this location also comprises:
Step 206: figure shows information, start time, concluding time and the label of reading tag and the distance between the reader, when method in the step 203 is carried out end, shows the location failure information.
Wherein, these geometry location computing method comprise any in three limit localization methods, triangulation location or the hyperbolic position method also can comprise any one that these location algorithms are derived.
In the embodiment of the invention, when beginning location, the user is in the setting of the enterprising line correlation positional parameter of client, and the target object of locating is wanted in the times N of reader reading tag and selection when find range comprising single---post the books of Tag2.After the parameter setting was finished, client sent to information server by LAN (Local Area Network) or other communication modes with set information.
After information server receives parameter from client and arranges, beginning sends broadcasting to 8 readers in the scope, and begin the Tag2 in the coverage is read, if all readers can not read the id information of Tag2, then the information server random delay is after a period of time, reader in the network sends broadcasting again, after if the repetition said process surpasses 5 times, still can't read the id information of Tag2, then 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, then continue broadcasting, if number of broadcast times is above 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 id information of Tag2 greater than 3, then begin to carry out follow-up position fixing process:
At first, information server selects one to begin range finding in all can read the reader of id information of Tag2 at random, and these readers are designated as the effective reading device.
Secondly, the reader of time set is housed, begins timing when beginning to carry out to read for N time the id information of Tag2, until read for N time after the id information of Tag2, stop timing, required time is T0.
The 3rd, this reader sends to this clocking information in the 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, in remaining effective reading device, select at random a ranging process that repeats second and the 3rd one, and repeat this process, until all effective reading devices have all been finished ranging process, and information is turned back in the information server.
Then, the chronometric data that information server returns each effective reading device according in the example explanation 1 apart from Computing Principle, process the distance that obtains between the object that each effective reading device and Tag2 identify, and deposit in the database.
At last, information server utilizes three limit localization methods again to process according to the result who calculates in the above-mentioned steps, obtains the spatial positional information of object that Tag2 identifies.And this information exchange crossed LAN (Local Area Network) or other communication modes send on user's the client.Then wait for client distance measurement request next time.
The present invention is directed to and utilize the process that the RFID technology finds range and utilize the ranging process of RFID technology in positioning, adopt the RFID positioning system of the method, reduced the existence of the variation of surrounding environment or barrier to the impact of system accuracy, in addition, adopting the method for asking the single time of repeatedly measuring, is for the existence that reduces the system delay error impact on precision.Therefore, the invention enables the RFID location technology to have 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 with reference to example the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1. the system of a 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 and is used 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 used for when described reader begins reading tag information, the start-of-record time, number of times according to described transmission radiofrequency signal, behind the 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 concluding time, calculate the distance between described label and the described reader, described parameter arrange module respectively with described data read module, described timing module links to each other by data-interface with described data processing module, described data read module links to each other by data-interface with described data processing module with described timing module respectively, and described timing module links to each other 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 links to each other by data-interface with described data processing module, and described user interactive module is used for figure and shows distance between the information of described reading tag, described start time, described concluding time and described label and the described reader.
3. the method for a 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 begins reading tag information, the start-of-record time, according to the number of times of described transmission radiofrequency signal, behind the 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 concluding time, calculate the distance between described label and the described reader.
4. method according to claim 3 is characterized in that, the method for the distance between described calculating label and the reader is suc as formula shown in (1) and the formula (2):
Δt=(T
0/N)-(ΔT+ΔT
1+ΔT
2+ΔT
3)
（1）
Wherein, T
0Be the needed time of the 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 concluding time and described start time, Δ T
1For postponing a period of time, described reader finishes 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 the time of the process need of electromagnetic signal, Δ T
3Process until the time of trigger process need for described reader receives from the feedback signal of described label, Δ t is the single two-way time of described radiofrequency signal on the travel path between described reader and the described label;
S=V*Δt/2
（2）
Wherein, V is the transmission speed of described radiofrequency signal, and Δ t is the single two-way time of described radiofrequency signal on the travel path between described reader and the described label, and S is the distance between described reader and the 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 concluding time and described label and the described reader.
6. the system of a 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 and is used 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 used for adding up the number of described reader reading tag information, described timing module is used for when described reader begins reading tag information, the start-of-record time, number of times according to described transmission radiofrequency signal, behind the 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 concluding time, calculate the distance between described label and the described reader, then calculate the position of described label according to the geometry location computing method, described parameter arrange module respectively with described data read module, described timing module links to each other by data-interface with described data processing module, described data read module links to each other by data-interface with described data processing module with described timing module respectively, described data analysis module links to each other by data-interface with described timing module respectively at described data read module, and described timing module links to each other by data-interface with described data processing module.
7. the method for a 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 greater than 3 the time, direct execution in step 204, when the number of described reader reading tag information less than 3 the time, again send radiofrequency signal after then postponing a period of time, until the number of described reading tag information is greater than more than 3, when the number of described reader reading tag information was no more than 3 after repeatedly, described method finished to carry out;
Step 204: when described reader begins reading tag information, the start-of-record time, according to the number of times of described transmission radiofrequency signal, behind the 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 concluding time, calculate the distance between described label and the described reader, then calculate the position of described label according to the geometry location computing method.
8. method according to claim 7 is characterized in that, the method for the distance between described calculating label and the reader is suc as formula shown in (1) and the formula (2):
Δt=(T
0/N)-(ΔT+ΔT
1+ΔT
2+ΔT
3)
（1）
Wherein, T
0Be the needed time of the 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 concluding time and described start time, Δ T
1For postponing a period of time, described reader finishes 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 the time of the process need of electromagnetic signal, Δ T
3Process until the time of trigger process need for described reader receives from the feedback signal of described label, Δ t is the single two-way time of described radiofrequency signal on the travel path between described reader and the described label;
S=V*Δt/2
（2）
Wherein, V is the transmission speed of described radiofrequency signal, and Δ t is the single two-way time of described radiofrequency signal on the travel path between described reader and the described label, and S is the distance between described reader and the 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 concluding time and described label and the described reader, when method described in the described step 203 is carried out end, shows the 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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