CN102279398B - Radio frequency label positioning system and radio frequency label positioning method - Google Patents
Radio frequency label positioning system and radio frequency label positioning method Download PDFInfo
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Abstract
A radio frequency label positioning system is used for executing the radio frequency label positioning method. The radio frequency label positioning system comprises a radio frequency label, at least one reader and a backend server. A radio frequency label periodically sends multiple label signals having different original signal strengths, and the original signal strength of each label signal determines a massage receiving boundary relative to the radio frequency label. The reader is used for reading the label signals, and the label signal capable of being received by the reader is the receivable signal. The backend server determines the possible position scope of the radio frequency label relative to the reader, according to the massage receiving boundary corresponding to the receivable signal.
Description
Technical field
The present invention is relevant with location technology, particularly localization method and the system of a kind of application radio frequency identification technique (RFID).
Background technology
Frequency identification system (RFID) is widely used radio wave transmissions signalling technique gradually in recent years, and its front end basic framework is the radio wave transmissions network that is comprised of receiving end (Reader) and radio-frequency (RF) tag (RFID Tag).
The radio-frequency (RF) tag location is one of application of frequency identification system, as shown in Figure 1, RFID positioning system in the known technology, to send a label signal with a radio-frequency (RF) tag 10, receive these label signals by reader 20 again, and judge the distance of 20 of radio-frequency (RF) tag 10 and readers according to the degree of this label signal decay.
As shown in Figure 1, radio-frequency (RF) tag 10 is sent an intensity and is the radiofrequency signal of-40dBm.When reader 20 receives radio-frequency (RF) signal strength be-60dBm, then the strength retrogression 20dB of radiofrequency signal.Bring strength retrogression 20dB into a decay formula, can be apart from about 30cm; When reader 20 receives radio-frequency (RF) signal strength be-70dBm, then the strength retrogression 30dB of radiofrequency signal.Bring strength retrogression 30dB into a decay formula, can be apart from about 40cm.Sensitivity based on reader 20,20 signal intensities that can read of reader also have a lower limit, if intensity excessive attenuation, strength retrogression 50dB for example, make the signal intensity attenuation that arrives reader 20 to-90dBm, this moment, signal intensity may be much smaller than the sensitivity of reader 20, causes reader 20 in fact can't produce the value of reading of signal intensity, and the distance of 20 of radio-frequency (RF) tag 10 and readers is greater than the maximum collection of letters border of reader 20 at this moment.
Again as shown in Figure 2, when receiving simultaneously label signal with a plurality of readers 20,30,40 simultaneously, just can judge respectively the distance of 20,30,40 of radio-frequency (RF) tag 10 and each readers.Be the center of circle with each reader 20,30,40, and draw respectively after the spheroid take aforesaid distance as radius, just can obtain synoptic diagram such as Fig. 2.Under the perfect condition, in a bit, and this point is radio-frequency (RF) tag 10 positions to each spheroid with intersection.But be subject to reader 20,30,40 value of the reading degree of accuracy for signal intensity, so each spheroid will form an intersection area 50, and radio-frequency (RF) tag 10 is to be arranged in intersection area 50.
But in fact the label signal die-away curve roughly as shown in Figure 3, when when surpassing particular range, die-away curve be irregular nonlinearities change, and the stable region of linear attenuation is approximately only in particular range, so that the decay formula of calculating distance is no longer applicable.Moreover different environment also can affect attenuation rate, and the barrier meeting in the environment produces the strength retrogression of nonlinearities change so that radiofrequency signal reflects, reflects or absorb according to the material generation of barrier.And aforesaid formula can only estimate linear intensity-distance relation, but intensity-distance relation mostly is nonlinear variation in the actual environment, so can't accurately record with decay formula the distance of radio-frequency (RF) tag 10 and 20,30,40 of readers.
Summary of the invention
In the RFID positioning system of known technology, between radio-frequency (RF) tag and the reader, make abrim label signal decay into the uncertain factor of nonlinearities change, and cause the location out of true.In view of foregoing problems, the invention provides a kind of positioning system and a kind of radio-frequency (RF) tag localization method, need not calculate the attenuation rate of label signal, and can get rid of the positioning error that the uncertain factor that causes label signal decay causes.
Positioning system proposed by the invention comprises a radio-frequency (RF) tag, at least one reader and a back-end server.
Radio-frequency (RF) tag is launched a plurality of label signals with different original signal intensity periodically, and the original signal intensity of each label signal determines a collection of letters border with respect to radio-frequency (RF) tag.Radio-frequency (RF) tag can be an active formula radio-frequency (RF) tag, has the seedbed to carry electric power source with one and sends each label signal; Or radio-frequency (RF) tag can be the passive type radio-frequency (RF) tag, launches periodically a trigger pip by reader, and trigger pip drives radio-frequency (RF) tag and sends label signal.
The label signal that reader sends in order to read radio-frequency (RF) tag, and reader receives the receiving intensity of corresponding label signal greater than a preset strength within each collection of letters border.The intensity that receives corresponding label signal when reader is greater than preset strength, reads that to differentiate the label signal that receives be one can receive signal, and radio-frequency (RF) tag is positioned within the corresponding collection of letters border.Back-end server determines that according to receiving collection of letters border corresponding to signal this radio-frequency (RF) tag is with respect to a possible position scope of this reader.
In the positioning system a plurality of readers can be set, make radio-frequency (RF) tag have respectively a possible position scope with respect to each reader, the position block that then back-end server just can be take the intersection area of these possible position scopes as radio-frequency (RF) tag.
The present invention further proposes a kind of radio-frequency (RF) tag localization method, by reader identification radio-frequency (RF) tag position.
In this method, be to launch periodically a plurality of label signals with different original signal intensity with radio-frequency (RF) tag first.The original signal intensity of aforesaid each label signal determines a collection of letters border with respect to this radio-frequency (RF) tag.
Reader receives the receiving intensity of corresponding label signal greater than a preset strength within each collection of letters border.Therefore, after reader reading tag signal, find out the reader receiving intensity greater than the label signal of preset strength, and differentiate receiving intensity greater than the label signal of preset strength for can receive signal.At last, back-end server is according to the possible position scope that can receive collection of letters border decision radio-frequency (RF) tag corresponding to signal.
This method can further obtain other possible position scopes corresponding to radio-frequency (RF) tag with one or more other readers, and determines that the intersection area of those possible position scopes is the position block of radio-frequency (RF) tag.
See through aforesaid combination, in the present invention, only need simply to judge whether reader receives label signal, and the collection of letters border that determines of the original signal intensity of finding out label signal, back-end server just can see through the overlapping relation on these collection of letters borders, judges that radio-frequency (RF) tag is with respect to the possible position scope of reader.Because back-end server or reader do not need to judge the attenuation rate of label signal, also need to not carry out complicated formula with the attenuation rate of label signal calculates, therefore the whole needed hardware resource of positioning system just can reduce, so that positioning system is more stable, locates quicker.Simultaneously, back-end server or reader are not the possible position scope of judging radio-frequency (RF) tag with the attenuation rate of label signal, and the positioning error that therefore can avoid causing the uncertain factor of label signal decay to cause is so that positioning result is more accurate.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 is the synoptic diagram of known RFID positioning system.
Fig. 2 is that known RFID positioning system is to the synoptic diagram of radio-frequency (RF) tag location.
Fig. 3 is the intensity-distance relation synoptic diagram of radiofrequency signal.
Fig. 4 is the configuration diagram of radio-frequency (RF) tag positioning system embodiment of the present invention.
Fig. 5 is the label signal synoptic diagram of radio-frequency (RF) tag positioning system embodiment of the present invention.
Fig. 6 is the position derivation synoptic diagram of the radio-frequency (RF) tag positioning system of radio-frequency (RF) tag positioning system embodiment of the present invention.
Fig. 7 is the process flow diagram of radio-frequency (RF) tag localization method the first embodiment of the present invention.
Fig. 8 is the process flow diagram of radio-frequency (RF) tag localization method the second embodiment of the present invention.
The main element symbol description:
10 radio-frequency (RF) tag
20,30,40 readers
50 intersection area
100 radio-frequency (RF) tag
110 position blocks
200,300,400 readers
201,301,401 possible position scopes
500 back-end servers
B1, b2, b3, b4, b5, b6 collection of letters border
Embodiment
Consult shown in Figure 4ly, be the framework of radio-frequency (RF) tag positioning system embodiment of the present invention, this radio-frequency (RF) tag positioning system comprises a radio-frequency (RF) tag 100, a reader 200 and a back-end server 500.
Consult shown in Figure 4, radio-frequency (RF) tag 100 is launched a plurality of label signals (Tag Signal) with different original signal intensity periodically, and each label signal comprises an intensity identification code A, B, C, each intensity identification code A, B, C include the original signal intensity (40dBm of each label signal when radio-frequency (RF) tag 100 is sent,-50dBm,-60dBm), separate the difference of each label signal for reader 200 or back-end server 500, and confirm each label signal original signal intensity.Label signal is through after transmitting, and along with range attenuation, and is read device 200 and receives.
In the example shown in Figure 4, radio-frequency (RF) tag 100 is launched three label signals with different original signal intensity periodically, the intensity identification code A of its grade, B, the original signal intensity that C is corresponding is respectively-40dBm ,-50dBm ,-60dBm, after transmitting arrival reader 200 sites, decay is in various degree arranged respectively.The label signal of intensity identification code A in the example and intensity identification code B decay to read intensity-70dBm and-73dBm, receive but still can be read device 200, include the label signal of intensity identification code A and intensity identification code B for can receive signal and reader is differentiated; And the label signal of intensity identification code C decays to the intensity that reads that reader 200 can't receive, so the label signal that reader 200 can not include intensity identification code C is differentiated for can receive signal.
And aforesaid radio-frequency (RF) tag 100 can be active formula radio-frequency (RF) tag or passive type radio-frequency (RF) tag.Active formula radio-frequency (RF) tag has the seedbed to carry electric power source with one to send label signal, and the passive type radio-frequency (RF) tag then needs launch periodically a trigger pip via reader 200, and trigger pip drives radio-frequency (RF) tag 100 and sends label signal.
Consult shown in Figure 5, the label signal that reader 200 sends in order to received RF label 100.The original signal intensity of each label signal that aforementioned radio-frequency (RF) tag 100 is sent, can determine a collection of letters border with respect to radio-frequency (RF) tag 100, within this collection of letters border, reader 200 can receive corresponding label signal, and differentiates this label signal for can receive signal.Radio-frequency (RF) tag 100 is as shown in the figure sequentially sent six label signals with different original signal intensity, along with the original signal intensity of each label signal is different, its collection of letters border with respect to radio-frequency (RF) tag 100 is also different, and the distance of differentiating for receiving signal so that reader 200 can receive label signal is also different.Therefore can according to the original signal intensity of each label signal, define the respectively different label signal of correspondence of six collection of letters border b1～b6.Reader 200 must be positioned within the b1～b6 of collection of letters border, just can receive corresponding label signal and differentiates for receiving signal.That is, when label signal for can receive signal the time, reader 200 is positioned at corresponding collection of letters border b1, b2 ... or within the b6.
Consult shown in Figure 5ly, the original signal intensity of label signal is stronger again, and then corresponding collection of letters border b1～b6 is larger.For example, if the original signal intensity of a label signal is powerhouse in six label signals, then the collection of letters border of its correspondence is mark b6 person, has maximum scope, and reader 200 can (scope that comprises b1～b5) be received this label signal in the scope of b6; Otherwise, if the original signal intensity of a label signal is weak person in six label signals, then the collection of letters border of its correspondence may be mark b1 person, has minimum scope, reader 200 can only be received this label signal in the scope of b1, if the zone of reader 200 between b6 to b 1, or outside b6, all can't receive the most weak label signal of original signal intensity.
Consult again Fig. 4 and shown in Figure 5, the received signal that back-end server 500 receives in order to find out reader 200, according to receiving collection of letters border b1～b6 corresponding to signal, oppositely according to collection of letters border b1～b6, determine that radio-frequency (RF) tag 100 is with respect to the possible position scope of reader 200.
Consult shown in Figure 4ly, radio-frequency (RF) tag 100 is sent completely after the label signal of one-period, and reader 200 can receive each label signal.Cause erroneous judgement in order to exempt from noise, radio-frequency (RF) tag 100 sends label signal constantly, increases the sample number of label signal to back-end server 500; The also variation of the possible position scope of sustainable judgement radio-frequency (RF) tag 100.
Whether reader 200 receives label signal, be receive the corresponding label signals with reader 200 receiving intensity whether greater than a preset strength as criterion.The receiving intensity that receives the corresponding label signals when reader 200 is differentiated this label signal that receives for can receive signal during greater than preset strength.This preset strength can directly be set as zero; That is when as long as reader 200 receives label signal, just differentiate label signal for can receive signal, and judge that reader 200 is positioned at the corresponding collection of letters of this label signal border b1, b2 ... or within the b6.But the numerical value of preset strength can be greater than zero, with removal system or outside noise on the practice.
Reader 200 is with wired or wireless connected mode, is connected in back-end server 500; And the received signal that reader 200 obtains is to be sent to back-end server 500.Back-end server 500 determines that according to receiving collection of letters border b1～b6 corresponding to signal this radio-frequency (RF) tag 100 is with respect to a possible position scope of this reader 200.
Because resulting receiving intensity when reader 200 receives label signal, and the original signal intensity can't be back-calculated to obtain label signal and sent by radio-frequency (RF) tag 100 time, therefore those label signals all need to comprise aforesaid intensity identification code, and the original signal intensity that the intensity identification code includes each label signal when being sent by radio-frequency (RF) tag 100, reader 200 or back-end server 500 just can be distinguished by the intensity identification code and be differentiated for can receive the label signal of signal thus, and obtain its original signal intensity.When label signal for can receive signal the time, back-end server 500 can be found out corresponding collection of letters border b1～b6 by original signal intensity corresponding to intensity identification code, and differentiates reader 200 and be positioned at and can receive within collection of letters border b1～b6 corresponding to signal.
Except the intensity identification code, owing to collection of letters border b1～b6 can determine in advance and be stored in the back-end server 500, so the intensity identification code also can replace with collection of letters Boundary Recognition code.That is comprise a collection of letters Boundary Recognition code in each label signal, can be read device 200 after the label signal that the original signal intensity that represents collection of letters border b1～b6 corresponding to label signal difference that collection of letters Boundary Recognition code differs according to original signal intensity, each border b1～b6 that collects mail differs is penetrated by radio-frequency (RF) tag 100 differentiates for receiving the scope of signal.The collection of letters Boundary Recognition code that therefore, can receive signal can be differentiated readers 200 for back-end server 500 and be arranged within the whichever of a plurality of collections of letters border b1～b6.
Should be noted, though collection of letters border b1～b6 that Fig. 5 draws presents the circle of two dimension, in fact label signal be simultaneously in the space towards all directions emissions, therefore the collection of letters border of each label signal is spheroid centered by radio-frequency (RF) tag 100 in theory.But can be subject to the interference such as obstruction, reflection and refraction of environment ground type in the process that in fact label signal transmits, or radio-frequency (RF) tag 100 emitting antennas own possess directive property slightly, may be so that label signal weaken or strengthen at specific direction, therefore real collection of letters border b1～b6 mostly is greatly the sealing block that irregular curve surrounds.Therefore, actual collection of letters border b1～b6 is defined as better embodiment according to the spot sampling result that radio-frequency (RF) tag 100 and reader 200 arrange environment.The collection of letters border b1～b6 of spot sampling carries out complicated formula with the attenuation rate of label signal to calculate.Therefore the whole needed hardware resource of positioning system just can reduce, the positioning error of avoiding simultaneously causing the uncertain factor of label signal decay to cause.
Consult shown in Figure 6ly, according to the collection of letters border that can receive signal, back-end server 500 can oppositely be derived and be obtained radio-frequency (RF) tag 100 with respect to reader 200,300,400 possible position scope 201,301,401.
As shown in Figure 6, a plurality of readers 200,300,400 can be set in the radio-frequency (RF) tag positioning system, and whether radio-frequency (RF) tag 100 to differentiate first each label signal be to receive signal if sending each reader 200 of label signal periodically, and transmit and can receive signal to back-end server (not being illustrated in Fig. 6).Then back-end server can receive the corresponding collection of letters of signal border according to those, oppositely obtains radio-frequency (RF) tag 100 with respect to the possible position scope 201,301,401 of each reader 200,300,400.At last, the intersection area of back-end server 500 those possible position scopes 201,301,401 of differentiation is the position block 110 at these radio-frequency (RF) tag 100 places.
Consulting shown in Figure 7ly, is the process flow diagram of radio-frequency (RF) tag localization method the first embodiment of the present invention.The radio-frequency (RF) tag localization method is executed in the positioning system of the present invention.The process description of radio-frequency (RF) tag localization method is as follows.
Step?1：
Positioning system is launched a plurality of label signals with different original signal intensity periodically with radio-frequency (RF) tag 100.
Aforementioned each label signal comprises respectively an intensity identification code, and each intensity identification code includes the original signal intensity of each label signal when radio-frequency (RF) tag 100 is sent, in order to judge the original signal intensity of each label signal.The green strength of each label signal determines a collection of letters border b1～b6 with respect to this radio-frequency (RF) tag, so intensity identification code system uses for differentiating the corresponding collection of letters of each label signal border b1～b6.Aforesaid intensity identification code also can be collection of letters Boundary Recognition code, and each collection of letters border b1～b6 corresponding to label signal difference that the Boundary Recognition code differs according to original signal intensity that collect mail is for differentiating the corresponding collection of letters of each label signal border b1～b6.Radio-frequency (RF) tag 100 can be an active formula radio-frequency (RF) tag, has the seedbed to carry electric power source with one and sends each label signal.
The original signal intensity of each label signal determines a collection of letters border b1～b6 with respect to radio-frequency (RF) tag 100, therefore reader 200 must be positioned within the b1～b6 of collection of letters border, the receiving intensity that reader 200 receives corresponding label signal could be greater than a preset strength, can receive signal to differentiate label signal as one, reader 200 is to be positioned at each can receive within collection of letters border b1～b6 corresponding to signal with respect to the position of radio-frequency (RF) tag 100 at this moment.
Step?2：
Positioning system reads the label signal that radio-frequency (RF) tag 100 is sent with reader 200.
Step?3：
For example preset strength is-80dBm (also can be zero), and the receiving intensity that reader 200 receives is during greater than-80dBm, and then reader 200 is differentiated label signals for can receive signal, and reader 200 is can receive within collection of letters border corresponding to signal in this at this moment; The receiving intensity that reader 200 receives is less than-80dBm or be zero (not receiving label signal), and then reader 200 is differentiated label signals for can not receive signal, and reader 200 is to be positioned at outside collection of letters border corresponding to this label signal at this moment.
Step?4：
When label signal is in the time of can receiving signal, back-end server 500 differentiation readers 200 are positioned at and can receive within collection of letters border corresponding to signal, therefore back-end server 500 can be according to receiving collection of letters border 210 corresponding to signal, 220, determine that radio-frequency (RF) tag 100 is with respect to the possible position scope 201 of reader 200.
Positioning system can be simultaneously or sequentially with other readers 300,400 received RF signals, find out radio-frequency (RF) tag 100 with respect to other readers 300,400 possible position scope 301, after 401, back-end server 500 determines that the intersection area of those possible position scopes 201,301,401 is the position block 110 of radio-frequency (RF) tag 100.
Consult shown in Figure 8ly, be the process flow diagram of radio-frequency (RF) tag localization method the second embodiment of the present invention.The radio-frequency (RF) tag 100 of the second embodiment is a passive type radio-frequency (RF) tag, and the radio-frequency (RF) tag localization method of the second embodiment need be done correction, adds Step 1a before Step 1 again.
Step?1a：
Launch periodically a trigger pip with reader 200, trigger pip drives radio-frequency (RF) tag 100 and sends label signal.
Signal driver just can send label signal because the radio-frequency (RF) tag 100 of passive type need to be triggered, and therefore, after the step among the Step 4 was finished, requirements of process was returned to Step 1a, again sent trigger pip, and 100 beginnings of radio-frequency (RF) tag can continue to send label signal.
Although the present invention discloses as above with preferred embodiment; so it is not to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.
Claims (13)
1. radio-frequency (RF) tag positioning system comprises:
One radio-frequency (RF) tag is launched a plurality of label signals with different original signal intensity periodically, and the original signal intensity of each label signal determines a collection of letters border with respect to radio-frequency (RF) tag, and the border of wherein respectively collecting mail is the sealing block that irregular curve surrounds;
At least one reader, those label signals that send in order to read this radio-frequency (RF) tag, wherein this reader is within each collection of letters border, and the receiving intensity that receives the corresponding label signal is during greater than a preset strength, differentiates this label signal that receives and is one and can receive signal; And
One back-end server according to receiving collection of letters border corresponding to signal, determines that this radio-frequency (RF) tag is with respect to a possible position scope of this reader.
2. radio-frequency (RF) tag positioning system as claimed in claim 1 is characterized in that, comprises an intensity identification code in each label signal, and this intensity identification code includes each label signal original signal intensity when this radio-frequency (RF) tag is sent.
3. radio-frequency (RF) tag positioning system as claimed in claim 1, it is characterized in that, comprise a collection of letters Boundary Recognition code in each label signal, the label signal that this collection of letters Boundary Recognition code differs according to original signal intensity is corresponding different collection of letters border respectively, and each border of collecting mail represent, and can be read after label signal that original signal intensity differs is penetrated by radio-frequency (RF) tag that device differentiates be the scope that can receive signal.
4. radio-frequency (RF) tag positioning system as claimed in claim 1 is characterized in that, this radio-frequency (RF) tag is an active formula radio-frequency (RF) tag, has the seedbed to carry electric power source with one and sends respectively this label signal.
5. radio-frequency (RF) tag positioning system as claimed in claim 1 is characterized in that, this radio-frequency (RF) tag is a passive type radio-frequency (RF) tag, and this reader launches a trigger pip periodically, and trigger pip drives this radio-frequency (RF) tag and sends those label signals.
6. radio-frequency (RF) tag positioning system as claimed in claim 1 is characterized in that, when this label signal is that this back-end server is differentiated this reader bit and can be received within collection of letters border corresponding to signal in this in the time of can receiving signal.
7. radio-frequency (RF) tag positioning system as claimed in claim 1, it is characterized in that, this positioning system has a plurality of readers, and this radio-frequency (RF) tag has respectively a possible position scope with respect to this reader respectively, and this back-end server is differentiated the intersection area of those possible position scopes and is the position block at this radio-frequency (RF) tag place.
8. radio-frequency (RF) tag localization method, by a reader identification one radio-frequency (RF) tag position, it is as follows to comprise step:
Launch periodically a plurality of label signals with different original signal intensity with this radio-frequency (RF) tag, wherein the original signal intensity of each label signal determines a collection of letters border with respect to this radio-frequency (RF) tag, and the border of wherein respectively collecting mail is the sealing block that irregular curve surrounds;
Receive those label signals with this reader, wherein this reader receives the receiving intensity of corresponding label signal greater than a preset strength within each collection of letters border;
Take this reader differentiate receiving intensity greater than the label signal of preset strength as receiving signal; And
Can receive the possible position scope that collection of letters border corresponding to signal determines this radio-frequency (RF) tag according to those.
9. radio-frequency (RF) tag localization method as claimed in claim 8 is characterized in that, comprises an intensity identification code in each label signal, and each intensity identification code includes each label signal original signal intensity when this radio-frequency (RF) tag is sent.
10. radio-frequency (RF) tag localization method as claimed in claim 8, it is characterized in that, respectively comprise a collection of letters Boundary Recognition code in this label signal, the label signal that this collection of letters Boundary Recognition code differs according to original signal intensity is corresponding different collection of letters border respectively, and each border of collecting mail represent, and can be read after label signal that original signal intensity differs is penetrated by radio-frequency (RF) tag that device differentiates be the scope that can receive signal.
11. radio-frequency (RF) tag localization method as claimed in claim 8 is characterized in that, this radio-frequency (RF) tag is an active formula radio-frequency (RF) tag, has the seedbed to carry electric power source with one and sends respectively this label signal.
12. radio-frequency (RF) tag localization method as claimed in claim 8 is characterized in that, this radio-frequency (RF) tag is a passive type radio-frequency (RF) tag, and more comprises a step before this radio-frequency (RF) tag sends this label signal:
Launch periodically a trigger pip with this reader, trigger pip drives this radio-frequency (RF) tag and sends those label signals.
13. radio-frequency (RF) tag localization method as claimed in claim 8, it is characterized in that, more comprise a step, obtain another possible position scope corresponding to this radio-frequency (RF) tag with another reader at least, determine that the intersection area of those possible position scopes is the position block at this radio-frequency (RF) tag place.
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