CN109359493A - A kind of label statistical system and method based on three-dimensional array - Google Patents
A kind of label statistical system and method based on three-dimensional array Download PDFInfo
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- CN109359493A CN109359493A CN201811025159.3A CN201811025159A CN109359493A CN 109359493 A CN109359493 A CN 109359493A CN 201811025159 A CN201811025159 A CN 201811025159A CN 109359493 A CN109359493 A CN 109359493A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
- G06K7/10356—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers using a plurality of antennas, e.g. configurations including means to resolve interference between the plurality of antennas
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
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Abstract
The invention belongs to field of radio frequency identification, it is related to a kind of label statistical system and method based on three-dimensional array, it is characterized in that the system comprises: the set of tags of random distribution in statistical regions, the three-dimensional array disposed at statistical regions edge or in addition, tag read unit and label statistic unit.The method includes: that label statistic unit initializes local label status list first, and pass through tag read cells modulate and demodulation radiofrequency signal, by all sub-antennas of certain time interval poll three-dimensional array, the tag state list of label statistic unit is written in the tags unique identifier symbol that each sub-antenna returns in polling procedure, and label statistic unit summarizes tag state all in current statistic region out after completing all sub-antenna polls or just omits distributed areas.The present invention utilizes the antenna of space three-dimensional distribution, improves precision, speed and ability in fixed area interior label statistics, can be widely used in the environment of label dense deployment.
Description
Technical field
The present invention relates to field of radio frequency identification more particularly to a kind of label statistical systems and side based on three-dimensional array
Method.
Background technique
Radio frequency identification (RFID, Radio Frequency Identification) is one and realizes nothing using radiofrequency signal
The automatic identification technology for contacting information transmitting can play the effects of identifying identification, item tracking, information collection.With bar code, magnetic
Other identification technologies such as card are compared, and RFID technique has many advantages, such as that non-contact, non line of sight, anti-interference are strong, capacity is big, from 20th century 60
It has been widely used since age is commercial in all trades and professions such as medical treatment, education, logistics.
Typical RFID system generally includes label, read-write cell and antenna three parts composition.By the work of RFID system
Frequency is classified, and low frequency, four class of medium-high frequency, hyperfrequency and microwave can be divided into.It is different from low frequency, medium-high frequency RFID system,
Reading and writing device antenna since hyperfrequency and microwave section radio wave diffraction ability are weaker, for hyperfrequency and microwave section RFID tag
It is usually designed to directional aerial, the only electronic tag in antenna direction beam area can be read and write, passive label
Operating distance is greater than 1 meter, and the maximum functional distance of active label can be more than hundred meters.Using the RFID of hyperfrequency and microwave frequency band
System, a RFID read-write equipment can distinguish multiple labels in its reading area simultaneously.With hyperfrequency and microwave frequency band
RFID system a large amount of uses, industry by more and more attentions invest RFID tag Study of location, propose
It is calculated using the positioning of the signal characteristics such as direction of arrival degree, signal arrival time, signal arrival time difference, received signal strength
Method.
Different from pinpoint demand, certain occasions need accurately to count label, such as the object in container
Product quantity.Conventional RFID tag statistical means rely on portable antenna or the mobile precision that statistics is promoted by statistics object, in label
It can satisfy the statistical accuracy demand of certain occasion when number is less.Another optional means are using two or more only
Vertical antenna channels carry out label statistics, but the antenna arbitrarily disposed is limited to the promotion of precision, and the presence of antenna blind area makes portion
Minute mark label can not be counted always.Furthermore it is limited to reading capability of the reader under intensive label, such as certain domestic reader one
Secondary multi-tag read operation can only read 5 labels at random, when the number of label is much larger than the energy of a multi-tag read operation
When power, the precision of statistics is needed by repeatedly reading to be promoted.Primary more marks can be promoted using the higher import equipment of price
The ability of read operation is signed, but high cost, huge equipment volume, higher equipment power dissipation are promoting such equipment
There are certain difficulty on universal, and can not avoid the statistics when label is in antenna blind area always and lose problem.
Summary of the invention
Technology of the invention solves the problems, such as: in view of the deficiencies of the prior art, providing a kind of label based on three-dimensional array
Statistical system and method overcome the problems, such as the radiofrequency signal coverage hole in random single antenna or multiple antennas deployment, realize limited sky
The high efficiency and accuracy of interior intensive label statistics, provide inexpensive solution route for the application under intensive tag environment.Tool
Body technique scheme is as follows:
To achieve the above object, the present invention provides a kind of label statistical system based on three-dimensional array, it can be achieved that label
The all standing of radiofrequency signal in statistical regions, the system include following four parts composition:
(1) set of tags, the set of tags are made of more than one label, and each label has unique identifier, one
Determine random distribution in space, and the direction of label is random, has the ability of responsive tags inquiry, the space where all labels is closed
Collection is defined as statistical regions, and size is defined as S；
(2) three-dimensional array, the three-dimensional array are made of n sub-antenna and array control module, and n is greater than or equal to
6, for the sub-antenna along disposing outside statistical regions edge or statistical regions, each sub-antenna has unique identifier, and has
There are different spatial distribution position and antenna to be directed toward orientation, the form of three-dimensional deployment is presented, enables the half-power wave of each sub-antenna
Beam overlay area is Pi, then the sum of half-power beam overlay area of all sub-antennas meets following constraint:
The array control module has 1 to enter the radio frequency matrix majorization ability that n goes out；Three-dimensional array is from label statistic unit
The radiofrequency signal that tag read unit generates, is output to specified sub-antenna by receiving channel control instruction, and by specified sub- day
The Tag Radio Frequency signal that line returns is sent to tag read unit；
(3) tag read unit, the tag read unit has radio-frequency receiving-transmitting and baseband modulation and demodulation ability, from label
Statistic unit acquisition instruction generates radiofrequency signal and exports to three-dimensional array, and demodulates the Tag Radio Frequency of three-dimensional array return
Signal send the tags unique identifier symbol and return signal intensity of extraction to label statistic unit；
(4) label statistic unit, the label statistic unit have three-dimensional array control and label Statisti-cal control ability,
To the array control module sendaisle control instruction of three-dimensional array, label statistics instruction is sent to tag read unit, and
The label information returned is obtained from tag read unit, carries out label statistics and is summarized.
The label statistical method based on three-dimensional array that the invention also provides a kind of, can make full use of three-dimensional array
Non-blind area characteristic, comprising the following steps:
A01, label statistic unit starting label statistics, the tag state list of init Tag statistic unit local, this
It include the unique identifier of all known labels in ground label status list；
A02, label statistic unit send label to tag read unit and count sign on, according to poll rule, to three
Antenna array sendaisle control instruction is tieed up, order opens or closes three-dimensional array sub-antenna, starts sub-antenna poll；
A03, tag read unit receive the label statistics sign on of label statistic unit sending, modulate and generate mark
Label inquiry radiofrequency signal, output to three-dimensional array；The channel control that three-dimensional array receives the sending of label statistic unit refers to
It enables, transfers to array control module to handle, array control module opens or closes specified three-dimensional array sub-antenna；
A04, three-dimensional array receive the tag queries radiofrequency signal of tag read unit sending, through array control module
The signal is forwarded to the sub-antenna of specified opening, and is launched from the sub-antenna of specified opening；
A05, multiple labels receive the tag queries radiofrequency signal of three-dimensional array transmitting, and responsive tags inquiry respectively is penetrated
Frequency signal includes the unique identifier of respective label in response signal；
A06, three-dimensional array receive the radiofrequency signal of label return by open sub-antenna, through array control module
Tag Radio Frequency signal is sent to tag read unit；
A07, tag read unit demodulate the Tag Radio Frequency signal returned from three-dimensional array, and the label of extraction is uniquely marked
Know the label informations such as symbol, return signal intensity and is sent to label statistic unit；
After A08, label statistic unit receive the label information of tag read unit return, starting timer, and according to
The statistical of setting updates local label status list；
A09, label statistic unit wait t ms；
A10, label statistic unit judge whether tag read unit is sending label data back to, jump if sending data
A09 step is gone to, as no data is sent back to, then it is assumed that the label in the current sub-antenna area of coverage, which has counted, to be finished, and is continued to execute
A11；
A11, label statistic unit, which check whether, has met poll stop condition, if not meeting poll stop condition according to
The next sub-antenna of poll criterion poll, go to step A02, and step A12 is continued to execute if meeting poll stop condition；
A12, label statistic unit are set according to output mode, export current statistic region interior label state.
Further, poll rule is that the memoryless poll of fair priority is regular in the step A02, and each poll is equal
It is incremented by by serial number from the 1st sub- antennae polling to n-th of sub-antenna.
Further, poll rule is that performance priority has a memory poll rule in the step A02, when initial poll
It is incremented by by serial number from the 1st sub- antennae polling to n-th of sub-antenna, the number of tags that follow-up poll is then returned according to each sub-antenna
It carries out from more to less, same label number is then according to sub-antenna serial number, small preferential of antenna serial number.
Further, statistical is the preferential binary system statistics of storage, local label status Bar in the step A08
The present or absent information of some label is only saved in table, the label of 0 expression this unique identifier expression is not present, and 1 indicates
The label that this unique identifier indicates exists, the unique identifier in the unique identifier and local label status list of return
To the corresponding tag state of the unique identifier is then set 1 when corresponding to, label statistic unit is that all sub-antennas safeguard one jointly
Tag state list.
Further, statistical is to count using preferential set in the step A08, local label status list
Middle some label of preservation existing status information in all sub-antenna areas of coverage, { 1,0 } indicate what this unique identifier indicated
Label is not present in 1 area of coverage of sub-antenna, and { 1,81 } indicates that the label that this unique identifier indicates is present in the covering of sub-antenna 1
Qu Zhong, and return signal intensity is -81dbm, { 2,0 } indicate that the label that this unique identifier indicates is not present in sub-antenna 2 and covers
In cover region, the label that { 2,63 } indicate that this unique identifier indicates is present in 2 area of coverage of sub-antenna, and return signal intensity
For -63dbm, and so on；Label statistic unit is that each sub-antenna separately maintains a tag state list.
Further, poll stop condition is that all known labels mark and are or in the step A11
All sub-antennas of three-dimensional array are traversed, when using there is memory poll rule, initial poll stop condition is forced to traversal three
Tie up all sub-antennas of antenna array.
Further, the output mode in the step A12 is to summarize mode, and label statistical module exports current statistic
The unique identifier of the number of tags and each label that are counted in area.
Further, output mould when using set statistical as claimed in claim 6, in the step A12
Formula supports detail modes, and in this mode, label statistical module not only exports the number of tags counted in current statistic area
And the unique identifier of each label, additionally it is possible to which the tag state list according to set statistics provides each label and is distributed roughly
Region；Summary distributed areas divide according to return signal intensity as follows at the beginning of label:
(1) the big 10dbm of signal strength that label is returned in other sub-antennas of signal intensity ratio that some sub-antenna returns, then
The label label that just slightly distributed areas only prompt the unique identifier to indicate is located in the sub-antenna overlay area；
(2) difference for the signal strength and maximum value that label is returned in multiple sub-antennas is within 10dbm, then label just slightly divides
The label that cloth region prompts the unique identifier to indicate is likely located in multiple sub-antenna overlay areas；
(3) the small 10dbm of signal strength that label is returned in other sub-antennas of signal intensity ratio that some sub-antenna returns, then
Just the sub-antenna is ignored in slightly distributed areas to label, and the label for not prompting the unique identifier to indicate is located at the sub-antenna overlay area
It is interior.
Using the present invention obtain the utility model has the advantages that the present invention utilize three-dimensional array non-blind area characteristic, counted by label
Unit controls three-dimensional array and tag read unit, cooperates the poll rule and statistical of optimization design, may be implemented
The fast and accurately statistics and output of a large amount of labels in the confined space, can be in the RFID system under intensive tag environment extensively
It uses.
Detailed description of the invention
Fig. 1 show the system composition block diagram of the invention；
Fig. 2 show three-dimensional array composition schematic diagram of the invention；
Fig. 3 show method implementation steps schematic diagram of the invention；
Fig. 4 show the three-dimensional array and thirdly axial projection's schematic diagram of the embodiment of the present invention；
Fig. 5 show the label distribution schematic diagram of the embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
As shown in Figure 1, the present invention proposes that a kind of label statistical system based on three-dimensional array includes following four part group
At:
Set of tags C01, set of tags are made of more than one label, and each label has unique identifier, certain empty
Interior random distribution, and the direction of label is random, has the ability of responsive tags inquiry, the space intersection where all labels is fixed
Justice is statistical regions, and size is defined as S, and label receives the tag queries radiofrequency signal C08 issued by three-dimensional array, through interior
Label information C09 is returned to three-dimensional array after portion's signal processing；
Three-dimensional array C02, the composition of three-dimensional array as shown in Fig. 2, three-dimensional array by n sub-antenna C0202 and
Array control module C0201 constitute, n be greater than or equal to 6, all sub-antennas along statistical regions edge or statistical regions outside
Administration, each sub-antenna have unique identifier, and there is different spatial distribution positions and antenna to be directed toward orientation, present three-dimensional
The form of deployment, enabling the half-power beam overlay area of each sub-antenna is Pi, then the half-power beam covering of all sub-antennas
The sum of region meets following constraint:
Array control module C0201 has 1 to enter the radio frequency matrix majorization ability that n goes out；Three-dimensional array counts single from label
The radiofrequency signal C07 that tag read unit generates is output to specified sub-antenna by first receiving channel control instruction C06, and will
The Tag Radio Frequency signal C10 that specified sub-antenna returns is sent to tag read unit；
Tag read unit C03, the tag read unit has radio-frequency receiving-transmitting and baseband modulation and demodulation ability, from label
Statistic unit acquisition instruction C05 generates radiofrequency signal C07 and exports to three-dimensional array, and demodulates the mark of three-dimensional array return
Radiofrequency signal C10 is signed, the tags unique identifier symbol and return signal intensity C11 of extraction are sent to label statistic unit；
Label statistic unit C04, the label statistic unit have three-dimensional array control and label Statisti-cal control ability,
To the array control module sendaisle control instruction C06 of three-dimensional array, label statistics instruction is sent to tag read unit
C05, and obtain the label information C11 returned from tag read unit, carry out label statistics and summarize.
Fig. 3 gives the step schematic diagram of the label statistical method proposed by the present invention based on three-dimensional array, this method
The following steps are included:
Step A01, label statistic unit starting label statistics, the tag state column of init Tag statistic unit local
Table includes the unique identifier of all known labels in local label status list.
Step A02, label statistic unit sends label to tag read unit and counts sign on, regular according to poll,
To three-dimensional array sendaisle control instruction, order opens or closes three-dimensional array sub-antenna, starts sub-antenna poll.When
When considering fair priority, system is using memoryless poll rule, and when considering performance priority, system, which uses, memory poll rule
Then.The memoryless each poll of poll rule is pressed serial number and is incremented by from the 1st sub- antennae polling to n-th of sub-antenna；There is memory wheel
It is incremented by by serial number from the 1st sub- antennae polling to n-th of sub-antenna when asking regular initial poll, follow-up poll is then according to each sub- day
The number of tags that line returns carries out from more to less, and same label number is then according to sub-antenna serial number, small preferential of antenna serial number.
Step A03, tag read unit receives the label statistics sign on of label statistic unit sending, modulates and raw
At tag queries radiofrequency signal, output to three-dimensional array；Three-dimensional array receives the channel control of label statistic unit sending
System instruction, transfers to array control module to handle, array control module opens or closes specified three-dimensional array sub-antenna.
Step A04, three-dimensional array receives the tag queries radiofrequency signal of tag read unit sending, through antenna array control
The signal is forwarded to the sub-antenna of specified opening by module, and is launched from the sub-antenna of specified opening.
Step A05, multiple labels receive the tag queries radiofrequency signal of three-dimensional array transmitting, and responsive tags are looked into respectively
Radiofrequency signal is ask, includes the unique identifier of respective label in response signal.
Step A06, three-dimensional array receives the radiofrequency signal of label return by open sub-antenna, through antenna array control
Module send Tag Radio Frequency signal to tag read unit.
Step A07, tag read unit demodulates the Tag Radio Frequency signal returned from three-dimensional array, only by the label of extraction
The label informations such as one identifier, return signal intensity are sent to label statistic unit.
Step A08, after label statistic unit receives the label information that tag read unit returns, start timer, and
Local label status list is updated according to the statistical of setting.
When to save system memory size, system is counted using preferential binary system is stored, local label status list
In only save the present or absent information of some label, the label that 0 expression this unique identifier indicates is not present, and 1 indicates this
The label that unique identifier indicates exists, the unique identifier pair in the unique identifier and local label status list of return
At once, then the corresponding tag state of the unique identifier is set 1, label statistic unit is that all sub-antennas safeguard a mark jointly
Sign status list.
When memory capacity is sufficiently large in system, the set that system uses application preferential is counted, local label status list
Middle some label of preservation existing status information in all sub-antenna areas of coverage, { 1,0 } indicate what this unique identifier indicated
Label is not present in 1 area of coverage of sub-antenna, and { 1,81 } indicates that the label that this unique identifier indicates is present in the covering of sub-antenna 1
Qu Zhong, and return signal intensity is -81dbm, { 2,0 } indicate that the label that this unique identifier indicates is not present in sub-antenna 2 and covers
In cover region, the label that { 2,63 } indicate that this unique identifier indicates is present in 2 area of coverage of sub-antenna, and return signal intensity
For -63dbm, and so on；Label statistic unit is that each sub-antenna separately maintains a tag state list.
Step A09, label statistic unit waits t ms.
Step A10, label statistic unit judges whether tag read unit is sending label data back to, is such as sending data
Then go to step A09, as no data is sent back to, then it is assumed that the label in the current sub-antenna area of coverage, which has counted, to be finished, and continues to hold
Row step A11.
Step A11, label statistic unit checks whether that all known labels mark for or traversed three
Tie up all sub-antennas of antenna array.According to the next sub-antenna of poll criterion poll if not meeting above-mentioned poll stop condition, jump
Go to step A02, such as it is above-mentioned meet poll stop condition first continue to execute step A12.It should be noted that having when using
When remembering poll rule, initial poll stop condition is forced to traversal all sub-antennas of three-dimensional array.
Step A12, label statistic unit is set according to output mode, exports current statistic region interior label state.
When only needing to check the number of tags in statistical regions, system output mode is counted using mode, label is summarized
The unique identifier of the number of tags and each label that are counted in module output current statistic area.
When step A08 is using set statistical, the output mode of system supports detail modes, in this mode, mark
Label statistical module not only exports the unique identifier of the number of tags counted in current statistic area and each label, moreover it is possible to
Enough tag state lists according to set statistics provide the region that each label is distributed roughly；Label just slightly distributed areas according to returning
Return signal strength divide it is as follows:
(1) the big 10dbm of signal strength that label is returned in other sub-antennas of signal intensity ratio that some sub-antenna returns, then
The label label that just slightly distributed areas only prompt the unique identifier to indicate is located in the sub-antenna overlay area；
(2) difference for the signal strength and maximum value that label is returned in multiple sub-antennas is within 10dbm, then label just slightly divides
The label that cloth region prompts the unique identifier to indicate is likely located in multiple sub-antenna overlay areas；
(3) the small 10dbm of signal strength that label is returned in other sub-antennas of signal intensity ratio that some sub-antenna returns, then
Just the sub-antenna is ignored in slightly distributed areas to label, and the label for not prompting the unique identifier to indicate is located at the sub-antenna overlay area
It is interior.
Below in conjunction with attached drawing, be discussed in detail one include 10 sub-antennas three-dimensional array and the implementation of 12 labels statistics
Example, each poll of tag read unit at most handles 8 label datas in embodiment, and each sub-antenna poll time is
200ms。
Fig. 4 (a) gives the three-dimensional array schematic diagram in embodiment including 10 sub-antennas, is represented by S in figure
Statistical regions where label, size use space rectangular coordinate system are defined as follows:
S=(x, y, z), 0≤x≤2,0≤y≤1,0≤z≤1
10 sub-antennas are respectively provided with unique identifier U21, U22, U23, U24, U25, U26, U27, U28, U29 and U10,
The spatial position that it is disposed is as follows:
| Antenna number | U21 | U22 | U23 | U24 | U25 |
| Spatial position | (0.5,1,0.5) | (1.5,1,0.5) | (2,0.5,0.5) | (1.5,0,0.5) | (0.5,0,0.5) |
| Antenna number | U26 | U27 | U28 | U29 | U210 |
| Spatial position | (0,0.5,0.5) | (0.5,0.5,1) | (1.5,0.5,1) | (0.5,0.5,0) | (1.5,0.5,0) |
Fig. 4 (b) gives projection of the three-dimensional array on x/y plane, and wherein the corresponding frame of Sxy indicates that statistical regions S exists
Projection on x/y plane, the corresponding frame of P1xy indicate throwing of the half-power beam overlay area P1 of sub-antenna U21 on x/y plane
Shadow, the corresponding frame of P2xy indicate projection of the half-power beam overlay area P2 of sub-antenna U22 on x/y plane, and P3xy is corresponding
Frame indicates projection of the half-power beam overlay area P3 of sub-antenna U23 on x/y plane, and the corresponding frame of P4xy indicates sub-antenna
Projection of the half-power beam overlay area P4 of U24 on x/y plane, the corresponding frame of P5xy indicate the half-power wave of sub-antenna U25
Projection of the beam overlay area P5 on x/y plane, the corresponding frame of P6xy indicate the half-power beam overlay area P6 of sub-antenna U26
Projection on x/y plane.Relationship between each view field is shown below:
Fig. 4 (c) gives projection of the three-dimensional array in yz plane, and wherein the corresponding frame of Syz indicates that statistical regions S exists
Projection in yz plane, the corresponding frame of P1yz/P2yz indicate the half-power beam overlay area P1 and sub-antenna of sub-antenna U21
Joint projection of the half-power beam overlay area P2 of U22 in yz plane, the corresponding frame of P4yz/P5yz indicate sub-antenna U24
Half-power beam overlay area P4 and joint of the half-power beam overlay area P5 in yz plane of sub-antenna U25 throw
Shadow, the corresponding frame of P7yz/P8yz indicate the half-power of the half-power beam overlay area P7 and sub-antenna U28 of sub-antenna U27
Joint projection of the beam coverage area P8 in yz plane, the corresponding frame of P9yz/P10yz indicate the half-power wave of sub-antenna U29
Joint projection of the half-power beam overlay area P10 of beam overlay area P9 and sub-antenna U210 in yz plane.Each projection
Relationship between region is shown below:
Fig. 4 (d) gives projection of the three-dimensional array in xz plane, and wherein the corresponding frame of Sxz indicates that statistical regions S exists
Projection in xz plane, the corresponding frame of P7xz indicate throwing of the half-power beam overlay area P7 of sub-antenna U27 in xz plane
Shadow, the corresponding frame of P8xz indicate projection of the half-power beam overlay area P8 of sub-antenna U28 in xz plane, and P3xz is corresponding
Frame indicates projection of the half-power beam overlay area P3 of sub-antenna U23 in xz plane, and the corresponding frame of P6xz indicates sub-antenna
Projection of the half-power beam overlay area P6 of U26 in xz plane, the corresponding frame of P9xz indicate the half-power wave of sub-antenna U29
Projection of the beam overlay area P9 in xz plane, the corresponding frame of P10xz indicate the half-power beam overlay area of sub-antenna U210
Projection of the P10 in xz plane.Relationship between each view field is shown below:
By above three projection can it is approximate go out following inference:
Fig. 5 (a) gives distribution situation of the set of tags of 12 labels composition in statistical regions S, and each label is respectively
Unique identifier be T01, T02, T03, T04, T05, T06, T07, T08, T09, T10, T11 and T12, corresponding space bit
It sets as shown in the table:
Fig. 5 (b), Fig. 5 (c), Fig. 5 (d) are respectively projection of 12 labels in xy, yz, xz plane, wherein 1., 2.,
③、④、⑤、⑥、⑦、⑧、⑨、⑩、Respectively indicate label T01 to T12.
Under the polling interval 200ms, the information that sub-antenna returns can be disposed within this time, without again waiting for
200ms.The information read in each sub-antenna poll is as follows, and wherein NN indicates the unique identification of subsequent and then label
Symbol, MM indicate that successive character is return signal intensity.
■U21
Label statistic unit issues the instruction of statistics sub-antenna U21 to tag read unit, and label statistic unit is to three-dimensional
The channel control instruction that antenna array sends and opens sub-antenna U21, closes other sub-antennas, three-dimensional array are receiving label statistics
After the channel control instruction that unit issues, sub-antenna U21 is opened by array control module and closes other sub-antennas.Sub-antenna
U21 sends the tag queries radiofrequency signal of tag read cells modulate and receives the signal of set of tags interior label return.From sub- day
In the return signal that line U21 is received, tag read unit extracts 4 label informations:
<NNT12MM80 NNT11MM65 NNT10MM70 NNT09MM75>
■U22
Label statistic unit issues the instruction of statistics sub-antenna U22 to tag read unit, and label statistic unit is to three-dimensional
The channel control instruction that antenna array sends and opens sub-antenna U22, closes other sub-antennas, three-dimensional array are receiving label statistics
After the channel control instruction that unit issues, sub-antenna U22 is opened by array control module and closes other sub-antennas.Sub-antenna
U22 sends the tag queries radiofrequency signal of tag read cells modulate and receives the signal of set of tags interior label return.From sub- day
In the return signal that line U22 is received, tag read unit extracts 5 label informations:
<NNT09MM79 NNT07MM75 NNT06MM81 NNT05MM83 NNT04MM63>
■U23
Label statistic unit issues the instruction of statistics sub-antenna U23 to tag read unit, and label statistic unit is to three-dimensional
The channel control instruction that antenna array sends and opens sub-antenna U23, closes other sub-antennas, three-dimensional array are receiving label statistics
After the channel control instruction that unit issues, sub-antenna U23 is opened by array control module and closes other sub-antennas.Sub-antenna
U23 sends the tag queries radiofrequency signal of tag read cells modulate and receives the signal of set of tags interior label return.From sub- day
In the return signal that line U23 is received, tag read unit extracts 8 label informations:
<NNT03MM65 NNT07MM68 NNT08MM73 NNT02MM75 NNT01MM84 NNT12MM88
NNT10MM75 NNT11MM81>
■U24
Label statistic unit issues the instruction of statistics sub-antenna U24 to tag read unit, and label statistic unit is to three-dimensional
The channel control instruction that antenna array sends and opens sub-antenna U24, closes other sub-antennas, three-dimensional array are receiving label statistics
After the channel control instruction that unit issues, sub-antenna U24 is opened by array control module and closes other sub-antennas.Sub-antenna
U24 sends the tag queries radiofrequency signal of tag read cells modulate and receives the signal of set of tags interior label return.From sub- day
In the return signal that line U24 is received, tag read unit extracts 3 label informations:
<NNT06MM62 NNT04MM83 NNT03MM76>
■U25
Label statistic unit issues the instruction of statistics sub-antenna U25 to tag read unit, and label statistic unit is to three-dimensional
The channel control instruction that antenna array sends and opens sub-antenna U25, closes other sub-antennas, three-dimensional array are receiving label statistics
After the channel control instruction that unit issues, sub-antenna U25 is opened by array control module and closes other sub-antennas.Sub-antenna
U25 sends the tag queries radiofrequency signal of tag read cells modulate and receives the signal of set of tags interior label return.From sub- day
In the return signal that line U25 is received, tag read unit extracts 4 label informations:
<NNT10MM71 NNT11MM69 NNT01MM84 NNT02MM85>
■U26
Label statistic unit issues the instruction of statistics sub-antenna U26 to tag read unit, and label statistic unit is to three-dimensional
The channel control instruction that antenna array sends and opens sub-antenna U26, closes other sub-antennas, three-dimensional array are receiving label statistics
After the channel control instruction that unit issues, sub-antenna U26 is opened by array control module and closes other sub-antennas.Sub-antenna
U26 sends the tag queries radiofrequency signal of tag read cells modulate and receives the signal of set of tags interior label return.From sub- day
In the return signal that line U26 is received, tag read unit extracts 7 label informations:
<NNT11MM69 NNT08MM74 NNT02MM75 NNT03MM79 NNT06MM85 NNT05MM86
NNT01MM56>
■U27
Label statistic unit issues the instruction of statistics sub-antenna U27 to tag read unit, and label statistic unit is to three-dimensional
The channel control instruction that antenna array sends and opens sub-antenna U27, closes other sub-antennas, three-dimensional array are receiving label statistics
After the channel control instruction that unit issues, sub-antenna U27 is opened by array control module and closes other sub-antennas.Sub-antenna
U27 sends the tag queries radiofrequency signal of tag read cells modulate and receives the signal of set of tags interior label return.From sub- day
In the return signal that line U27 is received, tag read unit extracts 6 label informations:
<NNT11MM53 NNT01MM75 NNT12MM78 NNT09MM82 NNT02MM73 NNT10MM63>
■U28
Label statistic unit issues the instruction of statistics sub-antenna U28 to tag read unit, and label statistic unit is to three-dimensional
The channel control instruction that antenna array sends and opens sub-antenna U28, closes other sub-antennas, three-dimensional array are receiving label statistics
After the channel control instruction that unit issues, sub-antenna U28 is opened by array control module and closes other sub-antennas.Sub-antenna
U28 sends the tag queries radiofrequency signal of tag read cells modulate and receives the signal of set of tags interior label return.From sub- day
In the return signal that line U28 is received, tag read unit extracts 4 label informations:
<NNT06MM68 NNT03MM72 NNT04MM82 NNT09MM89>
■U29
Label statistic unit issues the instruction of statistics sub-antenna U29 to tag read unit, and label statistic unit is to three-dimensional
The channel control instruction that antenna array sends and opens sub-antenna U29, closes other sub-antennas, three-dimensional array are receiving label statistics
After the channel control instruction that unit issues, sub-antenna U29 is opened by array control module and closes other sub-antennas.Sub-antenna
U29 sends the tag queries radiofrequency signal of tag read cells modulate and receives the signal of set of tags interior label return.From sub- day
In the return signal that line U29 is received, tag read unit extracts 3 label informations:
<NNT01MM73 NNT10MM82 NNT11MM84>
■U210
Label statistic unit issues the instruction of statistics sub-antenna U210 to tag read unit, and label statistic unit is to three-dimensional
The channel control instruction that antenna array sends and opens sub-antenna U210, closes other sub-antennas, three-dimensional array are receiving label system
After counting the channel control instruction that unit issues, sub-antenna U210 is opened by array control module and closes other sub-antennas.Sub- day
Line U210 sends the tag queries radiofrequency signal of tag read cells modulate and receives the signal of set of tags interior label return.From son
In the return signal that antenna U210 is received, tag read unit extracts 4 label informations:
<NNT03MM72 NNT05MM85 NNT06MM82 NNT07MM73>
According to different poll rule, statistical method and output mode, system supports following six kinds of configurations, in actual use
It is disposed according to demand using one such.
Poll rule:
Configuration one, configuration two and configuration three are all made of memoryless poll rule, and successively poll is three-dimensional for label statistic unit
Antenna element antenna U21, U22 to U210.
Configuration three, configuration four and configuration are without the poll rule for being all made of memory, when system first time poll, label statistics
Unit successively poll three-dimensional array sub-antenna U21, U22 to U210.Since sub-antenna U21 reads 4 label informations, U22
5 are read, U23 reads 8, and U24 reads 3, and U25 reads 4, and U26 reads 7, and U27 reads 6,
U28 reads 4, and U29 reads 3, and U210 reads 4.Next time in poll, according to U23, U26, U27, U22, U21,
The sequence of U25, U28, U210, U24, U29 carry out.Hereafter the number of tags returned again according to each sub-antenna is adjusted suitable
Sequence.
Statistical method:
Configuration one and configuration four are counted using binary system, and it is as follows that label statistic unit initializes local label status list:
| T01 | T02 | T03 | T04 | T05 | T06 | T07 | T08 | T09 | T10 | T11 | T12 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The first behavior tags unique identifier accords in table, the second behavior state, wherein 0 indicates to be not present, 1 indicates exist.
After sub-antenna U21 end of polling(EOP), status list updates are as follows:
| T01 | T02 | T03 | T04 | T05 | T06 | T07 | T08 | T09 | T10 | T11 | T12 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 |
After sub-antenna U22 end of polling(EOP), status list updates are as follows:
| T01 | T02 | T03 | T04 | T05 | T06 | T07 | T08 | T09 | T10 | T11 | T12 |
| 0 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 1 |
After sub-antenna U23 end of polling(EOP), status list updates are as follows:
| T01 | T02 | T03 | T04 | T05 | T06 | T07 | T08 | T09 | T10 | T11 | T12 |
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
When using memoryless poll pattern, after executing U23 end of polling(EOP), all labels are counted to exist at this time, are
System can stop current polling procedure, into output step.When as using there is memory poll pattern, in non-initialization poll, it is
System can stop current polling procedure, into output step；In the initialization polling procedure for having memory pattern, system continues to take turns
It askes until all sub-antennas are polled to.
Configuration two, configuration three, configuration five and configuration six initialize local label shape using set statistics, label statistic unit
State is listed as follows, wherein 0 indicates to be not present, other numerical value indicate to receive the energy size of signal, and unit is-dbm.
After sub-antenna U21 end of polling(EOP), status list is updated to
| U21 | U22 | U23 | U24 | U25 | U26 | U27 | U28 | U29 | U210 | |
| T01 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T02 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T03 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T04 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T05 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T06 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T07 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T08 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T09 | 75 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T10 | 70 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T11 | 65 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T12 | 80 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
After sub-antenna U22 end of polling(EOP), status list is updated to
| U21 | U22 | U23 | U24 | U25 | U26 | U27 | U28 | U29 | U210 | |
| T01 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T02 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T03 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T04 | 0 | 63 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T05 | 0 | 83 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T06 | 0 | 81 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T07 | 0 | 75 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T08 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T09 | 75 | 79 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T10 | 70 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T11 | 65 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T12 | 80 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
After sub-antenna U23 end of polling(EOP), status list is updated to
| U21 | U22 | U23 | U24 | U25 | U26 | U27 | U28 | U29 | U210 | |
| T01 | 0 | 0 | 84 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T02 | 0 | 0 | 75 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T03 | 0 | 0 | 65 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T04 | 0 | 63 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T05 | 0 | 83 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T06 | 0 | 81 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T07 | 0 | 75 | 68 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T08 | 0 | 0 | 73 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T09 | 75 | 79 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T10 | 70 | 0 | 75 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T11 | 65 | 0 | 81 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| T12 | 80 | 0 | 88 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
It is similar with binary system statistics, when using memoryless poll pattern, after executing U23 end of polling(EOP), all labels at this time
It is counted to exist, system can stop current polling procedure, into output step.When as using there is memory poll pattern,
In non-initialization poll, system can stop current polling procedure, into output step；In the initialization poll for having memory pattern
In the process, system continues poll until all sub-antennas are polled to.
In having memory pattern initialization poll, the table after all sub-antennas of poll is as follows.
Output mode (by taking previous tag state list as an example):
Configuration one, configuration two, configuration four and configuration five is summarize output mode, and label statistical module judges in this mode
After poll stops, being exported according to tag state list:
Current statistic region shares 12, label, be respectively T01, T02, T03, T04, T05, T06, T07, T08, T09,
T10、T11、T12。
Six details output modes of configuration three and configuration, after label statistical module judges that poll stops in this mode, root
It is exported according to tag state list:
Current statistic region shares 12, label.
Label T01: it is likely located at the antenna coverage U26；
Label T02: it is likely located at the antenna coverage U23, U26, U27；
Label T03: it is likely located at the antenna coverage U23, U28, U210；
Label T04: it is likely located at the antenna coverage U22；
Label T05: it is likely located at the antenna coverage U22, U26, U210；
Label T06: it is likely located at the antenna coverage U24, U28；
Label T07: it is likely located at the antenna coverage U22, U23, U210；
Label T08: it is likely located at the antenna coverage U23, U26；
Label T09: it is likely located at the antenna coverage U21, U22, U27；
Label T10: it is likely located at the antenna coverage U21, U25, U27；
Label T11: it is likely located at the antenna coverage U27；
Label T12: it is likely located at the antenna coverage U21, U27；
Using the statistical method of traditional portable antenna, there is very big probability leakage statistics situation occur, and in order to ensure system
The reliability of meter generally requires to carry out repeatedly mobile and multiple inquiry operation, have compared with the present invention in accuracy and speed compared with
Big gap.
The present invention utilizes three-dimensional array without coverage hole characteristic, can be with express statistic in the three-dimensional array area of coverage
All tag states effectively overcome the uncertainty in the intensive label of random distribution on statistical space, improve label
The accuracy and speed of statistics can be applied in environment of the number of tags much larger than reading capability of tag read unit.This
Outside, in system composition, the present invention can substantially be compatible with the component of existed system, be counted by upgrading existing or newly-increased label
Unit and increase three-dimensional array can realize higher performance boost with lower cost input.
The present invention is had been described in detail above with reference to the accompanying drawings, but those skilled in the art should be understood that specification
It is for explaining claim, protection scope of the present invention is subject to claim, on the basis of the present invention, any to be done
Modifications, equivalent substitutions and improvements etc. all should be in required protection scope.
Claims (9)
1. a kind of tag location statistical system based on three-dimensional array, characterized by comprising:
Set of tags, the set of tags include at least one label, and each label has unique identifier and can send and receive
Radio signal；The set of tags can in a three-dimensional space random distribution
Three-dimensional array, the three-dimensional array are made of multiple sub-antennas and array control module, the multiple sub-antenna edge
The deployment of one three-dimensional space edge, each sub-antenna there is unique mark, three-dimensional array is from label statistic unit
Control instruction is received, radiofrequency signal that tag read unit generates is launched outward by the sub-antenna specified, and by specified son
The Tag Radio Frequency signal that antenna returns is sent to tag read unit；
Tag read unit, the tag read unit include Transmit Receive Unit and baseband modulation and demodulation unit, the label
Read-write cell generates radiofrequency signal and exports to three-dimensional array from label statistic unit acquisition instruction, and demodulates three-dimensional array
The Tag Radio Frequency signal of return, the demodulation is based on each sub-antenna mark and corresponding reception radiofrequency signal, by extraction
Tags unique identifier symbol and each sub-antenna received signal strength are sent to label statistic unit；
Label statistic unit, the label statistic unit has three-dimensional array control and label Statisti-cal control ability, to three-dimensional
The array control module sendaisle control instruction of antenna array sends label statistics instruction to tag read unit, and from label
Read-write cell obtains the label information returned, carries out label statistics；The label statistic unit is returned according to tag read unit
Tags unique identifier and each sub-antenna received signal strength calculate corresponding label whether be located at one three-dimensional space.
2. a kind of label statistical method based on three-dimensional array, characterized by comprising:
A01, label statistic unit starting label statistics, the tag state list of init Tag statistic unit local, this terrestrial reference
Sign the unique identifier in status list comprising all known labels；
A02, label statistic unit send label to tag read unit and count sign on, according to poll rule, to three-dimensional day
Linear array sendaisle control instruction, order open or close three-dimensional array sub-antenna, start sub-antenna poll；
A03, tag read unit receive the label statistics sign on of label statistic unit sending, modulate and generate label and look into
Ask radiofrequency signal, output to three-dimensional array；Three-dimensional array receives the channel control instruction of label statistic unit sending, hands over
It is handled by array control module, array control module opens or closes specified three-dimensional array sub-antenna；
A04, three-dimensional array receive the tag queries radiofrequency signal of tag read unit sending, should through array control module
Signal is forwarded to the sub-antenna of specified opening, and launches from the sub-antenna of specified opening；
A05, multiple labels receive the tag queries radiofrequency signal of three-dimensional array transmitting, respectively responsive tags inquiry radio frequency letter
Number, it include the unique identifier of respective label in response signal；
A06, three-dimensional array receive the radiofrequency signal of label return by open sub-antenna, will mark through array control module
Label radiofrequency signal is sent to tag read unit；
A07, tag read unit demodulate the Tag Radio Frequency signal returned from three-dimensional array, by the tags unique identifier of extraction
The label informations such as symbol, return signal intensity are sent to label statistic unit；
After A08, label statistic unit receive the label information of tag read unit return, start timer, and according to setting
Statistical update local label status list；
A09, label statistic unit wait t ms；
A10, label statistic unit judge whether tag read unit is sending label data back to, jump to if sending data
A09 step, as no data is sent back to, then it is assumed that the label in the current sub-antenna area of coverage, which has counted, to be finished, and A11 is continued to execute；
A11, label statistic unit, which check whether, has met poll stop condition, according to poll if not meeting poll stop condition
The next sub-antenna of criterion poll, go to step A02, and step A12 is continued to execute if meeting poll stop condition；
A12, label statistic unit are set according to output mode, export current statistic region interior label state.
3. the label statistical method according to claim 2 based on three-dimensional array, it is characterised in that: the step
Poll rule is the memoryless poll rule of fair priority in A02, and each poll is pressed serial number and is incremented by from the 1st sub- antennae polling
To n-th of sub-antenna.
4. the label statistical method according to claim 2 based on three-dimensional array, it is characterised in that: the step
Poll rule is that performance priority has a memory poll rule in A02, is incremented by by serial number from the 1st sub- antennae polling when initial poll
To n-th of sub-antenna, follow-up poll is then carried out according to the number of tags that each sub-antenna returns from more to less, and same label number is then
According to sub-antenna serial number, small preferential of antenna serial number.
5. the label statistical method according to claim 2 based on three-dimensional array, it is characterised in that: the step
Statistical is the preferential binary system statistics of storage in A08, some label is only saved in local label status list and is existed or not
The label of existing information, 0 expression this unique identifier expression is not present, and 1 indicates that the label that this unique identifier indicates exists,
When the unique identifier of return and the unique identifier in local label status list to it is corresponding when it is then that the unique identifier is corresponding
Tag state set 1, label statistic unit is that all sub-antennas safeguard a tag state list jointly.
6. the label statistical method according to claim 2 based on three-dimensional array, it is characterised in that: the step
Statistical is to count using preferential set in A08, saves some label in all sub-antennas in local label status list
Existing status information in the area of coverage, the label that { 1,0 } indicates that this unique identifier indicates are not present in 1 area of coverage of sub-antenna
In, { 1,81 } indicate this unique identifier indicate label be present in 1 area of coverage of sub-antenna, and return signal intensity be-
81dbm, the label that { 2,0 } indicate that this unique identifier indicates are not present in 2 area of coverage of sub-antenna, and { 2,63 } indicate that this is unique
The label that identifier indicates is present in 2 area of coverage of sub-antenna, and return signal intensity is -63dbm, and so on；Label system
Meter unit is that each sub-antenna separately maintains a tag state list.
7. the label statistical method according to claim 2 based on three-dimensional array, it is characterised in that: the step
Poll stop condition is that all known labels mark and are or traversed all sub-antennas of three-dimensional array in A11, when
When using there is memory poll rule, initial poll stop condition is forced to traversal all sub-antennas of three-dimensional array.
8. the label statistical method according to claim 2 based on three-dimensional array, it is characterised in that: the step
Output mode in A12 is to summarize mode, the number of tags that is counted in label statistical module output current statistic area and
The unique identifier of each label.
9. the label statistical method according to claim 2 based on three-dimensional array, it is characterised in that: wanted when using right
Described in asking 6 when set statistical, the output mode in the step A12 supports detail modes, in this mode, label
Statistical module not only exports the unique identifier of the number of tags counted in current statistic area and each label, additionally it is possible to
Tag state list according to set statistics provides the region that each label is distributed roughly；Label just omits distributed areas according to return
Signal strength divide as follows:
The big 10dbm of signal strength that label is returned in other sub-antennas of signal intensity ratio that some sub-antenna returns, then at the beginning of label
The label that slightly distributed areas only prompt the unique identifier to indicate is located in the sub-antenna overlay area；
The difference of signal strength and maximum value that label is returned in multiple sub-antennas is within 10dbm, then label just slightly distributed areas
The label for prompting the unique identifier to indicate is likely located in multiple sub-antenna overlay areas；
The small 10dbm of signal strength that label is returned in other sub-antennas of signal intensity ratio that some sub-antenna returns, then at the beginning of label
The sub-antenna is ignored in slightly distributed areas, and the label for not prompting the unique identifier to indicate is located in the sub-antenna overlay area.
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Application publication date: 20190219 |