CN101630356B - Method and device for allocating antenna of radio frequency identification system - Google Patents
Method and device for allocating antenna of radio frequency identification system Download PDFInfo
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- CN101630356B CN101630356B CN2008101358776A CN200810135877A CN101630356B CN 101630356 B CN101630356 B CN 101630356B CN 2008101358776 A CN2008101358776 A CN 2008101358776A CN 200810135877 A CN200810135877 A CN 200810135877A CN 101630356 B CN101630356 B CN 101630356B
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Abstract
The invention discloses a method and a device for allocating an antenna of a radio frequency identification system, wherein the method comprises the following steps: judging whether the radio frequency identification system is restricted in the positive direction or in the negative direction; determining the coverage area of the antenna and sampling points in the coverage area, and assigning a corresponding weighted value for each sampling point; traversing the unknown parameters and each sampling point of the antenna, and determining the corresponding weighted value summation of the antenna at different positions or angles; and using the position and the angle corresponding to the maximum weighted value summation as the optimal allocation position and angle for the antenna. Through the method and the device, a technician can determine the optimal allocation scheme for the antenna, shorten the time for adjusting the antenna allocation on the spot, and effectively improve the efficiency.
Description
Technical field
The present invention relates to radio-frequency recognition system, more specifically, relate to a kind of allocating antenna method and device that is used for RF identification (Radio Frequency Identification abbreviates RFID as) system.
Background technology
RFID is a kind of contactless automatic identification technology, and it is through the automatic recognition objective object of radiofrequency signal and obtain related data, and identification work does not need manual intervention, can work in various rugged surroundings.Rfid system can be discerned swiftly passing object, and can discern a plurality of labels simultaneously, and is swift and convenient to operate, is widely used.
Usually, basic rfid system is made up of three parts: label (Tag), to form by coupling element and chip, and each label has unique electronic code, attached to being used for the recognition objective object on the object; Reader (Reader) is used to read (can also write sometimes) label information, can be designed to hand-held or fixed; Antenna (Antenna) is used between label and reader, transmitting radiofrequency signal.
At present, in the rfid system of most of ultrahigh frequencies and microwave frequency band, allocating antenna position and angle generally rely on engineering experience to debug repeatedly at the scene by the staff and obtain.This method wastes time and energy, and often can't reach optimal effectiveness.Even use some network planning software to carry out the emulation estimation, the single job process also can only calculate antenna in some positions and angle institute region covered, and can't calculate position and the angle that antenna should be disposed according to predetermined coverage.
Summary of the invention
Deployment and the adjustment of considering antenna in the present RFID technology are wasted time and energy; Can't reach the problem of optimal effectiveness and propose the present invention; For this reason, the object of the present invention is to provide a kind of allocating antenna method and device that is used for rfid system, in order to address the above problem.
For reaching this purpose, according to an aspect of the present invention, a kind of allocating antenna method that is used for rfid system is provided, comprising: judge that rfid system is that forward direction is limited or oppositely limited; Confirm the overlay area of antenna and the sample point in the overlay area, and give corresponding weighted value each sample point; Unknown parameter and each sample point of traversal antenna, confirm antenna under different positions and/or angle corresponding weight with; With weight limit and corresponding position and angle optimal deployment position and angle as antenna.
Preferably, above-mentioned judgement rfid system is limited or reverse limited being specially of forward direction: if the difference of antenna emissive power and label starting power poor less than tag reflection power and the reverse demodulation sensitivity of reader then is that forward direction is limited; Otherwise it is limited for oppositely.
Preferably, when rfid system adopted active label, the label starting power was the demodulation sensitivity of active label.
Preferably, when above-mentioned rfid system forward direction is limited, weighted value is set according to the relative size of label received power and label starting power; Rfid system is reverse when limited, according to the relative size of reader received power and the reverse demodulation sensitivity of reader weighted value is set.
Preferably, the gap of above-mentioned label received power and label starting power is big more, and weighted value is high more.
Preferably, above-mentioned unknown parameter comprise following one of at least: the three-dimensional coordinate of antenna, level inclination, vertical dip angle, polarised direction.
Preferably; Travel through each sample point; Confirm antenna under different positions and/or angle corresponding weight with specifically comprise: poor according to the residing horizontal level coordinate of each sample point and label received power and label starting power obtains the weighted value of each sample point correspondence; For different antennas position and angle, the weighted value with each sample point adds up through pre-defined algorithm respectively, obtain weight with.
According to another aspect of the present invention, a kind of allocating antenna device that is used for rfid system is provided, this device comprises: judge module is used to judge that rfid system is that forward direction is limited or oppositely limited; Determination module is used for confirming the overlay area of antenna and the sample point of overlay area; The assignment module is used for giving corresponding weighted value to each sample point; Computing module is used to travel through the unknown parameter and each sample point of antenna, confirm antenna under different positions or angle corresponding weight with; Deployment module is used for weight limit and corresponding position and angle optimal deployment position and the angle as antenna.
Preferably; Judge module is used for judging that according to following rule judgment rfid system is that forward direction is limited or oppositely limited: if the difference of antenna emissive power and label starting power poor less than tag reflection power and the reverse demodulation sensitivity of reader then is that forward direction is limited; Otherwise it is limited for oppositely; And when judge module judged that the rfid system forward direction is limited, the assignment module was used for according to the relative size of label received power and label starting power weighted value being set; Judge that when judge module rfid system is reverse when limited, the assignment module is provided with weighted value according to the relative size of reader received power and the reverse demodulation sensitivity of reader.
Preferably, computing module further comprises: the weighted value computing module, be used for poor according to the residing horizontal level coordinate of each sample point and label received power and label starting power, and obtain the corresponding weighted value of each sample point; Weight and computing module are used for for different antennas position and angle, and the weighted value with each sample point adds up through pre-defined algorithm respectively, obtain weight with.
Technique scheme has the following advantages or beneficial effect: the technician can calculate the optimal deployment scheme of antenna accurately, fast and automatically; Carry out engineering construction by this scheme, can shorten widely in the engineering site adjustment needed time of allocating antenna, and improve construction quality effectively.
Other features and advantages of the present invention will be set forth in instructions subsequently, and, partly from instructions, become obvious, perhaps understand through embodiment of the present invention.The object of the invention can be realized through the structure that in the instructions of being write, claims and accompanying drawing, is particularly pointed out and obtained with other advantages.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of instructions, is used to explain the present invention with embodiments of the invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is according to the allocating antenna method that is used for rfid system shown in the inventive method embodiment;
Fig. 2 is a concrete application scenarios synoptic diagram that adopts method shown in Figure 1, adopts the single antenna deployment way;
Fig. 3 is the predetermined coverage area according to antenna shown in Figure 2;
Fig. 4 be according to antenna vertical dip angle phi shown in Figure 2 and weight and graph of relation;
Fig. 5 is according to the allocating antenna device synoptic diagram that is used for rfid system shown in apparatus of the present invention embodiment.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for explanation and explains the present invention, and be not used in qualification the present invention.
According to the embodiment of the invention; A kind of allocating antenna scheme that is used for rfid system is provided, and it utilizes known tag parameter and part allocating antenna parameter according to the requirement of coverage; Aerial position undetermined and angle are traveled through, to obtain best allocating antenna position and angle.
Method embodiment
Fig. 1 is according to the allocating antenna method that is used for rfid system shown in the embodiment of the invention.As shown in Figure 1, a kind of allocating antenna method that is used for rfid system, this method is applicable to other communication system too, comprising:
S102 judges that radio-frequency recognition system is that forward direction is limited or oppositely limited; Particularly, if the difference of antenna emissive power and label starting power poor less than tag reflection power and the reverse demodulation sensitivity of reader then is that forward direction is limited; Otherwise it is limited for oppositely;
S104 confirms the overlay area of antenna and the sample point in the overlay area, and gives corresponding weighted value to each sample point; Particularly, when the rfid system forward direction is limited, weighted value is set according to the relative size of label received power and label starting power; Reverse when limited when rfid system, according to the relative size of reader received power and the reverse demodulation sensitivity of reader weighted value is set.The gap of label received power and label starting power is big more, and weighted value is high more.Need to prove that when rfid system adopted active label, the starting power of label was replaced by the demodulation sensitivity of active label;
S106, unknown parameter and each sample point of traversal antenna, confirm antenna under different positions or angle corresponding weight with;
S108 is with weight limit and corresponding position and angle optimal deployment position and the angle as antenna.
In the following description, will be limited as example with the rfid system forward direction describes.
In step S104, when confirming sample point,, to be sampled in the overlay area that antenna is predetermined according to the project needs, the quantity of sample point is determined by actual demand, for example, puts and 0.1 meter of dot spacing; Then, according to the position of each sample point and at the sample point place gap of the starting power of received power and the label of label, weighted value systematically is set.Such as, be in the sample point in the predetermined centre position, overlay area of antenna, maybe be bigger to the influence of recognition effect, weighted value is high; For another example, the sample point place that the gap of the received power of label and the starting power of label is small, the possibility that is identified is just lower, so weighted value is lower.
For some location parameter of antenna, decide owing to receive the influence of engineering specifications, still, in S106, need travel through for the parameter of the unknown.Unknown parameter comprise following one of at least: the three-dimensional coordinate of antenna, level inclination, vertical dip angle and polarised direction.
The combination of each group aerial position and angle, all correspondence a deployment scheme.Estimate the good and bad method of deployment scheme and be exactly accumulated weight with.In step S106, weight and ask for and comprise: poor according to the residing horizontal level coordinate of each sample point and label received power and label starting power obtains the corresponding weighted value of each sample point; For different antennas position and angle, respectively the weighted value of each sample point is added up through pre-defined algorithm (preferably, addition), obtain weight with.
At last, like step S108, with weight limit and corresponding position and angle optimal deployment position and angle as antenna.
Fig. 2 is one of concrete application scenarios of method shown in Figure 1 " tame school is logical " synoptic diagram, adopts the deployment scheme of single antenna.According to practical project constraint condition, to dispose in each related parameter of antenna 1, the vertical bank angle can't be confirmed, so the traversal that need count to the vertical bank angle as unknown parameter.Particularly, under scene shown in Figure 2, realize the present invention through following operation:
At first, adopt outdoor version reader and school badge label 2, through calculating discovery, this link forward direction is limited, so, with the starting power of label as basis for estimation.
Secondly, need to confirm region covered, as shown in Figure 3, define this coverage and be 3 meters long in front of the door; 3 meters wide horizontal zones can be thought, the each point no less important; And if the power that arrives these points surpassed the starting power of label, then weight counts 1, otherwise weight counts 0.
Because antenna 1 is positioned on the crossbeam of gate center, therefore, its position confirms, and this scope also is symmetrical, and therefore, its level inclination confirms to have only vertical dip angle phi undetermined, will travel through this unknown parameter.Each vertical dip angle for antenna; All corresponding to a deployment scheme, like this, for each point in horizontal coverage of label 2 under this vertical dip angle; Ask its received power; Contrast the size of itself and starting power, obtain the weighted value of this point, obtain after the accumulative total antenna tilt phi shown in Figure 4 and weight and graph of relation.
Curve through Fig. 4 can find out, when the vertical dip angle of antenna 1 is 50 when spending, and its weight and maximum; That is to say that the antenna vertical dip angle of this moment can satisfy identification requirement to greatest extent, therefore, this allocating antenna position and angle are exactly the most reliable deployment scheme.
Facts have proved, adopt such allocating antenna method, the recognition effect is very good, as long as the school badge label is normally worn, the situation of skip just can not take place.
Device embodiment
According to the embodiment of the invention, a kind of allocating antenna device that is used for rfid system is provided.
Fig. 5 is according to the allocating antenna device synoptic diagram that is used for rfid system shown in apparatus of the present invention embodiment; As shown in Figure 5; The allocating antenna device that is used for rfid system according to the embodiment of the invention comprises: judge module 502 is used to judge that rfid system is that forward direction is limited or oppositely limited; Determination module 504 is used for confirming the overlay area of antenna and the sample point of overlay area; Assignment module 506 is used for giving corresponding weighted value to each sample point; Computing module 508 is used to travel through the unknown parameter and each sample point of antenna, confirm antenna under different positions or angle corresponding weight with; Deployment module 510 is used for weight limit and corresponding position and angle optimal deployment position and the angle as antenna.
Wherein, Judge module 502 is used for judging that according to following rule judgment rfid system is that forward direction is limited or oppositely limited: if the difference of antenna emissive power and label starting power poor less than tag reflection power and the reverse demodulation sensitivity of reader then is that forward direction is limited; Otherwise it is limited for oppositely.
When judge module 502 judged that the rfid system forward direction is limited, assignment module 506 was used for according to the relative size of label received power and label starting power weighted value being set; Judge that when judge module 502 rfid systems are reverse when limited, assignment module 506 is provided with weighted value according to the relative size of reader received power and the reverse demodulation sensitivity of reader.
Preferably, computing module 508 further comprises: weighted value computing module 508-1, be used for poor according to the residing horizontal level coordinate of each sample point and label received power and label starting power, and obtain the corresponding weighted value of each sample point; Weight and computing module 508-2 are used for for different antennas position and angle, and the weighted value with each sample point adds up through pre-defined algorithm respectively, obtain weight with.
In sum; Adopt the method and the device of the embodiment of the invention; Can calculate the optimal deployment scheme of antenna accurately, fast and automatically, carry out engineering construction and can shorten widely, and improve construction quality effectively in the engineering site debugging needed time of antenna.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. an allocating antenna method that is used for radio-frequency recognition system is characterized in that, comprising:
Judge that radio-frequency recognition system is that forward direction is limited or oppositely limited;
Confirm the overlay area of antenna and the sample point in the overlay area, and give corresponding weighted value each sample point;
Travel through unknown parameter and said each sample point of said antenna, confirm said antenna under different positions and/or angle corresponding weight with;
With weight limit and corresponding position and angle optimal deployment position and angle as said antenna.
2. method according to claim 1 is characterized in that,
Said judgement radio-frequency recognition system is limited or reverse limited being specially of forward direction:
If the difference of antenna emissive power and label starting power is poor less than tag reflection power and the reverse demodulation sensitivity of reader, then be that forward direction is limited; Otherwise limited for oppositely, wherein, when said radio-frequency recognition system adopted active label, said label starting power was the demodulation sensitivity of said active label.
3. method according to claim 2 is characterized in that,
When said radio-frequency recognition system forward direction is limited, said weighted value is set according to the relative size of label received power and said label starting power;
Said radio-frequency recognition system is reverse when limited, according to the relative size of reader received power and the reverse demodulation sensitivity of said reader said weighted value is set.
4. method according to claim 3 is characterized in that, the gap of said label received power and said label starting power is big more, and said weighted value is high more.
5. method according to claim 1 is characterized in that, said unknown parameter comprise following one of at least: the three-dimensional coordinate of said antenna, level inclination, vertical dip angle, polarised direction.
6. method according to claim 1 is characterized in that, travels through said each sample point, confirms said antenna corresponding weight and specifically comprising under different positions and/or angle:
Poor according to the residing horizontal level coordinate of said each sample point and said label received power and said label starting power; Obtain the corresponding weighted value of said each sample point; Wherein, When said radio-frequency recognition system adopted active label, said label starting power was the demodulation sensitivity of said active label;
For different antennas position and angle, the weighted value with each sample point adds up through pre-defined algorithm respectively, obtain said weight with.
7. an allocating antenna device that is used for radio-frequency recognition system is characterized in that, comprising:
Judge module is used to judge that radio-frequency recognition system is that forward direction is limited or oppositely limited;
Determination module is used for confirming the overlay area of antenna and the sample point of overlay area;
The assignment module is used for giving corresponding weighted value to each sample point;
Computing module is used to travel through unknown parameter and said each sample point of said antenna, confirm said antenna under different positions or angle corresponding weight with;
Deployment module is used for weight limit and corresponding position and angle optimal deployment position and the angle as said antenna.
8. device according to claim 7 is characterized in that,
It is that forward direction is limited or oppositely limited that said judge module is used for according to the following said judgement radio-frequency recognition system of rule judgment: if the difference of antenna emissive power and label starting power poor less than tag reflection power and the reverse demodulation sensitivity of reader then is that forward direction is limited; Otherwise limited for oppositely, wherein, when said radio-frequency recognition system adopted active label, said label starting power was the demodulation sensitivity of said active label;
And when said judge module judged that said radio-frequency recognition system forward direction is limited, said assignment module was used for according to the relative size of label received power and said label starting power said weighted value being set; Judge that when said judge module said radio-frequency recognition system is reverse when limited, said assignment module is provided with said weighted value according to the relative size of reader received power and the reverse demodulation sensitivity of said reader.
9. device according to claim 8 is characterized in that, said computing module further comprises:
The weighted value computing module is used for poor according to the residing horizontal level coordinate of said each sample point and said label received power and said label starting power, obtains the corresponding weighted value of said each sample point;
Weight and computing module are used for for different antennas position and angle, and the weighted value with each sample point adds up through pre-defined algorithm respectively, obtain said weight with.
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| US6975615B1 (en) * | 1998-07-03 | 2005-12-13 | Nokia Networks Oy | Data transmission method and mobile telephone system |
| CN2872746Y (en) * | 2005-05-12 | 2007-02-21 | 武汉虹信通信技术有限责任公司 | Dry wire covering straight-amplification station indoor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6975615B1 (en) * | 1998-07-03 | 2005-12-13 | Nokia Networks Oy | Data transmission method and mobile telephone system |
| CN2872746Y (en) * | 2005-05-12 | 2007-02-21 | 武汉虹信通信技术有限责任公司 | Dry wire covering straight-amplification station indoor |
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