CN101872885B - Rapid deploying system and method for a RFID (radio frequency identification devices) antenna - Google Patents
Rapid deploying system and method for a RFID (radio frequency identification devices) antenna Download PDFInfo
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- CN101872885B CN101872885B CN201010185481XA CN201010185481A CN101872885B CN 101872885 B CN101872885 B CN 101872885B CN 201010185481X A CN201010185481X A CN 201010185481XA CN 201010185481 A CN201010185481 A CN 201010185481A CN 101872885 B CN101872885 B CN 101872885B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2216—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in interrogator/reader equipment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/02—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole
- H01Q3/04—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole for varying one co-ordinate of the orientation
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Abstract
The invention discloses a rapid deploying system and a method for a RFID antenna. In the invention, the RFID antenna is deployed by arranging a portal frame structure in an in and out storage environment and utilizing different space positions and angles in the portal frame structure, and the reading performances of the parameter combinations of one or more than one RFID antenna on RFID labels stuck to commodities in the application site environment are compared. In order to optimize the test process and shorten the test time, firstly, the method selects a representative test point through an orthogonal test to conduct a test, secondly, inspects fitting relation between an independent variable and a dependent variable through a zero-level repeated test, subsequently determines the best deploying position of the RFID antenna through a gradient search test and finally replaces a three degree of freedom motor in the test with a fixed support to complete RFID antenna deployment in the environment. The invention provides reliable guarantee for improving the RFID system performance, predicting the deploying effect and optimizing the deploying conditions under complex environmental conditions.
Description
Technical field
The present invention relates to electronic information technical field, relate in particular to a kind of under the complicated applications environment system and method for rapid deployment RFID antenna.
Background technology
The RFID full name is radio-frequency (RF) identification (Radio Frequency Identification), is a kind of non-contact automatic identification technology that utilizes radio-frequency technique to realize.The RFID label has that volume is little, read or write speed is fast, shape is various, long service life, reusable, memory capacity large, can penetrate the characteristics such as non-conductive material, multiple target identification and moving target identification can be realized in conjunction with rfid interrogator, further the tracking of article in the global range and sharing of information can also be realized by the combination with Internet technology.The RFID technology is applied to the industries such as logistics, manufacturing, public information service, can significantly improve management and operational paradigm, reduces cost.
As one of core technology of Internet of Things, the application of RFID technology is very extensive.Complicated applied environment and diversified RFID equipment dispose to rfid system and test has brought new challenge, although can test specially the performance index of each part of rfid system by reference test method reasonable in design and Auto-Test System, but also need benchmark test plan design and test data analysis in using are studied, with economically, scientifically, optimally formulate the testing program of benchmark test, improve testing efficiency, the Changing Pattern of research tested object, obtain more reliable, efficient RFID benchmark test data are for the user provides the aid decision foundation.
Use RFID equipment that the commodity that go out warehouse-in are carried out automatically, in batches, identification is one of most typical application of RFID technology at a distance, can be used for controlling inventory level, determine prolongation and quantity ordered size.In the warehouse-in link, use fixed RFID equipment that material is carried out quantity and check and check, accomplish account phase symbol, and then the deposit position of definite material in the warehouse; In the outbound link, determine deposit position according to the unique identification of outbound commodity, and take out corresponding material according to quantity on order, and then the material that proposes is carried out quantity check and check, mail to the destination., control by the inventory level to enterprise satisfying under the prerequisite that supply chain management requires based on the warehousing management of RFID technology, can improve logistics system efficient, reduce working capital of enterprises, strengthen enterprise competitiveness.
Current generation, when using RFID equipment to finish out the automatic identification of warehouse-in commodity, identification certainty is the outstanding problem that faces.On the one hand, it is different with quantity that different types of commodity are put form during by RFID antenna identification range, and on the other hand, the electromagnetic environment of disposing around the gate of RFID antenna is also different with the space, so is difficult to find a general RFID allocating antenna scheme.Even obtained optimum height, position and the angle of allocating antenna by DCO in the laboratory simulations environment, insecure problem often also can appear identifying when transferring to site environment.Because environment and the deployment conditions of RFID application deployment and site of deployment are closely related, so this class application testing must verify that to system architecture and equipment performance property testing just can finish by utilizing site environment before the deployment at the scene.At present the field test often utilizes exclusive method and trial-and-error method to realize, namely according to operator's experience or the different input combinations of random selection, until stop after producing an acceptable output.There are three problems in this method, and the one, too rely on tester's knowwhy and practical experience, the 2nd, can not determine whether optimal solution of test result, the 3rd, the needed time of unpredictable test.Therefore, also need a kind of science, efficient RFID allocating antenna technology, to solve the problem that exists in the application deployment.
Summary of the invention
A kind of RFID antenna rapid deployment system of the present invention and method, its objective is as the user and provide a kind of at RFID the field environment, particularly come in and go out height, the position of rapid deployment RFID antenna in the lab environment, test macro and the corresponding test optimization method of angle parameter, by testing the optimal spatial deployed position of one or more RFID antennas, for under complicated environmental condition, improving the rfid system performance, effect is disposed in prediction, and optimizing deployment conditions provides reliable assurance.
A kind of RFID antenna rapid deployment system of the present invention and method, its principle is by arrange door type frame structure in the lab environment of coming in and going out, and the different spatial in door type frame structure and angle dispose the RFID antenna, thus the parameter combinations of more one or more RFID antennas under the site of deployment environment to sticking on the recognition performance of the RFID label on the commodity.In order to optimize test process, shorten the testing time, at first choosing representative test point by orthogonal test tests, secondly by the match relation between zero level duplicate test check independent variable and the dependent variable, determine subsequently the optimal deployment position of RFID antenna by gradient search test, the Three Degree Of Freedom motor in will testing at last replaces with fixed support can finish RFID deployed with devices in this environment.
For reaching described purpose, a first aspect of the present invention, provide a kind of RFID antenna rapid deployment system of the present invention to comprise: door type frame structure, the frame guide rail groove, rfid interrogator, the Three Degree Of Freedom motor, the RFID antenna, and the RFID label of pasting on the commodity, wherein door type frame structure places site of deployment to be used to dispose the position of rfid interrogator, one or more frame guide rail groove is fixed on the type frame structure, one or more Three Degree Of Freedom motors are installed on the frame guide rail groove, the RFID antenna is bolted in the top of Three Degree Of Freedom motor, the RFID antenna also links to each other by radio frequency cable with rfid interrogator, under the driving of Three Degree Of Freedom motor, realize and the relative displacement of frame guide rail groove, the variation of vertical angle and level angle, the commodity of having pasted the RFID label are positioned on transport vehicle or the conveyer belt according to the characteristics of putting in using, and the route of setting passing-through door type frame structure, during test, the commodity of having pasted the RFID label are deposited on transport vehicle or the conveyer belt through the type frame structure of moving into one's husband's household upon marriage, rfid interrogator is by RFID antenna recognition value RFID label simultaneously, regulate the parameter change RFID antenna of Three Degree Of Freedom motor and the relative displacement of frame guide rail groove, vertical angle and level angle, rfid interrogator compares the recognition performance of Three Degree Of Freedom motor under different parameters, obtain best recognition result, distinguish result as the aid decision foundation of judging RFID antenna optimal deployment position with this best.
Wherein: the quantity of described frame guide rail groove, Three Degree Of Freedom motor and RFID antenna is equal, on the frame guide rail groove Three Degree Of Freedom motor can only be installed, and a RFID antenna also can only be fixed in a Three Degree Of Freedom motor top.
Wherein: described many frame guide rail grooves are fixed on the type frame structure, can be to be arranged in parallel, to be arranged above and below, to be staggered, and do not have any intersection point between any two frame guide rail grooves.
Wherein: judge that the aid decision of RFID antenna optimal deployment position is according to after obtaining, frame guide rail groove and Three Degree Of Freedom motor are removed from door type frame structure, mounting and fixing bracket on this position, and fixed support and RFID antenna is affixed, make the RFID antenna keep position and the angle of optimal deployment.
For reaching described purpose, a second aspect of the present invention provides a kind of RFID antenna quick deployment method of the RFID of use antenna rapid deployment system, may further comprise the steps:
Step 1: with door type frame structure, frame guide rail groove, rfid interrogator, Three Degree Of Freedom motor, RFID antenna, and the RFID label of pasting on the commodity is arranged in the test environment;
Step 2: be the initial value scope of each Three Degree Of Freedom selection of Motor Three Degree Of Freedom motor and the relative displacement of frame guide rail groove, vertical angle and level angle;
Step 3: factor level and the normalized of determining each Three Degree Of Freedom motor and the relative displacement of frame guide rail groove, vertical angle and level angle;
Step 4: design RFID antenna rapid deployment is tested the quadrature gauge outfit of all parameters, and the recognition performance of rfid interrogator under the combination of Three Degree Of Freedom motor different parameters carried out orthogonal test;
Step 5: utilize least-squares estimation to calculate all parameters with the Three Degree Of Freedom motor as independent variable, with the coefficient vector of rfid interrogator recognition performance as the multiple linear regression equations of dependent variable;
Step 6: according to the factor conspicuousness of all independents variable of Variance Analysis Evaluation Three Degree Of Freedom motor, simplify multiple linear regression equations;
Step 7: the independent variable coding type of each Three Degree Of Freedom motor of substitution and the relative displacement of frame guide rail groove, vertical angle and level angle obtains the multiple linear regression equations of original independent variable;
Step 8: the recognition performance of rfid interrogator under the combination of Three Degree Of Freedom motor different parameters carried out zero level point duplicate test, the degree of fitting of check multiple linear regression equations, if by significance test, then enter step 9, then do not return step 2 by significance test;
Step 9: the recognition performance of rfid interrogator under the combination of Three Degree Of Freedom motor different parameters carried out the gradient search test;
Step 10: according to the optimal position parameters of RFID allocating antenna, frame guide rail groove and Three Degree Of Freedom motor are replaced with fixed support, and fixed support and RFID antenna 5 is affixed, make the RFID antenna keep position and the angle of optimal deployment.
The invention has the beneficial effects as follows:
1) uses the door type frame structure of different size according to the characteristics of the field, can satisfy one, the needs of a plurality of and multilayer RF ID allocating antenna, and after test finishes, only frame guide rail groove and Three Degree Of Freedom motor need to be removed and replace with fixed support after can drop into actual use, a type frame structure directly is retained in the variation that can reduce site environment in the field environment to the impact of RFID equipment room electromagnetic signal;
2) adopt multiple optimization method to improve testing efficiency, comprise that dwindling independent variable initial value scope reduces the composite test number of times, utilizing orthogonal test method further to choose in the test combinations most representative test point tests, utilize gradient search algorithm to have the direction of maximal increment (or decrement) progressively mobile along dependent variable, in order in the shortest stepping number of times, obtain the optimal parameter of RFID allocating antenna, use the uniting of above optimization method so that method of testing science more, test result is also more reliable;
3) because the flexibility on the door type frame structure size, and one or more groups frame guide rail groove and Three Degree Of Freedom motor supportive how, can analyze simultaneously the deployment strategy of one or more RFID antennas in conjunction with the field situation, this also helps to check and the mutually mutual interference that reduces between the RFID antenna, directly provides quick, feasible solution for the user.
Description of drawings
Fig. 1 is RFID antenna rapid deployment system schematic diagram provided by the invention.
Fig. 2 is RFID antenna quick deployment method flow chart provided by the invention.
Fig. 3 is the exemplary plot that RFID antenna quick deployment method provided by the invention is determined optimal location.
The main element explanation
1 type frame structure
2 frame guide rail grooves
3 rfid interrogators
4 Three Degree Of Freedom motors
5 RFID antennas
The RFID label of pasting on 6 commodity
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
As shown in Figure 1, Fig. 1 is RFID antenna rapid deployment system schematic diagram provided by the invention, comprise a type frame structure 1, frame guide rail groove 2, rfid interrogator 3, Three Degree Of Freedom motor 4, RFID antenna 5, and the RFID label 6 of pasting on the commodity, wherein door type frame structure 1 places site of deployment to be used to dispose the position of rfid interrogator 3, one or more frame guide rail groove 2 is fixed on the type frame structure 1, one or more Three Degree Of Freedom motors 4 are installed on the frame guide rail groove 2, for example the user wishes when commodity are disposed two RFID antenna 5 recognition value RFID labels 6 by the both sides of position, then fix two frame guide rail grooves 2 at two body side frames of door type frame structure 1, and two Three Degree Of Freedom motors 4 are installed, thereby realize that Three Degree Of Freedom motor 4 is about door type frame structure 1 both sides, about and elevating movement; In like manner, if the user wishes disposing more RFID antennas 5 by the position to guarantee the reliability of recognition value RFID label 6, then dispose as required the quantity of antenna and fix many frame guide rail grooves 2 in door type frame structure 1, and get final product at Three Degree Of Freedom motor 4 of every frame guide rail groove 2 installations.RFID antenna 5 is bolted in the top of Three Degree Of Freedom motor 4, RFID antenna 5 also links to each other by radio frequency cable with rfid interrogator 3, realizes the variation with 2 relative displacements of frame guide rail groove, vertical angle and level angle under the driving of Three Degree Of Freedom motor 4.The commodity of having pasted RFID label 6 are positioned on transport vehicle or the conveyer belt according to the characteristics of putting in using, and set the route of passing-through door type frame structure 1.During test, the commodity of having pasted RFID label 6 are deposited on transport vehicle or the conveyer belt through the type frame structure 1 of moving into one's husband's household upon marriage, rfid interrogator 3 is by RFID antenna 5 recognition value RFID labels 6 simultaneously, regulate the parameter change RFID antenna 5 of Three Degree Of Freedom motor 4 and relative displacement, vertical angle and the level angle of frame guide rail groove 2, the recognition performance of 3 pairs of Three Degree Of Freedom motors of rfid interrogator under different parameters compares, obtain best recognition result, distinguish result as the aid decision foundation of judging RFID antenna 5 optimal deployment positions with this best.
In one embodiment of the invention, door type frame structure 1 is comprised of three groups of support bars, be respectively the left side column, right side column and top crossbeam, wherein the height of left side column and right side column is at 2.5m, the length of top crossbeam is at 2m, respectively be fixed with a frame guide rail groove 2 on each support bar, the frame guide rail groove 2 long 1.9m of left side column and right side column, the frame guide rail groove 2 long 1.4m of top crossbeam, frame guide rail groove 2 two ends apart from the support bar summit respectively apart from 30cm, be separately installed with a Three Degree Of Freedom motor 4 on each frame guide rail groove 2, can move (D represents with displacement) along frame guide rail groove 2, and realize the rotation (θ represents with angle) of vertical frame guide-track groove 2 directions and along the rotation (φ represents with angle) of frame guide rail groove 2 directions.There is screw on the top of Three Degree Of Freedom motor 4, can be bolted RFID antenna 5.In the test, the user at first determines RFID label 6, the product type of rfid interrogator 3 and RFID antenna 5, then RFID label 6 is pasted on survey fixed position in the commodity packaging, and pile up on means of transportation with common stacking form, again rfid interrogator 3 and three RFID antennas 5 are fixed on the type frame structure 1, by the dynamic adjustment to RFID antenna 5 locus and angle, can obtain the recognition performance of the 3 pairs of a plurality of RFID labels 6 of rfid interrogator under the different parameters combination, thereby make things convenient for the best position of user's selectivity and angle to dispose RFID antenna 5.
In another embodiment of the present invention, it is a large bag that is of a size of (length) 3.2m * (wide) 1.0m * (height) 1.5m that the commodity of 30 attaching rfid tags 6 are beaten, and goes out warehouse-in by forklift transport.In this example because commodity packaging is longer, in order to guarantee the identification to all commodity, two groups of totally four RFID antennas 5 before and after need to disposing in position, the door left and right sides, storehouse.For this reason, door type frame structure 1 is comprised of four groups of support bars, be respectively left side front column, left side rear column, right side front column and right side rear column, the column height is 2m, respectively be fixed with the frame guide rail groove 2 of a long 1.4m on each support bar, frame guide rail groove 2 two ends respectively apart from 30cm, are separately installed with a Three Degree Of Freedom motor 4 apart from the support bar summit on each frame guide rail groove 2, the top is connected with RFID antenna 5 by bolt.Like this, adjust deployed position and the angle of four RFID antennas 5 by controlling four groups of Three Degree Of Freedom motors 4, just can obtain rfid interrogator 3 by test result and disturb each other minimum, the best RFID allocating antenna parameter of recognition performance.When in site of deployment, using RFID antenna rapid deployment system provided by the invention, frame guide rail groove 2 and Three Degree Of Freedom motor 4 are replaced with fixed support, and according to optimum deployment parameters that fixed support and RFID antenna 5 is affixed, just can in site of deployment, use for a long time.
RFID antenna rapid deployment system carries out combined test by deployed position and angle to a plurality of RFID antennas 5, a plurality of test independents variable can be integrated in the test model to analyze simultaneously.But the cost of all independents variable being carried out combined test is very high.Three the RFID antennas of supposing to prepare for deployment as shown in Figure 1, the variable of each RFID antenna 5 comprises displacement D, angle θ and angle φ, will have like this 9 independents variable.Be assumed to be each independent variable and only get 5 levels, this will produce 5
9=1953125 kinds of combinations, even every group of test only needed for 10 seconds, testing whole combinations also needs 226 day time just can finish, and this shows that time and cost that full combined test consumes will be intolerable, has also lost the value and significance of test.Therefore also need to solve the multiple shot array problem by efficient combined test and optimization method, to obtain fast and efficiently in actual applications reliable and effective test result.
As shown in Figure 2, Fig. 2 is RFID antenna quick deployment method flow chart provided by the invention, uses the system of RFID antenna rapid deployment of the present invention to realize that RFID antenna quick deployment method may further comprise the steps:
Step 201: with door type frame structure 1, frame guide rail groove 2, rfid interrogator 3, Three Degree Of Freedom motor 4, the RFID antenna 5 in the RFID antenna rapid deployment system, and the RFID label 6 of pasting on the commodity is arranged in the test environment, the product type of RFID label 5, rfid interrogator 3 and the RFID antenna 5 of at first determining, then RFID label 6 is pasted on survey fixed position in the commodity packaging, and pile up on means of transportation with common stacking form, at last RFID antenna 5 is fixed to Three Degree Of Freedom motor 4 tops on the type frame structure 1;
Step 202: be each Three Degree Of Freedom selection of Motor Three Degree Of Freedom motor 4 and 2 relative displacements of frame guide rail groove, the initial value scope of vertical angle and level angle, rule of thumb with applied environment in constraint dwindle relative displacement, the initial span of vertical angle and level angle, for example in order to allow RFID label 6 in the main lobe scope of RFID antenna 5, three RFID antenna θ can be controlled at 90 ° ± 30 ° to the angle of rotating, φ is controlled at 25 ° ± 10 ° to the angle of rotation, in addition according to the commodity height of putting on the means of transportation about 50cm, the displacement range of left and right sides RFID antenna 5 can also be controlled at 50cm ± 20cm, the displacement range of top RFID antenna 5 is controlled at 120cm ± 20cm, so just can greatly shorten the first time of test.It is to be noted, may bring a kind of consequence to being compressed with of span, be that optimal location is not in the span after compression, therefore also need in subsequent step (step 208), the reasonability to initial span test, and rely on searching algorithm (step 209) and span is adjusted and expanded, until find the optimal level combination of each variable.
Step 203: determine factor level and the normalized of each Three Degree Of Freedom motor 4 and frame guide rail 2 groove relative displacements, vertical angle and level angle, when carrying out normalized, establish i continuously independent variable z
iSpan be [z
Imin, z
Imax] (i=1,2 ..., m), the mid point that defines this span is
The step value of span is
Do m linear transformation
(i=1,2 ..., m) just can be with continuous independent variable z
iActual span [z
Imin, z
Imax] be converted to new independent variable x
iSpan [a, a], realize normalization.
For example in embodiment as shown in Figure 1, the displacement of three RFID antennas 5 with 10cm as a step value, φ is to rotating with 5 ° as a step value, θ is to rotating with 15 ° as a step value, so just each factor is divided into 5 levels, because the span of all independents variable all is arithmetic progression, therefore can normalize in [2,2] interval.
Step 204: design RFID antenna 5 rapid deployments are tested the quadrature gauge outfit of all parameters, the recognition performance of rfid interrogator 3 under the combination of Three Degree Of Freedom motor 4 different parameters carried out orthogonal test, for example in embodiment as shown in Figure 1, adopt the L of 5 levels, 11 factors, 50 horizontal combination
50(5
11) orthogonal arrage, the factor number that orthogonal arrage can hold is greater than factor number actual in the test, and leave the empty row of two row and be listed as error, be used for the error size of each factor of estimation and carry out significance analysis, design the laggard row orthogonal test of quadrature gauge outfit, utilize the orthogonality principle balanced collocation factor and level, make the test number (TN) of each factor, each level identical, obtain all Changing Patterns of combination with the part representative test like this.
Step 205: utilize least-squares estimation to calculate all parameters with Three Degree Of Freedom motor 4 as independent variable Z, with the recognition performance of rfid interrogator 3 coefficient vector as multiple linear regression equations y=Z β+ε of dependent variable y
Step 206: according to the factor conspicuousness of all independents variable of Variance Analysis Evaluation Three Degree Of Freedom motor 4, simplify multiple linear regression equations, respectively each factor j is carried out the F check, for given level of significance α, if F
j＞F
α(df
j, df
e), think that then factor j has appreciable impact to result of the test, otherwise think that factor j has no significant effect result of the test, then in multiple linear regression equations, omit the item that this factor pair is answered, wherein F
jBe the poor ratio of factor j mean square deviation and error mean square, df
j, df
eRepresent respectively the degree of freedom of factor j and the error degree of freedom of orthogonal test, f
α(df
j, df
e) can check in by the F tables of critical values that distributes.
Step 207: the independent variable coding type of relative displacement, vertical angle and the level angle of each Three Degree Of Freedom motor 4 of substitution and frame guide rail groove 2 obtains y about the multiple linear regression equations of original independent variable.
Step 208: the recognition performance of rfid interrogator 3 under the combination of Three Degree Of Freedom motor 4 different parameters carried out zero level point duplicate test, the degree of fitting of check multiple linear regression equations, for example in embodiment as shown in Figure 1, arrange duplicate test p time for zero level point, can calculate the repeated experiments error according to the result of duplicate test
Step-up error degree of freedom df
E0=p-1, definition is lost and is intended sum of squares of deviations SS
Lf=SS
e-SS
E0, losing and intending the degree of freedom is df
Lf=df
e-df
E0, check this moment
Should obey the degree of freedom and be (df
Lf, df
E0) F distribute, for given level of significance α, if F
Lf＜F
α(df
Lf, df
E0), think that then the mistake plan of multiple linear regression equations is not remarkable, enter step 209, otherwise think to lose and intend significantly returning step 202 and reselecting independent variable initial value scope; Wherein
Be respectively the as a result mean value of result and p the duplicate test of the p time duplicate test, SS
eThe error sum of squares of deviations of orthogonal test, df
e, df
E0Be respectively the error degree of freedom of orthogonal test and the error degree of freedom of zero level point duplicate test, F
LfFor losing the ratio of intending mean square deviation and duplicate test mean square deviation, F
α(df
Lf, df
E0) can try to achieve by inquiry F distribution tables of critical values.
Step 209: the recognition performance of rfid interrogator 3 under the combination of Three Degree Of Freedom motor 4 different parameters carried out the gradient search test, determine the optimal location that RFID antenna 5 is disposed, at first according to the regression equation absolute value
Maximum independent variable is chosen a step value Δ x
j, be other independent variable calculated step value again
I=1 wherein, 2 ..., m, i ≠ j is at point (k Δ x
1, k Δ x
2..., k Δ x
m) locate to arrange to test, the observation test result, until flex point appears in test result, k={0 wherein, 1,2 ..., expression gradient search number of times, as shown in Figure 3, test result obtains maximum when k=3, then according to the step value formula counter push away can obtain each independent variable this time value, with this optimum position of disposing as RFID antenna 5.
Step 210: the optimal position parameters according to RFID antenna 5 is disposed, frame guide rail groove 2 and Three Degree Of Freedom motor 3 are replaced with fixed support, fixed support and RFID antenna 5 is affixed, make the RFID antenna keep position and the angle of optimal deployment.
In embodiment as shown in Figure 1, optimal case for 9 independents variable obtaining three RFID antennas 5, three groups of tests have been carried out altogether, be respectively orthogonal test (50 groups), zero level point duplicate test (5 groups) and gradient search test (6 groups), greatly dwindled the workload of test, carried out fast so that RFID antenna 5 is disposed; Last result of the test (output valves at initial point+3 Δ places) has proved can obtain better to distinguish performance with this position and angle deployment RFID antenna apparently higher than the result of the test of orthogonal test group.The quick deployment method of this RFID antenna is disposed or many allocating antennas for single antenna, even stacked antenna is disposed all effective, adopt this method, can in new environment, dispose fast and efficiently the RFID antenna by assisting user, for the integrity problem that solves in the application deployment provides a kind of feasible solution.
It is for realizing the present invention and embodiment that the above describes, scope of the present invention should not described to limit by this, it should be appreciated by those skilled in the art, in any modification or partial replacement that does not depart from the scope of the present invention, all belong to claim of the present invention and come restricted portion.
Claims (10)
1. RFID antenna rapid deployment system, it is characterized in that: comprise a type frame structure, the frame guide rail groove, rfid interrogator, the Three Degree Of Freedom motor, the RFID antenna, and the RFID label of pasting on the commodity, wherein door type frame structure places site of deployment to be used to dispose the position of rfid interrogator, one or more frame guide rail groove is fixed on the type frame structure, one or more Three Degree Of Freedom motors are installed on the frame guide rail groove, the RFID antenna is bolted in the top of Three Degree Of Freedom motor, the RFID antenna also links to each other by radio frequency cable with rfid interrogator, under the driving of Three Degree Of Freedom motor, realize and the relative displacement of frame guide rail groove, the variation of vertical angle and level angle, the commodity of having pasted the RFID label are positioned on transport vehicle or the conveyer belt according to the characteristics of putting in using, and the route of setting passing-through door type frame structure, during test, the commodity of having pasted the RFID label are deposited on transport vehicle or the conveyer belt through the type frame structure of moving into one's husband's household upon marriage, rfid interrogator is by RFID antenna recognition value RFID label simultaneously, regulate the parameter change RFID antenna of Three Degree Of Freedom motor and the relative displacement of frame guide rail groove, vertical angle and level angle, rfid interrogator compares the recognition performance of Three Degree Of Freedom motor under different parameters, obtain best recognition result, distinguish result as the aid decision foundation of judging RFID antenna optimal deployment position with this best.
2. RFID antenna rapid deployment system according to claim 1, it is characterized in that: the quantity of described frame guide rail groove, Three Degree Of Freedom motor and RFID antenna equates, article one, a Three Degree Of Freedom motor can only be installed on the frame guide rail groove, and a RFID antenna also can only be fixed in a Three Degree Of Freedom motor top.
3. RFID antenna rapid deployment system according to claim 1, it is characterized in that: described many frame guide rail grooves are fixed on the type frame structure, can be to be arranged in parallel, to be arranged above and below, to be staggered, not have any intersection point between any two frame guide rail grooves.
4. RFID antenna rapid deployment system according to claim 1, it is characterized in that: judge that the aid decision of RFID antenna optimal deployment position is according to after obtaining, frame guide rail groove and Three Degree Of Freedom motor are removed from door type frame structure, mounting and fixing bracket on this position, and fixed support and RFID antenna is affixed, make the RFID antenna keep position and the angle of optimal deployment.
5. a right to use requires the RFID antenna quick deployment method of 1 described RFID antenna rapid deployment system, it is characterized in that, may further comprise the steps:
Step 1: with door type frame structure, frame guide rail groove, rfid interrogator, Three Degree Of Freedom motor, RFID antenna, and the RFID label of pasting on the commodity is arranged in the test environment;
Step 2: be the initial value scope of each Three Degree Of Freedom selection of Motor Three Degree Of Freedom motor and the relative displacement of frame guide rail groove, vertical angle and level angle;
Step 3: factor level and the normalized of determining each Three Degree Of Freedom motor and the relative displacement of frame guide rail groove, vertical angle and level angle;
Step 4: design RFID antenna rapid deployment is tested the quadrature gauge outfit of all parameters, and the recognition performance of rfid interrogator under the combination of Three Degree Of Freedom motor different parameters carried out orthogonal test;
Step 5: utilize least-squares estimation to calculate all parameters with the Three Degree Of Freedom motor as independent variable, with the coefficient vector of rfid interrogator recognition performance as the multiple linear regression equations of dependent variable;
Step 6: according to the factor conspicuousness of all independents variable of Variance Analysis Evaluation Three Degree Of Freedom motor, simplify multiple linear regression equations;
Step 7: the independent variable coding type of each Three Degree Of Freedom motor of substitution and the relative displacement of frame guide rail groove, vertical angle and level angle obtains the multiple linear regression equations of original independent variable;
Step 8: the recognition performance of rfid interrogator under the combination of Three Degree Of Freedom motor different parameters carried out zero level point duplicate test, the degree of fitting of check multiple linear regression equations, if by significance test, then enter step 9, then do not return step 2 by significance test;
Step 9: the recognition performance of rfid interrogator under the combination of Three Degree Of Freedom motor different parameters carried out the gradient search test;
Step 10: according to the optimal position parameters of RFID allocating antenna, frame guide rail groove and Three Degree Of Freedom motor are replaced with fixed support.
6. RFID antenna quick deployment method according to claim 5, it is characterized in that: described being arranged in the test environment, at first determine the product type of RFID label, rfid interrogator and RFID antenna, then with the fixed position of RFID label sticking in the survey commodity packaging, and pile up on means of transportation with common stacking form, at last the RFID antenna is fixed on the Three Degree Of Freedom motor on the frame guide rail groove fixing on the type frame structure, and the RFID antenna is linked to each other with rfid interrogator.
7. RFID antenna quick deployment method according to claim 5 is characterized in that: the normalized of described factor level is to establish i continuously independent variable z
iSpan be [z
Imin, z
Imax], i=1,2 ..., m, the mid point that defines this span is
The step value of span is
Do m linear transformation
Just can be with continuous independent variable z
iActual span [z
Imin, z
Imax] be converted to new independent variable x
iSpan [a, a], realize normalization.
8. RFID antenna quick deployment method according to claim 5 is characterized in that: described simplification multiple linear regression equations refers to respectively each factor be carried out the F check, for given level of significance α, if F
j＞F
α(df
j, df
e), think that then factor j has appreciable impact to result of the test, otherwise think that factor j has no significant effect result of the test, then in multiple linear regression equations, omit the item that this factor pair is answered, wherein F
jBe the poor ratio of factor j mean square deviation and error mean square, df
j, df
eRepresent respectively the degree of freedom of factor j and the error degree of freedom of orthogonal test.
9. RFID antenna quick deployment method according to claim 5, it is characterized in that: described zero level point duplicate test, the degree of fitting of check multiple linear regression equations is in p duplicate test of zero level point arrangement, calculates the repeated experiments error according to the result of duplicate test
Error degree of freedom df
E0=p-1, order is lost and is intended sum of squares of deviations SS
Lf=SS
e-SS
E0, losing and intending the degree of freedom is df
Lf=df
e-df
E0, check
Whether obey the degree of freedom and be (df
Lf, df
E0) F distribute y wherein
0i,
Be respectively the as a result mean value of result and p the duplicate test of the p time duplicate test, SS
eThe error sum of squares of deviations of orthogonal test, df
e, df
E0Be respectively the error degree of freedom of orthogonal test and the error degree of freedom of zero level point duplicate test, f
LfFor losing the ratio of intending mean square deviation and duplicate test mean square deviation.
10. RFID antenna quick deployment method according to claim 5 is characterized in that: described gradient search test is according to the regression equation absolute value
Maximum independent variable is chosen a step value Δ x
j, be other independent variable calculated step value again
I ≠ j wherein is at point (k Δ x
1, k Δ x
2..., k Δ x
m) locate to arrange test, the observation test result, until flex point appears in test result, k={0 wherein, 1,2 ..., expression gradient search number of times.
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| CN201010185481XA CN101872885B (en) | 2010-05-28 | 2010-05-28 | Rapid deploying system and method for a RFID (radio frequency identification devices) antenna |
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| CN201010185481XA CN101872885B (en) | 2010-05-28 | 2010-05-28 | Rapid deploying system and method for a RFID (radio frequency identification devices) antenna |
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| CN101872885B true CN101872885B (en) | 2013-01-02 |
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