CN102156893A - Cleaning system and method thereof for data acquired by RFID device under network - Google Patents
Cleaning system and method thereof for data acquired by RFID device under network Download PDFInfo
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Abstract
The invention discloses a cleaning system and a method thereof for data acquired by a RFID (radio frequency identification) device in network environment, which are characterized in that a server administrator inputs customized parameters for operation of a global data cleaning unit through a server end user input management unit, a client data buffering unit obtains the data transmitted by a reader and stores the data in a buffer zone; a local data cleaning unit cleans the data; then, the data is transmitted to a global data buffering unit at the server end through a client and server end communication unit, the global data cleaning unit performs data cleaning to uniformly clean data streams transmitted from the client, wherein the cleaning process comprises cleaning operations of single-path filtering, multi-path correction, multi-path decision and multi-path merging; and after cleaning the data streams, the data is transformed to be necessary for an up-layer application according to the data format of the up-layer application, and the data is transmitted to the up-layer application. The cleaning system and the method thereof have the advantages of supporting distributed environment, adaptive adjustment on cleaning policies, customized user cleaning operation definition and the like.
Description
Technical field
The present invention relates to a kind of use at RFID in to the system and method for RFID data cleansing, technology, method and the realization of more specifically saying so and under distributed RFID device network environment, the RFID data being cleaned.
Background technology
Radio-frequency (RF) identification (Radio Frequency Identification; Be called for short RFID) be a kind of non-contact automatic identification technology.Nineteen seventies is to the 1980s, and U.S. government transfers the RFID technology to civilian on a large scale by Los Alamos research laboratory etc., and in the tracking that is widely used in animal and the management.Since nineteen nineties, the volume of RFID equipment is also more and more littler, and cost is also more and more lower, and the application extension of RFID has arrived numerous areas such as logistics, supply chain, retail trade, food, medicine and communications and transportation.The RFID device network combines with IP network, will realize the Internet of Things of " in kind interconnected " in the whole world.
Because the radio frequency signal that the RFID technology adopts is disturbed by external condition very easily, causes skip in the RFID data acquisition, mutiread is read the dirty data phenomenon and is taken place again and again, has reduced the accuracy during RFID uses.In present middleware product, BizTalk RFID as Microsoft, the RFIDAnywhere 2.1 of Sybase company, the WebSphere RFID Device Infrastructure of IBM, the OracleSensor Edge Server of Oracle company, the WebLogic RFID product of BEA company, and among the middleware Fosstrak that increases income, processing to the data cleaning also rests on simple filtering, and the screening aspect does not reach the degree that satisfies the upper layer application needs.Upper layer application is used the more still significant data relevant with business, and the source of business datum is exactly the most original label data.The data cleansing operational data is cleaned concerning upper layer application even entire RF ID framework is vital, and it is the excessive of physical layer and logic aspect, and data cleansing accurately is mapped to the label of physical environment the label ID of logic aspect.The original tag data exist skip or mutiread and redundancy in the process of obtaining, upper layer application is impossible directly use raw data.Therefore whether the effect of cleaning directly to affect business datum correct, accurate and complete.
At home, because the time ratio that the RFID technology enters is shorter, imperfection is gone back in the work of each side, compares with the world also to have apparent in view gap.In academia, Institute of Automation, CAS has been developed RFID public service system architecture software and blood, food, the retrospective management middleware of medicine, the Central China University of Science and Technology has developed the RFID product Smarti that supports multi communication platform, Shanghai Communications University has developed the data management of commercial presence logistics and integrated RFID platform, the LYNKO-ALE RFID software architecture platform of Dong Fanglige company, the same with external RFID platform, they also only filter at label data, grouping, counting, anti-mispronounce with skip etc., do not have effectively to finish data cleansing work.
Above-mentioned rfid system is being disposed, and in the time of for RFID raw data design cleaning model, will give careful consideration to window size.In fact, environmental quality, configure hardware, middleware, the time and money cost that these 3 factors account for a large amount of in deployment.And, in the whole life of system deployment, outside environment and even system itself, neither one is understood continuously effective.Therefore, data cleansing system must carry out the requirement that repeatedly change just may be satisfied the data cleansing precision at entire RF ID platform run duration.
Summary of the invention
The present invention is in order to overcome defective and the weak point that existing RFID data cleansing technology exists, at the RFID data characteristics, for the original label data of RFID provides adaptive data cleansing software systems and method.Native system is supported distributed network environment, and LAN (Local Area Network) and WLAN (wireless local area network) can be regulated and clean strategy automatically according to the quantity of recognizer reading tag data.
RFID data cleansing system and method for the present invention is on the basis of the RFID network that RFID read-write equipment, the moving target that carries the RFID label and fixed network that Regional Distribution is disposed are constituted, by operating in overall cleaning procedure on the server, operating in the distributed RFID data cleansing scheme of a kind of Master/Worker pattern that local cleaning procedure on the remote client and RFID original data stream thereof formed.
The purging system of image data is characterized in that comprising server end and client under a kind of RFID device network environment;
Described server end comprises:
Server end user input manager unit, the supplemental characteristic when being used to system initialization is provided, i.e. server end: IP, DNS, port, time for reading sheet and the fiducial probability that reads fully;
Server end custom rule processing unit for the single channel that the user provides is filtered, multichannel is proofreaied and correct, multichannel is adjudicated, the cleaning rule definition template of multiway merge, is the required cleaning rule of its customization; The syntax parsing of data cleansing rule is provided, promptly character scanning User Defined cleans the text of rule one by one, resolve wherein reserved word, syntactical unit and association thereof, be each syntactical unit and related corresponding object and the object linking created thereof, finally form the AST tree of text correspondence;
The global data buffer cell is used to cushion the data that a plurality of clients are sent to server end;
The client communication administrative unit is used for communicating by letter of administrative client and server end;
The global data cleaning unit, the data that are used for all are submitted to service end are cleaned according to user-defined cleaning rule, specifically comprise: (1) single channel is filtered: with user-defined time window single data stream is filtered, filter out the data of repetition; (2) multichannel is proofreaied and correct: according to user-defined time window and recognizer group, a plurality of data stream are proofreaied and correct---deletion and the irrelevant data of group, and the multichannel data of more same time point is filled up the data of missing for the skip recognizer; (3) multichannel judgement: according to user-defined time window and recognizer group, the multichannel data of more same time point, according to user's requirement---give a certain recognizer same data decision; (4) multiway merge: according to user-defined time window and recognizer group, on the basis that multichannel is proofreaied and correct, a plurality of data stream are carried out merger, the data after proofreading and correct are merged into the data of this recognizer group;
The upper layer application interface unit is used for the data of the standard format after cleaning are submitted to upper layer application;
Client comprises:
The client dispensing unit, the IP and the port that are used for user customer are configured;
The client data buffer cell is used to cushion the data that the RFID recognizer is sent to client;
Local data's cleaning unit, time window by dynamic adjustment recognizer cleans client data buffer cell data in buffer, be that the time window that recognizer reads will be got caught up in variation, label has moved soon needs short time window, and what label moved is very slow in the big time window of use;
Client and server end communication unit, the RFID data after being used for the local data cleaning unit cleaned send to the global data buffer cell of server end.
Described server end also comprises: the system monitoring unit, be used to provide user's calling function, and make the user can observe the operation conditions of current system at any time.
Data cleansing of the present invention unit can be finely tuned according to the operation conditions of system self.In the life cycle of entire RF ID platform, purging system does not need artificial interference, can adaptively adjust.Cleaning unit self carries out data modeling according to current data, analyzes by probability model, adjusts the parameters of cleaning in the strategy, has comprised the moving window size, the timeslice cell size of data processing, the data confidence level size of permission etc.Data merge cells of the present invention carries out standard with the data in a plurality of different pieces of informations source, and is stored into the system buffer.
The method that a kind of purging system that adopts image data under the above-mentioned RFID device network environment cleans the data of RFID equipment collection is characterized in that
1) program to server end is configured, and has comprised the server end communication parameter configuration, and buffer size connects number clients;
2) start server end, comprised the initialization that starts buffer zone, the startup of management receives the startup of external command;
3) server administrators are by server end user input manager unit, the customized parameter of input global data cleaning unit operation, be the IP of server end, DNS, port, time for reading sheet and the fiducial probability that reads fully, comprised parsing to rule, user-defined cleaning operation is defined, filter from the single channel that provides, multichannel is proofreaied and correct, the multichannel judgement, multiway merge cleans in the template and selects one, set concrete parameter, system generates the cleaning rule that is customized for it, after input was finished, system start-up global data cleaning unit started the client communication module;
4) server end starts end, and the global data cleaning unit is waited for, sends first data of cleaning up to client;
5) client is configured, has comprised the configuration of IP and the port of messaging parameter, start client and server end communication unit, it is smooth and easy whether test can communicate by letter with server end, if communicate by letter successfully, then carry out next step, if the unsuccessful administrator error that then returns to is pointed out;
6) clock of uniform server end and client starts the client data buffer cell, starts physics recognizer and local data cleansing unit;
7) the client data buffer cell gets access to the data that recognizer sends over, and it is stored in buffer zone; Notify local data's cleaning unit to carry out cleaning this moment;
When 8) local data's cleaning unit of client receives the message informing of buffer zone, take out the current data that read from buffer zone, client is improved the quality that data successfully read by dynamically adjusting the size of the time window of recognizer;
9) client sends to server end with preliminary wash result by client and server end communication unit, the global data buffer cell of server end receives the data that send to, the global data cleaning unit of storage and announcement server end can carry out data cleansing work;
10) the global data cleaning unit receives notification message, and startup is cleaned machine-processed, according to user-defined rule, to unified cleaning of data stream that client is sent, comprises that single channel filtration, multichannel are proofreaied and correct, multichannel is adjudicated, the cleaning operation of multiway merge;
11) after the cleaning,, according to the data layout of upper layer application, be converted to the data that upper layer application needs, and send in the past all cleaning data.
The cleaning method of local data's cleaning unit is as follows: take out the current data that read from buffer zone, client is by dynamically adjusting the size of the time window of recognizer, improve quality family portion of end office (EO) data cleansing unit that data successfully read successful reading times according to each label i on continuous several time for reading sheets, for each label i calculate respectively separately on average read probability P
i, according to the maximal value P that on average reads probability
MaxThe fiducial probability λ that reads fully calculates new time window w, makes w=ln (1 ÷ (1-λ)) ÷ P
MaxW compares with the current time window, if w greatly just enlarges the current time window, if the little current time window that just dwindles of w.
The client run duration, system can regularly adjust the clock of client according to the time of server end, and the clocking error that makes the client and server end is in 10ms.Server, the client run duration provides outside interface, allows the personnel with certain authority that system is monitored.
The present invention has following beneficial effect:
1) supports distributed environment.The present invention can and carry out the RFID data cleansing in the distributed environment (LAN (Local Area Network) and wide area network) really in the distributed environment (as: VMware) of simulation.Distributed data cleaning method of the present invention only needs less user bandwidth, and the deployment of client computer also is very flexible and changeable, greatly reduces the requirement to equipment.
2) adaptive cleaning strategy is adjusted.The data cleansing system need not change at RFID platform run duration, the model of system by setting up, at the raw data that gets access in the real time execution, analytical calculation goes out the size that self-adaptation is regulated parameter, change current cleaning strategy, make it to meet the data of next time quantum of model prediction.
3) self-defining user's cleaning operation definition.The user can submit to system with self-defining data cleansing operation, and system, is included in these self-defining operation wherein in the time of the data cleansing cell operation at user's self-defining operation.
Description of drawings
Fig. 1 is the structural representation that the present invention is used for RFID data cleansing system;
Fig. 2 is the workflow diagram that the present invention is used for RFID data cleansing system;
Fig. 3 is the device for carrying out said process flow diagram that the present invention is used for RFID data cleansing system.
Embodiment
The invention provides a kind of implementation system that is used for the RFID data cleansing of distributed environment.On physical arrangement, this system can be divided into 4 parts: background server, client computer (operation local data cleaning unit), recognizer (obtaining original RFID data) and label (raw data).Can pass through connections such as serial cable, RJ45 network interface, bluetooth, USB interface or com interface between main frame and the client computer, also can adopt multiple connected mode between client computer and the recognizer, most common form is to connect by com interface or wired netting twine, then is to carry out information interaction by radio frequency signal between recognizer and the label.Background host computer is responsible for the client computer of a plurality of connections is managed and monitors, and carries out the global data cleaning, the cleaning of client computer operation local data.The main frame client computer communicates by Socket agreement and client computer.
Fig. 1 has provided structural representation of the present invention, comprise: server end user input manager unit 101, supplemental characteristic when being used to system initialization is provided, be server end: IP, DNS, port, time for reading sheet (millisecond) and the fiducial probability that reads fully, form by ReceiveExpression, CommandParser, CommandExec class; Server end custom rule processing unit 102 for the single channel that the user provides is filtered, multichannel is proofreaied and correct, multichannel is adjudicated, the cleaning rule definition template of multiway merge, is the required cleaning rule of its customization; The syntax parsing of data cleansing rule is provided, promptly character scanning User Defined cleans the text of rule one by one, resolve wherein reserved word, syntactical unit and association thereof, be each syntactical unit and related corresponding object and the object linking created thereof, finally form the AST tree of text correspondence; By CleanAggregateRulesVisitor, Node, Rules, ParseException, SimpleCharStream, SimpleNode, Token, classes such as TokenMgrError are formed; Global data buffer cell 103 is used to cushion the data that a plurality of clients are sent to server end, prevents that data volume is excessive, and the data cleansing system can't effectively work, and causes loss of data, and by Cache, the CacheManager class is formed; Client dispensing unit 104, the IP and the port that are used for user customer are configured; Client data buffer cell 105 is used to cushion the data that the RFID recognizer is sent to client, prevents loss of data, improves the throughput efficiency of purging system, and by Cache, the CacheManager class is formed; Local data's cleaning unit 106, time window by dynamic adjustment recognizer cleans client data buffer cell data in buffer, be that the time window that recognizer reads will be got caught up in variation, label has moved soon needs short time window, and what label moved is very slow in the big time window of use; (specifically according to the successful reading times of each label on continuous several time for reading sheets, for each label calculate respectively separately on average read probability, calculate new time window according to maximal value that on average reads probability and the fiducial probability that reads fully, adjust the time window of recognizer in real time), by ScheduledThread, CompeteParameters, Comuser, Model, CompeteWindow, classes such as Dynamic are formed; Client and server end communication unit 107, the RFID data after being used for the local data cleaning unit cleaned send to the global data buffer cell of server end, are used to finish communicating by letter of client and server end, preliminary wash result is sent to server end, comprise Request, Response, NotifyExec, NotifySimpleExec, SendMessage, ParserMessage, Service, MessageListener, MessageService etc.; Client communication administrative unit 108 is used for communicating by letter of administrative client and server end, comprises operations such as closing of client,, by Manage Client, Request, Response, NotifyExec, NotifySimpleExec, SendMessage, ParserMessage, Service, MessageListener, classes such as MessageService are formed; Global data cleaning unit 109, the data that are used for all are submitted to service end are cleaned according to user-defined cleaning rule, specifically comprise: (1) single channel is filtered: with user-defined time window single data stream is filtered, filter out the data of repetition; (2) multichannel is proofreaied and correct: according to user-defined time window and recognizer group, a plurality of data stream are proofreaied and correct---deletion and the irrelevant data of group, and the multichannel data of more same time point is filled up the data of missing for the skip recognizer; (3) multichannel judgement: according to user-defined time window and recognizer group, the multichannel data of more same time point---as " who reads to such an extent that whom awards more "---is given a certain recognizer same data decision according to user's requirement; (4) multiway merge: according to user-defined time window and recognizer group, on the basis that multichannel is proofreaied and correct, a plurality of data stream are carried out merger, data after proofreading and correct are merged into the data of this recognizer group, comprise class ArbitrationTags, ScheduledThread, CompeteParameters, Comuser, Model, CompeteWindow, Dynamic etc.; System monitoring unit 110 is used to provide user's calling function, makes the user can observe the operation conditions of current system at any time, has comprised ExportInterface, ExportLog, ExportStatus, external call function classes such as ExportInformation; Upper layer application interface unit 111 is used for the data of the standard format after cleaning are submitted to upper layer application; And the needed data layout of definition upper layer application, data layout by the user definition upper layer application, data layout after cleaning is turned to the data of specified format: (the label ID of the standard data format after the cleaning, the recognizer numbering, enter the recognizer time, leave the recognizer time, because the conversion of data layout is unusual proven technique, and specifically convert to which type of use form neither inventive point of the present invention, therefore do not do too much explanation herein), comprised DataFormat, crucial class such as SendMessagetToUppers.
Wherein the cleaning method of local data's cleaning unit 106 is as follows: take out the current data that read from buffer zone, client is by dynamically adjusting the size of the time window of recognizer, improve quality family portion of end office (EO) data cleansing unit that data successfully read successful reading times according to each label i on continuous several time for reading sheets, for each label i calculate respectively separately on average read probability P
i, according to the maximal value P that on average reads probability
MaxThe fiducial probability λ that reads fully calculates new time window w, makes w=ln (1 ÷ (1-λ)) ÷ P
MaxW compares with the current time window, if w greatly just enlarges the current time window, if the little current time window that just dwindles of w has reached the function that local data is cleaned.
Illustrate that in conjunction with Fig. 2 the present invention is used for the workflow of RFID data cleansing system.
1) program to server end is configured, and has comprised server end communication parameter configuration (IP, DNS, port), and buffer size connects number clients, (step S201);
2) after the system start-up, receive user's input, start basic module, (step S202);
3) server administrators are by server end user input manager unit 101, the customized parameter of input global data cleaning unit 109 operations, be the IP of server end, DNS, port, time for reading sheet (millisecond) and the fiducial probability that reads fully, comprised parsing to rule, user-defined cleaning operation is defined, filter from the single channel that provides, multichannel is proofreaied and correct, the multichannel judgement, multiway merge cleans in the template and selects one, set concrete parameter, system generates the cleaning rule that is customized for it, after input is finished, system start-up global data cleaning unit 109, start client communication module server end and start, server end starts and finishes, and global data cleaning unit 109 is waited for (step S203);
4) client is configured, has comprised the configuration of IP and the port of messaging parameter, (step S204);
5) start client and server end communication unit 107, it is smooth and easy whether test can communicate by letter with server end, if communicate by letter successfully, then carries out next step, if unsuccessful administrator error prompting, (the step S205) of then returning to;
6) clock of uniform server end and client, error start client data buffer cell 105 in 10ms, start physics recognizer and local data cleansing unit 106, (step S206);
7) client data buffer cell 105 gets access to the data that recognizer sends over, and it is stored in buffer zone; Notify local data's cleaning unit to carry out cleaning this moment, (step S207);
When 8) local data's cleaning unit 106 of client receives the message informing of buffer zone, from buffer zone, take out the current data that read, (step S208);
9) local data's cleaning unit 106 work, client is improved the quality that data successfully read by dynamically adjusting the size of the time window of recognizer; , the effect of recognizer time window is analogous to takes pictures---and window is equivalent to greatly clap slowly, and window is equivalent to clap soon for a short time.Daily experience is to take pictures to such an extent that can catch the instantaneous variation of scenery (to be equivalent to wicket soon, can avoid skip, repeat to read), scenery does not just change for a long time and can slowly clap, and promptly reduces the speed of row's photograph and frequency and does not lose variation (be equivalent to big window, not can skip) yet.So the suitable purpose that just can reach data cleansing of time window, (step S209);
10) client sends to server end with preliminary wash result by client and server end communication unit 107, (step S210);
11) the global data buffer cell 103 of server end receives the data that send to, and the global data cleaning unit 109 of storage and announcement server end can carry out data cleansing work, (step S211);
12) global data cleaning unit 109 receives notification message, start the mechanism of cleaning,, the data stream unification that client is sent is cleaned according to user-defined rule, comprise that single channel is filtered, multichannel is proofreaied and correct, multichannel is adjudicated, the cleaning operation of multiway merge, (step S212);
13) after the cleaning, with all cleaning data,, be converted to the data that upper layer application needs, and send the past (step S213) according to the data layout of upper layer application;
In addition, at server, the client run duration provides outside interface, allows the personnel with certain authority that system is monitored, also allows to revise the parameter of part simultaneously.
Fig. 3 has provided the process flow diagram of the invention process device.This device can be divided into client, server end and dissimilar recognizer three parts on main body, wherein server end moves global data cleaning unit program, client computer operation local data cleaning unit program, be connected on the same LAN (Local Area Network) by netting twine between the two, adopt ICP/IP protocol or http protocol to carry out communication.Adopt COM serial port or network interface etc. to carry out communication between client and the recognizer, recognizer obtains label data by radio frequency signal, and by being sent to client computer, the preliminary cleaning of client computer sends data to server end afterwards then.
Express for convenience, Rule of judgment among Fig. 3 is all write a Chinese character in simplified form into identifier, wherein X1 represents " client with server end whether communicate by letter success ", and X2 represents " whether the client buffer district has the RFID data ", and X3 represents " whether the server end buffer zone has the RFID data ".As shown in Figure 3, the concrete steps of apparatus of the present invention are:
1) configuration server end program starts server, resolves User Defined global data cleaning unit rule, starts the global data cleaning unit, and after global buffer started, client did not send data, and server is waited for;
2) the configuration client-side program starts the client communication module, and communication protocol can be selected TCP/IP, also can select http protocol, tests this client whether communicate by letter successfully with server end (the represented meaning of value that is X1).If X1=F, the expression communication failure points out the user to make mistakes simultaneously; If X1=T, expression is communicated by letter successfully, continues next step;
3) after communicating by letter successfully, start buffer zone, start recognizer and local data cleansing unit;
4) program judges whether buffer zone has data (being the represented meaning of value of X2).If X2=F, expression RFID recognizer no datat, local data's cleaning unit postpones to wait for; If X2=T, buffer zone notice local data cleaning unit, the data that cleaning unit is treated in the processing time sheet are cleaned, and according to the model that system sets up, calculate the strategy of data cleansing next time;
5) data that local data's cleaning unit is handled send to server end, and data storage is in the buffer zone of server end.When the data in the buffer zone were sky, the value of X3 was F, and expression global data washer postpones to wait for; Local washer sends data to global buffer and the value of X3 can be changed into T, and buffer zone notifies overall washer to start working.
6) data after the global data washer will clean send to upper layer application.
[first embodiment]
First preferred embodiment of the present invention is to be example with warehouse, the supermarket commodity warehouse-in that is equipped with rfid system.The commodity of warehouse-in all post the RFID label.Because ID number of label all is unique, therefore conflict can not appear, and promptly commodity and label are the relations of shining upon one by one.Suppose that the warehouse has inlet A, B number, has installed recognizer R1, R2 respectively.Dispose 2 client-side program ClientA, ClientB simultaneously, managed R1, R2 recognizer respectively.Suppose that have commodity 1,2,3 (to carry label id1 respectively this moment, id2, id3) wait to put in storage, commodity 1,2 enter the warehouse by A, commodity 3 enter the warehouse by B, in entering the warehouse process, recognizer constantly with label generation electromagnetic action, each label ID will constantly be read by recognizer, therefore exists a large amount of redundant informations; Because the distance of inlet A, B is less than the read range of recognizer R1, R2, therefore the recognition scope that R1, R2 overlap may produce conflicting data.Present embodiment is just filtered with single channel and the multichannel judgement is that example is introduced the global data cleaning and how to be carried out work.
According to RFID data cleansing method of the present invention, it is as follows that it detects step:
1) after server and client-side program ClientA, ClientB start successfully according to system requirements.Enter commodity and begin to put in storage flow process, label is through A, B inlet, the continual reading tag data of recognizer, and the label data that reads is sent to the buffer zone of client, client buffer district notice local data cleaning unit work this moment, time window carries out preliminary filtration to label data.
2) ClientA local data cleaning unit is according to the official hour sheet processing unit EPOCH1 of system (0.25 second), gets data in the EPOCH1 from buffer zone, falls the mutiread data by sliding window filter then.
Suppose that in EPOCH1 real data are to be id1 ID number, the label of id2, the multidata before local data's cleaning unit is handled is id1 reading 10 times, id2 reading 10 times.The id1 reading is 4 times after the local cleaning of process, id2 reading 4 times.
3) local data's cleaning unit is cleaned strategy according to the time window adaptive model of system design next time, feeds back to system, regulates next time window size.
4) local data's cleaning unit sends to server end with preliminary wash result.The buffer stores data of server end, it begins cleaning with the global data cleaning unit of announcement server end.The global data cleaning unit cleans rule according to custom data, and the data in the server buffers district are cleaned.This enforcement use-case filters according to single channel and the multichannel judgement is cleaned global data.
We suppose that the data layout after the cleaning is exactly a label ID sequence in the present embodiment.So user-defined single channel filtering rule can only be considered TagID (being label ID), rule specifically is defined as:
SELECT?distinct?TagID
FROM S1
RANGE?BY′5?sec′
This rule predetermining will filter out the mutiread data of label timestamp in 5 seconds among the data stream S1.
Suppose that the data stream S1 that client ClientA sends to server end is id1, id1, id2, id2, id1, id2, id1, id2 (being id1 and id2 each 4 times); The data stream S2 that ClientB sends to server end is id1, id3, id3, id1, id3, id3 (being id1:2 time, id3:4 time).After filtering through single channel, the data stream after repeating data in 5 seconds cleaned is that S1 is id1, id2, and id1, id2, S2 are id1, id3, id3.
Filtration is cleaned after the rule through single channel, carries out the multichannel judgement again, and its rule definition is as follows:
Rule decision data stream S1, if colliding data is arranged among the S2, computational data stream S1, the number of times that in data stream, occurs of S2 colliding data, whom who awards more.Through the multichannel judgement, S1 is id1, id2, and calculating S2 equally is id3.
5) server end global data cleaning unit sends to upper layer application with wash result.
6) user can monitor client and service end system in any incident of system's operation, understands system running state etc.
[second embodiment]
Second preferred embodiment of the present invention be with the RFID technology serve as the basis pupil is carried out safety management.Reality scene has comprised student's identification, turnover school gate event detection, current location, activity situation etc.Each is equipped with the identification card of a band RFID label school personnel (comprising student, teacher, teaching and administrative staff, temporary staff), each label indicate identity legal the school personnel.Suppose that going into the student that the school goes to school is background, the system deployment situation is: the school gate entrance guard is equipped with recognizer R1, R2.R1 is apart from 3 meters of school gates, and R2 is apart from 6 meters of school gates, and the function that R1 and R2 will realize is distinguished to some extent, suppose into the school incident be AND (ReadingByR1, ReadingByR2), the incident of leaving school then for AND (ReadingByR2, ReadingByR1).The fact of recognizer recognition distance is 5 meters, and this moment, R1 had overlappingly with the reading range of R2 so, supposed that the setting of recognizer time window is improper, had very big probability to produce a large amount of mutiread data.
Suppose that 10 people that carry label go into the school together, what have walks alone, and has in twos and threes; What have stops, the row that has; What have is fast, and what have is slow.According to the cleaning method that single channel of the present invention is filtered and multichannel is proofreaied and correct, its data cleansing step is as follows:
1) after client-side program ClientA, ClientB (managing recognizer R1 and R2 respectively) and server start successfully according to system requirements.When 10 personnel entered school gate simultaneously, label entered in the recognizer electromagnetic field, the uninterrupted reading tag data of recognizer, 10 personnel's ID is read to be cached to the buffer zone of ClientA, along with the recognition scope that personnel enter R2, personnel ID is also read by R2, and is cached to the buffer zone of ClientB.So all there are redundancy in ClientA, ClientB data in buffer, suppose that the data of buffering all are＜ID
i, R
j, T
jForm, the data of ClientA are DataA={＜ID
1, R
1, T
1,＜ID
2, R
1, T
1,＜ID
3, R
1, T
1,＜ID
4, R
1, T
1,＜ID
5, R
1, T
1,＜ID
6, R
1, T
1,＜ID
7, R
1, T
1,＜ID
8, R
1, T
2,＜ID
1,?, T
2,＜ID
5, R
1, T
2, the data of ClientB are DataB={＜ID
1, R
2, T
5,＜ID
3, R
2, T
5,＜ID
4, R
2, T
5,＜ID
5, R
2, T
5,＜ID
6, R
2, T
5,＜ID
7, R
2, T
5,＜ID
8, R
2, T
6,＜ID
9, R
2, T
7,＜ID
2, R
2, T
7,＜ID
10, R
2, T
7.Because student ID
9And ID
10Walk fast, perhaps blocked electromagnetic signal by the people and disturbed, the label that he carries is not detected by R1, but by R2 in time T
7Detected.
2) local data's cleaning unit sends data to service end, and the global data cleaning unit cleans the data of being obtained respectively according to filtering for the single channel of ClientA and ClientB customization.Single channel with ClientA is filtered into example, rule is: SELECT distinct*FROM rfid_inputDataA RANGE BY 3sec WHERE DataA.reader_id=R1, the global data cleaning unit falls the data ID that (3sec) repeats in 3 seconds according to redundant rule elimination
1And ID
5, the data after cleaning are DataA1={＜ID
1, R
1, T
1,＜ID
2, R
1, T
1,＜ID
3, R
1, T
1,＜ID
4, R
1, T
1,＜ID
5, R
1, T
1,＜ID
6, R
1, T
1,＜ID
7, R
1, T
1,＜ID
8, R
1, T
2.Same reason, the data after ClientB cleans are DataB1={＜ID
1, R
2, T
5,＜ID
3, R
2, T
5,＜ID
4, R
2, T
5,＜ID
5, R
2, T
5,＜ID
6, R
2, T
5,＜ID
7, R
2, T
5,＜ID
8, R
2, T
6,＜ID
9, R
2, T
7,＜ID
10, R
2, T
7.
3) then, according to multichannel correction rule " FOR EACH VALUE v IN (SELECT*FROM DataB1 WHERE DataB1.tag_id NOT IN DataA1) for ClientB customized; INSERT (v.tag_id, R1, T
3) INTO DataA1; END FOR ", the global data cleaning unit continues DataA1 is proofreaied and correct.Promptly,, just it is inserted among the DataA1 (as T if it (is not promptly read by R1) not in DataA1 for each label among the DataB1 (being the label that R2 reads)
3The data that moment R1 reads).Owing to exist and not detected and by the detected label ID of R2 by R1
9And ID
10So the global data cleaning unit can be ID
9And ID
10Label data be inserted in the data of ClientA i.e. DataA2={＜ID
1, R
1, T
1,＜ID
2, R
1, T
1,＜ID
3, R
1, T
1,＜ID
4, R
1, T
1,＜ID
5, R
1, T
1,＜ID
6, R
1, T
1,＜ID
7, R
1, T
1,＜ID
8, R
1, T
2,＜ID
9, R
1, T
3,＜ID
10, R
1, T
3.
4) last server end global data cleaning unit sends to upper layer application with wash result.
Use method provided by the present invention, the user only need understand RFID data cleansing method, just can dispose one fast and be enclosed within the data cleansing method of moving under the distributed environment, native system uses the Java language exploitation to realize, may operate in the common operating system, therefore, the formed system of the present invention have dispose flexibly, dependable performance, the advantage that operational efficiency is high.
To sum up, embodiments of the invention are illustrated.But the present invention is not limited to the scope that the foregoing description is recorded and narrated; anyly be familiar with those skilled in the art in the disclosed technical scope of the present invention; be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, all should be encompassed within protection scope of the present invention.
Claims (6)
1. the purging system of image data under the RFID device network environment is characterized in that comprising server end and client;
Described server end comprises:
Server end user input manager unit, the supplemental characteristic when being used to system initialization is provided, i.e. server end: IP, DNS, port, time for reading sheet and the fiducial probability that reads fully;
Server end custom rule processing unit for the single channel that the user provides is filtered, multichannel is proofreaied and correct, multichannel is adjudicated, the cleaning rule definition template of multiway merge, is the required cleaning rule of its customization; The syntax parsing of data cleansing rule is provided, promptly character scanning User Defined cleans the text of rule one by one, resolve wherein reserved word, syntactical unit and association thereof, be each syntactical unit and related corresponding object and the object linking created thereof, finally form the AST tree of text correspondence;
The global data buffer cell is used to cushion the data that a plurality of clients are sent to server end;
The client communication administrative unit is used for communicating by letter of administrative client and server end;
The global data cleaning unit, the data that are used for all are submitted to service end are cleaned according to user-defined cleaning rule, specifically comprise: (1) single channel is filtered: with user-defined time window single data stream is filtered, filter out the data of repetition; (2) multichannel is proofreaied and correct: according to user-defined time window and recognizer group, a plurality of data stream are proofreaied and correct---deletion and the irrelevant data of group, and the multichannel data of more same time point is filled up the data of missing for the skip recognizer; (3) multichannel judgement: according to user-defined time window and recognizer group, the multichannel data of more same time point, according to user's requirement---give a certain recognizer same data decision; (4) multiway merge: according to user-defined time window and recognizer group, on the basis that multichannel is proofreaied and correct, a plurality of data stream are carried out merger, the data after proofreading and correct are merged into the data of this recognizer group;
The upper layer application interface unit is used for the data of the standard format after cleaning are submitted to upper layer application;
Client comprises:
The client dispensing unit, the IP and the port that are used for user customer are configured;
The client data buffer cell is used to cushion the data that the RFID recognizer is sent to client;
Local data's cleaning unit, time window by dynamic adjustment recognizer cleans client data buffer cell data in buffer, be that the time window that recognizer reads will be got caught up in variation, label has moved soon needs short time window, and what label moved is very slow in the big time window of use;
Client and server end communication unit, the RFID data after being used for the local data cleaning unit cleaned send to the global data buffer cell of server end.
2. the purging system of image data under a kind of RFID device network environment according to claim 1, it is characterized in that described server end also comprises: the system monitoring unit, be used to provide user's calling function, make the user can observe the operation conditions of current system at any time.
3. the method that the purging system that adopts image data under the described RFID device network of claim 1 environment cleans the data of RFID equipment collection is characterized in that
1) program to server end is configured, and has comprised the server end communication parameter configuration, and buffer size connects number clients;
2) start server end, comprised the initialization that starts buffer zone, the startup of management receives the startup of external command;
3) server administrators are by server end user input manager unit, the customized parameter of input global data cleaning unit operation, be the IP of server end, DNS, port, time for reading sheet and the fiducial probability that reads fully, comprised parsing to rule, user-defined cleaning operation is defined, filter from the single channel that provides, multichannel is proofreaied and correct, the multichannel judgement, multiway merge cleans in the template and selects one, set concrete parameter, system generates the cleaning rule that is customized for it, after input was finished, system start-up global data cleaning unit started the client communication module;
4) server end starts end, and the global data cleaning unit is waited for, sends first data of cleaning up to client;
5) client is configured, has comprised the configuration of IP and the port of messaging parameter, start client and server end communication unit, it is smooth and easy whether test can communicate by letter with server end, if communicate by letter successfully, then carry out next step, if the unsuccessful administrator error that then returns to is pointed out;
6) clock of uniform server end and client starts the client data buffer cell, starts physics recognizer and local data cleansing unit;
7) the client data buffer cell gets access to the data that recognizer sends over, and it is stored in buffer zone; Notify local data's cleaning unit to carry out cleaning this moment;
When 8) local data's cleaning unit of client receives the message informing of buffer zone, take out the current data that read from buffer zone, client is improved the quality that data successfully read by dynamically adjusting the size of the time window of recognizer;
9) client sends to server end with preliminary wash result by client and server end communication unit, the global data buffer cell of server end receives the data that send to, the global data cleaning unit of storage and announcement server end can carry out data cleansing work;
10) the global data cleaning unit receives notification message, and startup is cleaned machine-processed, according to user-defined rule, to unified cleaning of data stream that client is sent, comprises that single channel filtration, multichannel are proofreaied and correct, multichannel is adjudicated, the cleaning operation of multiway merge;
11) after the cleaning,, according to the data layout of upper layer application, be converted to the data that upper layer application needs, and send in the past all cleaning data.
4. method according to claim 3, the cleaning method that it is characterized in that local data's cleaning unit is as follows: take out the current data that read from buffer zone, client is by dynamically adjusting the size of the time window of recognizer, improve quality family portion of end office (EO) data cleansing unit that data successfully read successful reading times according to each label i on continuous several time for reading sheets, for each label i calculate respectively separately on average read probability P
i, according to the maximal value P that on average reads probability
MaxThe fiducial probability λ that reads fully calculates new time window w, makes w=In (1 ÷ (1-λ)) ÷ P
MaxW compares with the current time window, if w greatly just enlarges the current time window, if the little current time window that just dwindles of w.
5. method according to claim 3 is characterized in that the client run duration, and system can regularly adjust the clock of client according to the time of server end, and the clocking error that makes the client and server end is in 10ms.
6. method according to claim 3 is characterized in that at server, and the client run duration provides outside interface, allows the personnel with certain authority that system is monitored.
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