CN111191748B - Mobile inventory system based on RFID technology - Google Patents
Mobile inventory system based on RFID technology Download PDFInfo
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- CN111191748B CN111191748B CN201911231438.XA CN201911231438A CN111191748B CN 111191748 B CN111191748 B CN 111191748B CN 201911231438 A CN201911231438 A CN 201911231438A CN 111191748 B CN111191748 B CN 111191748B
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- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
- G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisions for transferring data to distant stations, e.g. from a sensing device
- G06K17/0029—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisions for transferring data to distant stations, e.g. from a sensing device the arrangement being specially adapted for wireless interrogation of grouped or bundled articles tagged with wireless record carriers
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Abstract
The invention discloses a mobile inventory system based on an RFID technology, which comprises a mobile platform, a statistics and arrangement module, a data processing module and RFID scanning equipment, wherein the mobile platform is used for storing information of a plurality of RFID data; acquiring source segment data through RFID scanning equipment; positioning each storage unit through a mobile platform; the method comprises the steps that a plurality of groups of data of RFID tags are subjected to statistics arrangement through a statistics arrangement module, and statistics information of each RFID tag is obtained; the statistical information is weighted through a data processing module, and the article corresponding to the RFID tag is positioned in a storage unit with highest calculation score; searching for lost articles by the data processing module in comparison with the database; ordering all the articles in the storage unit; and finally, comparing the databases to find out the article placed in error. The problem of low inventory accuracy existing in the prior art when the phase signal is utilized for positioning is effectively solved, and the method is applicable to high-frequency and ultrahigh-frequency RFID technology and wide in application range.
Description
Technical Field
The invention relates to the technical field of inventory, in particular to a mobile inventory system based on an RFID technology.
Background
With the rapid development of informatization construction, the inventory demands of people in aspects of warehouse logistics, library archives and data halls and the like are increasingly developed towards the demands of controllable, fine and safe management, and how to adopt advanced and mature scientific and technical means on the basis of the existing management means to safely, effectively and accurately realize inventory management becomes an important research subject.
Radio frequency identification (RFID, radio Frequency Identification) is a non-contact automatic identification technology, which obtains tag data and identifies articles by wireless signals, and is mainly divided into two technologies of high frequency and ultra-high frequency. The RFID technology has the advantages of high identification speed, large data storage capacity, high safety and the like, and is widely applied to inventory positioning management of stored articles in the industries of warehouse logistics, books, archives and the like. In the RFID-based inventory management, an inventory mode that maintenance personnel hold an RFID reader is used conventionally, but the inventory mode has the defects of high inventory working strength, long time consumption and easy error.
With the popularization of mobile robot technology in recent years, a scheme of automatically checking and positioning stored articles by combining RFID technology and mobile robot technology has emerged. However, since the positioning accuracy of the RFID technology on the tag is related to the power and the distance, the tag of other storage units is easily read by the power more, so that the positioning is inaccurate, and if the power is too small or the distance is far, the tag is missed to be read due to the too weak signal, so that the accurate inventory positioning of the stored article is difficult to realize. At present, although a method for performing curve fitting on a tag by utilizing the radio frequency phase of the tag based on a high-power ultrahigh frequency RFID reader can be used for screening and positioning the tag, the inventory positioning method by utilizing the phase signal is more suitable for an ultrahigh frequency technology with more obvious phase signal change; in the scene of being easy to reflect the RFID signal, the inventory positioning error is easy to be caused by the phase signal error; in the inventory of densely stored articles, the fitting distortion of a subsequent positioning related curve is easily caused by a sparse sample set, so that the inventory precision of the stored articles is reduced. Therefore, the current inventory positioning method is not suitable for most inventory application scenes.
Disclosure of Invention
Aiming at the defects, the technical problem solved by the invention is to provide a mobile inventory system based on an RFID technology, which comprises a mobile platform, a statistics arrangement module, a data processing module and RFID scanning equipment; acquiring source segment data through RFID scanning equipment; positioning each storage unit through a mobile platform; the method comprises the steps that a plurality of groups of data of RFID tags are subjected to statistics arrangement through a statistics arrangement module, and statistics information of each RFID tag is obtained; the statistical information is weighted through a data processing module, and the article corresponding to the RFID tag is positioned in a storage unit with highest calculation score; searching for lost articles by the data processing module in comparison with the database; ordering all the articles in the storage unit; and finally, comparing the databases to find out the article placed in error. The method reduces the missing reading rate, eliminates the multi-reading objects, ensures the counting precision, effectively solves the problem of low counting precision when the phase signal is utilized for positioning in the prior art, is suitable for high-frequency and ultrahigh-frequency RFID technology, and has wide application range.
The invention aims at realizing the following technical scheme:
the mobile inventory system based on the RFID technology comprises a mobile platform, a statistics and arrangement module, a data processing module and RFID scanning equipment;
The mobile platform is used for carrying an RFID scanning device to scan RFID labels attached to each article in a storage device, wherein the storage device comprises K storage units, and K is a positive integer; the RFID source segment data processing unit is also used for positioning each storage unit and obtaining the RFID source segment data in the storage unit;
Wherein: the source segment data includes a mapping of the storage unit information StoreUnit and each set of RFID tag data rssiInfo collected in the storage unit: < StoreUnit, rssiInfo set >, the RFID tag data rssiInfo includes an electronic tag ID number, a signal strength value RSSI when the RFID tag signal is detected, a Distance of an antenna from the RFID tag when the RFID tag signal is detected; multiple sets of data may be collected for each RFID tag;
The statistic arrangement module is used for carrying out statistic arrangement on a plurality of groups of data of the RFID tags in the source section data of each storage unit to obtain statistic information of each RFID tag in the source section data, wherein the statistic information at least comprises one of MaxRSSI, averageReciprocalSum, positionRssi, positionPhase; the statistical information is also used for sending the statistical information to a data processing module;
Wherein:
MaxRSSI is the maximum RSSI value in the same RFID tag data;
averageReciprocalSum is the average value of the sum of the reciprocal distances between the antenna and the RFID tag;
positionRssi is the RSSI value corresponding to the peak, namely the highest point, of the curve obtained by performing distance-RSSI quadratic curve fitting on the RSSI value in the same RFID tag information in the storage unit; distance is the motion distance of the RFID antenna fed back by the mobile platform;
positionPhase is a Phase value corresponding to the peak, which is the highest point, of a curve obtained by performing distance-Phase quadratic curve fitting on the Phase value in the same RFID tag information in the storage unit;
The data processing module is used for carrying out weighting operation on the statistical information and calculating the score of the RFID tag; the method is also used for selecting a storage unit with the highest RFID label score for RFID labels with the same ID numbers, and obtaining a mapping set of the RFID labels after positioning, wherein the mapping relation is < StoreUnit, storeGoodsInfo set >, storeGoodsInfo is article information in the storage unit and comprises the ID numbers;
The data processing module is also used for comparing the ID numbers in the pre-stored background database according to the ID numbers in the article information in the storage unit to find out the lost storage article;
The data processing module is also used for sequencing the objects in each storage unit which are already positioned, and obtaining the relative position sequence among the objects;
The data processing module is also used for comparing stored article information in a pre-stored background database and judging articles placed in the error storage unit.
Preferably, the mobile platform comprises a navigation module for locating a start position and an end position of each storage unit.
Preferably, the moving platform moves in a direction parallel to the storage unit.
Preferably, the locating each storage unit and obtaining the RFID source segment data in the storage unit includes the steps of:
recording the time of the antenna entering the storage device through the storage device starting point position fed back by the moving platform moving at a uniform speed, namely, starting time of the reader; the width of the preset storage unit is W, and the speed of the mobile platform is V; wherein, the mobile platform keeps a fixed distance with the storage device all the time in the motion process;
Distinguishing the time intervals: the time consumption of the antenna for scanning one storage unit is W/V, and the time interval of the antenna for scanning the nth storage unit is [ StartTime+ (n-1) × (W/V), startTime+n× (W/V) ];
traversing the source data scanned by the RFID antenna, dividing the source data into corresponding time intervals according to the time FIRSTSEENTIME value of the RFID tag signal detected in the source data, and obtaining the RFID source segment data in each storage unit.
Preferably, averageReciprocalSum is obtained by calculation of formulas (1) - (3):
（1）
ReciprocalSum= i=1，2，…，n（2）
average （3）
wherein: a is the RSSI value when the distance between the antenna and the RFID tag is 1 meter, N is the environmental attenuation factor, In order to acquire the ith group of data of the same RFID tag, the distance between the antenna and the RFID tag is ReciprocalSum, which is the sum of the inverse of the distance between the antenna of n groups of data and the RFID tag.
Preferably, the statistical information is weighted according to formula (4):
point=K1*MaxRSSI+K2*averageReciprocalSum+K3*positionRssi+K4*positionPhase （4）
Wherein, K 1、K2、K3、K4 is a preset weight coefficient, K 1,K2,K3,K4 is less than or equal to 0 and less than or equal to 1, at least one is not 0 and K 1+K2+K3+K4 =1.
Preferably, the sorting of the items inside each storage unit that has been located comprises the steps of:
For each storage unit, obtaining statistical information of RFID tags with the same ID number in the storage unit for each ID number in the item information StoreGoodsInfo in the storage unit;
And obtaining a distance value corresponding to positionRssi or positionPhase of each ID number, and sequencing the distance values from small to large to obtain corresponding OrderNum, so as to obtain the information of the articles in the storage unit with the serial numbers, wherein the serial numbers correspond to the position sequence of each article in the storage unit.
Preferably, the storage unit internal article information StoreGoodsInfo further includes a detected time MaxTime corresponding to the maximum RSSI value MaxRSSI;
The sorting of the items inside each storage unit that has been located includes the steps of:
and acquiring MaxTime in the article information in each storage unit, and sorting from small to large to obtain corresponding OrderNum, so as to obtain the article information in the storage unit with the serial number, wherein the serial number corresponds to the position sequence of each article in the storage unit.
Preferably, the RFID tag data rssiInfo further includes a time FIRSTSEENTIME when the RFID tag signal is detected;
The sorting of the items inside each storage unit that has been located includes the steps of:
for each storage unit, acquiring RFID tag data sets of all the same ID numbers in the source section data according to the ID number information in the article information in the storage unit, and recording the minimum FIRSTSEENTIME value corresponding to each ID number;
and sequencing the minimum FIRSTSEENTIME values from small to large to obtain corresponding OrderNum, and obtaining the information of the articles in the storage unit with the serial numbers, wherein the serial numbers correspond to the position sequence of each article in the storage unit.
Compared with the prior art, the invention provides a mobile inventory system based on an RFID technology, which comprises a mobile platform, a statistics and arrangement module, a data processing module and RFID scanning equipment; acquiring source segment data through RFID scanning equipment; positioning each storage unit through a mobile platform; the method comprises the steps that a plurality of groups of data of RFID tags are subjected to statistics arrangement through a statistics arrangement module, and statistics information of each RFID tag is obtained; the statistical information is weighted through a data processing module, and the article corresponding to the RFID tag is positioned in a storage unit with highest calculation score; searching for lost articles by the data processing module in comparison with the database; ordering all the articles in the storage unit; and finally, comparing the databases to find out the article placed in error. The method reduces the missing reading rate, eliminates the multi-reading objects, ensures the counting precision, effectively solves the problem of low counting precision when the phase signal is utilized for positioning in the prior art, is suitable for high-frequency and ultrahigh-frequency RFID technology, and has wide application range.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a flow chart of the main functions of a mobile inventory system based on RFID technology of the present invention;
fig. 2 is a block diagram of a mobile inventory system based on RFID technology according to the present invention.
Detailed Description
In order that the above-recited objects, features and advantages of the present application will become more readily apparent, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description.
The RFID technology consists of three parts: an antenna, a reader and an RFID tag. The radio frequency signal emitted by the antenna is reflected back by the tag after reaching the RFID tag, and the reader identifies the RFID tag through the received reflected signal, wherein the reflected signal comprises an RSSI signal.
The invention provides a mobile inventory system based on an RFID technology, which is shown in fig. 1 and 2, and comprises a mobile platform, a statistics and arrangement module, a data processing module and an RFID scanning device;
The mobile platform is used for carrying an RFID scanning device to scan RFID labels attached to each article in a storage device, wherein the storage device comprises K storage units, and K is a positive integer; and is further configured to locate each storage unit and obtain RFID source segment data within the storage unit.
Wherein: the source segment data includes a mapping of the storage unit information StoreUnit and each set of RFID tag data rssiInfo collected in the storage unit: < StoreUnit, rssiInfo set >, the RFID tag data rssiInfo includes an electronic tag ID number, a signal strength value RSSI when the RFID tag signal is detected, a Distance of an antenna from the RFID tag when the RFID tag signal is detected; multiple sets of data may be collected for each RFID tag. The ID number is typically TID information or EPC information.
In one implementation, the locating each storage unit and obtaining the RFID source segment data in the storage unit by the mobile platform includes the steps of:
recording the time of the antenna entering the storage device through the storage device starting point position fed back by the moving platform moving at a uniform speed, namely, starting time of the reader; the width of the preset storage unit is W, and the speed of the mobile platform is V; wherein, the mobile platform keeps a fixed distance with the storage device all the time in the motion process;
Distinguishing the time intervals: the time consumption of the antenna for scanning one storage unit is W/V, and the time interval of the antenna for scanning the nth storage unit is [ StartTime+ (n-1) × (W/V), startTime+n× (W/V) ];
traversing the source data scanned by the RFID antenna, dividing the source data into corresponding time intervals according to the time FIRSTSEENTIME value of the RFID tag signal detected in the source data, and obtaining the RFID source segment data in each storage unit.
The statistic arrangement module is used for carrying out statistic arrangement on a plurality of groups of data of the RFID tags in the source section data of each storage unit to obtain statistic information of each RFID tag in the source section data, wherein the statistic information at least comprises one of MaxRSSI, averageReciprocalSum, positionRssi, positionPhase; and the statistical information is also used for sending the statistical information to a data processing module.
Wherein:
MaxRSSI is the maximum RSSI value in the same RFID tag data;
averageReciprocalSum is the average value of the sum of the reciprocal distances between the antenna and the RFID tag;
positionRssi is the RSSI value corresponding to the peak, namely the highest point, of the curve obtained by performing distance-RSSI quadratic curve fitting on the RSSI value in the same RFID tag information in the storage unit; distance is the motion distance of the RFID antenna fed back by the mobile platform;
positionPhase is a Phase value corresponding to the peak, which is the peak of the curve obtained by performing distance-Phase quadratic curve fitting on the Phase value in the same RFID tag information in the storage unit.
The averageReciprocalSum is obtained by calculation of formulas (1) - (3):
（1）
ReciprocalSum= i=1，2，…，n（2）
average （3）
wherein: a is the RSSI value when the distance between the antenna and the RFID tag is 1 meter, N is the environmental attenuation factor, In order to acquire the ith group of data of the same RFID tag, the distance between the antenna and the RFID tag is ReciprocalSum, which is the sum of the inverse of the distance between the antenna of n groups of data and the RFID tag.
In one implementation, the performing the statistical sorting on the multiple sets of data of the RFID tag in the source segment data of each storage unit includes the following steps:
a. traversing all source segment data, and entering a step b;
b. C, traversing each RFID tag data in all source segment data, and entering a step c;
c. D, judging whether the current ID number appears or not, and if not, entering a step d; if yes, entering step e;
d. adding the record of the ID number:
ShowTime=1，
SumRSSI=RSSI，
ReciprocalSum=1/Distance；
Step g is carried out;
e. Updating the record of the ID number:
the ShowTime value is updated to ShowTime +1,
The SumRSSI value is updated to SumRSSI + RSSI,
Update ReciprocalSum value = ReciprocalSum +1/Distance;
Step f is entered;
f. judging whether the current RSSI value is larger than MaxRSSI, if so, entering the step g; if not, entering step h;
g. updating MaxRSSI =current RSSI value, maxtime= FIRSTSEENTIME, entering step h;
h. Judging whether all RFID tags are traversed, if yes, entering the step i, and if no, entering the step b;
i. Judging whether all source segment data are traversed, if yes, entering a step j, and if no, entering the step a;
j. and obtaining the processed post-segment data.
The mapping relation of the processed post-segment data is as follows: < StoreUnit, handledRssiInfo set >, handledRssiInfo includes an electronic tag ID number, the number of occurrences ShowTime for each ID number, the sum SumRSSI of RSSI values in the same RFID tag data, the average averageReciprocalSum of the distance sums, the maximum RSSI value MaxRSSI in the same RFID tag data, and the detected time MaxTime for the maximum RSSI value.
The data processing module is used for carrying out weighting operation on the statistical information and calculating the score of the RFID tag; and the method is also used for selecting a storage unit with the highest RFID label score for the RFID labels with the same ID numbers, and obtaining a mapping set of the RFID labels after positioning, wherein the mapping relation is < StoreUnit, storeGoodsInfo set >, storeGoodsInfo is article information in the storage unit and comprises the ID numbers.
In one implementation manner, the step of sending the statistical information to a data processing module for weighting operation and calculating the score of the RFID tag includes the following steps:
a. Traversing all the processed post-segment data, and entering a step b;
b. C, traversing all the storage units StoreUnit in the RFID tag information and the article positioning information in the processed post-section data, and entering a step c;
c. d, judging whether the ID number is positioned to a certain StoreUnit, if not, entering the step d; if yes, entering step e;
d. increasing the current item location information < ID number LocatedInfo set >;
e. weighting the statistical information according to the formula (4), recording the point values respectively, judging whether the current point value is more than the positioned point value, if so, entering the step f, otherwise, entering the step g;
point=K1*MaxRSSI+K2*averageReciprocalSum+K3*positionRssi+K4*positionPhase （4）
wherein, K 1、K2、K3、K4 is a preset weight coefficient, K 1,K2,K3,K4 is more than or equal to 0 and less than or equal to 1, at least one is not 0 and K 1+K2+K3+K4 =1;
f. Updating article positioning information < ID number LocatedInfo set >;
g. judging whether all RFID tag information is traversed, if yes, entering step h, and if no, entering step b;
h. Judging whether all the processed post-segment data are traversed, if yes, entering the step i, and if no, entering the step a;
i. And obtaining all article positioning information.
The mapping relationship of the article positioning information is < ID number, locatedInfo set >, which indicates that the ID number is positioned in the storage unit StoreUnit, where the positioning information LocatedInfo includes StoreUnit, showTime, sumRSSI, distance, averageReciprocalSum, maxRSSI and MaxTime.
In this step, the value of K 1、K2、K3、K4 may be set according to different environments, for example, in this embodiment, K 1=0.6,K2=0.2,K3=0.1,K4 =0.1.
The data processing module is also used for comparing the ID numbers in the pre-stored background database according to the ID numbers in the article information in the storage unit, and finding out the lost storage article.
The data processing module is also used for sequencing the objects in each storage unit which are positioned completely, and obtaining the relative position sequence among the objects.
In one implementation, the sorting of the items within each storage unit that has been located includes the steps of:
For each storage unit, obtaining statistical information of RFID tags with the same ID number in the storage unit for each ID number in the item information StoreGoodsInfo in the storage unit;
And obtaining a distance value corresponding to positionRssi or positionPhase of each ID number, and sequencing the distance values from small to large to obtain corresponding OrderNum, so as to obtain the information of the articles in the storage unit with the serial numbers, wherein the serial numbers correspond to the position sequence of each article in the storage unit.
In another implementation, the storage unit internal article information StoreGoodsInfo further includes a detected time MaxTime corresponding to the maximum RSSI value MaxRSSI;
The sorting of the items inside each storage unit that has been located includes the steps of:
and acquiring MaxTime in the article information in each storage unit, and sorting from small to large to obtain corresponding OrderNum, so as to obtain the article information in the storage unit with the serial number, wherein the serial number corresponds to the position sequence of each article in the storage unit.
In another implementation, the RFID tag data rssiInfo further includes a time FIRSTSEENTIME when the RFID tag signal is detected;
The sorting of the items inside each storage unit that has been located includes the steps of:
for each storage unit, acquiring RFID tag data sets of all the same ID numbers in the source section data according to the ID number information in the article information in the storage unit, and recording the minimum FIRSTSEENTIME value corresponding to each ID number;
and sequencing the minimum FIRSTSEENTIME values from small to large to obtain corresponding OrderNum, and obtaining the information of the articles in the storage unit with the serial numbers, wherein the serial numbers correspond to the position sequence of each article in the storage unit.
The data processing module is also used for comparing stored article information in a pre-stored background database and judging articles placed in the error storage unit.
The mobile platform comprises a navigation module, wherein the navigation module is used for positioning the starting point position and the end point position of each storage unit.
The moving platform moves in a direction parallel to the storage unit.
Compared with the prior art, the invention provides a mobile inventory system based on an RFID technology, which comprises a mobile platform, a statistics and arrangement module, a data processing module and RFID scanning equipment; acquiring source segment data through RFID scanning equipment; positioning each storage unit through a mobile platform; the method comprises the steps that a plurality of groups of data of RFID tags are subjected to statistics arrangement through a statistics arrangement module, and statistics information of each RFID tag is obtained; the statistical information is weighted through a data processing module, and the article corresponding to the RFID tag is positioned in a storage unit with highest calculation score; searching for lost articles by the data processing module in comparison with the database; ordering all the articles in the storage unit; and finally, comparing the databases to find out the article placed in error. The method reduces the missing reading rate, eliminates the multi-reading objects, ensures the counting precision, effectively solves the problem of low counting precision when the phase signal is utilized for positioning in the prior art, is suitable for high-frequency and ultrahigh-frequency RFID technology, and has wide application range.
The present invention provides a mobile inventory system based on RFID technology, and the method and the way of implementing the technical solution are numerous, the above is only a preferred embodiment of the present invention, it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention. The components not explicitly described in this embodiment can be implemented by using the prior art.
Claims (9)
1. The mobile inventory system based on the RFID technology is characterized by comprising a mobile platform, a statistics and arrangement module, a data processing module and RFID scanning equipment;
The mobile platform is used for carrying an RFID scanning device to scan RFID labels attached to each article in a storage device, wherein the storage device comprises K storage units, and K is a positive integer; the RFID source segment data processing unit is also used for positioning each storage unit and obtaining the RFID source segment data in the storage unit;
Wherein: the source segment data includes a mapping of the storage unit information StoreUnit and each set of RFID tag data rssiInfo collected in the storage unit: < StoreUnit, rssiInfo set >, the RFID tag data rssiInfo includes an electronic tag ID number, a signal strength value RSSI when the RFID tag signal is detected, a Distance of an antenna from the RFID tag when the RFID tag signal is detected; multiple sets of data may be collected for each RFID tag;
The statistic arrangement module is used for carrying out statistic arrangement on a plurality of groups of data of the RFID tags in the source section data of each storage unit to obtain statistic information of each RFID tag in the source section data, wherein the statistic information at least comprises one of MaxRSSI, averageReciprocalSum, positionRssi, positionPhase; the statistical information is also used for sending the statistical information to a data processing module;
Wherein:
MaxRSSI is the maximum RSSI value in the same RFID tag data;
averageReciprocalSum is the average value of the sum of the reciprocal distances between the antenna and the RFID tag;
positionRssi is the RSSI value corresponding to the peak, namely the highest point, of the curve obtained by performing distance-RSSI quadratic curve fitting on the RSSI value in the same RFID tag information in the storage unit; distance is the motion distance of the RFID antenna fed back by the mobile platform;
positionPhase is a Phase value corresponding to the peak, which is the highest point, of a curve obtained by performing distance-Phase quadratic curve fitting on the Phase value in the same RFID tag information in the storage unit;
The data processing module is used for carrying out weighting operation on the statistical information and calculating the score of the RFID tag; the method is also used for selecting a storage unit with the highest RFID label score for RFID labels with the same ID numbers, and obtaining a mapping set of the RFID labels after positioning, wherein the mapping relation is < StoreUnit, storeGoodsInfo set >, storeGoodsInfo is article information in the storage unit and comprises the ID numbers;
The data processing module is also used for comparing the ID numbers in the pre-stored background database according to the ID numbers in the article information in the storage unit to find out the lost storage article;
The data processing module is also used for sequencing the objects in each storage unit which are already positioned according to the position sequence of each object in the storage unit, so as to obtain the relative position sequence among the objects;
The data processing module is also used for comparing stored article information in a pre-stored background database and judging articles placed in the error storage unit.
2. The RFID technology-based mobile inventory system of claim 1, wherein the mobile platform includes a navigation module for locating a start location and an end location of each memory cell.
3. The mobile inventory system based on RFID technology of claim 1, wherein the mobile platform moves in a direction parallel to the storage unit.
4. The mobile inventory system based on RFID technology of claim 1, wherein said locating each memory cell and obtaining RFID source segment data within said memory cell comprises the steps of:
recording the time of the antenna entering the storage device through the storage device starting point position fed back by the moving platform moving at a uniform speed, namely, starting time of the reader; the width of the preset storage unit is W, and the speed of the mobile platform is V;
Distinguishing the time intervals: the time consumption of the antenna for scanning one storage unit is W/V, and the time interval of the antenna for scanning the nth storage unit is [ StartTime+ (n-1) × (W/V), startTime+n× (W/V) ];
traversing the source data scanned by the RFID antenna, dividing the source data into corresponding time intervals according to the time FIRSTSEENTIME value of the RFID tag signal detected in the source data, and obtaining the RFID source segment data in each storage unit.
5. The RFID technology-based mobile inventory system of claim 1, wherein averageReciprocalSum is calculated by equations (1) - (3):
Wherein: a is RSSI value when the distance between the antenna and the RFID tag is 1 meter, N is environmental attenuation factor, d i is distance between the antenna and the RFID tag when the ith group of data of the same RFID tag is acquired, reciprocalSum is reciprocal sum of the distances between the antenna and the RFID tag of N groups of data.
6. The RFID technology-based mobile inventory system of claim 5, wherein the statistical information is weighted according to equation (4):
point＝K1*MaxRSSI+K2*averageReciprocalSum+K3*positionRssi+K4*positionPhase (4)
Wherein, K 1、K2、K3、K4 is a preset weight coefficient, K 1,K2,K3,K4 is less than or equal to 0 and less than or equal to 1, at least one is not 0 and K 1+K2+K3+K4 =1.
7. The RFID technology based mobile inventory system of claim 1, wherein the ordering of items within each storage unit that has been located includes the steps of:
For each storage unit, obtaining statistical information of RFID tags with the same ID number in the storage unit for each ID number in the item information StoreGoodsInfo in the storage unit;
And obtaining a distance value corresponding to positionRssi or positionPhase of each ID number, and sequencing the distance values from small to large to obtain corresponding OrderNum, so as to obtain the information of the articles in the storage unit with the serial numbers, wherein the serial numbers correspond to the position sequence of each article in the storage unit.
8. The RFID technology-based mobile inventory system of claim 1, wherein the memory unit internal item information StoreGoodsInfo further includes a detected time MaxTime corresponding to a maximum RSSI value MaxRSSI;
The sorting of the items inside each storage unit that has been located includes the steps of:
and acquiring MaxTime in the article information in each storage unit, and sorting from small to large to obtain corresponding OrderNum, so as to obtain the article information in the storage unit with the serial number, wherein the serial number corresponds to the position sequence of each article in the storage unit.
9. The mobile inventory system based on RFID technology of claim 1, wherein the RFID tag data rssiInfo further includes a time FIRSTSEENTIME when the RFID tag signal is detected;
The sorting of the items inside each storage unit that has been located includes the steps of:
for each storage unit, acquiring RFID tag data sets of all the same ID numbers in the source section data according to the ID number information in the article information in the storage unit, and recording the minimum FIRSTSEENTIME value corresponding to each ID number;
and sequencing the minimum FIRSTSEENTIME values from small to large to obtain corresponding OrderNum, and obtaining the information of the articles in the storage unit with the serial numbers, wherein the serial numbers correspond to the position sequence of each article in the storage unit.
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| CN114792120B (en) * | 2021-01-26 | 2024-03-01 | 上海威瞳视觉技术有限公司 | Method for ordering articles in storage unit |
| CN114997193B (en) * | 2021-03-01 | 2025-10-03 | 浙江海康科技有限公司 | A tag positioning method based on RFID technology |
| CN116090956A (en) * | 2023-02-07 | 2023-05-09 | 浙江瑞华康源科技有限公司 | Storehouse inventory and positioning method based on time delay scanning and label acousto-optic prompt |
| CN117151146B (en) * | 2023-11-01 | 2024-02-27 | 山东泰宝信息科技集团有限公司 | Blood tracking and real-time inventory management system based on RFID support |
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