CN114792120A - Method for sorting articles in storage unit - Google Patents
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Abstract
The invention provides a method for sequencing articles in a storage unit, which adopts a plurality of RFID antennas, compensates the scanning time of the antennas in combination with the scanning direction of the storage unit while acquiring more tag data, unifies the data of the plurality of antennas into a single antenna for processing, and sequences the compensated time in combination with the scanning direction to obtain the final relative position sequence among the articles, wherein the average error range is between 1.5 and 2 articles. The method has the advantages that the reading missing rate is reduced, meanwhile, the sequencing precision is guaranteed, the problem that the sequencing error inside the storage unit is large in the prior art is effectively solved, and the method is suitable for high-frequency and ultrahigh-frequency RFID technologies and wide in application range.
Description
Technical Field
The invention relates to the technical field of RFID, in particular to a method for sequencing articles in a storage unit.
Background
Radio Frequency Identification (RFID) is a non-contact automatic Identification technology, and obtains tag data and identifies an article by using a wireless signal, and is mainly classified into a high-Frequency technology and an ultrahigh-Frequency technology. The RFID technology has the advantages of high identification speed, large data storage capacity, high safety and the like, and is applied to inventory positioning management of stored articles in industries such as storage management, logistics, books and the like.
Because the positioning of the RFID to the tag is related to the power and distance, the power is high, and the RFID information of many objects in the same storage unit is easily read, so that the relative position cannot be accurately positioned, and if the power is too low or the distance is too long, the reading is missed due to too weak signal, so a specific sorting method is usually required to perform screening sorting on the tag signal which is read more under the condition of high power. In the existing method for positioning stored articles, the articles can only be positioned into the storage unit, and the average error of the internal sequencing of the storage unit is large, for example, when the method is used for sequencing books in the same layer of bookshelf, the average error is 5-10.
Disclosure of Invention
In view of the above disadvantages, the technical problem to be solved by the present invention is to provide a method for sorting articles in a storage unit, which uses a plurality of RFID antennas, obtains more tag data, performs compensation processing on antenna scanning time in combination with the scanning direction of the storage unit, unifies the data of the plurality of antennas into a single antenna for processing, and sorts the compensated time in combination with the scanning direction to obtain a final relative position sequence between the articles, wherein the average error range is between 1.5 and 2 articles. The method has the advantages that the missing reading rate is reduced, the sorting precision is guaranteed, the problem of large sorting error in the storage unit in the prior art is effectively solved, and the method is suitable for high-frequency and ultrahigh-frequency RFID technologies and wide in application range.
The purpose of the invention is realized by the following technical scheme:
a method of sorting items within a storage unit, the method comprising the steps of:
scanning an RFID label attached to each article in storage equipment by carrying N RFID antennas through a mobile platform, wherein the storage equipment comprises K storage units, and N, K are positive integers; positioning each storage unit through a mobile platform and obtaining RFID source segment data in the storage unit;
wherein: the source segment data comprises the storage unit information storeUnit and the mapping of each RFID tag data rsinfo set collected in the storage unit: < storeUnit, rssinfo set >, the RFID tag data rssinfo includes an electronic tag ID number, a signal strength value RSSI when the RFID tag signal is detected, an antenna number antennaNum when the RFID tag signal is detected, and a detection time; multiple sets of data may be collected for each RFID tag;
performing time compensation processing on detection time in the RFID source segment data, and unifying multiple groups of data of the same RFID tag detected by different antennas on one antenna by combining the scanning direction of a storage unit to obtain compensated detection time realTime; the mapping relation of the scanning direction of the storage unit is < storeUnit, scanDirection >, the storeUnit is storage unit information, and the scanDirection is the scanning direction of the storage unit, specifically from left to right or from right to left;
and sequencing the positioned articles in each storage unit according to the compensated detection time realTime to obtain the position sequence of each article in the storage unit.
Preferably, N = 2.
Preferably, the step of unifying multiple sets of data of the same RFID tag detected by different antennas onto one antenna to obtain the compensated detection time realTime includes the following steps:
calculating a compensated time difference complestratetime according to equation (1):
wherein: distance is the relative position distance between the two RFID antennas, and v is the moving speed of the mobile platform;
according to the scanning direction of each storage unit, time compensation processing is carried out on the next antenna along the scanning direction, and the time compensation processing is unified to the previous antenna along the scanning direction; obtaining the compensated detection time realTime of the RFID tag data of the next antenna according to the formula (2):
realTime = time for the RFID tag data of the previous antenna in the scanning direction.
Preferably, the sorting the items in each storage unit that have been located according to the post-compensation detection time realTime includes the following steps:
for each storage unit, acquiring all RFID tag data sets with the same ID number in the source section data according to the ID number information in the article information in the storage unit;
performing curve fitting on the compensated detection time realTime and the signal strength value RSSI, and selecting the realTime corresponding to the peak of each ID number;
and sequencing the realTime values from small to large to obtain corresponding OrderNum, obtaining the article information in the storage unit with the sequence numbers, and determining the position sequence of each article in the storage unit according to the sequence numbers and the scanning direction.
Compared with the prior art, the invention provides a storage unit internal article sequencing method, which adopts a plurality of RFID antennas, compensates the antenna scanning time by combining the scanning direction of the storage unit while acquiring more label data, unifies the data of the plurality of antennas into a single antenna for processing, and sequences the compensated time by combining the scanning direction to obtain the final relative position sequence among the articles, wherein the average error range is between 1.5 and 2 articles. The method has the advantages that the reading missing rate is reduced, meanwhile, the sequencing precision is guaranteed, the problem that the sequencing error inside the storage unit is large in the prior art is effectively solved, and the method is suitable for high-frequency and ultrahigh-frequency RFID technologies and wide in 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 a method for sorting items in a storage unit according to the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.
The RFID technology consists of three parts: antennas, readers and RFID tags. Radio frequency signals transmitted by the antenna can be reflected back by the RFID label after reaching the RFID label, and the reader identifies the RFID label through the received reflected signals, wherein the reflected signals comprise RSSI signals.
The invention provides a sorting method for articles in a storage unit, which comprises the following steps of:
scanning an RFID label attached to each article in storage equipment by carrying N RFID antennas through a mobile platform, wherein the storage equipment comprises K storage units, and N, K are positive integers; positioning each storage unit through a mobile platform and obtaining RFID source segment data in the storage unit;
wherein: the source segment data comprises the storage unit information storeUnit and the mapping of each RFID tag data rsinfo set collected in the storage unit: < StoreUnit, rssinfo set >, the RFID tag data rssinfo includes an electronic tag ID number, a signal strength value RSSI when the RFID tag signal is detected, an antenna number antennaNum when the RFID tag signal is detected, and a detection time; multiple sets of data may be collected for each RFID tag;
performing time compensation processing on detection time in the RFID source segment data, and unifying multiple groups of data of the same RFID tag detected by different antennas on one antenna by combining the scanning direction of a storage unit to obtain compensated detection time realTime; the mapping relation of the scanning direction of the storage unit is < storeUnit, scanDirection >, the storeUnit is storage unit information, and the scanDirection is the scanning direction of the storage unit, specifically from left to right or from right to left;
and sequencing the positioned articles in each storage unit according to the compensated detection time realTime to obtain the position sequence of each article in the storage unit. The article in each storage unit that has been located is an article obtained by the existing RFID technology (e.g., the "a location method based on RFID technology" disclosed in patent CN 110954864A).
In one implementation, N = 2. Two left and right antennas are used, and when antennaNum =1, the left antenna is shown, and when antennaNum =2, the right antenna is shown.
The method for unifying multiple groups of data of the same RFID label detected by different antennas on one antenna to obtain the detection time realTime after compensation comprises the following steps:
the compensated time difference complementatime is calculated according to equation (1):
wherein: distance is the relative position distance between the two RFID antennas, and v is the moving speed of the mobile platform;
according to the scanning direction of each storage unit, time compensation processing is carried out on the next antenna along the scanning direction, and the time compensation processing is unified to the previous antenna along the scanning direction; obtaining a compensated detection time realTime of the RFID tag data of the next antenna according to formula (2):
realTime = time for the RFID tag data of the previous antenna in the scanning direction.
In this step, if the scanning direction of the storage unit is from left to right, the left antenna reading time is compensated, and the time unified as the right antenna is processed; and if the scanning direction of the storage unit is from right to left, compensating the reading time of the right antenna, and processing the time uniformly serving as the time of the left antenna.
The step of sequencing the positioned articles in each storage unit according to the compensated detection time realTime comprises the following steps:
for each storage unit, acquiring all RFID tag data sets with the same ID number in the source section data according to the ID number information in the article information in the storage unit;
performing curve fitting on the compensated detection time realTime and the signal strength value RSSI, and selecting the realTime corresponding to the peak of each ID number;
and sequencing the realTime values from small to large to obtain corresponding OrderNum, obtaining the article information in the storage unit with the sequence numbers, and determining the position sequence of each article in the storage unit according to the sequence numbers and the scanning direction. In this step, the serial numbers are sequentially increased in the scanning direction from left to right, but if the mobile platform scans from right to left, the sequencing is just opposite, so that whether the position sequence needs to be inverted is judged according to the scanning direction of each storage unit, and the final correct position sequence is obtained.
Compared with the prior art, the invention provides a storage unit internal article sequencing method, which adopts a plurality of RFID antennas, compensates the antenna scanning time by combining the scanning direction of the storage unit while acquiring more label data, unifies the data of the plurality of antennas into a single antenna for processing, and sequences the compensated time by combining the scanning direction to obtain the final relative position sequence among the articles, wherein the average error range is between 1.5 and 2 articles. The method has the advantages that the reading missing rate is reduced, meanwhile, the sequencing precision is guaranteed, the problem that the sequencing error inside the storage unit is large in the prior art is effectively solved, and the method is suitable for high-frequency and ultrahigh-frequency RFID technologies and wide in application range.
While the present invention provides a method for sorting articles in a storage unit, and a number of methods and ways for implementing the same, the above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and amendments can be made without departing from the principle of the present invention, and these modifications and amendments should also be considered as the protection scope of the present invention. All the components not specified in this embodiment can be implemented by the prior art.
Claims (4)
1. A method of sorting items within a storage unit, the method comprising the steps of:
carrying N RFID antennas through a mobile platform to scan an RFID label attached to each article in storage equipment, wherein the storage equipment comprises K storage units, and N, K are positive integers; positioning each storage unit through a mobile platform and obtaining RFID source segment data in the storage unit;
wherein: the source segment data comprises the storage unit information storeUnit and the mapping of each RFID tag data rsinfo set collected in the storage unit: < StoreUnit, rssinfo set >, the RFID tag data rssinfo includes an electronic tag ID number, a signal strength value RSSI when the RFID tag signal is detected, an antenna number antennaNum when the RFID tag signal is detected, and a detection time; multiple sets of data may be collected for each RFID tag;
performing time compensation processing on the detection time in the RFID source segment data, and unifying multiple groups of data of the same RFID label detected by different antennas on one antenna by combining the scanning direction of a storage unit to obtain the compensated detection time realTime; the mapping relationship of the scanning direction of the storage unit is < storeUnit, scanDirection >, the storeUnit is storage unit information, scanDirection is the scanning direction of the storage unit, and specifically is from left to right or from right to left;
and sequencing the positioned articles in each storage unit according to the compensated detection time realTime to obtain the position sequence of each article in the storage unit.
2. A method of sorting items inside a storage unit according to claim 1, wherein N = 2.
3. The method for sorting items in a storage unit according to claim 2, wherein the step of unifying multiple sets of data of the same RFID tag detected by different antennas onto one antenna to obtain a compensated detection time realTime comprises the steps of:
the compensated time difference complementatime is calculated according to equation (1):
wherein: distance is the relative position distance between the two RFID antennas, and v is the moving speed of the mobile platform;
according to the scanning direction of each storage unit, performing time compensation processing on the next antenna along the scanning direction, and unifying the time compensation processing to the previous antenna along the scanning direction; obtaining the compensated detection time realTime of the RFID tag data of the next antenna according to the formula (2):
realTime = time for the RFID tag data of the previous antenna in the scanning direction.
4. The method according to claim 1, wherein said sorting the items in each storage unit that have been located according to the compensated detection time realTime comprises the following steps:
for each storage unit, acquiring all RFID tag data sets with the same ID number in the source segment data according to ID number information in the article information in the storage unit;
performing curve fitting on the compensated detection time realTime and the signal strength value RSSI, and selecting the realTime corresponding to the peak of each ID number;
and sequencing the realTime values from small to large to obtain corresponding OrderNum, obtaining the article information in the storage unit with the sequence numbers, and determining the position sequence of each article in the storage unit according to the sequence numbers and the scanning direction.
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| CN110954864A (en) * | 2019-12-05 | 2020-04-03 | 上海威瞳视觉技术有限公司 | Positioning method based on RFID technology |
| CN111123195A (en) * | 2019-12-05 | 2020-05-08 | 上海威瞳视觉技术有限公司 | RFID (radio frequency identification) checking system for checking stored articles |
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- 2021-01-26 CN CN202110102906.4A patent/CN114792120B/en active Active
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| US20140184391A1 (en) * | 2012-12-29 | 2014-07-03 | Meps Real-Time, Inc. | System and method of optimizing the process of identifying items tagged with rfid tags in an enclosed shielded space |
| CN110954863A (en) * | 2019-12-05 | 2020-04-03 | 上海威瞳视觉技术有限公司 | RFID positioning method oriented to storage article positioning |
| CN110954864A (en) * | 2019-12-05 | 2020-04-03 | 上海威瞳视觉技术有限公司 | Positioning method based on RFID technology |
| CN111123195A (en) * | 2019-12-05 | 2020-05-08 | 上海威瞳视觉技术有限公司 | RFID (radio frequency identification) checking system for checking stored articles |
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