CN114792120B - Method for ordering articles in storage unit - Google Patents
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- CN114792120B CN114792120B CN202110102906.4A CN202110102906A CN114792120B CN 114792120 B CN114792120 B CN 114792120B CN 202110102906 A CN202110102906 A CN 202110102906A CN 114792120 B CN114792120 B CN 114792120B
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- 238000005516 engineering process Methods 0.000 abstract description 10
- 238000007726 management method Methods 0.000 description 2
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Abstract
The invention provides a method for ordering articles in a storage unit, which adopts a plurality of RFID antennas, performs compensation processing of antenna scanning time by combining the scanning direction of the storage unit while acquiring more tag data, processes the data of the plurality of antennas into a single antenna, orders the compensated time by combining the scanning direction, and obtains the relative position sequence among final articles, wherein the average error range is between 1.5 and 2 articles. The method has the advantages that the method reduces the read omission ratio, ensures the ordering precision, effectively solves the problem of large ordering error in the storage unit in the prior art, is suitable for high-frequency and ultrahigh-frequency RFID technology, and has wide application range.
Description
Technical Field
The invention relates to the technical field of RFID, in particular to a method for ordering articles in a storage unit.
Background
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 classified into high frequency and ultra-high frequency technologies. 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 the industries of warehouse management, logistics, books and the like.
Because the RFID is related to the positioning, power and distance of the tag, the RFID information of a plurality of objects in the same storage unit is easy to read due to high power, so that the relative position cannot be accurately positioned, and too small power or far distance can cause missed reading due to too weak signal, so that a specific sorting method is generally required to sort the multi-read tag signals under the high power condition. In the existing storage article positioning method, the articles can only be positioned in the storage unit, and the average error of the internal sequencing of the storage unit is larger, for example, when books are sequenced in the same bookshelf layer, the average error is 5-10 books.
Disclosure of Invention
Aiming at the defects, the technical problem solved by the invention is to provide a method for ordering articles in a storage unit, which adopts a plurality of RFID antennas, performs compensation processing of antenna scanning time in combination with the scanning direction of the storage unit while acquiring more tag data, processes the data of the plurality of antennas into a single antenna, orders the compensated time in combination with the scanning direction to obtain the relative position sequence among final articles, and has an average error range of 1.5-2 articles. The method has the advantages that the method reduces the read omission ratio, ensures the ordering precision, effectively solves the problem of large ordering error in the storage unit 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:
a method of ordering items within a storage unit, the ordering method comprising the steps of:
the method comprises the steps that N RFID antennas are carried on a mobile platform to scan RFID tags attached to each article in storage equipment, wherein the storage equipment comprises K storage units, and N, K is a positive integer; positioning each storage unit through a mobile platform and obtaining RFID source segment data in the storage unit;
wherein: the source segment data includes a mapping of the storage unit information storage unit and each RFID tag data rssiInfo set collected in the storage unit: < store Unit, rssiInfo set >, said RFID tag data rssiInfo includes electronic tag ID number, signal intensity value RSSI when detecting said RFID tag signal, antenna number antannaNum and detection time when detecting said RFID tag signal; 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 combining the scanning direction of a storage unit, unifying multiple groups of data of the same RFID tag detected by different antennas on one antenna to obtain compensated detection time realtem; the mapping relation of the scanning direction of the storage unit is < storage unit, scan direction >, the storage unit is storage unit information, and the scan direction is the scanning direction of the storage unit, specifically from left to right or from right to left;
and sorting the objects in each storage unit which are already positioned according to the compensated detection time realtem to obtain the position sequence of each object in the storage unit.
Preferably, n=2.
Preferably, the unifying multiple sets of data of the same RFID tag detected by different antennas to one antenna to obtain compensated detection time realtem includes the following steps:
the compensated time difference compnsatetime is calculated according to equation (1):
（1）
wherein: distance is the relative position distance between two RFID antennas, and v is the moving speed of the moving platform;
according to the scanning direction of each storage unit, performing time compensation processing on a later antenna along the scanning direction, and unifying the time compensation processing on the former antenna along the scanning direction; obtaining a post-compensation detection time realtem of the RFID tag data of the latter antenna according to formula (2):
（2）
for RFID tag data of the previous antenna in the scanning direction, realtem=time.
Preferably, the sorting the items in each storage unit after the positioning is finished according to the compensated detection time realtem includes the following steps:
for each storage unit, acquiring an RFID tag data set 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 realtem and the signal strength value RSSI, and selecting realtem corresponding to the peak of each ID number;
and sequencing the realtem values from small to large to obtain corresponding OrderNum, obtaining the information of the articles in the storage unit with the serial numbers, and determining the position sequence of each article in the storage unit according to the serial numbers and the scanning direction.
Compared with the prior art, the invention provides a method for ordering articles in a storage unit, which comprises the steps of adopting a plurality of RFID antennas, carrying out compensation processing on antenna scanning time in combination with the scanning direction of the storage unit while acquiring more tag data, processing the data of the plurality of antennas into a single antenna, and ordering the compensated time in combination with the scanning direction to obtain the relative position sequence among final articles, wherein the average error range is between 1.5 and 2 articles. The method has the advantages that the method reduces the read omission ratio, ensures the ordering precision, effectively solves the problem of large ordering error in the storage unit 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 a method for sorting items within a memory cell 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 invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
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 method for ordering articles in a storage unit, as shown in fig. 1, which comprises the following steps:
the method comprises the steps that N RFID antennas are carried on a mobile platform to scan RFID tags attached to each article in storage equipment, wherein the storage equipment comprises K storage units, and N, K is a positive integer; positioning each storage unit through a mobile platform and obtaining RFID source segment data in the storage unit;
wherein: the source segment data includes a mapping of the storage unit information storage unit and each RFID tag data rssiInfo set collected in the storage unit: < store Unit, rssiInfo set >, said RFID tag data rssiInfo includes electronic tag ID number, signal intensity value RSSI when detecting said RFID tag signal, antenna number antannaNum and detection time when detecting said RFID tag signal; 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 combining the scanning direction of a storage unit, unifying multiple groups of data of the same RFID tag detected by different antennas on one antenna to obtain compensated detection time realtem; the mapping relation of the scanning direction of the storage unit is < storage unit, scan direction >, the storage unit is storage unit information, and the scan direction is the scanning direction of the storage unit, specifically from left to right or from right to left;
and sorting the objects in each storage unit which are already positioned according to the compensated detection time realtem to obtain the position sequence of each object in the storage unit. The article in each storage unit that has been positioned is an article that has been positioned to each storage unit obtained by an existing RFID technology (such as "an RFID technology-based positioning method" disclosed in patent CN110954864 a).
In one implementation, n=2. Left and right antennas are used, and when antannaNum=1, the left antenna is indicated, and when antannaNum=2, the right antenna is indicated.
The method for unifying multiple groups of data of the same RFID tag detected by different antennas to one antenna to obtain compensated detection time realtem comprises the following steps:
the compensated time difference compnsatetime is calculated according to equation (1):
（1）
wherein: distance is the relative position distance between two RFID antennas, and v is the moving speed of the moving platform;
according to the scanning direction of each storage unit, performing time compensation processing on a later antenna along the scanning direction, and unifying the time compensation processing on the former antenna along the scanning direction; obtaining a post-compensation detection time realtem of the RFID tag data of the latter antenna according to formula (2):
（2）
for RFID tag data of the previous antenna in the scanning direction, realtem=time.
In the step, if the scanning direction of the storage unit is from left to right, compensating the reading time of the left antenna and uniformly processing the time of the right antenna; if the scanning direction of the storage unit is from right to left, the reading time of the right antenna is compensated, and the reading time is uniformly processed as the time of the left antenna.
The sorting of the articles in each storage unit after the positioning is finished according to the compensated detection time realtem comprises the following steps:
for each storage unit, acquiring an RFID tag data set 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 realtem and the signal strength value RSSI, and selecting realtem corresponding to the peak of each ID number;
and sequencing the realtem values from small to large to obtain corresponding OrderNum, obtaining the information of the articles in the storage unit with the serial numbers, and determining the position sequence of each article in the storage unit according to the serial numbers and the scanning direction. In this step, the sequence numbers are sequentially increased in the left-to-right scanning direction, but if the moving platform scans from right to left, the sequence is just opposite, so that it is determined whether the position sequence needs to be inverted 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 method for ordering articles in a storage unit, which comprises the steps of adopting a plurality of RFID antennas, carrying out compensation processing on antenna scanning time in combination with the scanning direction of the storage unit while acquiring more tag data, processing the data of the plurality of antennas into a single antenna, and ordering the compensated time in combination with the scanning direction to obtain the relative position sequence among final articles, wherein the average error range is between 1.5 and 2 articles. The method has the advantages that the method reduces the read omission ratio, ensures the ordering precision, effectively solves the problem of large ordering error in the storage unit in the prior art, is suitable for high-frequency and ultrahigh-frequency RFID technology, and has wide application range.
The present invention provides a method for sorting articles in a storage unit, and the method and the way for realizing the technical scheme are numerous, the above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention, without departing from the principle of the present invention. The components not explicitly described in this embodiment can be implemented by using the prior art.
Claims (2)
1. A method of ordering items within a storage unit, the method comprising the steps of:
the method comprises the steps that N RFID antennas are carried on a mobile platform to scan RFID tags attached to each article in storage equipment, wherein the storage equipment comprises K storage units, and N, K is a positive integer; positioning each storage unit through a mobile platform and obtaining RFID source segment data in the storage unit;
wherein: the source segment data includes a mapping of the storage unit information storage unit and each RFID tag data rssiInfo set collected in the storage unit: < store Unit, rssiInfo set >, said RFID tag data rssiInfo includes electronic tag ID number, signal intensity value RSSI when detecting said RFID tag signal, antenna number antannaNum and detection time when detecting said RFID tag signal; 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 combining the scanning direction of a storage unit, unifying multiple groups of data of the same RFID tag detected by different antennas on one antenna to obtain compensated detection time realtem; the mapping relation of the scanning direction of the storage unit is < storage unit,
the storage unit is storage unit information, and the scan direction is the scanning direction of the storage unit, specifically from left to right or from right to left;
sorting the articles in each storage unit after the positioning is finished according to the compensated detection time realtem to obtain the position sequence of each article in the storage unit;
said n=2;
the method for unifying multiple groups of data of the same RFID tag detected by different antennas to one antenna to obtain compensated detection time realtem comprises the following steps:
the compensated time difference compnsatetime is calculated according to equation (1):
wherein: distance is the relative position distance between two RFID antennas, and v is the moving speed of the moving platform;
according to the scanning direction of each storage unit, performing time compensation processing on a later antenna along the scanning direction, and unifying the time compensation processing on the former antenna along the scanning direction; obtaining a post-compensation detection time realtem of the RFID tag data of the latter antenna according to formula (2):
realTime＝time+compensateTime (2)
for RFID tag data of the previous antenna in the scanning direction, realtem=time.
2. The method of claim 1, wherein the sorting the items in each of the storage units that have been located according to the compensated detection time realtem comprises the steps of:
for each storage unit, acquiring an RFID tag data set 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 realtem and the signal strength value RSSI, and selecting realtem corresponding to the peak of each ID number;
and sequencing the realtem values from small to large to obtain corresponding OrderNum, obtaining the information of the articles in the storage unit with the serial numbers, and determining the position sequence of each article in the storage unit according to the serial 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 |
| 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 |
| 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 |
| CN111191748A (en) * | 2019-12-05 | 2020-05-22 | 上海威瞳视觉技术有限公司 | Mobile checking system based on RFID technology |
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| US9349030B2 (en) * | 2012-12-29 | 2016-05-24 | Meps Real-Time, Inc. | System and method of optimizing the process of identifying items tagged with RFID tags in an enclosed shielded space |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| 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 |
| CN111191748A (en) * | 2019-12-05 | 2020-05-22 | 上海威瞳视觉技术有限公司 | Mobile checking system based on RFID technology |
Non-Patent Citations (1)
| Title |
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| 基于读写器功率扫描的无线射频识别定位;李晓银;闫连山;潘炜;罗斌;郭振;郭庆峰;;计算机工程;20130815(08);全文 * |
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