CN111191748A - Mobile checking system based on RFID technology - Google Patents
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- 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
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Abstract
The invention discloses a mobile checking system based on an RFID (radio frequency identification) technology, which comprises a mobile platform, a statistical sorting module, a data processing module and an RFID scanning device, wherein the mobile platform is connected with the statistical sorting module through a wireless network; obtaining source segment data through RFID scanning equipment; positioning each storage unit through the mobile platform; carrying out statistical arrangement on multiple groups of data of the RFID tags through a statistical arrangement module to obtain statistical information of each RFID tag; performing weighting operation on the statistical information through a data processing module, and positioning the article corresponding to the RFID label to a storage unit with the highest operation score; searching lost articles through the data processing module by comparing the database; sequencing all articles in the storage unit; and finally, comparing the database to find out the article with the wrong placement. The method effectively solves the problem of low inventory precision when positioning is carried out by utilizing the phase signal 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 inventory, in particular to a mobile inventory system based on an RFID technology.
Background
With the rapid development of information-based construction, the checking requirements of people in the aspects of warehouse logistics, library, archive and materials and the like are developing towards the direction of controllable, refined and safe management, and how to adopt advanced and mature scientific and technical means on the basis of the existing management means becomes an important research subject for realizing the checking management safely, effectively and accurately.
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 widely applied to inventory positioning management of stored articles in industries such as warehouse logistics, book archives and data and the like. In RFID-based inventory management, an inventory mode that maintenance personnel hold an RFID reader is used conventionally, but the inventory mode has high work intensity, long time consumption and is easy to make mistakes.
In recent years, with the popularization of mobile robot technology, a scheme of automatically checking and positioning stored items by combining RFID technology and mobile robot technology has appeared. However, because the positioning accuracy of the RFID technology to the tag is related to power and distance, the tag of other storage units is easily read more by the high power, which causes inaccurate positioning, and the tag is not read easily by the low power or the long distance because of weak signal, which makes it difficult to accurately check and position the storage item. Although the label can be screened and positioned by using a method of curve fitting by using the radio frequency phase of the label based on a high-power ultrahigh frequency RFID reader, the inventory positioning method by using a phase signal is more suitable for an ultrahigh frequency technology with more obvious phase signal change; in addition, in a scene where RFID signal reflection easily occurs, an inventory positioning error is easily caused due to a phase signal error; in the inventory of dense storage articles, the fitting distortion of subsequent positioning related curves is easily caused by a sparse sample set, and the inventory precision of the storage articles is reduced. Therefore, the current inventory positioning method is not suitable for most inventory application scenarios.
Disclosure of Invention
In view of the above disadvantages, the technical problem to be solved by the present invention is to provide a mobile checking system based on RFID technology, which includes a mobile platform, a statistical sorting module, a data processing module and an RFID scanning device; obtaining source segment data through RFID scanning equipment; positioning each storage unit through the mobile platform; carrying out statistical arrangement on multiple groups of data of the RFID tags through a statistical arrangement module to obtain statistical information of each RFID tag; performing weighting operation on the statistical information through a data processing module, and positioning the article corresponding to the RFID label to a storage unit with the highest operation score; searching lost articles through the data processing module by comparing the database; sequencing all articles in the storage unit; and finally, comparing the database to find out the article with the wrong placement. The method and the device have the advantages that the multi-read objects are eliminated while the rate of missed reading is reduced, the checking precision is guaranteed, the problem of low checking precision when positioning is carried out by utilizing phase signals in the prior art is effectively solved, and the method and the device are 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 mobile checking system based on RFID technology comprises a mobile platform, a statistical sorting module, a data processing module and RFID scanning equipment;
the mobile platform is used for carrying an RFID scanning device to scan an RFID label attached to each article in a storage device, the storage device comprises K storage units, and K is a positive integer; the RFID system is also used for positioning each storage unit 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 ID number of an electronic tag, a signal strength value RSSI when the signal of the RFID tag is detected, and a Distance between an antenna and the RFID tag when the signal of the RFID tag is detected; multiple sets of data may be collected for each RFID tag;
the statistical sorting module is used for performing statistical sorting on multiple groups of data of the RFID tags in the source segment data of each storage unit to obtain statistical information of each RFID tag in the source segment data, wherein the statistical information at least comprises one of MaxRSSI, averageRecipralcommum, positionRssi and positionPhase; the statistical information is also used for sending to a data processing module;
wherein:
the MaxRSSI is the maximum RSSI value in the same RFID tag data;
averageRecipralcaSum is the average value of the sum of reciprocal distances between the antenna and the RFID tag;
the positionRssi is an RSSI value corresponding to a peak of a curve obtained by performing distance-RSSI quadratic curve fitting on RSSI values in the same RFID tag information in the storage unit, that is, the highest point; distance is the movement distance of the RFID antenna fed back by the mobile platform;
the position Phase is a Phase value corresponding to a peak of a curve obtained by performing distance-Phase quadratic curve fitting on Phase values in the same RFID tag information in the storage unit, namely the highest point;
the data processing module is used for carrying out weighting operation on the statistical information and calculating the value of the RFID label; the RFID label mapping method is characterized by further comprising the steps of selecting a storage unit with the highest RFID label score for RFID labels with the same ID number, and obtaining a mapping set after the RFID labels are positioned, wherein the mapping relation is < StoreUnit, StoreGoodsInfo set >, and the StoreGoodsInfo is the information of articles in the storage unit and comprises the ID number;
the data processing module is also used for comparing ID numbers in a pre-stored background database according to the ID numbers in the article information in the storage unit and finding out lost storage articles;
the data processing module is also used for sequencing the positioned articles in each storage unit to obtain the relative position sequence of the articles;
the data processing module is also used for comparing the information of the stored articles in the pre-stored background database and judging the articles placed in the wrong 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 comprises the following steps:
recording the time when the antenna enters the storage device through the starting point position of the storage device fed back by the mobile platform moving at a constant speed, namely the StartTime of the opening time of the reader; presetting the width of a storage unit as W and the speed of a mobile platform as V; the mobile platform keeps a fixed distance from the storage device all the time in the motion process;
the time intervals are distinguished: the time consumed by 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) ];
and 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 detected RFID tag signal in the source data, and obtaining the RFID source segment data in each storage unit.
Preferably, the averageReciprocalSum is obtained by calculation according to formulas (1) to (3):
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 distance between the antenna and the RFID tag when the ith group of data of the same RFID tag is acquired, RecipralcalSum is the sum of the reciprocal distances 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, K1、K2、K3、K4Is a preset weight coefficient, K is more than or equal to 01，K2，K3，K41 or less, at least one is not 0 and K1+K2+K3+K4=1。
Preferably, the sorting of the items inside each storage unit that has been located includes the steps of:
for each storage unit, acquiring statistical information of RFID tags with the same ID number in the storage unit for each ID number information in the storage unit internal article information StoreGoodsInfo;
and acquiring a distance value corresponding to the position Rssi or position phase of each ID number, sequencing the distance values from small to large to obtain corresponding OrderNum, and acquiring the information of the articles in the storage unit with sequence numbers, wherein the sequence numbers are 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 a maximum RSSI value MaxRSSI;
the sorting of the items inside each storage unit which has been positioned comprises the following steps:
and obtaining MaxTime in the article information in each storage unit, sequencing the MaxTime from small to large to obtain corresponding OrderNum, and obtaining the article information in the storage unit with sequence numbers, wherein the sequence numbers correspond to the position sequence of each article in the storage unit.
Preferably, the RFID tag data rsinfo further includes a time FirstSeenTime at which the RFID tag signal is detected;
the sorting of the items inside each storage unit which has been positioned comprises the following steps:
for each storage unit, acquiring all RFID tag data sets with the same ID number in source segment data according to ID number information in article information in the storage unit, and recording a minimum FirstSeenTime value corresponding to each ID number;
and sequencing the minimum FirstSeenTime value from small to large to obtain corresponding OrderNum, and obtaining the information of the articles in the storage unit with sequence numbers, wherein the sequence numbers correspond to the position sequence of each article in the storage unit.
Compared with the prior art, the invention provides a mobile checking system based on the RFID technology, which comprises a mobile platform, a statistical sorting module, a data processing module and RFID scanning equipment, wherein the mobile platform is connected with the data processing module through a communication network; obtaining source segment data through RFID scanning equipment; positioning each storage unit through the mobile platform; carrying out statistical arrangement on multiple groups of data of the RFID tags through a statistical arrangement module to obtain statistical information of each RFID tag; performing weighting operation on the statistical information through a data processing module, and positioning the article corresponding to the RFID label to a storage unit with the highest operation score; searching lost articles through the data processing module by comparing the database; sequencing all articles in the storage unit; and finally, comparing the database to find out the article with the wrong placement. The method and the device have the advantages that the multi-read objects are eliminated while the rate of missed reading is reduced, the checking precision is guaranteed, the problem of low checking precision when positioning is carried out by utilizing phase signals in the prior art is effectively solved, and the method and the device are 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 the main functions of a mobile inventory system based on RFID technology;
fig. 2 is a block diagram of a mobile inventory system based on RFID technology.
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 mobile checking system based on RFID technology, as shown in fig. 1 and fig. 2, the checking system comprises a mobile platform, a statistical sorting module, a data processing module and RFID scanning equipment;
the mobile platform is used for carrying an RFID scanning device to scan an RFID label attached to each article in a storage device, the storage device comprises K storage units, and K is a positive integer; and also for locating each storage unit and obtaining RFID source segment data within 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 ID number of an electronic tag, a signal strength value RSSI when the signal of the RFID tag is detected, and a Distance between an antenna and the RFID tag when the signal of the RFID tag 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 within the storage unit by the mobile platform comprises the following steps:
recording the time when the antenna enters the storage device through the starting point position of the storage device fed back by the mobile platform moving at a constant speed, namely the StartTime of the opening time of the reader; presetting the width of a storage unit as W and the speed of a mobile platform as V; the mobile platform keeps a fixed distance from the storage device all the time in the motion process;
the time intervals are distinguished: the time consumed by 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) ];
and 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 detected RFID tag signal in the source data, and obtaining the RFID source segment data in each storage unit.
The statistical sorting module is used for performing statistical sorting on multiple groups of data of the RFID tags in the source segment data of each storage unit to obtain statistical information of each RFID tag in the source segment data, wherein the statistical information at least comprises one of MaxRSSI, averageRecipralcommum, positionRssi and positionPhase; and the statistical information is also sent to a data processing module.
Wherein:
the MaxRSSI is the maximum RSSI value in the same RFID tag data;
averageRecipralcaSum is the average value of the sum of reciprocal distances between the antenna and the RFID tag;
the positionRssi is an RSSI value corresponding to a peak of a curve obtained by performing distance-RSSI quadratic curve fitting on RSSI values in the same RFID tag information in the storage unit, that is, the highest point; distance is the movement distance of the RFID antenna fed back by the mobile platform;
the positionPhase is a Phase value corresponding to the peak of a curve obtained by performing distance-Phase quadratic curve fitting on Phase values in the same RFID tag information in the storage unit, namely the highest point.
The averageRecipralcalsum is obtained by calculation according to formulas (1) to (3):
ReciprocalSum=
i=1，2，…，n（2）
average
（3）
wherein: a is the distance between the antenna and the RFID tagRSSI value at 1 meter, N is the environmental attenuation factor,
in order to acquire the distance between the antenna and the RFID tag when the ith group of data of the same RFID tag is acquired, RecipralcalSum is the sum of the reciprocal distances between the antenna of n groups of data and the RFID tag.
In one implementation, the statistically collating 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 the source segment data, and entering the step b;
b. traversing each RFID label data in all the source segment data, and entering the step c;
c. d, judging whether the current ID number appears or not, and if not, entering the step d; if yes, entering step e;
d. record of the ID number is added:
ShowTime=1，
SumRSSI=RSSI，
ReciprocalSum=1/Distance；
entering step g;
e. updating the record of the ID number:
the updated ShowTime value is ShowTime +1,
update the SumRSSI value to SumRSSI + RSSI,
update ReciprocalSum value = ReciprocalSum + 1/Distance;
entering step f;
f. judging whether the current RSSI value is larger than the MaxRSSI value, if so, entering the step g; if not, entering the step h;
g. updating MaxRSSI = current RSSI value, MaxTime = FirstSeenTime, and entering step h;
h. judging whether all RFID tags are traversed or not, if so, entering a step i, and if not, entering a step b;
i. judging whether all source segment data are traversed or not, if so, entering a step j, and if not, entering a step a;
j. and obtaining the data of the processed section.
The mapping relation of the processed segment data is as follows: the system comprises a StoreUnit, a HandledRssinfo set and a detection time MaxTime, wherein the HandledRssinfo set comprises electronic tag ID numbers, showTime corresponding to each ID number, sum of RSSI values SumRSSI in the same RFID tag data, average value averageRecirculation Sum of distance reciprocal sum, maximum RSSI value MaxRSSI in the same RFID tag data and detection time MaxTime corresponding to the maximum RSSI value.
The data processing module is used for carrying out weighting operation on the statistical information and calculating the value of the RFID label; and the method is also used for selecting the storage unit with the highest RFID tag score for the RFID tags with the same ID numbers, and obtaining the mapping set after the RFID tags are positioned, wherein the mapping relation is < StoreUnit, StoreGoodsInfo set >, and the StoreGoodsInfo is the information of the items in the storage unit and comprises the ID numbers.
In one implementation manner, the sending the statistical information to a data processing module for performing a weighting operation to calculate the score of the RFID tag includes the following steps:
a. traversing all the processed segment data, and entering the step b;
b. traversing each RFID label information in all the processed data and a storage unit in the article positioning information, and entering the step c;
c. judging whether the ID number is positioned to a certain storeUnit or not, and if not, entering the step d; if yes, entering step e;
d. adding the current article positioning information < ID number, LocatedInfo set >;
e. performing weighted operation on the statistical information according to a formula (4), respectively recording point values, judging whether the current point value is larger than the positioned point value, if so, entering a step f, and if not, entering a step g;
point=K1*MaxRSSI+K2*averageReciprocalSum+K3*positionRssi+K4*positionPhase （4）
wherein, K1、K2、K3、K4Is a preset weight coefficient, K is more than or equal to 01，K2，K3，K41 or less, at least one is not 0 and K1+K2+K3+K4=1；
f. Updating the article positioning information < ID number, LocatedInfo set >, and entering the step g;
g. judging whether all RFID label information is traversed or not, if so, entering the step h, and if not, entering the step b;
h. judging whether all the processed section data are traversed or not, if so, entering the step i, and if not, entering the step a;
i. all article location information is obtained.
The mapping relationship of the item positioning information is < ID number, LocatedInfo set >, which indicates that the ID number is positioned in the storage unit, wherein the positioning information LocatedInfo comprises the storage unit, ShowTime, SumRSSI, Distance, averageRecypalcommum, MaxRSSI and MaxTime.
In this step, K can be adjusted according to different environments1、K2、K3、K4Is set, e.g., in the present embodiment, K1=0.6，K2=0.2，K3=0.1，K4=0.1。
The data processing module is also used for comparing ID numbers in a background database stored in advance according to the ID numbers in the article information in the storage unit, and finding out lost storage articles.
The data processing module is also used for sequencing the positioned articles in each storage unit to obtain the relative position sequence among the articles.
In one implementation, the sorting the items inside each storage unit that has been located includes the following steps:
for each storage unit, acquiring statistical information of RFID tags with the same ID number in the storage unit for each ID number information in the storage unit internal article information StoreGoodsInfo;
and acquiring a distance value corresponding to the position Rssi or position phase of each ID number, sequencing the distance values from small to large to obtain corresponding OrderNum, and acquiring the information of the articles in the storage unit with sequence numbers, wherein the sequence numbers are the position sequence of each article in the storage unit.
In another implementation manner, the storage unit internal article information StoreGoodsInfo further includes a detected time MaxTime corresponding to a maximum RSSI value MaxRSSI;
the sorting of the items inside each storage unit which has been positioned comprises the following steps:
and obtaining MaxTime in the article information in each storage unit, sequencing the MaxTime from small to large to obtain corresponding OrderNum, and obtaining the article information in the storage unit with sequence numbers, wherein the sequence numbers correspond to the position sequence of each article in the storage unit.
In another implementation, the RFID tag data rsinfo further includes a time FirstSeenTime at which the RFID tag signal was detected;
the sorting of the items inside each storage unit which has been positioned comprises the following steps:
for each storage unit, acquiring all RFID tag data sets with the same ID number in source segment data according to ID number information in article information in the storage unit, and recording a minimum FirstSeenTime value corresponding to each ID number;
and sequencing the minimum FirstSeenTime value from small to large to obtain corresponding OrderNum, and obtaining the information of the articles in the storage unit with sequence numbers, wherein the sequence numbers correspond to the position sequence of each article in the storage unit.
The data processing module is also used for comparing the information of the stored articles in the pre-stored background database and judging the articles placed in the wrong storage unit.
The mobile platform includes a navigation module for locating a start position and an end 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 checking system based on the RFID technology, which comprises a mobile platform, a statistical sorting module, a data processing module and RFID scanning equipment, wherein the mobile platform is connected with the data processing module through a communication network; obtaining source segment data through RFID scanning equipment; positioning each storage unit through the mobile platform; carrying out statistical arrangement on multiple groups of data of the RFID tags through a statistical arrangement module to obtain statistical information of each RFID tag; performing weighting operation on the statistical information through a data processing module, and positioning the article corresponding to the RFID label to a storage unit with the highest operation score; searching lost articles through the data processing module by comparing the database; sequencing all articles in the storage unit; and finally, comparing the database to find out the article with the wrong placement. The method and the device have the advantages that the multi-read objects are eliminated while the rate of missed reading is reduced, the checking precision is guaranteed, the problem of low checking precision when positioning is carried out by utilizing phase signals in the prior art is effectively solved, and the method and the device are suitable for high-frequency and ultrahigh-frequency RFID technologies and wide in application range.
The present invention provides a mobile checking system based on RFID technology, and a number of methods and ways for implementing the technical solution are provided, and the above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a number of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention. All the components not specified in the present embodiment can be realized by the prior art.
Claims (9)
1. A mobile checking system based on RFID technology is characterized by comprising a mobile platform, a statistical sorting module, a data processing module and RFID scanning equipment;
the mobile platform is used for carrying an RFID scanning device to scan an RFID label attached to each article in a storage device, the storage device comprises K storage units, and K is a positive integer; the RFID system is also used for positioning each storage unit 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 ID number of an electronic tag, a signal strength value RSSI when the signal of the RFID tag is detected, and a Distance between an antenna and the RFID tag when the signal of the RFID tag is detected; multiple sets of data may be collected for each RFID tag;
the statistical sorting module is used for performing statistical sorting on multiple groups of data of the RFID tags in the source segment data of each storage unit to obtain statistical information of each RFID tag in the source segment data, wherein the statistical information at least comprises one of MaxRSSI, averageRecipralcommum, positionRssi and positionPhase; the statistical information is also used for sending to a data processing module;
wherein:
the MaxRSSI is the maximum RSSI value in the same RFID tag data;
averageRecipralcaSum is the average value of the sum of reciprocal distances between the antenna and the RFID tag;
the positionRssi is an RSSI value corresponding to a peak of a curve obtained by performing distance-RSSI quadratic curve fitting on RSSI values in the same RFID tag information in the storage unit, that is, the highest point; distance is the movement distance of the RFID antenna fed back by the mobile platform;
the position Phase is a Phase value corresponding to a peak of a curve obtained by performing distance-Phase quadratic curve fitting on Phase values in the same RFID tag information in the storage unit, namely the highest point;
the data processing module is used for carrying out weighting operation on the statistical information and calculating the value of the RFID label; the RFID label mapping method is characterized by further comprising the steps of selecting a storage unit with the highest RFID label score for RFID labels with the same ID number, and obtaining a mapping set after the RFID labels are positioned, wherein the mapping relation is < StoreUnit, StoreGoodsInfo set >, and the StoreGoodsInfo is the information of articles in the storage unit and comprises the ID number;
the data processing module is also used for comparing ID numbers in a pre-stored background database according to the ID numbers in the article information in the storage unit and finding out lost storage articles;
the data processing module is also used for sequencing the positioned articles in each storage unit to obtain the relative position sequence of the articles;
the data processing module is also used for comparing the information of the stored articles in the pre-stored background database and judging the articles placed in the wrong storage unit.
2. The RFID-based mobile inventory system of claim 1, wherein the mobile platform includes a navigation module for locating the start and end locations of each storage unit.
3. The RFID-based mobile inventory system of claim 1, wherein the mobile platform moves in a direction parallel to the storage unit.
4. The RFID-based mobile inventory system of claim 1, wherein the step of locating each storage unit and obtaining the RFID source segment data in the storage unit comprises the steps of:
recording the time when the antenna enters the storage device through the starting point position of the storage device fed back by the mobile platform moving at a constant speed, namely the StartTime of the opening time of the reader; presetting the width of a storage unit as W and the speed of a mobile platform as V;
the time intervals are distinguished: the time consumed by 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) ];
and 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 detected RFID tag signal in the source data, and obtaining the RFID source segment data in each storage unit.
5. The RFID-based mobile inventory system of claim 1, wherein the averageRecipralcalcum is obtained by calculation according to formulas (1) - (3):
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 distance between the antenna and the RFID tag when the ith group of data of the same RFID tag is acquired, RecipralcalSum is the sum of the reciprocal distances between the antenna of n groups of data and the RFID tag.
6. The RFID-based mobile inventory system of claim 5, wherein the statistical information is weighted according to formula (4):
point=K1*MaxRSSI+K2*averageReciprocalSum+K3*positionRssi+K4*positionPhase （4）
wherein, K1、K2、K3、K4Is a preset weight coefficient, K is more than or equal to 01，K2，K3，K41 or less, at least one is not 0 and K1+K2+K3+K4=1。
7. The RFID-based mobile inventory system of claim 1, wherein the ordering of the items within each storage unit that have been located comprises the steps of:
for each storage unit, acquiring statistical information of RFID tags with the same ID number in the storage unit for each ID number information in the storage unit internal article information StoreGoodsInfo;
and acquiring a distance value corresponding to the position Rssi or position phase of each ID number, sequencing the distance values from small to large to obtain corresponding OrderNum, and acquiring the information of the articles in the storage unit with sequence numbers, wherein the sequence numbers are the position sequence of each article in the storage unit.
8. The mobile inventory system based on RFID technology as claimed in claim 1, wherein the storage unit internal item information StoreGoodsInfo further includes a detected time MaxTime corresponding to a maximum RSSI value maxrssif;
the sorting of the items inside each storage unit which has been positioned comprises the following steps:
and obtaining MaxTime in the article information in each storage unit, sequencing the MaxTime from small to large to obtain corresponding OrderNum, and obtaining the article information in the storage unit with sequence numbers, wherein the sequence numbers correspond to the position sequence of each article in the storage unit.
9. The mobile inventory system based on RFID technology as claimed in claim 1, wherein the RFID tag data rsinfo further includes a time FirstSeenTime at which the RFID tag signal is detected;
the sorting of the items inside each storage unit which has been positioned comprises the following steps:
for each storage unit, acquiring all RFID tag data sets with the same ID number in source segment data according to ID number information in article information in the storage unit, and recording a minimum FirstSeenTime value corresponding to each ID number;
and sequencing the minimum FirstSeenTime value from small to large to obtain corresponding OrderNum, and obtaining the information of the articles in the storage unit with sequence numbers, wherein the sequence numbers correspond to the position sequence of each article in the storage unit.
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