WO2017128957A1 - 一种基于rfid标签rssi信号值的图书排序方法 - Google Patents

一种基于rfid标签rssi信号值的图书排序方法 Download PDF

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WO2017128957A1
WO2017128957A1 PCT/CN2017/070929 CN2017070929W WO2017128957A1 WO 2017128957 A1 WO2017128957 A1 WO 2017128957A1 CN 2017070929 W CN2017070929 W CN 2017070929W WO 2017128957 A1 WO2017128957 A1 WO 2017128957A1
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book
rfid tag
rssi
time
rfid
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French (fr)
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陈力军
罗园洁
刘佳
万凌昊
陈曦
曾阿凡
李颖
施庆朴
黄嘉琪
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Nanjing University
Nanjing Tech University
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Nanjing University
Nanjing Tech University
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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10366—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • 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
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00—Administration; Management
    • G06Q10/08—Logistics, e.g. warehousing, loading or distribution; Inventory or stock management
    • G06Q10/087—Inventory or stock management, e.g. order filling, procurement or balancing against orders
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • 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
    • G06K17/0003—Automatic card files incorporating selecting, conveying and possibly reading and/or writing operations
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves

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  • the invention relates to the field of RFID technology, in particular to a book sorting method based on an RSS tag RSSI signal value.
  • RFID Radio Frequency Identification
  • RFID technology is a non-contact automatic identification technology that automatically recognizes target objects and acquires data through radio frequency signals without manual intervention.
  • the RFID technology has the advantages of waterproof, anti-magnetic, high temperature resistance, large reading distance, and data encryption that the barcode does not have.
  • RFID technology is gradually being applied to all aspects of industrial production and daily life, and has made considerable progress in the fields of factory production, railway operation, warehousing and logistics, valuable trade, and identification.
  • the existing barcode has the following disadvantages: 1.
  • the barcode is "visual technology", the scanner must be operated manually, and can only receive barcode barcodes within its field of view; 2. Barcode The data cannot be changed; 3. The barcode has higher requirements for integrity; 4. The barcode can only identify the producer and the product, and cannot identify the specific product; 5. Although the barcode only stores a small amount of data, the data is not Encoded, the identification code is universal, so there is still some lack of data confidentiality and security. All of these problems, radio frequency identification (RFID) technology can be solved one by one, bringing great convenience to library management. At present, the library has not used the RSSI signal of the RFID tag for the sorting of books, and it is easier to use the RSSI signal than to sort the books by using the phase value of the tag.
  • RFID radio frequency identification
  • the technical problem to be solved by the present invention is to provide a book sorting method based on the RFID tag RSSI signal value, and to use the RSSI value in the RFID technology to automatically identify the order of each layer of books in the library.
  • the present invention discloses a book sorting method based on an RSSI-based RSSI (Received Signal Strength Indication received signal strength indication) signal value, including: performing a book based on a change rule of an RFID tag RSSI value with time.
  • RSSI-based RSSI Receiveived Signal Strength Indication received signal strength indication
  • Step 1 The RFID device is used to read the information of the RFID tag of the book in the book.
  • the information of the RFID tag of the book includes: an EPC (Electronic Product Code) number of the RFID tag of the book, an RSSI value of the RFID tag of the book, and reading The time t of the RFID tag of the book will correspond to the above three of a book
  • the attribute values are marked as one record;
  • Step 2 classify books having the same book RFID tag EPC number into one class, obtain a graph of the RSSI value of the RFID tag of the book according to the time t, and preprocess the graph;
  • Step 3 further processing the curve obtained in step 2, obtaining the RSSI value of the RFID tag of the book according to the change rule of time, and establishing a quadratic curve model;
  • step 4 the order of the RFID tags of each book is obtained according to the model, so that the books are sorted.
  • step 1 the distance d between the RFID device and the book and the RSSI value of the book RFID tag have the following relationship:
  • abs() represents the absolute value function
  • A is the RSSI value of the RFID tag of the book when the distance between the RFID device and the book is 1 meter
  • n is the environmental attenuation factor.
  • step 2 includes the following steps:
  • Step 2-1 the book RFID tag obtained in step 1 is divided according to the book RFID tag EPC number, and the book RFID tag with the same EPC number is divided into one class, and the book RFID tag representing a book is returned at different times t. RSSI value;
  • Step 2-2 in each of the divided classes, sort the RSSI values of the RFID tags of each type of books according to the time t, and obtain a graph of the RSSI value of the RFID tags as a function of time t;
  • Step 2-3 the RSSI value of the RFID tag of the book changes with time t to form a curve, find the highest peak in the graph, retain a continuous curve with the highest peak, and other scatter points or a segment with a peak but not the highest peak. Curve culling.
  • step 3 includes:
  • a quadratic curve fitting is performed on the curve retained in step 2, and the peak of the peak of the fitted curve, that is, the highest point T, is obtained.
  • step 4 includes:
  • the time T of all the RFID tags of the books obtained in step 3 is sorted from small to large, and the obtained time is smooth.
  • the order corresponds to the order of each book on the shelf.
  • the present invention uses the RSSI value for library book sorting, so that the specific position order of each book on a shelf can be obtained, so that the librarian and the reader can quickly find the book.
  • Figure 1 is a diagram showing the positional relationship between an antenna and a bookshelf.
  • Figure 2 is a graph of RSSI values as a function of time.
  • Figure 3 is a flow chart of an embodiment.
  • RFID technology consists of three parts: an antenna, a reader, and an RFID tag.
  • the RF signal emitted by the antenna is reflected back by the tag after reaching the RFID tag, and the reader identifies the RFID tag by the received reflected signal, wherein the reflected signal includes the RSSI signal.
  • the RSSI signal value reflected by the tag is used to realize the book sorting of the library. The distance is related to the RSSI signal as follows:
  • RSSI is the received signal strength (negative value)
  • A is the signal strength when the transmitting end and the receiving end are separated by 1 meter
  • the optimal range is 45-49
  • n is the environmental attenuation factor, generally takes 2 ⁇ 5. It can be converted from the above formula:
  • the antennas When sorting a layer of books in the library bookshelf, the antennas should be placed in parallel at a distance from the book. Otherwise, the RSSI signal value will not change greatly with time for a book.
  • the antenna distance The distance of the book is set to 10cm. During the process of scanning the book, the antenna is slowly moved from one side of the bookshelf to the other side of the bookshelf at a uniform speed, as shown in FIG.
  • the RSSI signal value changes with time as shown in Figure 2, and the abscissa indicates the reading target.
  • the time of signing, the ordinate indicates the value of the RSSI signal returned by the tag.
  • the RSSI value is incremented; from near to far, the RSSI value is decremented;
  • This embodiment provides a book sorting method based on the RFID tag RSSI signal value, wherein the data collecting process is as follows:
  • the EPC number of the tag includes the id number of the book.
  • the id number is extracted from the EPC number.
  • the background database server is queried according to the id number, and the related book information can be queried.
  • the collected information includes the EPC number of the RFID tag of the book, the RSSI signal value r reflected by the tag, and the time t at which the tag signal is acquired.
  • the above three attribute values corresponding to a book at one time are marked as one record, and the collected data should include records of all books of the bookshelf at different times, and all the records are saved to the background database for subsequent analysis.
  • the data records from the background are classified according to the label EPC number, and the records with the same EPC number are one class, representing the information of a book.
  • the RSSI values of each record are sorted in chronological order, and a graph of the RSSI value of the RFID tag as a function of time can be obtained.
  • the RSSI value corresponding to each book may deviate from the curve at some time, and some discrete points or small waves appear, so these sparse points should be processed first. As the RSSI value increases with time, its value increases first, and then reaches a maximum point and then decrements. Find the highest peak in the graph, retain a continuous curve with the highest peak, and remove other scatters or a curve with peaks but not the highest peaks;
  • the RSS book sorting process based on the RSSI value of this embodiment is shown in FIG. 3.
  • 0 indicates that the type of the tag is a book RFID tag.
  • XXXXX indicates the book ID number, obtained from the barcode of the book
  • the 8-digit number starting from the 4th digit of the EPC number is extracted as the id number of the book, and the background database contains the information of the book and the bookshelf information of the book.
  • the id number can be used to query the book information in the background database.
  • the books on the library shelves should be neatly discharged, and the staggered placement of the books may affect the sorting effect.
  • the antenna can't be too far away from the book. Otherwise, the value of the RSSI signal returned by a book will not be much different during the process of moving, because there is no big change in the distance of the antenna relative to the book within a certain range.
  • the speed of movement should not be too fast, the moving speed is fast, and the number of times the antenna reads the label is reduced. In this embodiment, the speed is controlled to be about 0.1 m/s.
  • the acquired data includes the EPC number of the book RFID tag, the RSSI signal value returned by the tag, and the time t at which the tag is read. Save the acquired data in a back-end database for subsequent processing.
  • the sorting of books can be sorted while scanning the books, or it can be sorted after scanning the books on the first floor of the bookshelf, and then processed according to actual needs.
  • the first type is adopted, and the books are sorted while scanning the book. After scanning some books on the first floor of the bookshelf, the data of the corresponding books is extracted from the background database for processing, the books are sorted, the results obtained this time are saved to the back of the previous result, and then the data in the database is deleted.
  • the data obtained is the data of multiple books interlaced together, the data needs to be extracted and classified, and the same EPC will be available.
  • the numbers of the numbers are grouped together to represent the RSSI values returned by the RSSI tags of a book at different times.
  • the data of the well-classed data is obtained in chronological order to obtain the RSSI value.
  • the graph obtained in the above steps will have discrete points, or some small peaks will appear. These are the interference factors for the subsequent steps, which need to be carried out. Eliminate, leaving only a continuous curve with the highest value.
  • the pre-processed curve is not the best model for analysis. It is necessary to perform quadratic curve fitting on the curve to obtain a complete band that increases first and then decreases with time.
  • the time at which the maximum value is taken is T. .
  • the obtained T 1 , T 2 , T 3 ... Tn are sorted in ascending order, which is the order of the books in which the tags are located.
  • the present invention provides a book sorting method based on the RFID tag RSSI signal value.
  • the above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art will It is to be understood that a number of modifications and refinements may be made without departing from the principles of the invention, and such modifications and refinements are also considered to be within the scope of the invention.
  • the components that are not clear in this embodiment can be implemented by the prior art.

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Abstract

一种基于RFID标签RSSI信号值的图书排序方法，包括如下步骤：使用RFID设备读取图书内的图书RFID标签，标签信号包括：图书RFID标签EPC号EPC，图书RFID标签的RSSI值r，读取到的图书RFID标签的时间t，将一个时间对应一本图书的上述三个属性值标记为一个记录；将有相同标签EPC号的记录归为一类，按照时间顺序画出这一类标签RSSI值的曲线图，并对曲线图进行预处理；对曲线进一步处理，获取图书RFID标签RSSI值根据时间的变化规律，建立模型；根据模型得到每个图书RFID标签的位置顺序，以此对图书进行排序。该方法利用RFID标签信号的RSSI信号用于图书排序，准确定位出每本图书在一层书架的位置顺序，方便了图书馆管理人员和读者查找图书。

Description

一种基于RFID标签RSSI信号值的图书排序方法 技术领域
本发明涉及一种RFID技术领域，特别是一种基于RFID标签RSSI信号值的图书排序方法。
背景技术
RFID(Radio Frequency Identification，射频识别)是一种非接触式的自动识别技术，它通过射频信号自动识别目标对象并获取数据，不需要人工干预。作为条形码的无线版本，RFID技术具有条形码不具备的防水、防磁、耐高温、读取距离大、数据可以加密等优点。RFID技术目前被逐步地应用于工业生产和日常生活的各个方面，在工厂生产、铁路运营、仓储物流、贵重品贸易、身份识别等领域得到了长足发展，。
目前，绝大多数图书馆仍然使用条形码系统，现有的条形码具有以下缺点：1.条形码是″可视技术″，扫描器必须人为操作，只能接收它视野范围内的条码条形码；2.条形码的数据不能更改；3.条形码对完整性有较高要求；4.条形码只能识别生产者和产品，并不能辨认具体的商品；5.条形码虽然只存储了少量数据，但这些数据却是未经过编码的，识别码是全球通用，因此数据保密性和安全性还是有一些欠缺。以上种种的这些问题，无线射频识别(RFID)技术可以一一解决，为图书馆图书管理带来了极大的便利。目前图书馆还没有将RFID标签的RSSI信号用于图书的排序，相对于利用标签的相位值对图书进行排序，采用RSSI信号更为简便。
发明内容
发明目的：本发明所要解决的技术问题是针对现有技术的不足，提供基于RFID标签RSSI信号值的图书排序方法，利用RFID技术中的RSSI值来自动识别图书馆中每一层图书排列顺序。
为了解决上述技术问题，本发明公开了一种基于RFID标签的RSSI(Received Signal Strength Indication接收的信号强度指示)信号值的图书排序方法，包括：基于RFID标签RSSI值随时间的变化规律对图书进行排序的方法，具体步骤如下：
步骤1，使用RFID设备读取图书内的图书RFID标签的信息，图书RFID标签的信息包括：图书RFID标签的EPC(Electronic Product Code，产品电子代码)号，图书RFID标签的RSSI值r，读取到的图书RFID标签的时间t，将对应一本图书的上述三 个属性值标记为一个记录；
步骤2，将具有相同图书RFID标签EPC号的图书归为一类，按照时间t的顺序得到这一类图书RFID标签RSSI值的曲线图，并对曲线图进行预处理；
步骤3，对步骤2得到的曲线进一步处理，获取图书RFID标签的RSSI值根据时间的变化规律，建立二次曲线模型；
步骤4，根据模型得到每个图书RFID标签的位置顺序，以此对图书进行排序。
步骤1中，RFID设备与图书之间的距离d和图书RFID标签的RSSI值具有如下式所示的关系：
d＝10^((abs(RSSI)-A)/(10*n))，
其中，abs()表示绝对值函数，A为RFID设备与图书之间的距离为1米时图书RFID标签的RSSI值，n为环境衰减因子，由上述公式得到如下公式：
RSSI＝-log(10*n*d+A)，
上述公式表明，RFID设备与图书之间的距离越远，图书RFID标签的RSSI值越小。
其中，步骤2包括如下步骤：
步骤2-1，将步骤1获得的图书RFID标签根据图书RFID标签EPC号进行划分，将有相同EPC号的图书RFID标签划分为一类，代表一本图书的图书RFID标签在不同时间t返回的RSSI值；
步骤2-2，在每个划分好的类中，按照时间t的顺序对每一类图书RFID标签的RSSI值排序，得到一个RFID标签RSSI值随时间t变化的曲线图；
步骤2-3，图书RFID标签的RSSI值随着时间t变化形成曲线，找出曲线图中的最高波峰，保留拥有最高波峰的一段连续曲线，将其他散点或者拥有波峰但非最高波峰的一段曲线剔除。
其中，步骤3包括：
对步骤2中保留的曲线进行二次曲线拟合，得出拟合后的曲线的波峰即最高点所在的时间T。
其中，步骤4包括：
对步骤3得到的所有图书RFID标签的时间T从小到大进行排序，得出的时间顺 序即对应每本图书在书架上的位置顺序。
本发明首次将RSSI值用于图书馆图书排序，从而可以得到每本图书在一层书架上的具体位置顺序，使得图书管理员和读者可以快速查找到图书。
有益效果：通过本方法实现了对书架每层的图书排序的目的，可以准确的定位出每一本书的位置顺序，提高了图书馆典藏的精度。
附图说明
下面结合附图和具体实施方式对本发明做更进一步的具体说明，本发明的上述和/或其他方面的优点将会变得更加清楚。
图1是天线与书架的位置关系图。
图2是RSSI值随时间变化图。
图3是实施例的流程图。
具体实施方式
实施例1
RFID技术由三部分组成：天线，阅读器和RFID标签。天线发射出的射频信号在到达RFID标签后会被标签反射回来，阅读器通过接收到的反射信号识别RFID标签，其中，反射的信号包括RSSI信号。本实施例利用标签反射的RSSI信号值实现图书馆的图书排序。距离与RSSI信号值得关系如下：
d＝10^((abs(RSSI)-A)/(10*n))，
其中，d为计算所得距离，RSSI为接收信号强度(负值)，A为发射端和接收端相隔1米时的信号强度，最佳范围为45-49，n为环境衰减因子，一般取2～5。由上述公式可以转换得出：
RSSI＝-log(10*n*d+A)，
上述公式表明，距离d越大，RSSI值越小。
对图书馆书架的一层图书进行排序时，要将天线平行放置在距离图书不远的位置，否则RSSI信号值对于一本书来说随时间变化不会很大，在本实施例中天线距离图书的距离设置为10cm。在扫描图书的过程中，匀速地将天线从书架的一侧缓慢移动至书架的另一侧，俯视图如图1所示。
通过理论分析及实验，RSSI信号值随着时间变化规律如图2，横坐标表示读取标 签的时间，纵坐标表示标签返回的RSSI信号值。
通过图2可以得出以下结论：
当天线距离RFID标签由远到近时，RSSI值递增；由近及远时，RSSI值递减；
本实施例提供了基于RFID标签RSSI信号值的图书排序方法，其中数据采集的过程如下：
1、在每本图书中都放入一个RFID标签，标签的EPC号包括图书的id号，从EPC号中提取此id号，根据id号查询后台数据库服务器，可以查询相关图书信息。
2、将天线从书架的一端平行于图书缓慢移动至书架的另一端，天线距离图书的距离保持10cm。
3、采集到的信息包括图书RFID标签的EPC号，标签反射的RSSI信号值r和采集到标签信号的时间t。将一个时间对应一本图书的上述三个属性值标记为一个记录，采集到的数据应该包含该层书架所有图书在不同时间的记录，将所有记录保存至后台数据库，以供后续分析。
采集到数据后，可以对图书进行排序，具体过程如下：
1、从后台数据记录根据标签EPC号划分类，EPC号相同的记录为一类，代表一本图书的信息。
2、在每个划分好的类中，按照时间顺序对每个记录的RSSI值排序，可以得到一个RFID标签RSSI值随时间变化的曲线图。
3、由于环境因素的影响，每本图书对应的RSSI值可能在某些时间会偏离曲线，出现一些离散的点或者小的波，所以要先对这些稀疏的点进行处理。对RSSI值随着时间的增加，其值先递增，到达一个最高点之后，再递减。找出曲线图中的最高波峰，保留拥有最高波峰的一段连续曲线，将其他散点或者拥有波峰但非最高波峰的一段曲线剔除；
4、某些图书比较薄，读到其里面RFID标签的次数比较少，导致上述预处理后的图上的点比较稀疏，所以需要对预处理好后的点进行二次曲线拟合。
5、从拟合好后的曲线找出最高点所对应的时间，每本图书都对应一个时间，将这些时间从小到大进行排序，得到的时间顺序就是对应图书在书架上的位置顺序。
本实施例的基于RSSI值的图书馆图书排序流程如图3所示。
1.将RFID标签放在图书中，并和后台数据库绑定
放置在图书中的标签EPC号的格式设置为：
0BCXXXXXXXX000000000
0：表示标签的类型为图书RFID标签
B：书的借出状态
0：表示未借出
1：表示借出
2：表示不准外借
C：表示长度，目前图书的编码长度为8
XXXXX：表示图书ID号，由图书的条形码获得
00000：因RFID编码要求，不足双字节需要进行补零操作；
在获取标签的EPC号之后，提取EPC号第4位开始的8位数字，作为图书的id号，后台数据库中包含图书的信息和图书所在的书架信息。从标签中提取出图书的id号以后，可以根据此id号到后台数据库进行图书信息的查询。
2.扫描图书，获取数据
图书馆书架上的图书应该整齐排放，书参差放置可能会影响排序的效果。整理好图书以后，将天线平行放置于距离图书10cm左右的位置。天线不能离图书太远，否则在移动的过程中，一本书返回的RSSI信号值不会有太大的区别，因为在一定范围内天线相对于图书的距离没有发生大的变化。移动的速度也不应该过快，移动速度快，天线读取标签的次数会减少，本实施例将速度控制在0.1m/s左右。
获取的数据包括图书RFID标签的EPC号，标签返回的RSSI信号值r和读取标签的时间t。将获取的数据保存在后台数据库中，以供后续的步骤处理。图书排序可以是边扫描图书边排序，也可以是扫描好书架一层的图书后再排序，根据实际需要处理。本实施例是采用第一种，边扫描图书边对图书进行排序。在扫描书架一层的部分图书后，从后台数据库提取相应图书的数据进行处理，对这几本图书进行排序，将本次得到的结果保存至上一次结果的后面，然后删除数据库中的数据。
3.对数据进行分类，画出RSSI值曲线图
获取的数据是多本书的数据交错在一起，需要将数据进行提取分类，将有相同EPC 号的数据归为一类，代表一本书的RSSI标签在不同时间返回的RSSI值。将分好类的数据分别按照时间顺序得到RSSI值的变化曲线图。
4.对数据进行预处理
由于环境因素的干扰，再加上书的厚薄程度不同，导致上述步骤得到的曲线图会有离散的点，或者会出现一些小的波峰，这些都是对后续步骤的干扰因子，需要将这些点进行剔除，只留下拥有最高值的一段连续曲线。
5.曲线拟合，图书排序
预处理好的曲线还不是能对其进行分析的最好模型，需要对曲线要进行二次曲线拟合，得到完整的随时间先递增，后递减的波段，取其最大值所在的时间为T。对得到的T1、T2、T3…Tn按照从小到大的顺序进行排序，这个顺序就是标签所在的图书的位置顺序。
本发明提供了基于RFID标签RSSI信号值的图书排序方法，具体实现该技术方案的方法和途径很多，以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。本实施例中未明确的各组成部分均可用现有技术加以实现。

Claims (5)

  1. 一种基于RFID标签RSSI信号值的图书排序方法，其特征在于，包括如下步骤：
    步骤1，使用RFID设备读取图书RFID标签的信息，图书RFID标签的信息包括：图书RFID标签的EPC号，图书RFID标签的RSSI值，读取到的图书RFID标签的时间t，将对应一本图书的上述三个属性值标记为一个记录<EPC号，RSSI值，时间t>；
    步骤2，将具有相同图书RFID标签EPC号的图书归为一类，按照时间t的顺序得到这一类图书RFID标签RSSI值的曲线图，并对曲线图进行预处理；
    步骤3，对步骤2得到的曲线进一步处理，获取图书RFID标签的RSSI值根据时间的变化规律，建立二次曲线模型；
    步骤4，根据模型得到每个图书RFID标签的位置顺序，以此对图书进行排序。
  2. 根据权利要求1所述的一种基于RFID标签RSSI信号值的图书排序方法，其特征在于，步骤1中，RFID设备与图书之间的距离d和图书RFID标签的RSSI值具有如下式所示的关系：
    d＝10^((abs(RSSI)-A)/(10*n))，
    其中，abs()表示绝对值函数，A为RFID设备与图书之间的距离为1米时图书RFID标签的RSSI值，n为环境衰减因子，由上述公式得到如下公式：
    RSSI＝-log(10*n*d+A)，
    上述公式表明，RFID设备与图书之间的距离越远，图书RFID标签的RSSI值越小。
  3. 根据权利要求2所述的一种基于RFID标签RSSI信号值的图书排序方法，其特征在于，步骤2包括如下步骤：
    步骤2-1，将步骤1获得的图书RFID标签根据图书RFID标签EPC号进行划分，将有相同EPC号的图书RFID标签划分为一类，代表一本图书的图书RFID标签在不同时间t返回的RSSI值；
    步骤2-2，在每个划分好的类中，按照时间t的顺序对每一类图书RFID标签的RSSI值排序，得到一个RFID标签RSSI值随时间t变化的曲线图；
    步骤2-3，图书RFID标签的RSSI值随着时间t变化形成曲线，找出曲线图中的最高波峰，保留拥有最高波峰的一段连续曲线，将其他散点或者拥有波峰但非最高波峰 的一段曲线剔除。
  4. 根据权利要求3所述的一种基于RFID标签RSSI信号值的图书排序方法，其特征在于，步骤3包括：对步骤2中保留的曲线进行二次曲线拟合，得出拟合后的曲线的波峰即最高点所在的时间T。
  5. 根据权利要求4所述的一种基于RFID标签RSSI信号值的图书排序方法，其特征在于，步骤4包括：对步骤3得到的所有图书RFID标签的时间T从小到大进行排序，得出的时间顺序即对应每本图书在书架上的位置顺序。
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