KR20070057601A - Apparatus and method for measuring identification distance of a multiple of rfid tags - Google Patents

Abstract

A device and a method for measuring the recognition distance of plural RFID(Radio Frequency Identification) tags are provided to facilitate measurement of the recognition distance under various tag loading environment conditions and to shorten the measuring time by measuring plural articles at the same time. A recognition distance measuring device of plural RFID tags for measuring performance of the RFID tag of a moving device moving with loading articles attached with the RFID tags is composed of an RFID reader(40) reading the RFID tag; a distance sensing unit(50) measuring the distance to the moving device in real time; a control unit(60) making RFID tag data read by the RFID reader and distance measurement data supplied from the distance sensing unit in real time, correspond to pre-stored RFID tag information of the articles; a user interface unit(80) receiving the RFID tag information of the articles in advance by a user and providing the result processed by the control unit to the user; and a storing unit(70) storing the RFID tag information of the articles and the result processed by the control unit.

Description

Apparatus and method for measuring identification distance of a multiple of RFID tags}

1 is a configuration diagram of an apparatus for measuring a recognition distance of a plurality of RFID tags according to the present invention;

2 is a flowchart illustrating a method for measuring a recognition distance of a plurality of RFID tags according to the present invention;

Figure 3 is a perspective view of an embodiment of a test apparatus for measuring the recognition distance of a plurality of RFID tags to which the present invention is applied.

* Explanation of symbols on the main parts of the drawing

10: tag set 20: sensor

30: reader antenna set 40: distance detection unit

50: reader 60: control unit

70: storage

The present invention relates to a plurality of RFID tag recognition distance measuring apparatus and method thereof, and more particularly, when the distance of a mobile device that loads and moves a plurality of tags in real time is recognized by a reader for each tag, A plurality of RFID tag recognition distance measuring apparatus for checking the distance measurement data between each recognized tag data and the mobile device to measure the stored information as the recognition distance of each tag in correspondence with the location information loaded for each tag stored in advance. It's about how.

With the development of automatic identification and data collection (AIDC) technology, researches for the use of RFID (Radio Frequency IDentification) systems in the fields of logistics, distribution, and warehouse management are being actively conducted. In particular, the passive RFID system is installed in a portal gate of a building or a store entrance and used for inventory management, history management, theft prevention, and the like.

The passive RFID system is a system in which an RFID reader installed in a portal gate recognizes an RFID tag and transmits tag data to a control computer when a mobile device loaded with a plurality of RFID tags is passed through a portal gate. to be. In particular, in a passive RFID system, when a mobile device loaded with a plurality of RFID tags is passed through a portal gate, the recognition performance of each tag (ie, the recognition rate degraded as the mobile device moves, Error, recognition distance (or recognition range)] is different.

In order to apply the passive RFID system to a real environment, a performance test that simulates the passive RFID system and recognizes each tag when a plurality of RFID tag-attached unit articles are loaded and passes through the portal gate is performed.

In the performance test system as described above, whether the recognition rate and the tag data error can be determined based on the number of predefined tags and the recorded data of each tag, but it is difficult to measure the recognition distance that is different for each tag.

That is, the recognition distance in the performance test has a disadvantage in that it takes a long time to measure by individually measuring the tag attached to the article because the radio environment conditions are different for each tag.

Therefore, in the conventional recognition distance measuring system, when articles with a plurality of RFID tags attached are loaded and pass through the portal gate, there is a need to shorten the time for measuring the recognition distance of each tag.

The present invention has been proposed to solve the above problems and to meet the above requirements, and when the distance of the mobile device that loads and moves a plurality of tags in real time is recognized by the reader for each tag, the reader A plurality of RFID tag recognition distance measuring devices for checking the distance measurement data between each recognized tag data and the mobile device and measuring the stored information as the recognition distance of each tag in correspondence with the location information loaded for each tag stored in advance. The purpose is to provide a method.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. It will also be appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

In order to achieve the above object, the present invention provides a RFID reader for recognizing the RFID tag, in the apparatus for measuring the recognition distance of a plurality of RFID tags, which measures the performance of the RFID tag of a mobile device in which articles with an RFID tag are loaded and moved. With a leader; A distance detecting unit measuring a distance from the mobile device in real time; A control unit which corresponds to RFID tag data recognized by the RFID reader and distance measurement data provided in real time from the distance detection unit to RFID tag information of the items stored in advance; A user interface unit which receives the RFID tag information of the articles in advance by a user and provides a result of processing by the controller to the user; And a storage unit which stores the RFID tag information of the articles and the processing result by the controller.

In addition, the present invention is a method of measuring the recognition distance of a plurality of RFID tags to measure the performance of the RFID tag of the mobile device that is loaded with the RFID tag attached mobile device, the position information for each RFID tag input by the user Storing and storing the first RFID tag data when receiving distance measurement data from the mobile device; When the first RFID tag data is input while receiving the distance measurement data with the mobile device, the received first RFID tag data and the distance measurement data with the mobile device are checked to correspond to the previously stored position information for each RFID tag. A second step of storing the same; A third step of processing the second RFID tag data in the same manner as the processing of the first RFID tag data in the second step if the second RFID tag data is received after processing the first RFID tag data; And a fourth step of terminating the recognition distance measurement of the second RFID tag if the distance measurement data with the mobile device is not provided.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Prior to describing the present invention, the present invention refers to a distance between a mobile device and a recognition distance measuring device (that is, a distance sensing unit to be described later) without using the distance between the tag and the reader antenna as a recognition distance. That is, by matching the distance between the tag recognized in the present invention and the reader antenna by the distance between the mobile device and the recognition distance measuring device, it is possible to check the performance of the tag recognized according to the corresponding position of the mobile device moving to the portal gate.

1 is a configuration diagram of an apparatus for measuring a recognition distance of a plurality of RFID tags according to the present invention.

As shown in FIG. 1, a recognition distance measuring apparatus (hereinafter, referred to as "a recognition distance measuring apparatus") of a plurality of RFID tags according to the present invention includes a reader antenna set 30, a reader 40, and a distance detecting unit ( 50, a control unit 60, and a storage unit 70.

In addition, the moving device is a trolley or a forklift or the like that moves by loading a plurality of tagged articles. The article has respective tags having different radio wave environmental conditions and different recognition distances, which are collectively referred to as a tag set 10. Here, the tag stores identification information of the tag and detailed information about the article (hereinafter referred to as "tag data") in its own memory. On the other hand, the moving device has a reflector 20 for the distance sensing unit 50 to measure the distance to the moving device.

The reader antenna set 30 refers to each of the reader antennas installed around the portal gate through which the mobile device passes. In addition, the reader antenna set 30 is composed of a multi-band antenna for detecting a tag attached to an article.

The reader 40 modulates a continuous electromagnetic wave having a specific frequency and transmits it to the tag set 10 through each antenna constituting the reader antenna set 30. At this time, the reader 40 receives electromagnetic waves whose backscatter modulated tag data stored in a memory of a specific tag of the tag set 10 is backscatter modulated. Here, since the above-described technology of collecting the tag data of the tag by the reader 40 can be easily understood by those skilled in the art, a detailed description thereof will be omitted.

In addition, the reader 40 recognizes the tags of the tag set 10 in an arbitrary order and inputs the tags to the controller 60.

The distance detecting unit 50 operates when the reflecting plate 20 attached to the moving device is within a predetermined range to measure the distance to the reflecting plate 20 in real time. In this case, the distance detecting unit 50 measures the distance by a conventional method using ultrasonic waves, infrared rays, or the like. In addition, measuring the distance to the reflector 20 in the distance detecting unit 50 will be described for convenience by measuring the distance to the moving device.

In addition, the distance detecting unit 50 transmits a signal generated by the detection of the reflection plate 20 of the mobile device to the control unit 60 and real-time the distance information (hereinafter, referred to as "distance measurement data") of the measured mobile device. To the control unit 60.

The controller 60 manages the reader 40, the distance sensing unit 50, the storage unit 70, and the user interface unit 80 constituting the recognition distance measuring apparatus.

In addition, the controller 60 receives tag data from the reader 40 and receives distance measurement data from the distance sensor 50 in real time. In particular, the controller 60 monitors the distance measurement data when there is no input of tag data, and then checks the distance measurement data that is being monitored when the tag data is input. At this time, the control unit 60 stores the loading position information for each tag previously input from the user interface unit 80 in the storage unit 70 and stores the tag data and the distance measurement data in correspondence with the corresponding tags. . For example, Table 1 below.

Loading location information by tag Tag data Distance measurement data Tag 1 Tag data 1 R3 Tags 2 Tag data 2 R1 Tag 3 Not measurable Not measurable … … … Tag N Tag data N R2

In Table 1, the loading position information for each tag is information input in advance from the user interface unit 80, and the tag data and the distance measurement data are confirmed by a performance test. Also, in Table 1, the distance measurement data is in the order of R1 to RN according to the distance.

As shown in Table 1, the control unit 60 checks the tag data received from the reader 40 and the distance measurement data provided in real time to the tag position information for each tag previously input from the user interface unit 80, and corresponding tags. To match. That is, the controller 60 first receives tag data of "tag 2" from the reader 40 and checks "R1" provided from the distance sensing unit 50 to correspond to tag 2 as shown in Table 1 below. Thereafter, the controller 60 performs the tag N and the tag 1 in the same manner as the tag 2. The same applies to the tags omitted in Table 1. On the other hand, the control unit 60 cannot receive the tag data of the tag 3 from the reader 40 and thus cannot determine the distance measurement data provided by the distance sensing unit 50, and thus, the measurement is impossible. Through this, the control unit 60 provides the user with the result performed as shown in Table 1 through the user interface unit 80 so as to measure the performance of each tag, that is, the recognition distance measurement.

On the other hand, as shown in Table 1, the controller 60 preferably stores the result of associating the tag data with the distance measurement data in the storage unit 70 as a table.

In addition, the controller 60 runs a program stored in the storage unit 70, that is, an application, that is, an application, and performs a series of processes as described above.

The storage unit 70 stores loading position information for each tag received through an application for operating the recognition distance measuring device and the user interface unit 80. In particular, the storage unit 70 is the result of the application driven and processed by the control unit 60 (that is, the information corresponding to the tag data for each tag and the distance measurement data as shown in Table 1, the movement path information of the mobile device, etc.) Save it.

The user interface unit 80 receives information necessary for measuring the recognition distance of the tag set 10 from the user, and provides the processing result of the control unit 60 to the user in real time.

2 is a flowchart illustrating a method for measuring a recognition distance of a plurality of RFID tags according to the present invention.

The control unit 60 receives the loading position information for each tag to the user interface unit 80 and stores it in the storage unit 70 (S100).

After that, when the mobile device on which the tag set 10 is loaded moves to the reader antenna set 30, the controller 60 receives distance measurement data in real time while measuring the distance of the mobile device. (S101).

Meanwhile, when the tag data is input from the reader 40 (S102), the controller 60 checks the distance measurement data provided by the distance sensing unit 50 at the moment when the tag data is recognized by the reader 40 (S103). . At this time, the control unit 60 stores the tag data received in the loading position information of the corresponding tag and the distance measurement data checked at the moment of receiving the tag data in correspondence (S104).

On the other hand, if there is another tag data input from the reader 40, the controller 60 performs the above-described process (S105). At this time, if there is no provision of the distance measurement data from the distance detection unit 50 (S106), the control unit 60 terminates the recognition distance measurement of the tag (S107).

Figure 3 is a perspective view of an embodiment of a test apparatus for measuring the recognition distance of a plurality of tags to which the present invention is applied.

As shown in FIG. 3, when the article with the tag set 10 is attached to the moving device and moved to the portal gate, the controller 60 may measure the distance measurement data measured between the distance sensing unit 50 and the reflector 30. It is provided in real time.

Thereafter, the controller 60 receives the tag data recognized in any order from the reader antenna set 30 through the reader 30. At this time, the controller 60 checks the distance measurement data and stores the distance measurement data in the storage unit 70 in correspondence with the tag data.

Meanwhile, the controller 60 outputs the distance measurement data corresponding to the tag data through the user interface unit 80 at the request of the user.

In addition, the control unit 60 continuously performs the above process until the moving device moves so that the distance measurement data measured from the distance detecting unit 50 is not provided.

As described above, the method of the present invention may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form. Since this process can be easily implemented by those skilled in the art will not be described in more detail.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

The present invention as described above, it is easy to measure the recognition distance in the environment in which the tag is variously loaded, there is an effect that can support a test close to the real environment by supporting the recognition distance measurement for various test conditions.

In addition, the present invention has the effect that the measurement time of the recognition distance can be shortened by performing the measurement on a plurality of articles at the same time.

In addition, the present invention has the effect that can be used in the method of arranging the RFID antenna for efficient electromagnetic field radiation by measuring the recognition point for each tag in three dimensions.

Claims (3)

In the apparatus for measuring the recognition distance of a plurality of RFID tags to measure the performance of the RFID tag of the mobile device that is loaded with the RFID tag attached mobile device, An RFID reader for recognizing the RFID tag; A distance detecting unit measuring a distance to the mobile device in real time; A control unit corresponding to RFID tag information of the articles stored in advance, the RFID tag data recognized by the RFID reader and distance measurement data provided in real time from the distance sensing unit; A user interface unit which receives the RFID tag information of the articles in advance by a user and provides a result of processing by the controller to the user; And A storage unit which stores the RFID tag information of the articles and the processing result by the controller; Recognition distance measuring apparatus of a plurality of RFID tags comprising a. According to claim 1, The distance detecting unit detects a reflection plate installed in the mobile device and measures the distance of a plurality of RFID tags, characterized in that for measuring the distance. In the method of measuring the recognition distance of a plurality of RFID tags to measure the performance of the RFID tag of the mobile device that is loaded with the RFID tag attached mobile device, A first step of storing stored location information for each RFID tag received by a user and receiving first RFID tag data when receiving distance measurement data with the mobile device; When the first RFID tag data is input while receiving the distance measurement data with the mobile device, the received first RFID tag data and the distance measurement data with the mobile device are checked to correspond to the previously stored position information for each RFID tag. Second step of storing; A third step of processing the second RFID tag data in the second step in the same manner as the processing of the first RFID tag data after receiving the second RFID tag data after processing the first RFID tag data; And A fourth step of terminating the recognition distance measurement of the second RFID tag when not receiving the distance measurement data with the mobile device; Recognition distance measuring apparatus of a plurality of RFID tags comprising a.

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