JP4992124B2 - Article monitoring system, article monitoring method, and article monitoring program - Google Patents

Description

  The present invention relates to an article monitoring system, an article monitoring method, and an article monitoring program.

  In recent years, for the purpose of distribution management of goods, etc., it is driven by receiving power from a tag reader wirelessly, and the reflected wave is controlled according to the information recorded therein, so that the recorded information is sent to the tag reader as a response signal. Passive non-contact IC tags that transmit are becoming widely used.

  For example, Patent Document 5 discloses a technique for providing a warning antenna to prevent theft of an article when a reader antenna that reads information on an identification tag is installed at an entrance / exit gate and it is detected that the identification tag passes through the gate. Are listed. Similarly, as a method for managing an article by attaching an identification tag to an object, Patent Document 2 discloses that a movement distance is detected based on a change in the distance detected by the identification tag, and a case where the threshold is exceeded or the identification tag is detected. Techniques have been described that provide a simple safety protection system for an object by driving an alarm when it cannot.

  Patent Document 3 and Patent Document 6 are methods for attaching a tag to a person and performing security for a building or the like. A technology that strengthens crime prevention by detecting the entry / exit (or presence) of a user into a predetermined area with the presence of an identification tag and operating a security system such as a surveillance camera in the case of an unauthorized user Are listed. Further, in Patent Document 4, when the opening / closing of the storage unit is detected by a sensor, the information stored in the storage unit is lost by reading and recording the information of the identification tag of the user in the vicinity. Describes a technique for assisting in searching for lost items.

  Patent Document 1 describes a technology that permits a user who has received permission to move an article corresponding to the user by attaching a tag to both an object and a person. Further, as in Patent Document 5, it is possible to read tag information of a user and an article with a tag reader, record them in combination, and use it as a method for determining the presence or absence of forgotten items.

JP 11-259773 A Special Table 2002-525640 JP 2005-4256 A JP 2006-54510 A JP 2006-171897 A JP 2006-338467 A

  When attaching a tag to an article, it is necessary not only to detect an abnormality such as theft, but also to install a tag reader unless it passes through a tag reader installed at an entrance or the like. In addition, when installing sensors that detect abnormalities on shelves that manage articles, etc., or when installing security cameras, dedicated security measures are often required, compared to tag installation, Cost and effort are required.

  Further, when the article is a document or the like, when the third party browses on the spot, there is no movement of the article (tag), so that an abnormality cannot be detected. Further, when a person who has obtained permission uses the article, it is desirable that the article is not determined to be abnormal even if the article is moved, and that matching is easily performed.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an article monitoring system, an article monitoring method, and an article monitoring program that can be installed easily and inexpensively and prevent theft of articles.

An article monitoring system according to a first aspect of the present invention includes:
An RF tag having identification information;
Arrival direction detection means for detecting the arrival direction of the radio wave emitted by the RF tag;
Change detection means for detecting the movement direction of the RF tag from a change in the arrival direction of the radio wave by detecting the arrival direction of the radio wave emitted by the RF tag by the arrival direction detection means twice or more;
Means for detecting the time when the direction of arrival of the radio wave is detected;
Alarm output means for issuing an alarm when the magnitude of displacement of the movement of the RF tag detected by the change detection means exceeds a predetermined range ;
Equipped with a,
Said alarm output means, the time of detection of the predetermined displacement magnitude or more mobile of the RF tag in the change detection means when it is outside the range of a predetermined time, and wherein Rukoto that Hassu an alarm.

An article monitoring method according to a second aspect of the present invention includes:
A direction-of-arrival detection step for detecting a direction of arrival of a radio wave emitted by an RF tag having identification information executed by the article monitoring system ;
A change detection step for detecting the displacement of the RF tag from a change in the arrival direction of the radio wave by detecting the arrival direction of the radio wave emitted by the RF tag by the arrival direction detection step twice or more;
Detecting the time when the direction of arrival of the radio wave is detected;
An alarm output step for issuing an alarm when the magnitude of displacement of the movement of the RF tag detected in the change detection step exceeds a predetermined range ;
Equipped with a,
Wherein at alarm output step, when the time of detecting the displacement of a predetermined size or larger movement of the RF tags by the change detection step is outside of a predetermined time, and wherein Rukoto that Hassu an alarm.

The article monitoring program according to the third aspect of the present invention provides:
On the computer,
A direction-of-arrival detection step for detecting a direction of arrival of a radio wave emitted by an RF tag having identification information;
A change detection step for detecting the displacement of the RF tag from a change in the arrival direction of the radio wave by detecting the arrival direction of the radio wave emitted by the RF tag by the arrival direction detection step twice or more;
Detecting the time when the direction of arrival of the radio wave is detected;
An alarm output step for issuing an alarm when the magnitude of displacement of the movement of the RF tag detected in the change detection step exceeds a predetermined range ;
Was executed,
Wherein at alarm output step, when the time of detecting the displacement of a predetermined size or larger movement of the RF tags by the change detection step is outside of a predetermined time, and wherein Rukoto that Hassu an alarm.

  ADVANTAGE OF THE INVENTION According to this invention, an article | item monitoring system can be installed easily and cheaply, and it can be used for prevention of article theft.

It is a block diagram which shows the structural example of the article | item monitoring system which concerns on Embodiment 1 of this invention. It is a conceptual diagram which shows the example provided with the article | item monitoring system of Embodiment 1. FIG. 3 is a flowchart illustrating an example of an operation in the article monitoring system according to the first embodiment. It is a block diagram which shows the structural example of the article | item monitoring system which concerns on Embodiment 2 of this invention. It is a conceptual diagram which shows the example provided with the article | item monitoring system of Embodiment 2. FIG. It is a figure which shows an example of the data which memorize | store the relationship between a user and a tag. 10 is a flowchart illustrating an example of an operation in the article monitoring system according to the second embodiment. It is a block diagram which shows an example of the hardware constitutions of an article | item monitoring system.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals.

(Embodiment 1)
FIG. 1 is a block diagram illustrating a configuration example of an article monitoring system according to Embodiment 1 of the present invention. FIG. 2 is a conceptual diagram showing an example provided with the article monitoring system of FIG.

  The article monitoring system 1 includes an antenna 11, a transmission / reception unit 12, an arrival direction detection unit 13, a change detection unit 14, an alarm unit 15, and a position information storage unit 16. In the article monitoring system 1, each part and the entire system are controlled by a control unit (not shown). Here, the object to be monitored is the object A, and the RF tag 2 is pasted. For example, it is assumed that the object A is a personal computer and its use is limited only at a predetermined place (desk). A predetermined area R1 that is a range in which radio waves of the antenna 11 can be transmitted and received is set so as to cover the desk.

  The antenna 11 uses an array antenna including a plurality of antenna elements 11a in order to receive radio waves transmitted from the RF tag 2 at a plurality of positions. For example, a planar array antenna in which microstrip antennas are arranged or an ESPAR antenna can be used.

  The transmission / reception unit 12 radiates and feeds radio waves to the RF tag 2 and receives radio waves transmitted by the RF tag 2. The passive type RF tag 2 has a built-in rectifier circuit inside the radio wave absorption signal reflection unit, and rectifies the radio wave from the transmission / reception unit 12 received by the antenna of the tag and converts it into a direct current. Is a mechanism that works. Usually, the radio wave from the transmission / reception unit 12 is modulated by a command bit string following the preamble. This is followed by an unmodulated carrier. In the preamble part, energy necessary for the initial operation of the circuit is stored. Then, the command bit string is demodulated and interpreted, and information is returned by adding the transmission code stored in the tag information storage unit to the reflected wave in the unmodulated part carrier part. Amplitude modulation, frequency modulation, phase modulation, or a combination thereof is used for modulation of the signal transmitted from the transmission / reception unit 12 and the reply of the RF tag 2.

  The frequency band used for communication with the RF tag 2 is not particularly limited, but the higher the frequency, the smaller the antenna element 11a and the antenna 11 can be made. For example, a frequency band of 2.45 GHz can be used. The target of this embodiment does not need to conform to the RF tag communication standard. It is also possible to use higher frequencies.

  The arrival direction detector 13 detects the arrival direction of the radio wave from the signal received by the antenna 11. In principle, it is possible to know the direction of arrival from the time difference when the radio wave reaches the antenna 11. Interference due to radio wave reflection, diffraction, and the like, and a leakage signal of transmission power are generated. Therefore, in order to accurately detect the direction of arrival, it is necessary to remove such interference. For the arrival direction estimation, for example, a RBF (Radial Basis Function) neural network or a MUSIC method (MUltiple SIgnal Classification method) can be used. In addition, for example, a minimum norm method (ESM) or ESPRIT (Estimation of Signal Parameters via Rotational Invariance Techniques) may be used.

  The change detection unit 14 detects a change in the arrival direction of the received radio wave when the RF tag 2 is read at least twice or more. The object A is estimated from the arrival direction of the radio wave, and the movement (displacement) of the object A is calculated from the change in the arrival direction of the radio wave. Then, the detected change in the arrival direction or the displacement of the object A calculated therefrom is transmitted to the alarm unit 15 and the position information storage unit 16.

  The arrival direction and displacement calculated by the arrival direction detection unit 13 and the change detection unit 14 will be described. When the transmission / reception unit 12 receives the response signal while changing the direction in which the inquiry signal is transmitted and finds a place where the response signal is maximized, the RF tag 2 exists in the direction in which the inquiry signal was transmitted. I understand. Further, the distance from the antenna 11 to the RF tag 2 can be calculated from the time from when the inquiry signal is transmitted until the response signal is received, the phase difference of the received response signal, and the like. This calculation method is well known and is described, for example, in the 2008 IEICE General Conference B-1-212 “Trial Production of RF Tag Arrival Direction Estimation System”.

  The alarm unit 15 displays an alarm when the displacement of the object A is detected. For example, an alarm is generated by a sound such as a siren ringing or light such as lighting of a warning light. Further, notification to the security company, mail notification to the owner of the object A, or the like may be used.

  The position information storage unit 16 stores the position of the latest object A or the position coordinates of the area R1 where the object A should exist. The most recent position of the object A is information necessary for calculating the movement (displacement) by the change detection unit 14, and may be overwritten or recorded as the position information is detected. The position coordinates of the area R1 are used by the change detection unit 14 to determine the presence or absence of movement (displacement) based on the difference between the direction of the position coordinates and the arrival direction of the received radio wave.

  FIG. 3 is a flowchart showing an example of the monitoring operation of the article monitoring system according to the first embodiment. The transmission / reception unit 12 reads the data of the RF tag 2 by radiating and feeding power to the RF tag 2 and receiving the radio wave transmitted by the RF tag 2 (step S11).

  The arrival direction detection unit 13 detects the arrival direction of radio waves (step S12). The change detection unit 14 calculates a change between the arrival direction of the current radio wave and the arrival direction of the previous radio wave (step S13).

  If there is no change in the arrival direction of the radio wave (step S14; NO), the process returns to step S11 and the RF tag 2 is read again.

  When there is a change in the arrival direction of the radio wave (step S14; YES), the alarm unit 15 displays an alarm (step S15).

  As described above, according to the article monitoring system 1 of the first embodiment, it can be installed easily and inexpensively, and theft of articles can be prevented. Since the RF tag 2 attached to the object A is a passive type and does not require a battery, it does not take time to replace the battery and can be prevented from being monitored due to a battery exhaustion.

  When a tag reading gate is installed at the doorway, it may be taken out without passing through a tag reader, such as taking out from a window. In that case, an alarm cannot be issued. In the article monitoring system 1 of the first embodiment, since the displacement of the object A placed in the area R1 is detected, an alarm can be given. Further, even when the object A is enclosed by a shield member or the like and passed through a tag reader, the tag cannot be read and an alarm cannot be made. In this case, it is possible to cope with this by setting in advance an alarm when the presence of the RF tag 2 cannot be detected from the area R1.

  Furthermore, if the displacement amount calculated by the change detection unit 14 is set to warn only when it exceeds a predetermined range, the direction is slightly changed so that the object A (personal computer) is easy to see. For example, when there is a displacement in normal use, an alarm is not required. Also, once the alarm unit 15 starts an alarm and the presence of the RF tag 2 can no longer be detected from within the area R1, the condition of the article (here, the object A) It is also possible to change the alarm level depending on the position.

(Embodiment 2)
FIG. 4 is a block diagram showing a configuration example of an article monitoring system according to Embodiment 2 of the present invention. FIG. 5 is a conceptual diagram showing an example provided with the article monitoring system of FIG. The article monitoring system according to the second embodiment can detect an RF tag possessed by a user and determine whether the user has obtained permission. The basic structure of the article monitoring system 1 is the same as that of the first embodiment, and is additionally provided with a code detection unit 18 and a time detection unit 19. Further, although the data storage unit 17 is provided instead of the position information storage unit 16, the information stored in the position information storage unit 16 is included in part of the information stored in the data storage unit 17.

  In FIG. 5, it is assumed that the article monitoring system 1 includes two devices, that is, an antenna 11 portion and other portions. A device including a configuration other than the antenna 11 can be connected to the antenna 11 via a network, and functions as the article monitoring system 1 as a whole. The articles to be monitored are set as the objects A1 and A2, and are stored in the storage unit S. The storage S can be opened and closed by a slide type or a double door type door. The RF tag 2a is attached to the door portion of the storage unit S. When the door is opened and closed, the RF tag 2a attached to the door is also moved (displaced) at the same time, so that it is assumed that the objects A1 and A2 are used in some form.

  A predetermined area R2 that is a range in which radio waves of the antenna 11 can be transmitted and received is set so as to cover the door portion of the storage unit S, that is, to surround the position of the displaced RF tag 2a. Further, it is assumed that the user U who is permitted to use the object A1 has the RF tag 2b in the form of an employee card or the like.

  For example, it is assumed that the object A1 is a book, a document, or the like, and even if the object itself is not stolen, there is a possibility that the information described therein can be seen without permission. Since the object A2 is a floppy or the like and there are a plurality of objects, it is difficult to attach the RF tag 2 to each object, or even if the RF tag 2 is attached, the RF tag 2 itself may be easily removed. It is assumed that it is difficult to attach the RF tag 2 to the object A2 itself. It is assumed that the objects A1 and A2 can be viewed and taken out by opening and closing the door of the storage unit S. The opening and closing of the door is performed by the movement (displacement) of the RF tag 2a. Can be detected.

  The data storage unit 17 records the combination of the objects A1 and A2 and the user U permitted to use the objects A1 and A2 in the form of a database. Similarly to the position information storage unit 16, the data storage unit 17 stores the latest position of the object A or the position coordinates of the area R2 where the object A should exist.

  An example of the database stored in the data storage unit 17 is shown in FIG. The name, the ID number of the RF tag 2b possessed by the user U, the number of the object A that the user U is permitted to use, the time zone in which the user U is permitted to use, and the like are recorded. The database also manages the number of the object A, the ID number of the RF tag 2a given to the object A, the ID number of the RF tag 2a attached to the storage section S that stores the object A, and the like. Can do.

  The code detector 18 demodulates the received radio wave and detects the code transmitted by the RF tag 2b. The code transmitted by the RF tag 2b includes a unique identification code of the RF tag 2b. Further, the code detection unit 18 determines whether or not the detected code satisfies a predetermined condition in the data of the data storage unit 17, for example, a condition as to whether or not the user U is permitted to use the object A. Also do it.

  The time detection unit 19 mainly detects the time when the change detection unit 14 detects the displacement of the RF tag 2a or the code detection unit 18 detects the coincidence of the combination of the user U and the object A. Further, in the time detection unit 19, whether or not the detected time satisfies a predetermined condition in the data of the data storage unit 17, for example, a condition that the user U uses the object A within the permitted time. Also make a judgment. Further, the time detection unit 19 may notify the data storage unit 17 of the time when the RF tags 2a and 2b are read and the time when the RF tags 2a and 2b are displaced. The data storage unit 17 can receive time data and store / save the time data together with the identification numbers and position coordinates of the RF tags 2a and 2b.

  Next, the operation of the present embodiment will be described with reference to FIGS. FIG. 7 is a flowchart showing an example of the monitoring operation of the article monitoring system according to the second embodiment.

  The transmitting / receiving unit 12 radiates and feeds radio waves to the RF tag 2a of the storage unit S, and receives the radio waves transmitted by the RF tag 2a, thereby reading the data of the RF tag 2a (step S21). Since the displacement of the RF tag 2a means that the storage unit S is opened and closed, the displacement of the RF tag 2a is assumed to be in a state of using the objects A1 and A2 stored in the storage unit S.

  The arrival direction detection unit 13 detects the arrival direction of radio waves (step S22). The change detection unit 14 calculates a change between the arrival direction of the current radio wave and the arrival direction of the previous radio wave (step S23).

  If there is no change in the arrival direction of the radio wave (step S24; NO), the process returns to step S21 to read the RF tag 2a again.

  When there is a change in the arrival direction of the radio wave (step S24; YES), data reading of the RF tag 2b of the user U is performed (step S25). If the user U's RF tag 2b is permitted to use the objects A1 and A2 (step S26; YES), the alarm is canceled (step S27), and the alarm stops without being activated. Then, returning to step S21, the RF tag 2a is read.

  If the RF tag 2b of the user U is not permitted to use the RF tags 2a of the objects A1 and A2 (step S26; NO), the alarm unit 15 displays an alarm (step S28).

  In the permission in step S26, not only the combination of the user U and the object A but also the available time zone may be included in the conditions. In addition, the permission condition can be arbitrarily set, for example, only the time period available for the user U can be included.

  As described above, according to the article monitoring system of the second embodiment, it can be easily and inexpensively installed, and theft of articles can be prevented. Furthermore, information leakage such as documents can be prevented.

  The RF tag 2a attached to the storage unit S and the RF tag 2b possessed by the user U may be either an active type or a passive type. In the case of the passive type, it is necessary to supply power when reading the data of the RF tag 2, but it is not necessary to replace the battery, and it is not necessary to replace the battery. Can do.

  It is not necessary to monitor the object A with a monitoring camera or the like by canceling the alarm and not displaying the alarm only when the authorized user U uses the object A registered in the database or the like. Also, there is no need to restrict access to the place where the object A is stored. Although it is necessary to register the combination of the object A and the user U, theft of the article can be prevented easily and at low cost simply by installing the RF tag 2 and the antenna 11.

  Moreover, even if the RF tag 2 is simply attached to the book or document that is the object A, it is not possible to prevent the information from being taken out, but cannot prevent the leakage of information due to browsing on the spot. In order to prevent information leakage, it has been necessary to take measures such as using a surveillance camera or restricting access to the storage location of the object A. However, if there is a storage section S that can be opened and closed, it is possible to easily take measures simply by attaching the RF tag 2a and prevent information leakage. Moreover, since it can detect that the storage part S was opened and closed and the user U at that time is known, it can also memorize | store as a record of information browsing.

  In Embodiment 1 mentioned above, the case where the object A provided with the RF tag 2 is singular is cited. However, a plurality of objects A may be present as long as they exist in the area R1. Also in the second embodiment, the number of objects A is larger than the number of storage spaces if the RF tag 2a is attached according to the number of storage spaces in the storage section S. Also good. However, depending on the opening / closing method of the storage unit S, two RF tags 2a may be required for one storage unit S.

  The warning method performed by the warning unit 15 may be a notification by means of a buzzer or a light flashing by a patrol lamp, a notification to a security company, or a mail notification to a person in charge. When the entire room or the like is monitored by a monitoring camera, the shooting direction of the monitoring camera is switched according to an instruction from the alarm unit 15 from the control unit 31, and the direction of the object A is set to be shot by the camera. Good.

  FIG. 8 is a block diagram illustrating an example of a hardware configuration of the article monitoring system 1 illustrated in FIG. 1 or 4. As shown in FIG. 8, the article monitoring system 1 includes a control unit 31, a main storage unit 32, an external storage unit 33, an operation unit 34, a display unit 35, and a transmission / reception unit 36. The main storage unit 32, the external storage unit 33, the operation unit 34, the display unit 35, and the transmission / reception unit 36 are all connected to the control unit 31 via the internal bus 30.

  The control unit 31 includes a CPU (Central Processing Unit) and the like, and executes the above-described processing of the article monitoring system 1 according to the article monitoring program 50 stored in the external storage unit 33.

  The main storage unit 32 is configured by a RAM (Random-Access Memory) or the like, and loads an article monitoring program 50 stored in the external storage unit 33 and is used as a work area of the control unit 31.

  The external storage unit 33 includes a non-volatile memory such as a flash memory, a hard disk, a DVD-RAM (Digital Versatile Disc Random-Access Memory), a DVD-RW (Digital Versatile Disc ReWritable), etc. An article monitoring program 50 to be executed is stored in advance, and data stored in the program is supplied to the control unit 31 according to an instruction from the control unit 31, and the data supplied from the control unit 31 is stored.

  The position information storage unit 16 in FIG. 1 or the data storage unit 17 in FIG. 4 is configured in the external storage unit 33. When the article monitoring process is performed, part of the data is stored in the main storage unit 32 and used for the operation of the control unit 31.

  The operation unit 34 includes a pointing device such as a keyboard and mouse, and an interface device that connects the keyboard and pointing device to the internal bus 30. Information such as a numerical value defining a range such as a moving direction and a distance and a combination of the user U and the RF tag 2 (or the object A) is input via the operation unit 34 and supplied to the control unit 31.

  The display unit 35 is configured by a CRT (Cathode Ray Tube), an LCD (Liquid Crystal Display), or the like, and displays the locus of the RF tag 2, owner information, and the like. The display unit 35 may not be provided.

  The transmitting / receiving unit 36 includes a wireless transmitter / receiver, a wireless modem or a network terminating device, and a serial interface or a LAN (Local Area Network) interface connected thereto. The transmission / reception unit 36 transmits / receives a radio signal of the RF tag 2 via the antenna 11.

  The central part that performs the article monitoring process including the control unit 31, the main storage unit 32, the external storage unit 33, and the internal bus 30 may be configured separately from the RF tag reader that includes the antenna 11. At this time, the central part that performs the former gate control processing and the reader of the RF tag communicate via the network.

  Other suitable modifications of the present invention include the following configurations.

About the article monitoring system according to the first aspect of the present invention,
Preferably, the warning output means issues a warning by the warning output means when the magnitude of displacement of the movement of the RF tag exceeds a predetermined range by the change detection means.

Preferably, it comprises means for detecting the time when the direction of arrival of the radio wave is detected,
The alarm output means issues an alarm in the alarm output means when the change detection means detects the displacement of the movement of the RF tag greater than or equal to a predetermined size within a predetermined time range. Features.

  Preferably, the alarm output means includes any one of a means for generating sound, a means for generating light, a means for transmitting an electric signal, or a combination thereof.

Preferably, a second RF tag holding person identification information;
Code detecting means for detecting a code transmitted by the second RF tag;
An alarm stop means for stopping the alarm output means from issuing an alarm when the code detected by the code detection means meets a predetermined condition;
It is characterized by providing.

About the article monitoring method according to the second aspect of the present invention,
Preferably, in the alarm output step, an alarm is issued in the alarm output step when the magnitude of displacement of the movement of the RF tag exceeds a predetermined range in the change detection step.

Preferably, the method includes the step of detecting the time when the arrival direction of the radio wave is detected,
In the alarm output step, an alarm is issued in the alarm output step when the time when the displacement detection of the movement of the RF tag larger than the predetermined size is detected in the change detection step is within a predetermined time range. Features.

  Preferably, the alarm output step includes one of a step of generating sound, a step of generating light, a step of transmitting an electrical signal, or a combination thereof.

Preferably, a code detection step of detecting a code transmitted by the second RF tag having human identification information;
An alarm stop step for stopping the alarm output step from issuing an alarm when the code detected in the code detection step meets a predetermined condition;
It is characterized by providing.

  In addition, the above-described hardware configuration and flowchart are examples, and can be arbitrarily changed and modified.

  The central part that performs the article monitoring process including the control unit 31, the main storage unit 32, the external storage unit 33, the internal bus 30 and the like can be realized by using a normal computer system without using a dedicated system. is there. For example, a computer program for executing the above operation is stored and distributed in a computer-readable recording medium (flexible disk, CD-ROM, DVD-ROM, etc.), and the computer program is installed in the computer. Thus, the article monitoring system 1 that executes the above-described processing may be configured. Further, the article monitoring system 1 may be configured by storing the computer program in a storage device included in a server device on a communication network such as the Internet and downloading the computer program from a normal computer system.

  Further, when the functions of the article monitoring system 1 are realized by sharing an OS (operating system) and an application program, or by cooperation between the OS and the application program, only the application program portion is stored in a recording medium or a storage device. May be.

  It is also possible to superimpose a computer program on a carrier wave and distribute it via a communication network. For example, the computer program may be posted on a bulletin board (BBS, Bulletin Board System) on a communication network, and the computer program distributed via the network. The computer program may be started and executed in the same manner as other application programs under the control of the OS, so that the above-described processing may be executed.

1 Article monitoring system 2, 2a, 2b RF tag
11 Antenna
12 Transceiver
13 Direction-of-arrival detection unit
14 Change detector
15 Alarm section
16 Location information storage unit
17 Data storage
18 Code detector
19 Time detector
31 Control unit
32 Main memory
33 External storage
34 Operation unit
35 Display section
36 Transceiver
50 Article monitoring program A, A1, A2 Object
S storage
U user

Claims (7)

An RF tag having identification information;
Arrival direction detection means for detecting the arrival direction of the radio wave emitted by the RF tag;
Change detection means for detecting the movement direction of the RF tag from a change in the arrival direction of the radio wave by detecting the arrival direction of the radio wave emitted by the RF tag by the arrival direction detection means twice or more;
Means for detecting the time when the direction of arrival of the radio wave is detected;
Alarm output means for issuing an alarm when the magnitude of displacement of the movement of the RF tag detected by the change detection means exceeds a predetermined range ;
Equipped with a,
Said alarm output means, the article time it detects a predetermined displacement magnitude or more mobile of the RF tag in the change detection means when it is outside the range of a predetermined time, characterized by Rukoto that Hassu alarm Monitoring system. 2. The article monitoring system according to claim 1 , wherein the alarm output means includes any one of a means for generating sound, a means for generating light, a means for transmitting an electric signal, or a combination thereof. A second RF tag holding human identification information;
Code detecting means for detecting a code transmitted by the second RF tag;
An alarm stop means for stopping the alarm output means from issuing an alarm when the code detected by the code detection means meets a predetermined condition;
The article monitoring system according to claim 1 or 2 , further comprising: A direction-of-arrival detection step for detecting a direction of arrival of a radio wave emitted by an RF tag having identification information executed by the article monitoring system ;
A change detection step for detecting the displacement of the RF tag from a change in the arrival direction of the radio wave by detecting the arrival direction of the radio wave emitted by the RF tag by the arrival direction detection step twice or more;
Detecting the time when the direction of arrival of the radio wave is detected;
An alarm output step for issuing an alarm when the magnitude of displacement of the movement of the RF tag detected in the change detection step exceeds a predetermined range ;
Equipped with a,
The article said alarm output in step, the time of detection of the predetermined displacement magnitude or more mobile of the RF tag in the change detection step if it is outside the range of a predetermined time, characterized by Rukoto that Hassu alarm Monitoring method. 5. The article monitoring method according to claim 4 , wherein the alarm output step includes any one of a step of generating sound, a step of generating light, a step of transmitting an electrical signal, or a combination thereof. A code detection step of detecting a code transmitted by the second RF tag having the identification information of the person;
An alarm stop step for stopping the alarm output step from issuing an alarm when the code detected in the code detection step meets a predetermined condition;
The article monitoring method according to claim 4 or 5 , further comprising: On the computer,
A direction-of-arrival detection step for detecting a direction of arrival of a radio wave emitted by an RF tag having identification information;
A change detection step for detecting the displacement of the RF tag from a change in the arrival direction of the radio wave by detecting the arrival direction of the radio wave emitted by the RF tag by the arrival direction detection step twice or more;
Detecting the time when the direction of arrival of the radio wave is detected;
An alarm output step for issuing an alarm when the magnitude of displacement of the movement of the RF tag detected in the change detection step exceeds a predetermined range ;
Was executed,
The alarm output in the step, when the time of detecting the predetermined displacement magnitude or more mobile of the RF tag in the change detecting step is outside of a predetermined time, the article monitoring program that Hassu an alarm.

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