JP2008109294A - Position monitoring system and position monitoring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile terminal capable of grasping suitable position information corresponding to the location of a person to be monitored, and a position monitoring system using the same. <P>SOLUTION: A GPS function and a radio tag 40 are mounted on the mobile terminal 2. A tag reader 4 is installed in an indoor area to be monitored to detect the presence of the radio tag 40 and transmit detection information to a monitoring center 6. At a position confirmation request from a guardian, the monitoring center 6 reports position information of the radio tag 40. When the radio tag 40 is not detected, the monitoring center 6 transmits a positioning indication signal to the mobile terminal 2 to acquire GPS information, grasps the outdoor position of the mobile terminal 2 from a positioning result based upon the GPS information, and reports it to the guardian. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a position management system and a position management apparatus.

  In recent years, the risk of children being involved in crime has increased, and a system for parents to understand their behavior has been demanded.

  As one of them, a system for managing children's going to and from school using an RFID (Radio Frequency Identification) system has been proposed. In the entry / exit record management system described in Patent Document 1 below, a child has an IC card, and the IC card reading means installed in the school in advance reads the IC card held by the child, etc. Is detected. In addition, when a child's going to school or going to school is detected, the child's guardian who has been registered in advance is notified by e-mail or the like that the child has gone to school or left the school. By receiving this notification, parents can know that the child has arrived at school or left the school. Can be taken.

In addition, a system has been proposed in which a child's whereabouts can be confirmed using GPS (Global Positioning System). In the position monitoring system described in Patent Literature 2 below, a child has a portable terminal equipped with a GPS function, and when a guardian wants to know where the child is, he / she operates a personal computer or a cellular phone to connect the portable terminal to the center. Request confirmation of the current position. The center calculates the current position information of the mobile terminal based on the GPS information acquired by the mobile terminal held by the child, shows the child's whereabouts on a map, and provides it to the guardian. Thereby, the guardian can confirm the place of the child when he wants to know.
JP 2004-46458 A JP 2002-209245 A

  However, in the conventional exit / exit record management system using the above-described IC card, it is possible to obtain clear information as to whether or not the facility is a managed facility, but the area to be managed is limited. For this reason, there is a problem that the location of the child cannot be grasped outside the facility to be managed such as a school.

  In addition, in the conventional position management system using the GPS described above, in order to obtain accurate position information, the mobile terminal may be near an outdoor or indoor window where radio wave reception sensitivity from the GPS satellite is good. is necessary. Therefore, for example, in the case of being in a school building or gymnasium, when the radio wave reception sensitivity from the GPS satellite is poor, it is difficult to obtain accurate position information. That is, even if a child attends school and stays in the school building, there is a problem that the guardian may not be able to correctly confirm that the child is attending school.

  The present invention has been made to solve the above-described problems, and provides a portable terminal capable of grasping appropriate position information according to the location of a management target person and a position management system using the portable terminal. For the purpose.

  A position management system according to the present invention includes a portable terminal possessed by a person to be managed, a management center for managing the position of the portable terminal, and a tag reader installed in a management area and connected to the management center using a communication line A system for grasping the position of the person to be managed based on the position of the mobile terminal, and when the mobile terminal receives the interrogation wave from the tag reader, it sends a response wave and identifies its own tag A wireless tag that transmits information to the tag reader, a GPS receiver that receives GPS signals and acquires GPS information indicating the position of the mobile terminal, and mobile communication that communicates with the management center using mobile communication And the GPS receiving unit and the mobile communication unit in accordance with the positioning instruction signal received from the management center, and acquiring the GPS information and sending it to the management center. The tag reader detects the wireless tag of the portable terminal existing in the management area, and transmits detection tag information including the tag identification information of the wireless tag to the management center. A position confirmation unit that transmits the positioning instruction signal to a portable terminal in which the wireless tag is not detected by the tag reader when the management center confirms the position of the portable terminal; And a GPS information acquisition unit that receives GPS information.

  In the position management system according to the present invention, the management center stores a reader position storage unit that stores reader position information indicating an installation location of the tag reader, and a request reception unit that receives a confirmation request for the position of the portable terminal from the outside. And, in response to the confirmation request, a position that presents the position of the portable terminal that is grasped based on the reader position information of the tag reader that detects the wireless tag of the portable terminal or the GPS information of the portable terminal And a presentation unit.

  Further, in the position management system according to the present invention, the management center manages the position of the mobile terminal using coordinate information represented by latitude and longitude, and the position presentation unit is configured to use the mobile information based on the coordinate information. It can be set as the structure which outputs the map image which displayed the position of the terminal.

  The position management device according to the present invention includes a portable terminal provided with a wireless tag and possessed by a person subject to position management, a communication unit that is installed in a management area and communicates with a tag reader that detects the wireless tag, and acquired by the portable terminal And a position information acquisition unit for acquiring terminal acquisition position information indicating the position of the mobile terminal via the communication unit, and detection tag information indicating a detection state of the wireless tag of the mobile terminal by the tag reader, When detecting the detection state acquisition unit acquired via the communication unit and the position of the target person, the presence / absence of detection of the wireless tag of the mobile terminal by the tag reader is determined based on the detection tag information. A position confirmation unit that causes the position information acquisition unit to acquire the terminal acquisition position information of the mobile terminal in a non-detection state; and a detection status of the wireless tag of the mobile terminal by the tag reader Or on the basis of the terminal obtains position information, and includes a position presenting unit for presenting the location information of the subject.

  According to the present invention, when the wireless tag provided in the portable terminal detects a radio wave transmitted from the tag reader, it responds to this. The management center acquires detection tag information from the tag reader and monitors the detection state of the wireless tag. When it is necessary to grasp the position of the mobile terminal, the management center grasps the position of the mobile terminal from the position of the wireless tag if the wireless tag of the mobile terminal is detected. On the other hand, if the wireless tag is not detected, the management center sends a positioning instruction to the mobile terminal using mobile communication, acquires GPS information from the mobile terminal, and grasps the position of the mobile terminal. Thus, the management center can basically always grasp the location of the mobile terminal by an appropriate method based on either the information from the tag reader or the GPS information from the mobile terminal. In addition, since the GPS function is operated only when necessary, accurate position management can be performed while suppressing power consumption in the mobile terminal.

  Hereinafter, embodiments of the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.

  The present embodiment is a position management system in which a child who is a management target has a wireless terminal (RFID tag) and a portable terminal equipped with a GPS function, and the position is grasped by a management center. The location of the child ascertained by the management center is provided to an administrator terminal such as a guardian as necessary.

  FIG. 1 is a schematic diagram showing a schematic configuration of the present position management system. This system includes a mobile terminal 2, a tag reader 4, and a management center 6. The mobile terminal 2 has a GPS function as described above, and can receive a transmission signal (GPS signal) from the GPS satellite 8. Moreover, the portable terminal 2 can perform mobile communication. The tag reader 4 and the management center 6 are configured to be communicable via a network 10 such as a public line network. Also connected to the network 10 are a mobile communication base station 12, a GPS reference station 14, and an administrator terminal 16.

  The tag reader 4 is arranged on each floor of an elementary school building 20 and a gymnasium 22 and a learning school 24 which are management facilities using wireless tags.

  The management center 6 includes a communication server 30, a positioning server 32, a tag management server 34, and a position management server 36. In this system, an example in which the functions of the management center 6 are configured by a plurality of servers 30 to 36 connected to each other via a LAN (Local Area Network) 38 or the like is shown. Can be realized on a single computer.

  Hereinafter, the structure and function of the main components of the system will be described individually.

  FIG. 2 is a block diagram illustrating a schematic configuration of the mobile terminal 2. The mobile terminal 2 includes a wireless tag 40, a wireless communication unit 42, a storage unit 44, a control unit 46, and a battery 48.

  The wireless tag 40 performs wireless communication with the tag reader 4. Specifically, the wireless tag 40 stores a tag ID as an identification code (tag identification information) that allows the wireless tag 40 to identify itself from other wireless tags, and when receiving a query wave of a predetermined frequency from the tag reader 4, A response wave modulated based on the tag ID is sent out. The wireless tag 40 can be attached to, for example, the surface of the mobile terminal 2, the storage space for the battery 48, an empty space for an internal circuit, and the like.

  The wireless communication unit 42 includes a base station communication unit 50 and a GPS reception unit 52. The base station communication unit 50 is a mobile communication unit that performs wireless communication with the base station 12, and the mobile terminal 2 communicates with the management center 6 via the base station 12 and the network 10 by the base station communication unit 50. It can be carried out. The GPS receiver 52 receives a GPS signal from the GPS satellite 8 and acquires GPS information corresponding to its current position.

  The control unit 46 performs communication control by the base station communication unit 50 and drive control of the GPS reception unit 52. When receiving a positioning instruction signal from the management center 6 via the base station communication unit 50, the control unit 46 controls the GPS reception unit 52 and the base station communication unit 50 to acquire GPS information and to manage the information in the management center 6 Send to.

  The storage unit 44 stores various control programs used by the control unit 46, identification information for identifying itself, and the like. The identification information stored by the storage unit 44 includes, for example, a terminal ID assigned to the mobile terminal 2 and a communication address.

  The battery 48 is a built-in power supply that supplies driving power to each unit of the mobile terminal 2.

  Next, the tag reader 4 will be described. The tag reader 4 is installed in a management facility such as the school building 20, the gymnasium 22, and the learning school 24 as described above. The tag reader 4 detects the wireless tag 40 in the management facility area as a management target area. Each tag reader 4 detects the wireless tag 40 by transmitting an interrogation wave to the surrounding management target area where the tag reader 4 is installed, and detecting a response wave from the wireless tag 40 corresponding thereto. In order to cover the inside of the management facility without omission, a plurality of tag readers 4 may be installed according to the size of the management facility.

  The interrogation wave is a radio wave having a predetermined carrier frequency used in the RFID system, and the size of each management target area of the tag reader 4 varies depending on the carrier frequency. In this system, wireless communication between the tag reader 4 and the wireless tag 40 of the portable terminal 2 is basically performed in a non-contact manner, and the carrier frequency is also set to a frequency band adapted to this. Furthermore, from the viewpoint that a relatively large management target area is covered with a small number of tag readers 4, it is preferable to use a frequency at which communication is possible even if the distance between the tag reader 4 and the wireless tag 40 is relatively large. , UHF band can be used.

  The tag reader 4 demodulates the response wave, acquires the tag ID of the wireless tag 40 that transmitted the response wave, and stores the tag ID of the wireless tag 40 whose presence is currently detected in the management target area. In this system, since it is assumed that there are a plurality of children in the management target area of one tag reader 4, it is preferable to use the tag reader 4 having an anti-collision function (multiple simultaneous reading function). This makes it possible to acquire tag IDs from a plurality of wireless tags 40 existing in the management target area all at once and without omission.

  For example, when a change occurs in the storage content of the detected tag ID, the tag reader 4 sends the detected tag information including the currently detected tag ID and the reader ID that is identification information of the tag reader 4 via the network 10. Transmit to the management center 6. Note that the information related to the tag ID included in the detection tag information is, for example, a detection tag that is newly detected after the previous transmission or can no longer be detected instead of information that directly represents all the tag IDs that are currently detected. It can also be information relating to a change in ID.

  As a countermeasure against the possibility that the detection tag ID may change unnecessarily due to a reading error in the tag reader 4 or the like, the detection / non-detection state of an arbitrary wireless tag 40 is kept constant by a predetermined number of reading attempts. On this condition, the detection state of the wireless tag 40 can be determined and the change can be determined.

  In this system, each tag reader 4 can be configured to individually transmit the detected tag information to the management center 6. On the other hand, it is also possible to employ a configuration in which a reader management terminal for centrally managing a plurality of tag readers 4 existing in an area of the unit is provided for each unit of a management facility such as an elementary school or a learning cram school. In this configuration, the reader management terminal collects the detection tag information of the plurality of tag readers 4 and transmits them together to the management center 6.

  As described above, the management center 6 includes the communication server 30, the positioning server 32, the tag management server 34, and the position management server 36.

  The communication server 30 is connected to the network 10 and executes communication with the outside as necessary. As user information that can be used for communication, the communication server 30 makes a user ID for identifying a child, a terminal ID of the portable terminal 2 possessed by the child, a tag ID of the wireless tag 40 attached to the portable terminal 2, and a position confirmation request. A password for authenticating the guardian is stored.

  FIG. 3 is a block diagram showing a schematic configuration of the positioning server 32. The positioning server 32 includes a control unit 70, a storage unit 72, and a communication interface 74. The control unit 70 includes a positioning calculation unit 76, and the storage unit 72 stores mobile terminal information, GPS satellite information, positioning result information, and the like. The communication interface 74 controls communication with each unit of the management center 6 via the LAN 38.

  The positioning server 32 periodically acquires GPS satellite information related to the position of the GPS satellite 8 from the GPS reference station 14 and stores it in the storage unit 72.

  In addition, when the positioning server 32 receives a positioning request for the mobile terminal 2 from the position management server 36, the positioning server 32 transmits a positioning instruction signal to the mobile terminal 2. Then, the positioning server 32 receives GPS information from the mobile terminal 2. Based on the received GPS information and the GPS satellite information stored in the storage unit 72, the positioning calculation unit 76 performs a positioning calculation on the mobile terminal 2 that has transmitted the GPS information to calculate position information. This position information indicates the position of the mobile terminal 2 by, for example, latitude and longitude. The positioning server 32 stores the position information of the mobile terminal 2 obtained by the positioning calculation unit 76 in the storage unit 72 as positioning result information in association with the terminal ID of the mobile terminal 2. Further, the positioning server 32 transmits positioning result information to the position management server 36. As described above, the positioning server 32 functions as a position information acquisition unit (GPS information acquisition unit) that acquires terminal acquisition position information (GPS information) of the mobile terminal 2.

  FIG. 4 is a block diagram showing a schematic configuration of the tag management server 34. The tag management server 34 includes a control unit 80, a storage unit 82, and a communication interface 84. The control unit 80 includes a detection information update unit 86, and the storage unit 82 stores tag reader information, detection state information, and the like. The communication interface 84 controls communication with each unit of the management center 6 via the LAN 38.

  FIG. 5 is an explanatory diagram schematically showing the structure of the detection state information. The detection state information is information indicating the detection state of the wireless tag 40 by the tag reader 4, and for each tag ID, the reader ID of the tag reader 4 that detects the tag ID or that the tag ID is not detected. Information is associated. In FIG. 5, “TGn” (n is a number) represents a tag ID, and “RDn” (n is a number) represents a reader ID.

  The tag management server 34 functions as a detection state acquisition unit that receives detection tag information from the tag reader 4, and the detection information update unit 86 updates the detection state information based on the received detection tag information. For example, if the detection tag information received from the tag reader 4 of RD01 indicates that TG02 is detected, the detection information update unit 86 changes the detection state of TG02 from “non-detection” shown in FIG. Change to “Medium / RD01”. If the detected tag information received from the tag reader 4 of RD03 indicates that TG01 has not been detected, the detection state of TG01 is changed from “Detecting / RD03” shown in FIG. 5 to “Not detected”. .

  The tag management server 34 transmits to the location management server 36 the tag ID that has changed the detection state and the detection state after the change in conjunction with the update of the detection state information.

  FIG. 6 is a block diagram showing a schematic configuration of the location management server 36. The location management server 36 includes a control unit 90, a storage unit 92, and a communication interface 94. The control unit 90 includes an acquisition position update unit 96, a position confirmation unit 98, and a position presentation unit 100, and a storage unit 92 stores reader position information, acquisition position information, map information, and the like. The communication interface 94 controls communication with each unit of the management center 6 via the LAN 38.

  FIG. 7 is an explanatory diagram schematically showing the structure of the reader position information. The reader position information is information indicating the installation location of the tag reader 4. In the storage unit 92, for each tag reader 4 installed, a reader ID, an installation location name, and latitude / longitude information of the installation location are associated with each other and registered in advance. The reader position information is used when the position of the mobile terminal 2 is specified by the installation location of the tag reader 4 that detects the wireless tag 40 attached to the mobile terminal 2.

  FIG. 8 is an explanatory diagram schematically showing the structure of acquired position information. The acquired position information stores position information (terminal position information) acquired for the portable terminal 2 possessed by the child. As the terminal position information, the tag position information of the wireless tag 40 specified using the reader position information or the position information of the portable terminal 2 calculated by the positioning server 32 based on the GPS information from the portable terminal 2 is used. The acquired position information is managed for each user ID, and the acquired position information of each user ID is updated as needed based on the newly acquired terminal position information. In the present system, as shown in FIG. 8, the acquired position information is configured to hold the past recorded contents, for example, for a predetermined period and manage the history. The information recorded corresponding to each user ID includes, for example, a tag ID or terminal ID, acquisition time, latitude / longitude information, and a place name, as shown in FIG. Here, if the terminal position information is based on the tag position information, the tag ID is recorded in the data field for recording the tag ID or the terminal ID, while the terminal position information is calculated by the positioning server 32. If it is based on the location information of the mobile terminal 2, the terminal ID is recorded. Incidentally, FIG. 8 shows an example in which the history of terminal position information is composed only of information based on tag position information. In the place name data field, when the terminal position information is based on the tag position information, an installation place name of the tag reader 4 that has detected the wireless tag 40 is recorded.

  When the acquisition position update unit 96 receives the positioning result information from the positioning server 32, the position information of the mobile terminal 2 represented by the terminal ID and the latitude / longitude included in the positioning result information, and the acquisition times thereof Are stored in the storage unit 92 in association with the user ID of the child who owns the mobile terminal 2.

  When the acquisition position update unit 96 receives information related to the change in the detection state of the wireless tag 40, the acquisition position update unit 96 refers to the reader position information stored in the storage unit 92 and is a tag that is the position information of the wireless tag 40. Obtain location information (latitude / longitude information and location name). Specifically, the acquisition position update unit 96 determines that a new detection is being performed when the tag detection state changes from “non-detection” to “detecting” or when the tag reader 4 being detected is switched. The reader position information stored in the storage unit 92 is searched using the reader ID of the tag reader 4 that has become a key, and the latitude / longitude information and the installation location name of the tag reader 4 are determined as the tag position information of the wireless tag 40. On the other hand, when the detection state of the tag is changed from “being detected” to “not detected”, “lost” indicating that the tag is not detected as, for example, latitude / longitude information in the tag position information of the wireless tag 40. Define The acquisition position update unit 96 corresponds to the user ID of the child who owns the mobile terminal 2 to which the wireless tag 40 is attached, with the tag ID and tag position information in which the change of the detection state is detected, and the acquisition time thereof. At the same time, it is recorded in the storage unit 92.

  FIG. 9 is a schematic flowchart for explaining the processing of the position confirmation unit 98. The control unit 90 functions as a request accepting unit that accepts a confirmation request regarding the position of the mobile terminal 2 from the outside, and activates the position confirming unit 98 when the confirmation request is accepted. The position confirmation request is issued when a child guardian confirms the position of the child. The guardian operates the administrator terminal 16 and transmits a position confirmation request. For example, the administrator terminal 16 can be a personal computer or a mobile phone. Incidentally, the position confirmation request can be configured to be performed by designating a user ID for identifying a child.

  The position confirmation unit 98 refers to the latest recorded content of the acquired position information in the storage unit 92 for the portable terminal 2 that is the target of the position confirmation request (S110), and whether the wireless tag 40 of the portable terminal 2 is in the non-detected state It is determined whether or not (S112).

  If the latest recorded content of the acquired position information is not “lost”, the wireless tag 40 is being detected (“No” in S112). In this case, the position confirmation unit 98 extracts tag position information which is the recorded content (S114). A map image displaying the position of the mobile terminal 2 based on the tag position information is created by the position presentation unit 100 with reference to the map information in the storage unit 92 (S116). For example, the map image is sent to the administrator terminal 16 that is the transmission source of the position confirmation request, and is displayed on the display device. The guardian is notified of the current position of the child carrying the portable terminal 2 by the map image (S118).

  When the recorded content referred to in the process S110 indicates “lost”, the wireless tag 40 is in a non-detection state (“Yes” in S112). In this case, the position confirmation unit 98 requests positioning to the positioning server 32, and the positioning server 32 transmits a positioning instruction signal to the portable terminal 2 (S120). When the mobile terminal 2 transmits GPS information in response to the positioning instruction signal, the positioning server 32 performs positioning calculation, and the position confirmation unit 98 acquires positioning result information from the positioning server 32 (“Yes” in S122). ). In this case, the position presentation unit 100 creates a map image displaying the position of the mobile terminal 2 based on the positioning result (S116), and notifies the current position of the child to the guardian (S118).

  On the other hand, if the portable terminal 2 does not transmit GPS information in response to the positioning instruction signal, positioning result information cannot be acquired (“No” in S122). In this case, the position of the child cannot be confirmed by any of the wireless tag 40 and the GPS function of the mobile terminal 2. Therefore, the position confirmation unit 98 determines that this state is an abnormal state (S124). For example, an abnormality has occurred with respect to a child's guardian or the school or school where the wireless tag 40 was last lost. Appropriate measures such as notification of the last location / time information are executed (S126).

  In the above-described configuration, the position of the mobile terminal 2 when the tag reader 4 detects the wireless tag 40 is expressed by latitude and longitude in the same manner as the positioning result information based on the GPS information by using the reader position information. Coordinate information. Thus, even when the position is grasped by either the wireless tag 40 or the GPS function, the information is managed in a unified information format called coordinate information. And even if it is the positional information acquired by any system, the said position is similarly shown by a map image and the unified user interface is implement | achieved. On the other hand, since the tag reader 4 is arranged in a predetermined management facility, if the tag reader 4 detects it, it is possible to grasp the position and the state of no abnormality just by indicating the detected state, and the display of the display It can be simplified. Therefore, in this case, the management facility name or the like in which the tag reader 4 detecting the wireless tag 40 is simply or in combination with the map information may be presented to the guardian.

  As described above, in this system, when the wireless tag 40 of the mobile terminal 2 cannot be detected by the tag reader 4, the position management server 36 acquires the position information using the GPS function of the mobile terminal 2. The position of the child can be continuously grasped by the wireless tag 40 and the GPS function of the portable terminal 2. Further, since the position information can be acquired by an appropriate method according to the child's whereabouts, such as the wireless tag 40 indoors and the GPS function outdoors, highly accurate and highly reliable position management is possible. Furthermore, the position information by the wireless tag 40 and the position information by the GPS function can be provided to the guardian in a unified manner using the same system.

It is a schematic diagram which shows the structure of the outline of the position management system which concerns on embodiment of this invention. It is a block diagram which shows the schematic structure of the portable terminal in the position management system which concerns on embodiment of this invention. It is a block diagram which shows the structure of the outline of a positioning server. It is a block diagram which shows the schematic structure of a tag management server. It is explanatory drawing which represents the structure of detection state information typically. It is a block diagram which shows the structure of the outline of a position management server. It is explanatory drawing which represents typically the structure of reader position information. It is explanatory drawing which represents the structure of acquisition position information typically. It is a schematic flowchart explaining the process of a position confirmation part.

Explanation of symbols

  2 mobile terminal, 4 tag reader, 6 management center, 8 GPS satellite, 10 network, 12 base station, 14 GPS reference station, 16 administrator terminal, 20 school building, 22 gymnasium, 24 learning school, 30 communication server, 32 positioning server, 34 Tag management server, 36 Location management server, 38 LAN, 40 wireless tag, 42 wireless communication unit, 44, 72, 82, 92 storage unit, 46, 70, 80, 90 control unit, 48 battery, 50 base station communication unit, 52 GPS receiving unit, 74, 84, 94 communication interface, 76 positioning calculation unit, 86 detection information update unit, 96 acquisition position update unit, 98 position confirmation unit, 100 position presentation unit.

Claims (4)

A mobile device owned by a managed person,
A management center for managing the location of the mobile terminal;
A tag reader installed in a management area and connected to the management center using a communication line;
A position management system for grasping the position of the person to be managed by the position of the mobile terminal,
The portable terminal is
When the interrogation wave is received from the tag reader, a wireless tag that transmits a response wave and transmits its tag identification information to the tag reader;
A GPS receiver that receives GPS signals and obtains GPS information representing the position of the mobile terminal;
A mobile communication unit that communicates with the management center using mobile communication;
A control unit that controls the GPS receiving unit and the mobile communication unit in accordance with a positioning instruction signal received from the management center, acquires the GPS information, and transmits the GPS information to the management center;
With
The tag reader detects the wireless tag of the mobile terminal existing in the management area, transmits detection tag information including the tag identification information of the wireless tag to the management center,
The management center
A position confirmation unit that transmits the positioning instruction signal to a portable terminal in which the wireless tag is not detected by the tag reader when confirming the position of the portable terminal;
A GPS information acquisition unit that receives the GPS information from the mobile terminal;
A position management system comprising: The management center
A reader position storage unit that stores reader position information indicating an installation location of the tag reader;
A request accepting unit that accepts a confirmation request about the position of the mobile terminal from the outside;
In response to the confirmation request, a position presentation unit that presents the position of the portable terminal that is grasped based on the reader position information of the tag reader that detects the wireless tag of the portable terminal or the GPS information of the portable terminal When,
The position management system according to claim 1, comprising: The management center manages the position of the mobile terminal by coordinate information represented by latitude and longitude,
The position presentation unit outputs a map image displaying the position of the mobile terminal based on the coordinate information;
The position management system according to claim 2. A communication unit that communicates with a portable terminal that is equipped with a wireless tag and is possessed by a position management target person and a tag reader that is installed in a management area and detects the wireless tag;
A position information acquisition unit that acquires the terminal acquisition position information acquired by the mobile terminal and indicating the position of the mobile terminal via the communication unit;
A detection state acquisition unit for acquiring detection tag information representing a detection state of the wireless tag of the portable terminal by the tag reader via the communication unit;
When confirming the position of the target person, based on the detection tag information, the tag reader determines whether the mobile terminal detects the wireless tag, and the position information acquisition unit is in a non-detection state. A position confirmation unit that causes the terminal to acquire the terminal acquisition position information of the mobile terminal;
A position presentation unit that presents the position information of the target person based on the detection state of the wireless tag of the portable terminal in the tag reader or the terminal acquisition position information;
A position management device comprising:

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