JP5652256B2 - Mobile device and program - Google Patents

Description

  The present invention relates to a mobile device and a program.

  Conventionally, when a wireless local area network (LAN) is introduced into a facility such as a warehouse, a site survey has been known in which an access point for relaying wireless communication is temporarily installed in the facility and its radio wave environment is examined. Yes. Site surveys can be used to install access points where radio wave conditions improve.

  In a conventional site survey, an investigator uses a special device (measuring instrument) to operate while looking at the screen of the device, and measures the radio wave environment at a plurality of locations.

  As the special device, there is known a wireless LAN automatic site survey device in which a small terminal having a display, an antenna, and angular velocity and vehicle speed sensors are mounted on a carriage (see, for example, Patent Document 1). The electric field strength, the angular velocity, and the vehicle speed are measured while running the carriage in the measurement area of the site survey, and a two-dimensional electric field strength distribution is obtained according to the measurement information.

JP 2006-125951 A

  However, the conventional site survey requires a special special device, and the investigator has to operate while looking at the screen of the device, which has a heavy work load and a long work time.

  An object of the present invention is to simplify the configuration of an apparatus for site survey, to reduce the work burden on a user who performs a site survey, and to shorten the work time.

In order to solve the above-described problem, the mobile device of the present invention receives a radio wave from an access point installed in a site subject to site survey, and detects a radio wave state detection unit that detects state information of the received radio wave.
A motion sensor that detects acceleration information and orientation information of the own device, and calculates position information of a user holding the own device from the acceleration information and orientation information;
A control unit that stores the position information of the user calculated by the motion sensor in a storage unit in association with the state information of the radio wave detected by the radio wave state detection unit;
A reading unit that reads identification information of an RFID tag arranged at a position in the vicinity of a stop position of a user holding the device,
The storage unit stores identification information of the RFID tag and position information of a stop position corresponding to the RFID tag in association with each other,
The motion sensor outputs stop information indicating that the user holding the own device is stopped according to the detected acceleration information and azimuth information when the own device is stopped,
The control unit determines whether the user has stopped according to the stop information output from the motion sensor, the user has stopped, and the RFID tag identification information has been read by the reading unit Position information stored in the storage unit corresponding to the read identification information, and the position information stored in association with the radio wave state information in the storage unit by the read position information. Correct .

  ADVANTAGE OF THE INVENTION According to this invention, while being able to simplify the structure of the apparatus for site surveys, the work burden of the user who performs a site survey can be reduced, and work time can be shortened.

It is a block diagram which shows the structure of the portable apparatus of embodiment of this invention. It is a figure which shows the structure of a position information table. It is a figure which shows arrangement | positioning of the shelf in the warehouse which performs a site survey, an access point, and an RFID tag. It is a flowchart which shows a site survey process. It is a figure which shows the image of the electromagnetic wave intensity in the warehouse which performed the site survey.

  Embodiments according to the present invention will be described below in detail with reference to the accompanying drawings. The present invention is not limited to the illustrated example.

  First, the apparatus configuration of the present embodiment will be described with reference to FIG. FIG. 1 shows a configuration of a mobile device 10 according to the present embodiment.

  As shown in FIG. 1, the mobile device 10 of the present embodiment is a handy terminal that reads and manages information of an RFID tag 30 as a reading object. The RFID tag 30 is attached to, for example, equipment or products arranged in a facility such as a warehouse or a retail store.

  The portable device 10 has a communication function for performing wireless communication with the access point 40 installed in the facility. The mobile device 10 has a function of assisting a site survey before the access point 40 is officially installed and operated in the facility. In the present embodiment, an example in which the mobile device 10 is used in a warehouse as an indoor facility and a site survey in the warehouse is performed will be described.

  In the present embodiment, since the site survey target is a warehouse as an indoor facility, position information input by GPS (Global Positioning System) cannot be applied to position information acquisition in the site survey. Therefore, in the present embodiment, position information input using the motion sensor 19 is performed for position information acquisition in the site survey.

  The RFID tag 30 is assumed to be an electromagnetic induction type RFID tag. The RFID tag 30 includes a communication unit including a coil antenna, a control unit, and an EEPROM (Electrically Erasable Programmable Read Only Memory). In the RFID tag 30, the control unit performs wireless communication with the portable device 10 via the electromagnetic field by the communication unit, reads out data stored in the EEPROM in response to a read request from the received portable device 10, and the portable device. 10 to send. The control unit of the RFID tag 30 writes or rewrites data received from the mobile device 10 in the EEPROM.

  It is assumed that individual identification information for identifying the RFID tag 30 is stored in the EEPROM of the RFID tag 30. In addition, the RFID tag 30 is a passive RFID tag that obtains power by an electromagnetic field from the mobile device 10, but may also be an active RFID tag that has a power supply unit and outputs an electromagnetic field by the power of the power supply unit. Good.

  The access point 40 performs wireless communication with the mobile device 10. The access point 40 is connected to a wired LAN and communicates with devices on the wired LAN. The access point 40 has a function of relaying communication between the device on the wired LAN and the mobile device 10.

  The mobile device 10 includes a CPU (Central Processing Unit) 11, an operation unit 12, a RAM (Random Access Memory) 13, a display unit 14, a ROM (Read Only Memory) 15, a wireless communication unit 16, and a flash memory. 17, an RFID reader / writer unit 18, a motion sensor 19, a notification unit 20, and a power supply unit 21. Each part of the portable device 10 except for the power supply unit 21 is connected to each other via a bus 22.

  The CPU 11 controls each unit of the mobile device 10. The CPU 11 reads a designated program out of various programs from the ROM 15 and expands it in the RAM 13 and executes various processes in cooperation with the expanded program.

  In accordance with the site survey program 151, the CPU 11 flashes the position information of the user holding the mobile device 10 calculated by the motion sensor 19 in association with the radio wave intensity information as the radio wave state information detected by the radio communication unit 16. Store in the memory 17. Then, the CPU 11 determines whether or not the user has stopped according to the stop information output from the motion sensor 19. The user stops, and the RFID reader / writer unit 18 determines the individual identification information of the RFID tag 30. When read, the position information 52 of the position information table 50 is read corresponding to the individual identification information. Then, the CPU 11 corrects the position information stored in association with the radio wave intensity information of the flash memory 17 with the read position information 52.

  The operation unit 12 includes a key group including various keys such as a character input key, and outputs operation information corresponding to a pressing input of each key from the user to the CPU 11.

  The RAM 13 is a volatile semiconductor memory and has a work area for storing various data and various programs.

  The display unit 14 includes a display panel such as an LCD (Liquid Crystal Display) or an EL (ElectroLuminescent) display, and performs various displays on the display panel according to display information input from the CPU 11.

  The ROM 15 is a read-only semiconductor memory that stores various data and various programs. The ROM 15 stores a site survey program 151.

  The wireless communication unit 16 is a wireless communication unit using a wireless LAN communication method. The wireless communication unit 16 includes an antenna, a modulation unit, a demodulation unit, a signal processing unit, and the like, and performs wireless communication with the access point 40. The wireless communication unit 16 processes a signal of information to be transmitted by the signal processing unit, modulates the signal by the modulation unit, and transmits the signal from the antenna to the access point 40 as a radio wave. The access point 40 is connected to a communication destination device via a wired LAN. In addition, the wireless communication unit 16 demodulates a radio wave reception signal received from the access point 40 by an antenna using a demodulation unit and performs signal processing on the signal processing unit to obtain reception information. In this way, the wireless communication unit 16 communicates with a communication destination device via the access point 40.

  In addition, the wireless communication unit 16 detects the radio wave intensity information that is the state information of the radio wave received from the access point 40 and outputs it to the CPU 11. The radio field strength information is, for example, an RSSI (Received Signal Strength Indication) value.

  The flash memory 17 is a non-volatile semiconductor memory that stores information in a readable and writable manner. The flash memory 17 stores a position information table 50 described later.

  The RFID reader / writer unit 18 is an electromagnetic induction reader / writer unit that reads and writes information stored in the RFID tag 30. The RFID reader / writer unit 18 includes a coil antenna, a modulation unit, a demodulation unit, a signal processing unit, and the like. The RFID reader / writer unit 18 processes the electrical signal of the transmission data input from the CPU 11 by the signal processing unit, modulates the signal by the modulation unit, and outputs the signal as an electromagnetic field from the coil antenna. The RFID tag 30 receives data via the electromagnetic field output from the RFID reader / writer unit 18 and outputs data transmitted to the RFID reader / writer unit 18 via the electromagnetic field. The RFID reader / writer unit 18 receives data by the coil antenna via the electromagnetic field output from the RFID tag 30, demodulates the electrical signal of this data by the demodulation unit, processes the signal by the signal processing unit, and receives the data. To do.

  The motion sensor 19 is a sensor that detects movement and orientation information of the mobile device 10. The motion sensor 19 includes an acceleration sensor 191, a ground axis sensor 192, and a control unit (CPU) 193. The acceleration sensor 191 is a three-dimensional acceleration sensor that detects acceleration in the three-axis direction of the three-dimensional space. The earth axis sensor 192 is a sensor that detects an orientation on the earth. The control unit 193 uses the three-dimensional acceleration information detected by the acceleration sensor 191 and the azimuth information detected by the earth axis sensor 192 to calculate position information on the horizontal plane of the portable device 10 (the user who holds the portable device 10). And output to the CPU 11. In addition, when the mobile device 10 (the user who holds the mobile device 10) is stopped, the control unit 193 responds to the three-dimensional acceleration information detected by the acceleration sensor 191 and the azimuth information detected by the ground axis sensor 192. Then, stop information (for example, a signal of 0) indicating that the portable device 10 (the user holding it) is stopped is output to the CPU 11.

  The alerting | reporting part 20 is a vibrator which alert | reports to a user by generating a vibration according to control of CPU11. Note that the notification unit 20 may be a sound generator such as a buzzer or a speaker that notifies the user by generating sound according to the control of the CPU 11. Further, the notification unit 20 may include both a vibrator and a sound generator.

  The power supply unit 21 is a secondary battery such as a lithium battery, and supplies power to each unit of the mobile device 10. The power supply unit 21 may be a primary battery such as an alkaline battery.

  Next, information stored in the mobile device 10 will be described with reference to FIGS. 2 and 3. FIG. 2 shows the configuration of the position information table 50. FIG. 3 shows the arrangement of shelves, access points, and RFID tags in a warehouse that conducts a site survey.

  The flash memory 17 stores a position information table 50 shown in FIG. The position information table 50 has fields of individual identification information 51 and position information 52. The individual identification information 51 is individual identification information for identifying the RFID tag 30 arranged in advance for the purpose of position correction in the facility during the site survey. The position information 52 is position information of a stop position where the user stops at the site survey corresponding to the position in the facility where the RFID tag 30 corresponding to the individual identification information 51 is arranged. Further, it is assumed that the position information 52 corresponding to the individual identification information 51 of the RFID tag 30 arranged at the end point of the flow line of the site survey includes information indicating the end point.

  For example, as shown in FIG. 3, a case where a site survey is performed in a warehouse as an indoor facility where shelves 61, 62, and 63 are installed will be described. A flow line L for site survey is set in the warehouse. The flow line L is a line segment from the start position P0 to the end position E, and is a path on which the user holding the mobile device 10 walks during the site survey. The flow line L is set so as to include a passage through which the user using the mobile device 10 passes after the operation of the wireless LAN communication in the warehouse. On the flow line L, stop positions P1, P2, P3, P4, P5, and P6 at which the user stops are set at points where the user using the mobile device 10 turns right or left.

  RFID tags 31, 32, 33, 34, 35, 36, and 37 are installed at the positions of nearby shelves 61, 62, and 63 that correspond to the stop positions P 1, P 2, P 3, P 4, P 5, P 6, and the end position E, respectively. Has been. The RFID tags 31, 32, 33, 34, 35, 36 and 37 are the same devices as the RFID tag 30.

  In the position information table 50, the individual identification information 51 stores, for example, individual identification information stored in the RFID tags 31, 32, 33, 34, 35, 36, and 37, respectively. The position information 52 stores, for example, position information of stop positions P1, P2, P3, P4, P5, P6, and end position E.

  In the warehouse, a temporary number (two) of access points 41 and 42 are installed at temporary positions for site survey. The access points 41 and 42 are the same devices as the access point 40. In the site survey, the radio wave conditions from the temporarily installed access points 41 and 42 are measured.

  Next, the operation of the mobile device 10 will be described with reference to FIGS. 4 and 5. FIG. 4 shows the site survey process. FIG. 5 shows an image of the radio field intensity in the warehouse where the site survey was conducted.

  As shown in FIG. 4, the site survey process is executed in the mobile device 10. Prior to the site survey processing, at least one RFID tag 30 is arranged in the vicinity of the stop position on the flow line where the user walks in the warehouse subject to site survey, and a temporary number of access points 40 are installed at the temporary position. It shall be. The access point 40 is installed at the position and the number of units that are expected to perform wireless LAN communication appropriately in terms of radio wave environment with the portable device 10 in the warehouse during the operation of the wireless LAN.

  In addition, a flow line in which the user walks during the site survey process is set in advance in the warehouse. In addition, a start position and a stop position and an end position in the vicinity of the RFID tag 30 are set on the flow line. For example, as shown in FIG. 3, access points 41 and 42 are arranged in a warehouse, RFID tags 31, 32, 33, 34, 35, 36, and 37 are temporarily installed, a flow line L, a start position P0, Stop positions P1, P2, P3, P4, P5, P6 and an end position E are set.

  After the installation of the access point 40 and the RFID tag 30, the CPU 11 is read from the ROM 15 in the portable device 10, for example, triggered by an input of a site survey process execution instruction from the user via the operation unit 12. The site survey processing is executed in cooperation with the site survey program 151 loaded in the RAM 13 as appropriate.

  First, the CPU 11 acquires position information or stop information of a user holding the mobile device 10 from the motion sensor 19 (step S11). Then, the CPU 11 receives the radio wave of the radio signal output from the access point 40 by the radio communication unit 16, and acquires the radio wave intensity information corresponding to the intensity of the received radio wave detected by the radio communication unit 16 from the radio communication unit 16. (Step S12). And CPU11 matches and memorize | stores the positional information and radio wave intensity | strength information of a user (mobile device 10) acquired by step S11, S12 in the flash memory 17 (step S13).

  And CPU11 discriminate | determines whether the user (mobile device 10) has stopped according to whether the stop information of the user (mobile device 10) was acquired by step S11 (step S14). When the user has not stopped (step S14; NO), the process proceeds to step S11.

  When the user is stopped (step S14; YES), the CPU 11 causes the RFID reader / writer unit 18 to output a response request electromagnetic field, and responds to the response request from the RFID tag 30 via the RFID reader / writer unit 18. Information is received (step S15). It is assumed that the response information includes individual identification information of the RFID tag 30. And CPU11 discriminate | determines whether the response information was received by step S15 (step S16).

  When the response information has not been received (step S16; NO), the process proceeds to step S11. When the response information is received (step S16; YES), the CPU 11 refers to the position information table 50 stored in the flash memory 17, and the position corresponding to the individual identification information 51 included in the response information received in step S15. The information 52 is read out, and whether or not the user (mobile device 10) is at the end position E is determined based on whether or not the read position information 52 includes information indicating the end position (step S17).

  When the user is not at the end position E (step S17; NO), the CPU 11 corrects the position information stored in the flash memory 17 at step S13 with the position information 52 read at step S17 (step S18). Then, the CPU 11 causes the notification unit 20 to notify the user of the completion of correction of the position information by vibration (step S19), and proceeds to step S14. The vibration of the notification unit 20 can notify the user that the correction of the position information is completed at the stop position on the flow line. Note that the notification unit 20 may notify the user by sound. If the user is at the end position E (step S17; YES), the site survey process ends.

  By executing the site survey process, radio wave intensity information and position information are obtained as measurement results and stored in the flash memory 17. As shown in FIG. 5, for example, in the warehouse shown in FIG. 3, radio wave intensity information of radio waves output from the access points 41 and 42 on the flow line L is obtained as a measurement result. A strong radio field intensity is obtained in the vicinity of the access points 41 and 42 between the start position P0 and the end position E. As the radio wave intensity approaches the access points 41 and 42, the stronger the radio wave intensity is obtained.

  The measurement result by the execution of the site survey process is radio wave intensity information corresponding to the position information on the flow line L. Based on the radio wave intensity information, circular or annular regions 71 and 72 for each stepwise radio wave intensity. , 73, 74, 75, 76 can be estimated. The areas 71, 72, and 73 are approximately centered on the access point 41. Regions 74, 75, and 76 are substantially centered on access point 42. Moreover, some areas of the areas 73, 75, and 76 overlap. Regions 71 and 74 are regions where the radio wave intensity is high. Regions 72 and 75 are regions where the radio field intensity is medium. Regions 73 and 76 are regions where the radio wave intensity is low. In addition, the region 77 other than the regions 71, 72, 73, 74, 75, and 76 is a region that can be regarded as having almost no radio wave intensity.

  The site survey process is repeatedly executed with the number and position of the access points 40 changed. Then, the number of access points 40 that provide a good radio wave environment obtained by the site survey process is formally installed at an appropriate position, and the operation of the wireless LAN is started.

  As described above, according to the present embodiment, the mobile device 10 flashes the location information of the user holding the mobile device 10 calculated by the motion sensor 19 in association with the radio wave intensity information detected by the wireless communication unit 16. Store in the memory 17. Therefore, the configuration of the mobile device 10 as the site survey device can be simplified, and the user who performs the site survey walks (and stops) on the flow line by putting the mobile device 10 in the breast pocket or holding it. ), The work burden on the user can be reduced and the work time can be shortened.

  Further, the mobile device 10 determines whether or not the user has stopped according to the stop information output from the motion sensor 19, and the user stops and the RFID reader / writer unit 18 uses the individual identification information of the RFID tag 30. Is read from the flash memory 17 in correspondence with the individual identification information. Then, the portable device 10 corrects the position information stored in association with the radio wave intensity information of the flash memory 17 with the read position information 52. For this reason, accurate user position information by correction can be acquired.

  In addition, when the position information is corrected, the portable device 10 causes the notification unit 20 to notify that the position information has been corrected by vibration. For this reason, the user can recognize easily and reliably that the position information has been corrected at the stop position.

  Also, the mobile device 10 acquires and stores user position information and radio wave intensity information corresponding to the start position P0, triggered by the input of an instruction to execute site survey processing via the operation unit 12. To start. For this reason, it is possible to easily register the position information of the start position P0.

In the above description, the example in which the ROM 15 is used as the computer-readable medium of the program according to the present invention is disclosed, but the present invention is not limited to this example.
As other computer-readable media, a non-volatile memory such as a flash memory and a portable recording medium such as a CD-ROM can be applied.
A carrier wave is also applied to the present invention as a medium for providing program data according to the present invention via a communication line.

  The description in the above embodiment is an example of the portable device and the program according to the present invention, and the present invention is not limited to this.

  In the said embodiment, although the portable apparatus 10 was set as the structure which is a handy terminal, it is not limited to this. The portable device 10 may be configured to use other portable devices such as a PDA having a function of reading information from an RFID, a cellular phone, and a portable personal computer.

  In the above embodiment, the RFID tag 30 includes an RFID card (non-contact IC card).

  In the above embodiment, the configuration in which the RFID tag 30 and the RFID reader / writer unit 18 are electromagnetic induction type RFID tags and the RFID reader / writer unit has been described. However, the present invention is not limited to this. The RFID tag 30 and the RFID reader / writer unit 18 may be a radio wave type RFID tag and RFID reader / writer unit.

  Moreover, in the said embodiment, although the alerting | reporting part 20 was set as the vibrator which alert | reports the completion of correction | amendment of position information by at least one of a vibration and a sound, it is not limited to this. The notification unit 20 may be configured to notify the user of completion of correction of position information by voice output, lighting of an LED (Light Emitting Diode), information display, or the like.

  Moreover, in the said embodiment, although the radio | wireless communication part 16 was set as the structure which detects electromagnetic wave intensity information as electromagnetic wave state information, it is not limited to this. As radio wave state information, other radio wave state information such as radio wave SNR (Signal-Noise Ratio) may be detected. Further, the mobile device may add the access point identification information received from the access point to the measurement result of the survey (radio wave state information, user (mobile device) position information) during the site survey.

  In addition, it is needless to say that the detailed configuration and detailed operation of each component of the mobile device 10 in the above embodiment can be appropriately changed without departing from the gist of the present invention.

Although the embodiments of the present invention have been described, the scope of the present invention is not limited to the above-described embodiments, but includes the scope of the invention described in the claims and the equivalents thereof.
The invention described in the scope of claims attached to the application of this application will be added below. The item numbers of the claims described in the appendix are as set forth in the claims attached to the application of this application.
[Appendix]
<Claim 1>
A radio wave state detection unit that receives radio waves from an access point installed in a site subject to site survey and detects state information of the received radio waves;
A motion sensor that detects acceleration information and orientation information of the own device, and calculates position information of a user holding the own device from the acceleration information and orientation information;
And a control unit that stores the position information of the user calculated by the motion sensor in a storage unit in association with the state information of the radio wave detected by the radio wave state detection unit.
<Claim 2>
A reading unit that reads identification information of an RFID tag arranged at a position in the vicinity of a stop position of a user holding the device;
The storage unit stores identification information of the RFID tag and position information of a stop position corresponding to the RFID tag in association with each other,
The motion sensor outputs stop information indicating that the user holding the own device is stopped according to the detected acceleration information and azimuth information when the own device is stopped,
The control unit determines whether the user has stopped according to the stop information output from the motion sensor, the user has stopped, and the RFID tag identification information has been read by the reading unit Position information stored in the storage unit corresponding to the read identification information, and the position information stored in association with the radio wave state information in the storage unit by the read position information. The mobile device according to claim 1, wherein:
<Claim 3>
An informing unit for informing,
The portable device according to claim 2, wherein when the position information is corrected, the control unit causes the notification unit to notify that the position information has been corrected.
<Claim 4>
It has an operation unit that accepts site survey execution instruction input,
The said control part starts acquisition and storage of the said user's positional information and the said electromagnetic wave state information, when the execution instruction | indication of a site survey is input into the said operation part. The portable device described.
<Claim 5>
Computer
A radio wave state detection unit that receives radio waves from an access point installed in a site subject to site survey and detects state information of the received radio waves,
A motion sensor that detects acceleration information and direction information of the own device, and calculates position information of a user holding the own device from the acceleration information and direction information;
A control unit that stores the position information of the user calculated by the motion sensor in a storage unit in association with the state information of the radio wave detected by the radio wave state detection unit;
Program to function as.

10 Mobile device 11 CPU
12 Operation unit 13 RAM
14 Display 15 ROM
16 Wireless communication unit 17 Flash memory 18 RFID reader / writer unit 19 Motion sensor 191 Acceleration sensor 192 Ground axis sensor 193 Control unit 20 Notification unit 21 Power supply unit 22 Bus 30, 31, 32, 33, 34, 35, 36, 37 RFID tag 40 , 41, 42 Access point

Claims (4)

A radio wave state detection unit that receives radio waves from an access point installed in a site subject to site survey and detects state information of the received radio waves;
A motion sensor that detects acceleration information and orientation information of the own device, and calculates position information of a user holding the own device from the acceleration information and orientation information;
A control unit that stores the position information of the user calculated by the motion sensor in a storage unit in association with the state information of the radio wave detected by the radio wave state detection unit;
A reading unit that reads identification information of an RFID tag arranged at a position in the vicinity of a stop position of a user holding the device,
The storage unit stores identification information of the RFID tag and position information of a stop position corresponding to the RFID tag in association with each other,
The motion sensor outputs stop information indicating that the user holding the own device is stopped according to the detected acceleration information and azimuth information when the own device is stopped,
The control unit determines whether the user has stopped according to the stop information output from the motion sensor, the user has stopped, and the RFID tag identification information has been read by the reading unit Position information stored in the storage unit corresponding to the read identification information, and the position information stored in association with the radio wave state information in the storage unit by the read position information. To correct the mobile device. An informing unit for informing,
Wherein, when correcting the position information, the portable device according to claim 1 for notifying that corrects the position information to the notification unit. It has an operation unit that accepts site survey execution instruction input,
Wherein the control unit, the portable device according to claim 1 or 2 execution instruction site survey on the operation unit when it is entered, initiates the acquisition and storage of position information and the radio wave state information of the user. Computer
A radio wave state detection unit that receives radio waves from an access point installed in a site subject to site survey and detects state information of the received radio waves,
A motion sensor that detects acceleration information and direction information of the own device, and calculates position information of a user holding the own device from the acceleration information and direction information;
A control unit that stores the position information of the user calculated by the motion sensor in a storage unit in association with the state information of the radio wave detected by the radio wave state detection unit;
A reading unit that reads identification information of an RFID tag arranged at a position in the vicinity of a stop position of a user holding the device;
Is a program for functioning as
The storage unit stores identification information of the RFID tag and position information of a stop position corresponding to the RFID tag in association with each other,
The motion sensor functions to output stop information indicating that the user holding the own device is stopped according to the detected acceleration information and azimuth information when the own device is stopped,
The control unit determines whether the user has stopped according to the stop information output from the motion sensor, the user has stopped, and the RFID tag identification information has been read by the reading unit Position information stored in the storage unit corresponding to the read identification information, and the position information stored in association with the radio wave state information in the storage unit by the read position information. A program to make it function to correct .

Images