JP2006267057A - Position-detection system, portable terminal, position-detecting method and program thereof - Google Patents

Position-detection system, portable terminal, position-detecting method and program thereof Download PDF

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Publication number
JP2006267057A
JP2006267057A JP2005089491A JP2005089491A JP2006267057A JP 2006267057 A JP2006267057 A JP 2006267057A JP 2005089491 A JP2005089491 A JP 2005089491A JP 2005089491 A JP2005089491 A JP 2005089491A JP 2006267057 A JP2006267057 A JP 2006267057A
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wireless tag
position
map information
information
database
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JP2005089491A
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Takahiro Konno
貴洋 今野
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Ntt Comware Corp
エヌ・ティ・ティ・コムウェア株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a position-detection system, a portable terminal, a position-detecting method and a program thereof that can obtain precise position information, even when a pedestrian stays outdoors. <P>SOLUTION: A database 10 associates tag IDs of wireless tags 2, 5 with the positional information of positions with the wireless tags 2, 5 provided thereat for recording and therewith associates the position information with map information to record the same. The portable terminal 6 receives radio waves from a GPS satellite 7 for obtain the position information. The terminal 6 obtains the tag IDs of the wireless tags 2, 5 by referring to the database 10, and then obtains position information. The terminals 6 obtains, based on at least one of both positional information based on the detabace 10 that are determined from the radio waves received from the GPS satellite 7 and from the tag IDs received from the wireless tags 2, 5, map information, and then displays the same. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a position detection system, a portable terminal, a position detection method, and a program for specifying the position of a pedestrian or the like.

Conventionally, a technique described in Patent Document 1 is known as a technique for specifying the position of a pedestrian using GPS (Global Positioning System). In this technique, an azimuth sensor that acquires the direction in which the pedestrian travels and a step count counter that acquires the number of steps the pedestrian has walked are provided on the footwear worn by the pedestrian. This is the case where the pedestrian enters an underground city where GPS cannot be used, based on the direction information acquired by the direction sensor and the information obtained by multiplying the number of steps acquired by the step counter by the average step length of the pedestrian. But I am seeking the approximate location of the pedestrian.
JP 2003-217095 A

  However, in the technique described in Patent Document 1, although the position of the pedestrian can be specified when the pedestrian is outdoors and can receive the GPS radio wave, he / she walks indoors or in an underground city where the GPS radio wave cannot be received. There was a problem that the position of the person could not be specified accurately.

  The present invention has been made in consideration of the above circumstances, and its purpose is position detection that can acquire accurate position information regardless of whether a pedestrian is outdoors or indoors. A system, a portable terminal, a position detection method, and a program are provided.

  The present invention has been made to solve the above problems, and the invention according to claim 1 is characterized in that a tag ID for identifying each tag is recorded and a plurality of wireless tags installed at a plurality of locations. And a portable terminal comprising GPS signal receiving means, wireless tag reading means, map information acquisition means, display means, a wireless tag database, and a map information database, and an information management device connected to the portable terminal via a communication line The wireless tag database records the tag ID of the wireless tag in association with the position information of the position where the wireless tag is installed, and the map information database stores the position information and The GPS signal receiving means receives radio waves from GPS satellites to acquire position information of the portable terminal, and records the wireless information. The reading means acquires a tag ID from the wireless tag and acquires the position information of the wireless tag by referring to the wireless tag database, and the map information acquisition means includes the GPS signal receiving means and the wireless tag reading means. The position detection system is characterized in that the map information is acquired from the map information database based on the position information acquired by at least one, and the display means displays the map information acquired by the map information acquisition means.

  According to a second aspect of the present invention, the information about which of the GPS signal receiving means and the wireless tag reading means is used by the map information acquisition means to correspond to the position information. The map information acquisition means further determines whether to use one or both of the GPS signal receiving means and the wireless tag reading means based on the position information database. The position detection system according to claim 1.

  According to a third aspect of the present invention, the map information acquisition unit is configured to acquire the map information acquisition unit based on a radio wave intensity received from a GPS satellite, a captured number of GPS satellites, or a radio wave intensity received from a wireless tag. 2. The position detection system according to claim 1, which determines whether to use one or both of the GPS signal receiving unit and the wireless tag reading unit.

  The invention according to claim 4 further includes a position correction unit that corrects position information based on position information acquired by the GPS signal receiving unit and position information acquired by the wireless tag reading unit. The position detection system according to claim 1, wherein the position detection system is a feature of the position detection system.

  The invention according to claim 5 associates the tag information of the wireless tag with the position information of the position where the wireless tag is installed, and associates the position information with the map information. Information management device comprising a map information database to be recorded and tag IDs for identifying the respective tags are recorded, communicated with a plurality of wireless tags installed at a plurality of locations, and via a communication line A portable terminal connected to the information management device, wherein the radio signal is received from a GPS satellite to obtain position information of the portable terminal; a tag ID is obtained from the wireless tag; The RFID tag reading means for acquiring the position information of the RFID tag by referring to the tag database, the GPS signal receiving means, and the RFID tag reading means A mobile phone comprising: map information acquisition means for acquiring map information from the map information database based on position information acquired by either one; and display means for displaying the map information acquired by the map information acquisition means. It is a terminal.

  In the invention according to claim 6, tag IDs for identifying each tag are recorded, a plurality of wireless tags installed at a plurality of places, GPS signal receiving means, wireless tag reading means, map information A position detection method for detecting a position of the mobile terminal by an information management device including an acquisition means, a display means, a wireless tag database, a map information database, and connected to the mobile terminal via a communication line A first step of recording a tag ID of the wireless tag and position information of a position where the wireless tag is installed in association with the wireless tag database; and position information and map information by the map information database. And the second step of recording in association with each other, and receiving the radio wave from the GPS satellite by the GPS signal receiving means, A third step of acquiring information; a fourth step of acquiring position information of the wireless tag by acquiring a tag ID from the wireless tag by the wireless tag reading means and referring to the wireless tag database; A fifth step of acquiring map information from the map information database based on position information acquired by at least one of the GPS signal receiving means and the wireless tag reading means by the map information acquiring means; and the map by the display means. And a sixth step of displaying the map information acquired by the information acquisition means.

  According to a seventh aspect of the present invention, there is provided a wireless terminal in which a tag ID for identifying each tag is recorded, a portable terminal including a GPS signal receiving means, a wireless tag reading means, and a display means; A position detection program for detecting a position of the mobile terminal by controlling a tag database and an information management device including a map information database, wherein the tag ID of the wireless tag and the wireless tag are installed in the wireless tag database A first step for recording the position information of the current position in association with each other, a second step for recording the position information and map information in association with each other in the map information database, and a GPS satellite in the GPS signal receiving means. Receiving a radio wave from the mobile terminal to acquire position information of the portable terminal; and A fourth step of acquiring a tag ID from a tag and referring to the wireless tag database to acquire position information of the wireless tag; and a position acquired by at least one of the GPS signal receiving unit and the wireless tag reading unit A fifth step for requesting the map information database to transmit map information based on the information; and a sixth step for causing the display means to display map information transmitted in response to the request in the fifth step. Is a position information detection program for causing a computer to execute these steps.

In the present invention, the position information of one or both of the position information of the portable terminal obtained by receiving the radio wave transmitted from the GPS satellite and the position information of the portable terminal obtained by receiving the radio wave transmitted from the wireless tag. The map information was acquired based on the information.
Thereby, the method of acquiring position information can be switched depending on whether the mobile terminal can receive radio waves transmitted from GPS satellites or whether the mobile terminal can receive radio waves transmitted from the wireless tag. As a result, more accurate location information and map information of the mobile terminal can be acquired.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a position detection system according to the present embodiment. This position detection system includes a wireless access point 1 installed outdoors, a plurality of wireless tags 2, 2,... Installed outdoors, an information center 3, a wireless access point 4 installed indoors, and installed indoors. Have a plurality of wireless tags 5, 5,. Here, outdoor refers to a place where radio waves transmitted from GPS such as in a park or on a road can be received. In addition, indoor means a place where a radio wave transmitted from GPS such as an underground mall or a building cannot be received.
FIG. 1 shows a case where one wireless access point 1 and three wireless tags 2 are installed outdoors, one wireless access point 4 and five wireless tags 5 are installed indoors. However, it is not limited to such a configuration, and any number may be installed.

The mobile terminal 6 is a terminal possessed when a pedestrian goes out and the like, and receives position information about the latitude and longitude of the mobile terminal 6 by receiving radio waves transmitted by the GPS satellite 7.
When the mobile terminal 6 is located in a range where it can communicate with the wireless tags 2 and 5, the mobile terminal 6 acquires a tag ID for identifying each tag from the wireless tags 2 and 5. Further, when the mobile terminal 6 is located in a range where communication with the wireless access points 1 and 4 is possible, the mobile terminal 6 communicates with the wireless access points 1 and 4, respectively.
The wireless access points 1 and 4 and the information center 3 are connected to the network 8 and can communicate with each other. The network 8 is configured by a network such as the Internet.

The information center 3 has an information management server 9 and a database 10. The information management server 9 acquires position information transmitted from the mobile terminal 6, performs processing such as reading out map information corresponding to the position information from the database 10 and transmitting it to the mobile terminal 6.
The database 10 is a map information database that records map information, a wireless tag database that records the tag IDs of the wireless tags 2 and 5 and the position information of the positions where the wireless tags 2 and 5 are installed in association with each other, GPS It has a position information database for recording information about which of the satellite 7 and the wireless tags 2 and 5 is used to specify the position information of the portable terminal 1.
As the mobile terminal 6, a mobile phone, a terminal such as a PHS (Personal Handyphone System), a PDA (Personal Digital Assistant) can be used. The portable terminal 6 moves indoors or outdoors as the pedestrian carrying the terminal moves.

FIG. 2 is a block diagram showing the configuration of the mobile terminal 6 according to the present embodiment. The portable terminal 6 includes a GPS signal receiving unit 11, a wireless tag reading unit 12, a storage unit 13, a network connection unit 14, a mode switching unit 15, a position correction unit 16, and a display unit 17.
The GPS signal receiving unit 11 acquires position information about the latitude and longitude where the mobile terminal 6 is located by receiving radio waves transmitted from a plurality of GPS satellites 7. The wireless tag reading unit 12 receives radio waves transmitted from the wireless tags 2 and 5 and acquires tag ID information for identifying the wireless tag.
The location information acquired by the GPS signal receiving unit 11, the tag ID information acquired by the wireless tag reading unit 12, and the like are recorded in the storage unit 13. The storage unit 13 is configured by a RAM (Random Access Memory) or the like.

The network connection unit 14 reads position information and tag ID information recorded in the storage unit 13 and transmits them to the information management server 9 of the information center 3 via the wireless access points 1 and 4 and the network 8. Further, the network connection unit 14 acquires map information and the like via the network 8 and the wireless access points 1 and 4.
The mode switching unit 15 switches between “GPS mode”, “wireless tag mode”, and “GPS / wireless tag shared mode”. The “GPS mode” is a mode in which position information of the mobile terminal 6 is acquired by receiving radio waves from the GPS satellite 7. The “wireless tag mode” is a mode in which the tag ID is acquired from the wireless tags 2 and 5 and the position information of the mobile terminal 6 is acquired based on the tag ID. “GPS / wireless tag sharing mode” refers to position information acquired by receiving radio waves from the GPS satellite 7, and position information acquired based on the tag ID obtained from the wireless tags 2 and 5. In this mode, the position information of the portable terminal 6 is acquired based on both the position information. Specific processing in each mode will be described later with reference to FIGS.

When the mobile terminal 6 is set to the GPS / wireless tag sharing mode, the position correction unit 16 receives the position information acquired by receiving radio waves from the GPS satellite 7 and the tag ID from the wireless tags 2 and 5. The position information of the portable terminal 6 is calculated from the position information acquired and acquired based on the tag ID. A method for calculating the position information of the mobile terminal 6 by the position correction unit 16 will be described later with reference to FIGS.
The display unit 17 is configured by an LCD (Liquid Crystal Display) or the like, and displays map information and the like recorded in the storage unit 13 on a display screen.

Next, an operation when the mobile terminal 6 is set to the “GPS mode” will be described. FIG. 3 is a sequence diagram illustrating a processing flow when the position detection system according to the present embodiment is in the “GPS mode”.
First, when the GPS signal receiver 11 of the mobile terminal 6 receives radio waves transmitted from a plurality of GPS satellites 7 (step S101), it acquires position information about the latitude and longitude of the mobile terminal 6 (step S102). And recorded in the storage unit 13. In order to specify the position of the mobile terminal 6 based on the radio wave transmitted from the GPS satellite 7, it is necessary that radio waves can be received from four or more GPS satellites.
The network connection unit 14 of the portable terminal 6 reads out the position information recorded in the storage unit 13, and communicates with the information management server 9 of the information center 3 through the network 8 via the wireless access point 1 (step S 103). (Step S104).

The information management server 9 searches the database 10 for location information acquired from the mobile terminal 6 (step S105), and reads map information corresponding to the location information (step S106). The map information is, for example, a map around a point determined by latitude and longitude included in the position information.
The information management server 9 transmits the map information read from the database 10 to the mobile terminal 6 via the network 8 via the wireless access point 1 (step S107) (step S108). The network connection unit 14 of the portable terminal 6 acquires the map information transmitted from the information management server 9 and records it in the storage unit 13. The display unit 17 displays the map information recorded in the storage unit 13 (step S109).

Next, an operation when the mobile terminal 6 is set to the “wireless tag mode” will be described.
FIG. 4 is a sequence diagram illustrating a processing flow when the position detection system according to the present embodiment is in the “wireless tag mode”. First, when the wireless tag reading unit 12 of the mobile terminal 6 enters an area where communication with the wireless tags 2 and 5 is possible, the information of the tag ID of the wireless tags 2 and 5 is acquired (step S201), and the storage unit 13 is stored. To record.
The network connection unit 14 of the portable terminal 6 reads the tag ID recorded in the storage unit 13, and communicates with the information management server 9 of the information center 3 via the network 8 via the wireless access point 4 (step S 202). (Step S203).
The information management server 9 searches the database 10 for the tag ID acquired from the mobile terminal 6 (step S204). In the database 10, as shown in FIG. 5, the tag ID of the wireless tag and the positional information about the latitude and longitude where the wireless tag is installed are recorded in association with each other.

The information management server 9 reads from the database 10 wireless tag installation location information about latitude and longitude corresponding to the tag ID received from the mobile terminal 6 (step S205). The information management server 9 searches the database 10 for the RFID tag location information read from the database 10 (step S206), and reads the map information corresponding to the RFID tag location information (step S207).
The information management server 9 transmits the map information read from the database 10 to the portable terminal 6 via the network 8 via the wireless access point 4 (step S208) (step S209). The network connection unit 14 of the portable terminal 6 acquires the map information transmitted from the information management server 9 and records it in the storage unit 13. The display unit 17 displays the map information recorded in the storage unit 13 (step S210).

Next, the operation when the mobile terminal 6 is set to the “GPS / wireless tag sharing mode” will be described. FIG. 6 is a sequence diagram showing a processing flow when the position detection system according to the present embodiment is in the “GPS / wireless tag sharing mode”. First, when the GPS signal receiving unit 11 of the mobile terminal 6 receives radio waves transmitted from a plurality of GPS satellites 7 (step S301), it acquires position information about the latitude and longitude of the mobile terminal 6 (step S302). And recorded in the storage unit 13.
Further, the wireless tag reading unit 12 of the mobile terminal 6 acquires information on the tag ID of the wireless tag 2 (step S303) and records it in the storage unit 13. The network connection unit 14 of the portable terminal 6 reads the tag ID recorded in the storage unit 13, and communicates with the information management server 9 of the information center 3 via the network 8 via the wireless access point 1 (step S 304). (Step S305).

The information management server 9 transmits the tag ID acquired from the mobile terminal 6 to the database 10 (step S306). The information management server 9 reads from the database 10 wireless tag installation location information regarding latitude and longitude corresponding to the tag ID received from the mobile terminal 6 (step S307). The RFID tag location information read from the database 10 is transmitted to the portable terminal 6 by the information management server 9 (step S308) and recorded in the storage unit 13 of the portable terminal 6.
The position correction unit 16 of the portable terminal 6 is based on the position information acquired by the GPS signal receiving unit 11 recorded in the storage unit 13 and the wireless tag installation location information recorded in the storage unit 13. 6 is corrected (step S309), and the corrected position information is recorded in the storage unit 13. A specific method for calculating the correction position information will be described later with reference to FIG.

The network connection unit 14 reads the corrected position information from the storage unit 13 and transmits it to the information management server 9 of the information center 3 (step S310). The information management server 9 searches the database 10 for corrected position information acquired from the portable terminal 6 (step S311), and reads map information corresponding to the corrected position information (step S312).
The information management server 9 transmits the map information read from the database 10 to the portable terminal 6 via the network 8 via the wireless access point 1 (step S313) (step S314). The network connection unit 14 of the portable terminal 6 acquires the map information transmitted from the information management server 9 and records it in the storage unit 13. The display unit 17 displays the map information recorded in the storage unit 13 (step S315).

  3, 4, and 6 described above, the location information is transmitted from the mobile terminal 3 to the information management server 9 while the communication between the mobile terminal 6 and the information center 3 is maintained, and the information management server Although the case where the map information is transmitted from 9 to the mobile terminal 6 has been described, the present invention is not limited to such a configuration. For example, the portable terminal ID of the portable terminal 6 may be transmitted from the portable terminal 6 to the information management server 9 together with the position information. With this configuration, even when communication between the mobile terminal 6 and the information management server 9 is interrupted, the information management server 9 can map information to the mobile terminal 6 based on the mobile terminal ID. Can be sent.

Next, a method for calculating corrected position information in the position correction unit 16 of the mobile terminal 6 according to the present embodiment will be described. FIGS. 7A and 7B are diagrams illustrating a method of calculating corrected position information by the position detection system according to the present embodiment.
Position information A (latitude, longitude) = (x1, y1) of the portable terminal 6 specified by the GPS signal receiving unit 11 and position information B (latitude, longitude) of the portable terminal 6 specified by the wireless tag reading unit 12 = (X2, y2) is calculated with a certain error. Here, a case where the longitude error and the latitude error calculated by the GPS signal receiving unit 11 are d and the radial error calculated by the wireless tag reading unit 12 is r will be described.
The position correction unit 16 can calculate the correction position information of the mobile terminal 6 by the method shown in FIG. That is, the range E3 (the range indicated by the oblique lines in FIG. 7A) where the error range E1 of the mobile terminal 6 calculated by the GPS signal receiving unit 11 and the error range E2 of the mobile terminal 6 calculated by the wireless tag reading unit 12 overlap. ) And the position determined by the center of gravity is used as the longitude and latitude of the portable terminal 6 to calculate the corrected position information.

In addition, when there is no range E3 where the range E1 and the range E2 overlap in FIG. 7A, a point C that internally divides the points A and B into d: r is obtained as shown in FIG. 7B. The corrected position information may be calculated as the longitude and latitude of the mobile terminal 6.
In the description of FIG. 7 described above, the method described in FIG. 7A is used when there is a range E3 that overlaps the ranges E1 and E2, and when there is no overlap range E3, FIG. Although the case where the method described in b) is used has been described, the method is not limited to such a method, and the method described in FIG. 7B is used even when the overlapping range E3 exists. Then, the corrected position information of the mobile terminal 6 may be calculated.

Next, an evaluation method of the position information error d (see FIG. 7A) calculated by the GPS signal receiving unit 11 will be described with reference to FIG. 8A.
The longitude and latitude errors d of the mobile terminal 6 calculated by the GPS signal receiving unit 11 are calculated based on the equation d = d0 × d1 every time the GPS signal receiving unit 11 calculates the position information of the mobile terminal 6. . Here, d0 is the maximum error of longitude and latitude when positioning by the GPS signal receiver 11 is performed. D1 is an error coefficient.
As shown in FIG. 8 (a), the error d indicates that the stronger the radio waves from the GPS satellites received by the GPS signal receiver 11, the greater the number of GPS satellites that the GPS signal receiver 11 receives. It gets smaller. Further, the error coefficient d1 takes a value of 0 to 1, and the closer to 0, the smaller the error, and the closer to 1, the larger the error.
The error coefficient d1 is an average value of the received radio wave intensity of the radio wave received from the GPS satellite used when the GPS signal receiving unit 11 performs positioning, and the GPS satellite from which the GPS signal receiving unit 11 was able to receive the radio wave. Calculated from the number of captures. The threshold value, maximum error d0, and error coefficient d1 for separating the received radio wave intensity and the number of GPS satellites captured are determined in advance by experiments.

Next, a method for evaluating the error r of the position information of the portable terminal 6 calculated by the wireless tag reading unit 12 will be described with reference to FIG.
The radius error r of the presence of the mobile terminal 6 calculated by the wireless tag reader 12 is calculated based on the equation r = r0 × r1 every time the wireless tag reader 12 calculates the position information of the mobile terminal 6. . Here, r0 is the maximum error between the portable terminal 6 and the wireless tag 2 when positioning by the wireless tag reading unit 12 is performed. R1 is an error coefficient.
As shown in FIG. 8B, the error r decreases as the intensity of the radio wave received from the wireless tag 2 received by the wireless tag reader 12 increases. The error coefficient r1 takes a value from 0 to 1, and the closer to 0, the smaller the error, and the closer to 1, the larger the error.
The error coefficient r1 is calculated from the received radio wave intensity of the radio wave received from the wireless tag 2 used when the wireless tag reading unit 12 performs positioning. The threshold, maximum error r0, and error coefficient r1 for dividing the received radio wave intensity stage are determined in advance by experiments.

Next, how to switch between the “GPS mode (see FIG. 3)”, “wireless tag mode (see FIG. 4)”, and “GPS / wireless tag shared mode (see FIG. 6)” described above will be described.
In the database 10 of the information center 3, area information as shown in FIG. 9 is recorded in association with map information. That is, according to the latitude and longitude, any mode of the area Z1 in which the “GPS mode” can be used, the area Z2 in which the “wireless tag mode” can be used, and the area Z3 in which the “GPS / wireless tag shared mode” can be used Also, information on the area Z4 that cannot be used is recorded in advance.
When the information management server 9 acquires the position information of the mobile terminal 6, based on the area information shown in FIG. 9, the information management server 9 obtains information about which of the areas Z <b> 1 to Z <b> 4 the mobile terminal 6 is located in. Send to. The mode switching unit 15 of the mobile terminal 6 determines which mode is to be used in the mobile terminal 6 based on the information.

When the mobile terminal 6 is set to the “GPS mode”, the mode switching unit 15 drives only the GPS signal receiving unit 11 used for the “GPS mode” and reads the wireless tag used for the “wireless tag mode”. The power supply to the unit 12 is stopped.
When the mobile terminal 6 is set to the “wireless tag mode”, the mode switching unit 15 drives only the wireless tag reading unit 12 used for the “wireless tag mode” and uses it for the “GPS mode”. The GPS signal receiving unit 11 stops supplying power.
By performing such control, the holder of the portable terminal 6 does not need to perform a special operation, so that the time required for position detection can be shortened, and the GPS signal receiving unit 11 and the wireless tag reading unit 12 Of these, power supply for those not used can be stopped, and the power consumed by the mobile terminal 6 can be reduced.

  In FIG. 9, when the mobile terminal 6 enters the area Z4, the mode switching unit 15 switches the mobile terminal 6 to the “GPS / wireless tag sharing mode”. Thereby, when the portable terminal 6 moves from the area Z4 to the other areas Z1 to Z3, it becomes possible to immediately transmit the position of the own terminal to the information management server 9, and the map information of the portable terminal 6 is obtained. It can be acquired immediately.

  In addition, although FIG. 9 demonstrated the case where an area was divided into four area | regions Z1-Z4 according to the latitude and longitude, you may set warning area Z5 as shown in FIG. The warning area Z5 is an area indicating that there is an area Z4 in which none of the “GPS mode”, “wireless tag mode”, and “GPS / wireless tag shared mode” can be used nearby. When the mobile terminal 6 moves to the warning area Z5, the map information as shown in FIG. 10 is displayed on the display unit 17 of the mobile terminal 6, so that the direction in which the owner of the mobile terminal 6 moves is the area Z4. You can get information about entering.

In the above description, the mode switching unit 15 of the mobile terminal 6 switches the mode based on the map information shown in FIG. 9 recorded in the database 10 of the information center 3. It is not limited to such a configuration.
For example, when the GPS signal receiving unit 11 of the mobile terminal 6 can no longer receive radio waves from the GPS satellite 7, the mode switching unit 15 may switch to the “wireless tag mode”. At this time, power is supplied to the wireless tag reading unit 12 used in the “wireless tag mode”, and power supply to the GPS signal receiving unit 11 not used in the “wireless tag mode” is stopped.

In addition, when the wireless tag reading unit 12 of the portable terminal 6 cannot receive radio waves from the wireless tag, the mode switching unit 15 may switch to the “GPS mode”. At this time, power is supplied to the GPS signal receiving unit 11 used in the “GPS mode”, and power supply to the wireless tag reading unit 12 not used in the “GPS mode” is stopped.
According to the above-described method, the mobile terminal 6 does not need to acquire map information about which area of the area Z1 to Z4 the mobile terminal 6 is in, and which mode is set only by the processing in the mobile terminal 6 Therefore, the time required for detecting the position of the mobile terminal 6 can be shortened. Since the GPS signal receiving unit 11 and the wireless tag reading unit 12 that are not used are not supplied with power, the power consumed by the mobile terminal 6 can be reduced.

  When switching between the “GPS mode” and the “wireless tag mode” by the mode switching unit 15, it is possible to receive radio waves continuously for a predetermined time instead of switching modes immediately when radio waves cannot be received. It is desirable to switch the mode only when there is no radio wave or when the frequency at which radio waves cannot be received increases. In this way, it is possible to prevent a situation in which the mode is switched immediately until it is impossible to receive radio waves from the GPS satellite 7 or the wireless tags 2 and 5 accidentally. Waste can be reduced.

Further, as shown in FIG. 11, there are areas Z1 to Z3 in which any one of “GPS mode”, “wireless tag mode”, and “GPS / wireless tag shared mode” can be used, and area Z4 in which neither mode can be used. When the wireless tag 20 is installed in the boundary area and the tag ID of the wireless tag 20 installed in the boundary area is transmitted from the portable terminal 6, the information recorded in the database of the information center 3 is referred to. Thus, it may be determined that the mobile terminal 6 is approaching the boundary area.
Then, the map information as shown in FIG. 11 is transmitted from the information management server 9 to the mobile terminal 6 and displayed on the display unit 17, so that “GPS” You may make it notify about entering into the area Z4 which cannot use any mode of "mode", "wireless tag mode", and "GPS / wireless tag shared mode".

In the above-described embodiment, a barcode may be installed instead of the wireless tags 2 and 5, and the portable terminal 6 may be provided with a barcode reader function to specify the position of the portable terminal 6.
In addition, a tag used for short-range wireless communication (Bluetooth (registered trademark), ZigBee (registered trademark), etc.) is used instead of the wireless tags 2 and 5, and a function for reading an address recorded on the tag is provided on the mobile terminal 6. Thus, the position of the mobile terminal 6 may be specified. Further, the position of the mobile terminal 6 may be specified in the same manner by using UWB (Ultra Wide Band).

Further, an infrared transmitter may be installed instead of the wireless tags 2 and 5, and the position of the portable terminal 6 may be specified by reading the infrared information transmitted from the infrared transmitter to the portable terminal 6.
Further, without using the wireless tags 2 and 5, the portable terminal 6 provides a connection function for the wireless LAN, and the position of the portable terminal 6 is specified by performing communication between the portable terminal 6 and the wireless LAN access point. You may do it. In this case, if the mobile terminal 6 can communicate with three or more wireless LAN access points, the position of the mobile terminal 6 can be obtained by three-point surveying.
In the above-described embodiment, the case where the mobile terminal 6 receives radio waves from one radio tag has been described. However, the present invention is not limited to such a configuration, and the mobile terminal 6 receives radio waves from a plurality of radio tags. Then, the position of the mobile terminal 6 may be specified.

If the position detection system according to the above-described embodiment is used, the “GPS mode”, the “wireless tag mode”, and the “GPS / wireless tag sharing mode” are switched even when the portable terminal 6 goes back and forth between indoors and outdoors. Thereby, the position information of the portable terminal 6 can be continuously acquired.
In addition, by defining a mode to be used according to the position information of the mobile terminal 6 in the database 10 of the information center 3, it is possible to speed up the process of detecting the position of the mobile terminal 6. Battery consumption can be reduced.
In addition, the values of the error d and the error r are changed depending on the received radio wave intensity of the radio wave transmitted from the GPS satellite 7 and the wireless tags 2 and 5 and the number of GPS satellites 7 that can be received by the mobile terminal 6. Therefore, the position of the portable terminal 6 can be specified more accurately.

  In the embodiment described above, a program for realizing functions such as the information management server 9 in FIG. 1, the mode switching unit 15 in FIG. 2, and the position correction unit 16 is recorded on a computer-readable recording medium, The position detection system may be controlled by causing the computer system to read and execute the program recorded on the recording medium. Here, the “computer system” includes an OS and hardware such as peripheral devices.

  The “computer-readable recording medium” refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, and a CD-ROM, and a storage device such as a hard disk built in the computer system. Further, the “computer-readable recording medium” dynamically holds a program for a short time, like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, it is also assumed that a server that holds a program for a certain time, such as a volatile memory inside a computer system that serves as a server or client. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.

1 is a schematic configuration diagram of a position detection system according to an embodiment of the present invention. It is a block diagram which shows the structure of the portable terminal 6 by this embodiment. It is a sequence diagram which shows the flow of a process when the position detection system by this embodiment is "GPS mode." FIG. 10 is a sequence diagram illustrating a processing flow when the position detection system according to the present embodiment is in a “wireless tag mode”. It is an example of the data recorded on a database. It is a sequence diagram which shows the flow of a process in case the position detection system by this embodiment is "GPS / radio tag common mode". It is a figure which shows the calculation method of the correction position information by the position detection system by this embodiment. 7 is a table showing an evaluation method of error d and error r of position information of portable terminal 6. 3 is a diagram illustrating an example of area information recorded in a database 10. FIG. 3 is a diagram illustrating an example of area information recorded in a database 10. FIG. 3 is a diagram illustrating an example of area information recorded in a database 10. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Wireless access point installed outdoors, 2 ... Multiple wireless tags installed outdoors, 3 ... Information center, 4 ... Wireless access points installed indoors, 5 A plurality of wireless tags installed indoors, 6 ... mobile terminals, 7 ... GPS satellites, 8 ... network, 9 ... information management server, 10 ... database, 11 ... GPS Signal receiving unit, 12 ... wireless tag reading unit, 13 ... storage unit, 14 ... network connection unit, 15 ... mode switching unit, 16 ... position correction unit, 17 ... display unit 20 RFID tags arranged in the boundary area

Claims (7)

  1. Tag IDs for identifying each tag are recorded, a plurality of wireless tags installed at a plurality of locations, a portable terminal including GPS signal receiving means, wireless tag reading means, map information acquisition means, display means, A position detection system comprising a wireless tag database, a map information database, and an information management device connected to the portable terminal via a communication line,
    The wireless tag database records the tag ID of the wireless tag in association with the position information of the position where the wireless tag is installed,
    The map information database records position information and map information in association with each other,
    The GPS signal receiving means receives radio waves from GPS satellites to acquire position information of the mobile terminal,
    The wireless tag reading means acquires the tag information from the wireless tag and acquires the position information of the wireless tag by referring to the wireless tag database,
    The map information acquisition means acquires map information from the map information database based on position information acquired by at least one of the GPS signal reception means and the wireless tag reading means,
    The position detection system, wherein the display means displays the map information acquired by the map information acquisition means.
  2. A position information database that records information about which of the GPS signal receiving means and the wireless tag reading means is used by the map information acquisition means in association with the position information; ,
    The position detection system according to claim 1, wherein the map information acquisition means determines whether to use one or both of the GPS signal reception means and the wireless tag reading means based on the position information database. .
  3.   The map information acquisition means is configured to enable the map information acquisition means to read the GPS signal reception means or the wireless tag based on the radio wave intensity received from a GPS satellite or the number of captured GPS satellites or the radio wave intensity received from a radio tag. The position detection system according to claim 1, wherein it is determined whether to use one or both of the means.
  4.   4. The apparatus according to claim 1, further comprising a position correction unit that corrects position information based on position information acquired by the GPS signal receiving unit and position information acquired by the wireless tag reading unit. The position detection system according to the section.
  5. Information management comprising a wireless tag database that records the tag ID of the wireless tag and the position information of the position where the wireless tag is installed in association with each other, and a map information database that records the position information and map information in association with each other Tag IDs for identifying the device and each tag are recorded, communicate with a plurality of wireless tags installed at a plurality of locations, and connected to the information management device via a communication line. There,
    GPS signal receiving means for receiving radio waves from a GPS satellite and acquiring position information of the mobile terminal;
    Wireless tag reading means for acquiring a tag ID from the wireless tag and referring to the wireless tag database to acquire position information of the wireless tag;
    Map information acquisition means for acquiring map information from the map information database based on position information acquired by at least one of the GPS signal reception means and the wireless tag reading means;
    Display means for displaying the map information acquired by the map information acquisition means;
    A portable terminal characterized by comprising:
  6. Tag IDs for identifying each tag are recorded, a plurality of wireless tags installed at a plurality of locations, a portable terminal including GPS signal receiving means, wireless tag reading means, map information acquisition means, display means, A position detection method comprising a wireless tag database, a map information database, and detecting a position of the portable terminal by an information management device connected to the portable terminal via a communication line,
    A first step of associating and recording a tag ID of the wireless tag and position information of a position where the wireless tag is installed by the wireless tag database;
    A second step of recording location information and map information in association with each other by the map information database;
    A third step of receiving radio waves from a GPS satellite by the GPS signal receiving means to obtain position information of the mobile terminal;
    A fourth step of acquiring position information of the wireless tag by acquiring a tag ID from the wireless tag by the wireless tag reading means and referring to the wireless tag database;
    A fifth step of acquiring map information from the map information database based on position information acquired by at least one of the GPS signal receiving means and the wireless tag reading means by the map information acquiring means;
    A sixth step of displaying the map information acquired by the map information acquisition means by the display means;
    A position detection method comprising:
  7. Information management apparatus comprising a plurality of wireless tags in which tag IDs for identifying each tag are recorded, a portable terminal comprising GPS signal receiving means, wireless tag reading means, display means, a wireless tag database, and a map information database A position detection program for detecting the position of the mobile terminal by controlling
    A first step of recording a tag ID of the wireless tag and position information of a position where the wireless tag is installed in the wireless tag database in association with each other;
    A second step of causing the map information database to record position information and map information in association with each other;
    A third step of causing the GPS signal receiving means to receive radio waves from a GPS satellite to acquire position information of the mobile terminal;
    A fourth step of causing the wireless tag reading means to acquire a tag ID from the wireless tag and to acquire position information of the wireless tag by referring to the wireless tag database;
    A fifth step of requesting the map information database to transmit map information based on position information acquired by at least one of the GPS signal receiving means and the wireless tag reading means;
    A sixth step of causing the display means to display map information transmitted in response to the request in the fifth step;
    Position information detection program for causing a computer to execute.
JP2005089491A 2005-03-25 2005-03-25 Position-detection system, portable terminal, position-detecting method and program thereof Pending JP2006267057A (en)

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JP2008278300A (en) * 2007-05-01 2008-11-13 Hitachi Kokusai Electric Inc Radio equipment position detecting method
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JP2008112256A (en) * 2006-10-30 2008-05-15 Secom Co Ltd Position management system
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JP2008216196A (en) * 2007-03-07 2008-09-18 Mitsubishi Electric Corp Positioning system, autonomous positioning device, and marker administration device
JP2008278300A (en) * 2007-05-01 2008-11-13 Hitachi Kokusai Electric Inc Radio equipment position detecting method
JP2009073064A (en) * 2007-09-21 2009-04-09 Ricoh Co Ltd Information processing device
JP2011502290A (en) * 2007-12-10 2011-01-20 ヒデ ソリューションズ カンパニー リミテッド Object position information tag device and object position information management system
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KR101020504B1 (en) * 2008-06-25 2011-03-09 팅크웨어(주) Location confirmartion method and apparatus using rfid
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US9313615B2 (en) 2009-10-01 2016-04-12 Qualcomm Incorporated Mobile device locating in conjunction with localized environments
US8812015B2 (en) 2009-10-01 2014-08-19 Qualcomm Incorporated Mobile device locating in conjunction with localized environments
US9140559B2 (en) 2009-10-01 2015-09-22 Qualcomm Incorporated Routing graphs for buildings using schematics
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US9116003B2 (en) 2009-10-01 2015-08-25 Qualcomm Incorporated Routing graphs for buildings
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JP2014197036A (en) * 2009-10-01 2014-10-16 クアルコム,インコーポレイテッド Mobile device locating in conjunction with localized environments
US8897814B2 (en) 2009-10-12 2014-11-25 Qualcomm Incorporated Method and apparatus for transmitting indoor context information
US8880103B2 (en) 2009-10-12 2014-11-04 Qualcomm Incorporated Method and apparatus for transmitting indoor context information
US9143899B2 (en) 2009-10-12 2015-09-22 Qualcomm Incorporated Method and apparatus for transmitting indoor context information
US9894490B2 (en) 2009-10-12 2018-02-13 Qualcomm Incorporated Method and apparatus for transmitting indoor context information
US9389085B2 (en) 2010-01-22 2016-07-12 Qualcomm Incorporated Map handling for location based services in conjunction with localized environments
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JP2014149832A (en) * 2013-01-31 2014-08-21 Samsung Electronics Co Ltd Object display method, object provision method, and system for the same
US10165061B2 (en) 2013-01-31 2018-12-25 Samsung Electronics Co., Ltd. Method and system for displaying object, and method and system for providing the object
US10111046B2 (en) 2013-05-14 2018-10-23 Fujitsu Limited Portable type information processing apparatus, information processing system, and information processing method
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