JP2008209346A - System and method for correcting location information - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a location information correcting system capable of correcting location information obtained by location measurement using a GPS, while preventing the computing load of a mobile terminal from increasing and avoiding the size increase thereof. <P>SOLUTION: Location information of a vehicle having mounted thereon a mobile terminal device 1 and a car navigation system 3 is transmitted to a server device 4. In the server device 4, a neighborhood vehicle information extracting section 44 extracts a vehicle which is the nearest the mobile terminal device 1 and then transmits the information of the neighborhood vehicle to the mobile terminal device 1. The mobile terminal device 1 transmits a signal for requesting the neighborhood vehicle, to compute the error of the location information via a communication control section 12, on the basis of identification information. When the car navigation system 3 receives the signal requesting the computing of the error from the mobile terminal device 1, it computes the error in the location information of the GPS, and then transmits the information of the computed error to the mobile terminal device 1 that utilizes the service via a communication control section 32. The mobile terminal device 1 corrects the location information, according to the location measurement of the GPS 15 on own device, based on the error information. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a position information correction system and a position information correction method for correcting position information obtained by GPS positioning in a mobile terminal device.

In recent years, a GPS (Global Positioning System) has been mounted on a mobile terminal device in order to determine the position of the device itself. In Patent Document 1, a GPS satellite signal received by a mobile terminal device is transmitted to a position information providing server, and the position information providing server calculates the position of the mobile terminal device based on the GPS satellite signal sent from the mobile terminal device. Then, mapping position information obtained by mapping the position is distributed to the mobile terminal device.
JP 2006-64460 A

  In the portable terminal device, only GPS is mounted as means for acquiring position information. GPS positioning includes an error of about 10m, and if you want to obtain accurate position information without such an error, a gyro sensor or the like is installed in the mobile terminal device like a car navigation system. Or complicated processing such as DGPS (Differential GPS). However, if a gyro sensor is mounted in addition to GPS, the entire apparatus becomes large, and if complicated processing such as DGPS is performed, there is a problem that the load on the arithmetic unit increases.

  The present invention has been made in view of such problems, and a position information correction system and position information correction capable of correcting position information measured by GPS while avoiding an increase in calculation load and an increase in size of the mobile terminal device. It aims to provide a method.

  The position information correction system according to the present invention includes a management unit that manages a position of a mobile terminal device and a position of a vehicle on which a car navigation system is mounted, and a nearby vehicle extraction that extracts a vehicle in the vicinity of the mobile terminal device from the position information. A vehicle equipped with a car navigation system having a server device comprising means, a first GPS and a calculation means for calculating an error in position information measured by the first GPS, the second GPS, and the error based on the error And a portable terminal device having correction means for correcting position information measured by the second GPS.

  According to this configuration, the position information of the portable terminal device is obtained by using the error information to obtain an error from the position information obtained only by the GPS using the highly accurate position information obtained by the vehicle in the vicinity of the portable terminal device. Therefore, it is possible to correct the position information measured by the GPS while avoiding an increase in calculation load and an increase in size of the mobile terminal device.

  In the positional information correction system of the present invention, it is preferable that the car navigation system includes a gyro sensor, a vehicle speed sensor, and map matching means.

  In the position information correction system of the present invention, it is preferable that the management unit manages the position of the mobile terminal device and the position of the vehicle on which the car navigation system is mounted for each specific area.

  According to the position information correction method of the present invention, in the server device, the step of extracting a vehicle in the vicinity of the mobile terminal device based on the position of the mobile terminal device and the position of the vehicle on which the car navigation system is mounted; Requesting calculation of position information error with respect to the extracted nearby vehicle, and calculating error of position information measured by the GPS of its own device in the car navigation system of the nearby vehicle, The portable terminal device includes a step of correcting position information measured by the GPS of the device based on the error.

  According to this method, the position information of the portable terminal device is obtained by using the error information to obtain an error from the position information obtained only by the GPS using the highly accurate position information obtained by the vehicle in the vicinity of the portable terminal device. Therefore, it is possible to correct the position information measured by the GPS while avoiding an increase in calculation load and an increase in size of the mobile terminal device.

  In the position information correction method of the present invention, it is preferable that the car navigation system calculates an error of position information measured by the GPS of its own device using a gyro sensor, a vehicle speed sensor, and map matching means.

  In the position information correction method of the present invention, it is preferable that the server device extracts a vehicle in the vicinity of the mobile terminal device from the position of the mobile terminal device in a specific area and the position of the vehicle on which the car navigation system is mounted.

  The position information correction system according to the present invention extracts a vehicle in the vicinity of the portable terminal device based on the position of the portable terminal device and the position of the vehicle on which the car navigation system is mounted in the server device. The mobile terminal device is requested to calculate an error in position information with respect to the extracted nearby vehicle, and in the car navigation system of the nearby vehicle, the error in position information measured by the GPS of its own device is calculated. Based on the error, the position information measured by the GPS of the own device is corrected. Therefore, the position information measured by the GPS can be corrected while avoiding an increase in calculation load and an increase in size of the mobile terminal device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a diagram showing a schematic configuration for explaining a position information correction system according to an embodiment of the present invention. The system shown in FIG. 1 is connected to a mobile terminal 1, a vehicle equipped with a car navigation system 3 connected to the mobile terminal 1 via a mobile communication network 2, and a mobile terminal 1 to the mobile communication network 2. The server apparatus 4 is mainly configured.

  The mobile terminal 1 is equipped with a GPS, and can determine the position of the own device using the GPS. In addition, the mobile terminal 1 can transmit and receive information to and from the car navigation system 3 and the server device 4 via the mobile communication network 2. Further, the mobile terminal 1 can communicate with other mobile terminals via the mobile communication network 2 and can communicate with other computers via the mobile communication network 2 and the Internet. The mobile terminal 1 has an operating system (mobile device OS), and a browser function, a viewer function, a JAM (Java (registered trademark) Application Manager) and other functions operate on the mobile device OS.

  The mobile communication network 2 is a network between the mobile terminal 1, the car navigation system 3, and the server device 4. The mobile communication network 2 includes a mobile packet communication network in addition to a normal mobile communication network.

  The car navigation system 3 transmits the position information of the host vehicle to the server device 4 and obtains the position information measured by GPS and other detection information in the position information in response to a request from the portable terminal 1. An error with respect to the obtained position information is obtained, and this error information is transmitted to the portable terminal 1.

  The server device 4 manages the position information of the mobile terminal 1 that provides the service and the position information of the vehicle including the car navigation system 3 that provides the service, and is present in the vicinity of the mobile terminal 1 in a specific area. The vehicle information to be extracted is extracted, and the nearby vehicle information is transmitted to the mobile terminal 1.

  In such a system, the server device 4 extracts a nearby vehicle of the portable terminal 1 based on the position of the portable terminal 1 and the position of the vehicle on which the car navigation system 3 is mounted. Error in the position information is requested, and in the car navigation system 3 of the nearby vehicle, the error in the position information measured by the GPS of the own device is calculated, and the portable terminal 1 determines the GPS of the own device based on the error. Correct the position information measured with.

  FIG. 2 is a block diagram showing a schematic configuration of the mobile terminal 1 shown in FIG. Note that the configuration shown in FIG. 2 is simplified for the purpose of describing the present invention, and is assumed to include components mounted on a normal mobile terminal.

  The mobile terminal 1 includes a control unit 11 that controls the entire device, a communication control unit 12 that communicates with the car navigation system 3 and the server device 4 via the mobile communication network 2, and an input unit that inputs various data. 13, the display unit 14 for displaying various data and position information, the GPS 15 for measuring the position of the own device, and the position information by the GPS 15 is corrected based on the error information sent from the car navigation system 3 of the nearby vehicle. The correction unit 16 mainly includes an application control unit 17 that activates various applications that are installed in the apparatus or downloaded.

  The communication control unit 12 transmits the position information of its own device to the server device 4 when the position information correction application is activated, and the GPS position information error obtained by the navigation system 3 of the nearby vehicle. Receive information about. Further, in the position information correction application, the communication control unit 12 transmits a request signal for requesting an error calculation of position information to the car navigation system 3 and receives error information from the car navigation system 3. Further, the communication control unit 12 receives the nearby vehicle information from the server device 4.

  The GPS 15 detects the current position (latitude, longitude) of the mobile terminal 1 with a predetermined accuracy using a GPS satellite (not shown). The GPS 15 outputs the measured position information to the display unit 14 and outputs it to the correction unit 16 in the position information correction application. The position detection accuracy of the GPS 15 is lower than the position information accuracy of the car navigation system 3 obtained using detection information other than the GPS. For example, the position detection accuracy of the GPS 15 is normally 10 meters, and the car navigation system 3 The position detection accuracy is several meters.

  The correction unit 16 corrects the position information by the GPS 15 based on the error information sent from the car navigation system 3 of the nearby vehicle in the position information correction application. That is, the position information measured by the GPS 15 of the device itself is corrected using the error information between the highly accurate position information obtained by including the detection information other than GPS in the car navigation system 3 and the GPS position information. Further, the correction unit 16 outputs the corrected position information to the display unit 14.

  The application control unit 17 activates a position information correction application installed in the device or downloaded. The position information correction application extracts a nearby vehicle of the mobile terminal 1 on the server device 4 based on the position of the mobile terminal 1 and the position of the vehicle on which the car navigation system 3 is mounted. Error in the position information is requested, and in the car navigation system 3 of the nearby vehicle, the error in the position information measured by the GPS of the own device is calculated, and the portable terminal 1 determines the GPS of the own device based on the error. It is an application that corrects the position information measured by. In the mobile terminal 1, the position information of the own device is transmitted to the server device 4, and based on the nearby vehicle information received from the server device 4, the car navigation system 3 of the nearby vehicle is requested to calculate the position information error. Based on the calculated error information, the position information obtained by the GPS of the device itself is corrected.

  FIG. 3 is a block diagram showing a schematic configuration of the car navigation system 3 shown in FIG. Note that the configuration shown in FIG. 3 is simplified to explain the present invention, and it is assumed that the components mounted on the normal car navigation system are provided.

  The car navigation system 3 displays a control unit 31 that controls the entire device, a communication control unit 32 that communicates with the mobile terminal 1 and the server device 4 via the mobile communication network 2, and displays various data and information. Display unit 33, GPS 34 that measures the position of the device itself, map matching unit 35 that performs map matching using position information and other information, gyro sensor 36 that detects the angular velocity of the vehicle that is traveling, A vehicle speed sensor 37 for detecting the vehicle speed of the vehicle in the vehicle, an error calculation unit 38 for calculating an error in position information measured by the GPS 34, and an application control unit 39 for starting various applications installed in the device or downloaded. And is composed mainly of.

  The communication control unit 32 transmits the position information of the own apparatus to the server apparatus 4 when the position information correction application is activated. Further, the communication control unit 32 receives a signal for requesting an error calculation of the position information from the mobile terminal 1 and transmits information on the calculated error of the position information to the mobile terminal 1.

  The GPS 34 uses a GPS satellite (not shown) to detect the current position (latitude, longitude) of the car navigation system 3 with a predetermined accuracy. The GPS 34 outputs the measured position information to the map matching unit 35 and also outputs it to the error calculation unit 38 in the position information correction application. The position detection accuracy of the GPS 34 is usually in units of 10 meters.

  The map matching unit 35 uses the GPS positioning information, the angular velocity information obtained by the gyro sensor 36 (described later), and the vehicle speed information obtained by the vehicle speed sensor 37 on the map information stored or downloaded in advance. Maps the current position of. Further, the map matching unit 35 outputs the position information of the own vehicle obtained by the map matching to the display unit 33 and outputs to the error calculation unit 38 in the position information correction application.

  The gyro sensor 36 is composed of at least a biaxial acceleration sensor, and detects an angular velocity of a traveling vehicle. Information on the angular velocity detected by the gyro sensor 36 is output to the map matching unit 35. In addition, the vehicle speed sensor 37 detects the vehicle speed of the traveling vehicle. Information on the vehicle speed detected by the vehicle speed sensor is output to the map matching unit 35.

  The error calculation unit 38 obtains an error between the position information obtained by the GPS 34 and high-precision position information obtained by including the map matching unit 35, the gyro sensor 36, and the vehicle speed sensor 37 in the position information correction application. . In the error calculation unit 38, map mapping is performed by the map mapping unit 35 using position information (latitude and longitude) measured by the GPS 34, angular velocity information obtained by the gyro sensor 36, and vehicle speed information obtained by the vehicle speed sensor 37. The difference between the current position information (latitude and longitude) is obtained, and the difference is used as error information. The error information is transmitted to the mobile terminal 1 via the communication control unit 32.

  The application control unit 39 activates a position information correction application installed in the device or downloaded. The position information correction application extracts a nearby vehicle of the mobile terminal 1 on the server device 4 based on the position of the mobile terminal 1 and the position of the vehicle on which the car navigation system 3 is mounted. Error in the position information is requested, and in the car navigation system 3 of the nearby vehicle, the error in the position information measured by the GPS of the own device is calculated, and the portable terminal 1 determines the GPS of the own device based on the error. It is an application that corrects the position information measured by. In the car navigation system 3, the position information of the own device is transmitted to the server device 4, and the error of the GPS position information is calculated based on the error calculation request signal received from the mobile terminal 1.

  FIG. 4 is a block diagram showing a schematic configuration of the server device 4 shown in FIG. The configuration shown in FIG. 4 is simplified for explaining the present invention, and it is assumed that the components mounted on the normal server device are provided.

  The server device 4 includes a control unit 41 that controls the entire device, a communication control unit 42 that communicates with the mobile terminal 1 and the car navigation system 3 via the mobile communication network 2, and a mobile terminal for each specific area. An area information database (DB) 43 that manages the position of 1 and the position of the vehicle on which the car navigation system 3 is mounted, and a nearby vehicle information extraction unit that extracts a vehicle in the vicinity of the portable terminal 1 from the position information managed by the area information DB 43 44 and an application control unit 45 that activates various applications installed or downloaded in the apparatus.

  The communication control unit 42 receives the position information of the mobile terminal 1 and the car navigation system 3 when the position information correction application is activated, and also receives information on nearby vehicles extracted in the specific area with respect to the mobile terminal 1. Send.

  The area information DB 43 is a database that manages the position of the mobile terminal 1 and the position of the vehicle on which the car navigation system 3 is mounted in a specific area. The area information DB 43 has a management table as shown in FIG. In the management table shown in FIG. 5, in a specific area (area A), the mobile terminal (terminal 001, terminal 003) and the car navigation system (car navigation 011, car navigation 012, car navigation 015) are displayed as positional information (latitude, longitude). We manage with. In the area information DB 43, attribute information and identification information are included in the information sent from the mobile terminal 1 and the car navigation system 3, and such attribute information and identification information are also managed. Note that the management items and management methods in the management table shown in FIG. 5 are not limited to this, and various changes can be made.

  The nearby vehicle information extraction unit 44 extracts a vehicle in the vicinity of the mobile terminal 1 from the position information managed by the area information DB 43. As shown in FIG. 5, the area information DB 43 manages the position of the mobile terminal 1 and the position of the vehicle on which the car navigation system 3 is mounted in a specific area while sequentially updating it. The nearby vehicle information extraction unit 44 refers to the area information DB 43 in the position information correction application and extracts a vehicle in the vicinity of the mobile terminal 1. Information on this nearby vehicle is transmitted to the mobile terminal 1 via the communication control unit 42.

  The application control unit 45 activates a position information correction application installed in the device or downloaded. The position information correction application extracts a nearby vehicle of the mobile terminal 1 on the server device 4 based on the position of the mobile terminal 1 and the position of the vehicle on which the car navigation system 3 is mounted. Error in the position information is requested, and in the car navigation system 3 of the nearby vehicle, the error in the position information measured by the GPS of the own device is calculated, and the portable terminal 1 determines the GPS of the own device based on the error. It is an application that corrects the position information measured by. In the server device 4, position information from the mobile terminal 1 and the car navigation system 3 is managed, a nearby vehicle of the mobile terminal 1 is extracted in a specific area, and the nearby vehicle information is transmitted to the mobile terminal 1.

Next, the positional information correction method according to the embodiment of the present invention will be described with reference to FIG.
In the position information correction method of the present invention, the server device extracts a vehicle in the vicinity of the portable terminal device based on the position of the portable terminal device and the position of the vehicle on which the car navigation system is mounted, and the portable terminal device Requesting calculation of positional information error for the extracted nearby vehicle, calculating error of positional information measured by GPS of its own device in the car navigation system of the nearby vehicle, and the portable terminal device However, based on the error, the position information measured by the GPS of its own device is corrected.

  When the position information correction application is tracked by the application control units 17, 39, and 45 of the mobile terminal 1, the car navigation system 3, and the server device 4, the position information of the mobile terminal 1 and the position of the vehicle on which the car navigation system 3 is mounted Information is transmitted to the server device 4 (ST11, ST12). This position information is registered in the area information DB 43 of the server device 4. The registration of the position information is performed at least once, and when a plurality of registrations are performed within a predetermined time, the information in the area information DB 43 is sequentially updated.

  In the server device 4, the nearby vehicle information extraction unit 44 refers to the area information DB 43, and in the specific area, from the position information of the mobile terminal 1 using this service and the position information of the vehicle equipped with the car navigation system 3, The vehicle currently closest to the mobile terminal 1 using this service is extracted (ST13). And the information of the extracted nearby vehicle is transmitted to the portable terminal 1 which uses this service via the communication control part 42 (ST14). The mobile terminal 1 receives information on nearby vehicles via the communication control unit 12. The information on the nearby vehicle includes identification information on the nearby vehicle (car navigation system).

  Based on the identification information of the nearby vehicle included in the nearby vehicle information, the mobile terminal 1 using this service transmits a signal requesting an error calculation of the position information to the nearby vehicle via the communication control unit 12. (ST15). When the car navigation system 3 of the nearby vehicle receives the error calculation request signal from the portable terminal 1, it calculates the error of the GPS position information (ST16). That is, the GPS 34 measures the current position of its own device, detects the angular velocity using the gyro sensor 36, detects the vehicle speed using the vehicle speed sensor 37, and uses the GPS position information, the angular velocity, and the vehicle speed to map information. Perform map matching on top. Then, the position information on the map information subjected to the map matching is compared with the position information obtained only by the GPS, and the difference is calculated as an error. Then, the calculated error information is transmitted to the mobile terminal 1 using this service via the communication control unit 32 (ST17). The mobile terminal 1 receives error information via the communication control unit 12.

  The mobile terminal 1 using this service corrects the position information measured by the GPS 15 of the own device based on the error information (ST18). The position information corrected in this way is displayed on the display unit 14.

  As described above, in the position information correction system according to the present embodiment, the server device 4 extracts the nearby vehicle of the mobile terminal 1 based on the position of the mobile terminal 1 and the position of the vehicle on which the car navigation system 3 is mounted. The mobile terminal 1 requests the calculation of the positional information error with respect to the nearby vehicle, and in the car navigation system 3 of the nearby vehicle, calculates the positional information error measured by the GPS of its own device. Based on the error, the position information measured by the GPS of its own device is corrected, that is, using the highly accurate position information obtained by the vehicle in the vicinity of the mobile terminal 1, the error from the position information obtained only by the GPS 34 is corrected. Since the position information of the portable terminal 1 is corrected using the error information, the position information measured by the GPS 15 is corrected while avoiding an increase in the calculation load and an increase in size of the portable terminal 1. Door can be.

  For example, when a pedestrian carrying a mobile terminal is walking near a glass building with good reception of radio waves from GPS satellites, the GPS function of the mobile terminal is "pretty accurate location information" The position affected by the glass building is shown, and the position greatly deviates from the actual position. According to the system of the present invention, a vehicle passing near a pedestrian can obtain accurate position information without being affected by a glass building by the map matching function. By calculating the error from the high-accuracy position information by the GPS and the position information of only the GPS function and sending the error information to the mobile terminal, it is possible to correct the position information of the own device using the error information Become.

  Also, in this system, while walking in a building street, the GPS satellite is blocked by the building, so some of the location information of the mobile terminal is location information affected by the building (building). Of these pieces of position information, it is also possible to determine which position information is accurate (not affected by the building).

  The present invention is not limited to the embodiment described above, and can be implemented with various modifications. For example, the processing unit and the processing procedure can be changed as appropriate without departing from the scope of the present invention. Other modifications can be made without departing from the scope of the present invention.

It is a figure which shows schematic structure of the positional information correction system which concerns on embodiment of this invention. It is a block diagram which shows schematic structure of the portable terminal in the system shown in FIG. It is a block diagram which shows schematic structure of the car navigation system in the system shown in FIG. It is a block diagram which shows schematic structure of the server apparatus in the system shown in FIG. It is a figure which shows the example of the management table in the area information database of a server apparatus. It is a sequence diagram for demonstrating the positional information correction method which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Portable terminal 2 Mobile communication network 3 Car navigation system 4 Server apparatus 11, 31, 41 Control part 12, 32, 42 Communication control part 13 Input part 14, 33 Display part 15, 34 GPS
16 Correction unit 17, 39, 45 Application control unit 35 Map matching unit 36 Gyro sensor 37 Vehicle speed sensor 38 Error calculation unit 43 Area information DB
44 Nearby car information extraction unit

Claims (6)

  A management unit that manages the position of the mobile terminal device and the position of the vehicle on which the car navigation system is mounted, and a server device that includes a nearby vehicle extraction unit that extracts a vehicle in the vicinity of the mobile terminal device from the position information; 1 GPS and a vehicle equipped with a car navigation system having a calculation means for calculating an error of position information measured by the first GPS, and the second GPS and position information measured by the second GPS based on the error information are corrected. A position information correction system comprising: a portable terminal device having correction means for performing the correction.   The position information correction system according to claim 1, wherein the car navigation system includes a gyro sensor, a vehicle speed sensor, and map matching means.   The position information correction system according to claim 1, wherein the management unit manages the position of the mobile terminal device and the position of the vehicle on which the car navigation system is mounted for each specific area.   In the server device, a step of extracting a vehicle in the vicinity of the mobile terminal device based on the position of the mobile terminal device and the position of the vehicle on which the car navigation system is mounted, and the mobile terminal device in the extracted nearby vehicle Requesting the calculation of position information error to the vehicle, calculating the error of position information measured by the GPS of its own device in the car navigation system of the nearby vehicle, and the portable terminal device And a step of correcting the position information measured by the GPS of the own device based on the position information correction method.   5. The position information correction method according to claim 4, wherein the car navigation system calculates an error of the position information measured by the GPS of its own device using a gyro sensor, a vehicle speed sensor, and a map matching means.   The said server apparatus extracts the vehicle of the vicinity of the said portable terminal device from the position of the portable terminal device in a specific area, and the position of the vehicle carrying a car navigation system. Position information correction method.

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