JP2003348633A - Mobile communication terminal, navigation system, and computer program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a car navigation system to quickly acquire an initial location at start. <P>SOLUTION: An onboard terminal receives a base station signal from a base station when an automobile is at a halt, transmits a measurement result of the base station signal to a location server when the automobile is driven, and outputs a particular result denoting its own location received from the location server to the car navigation system. The car navigation system processes the particular result received from the onboard terminal as an initial location to quickly acquire the initial location (current location) at start. <P>COPYRIGHT: (C)2004,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position server configured to specify the position of a mobile communication terminal based on a measurement result of a base station signal or a GPS satellite signal received from the mobile communication terminal. The present invention relates to a mobile communication terminal used in a position specifying system including a mobile communication terminal, a navigation system including the mobile communication terminal and a navigation device, and a computer program executed by the mobile communication terminal.

[0002]

As one of the position specifying systems for specifying the position of a mobile communication terminal such as a portable telephone, a base station signal from a base station or a GPS (Global Positioning System) is used.
Some systems use GPS satellite signals from satellites. In this case, when the mobile communication terminal attempts to specify its own position, the mobile communication terminal needs to hold the almanac information of the base station and the almanac information of the GPS satellite, and the mobile communication terminal performs complicated calculations. Therefore, there is a situation that the price of the mobile communication terminal is increased and the configuration is complicated.

[0003] Against this background, the location server holds the almanac information of the base station and the almanac information of the GPS satellites, and the mobile communication terminal transmits the measurement results of the base station signals and the GPS satellite signals to the location server. Assisted positioning type systems in which a position server specifies the position of a mobile communication terminal based on a measurement result of a base station signal received from the mobile communication terminal or a measurement result of a GPS satellite signal have become widespread.

On the other hand, in recent years, a single positioning type navigation device configured to be able to specify a position independently, such as a car navigation device mounted on an automobile, has become widespread. However, if this type of single positioning type navigation device is a device that specifies a position using a GPS satellite signal from a GPS satellite, when it is started (starts operation), it searches all GPS satellites. Since a GPS satellite signal is received from a GPS satellite that has been successfully searched, the received GPS satellite signal is measured, and a position is specified based on the measurement result of the GPS satellite signal. There is a problem that it takes time, that is, it takes a lot of time to acquire an initial position (current position) at the time of activation.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to enable a navigation device configured to be able to specify a position independently to quickly acquire an initial position at the time of starting. To provide a mobile communication terminal, a navigation system, and a computer program.

[0006]

According to the mobile communication terminal of the present invention, the control unit receives the base station signal when the navigation device configured to be able to specify the position alone is inactive. Means for receiving a base station signal and means for receiving a GPS satellite signal by means of a GPS satellite signal receiving means. Then, the control unit causes the communication unit to transmit the measurement result of the base station signal and the measurement result of the GPS satellite signal to the position server, and outputs the specific result received from the position server by the communication unit to the navigation device from the output unit.

That is, the mobile communication terminal receives a base station signal or a GPS satellite signal when the navigation device is in a non-operation state, and outputs a specified result indicating its own position specified in cooperation with the position server to the navigation device. , The navigation device processes the specified result input from the mobile communication terminal at the time of activation as an initial position at the time of activation, thereby quickly acquiring the initial position at the time of activation.

According to the mobile communication terminal of the present invention, the control means integrates the measurement result of the base station signal when the mobile communication terminal is stopped, and the measurement result of the integrated base station signal. Is transmitted from the communication means to the location server.
That is, the mobile communication terminal integrates (averages) the measurement result of the base station signal when the mobile communication terminal is stopped, because the base station is in a fixed state (the installation position is unchanged).
By doing so, the accuracy of the measurement result of the base station signal can be improved, and accordingly, the navigation device can input a highly accurate specific result from the mobile communication terminal when started, and the accuracy can be improved. It is possible to obtain a high initial position.

According to the third aspect of the present invention, the control means integrates the specific result received from the position server by the communication means, and outputs the integrated specific result to the navigation device from the output means. In other words, the mobile communication terminal integrates (averages) the specific result received from the position server, thereby obtaining the measurement result of the base station signal and the G value.
The accuracy of the specific result based on the measurement result of the PS satellite signal can be improved, and accordingly, the navigation device can be connected to the mobile communication terminal when activated, in the same manner as described in claim 2 above. It is possible to input a specific result with high accuracy, and it is possible to obtain an initial position with high accuracy.

According to the mobile communication terminal of the present invention, the control means determines whether the search for the GPS satellites has succeeded or failed, and if it determines that the search for the GPS satellites has failed, the base station signal. The base station signal is received by the receiving means, and when it is determined that the search for the GPS satellite is successful, the GPS satellite signal receiving means determines that the GPS satellite signal has been successfully received.
The satellite signal reception operation is performed.

That is, in an environment where a GPS satellite cannot be searched well, for example, indoors,
Since the satellite search is likely to fail, even if the GPS satellite search fails, it is possible to output a specific result based on the measurement result of the base station signal to the navigation device. The device can acquire the initial position based on the measurement result of the base station signal.

On the other hand, in an environment where a mobile communication terminal can search for a GPS satellite well, for example, outdoors, the
Since there is a high possibility that the search for the S satellite is successful, if the search for the GPS satellite is successful, it is possible to output a specific result based on the measurement result of the GPS satellite signal to the navigation device. Is the GP
It is possible to acquire the initial position based on the measurement result of the S satellite signal. Also, in this case, it is generally possible to acquire an initial position with higher accuracy than when acquiring an initial position based on a measurement result of a base station signal.

According to the mobile communication terminal of the present invention, the car navigation apparatus is configured to be in the operating state when the vehicle is in the running state and to be in the inactive state when the vehicle is in the stopped state. Therefore, for example, when the user gets into the vehicle, starts driving, and when the car navigation device is activated, the initial position (current position) of the vehicle can be promptly acquired, and usability is improved. it can.

According to the navigation system of the present invention, the navigation device processes the specifying result input from the mobile communication terminal as an initial position at the time of activation, and then specifies the position independently. It is possible to release the communication between the mobile communication terminal and the location server, and if the communication fee for the communication between the mobile communication terminal and the location server is a contract for a pay-per-use system, the mobile communication terminal and By releasing communication with the location server, communication costs can be reduced.

According to the computer program described in claim 8, the position of the mobile communication terminal is determined based on the measurement result of the base station signal and the GPS satellite signal received from the mobile communication terminal. Used in a position specifying system including a position server configured to specify, and installed and executed in a mobile communication terminal used with a navigation device configured to be able to specify a position alone, the navigation device, A procedure for performing a receiving operation of a base station signal from a base station or a receiving operation of a GPS satellite signal from a GPS satellite when in a non-operation state, and transmitting a measurement result of a base station signal or a measurement result of a GPS satellite signal to a position server. For transmitting the specified result received from the position server to the navigation device Since so to run, it is possible to obtain the same effects as those described in claim 1 described above. In other words, the navigation device processes the specified result input from the mobile communication terminal at the time of activation as the initial position at the time of activation, thereby making it possible to quickly acquire the initial position at the time of activation.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment in which the mobile communication terminal of the present invention is applied to an in-vehicle terminal mounted on an automobile will be described below with reference to FIGS. Note that the in-vehicle terminal referred to here may be configured as a single unit and configured to be detachable from the vehicle, or may be built into the vehicle at the manufacturing stage (moduleed). It may be.

First, FIG. 3 schematically shows the entire configuration of the system. The in-vehicle terminal 1 is mounted on an automobile 2 (vehicle in the present invention), determines a communication base station from a plurality of base stations 3 based on, for example, the reception strength of a base station signal, and uses the determined communication base station. CDMA (Code Divis
Various signals are transmitted / received to / from the location server 5 through the network 4. The in-vehicle terminal 1 and the location server 5 use a GPS (Global Positioning Sys
tem) A GPS satellite signal is received from the satellite 6. Further, the position server 5 holds almanac information on the base station 3 (installation position, antenna direction (directivity), service area, etc.) and almanac information on the GPS satellites 6.

The car navigation device 7 (navigation device according to the present invention) is mounted on the automobile 2 together with the above-mentioned in-vehicle terminal 1, receives a GPS satellite signal from the GPS satellite 6, and based on the measurement result of the GPS satellite signal. To specify the position (current position). In this case, when the ignition key switch of the automobile 2 is turned on, the car navigation device 7 is supplied with operating power from a battery (not shown) and is in an operating state.
When the ignition key switch is turned off, the supply of the operating power is stopped to be in a non-operating state.

Further, the position specifying system referred to in the present invention comprises:
The in-vehicle terminal 1 and the position server 5 are configured as constituent elements, and the navigation system according to the present invention is configured with the in-vehicle terminal 1 and the car navigation device 7 as constituent elements.

FIG. 4 is a functional block diagram showing the electrical configuration of the vehicle-mounted terminal 1. The in-vehicle terminal 1 has a CPU (Central Processing Unit) 8 (control means according to the present invention) executing a control program (computer program according to the present invention) provided to a GPS radio unit 9 (receiving a GPS satellite signal from the GPS satellite 6). A CDMA radio unit 10 (a base station according to the present invention) that receives a base station signal from the base station 3 and transmits and receives various signals to and from the location server 5 through the CDMA network 4. Station signal receiving means, communication means), a display unit 11 composed of, for example, a liquid crystal display, and a RAM (Ra
a storage unit 12 including an ndom access memory (ROM) and a read only memory (ROM);
A car navigation device I / F unit 13 (an output unit in the present invention) having an interface function between the vehicle and a vehicle that inputs vehicle information indicating the state of the vehicle 2 (for example, whether the vehicle is running or stopped). The configuration is such that the information I / F unit 14 is connected. In this case, the configuration may be such that the antenna of the GPS radio unit 9 and the antenna of the CDMA radio unit 10 are also used.

Next, the operation of the above configuration will be described with reference to FIGS. 1, 2, 5 and 6. Here, FIGS. 1 and 2 schematically show a time-series signal flow between the position server 5, the in-vehicle terminal 1, the car navigation device 7, and the car 2. FIGS. 5 and 6 show, as a flowchart, a process executed by the CPU 8 of the vehicle-mounted terminal 1. In addition, here, the in-vehicle terminal 1
Has established communication with the location server 5 and is required to search for a GPS satellite 6 from the location server 5.
When the S satellite search assist information is received, the received G
The following description is based on the premise that PS satellite search assist information is stored in the storage unit 12.

First, in the in-vehicle terminal 1, the CPU 8
Under the preconditions described above, a stop signal indicating that the vehicle 2 is stopped is input by the vehicle information I / F unit 14 and when it is detected that the vehicle 2 is stopped (at step S1). “YES”), it is determined whether or not valid GPS satellite search assist information is stored in the storage unit 12 (step S2). In this case, the valid GPS satellite search assist information indicates, for example, information stored in the storage unit 12 at a new time in chronological order. At this time, the car navigation device 7 is in a non-operating state with the car 2 stopped.

When the valid GPS satellite search assist information is stored in the storage unit 12 ("YES" in step S2), the CPU 8 stores the relevant GPS satellite search assistance information in the corresponding GP.
The S satellite search assist information is read (step S3), and the GPS is searched based on the read GPS satellite search assist information.
The satellite 6 is searched (step S4).

On the other hand, the CPU 8 has a valid GPS
If the satellite search assist information is not stored in the storage unit 12 ("NO" in step S2), an assist information request is sent from the CDMA radio unit 10 through the CDMA network 4 to request the GPS satellite search assist information from the position server 5. It is transmitted to the position server 5 (step S5).

Upon receiving the request, the position server 5 transmits the GPS satellite search assist information to the vehicle-mounted terminal 1 through the CDMA network 4 when receiving the assist information request from the vehicle-mounted terminal 1.

In the on-board terminal 1, when the GPS satellite search assist information is received by the CDMA radio unit 10 from the position server 5 (step S6), the storage unit 1
2 is updated (step S7), and the GPS satellite 6 is searched based on the updated GPS satellite search assist information (step S7).
8).

Now, the CPU 8 executes the GPS
As a result of the search for the satellite 6, if the search for the GPS satellite 6 fails, for example, because the in-vehicle terminal 1 is located in an environment where the GPS satellite 6 cannot be searched satisfactorily such as indoors ("NO" in step S9). )), The base station signal reception mode is set (step S10).

Next, the CPU 8 operates the CDMA radio unit 10.
Performs the operation of receiving the base station signal from the base station 3 (step S11). Then, the CPU 8 measures the received base station signal (step S12), integrates (averages) the measurement result of the base station signal (step S13), and stores the integrated measurement result of the base station signal in the storage unit 12. (Step S14).

Next, the CPU 8 determines again whether or not the automobile 2 is stopped by determining again whether or not the stop signal is input by the vehicle information I / F unit 14 (step S15). Then, when detecting that the vehicle 2 is stopped ("YES" in step S15), the CPU 8 returns to step S10, and repeats and executes the above-described processing.

On the other hand, the CPU 8 controls the GPS satellite 6
As a result of the search, for example, when the in-vehicle terminal 1 is located in an environment where the GPS satellites 6 can be favorably searched, such as outdoors, and the search for the GPS satellites 6 is successful (“YES” in step S9), The GPS satellite signal reception mode is set (step S16).

Next, the CPU 8 performs an operation of receiving a GPS satellite signal from the GPS satellite 6 by the GPS radio unit 9 (step S17). Then, the CPU 8 measures the received GPS satellite signal (step S18), and stores the measurement result of the GPS satellite signal in the storage unit 12 (step S19).

Next, also in this case, the CPU 8 determines again whether or not the vehicle 2 is stopped by determining again whether or not the stop signal is input by the vehicle information I / F unit 14 (see FIG. 4). Step S20). And CP
When U8 detects that the vehicle 2 is stopped ("YES" in step S20), in this case, the process returns to step S2 and repeats the above-described processing.

As described above, the in-vehicle terminal 1 performs the operation of receiving the base station signal from the base station 3 while the car 2 is stopped and the search for the GPS satellite 6 has failed. Iteratively, the measurement result of the base station signal is integrated, and the measurement result of the integrated base station signal is stored. In addition, in the on-board terminal 1, the car 2 is stopped, and G
While the search for the PS satellite 6 is successful, the operation of receiving the GPS satellite signal from the GPS satellite 6 is repeatedly performed, and the GPS
The measurement result of the satellite signal will be stored.

After the vehicle 2 has stopped and the search for the GPS satellites 6 has been successful, the on-board terminal 1
If the search for satellite 6 fails, the GPS
By performing the operation of receiving the base station signal from the base station 3 after performing the operation of receiving the satellite signal, both the measurement result of the GPS satellite signal and the measurement result of the integrated base station signal are stored. .

When the CPU 8 receives a travel signal indicating that the vehicle 2 is traveling through the vehicle information I / F unit 14 and detects that the vehicle 2 is traveling ("NO" in step S15). Or "NO" in step S20), the positioning request and the measurement result stored in the storage unit 12 to request the position server 5 to perform the CDMA.
The transmission is transmitted from the wireless unit 10 to the location server 5 through the CDMA network 4 (step S21). Note that, at this time, the car navigation device 7 is in an operating state as the automobile 2 is running.

Here, if only the measurement result of the integrated base station signal is stored in the storage unit 12, the CPU 8 causes the position server 5 to transmit only the measurement result of the integrated base station signal. If only the measurement result of the GPS satellite signal is stored in the storage unit 12, only the measurement result of the GPS satellite signal is transmitted to the position server 5, and the measurement result of the integrated base station signal is further transmitted. And G
If both of the measurement results of the PS satellite signal are stored in the storage unit 12, the measurement result of the integrated base station signal and the GP
Both or any one of the measurement results of the S satellite signal is selected and transmitted to the position server 5.

In response to this, when the positioning request and the measurement result of the base station signal and the measurement result of the GPS satellite signal are received from the on-board terminal 1, the position server 5 receives the measurement result of the received base station signal and the GPS signal. The position of the in-vehicle terminal 1 is specified based on the measurement result of the satellite signal.

Here, when the position server 5 receives only the measurement result of the integrated base station signal from the on-board terminal 1,
The position of the in-vehicle terminal 1 is specified based only on the measurement result of the integrated base station signal. When only the measurement result of the GPS satellite signal is received from the in-vehicle terminal 1, GP
The position of the in-vehicle terminal 1 is specified based only on the measurement result of the S satellite signal, and both the measurement result of the integrated base station signal and the measurement result of the GPS satellite signal are received from the in-vehicle terminal 1. Then, the position of the vehicle-mounted terminal 1 is specified based on both the integrated base station signal measurement result and the GPS satellite signal measurement result.

The location server 5 transmits the identification result indicating the location of the on-board terminal 1 identified in this way to the CDMA.
The information is transmitted to the in-vehicle terminal 1 through the network 4.

In the in-vehicle terminal 1, when the specific result is received by the CDMA radio unit 10 from the position server 5 (step S22), the CPU 8 transmits the received specific result from the car navigation device I / F unit 13 to the car navigation device. 7 (step S23).

In response, the car navigation system 7
When a specific result is input from the in-vehicle terminal 1, the input specific result is processed as an initial position at the time of startup, and the initial position is displayed on a display device as a current position. Thereafter, the car navigation device 7 shifts to the stand-alone mode for specifying the position independently,
By receiving the PS satellite signal, the position is specified independently, and the position specified alone is displayed on the display device as the current position.

As described above, when the car navigation device 7 is started, the identification result representing the position of the in-vehicle terminal 1 specified by the cooperation between the in-vehicle terminal 1 and the location server 5 is input from the in-vehicle terminal 1. Then, by processing the input specific result as the initial position at the time of activation, it is possible to quickly acquire the initial position at the time of activation.

FIG. 1 shows that the on-board terminal 1 stores valid GPS satellite search assist information and that the on-board terminal 1
Since the search for the S satellite signal failed, the location server 5
Identifies the position of the in-vehicle terminal 1 based on the measurement result of the base station signal, and the car navigation device 7 processes the identification result based on the measurement result of the base station signal input from the in-vehicle terminal 1 as an initial position at the time of startup. 4 schematically shows a time-series signal flow in the case of the above.

FIG. 2 shows that the on-board terminal 1 stores valid GPS satellite search assist information and that the on-board terminal 1
Since the search for the S satellite signal was successful, the location server 5
Specifies the position of the in-vehicle terminal 1 based on the measurement result of the GPS satellite signal, and the car navigation device 7 processes the specified result based on the measurement result of the GPS satellite signal input from the in-vehicle terminal 1 as an initial position at the time of startup. 4 schematically shows a time-series signal flow in the case of the above.

By the way, the above description is based on the in-vehicle terminal 1.
Prior to detecting that the vehicle 2 has stopped, communication has been established with the location server 5 and the location server 5
Has been described assuming that the GPS satellite search assist information is received from the GPS server.
The same applies to the case where communication is established with the GPS server and GPS satellite search assist information is received from the position server 5.

As described above, according to the first embodiment, when the vehicle 2 is stopped, the in-vehicle terminal 1 receives a base station signal from the base station 3 or receives a GPS signal from the GPS satellite 6. When the vehicle 2 travels by performing a satellite signal receiving operation, the base station transmits the measurement result of the base station signal and the measurement result of the GPS satellite signal to the position server 5 and receives the identification result indicating the own position received from the position server 5. It is configured to output to the car navigation device 7. Therefore, the car navigation device 7 can quickly acquire the initial position at the time of activation by processing the specific result input from the in-vehicle terminal 1 at the time of activation as the initial position at the time of activation.

In this case, in the in-vehicle terminal 1, with respect to the base station signal from the base station 3, the measurement result of the base station signal is integrated when the automobile 2 is stopped, and the integrated base station signal is obtained. Since the measurement result is configured to be transmitted to the position server 5, the measurement result of the base station signal is integrated when the vehicle 2 is stopped, because the base station 3 is in a fixed state (the installation position is unchanged). By performing (averaging), the accuracy of the measurement result of the base station signal can be improved, and accordingly, the car navigation device 7 can input a highly accurate specific result from the in-vehicle terminal 1 when activated. Becomes possible, and it becomes possible to acquire an initial position with high accuracy.

In this case, the on-board terminal 1
When it is determined that the search for the PS satellite 6 has failed, the base station signal receiving operation is performed. Therefore, in an environment where the GPS satellite 6 cannot be searched well, for example, indoors, the GP
Since the search for the S satellite 6 is likely to fail, even if the search for the GPS satellite 6 fails, it is possible to output a specific result based on the measurement result of the base station signal to the car navigation device 7. Accordingly, the car navigation device 7 can acquire the initial position based on the measurement result of the base station signal.

On the other hand, in the on-board terminal 1, the GP
When it is determined that the search for the S satellite 6 is successful, the GPS satellite signal receiving operation is performed. Therefore, in an environment where the GPS satellite 6 can be searched well, for example, outdoors,
Since the search for the S satellite 6 is likely to be successful, if the search for the GPS satellite 6 is successful, it is possible to output a specific result based on the measurement result of the GPS satellite signal to the car navigation device 7, Thus, the car navigation device 7 can acquire the initial position based on the measurement result of the GPS satellite signal.

Further, in this case, the car navigation device 7 processes the identification result input from the in-vehicle terminal 1 as an initial position at the time of activation, and then shifts to a stand-alone mode in which the position is identified alone. Since the position is specified independently by receiving the GPS satellite signal, the communication between the in-vehicle terminal 1 and the position server 5 can be opened thereafter.
Further, if the communication fee for the communication between the in-vehicle terminal 1 and the location server 5 is a contract based on the pay-as-you-go system, the communication between the in-vehicle terminal 1 and the location server 5 is released to reduce the communication cost. It becomes possible.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS. still,
The description of the same parts as those in the first embodiment is omitted, and different parts will be described. The first embodiment described above is configured such that the in-vehicle terminal 1 integrates the measurement result of the base station signal to improve the accuracy of the specific result processed by the car navigation device 7 as the initial position. On the other hand, in the second embodiment, the in-vehicle terminal 1 integrates the specific result received from the position server 5 to improve the accuracy of the specific result processed by the car navigation device 7 as the initial position. Things.

That is, in the in-vehicle terminal 1, the CPU 8
When measuring a base station signal (step S12) or measuring a GPS satellite signal (step S18),
In order to request the position server 5 for positioning, the positioning request and the measurement result of the base station signal and the measurement result of the GPS satellite signal are CDMA.
The transmission is transmitted from the wireless unit 10 to the location server 5 through the CDMA network 4 (step S31).

In response to this, when the positioning request and the measurement result of the base station signal and the measurement result of the GPS satellite signal are received from the on-board terminal 1, the position server 5 receives the measurement result of the received base station signal and the GPS signal. The position of the in-vehicle terminal 1 is specified based on the measurement result of the satellite signal.

Also here, when only the measurement result of the base station signal is received from the on-board terminal 1, the location server 5 specifies the position of the on-board terminal 1 based only on the measurement result of the base station signal. Further, when only the measurement result of the GPS satellite signal is received from the on-board terminal 1, the position of the on-board terminal 1 is specified based on only the measurement result of the GPS satellite signal. When both the measurement result of the GPS satellite signal and the measurement result of the GPS satellite signal are received, the position of the vehicle-mounted terminal 1 is specified based on both the measurement result of the base station signal and the measurement result of the GPS satellite signal.

Then, the position server 5 transmits the identification result indicating the position of the vehicle-mounted terminal 1 identified in this way to CDMA.
The information is transmitted to the in-vehicle terminal 1 through the network 4.

In the in-vehicle terminal 1, when the specific result is received by the CDMA radio unit 10 from the position server 5 (step S32), the CPU 8 integrates (averages) the received specific result (step S33), and The specified result is stored in the storage unit 12 (step S34).

Next, the CPU 8 determines again whether or not the automobile 2 is stopped by determining again whether or not the stop signal has been input by the vehicle information I / F unit 14 (step S35). Then, when detecting that the vehicle 2 is stopped ("YES" in step S35), the CPU 8 returns to step S2 and repeats the above-described processing.

On the other hand, when the CPU 8 detects that the car 2 is running ("N" in step S35).
O "), the integrated specific result stored in the storage unit 12 is output from the car navigation device I / F unit 13 to the car navigation device 7 (step S36).

In response, the car navigation device 7
When the integrated specific result is input from the vehicle-mounted terminal 1, the integrated specific result is processed as an initial position at the time of startup, and the initial position is displayed on the display device as the current position. Then, the car navigation device 7 operates in the same manner as described in the first embodiment,
Go to stand-alone mode to locate the location alone,
By receiving a GPS satellite signal from the GPS satellite 6, the position is specified independently, and the position specified alone is displayed on the display device as the current position.

As described above, also in this case, in the same manner as described in the first embodiment, when the car navigation device 7 starts up, the car navigation device 7 cooperates with the on-board terminal 1 and the position server 5. By inputting the identification result representing the position of the in-vehicle terminal 1 specified by the above from the in-vehicle terminal 1, and processing the input identification result as an initial position at the time of activation,
It is possible to quickly acquire the initial position at the time of startup.

FIG. 7 shows that the vehicle-mounted terminal 1 stores valid GPS satellite search assist information in the processing described above, and that the vehicle-mounted terminal 1
Since the search for the S satellite signal failed, the location server 5
Specifies the position of the in-vehicle terminal 1 based on the measurement result of the base station signal, the in-vehicle terminal 1 integrates the specification result received from the position server 5, and the car navigation device 7
4 schematically illustrates a time-series signal flow in the case where an integrated specific result based on a measurement result of a base station signal input from is processed as an initial position at the time of startup.

FIG. 8 shows that the on-board terminal 1 stores valid GPS satellite search assist information and that the on-board terminal 1
Since the search for the S satellite signal was successful, the location server 5
Specifies the position of the in-vehicle terminal 1 based on the measurement result of the GPS satellite signal, the in-vehicle terminal 1 integrates the identification result received from the position server 5, and the car navigation device 7 outputs the GPS satellite input from the in-vehicle terminal 1. 5 schematically illustrates a time-series signal flow when an integrated specific result based on a signal measurement result is processed as an initial position at the time of activation.

As described above, according to the second embodiment, the in-vehicle terminal 1 integrates the specific result received from the position server 5 and outputs the integrated specific result to the car navigation device 7. With the configuration, by integrating (averaging) the specific result received from the position server 5, the accuracy of the specific result based on the measurement result of the GPS satellite signal and the measurement result of the base station signal can be improved. As a result, the car navigation device 7 can input a highly accurate specific result from the in-vehicle terminal 1 when it is started up in the same manner as described in the first embodiment, The position can be obtained.

(Other Embodiments) The present invention is not limited to the above-described embodiment, but can be modified or expanded as follows. The mobile communication terminal is not limited to the in-vehicle terminal, and may be another type such as a mobile phone or a portable information terminal having a communication function. Further, the navigation device is not limited to a car navigation device mounted on an automobile, and may be a portable navigation device that can be carried by a person.

The control program executed by the CPU of the in-vehicle terminal is not limited to the program stored from the beginning (for example, from the stage of commercialization). For example, the control program may be downloaded from a specific server via a network, or may be stored in a CD-ROM (Comp
It may be installed by being transferred from a recording medium such as an act disk-read only memory) or a card.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a processing flow of a first embodiment of the present invention.

FIG. 2 is a diagram corresponding to FIG.

FIG. 3 is a diagram schematically showing an overall configuration of a system.

FIG. 4 is a functional block diagram showing an electric configuration of the vehicle-mounted terminal.

FIG. 5 is a flowchart showing processing performed by the vehicle-mounted terminal (part 1).

FIG. 6 is a flowchart illustrating processing performed by the in-vehicle terminal (part 2).

FIG. 7 is a diagram schematically showing a processing flow of a second embodiment of the present invention.

FIG. 8 is a diagram corresponding to FIG. 7;

FIG. 9 is a diagram corresponding to FIG. 5;

FIG. 10 is a diagram corresponding to FIG. 6;

[Explanation of symbols]

In the drawings, 1 is an on-board terminal (mobile communication terminal), 2 is an automobile (vehicle), 3 is a base station, 5 is a location server, 6 is a GPS satellite, 7 is a car navigation device (navigation device), and 8 is a CPU (controller). Means, 9 is a GPS radio unit (G
PS satellite signal receiving means) and 10 are CDMA radio units (base station signal receiving means, communication means).

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Tatsuya Shinobi             1-1, Showa-cho, Kariya-shi, Aichi Pref.             Inside DENSO (72) Inventor Toshihiro Takeuchi             1-1, Showa-cho, Kariya-shi, Aichi Pref.             Inside DENSO F term (reference) 2F029 AA02 AB07 AC02 AD01                 5H180 AA01 BB04 FF05 FF13 FF27                       FF33                 5K067 AA33 BB36 BB41 BB43 CC10                       DD11 EE02 EE07 EE10 FF03                       HH21 JJ52                 5K101 KK08 KK15 LL12 MM06 RR12

Claims (8)

[Claims] 1. A position specifying apparatus comprising: a position server configured to specify a position of a mobile communication terminal based on a measurement result of a base station signal or a GPS satellite signal received from the mobile communication terminal. What is claimed is: 1. A mobile communication terminal used with a navigation device configured to be able to specify a position independently while being used in a system, comprising: a base station signal receiving means for receiving a base station signal from a base station; and a GPS satellite signal from a GPS satellite. And a GPS satellite signal receiving means for transmitting the measurement result of the base station signal and the measurement result of the GPS satellite signal to the position server, and receiving the identification result indicating the own position identified by the position server from the position server Communication means for performing the communication, and output means for outputting the specified result received from the position server by the communication means to the navigation device; Reception operation and the GP of the base station signal by the base station signal receiving means when the Shon device is in a non-operating state
The S satellite signal receiving means is caused to perform a GPS satellite signal receiving operation, and the measurement result of the base station signal and the measurement result of the GPS satellite signal are transmitted from the communication means to the position server, and are received from the position server by the communication means. Control means for outputting a specified result from the output means to a navigation device. 2. The mobile communication terminal according to claim 1, wherein the control unit integrates a measurement result of the base station signal when the mobile communication terminal is stopped, and measures the integrated base station signal. A mobile communication terminal for transmitting a result from the communication means to a location server. 3. The mobile communication terminal according to claim 1, wherein the control unit integrates the specific result received by the communication unit from a position server, and transmits the integrated specific result from the output unit to the navigation device. A mobile communication terminal characterized by outputting. 4. The mobile communication terminal according to claim 1, wherein the control unit determines whether the search for the GPS satellite has succeeded or failed, and determines that the search for the GPS satellite has failed. When the determination is made, the base station signal receiving means is caused to perform a base station signal receiving operation, and when it is determined that the search for the GPS satellite is successful, the GP satellite signal receiving means
A mobile communication terminal for receiving an S satellite signal. 5. The mobile communication terminal according to claim 1, wherein the mobile communication terminal is in an operating state when the vehicle is in a running state and is in a non-operating state when the vehicle is in a stopped state. A mobile communication terminal used with a car navigation device according to the present invention. 6. A mobile communication terminal according to claim 1, wherein the navigation device is configured to be able to specify a position independently and processes a specification result input from the mobile communication terminal as an initial position at the time of activation. A navigation system comprising a device. 7. The navigation system according to claim 6, wherein the navigation device processes the specifying result input from the mobile communication terminal as an initial position at the time of activation, and then specifies the position by itself. Navigation system. 8. A position specifying device comprising a position server configured to specify a position of the mobile communication terminal based on a measurement result of a base station signal or a measurement result of a GPS satellite signal received from the mobile communication terminal. A mobile communication terminal that is used in the system and is configured to be able to specify a position by itself and used in a mobile communication terminal. For transmitting the GPS satellite signal, transmitting the measurement result of the base station signal and the measurement result of the GPS satellite signal to the position server, and outputting the specific result received from the position server to the navigation device. And a computer program to execute.