JP2014142185A - On-board device, terminal unit and navigation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a navigation system capable of stably displaying position and azimuth even in stoppage without depending on the type of navigation application used on a portable apparatus.SOLUTION: An on-board device 10 comprises: an on-board GPS receiver 11; a status determination section 16 that determines the status of a vehicle; and a storage 13 storing GPS data. When the vehicle is determined as in travelling, the on-board device 10 stores the GPS data in the storage. When the vehicle is determined to make a stoppage, the on-board device 10 acquires position and azimuth of the vehicle based on the storage immediately before the stoppage. By constantly transmitting identical information on the position and azimuth while the vehicle is in the stoppage to a navigation application section 24 of the terminal unit 20, even when the vehicle is in the stoppage, the position and azimuth can be stably displayed without depending on the processing of a navigation application of a terminal unit 20.

Description

  The present invention relates to a navigation system including an in-vehicle device mounted on a vehicle and a terminal device carried by a user.

  As a conventional navigation system, one using a navigation application using a GPS receiver mounted on a portable terminal device typified by a smartphone is known. In general, position and speed information from a GPS receiver mounted on a terminal is displayed on a map acquired via a network. In addition, there are various types of navigation apps, and users can freely install and use them. In relation to a conventional navigation system, a positioning system and an in-vehicle device are disclosed that improve the positioning accuracy when the vehicle is running by using the positioning result by the in-vehicle GPS positioning function and the positioning result by the portable GPS positioning function ( For example, see Patent Document 1).

JP 2009-122079 A

  However, the conventional navigation device has a problem that the orientation displayed on the navigation device is not stable due to the principle that the GPS orientation cannot be calculated when the vehicle is stopped.

  The present invention has been made to solve the conventional problems, and an object of the present invention is to provide a navigation system, an in-vehicle device, and a terminal device that can stabilize the orientation on the display when the vehicle is stopped.

  To achieve the above object, the present invention comprises an in-vehicle device mounted on a vehicle and a terminal device that performs data communication with the in-vehicle device, and the in-vehicle device receives information from a GPS satellite. And an in-vehicle GPS receiver that calculates GPS data that is information indicating its own position and direction, and the terminal device receives information from a GPS satellite and calculates GPS data that is information indicating its own position and direction. A terminal GPS receiver, and a display unit that displays a current position based on GPS data. The terminal device is acquired by the in-vehicle GPS receiver when the in-vehicle device and the terminal device are in communication. The current position is displayed based on the GPS data.

  According to the present invention, it is possible to display a stable azimuth and position even when the GPS azimuth accuracy and position accuracy deteriorate due to the stop.

The block diagram of the navigation apparatus in Embodiment 1 of this invention. It is explanatory drawing of the vehicle-mounted GPS management part in Embodiment 1 of this invention, Comprising: (a) is a figure which shows the flow of data when the vehicle is drive | working, (b) is a case where the vehicle has stopped. Diagram showing data flow Flow chart for explaining the operation of the navigation device according to the first embodiment of the present invention. Flow chart for explaining the operation of the navigation device according to the second embodiment of the present invention.

(Embodiment 1)
Hereinafter, a navigation system according to Embodiment 1 of the present invention will be described with reference to the drawings.

  FIG. 1 is a configuration diagram of a navigation system 1 according to Embodiment 1 of the present invention. In FIG. 1, a navigation system 1 includes an in-vehicle device 10 mounted on a vehicle and a terminal device 20 carried and used by a user. Each of these two devices is a signal from a GPS (Global Positioning System) satellite. Is used to process GPS data including information such as position, speed, direction, date and time.

  The in-vehicle device 10 stores the in-vehicle GPS receiver 11, the in-vehicle GPS management unit 12 that manages the position data output from the in-vehicle GPS receiver 11, and the data output from the past in-vehicle GPS receiver 11. A storage area 13 managed by the unit 12, an in-vehicle communication management unit 14 for sending GPS data to the terminal device 20, a vehicle speed pulse detection unit 15 for detecting rotation of wheels of the vehicle, and movement and stop of the vehicle. It has the state determination part 16 to determine.

  Further, the terminal device 20 is acquired from the terminal GPS receiver 21, the terminal communication management unit 23 that receives GPS data transmitted from the in-vehicle device 10, and the GPS data and terminal communication management unit 23 that are transmitted from the terminal GPS receiver 21. A terminal communication management unit 23 that manages which GPS data to use, and a navigation application unit that searches for and guides a destination from specifying the current position using GPS data sent from the terminal GPS management unit 22 24 and a display unit 25 for displaying the contents of the navigation application unit 24. However, the display unit 25 does not have to be provided integrally with the terminal device 20.

  The processing operation of the navigation device configured as described above will be described below.

  The vehicle-mounted GPS receiver 11 mounted on the vehicle-mounted device 10 and the terminal GPS receiver 21 mounted on the terminal device 20 receive a signal sent from a GPS satellite and determine the position and speed.

  In both GPS receivers, in order to calculate the current position, first, the satellite position of the GPS satellite is calculated from the orbit information sent from the GPS satellite.

  Next, calculate the propagation distance from the GPS satellite to the GPS receiver, consider the equation of a sphere with the propagation distance as the radius around the position of the GPS satellite, determine the same equation for multiple GPS satellites, The current position is determined by solving the simultaneous equations.

  In order to calculate the speed of the GPS receiver, the GPS receiver first calculates the speed of the GPS satellite from the orbit information sent from the satellite.

Next, the Doppler shift frequency is obtained from the frequency component included in the carrier frequency detected by the GPS receiver, and the relative velocity between the GPS satellite and the GPS receiver is calculated. By subtracting the moving speed of the satellite from the calculated relative speed between the GPS satellite and the receiver, the speed of the GPS receiver in each GPS satellite direction can be calculated. The speed of the GPS receiver can be determined by obtaining a relational expression indicating this speed for a plurality of GPS satellites with the speed in each coordinate direction as an unknown and solving the simultaneous equations. In addition, the absolute direction of the GPS receiver can be obtained using the velocity component in each coordinate direction of the calculated velocity.

  However, in other words, since the absolute azimuth is obtained by using the velocity component in each coordinate direction, the information on the absolute azimuth becomes unstable when the vehicle is stopped (when stopped).

  The terminal device 20 calculates the position, velocity, and direction of the GPS receiver by the terminal GPS receiver 21 as described above, and sends the result to the terminal GPS management unit 22.

  As a general operation, by sending the acquired GPS data to the navigation application unit 24, the navigation application unit 24 can correctly display the position and orientation.

  On the other hand, when the terminal device 20 is brought into the vehicle, the in-vehicle device 10 and the terminal communication management unit 23 can communicate with each other.

  The in-vehicle communication management unit 14 and the terminal communication management unit 23 simply establish communication between the in-vehicle device 10 and the terminal device 20, and may be based on, for example, a Bluetooth (registered trademark) communication standard or a wireless LAN. Or communication by wired connection.

  Note that the in-vehicle GPS management unit 12 and the terminal GPS management unit 22 sequentially detect whether communication is established between the in-vehicle device 10 and the terminal device 20.

  The in-vehicle communication management unit 14 and the terminal communication management unit 23 exchange various information of the in-vehicle device 10 and the terminal device 20, and the GPS data of the in-vehicle GPS receiver 11 is included as one piece of information. .

  By the way, the in-vehicle GPS receiver 11 and the terminal GPS receiver 21 basically receive signals from GPS satellites and have the same functions for calculating position, velocity, and direction, but there are differences in their characteristics.

  For example, the in-vehicle GPS receiver 11 is assumed to travel on an outdoor road, and the antenna is also expected to be installed in an optimal place to some extent, so that not much reception sensitivity is required.

  However, when installed in the terminal device 20, the reception environment in a building or the like may be bad, and a small chip antenna is also used as the antenna. In many cases, the sensitivity is set relatively high.

  In general, in order to change the sensitivity of a GPS receiver, a technique such as increasing the integration time of a correlator that is a part of an internal circuit is used. However, if the integration time is lengthened to improve the sensitivity, problems such as a slow satellite scanning time and a strong influence of reflected waves also occur.

  For this reason, the GPS receiver for in-vehicle devices and the GPS receiver for terminal devices generally have different performance in consideration of the characteristics of the application.

Therefore, when comparing the two in terms of “sensitivity”, the GPS receiver for in-vehicle use has the advantage that it can shorten the satellite scanning time and is less susceptible to the reflected wave than the GPS receiver for terminal equipment use. .

  In addition, both GPS receivers require power supply, but terminal devices that are carried (carried) by users are generally only equipped with small rechargeable batteries. There is a need to reduce. Therefore, a GPS receiver for terminal devices has a feature that the number of positioning processes per unit time must be reduced.

  On the other hand, in-vehicle use GPS receivers generally have an on-board battery as the power supply, and can be connected to a relatively large capacity power supply compared to GPS receivers for terminal use, and positioning processing per unit time It is also easier to increase the number of times compared to the terminal use.

  Therefore, when comparing the two in terms of positioning accuracy per unit time, the GPS receiver for in-vehicle use can perform positioning more frequently than the GPS receiver for terminal device use, so that the accuracy is also improved. There is a point.

  When the terminal device 20 is mounted on a vehicle and used, it is considered that the terminal device 20 is used for in-vehicle use. Therefore, the navigation application unit 24 uses GPS data output from the in-vehicle GPS receiver 11 mounted on the in-vehicle device 10. Doing so would improve the basic performance.

  Therefore, in the present embodiment, when the terminal GPS management unit 22 can determine that the terminal device 20 is brought into the vehicle, communication with the in-vehicle device 10 is established, and GPS data is acquired from the in-vehicle device 10. Instead of the GPS data acquired by the terminal GPS receiver 21, the GPS data acquired by the in-vehicle GPS receiver 11 is used as input data of the navigation application unit 24.

  The navigation application unit 24 is an application that performs search and search for a destination, guidance to a destination, and the like from display of the current position on a map. In the terminal device 20 typified by a smartphone, a user can freely install and use various navigation apps, and the present invention does not assume a specific navigation app.

  A general navigation application operates using GPS data of the terminal GPS receiver 21 mounted on the terminal device 20 as an input.

  In the present invention, as described above, when connected to the in-vehicle device 10, the terminal GPS management unit 22 receives the GPS data of the in-vehicle GPS receiver 11 and inputs it to the navigation application unit 24.

  The navigation application unit 24 to be used is assumed to be various types of applications, such as those that are assumed to be used on foot or those that are assumed to be used on bicycles or automobiles.

  For example, when assumed to be used in an automobile, it is assumed that the vehicle passes on a road, and therefore, a map matching technique that matches the position of the vehicle with road data is generally used. With such a technique, for example, even when some error occurs in GPS data, it is possible to suppress the influence on the display.

  However, since the user does not always use the navigation application of the terminal device 20 in the in-vehicle device 10, the influence of the error due to the map matching is not necessarily reduced.

  If the navigation application is supposed to be used on foot or by bicycle, the terminal device 20 may exist on a road other than the road, and a map matching technique similar to that for in-vehicle applications should be used. It is difficult to suppress the influence of GPS data errors.

  Furthermore, considering the use with the in-vehicle device 10, it is assumed that the user is driving, and it is difficult to watch the display for safety reasons, in order to improve the visibility. However, the stability of the displayed vehicle position and direction is very important.

  The present invention improves the accuracy of the navigation application unit 24 when the usage situation in such an in-vehicle environment is assumed, especially when the direction and position accuracy of GPS data sent from the GPS receiver deteriorates. Next, the operation of the in-vehicle device 10 will be described in detail.

  The in-vehicle device 10 is equipped with an in-vehicle GPS receiver 11 that acquires position and orientation information (GPS data) by receiving a signal from a GPS satellite, and the GPS data from the in-vehicle GPS receiver 11 is It is acquired by the in-vehicle GPS management unit 12.

  The vehicle speed pulse detection unit 15 generally detects pulse information generated by detecting rotation of the vehicle axle. When the vehicle is stopped, no pulse is generated, and the vehicle speed pulse detection unit 15 is proportional to the moving speed. The pulse generation cycle is shortened.

  The state determination unit 16 constantly monitors the output of the vehicle speed pulse detection unit 15 and determines whether the vehicle is stopped or moving.

  In addition, parking brake information is assumed as vehicle information that can be used in the determination by the state determination unit 16. When the parking brake is effective, it is considered that the vehicle is stopped. Therefore, when the parking brake is effective, it may be determined that the vehicle is stopped.

  The in-vehicle GPS management unit 12 receives a determination result indicating that the vehicle is moving or stopped from the state determination unit 16, and processing when GPS data is acquired from the in-vehicle GPS receiver 11 varies depending on the state.

  When the in-vehicle device 10 has a map matching function, road data (map data) is stored in the storage area 13, and the stored map information and information obtained from the vehicle speed pulse detection unit 15 are stored. The in-vehicle GPS management unit 12 performs necessary calculation processing.

  FIG. 2 is a diagram for explaining an overview of processing executed by the in-vehicle GPS management unit 12 in the present embodiment.

  If it is determined that the vehicle is moving, the GPS data output from the in-vehicle GPS receiver 11 is sent to the in-vehicle communication management unit 14 and stored in the storage area 13 (FIG. 2A). As described above, it is assumed that the azimuth and position accuracy output by the in-vehicle GPS receiver 11 is better than the terminal GPS receiver 21.

  Naturally, absolute azimuth accuracy and position accuracy are affected by surrounding buildings, etc., but in the same reception environment, accuracy is better when moving and when stopping and moving. Conceivable.

Further, GPS information from the in-vehicle GPS receiver 11 at the time of movement is always stored in the storage area 13, so that when the vehicle is stopped, GPS data such as the position and direction immediately before stopping is recorded.

  If it is determined that the vehicle is stopped, the GPS information immediately before stopping is read from the storage area 13 and the GPS information related to the position and direction is acquired.

Next, the contents related to the position and orientation of the GPS data acquired from the in-vehicle GPS receiver 11 are replaced with the past position and orientation read from the storage area 13 (FIG. 2B).
Furthermore, since the vehicle is stopped, the content related to the speed can be replaced with “0”. However, contents other than the position, speed, and direction are not changed.

  As described above, the navigation system 1 according to the present embodiment transmits data in which the content of the GPS data is replaced to the terminal device 20 via the in-vehicle communication management unit 14.

  As described above, in the terminal device 20, when the terminal communication management unit 23 can communicate with the in-vehicle device 10, the terminal GPS management unit 22 inputs the GPS data acquired from the in-vehicle device 10 to the navigation application unit 24.

  That is, when it is determined that the vehicle-mounted device 10 is stopped, the same information of the position and direction immediately before stopping stored in the storage area 13 is continuously input to the navigation application unit 24 as GPS data. As a result, the navigation application unit 24 acquires GPS data of the same direction and position while the vehicle is stopped, and the direction of the host vehicle displayed on the display unit 25 without depending on the processing content of the navigation application unit 24. The position information is based on the information processed by the in-vehicle device 10 and becomes stable.

  When the vehicle starts to move, GPS data output from the in-vehicle GPS receiver 11 is input to the navigation application unit 24, and the navigation application unit 24 updates the display of the vehicle position using the data. It will be.

  By adopting such a configuration, when it is determined that the vehicle is stopped, even if the accuracy of the azimuth and position of the in-vehicle GPS receiver 11 deteriorates, the same azimuth and current position immediately before stopping are continuously connected to the terminal. Since it is sent to the device 20, it is expected that a stable vehicle position and direction are determined even when the vehicle is stopped without depending on the navigation application unit 24 of the terminal device 20.

  FIG. 3 is a flowchart of the in-vehicle GPS management unit 12 in the in-vehicle device 10 according to Embodiment 1 of the present invention.

The in-vehicle GPS management unit 12 acquires GPS data from the in-vehicle GPS receiver 11 (S101). GPS data generally includes information such as position, speed, direction, date and time, and a typical example of the format is a text format called NMEA (National Marine Electronics Association) -0183. is there.
NMEA-0183 is generally used as the GPS data input format of the navigation application unit 24.

Next, the in-vehicle GPS management unit 12 acquires whether the vehicle is moving or stopped as a state determination result from the state determination unit 16 (S102). Since the subsequent processing is different between moving and stopping, it is determined whether the vehicle is moving or stopped (S103).
When it determines with moving (S103, Yes), the GPS data acquired by S101 are preserve | saved at the storage area 13. FIG.

At this time, only the azimuth and position data to be used may be stored from the acquired GPS data, or for example, all GPS data as indicated by NMEA-0183 described above may be stored. . Since only the latest data is required, the storage area 13 may be overwritten in the same area.

  When it determines with stopping (S103, No), the GPS information preserve | saved from the storage area 13 is read (S105). The data to be read is information regarding the position and direction, and is data stored immediately before stopping.

  Next, the area where the position and direction of the GPS data acquired from the in-vehicle GPS receiver 11 is stored is updated with the position and direction data stored in the storage area 13 read out in S105, and new GPS data is created. (S106).

  Whether traveling or stopping, the GPS data is finally sent to the in-vehicle communication management unit 14 and sent to the terminal device 20 (S107).

  Next, the processing procedure of the terminal GPS management unit 22 will be described. The terminal GPS management unit 22 constantly monitors whether communication with the in-vehicle device 10 is connected (S201).

  When the in-vehicle device 10 and the terminal device 20 are connected (S201, Yes), GPS data is acquired from the in-vehicle device 10 via the terminal communication management unit 23 (S202).

The GPS data acquired in step S202 is sent to the navigation application unit 24 as it is, and the navigation application unit 24 operates using the in-vehicle GPS data (S203).
When the in-vehicle device 10 and the terminal device 20 are not connected (S201, No), GPS data is acquired from the terminal GPS receiver 21 (S204).

  The GPS data acquired from the terminal GPS receiver 21 is sent to the navigation application unit 24 as it is, and the navigation application unit 24 operates using the terminal GPS data (S205).

  By performing such processing, when the terminal device 20 is brought into the vehicle and connected to the in-vehicle device 10, the GPS data mounted in the in-vehicle device 10 is used.

  Furthermore, when it is determined that the vehicle is stopped, the same GPS data is sent, and even if the position and direction at the time of stopping are unstable as a characteristic of the GPS receiver. A stable position can be displayed on the display unit 25.

(Embodiment 2)
Hereinafter, a navigation apparatus according to Embodiment 2 of the present invention will be described with reference to the drawings. The basic configuration is the same as (Embodiment 1), and description thereof is omitted.

  In order for the in-vehicle GPS receiver 11 mounted on the in-vehicle apparatus 10 to calculate the position, velocity, and direction, as described above, the accurate position of the satellite is established in order to establish a simultaneous equation of the sphere centered on the position of the satellite. Need to be calculated.

  In order to calculate the exact position of the satellite, it is necessary to receive a signal from the satellite and acquire detailed orbit information (Ephemeris). In order to acquire detailed orbit information, it is necessary to receive a signal from a satellite continuously for about 30 seconds in an environment with a good view.

The acquired detailed trajectory information has an expiration date and is generally invalidated in 2 to 4 hours. Therefore, when the parking lot is stopped for a long time, the detailed trajectory information becomes invalid, and it is necessary to reacquire the detailed trajectory information by receiving the satellite again immediately after the power is turned on.
Therefore, there is a possibility that effective GPS data cannot be calculated by the in-vehicle GPS receiver 11 from the time the power is turned on until the detailed orbit information is reacquired.

  The navigation application unit 24 of the terminal device 20 requires valid GPS data, and since the current position cannot be specified until the valid position is detected by the in-vehicle GPS receiver 11, the route to the destination Searching is also difficult.

  Even when positioning cannot be performed immediately after power-on of the in-vehicle device 10 as described above, when it can be determined that the vehicle is stopped, the GPS data stored in the storage area 13 is updated as the latest GPS data as more effective GPS data. The navigation application unit 24 of the terminal device 20 can identify the current position by replacing the data with the terminal device 20.

  FIG. 4 is a flowchart in processing of the in-vehicle GPS management unit 12 mounted on the in-vehicle device 10 in the second embodiment.

  GPS data is acquired from the in-vehicle GPS receiver 11 (S301), the state of the vehicle being moved or stopped is acquired from the state determination unit 16 (S303), and when moving (S303, Yes), to the storage area 13 The process of storing GPS information is the same as that in the first embodiment.

  In the case of stopping (S303, No), the GPS information immediately before stopping is read from the storage area (S305), and the GPS data acquired from the in-vehicle GPS receiver 11 is updated with the GPS information (S306) as in the first embodiment. It will be the same.

  When the GPS data acquired from the in-vehicle GPS receiver 11 cannot perform positioning calculation such as immediately after the power is turned on (S307, Yes), the area indicating the positioning validity is changed to positioning valid (S308).

  As a result, it is possible to display the position and direction even immediately after power-on by using the position and direction data updated from the GPS data as being determined as valid data by the navigation application unit 24. is there.

  As described above, the navigation system of the present invention has a configuration in which data managing the contents of GPS data output from a GPS receiver is passed to a navigation application of a terminal device using vehicle information such as vehicle speed pulses.

  In particular, when it is determined that the in-vehicle device is stopped in the state determination unit, the in-vehicle GPS management unit reads out the past GPS position and orientation information read from the storage area and obtains it from the in-vehicle GPS receiver. The GPS data obtained by replacing the position and orientation of the GPS data is sent as GPS data to the terminal device via the in-vehicle communication management unit. In the terminal device, the terminal GPS management unit transmits the GPS data acquired from the terminal communication management unit to the terminal GPS. Instead of the GPS data from the receiver, the navigation application unit is used as input.

  As a result, it is possible to eliminate the inconvenience that the position displayed in the navigation system is not stable due to the fact that the accuracy is easily deteriorated because the signal is easily influenced by reflection of signals from surrounding buildings or the like when the vehicle is stopped.

In the prior art, when the vehicle is stopped, the direction information output by the GPS satellite is information indicating various values from 0 to 360 degrees. When displayed on the map, the azimuth direction different from the original traveling direction is displayed randomly, or the position calculated by the GPS receiver has an error due to the influence of surrounding buildings, etc., so the vehicle stops. Despite being displayed, the vehicle position has been displayed as moving within a certain range, but these can be prevented by the above-described configuration.

  The navigation device of the present invention improves the stability of the position and direction when the vehicle is stopped, and is useful as a navigation device.

DESCRIPTION OF SYMBOLS 1 Navigation system 10 In-vehicle apparatus 11 In-vehicle GPS receiver 12 In-vehicle GPS management part 13 Storage area 14 In-vehicle communication management part 15 Vehicle speed pulse detection part 16 State determination part 20 Terminal device 21 Terminal GPS receiver 22 Terminal GPS management part 23 Terminal communication management Section 24 Navigation application section 25 Display section

Claims (9)

An in-vehicle device that is mounted on a vehicle and performs data communication between the terminal device carried by the user and the own device,
An in-vehicle GPS receiver that receives information from a GPS satellite and calculates GPS data that is information indicating its own position and direction,
An in-vehicle device that transmits GPS data acquired by the in-vehicle GPS receiver to the terminal device when the in-vehicle device and the terminal device are communicating. An in-vehicle GPS management unit that manages GPS data calculated by the in-vehicle GPS receiver; and an in-vehicle communication management unit that transmits the GPS data to the terminal device;
The in-vehicle GPS management unit transmits the GPS data acquired by the in-vehicle GPS receiver to the terminal device when the in-vehicle communication management unit detects that communication is established with the terminal device. The in-vehicle device according to claim 1. A state determination unit for determining whether the vehicle is moving or stopped, and a storage area for storing GPS data output from the in-vehicle GPS receiver,
The in-vehicle GPS management unit stores GPS data output from the in-vehicle GPS receiver in the storage area when the state determination unit determines that the vehicle is moving, and the state determination unit The in-vehicle device according to claim 2, wherein when it is determined that the vehicle is stopped, GPS data stored in the storage area is transmitted to the terminal device.   The in-vehicle GPS management unit changes the GPS data from invalid to valid when the GPS data sent from the in-vehicle GPS receiver to the in-vehicle GPS management unit is invalid immediately after the on-vehicle device is turned on. The in-vehicle device described. A terminal device that performs data communication between an in-vehicle device equipped with an in-vehicle GPS receiver that is installed in a vehicle and calculates GPS data, and the device itself,
A terminal device that displays its own position and direction based on the GPS data acquired by the vehicle-mounted GPS receiver when the vehicle-mounted device and the terminal device are communicating. A terminal communication management unit that receives GPS data transmitted from the in-vehicle device, a terminal GPS management unit that manages GPS data received by the terminal communication management unit, and the GPS data received from the terminal GPS management unit A navigation application unit that performs processing for specifying a position; and a display unit that displays a result of processing performed by the navigation application unit.
The terminal GPS management unit transmits the GPS data acquired by the in-vehicle GPS receiver to the navigation application unit when the terminal communication management unit detects that communication is established with the in-vehicle device. The terminal device according to claim 5, wherein a processing result performed by the navigation application unit is displayed on the display unit. A navigation system comprising an in-vehicle device mounted on a vehicle and a terminal device that performs data communication with the in-vehicle device,
The in-vehicle device includes an in-vehicle GPS receiver that receives information from a GPS satellite and calculates GPS data that is information indicating its own position and direction,
The terminal device includes a terminal GPS receiver that receives information from a GPS satellite and calculates GPS data, which is information indicating its own position and direction, and a display unit that displays a current position based on the GPS data,
The said terminal device is a navigation system which displays a present position based on GPS data acquired with the said vehicle-mounted GPS receiver, when the said vehicle-mounted device and the said terminal device are communicating. The in-vehicle device includes an in-vehicle GPS management unit that manages GPS data calculated by the in-vehicle GPS receiver, and an in-vehicle communication management unit that transmits the GPS data to the terminal device.
The terminal device includes a terminal communication management unit that receives GPS data transmitted from the in-vehicle device, a terminal GPS management unit that manages GPS data received by the terminal communication management unit, and the GPS from the terminal GPS management unit. A navigation application unit that receives data and identifies a current position; and a display unit that displays a result of processing performed by the navigation application unit,
The terminal GPS management unit transmits the GPS data acquired by the in-vehicle GPS receiver to the navigation application unit when the terminal communication management unit detects that communication is established with the in-vehicle device. The navigation system according to claim 7, wherein a processing result performed by the navigation application unit is displayed on the display unit. The in-vehicle device includes a state determination unit that determines whether the vehicle is moving or stopped, and a storage area that stores GPS data output from the in-vehicle GPS receiver,
The in-vehicle GPS management unit stores GPS data output from the in-vehicle GPS receiver in the storage area when the state determination unit determines that the vehicle is moving, and the state determination unit The navigation system according to claim 8, wherein if it is determined that the vehicle is stopped, GPS data stored in the storage area is transmitted to the terminal device.