JP2003232638A - Navigation device, its system and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a navigation device capable of simply updating navigation screen display data for displaying bird's eye view or the like with no burden to a user. <P>SOLUTION: Broadcasted 3D modeling data and characteristic data PRD are received with an antenna 31. A CPU 44 rewrites or adds an HDD 37 by the received 3D modeling data, erases the 3D modeling data, or produces or updates link data to map data, and stores the received characteristic data PRD so as to correspond to the 3D modeling data. The CPU 44 reads out the 3D modeling data corresponding to a position detected with a GPS processing part 34 from the HDD 37 and processes for displaying. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a navigation device, a navigation system and a method thereof which can easily update navigation screen display data for displaying a bird's-eye view or the like without burdening the user.

[0002]

2. Description of the Related Art A GPS (Global Positioning System) is a positioning system for detecting the position of a moving body such as an automobile by using radio waves transmitted from a plurality of GSP artificial satellites to the ground when the moving body moves.
Car navigation systems that use the Positioning System) have become widespread. In such a car navigation device, on the map data provided by being recorded in a CD-ROM (Compact Disc Read Only Memory) or a DVD (Digital Versatile Disk) based on the data acquired from the GPS and the motion sensor. The position and traveling direction of the moving body are specified, and screen display is performed according to the traveling direction of the moving body. There are various kinds of screen displays as described above. For example, in addition to the one displayed on a two-dimensional plane looking down from above,
There is a bird's-eye view (bird's-eye view) that displays a three-dimensional view of the traveling direction from the viewpoint of a bird flying in the sky. Compared to the two-dimensional representation, the bird view makes it easier for the driver to grasp a concrete image of a building or the like as a landmark, and can support driving with less stress than judgment from the two-dimensional map screen.

[0003]

However, the image of a building such as a building often changes due to rebuilding, demolishing, etc., and the 3D (3D) modeling data for bird view display stored in the car navigation device is often used. Since updating takes time, the bird's-eye view display may differ from the actual landscape. In this case, if the bird's-eye view screen is partly different because it is almost the same as the actual scenery, there is a problem that the driver is likely to make a mistake in the road. It is necessary for the user himself to purchase a new CD-ROM or DVD disc to update or upgrade these map data, which causes a problem that the burden on the user is heavy.

The present invention has been made in view of the above-mentioned prior art, and provides a navigation device, a navigation system and a method thereof which can easily update the navigation screen display data for displaying a bird's view etc. without burdening the user. The purpose is to provide.

[0005]

In order to solve the above-mentioned problems of the prior art and achieve the above-mentioned object, the navigation device of the first invention is a navigation device mounted on a moving body, First receiving means for receiving digitally broadcasted navigation screen display data and characteristic data, second receiving means for receiving position detecting data, and the moving body based on the received position detecting data. Of the navigation screen display data stored in the storage means based on the received navigation screen display data, based on the received characteristic data. Rewriting or addition, deletion of the stored navigation screen display data, or navigation screen display data Link data is generated or updated, the characteristic data is stored in the storage means in association with the navigation screen display data, and the navigation screen display data corresponding to the detected position of the moving body is stored in the storage means. And a control unit that performs a process of reading and displaying.

The operation of the navigation device of the first invention is as follows. The first receiving means receives the navigation screen display data and the characteristic data which are digitally broadcast. Then, based on the received characteristic data, the control means rewrites or adds the navigation screen display data stored in the storage means by the received navigation screen display data, erases the stored navigation screen display data, or Link data to the navigation screen display data is generated or updated. Further, the control unit stores the received characteristic data in the storage unit in association with the navigation screen display data. Further, the second receiving means receives the position detection data. Then, the position detection means detects the position of the moving body based on the received position detection data. And
The control means reads the navigation screen display data corresponding to the detected position of the moving body from the storage means, and a process of displaying the read navigation screen display data is performed.

In the navigation device of the first invention, preferably, the first receiving means receives the navigation screen display data for performing a bird's-eye view display of a landscape or an object, and the control means comprises: Bird view display is performed using the navigation screen display data corresponding to the detected position of the moving body. Further, in the navigation device of the first invention, preferably, the first receiving means receives the characteristic data including position data corresponding to the digitally broadcast navigation screen display data, and the control means, Rewriting or addition of the navigation screen display data stored in the storage means by the received navigation screen display data based on the characteristic data and the detected position of the moving body,
Erase the stored navigation screen display data,
Alternatively, the link data to the navigation screen display data is generated or updated.

Further, in the navigation apparatus of the first invention, preferably, the first receiving means receives the characteristic data including at least update date data or version data of the digitally broadcast navigation screen display data. The control means compares the update date data or the version data included in the received characteristic data with the update date data or version data corresponding to the navigation screen display data already stored in the storage means. When the received navigation screen display data is newer, rewriting or addition of the navigation screen display data stored in the storage means by the received navigation screen display data, deletion of the stored navigation screen display data, Or navigator For generating or updating of the link data to the ® down screen display data.

Further, in the navigation apparatus of the first invention, preferably, the first receiving means receives the characteristic data indicating an expiration date of the digitally broadcast navigation screen display data, and the control means. Of the navigation screen display data stored in the storage means, the navigation screen display data that has passed the expiration date is deleted based on the characteristic data. Further, in the navigation device of the first invention, preferably, the first receiving means receives the characteristic data indicating a priority of the digitally broadcasted navigation screen display data,
The control means preferentially erases the navigation screen display data having a low priority among the navigation screen display data stored in the storage means, based on the characteristic data, as necessary.

Further, in the navigation device of the first invention, preferably, the storage means corresponds to a position outside a predetermined range from the detected position in the navigation screen display data stored in the storage means. Lower the priority indicated by the characteristic data of the navigation screen display data. Further, the navigation device of the first invention is
Preferably, the first receiving means receives the characteristic data including at least attribute data indicating an attribute of a landscape or an object displayed in the navigation screen display data, and the landscape or the landscape data based on the navigation screen display data. When the landscape or the object is designated while the object is displayed, the attribute data corresponding to the designated landscape or the object is displayed.

In the navigation apparatus of the first invention, the storage means stores map data, and the control means generates link data indicating a link between the received navigation screen display data and the map data. Then
The link data is written in the storage means. Further, in the navigation apparatus of the first invention, preferably, the control means uses the link data corresponding to the detected position of the moving body on a map defined by map data, to display the navigation screen. Display data is specified, and the specified navigation screen display data is read from the storage means and displayed.

The navigation system of the second invention is a navigation system having a transmitter for broadcasting navigation screen display data and characteristic data, and a navigation device mounted on a moving body, wherein the navigation device is A first receiving means for receiving the navigation screen display data and the characteristic data which are digitally broadcast, and a second receiving means for receiving the position detecting data.
Receiving means, position detecting means for detecting the position of the moving body based on the received position detection data, storage means for storing navigation screen display data, and based on the received characteristic data, Rewriting or adding the navigation screen display data stored in the storage means by the received navigation screen display data, deleting the stored navigation screen display data, or generating or updating the link data to the navigation screen display data, Control means for storing the characteristic data in the storage means in association with the navigation screen display data, and for reading the navigation screen display data corresponding to the detected position of the moving body from the storage means and displaying the navigation screen display data; Have. In the operation of the navigation system of the second invention, the transmitting device broadcasts the navigation screen display data and the characteristic data. Then, the navigation device performs the same operation as the above-described first invention.

The navigation method of the third invention is a navigation method carried out by a navigation device mounted on a moving body, which comprises a step of receiving digital broadcast navigation screen display data and characteristic data, and position detection. Navigation data, the step of detecting the position of the moving body based on the received position detection data, and the navigation device based on the received navigation screen display data based on the received characteristic data Rewriting or adding the navigation screen display data stored in the storage means, deleting the stored navigation screen display data, or generating or updating the link data to the navigation screen display data; Corresponding to the navigation screen display data before And a step of storing in the storage means, and a step of a navigation screen display data performs processing for displaying read from said memory means corresponding to the position of the detected moving object. In the navigation method of the third invention, the navigation device receives the navigation screen display data and the characteristic data which are digitally broadcast. Next, when the navigation device performs an update operation, based on the received characteristic data, rewriting or addition of the navigation screen display data stored in the storage means by the received navigation screen display data, the stored data. Delete the navigation screen display data, or generate or update the link data to the navigation screen display data. In parallel with the processing described above, the navigation device receives the position detection data. Next, the navigation device detects the position of the moving body based on the received position detection data. Next, when the navigation device performs position display, it performs a process of reading out navigation screen display data corresponding to the detected position of the moving body from the storage means and displaying it.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION A car navigation system according to an embodiment of the present invention will be described below. Figure 1
FIG. 1 is an overall configuration diagram of a car navigation system 1 of this embodiment. As shown in FIG. 1, the car navigation system 1 includes, for example, a broadcasting device 2, a broadcasting antenna 3, a broadcasting artificial satellite 4, a broadcasting base station 5, a navigation device 6 mounted on a vehicle 7, and a GPS 8.
The broadcasting device 2 corresponds to the transmitting device of the present invention, the vehicle 7 corresponds to the moving body of the present invention, and the navigation device 6 corresponds to the navigation device of the present invention.

The outline of the operation of the car navigation system 1 shown in FIG. 1 will be described below. FIG. 2 is a flowchart for explaining an outline of operation of the car navigation system 1 shown in FIG. Step ST1: The broadcasting device 2 broadcasts the 3D modeling data (3DMD) which is the navigation screen display data and the characteristic data PRD indicating the characteristic from the broadcasting antenna 3 through the broadcasting artificial satellite 4. The broadcasting device 2 may broadcast the 3D modeling data to the navigation device 6 via the terrestrial broadcasting base station 5. The 3D modeling data is, for example, data obtained by 3D modeling a building or a landscape for displaying a bird's-eye view of a map by car navigation. The 3D modeling data is, for example,
It is composed of individual buildings and the entire landscape seen from a predetermined position. The characteristic data includes, for example, position data (display position) of corresponding navigation screen display data, expiration date data, update date data, version data, and attribute data indicating attributes of a landscape or an object displayed in the navigation screen display data. Including. Here, the 3D modeling data corresponds to the navigation screen display data of the present invention, and the characteristic data PRD corresponds to the characteristic data of the present invention.

Step ST2: 3D modeling data 3DMD and characteristic data P broadcast in step ST1
The RD is received by the navigation device 6.

Step ST3: Navigation device 6
Based on the 3D modeling data and the characteristic data received in step ST2, using the received 3D modeling data, rewriting or erasing the 3D modeling data stored in the memory, adding 3D modeling data, or 3D modeling data Generates or updates the link data to. Further, the received characteristic data is stored in the memory in association with the 3D modeling data.

Step ST4: Navigation device 6
However, according to the movement of the vehicle 7, the positioning radio wave from the GPS 8 is received to detect its own position, and the bird view display is performed using the navigation screen display data corresponding to the position.

Hereinafter, each component shown in FIG. 1 will be described. [Broadcasting Device 2] The broadcasting device 2 broadcasts 3D modeling data (3DMD), which is navigation screen display data, and characteristic data indicating its characteristics from the broadcasting antenna 3 via the broadcasting artificial satellite 4. As described above, the 3D modeling data is data obtained by 3D modeling a building or a landscape for performing a bird's-eye view display of a map by car navigation. The broadcasting device 2 defines, for each 3D modeling data, an update date, an expiration date, a display position of the 3D modeling data, a priority, a guide content, and the like, and generates characteristic data PRD indicating these.

FIG. 3 is a diagram for explaining an example of the characteristic data PRD. As shown in FIG. 3, characteristic data PR
D includes update date data 21, expiration date data 22, position data 23, priority data 24, and guidance data 25. The update date data 21 is the corresponding 3D
It shows the date when the modeling data was updated. Data indicating the version of the 3D modeling data may be used instead of the update date data 21. Expiration date data 22
Indicates the expiration date of the corresponding 3D modeling data. The position data 23 indicates the position of the navigation device 6 (vehicle 7) in which the corresponding 3D modeling data is used. The position data indicates the position on the map defined by the map data used for navigation display in the navigation device 6, for example.
The priority data 24 indicates the priority order used when deleting the corresponding 3D modeling data when it is stored in the navigation device 6.

The guidance data 25 is stored in the navigation device 6
When the displayed landscape or object is designated while displaying the 3D modeling data in, the data is used to guide the attribute of the landscape or object by an image or a sound. The guidance data 25 is composed of texts, still images, animations, voices, moving images, and the like. The guidance data 25 may include, for example, advertisement data of companies or products. In this case, as shown in FIG. 4, the enterprise 10 composed of a company or a plurality of companies pays the broadcasting station 3a an advertisement fee, an advertisement distribution fee, etc. Request the creation and broadcasting of the guidance data 25 such as the building that is in the tenant. Further, the broadcasting station 3a pays a license to the manufacturer of the navigation device 6 and the map data provider.

In the above example, the broadcasting device 2 broadcasts 3D modeling data and the like via the broadcasting artificial satellite 4, but when broadcasting via the broadcasting base station 5, for example, terrestrial broadcasting is performed. Wave digital broadcasting standard D
SM-CC (Digital Storage Media Comand and Contro
l) Adopting the standard carousel broadcasting format, TS (Tra
nsport Stream) Broadcast using packets.

[Navigation Device 6] FIG. 5 is a functional block diagram of the navigation device 6 shown in FIG. As shown in FIG. 5, the navigation device 6 includes, for example, an operation unit 30, an antenna 31, a digital broadcast wave receiving unit 32,
Antenna 33, GPS processing unit 34, flash ROM 3
5, RAM 36, HDD 37, DVD drive 38, graphic controller 40, video RAM 41, display unit 42, motion sensor 43, and CPU 44.
As shown in FIG. 5, the operating unit 30, the antenna 31, the digital broadcast wave receiving unit 32, the GPS processing unit 34, the flash R
OM35, RAM36, HDD37, DVD drive 3
8, graphic controller 40, motion sensor 43,
The CPU 44 is also connected via the internal bus 29. Here, the antenna 31 corresponds to the first receiving means of the present invention, the antenna 33 corresponds to the second receiving means of the present invention, the GPS processing unit 34 corresponds to the position detecting means of the present invention, and the flash ROM 35. The HDD 37 corresponds to the storage means of the present invention, and the CPU 44 corresponds to the control means of the present invention. The first receiving means and the second receiving means of the present invention
The receiving means may be configured by using a single antenna and a reception processing unit. That is, the antennas 31 and 33 may be realized by a single antenna.

The operation section 30 is an operation means such as a pointing device on the screen of the display section 42, a guidance instruction display button, and a power switch. The digital broadcast wave receiver 32 uses the broadcasting satellite 4 to transmit the antenna 3
3 received 3D modeling data and characteristic data P
Reception processing such as RD is performed. The GPS processing unit 34 uses the GP
The position of the navigation device 6 is detected based on the positioning radio wave received by the antenna 33 via S8, and position data indicating the position is generated.

Flash ROM 35 and HDD 37
Stores a program executed by the CPU 44 and the like.
The program can be upgraded by downloading a new program via a network or digital broadcasting. The HDD 37 is shown in FIG.
As shown in, map data, 3D modeling data 3D
MD and characteristic data PRD are stored. HDD37
The 3D modeling data stored in is subject to rewriting, addition, deletion, or generation or update of link data according to the data broadcast from the broadcasting device 2, as described later. The RAM 36 stores, for example, data used for the processing of the CPU 44. DVD drive 38
Performs the reproduction processing of the DVD 39 and reads the map data from the DVD 39.

The graphic controller 40 is a CPU
3D read from the HDD 37 under the control of the 44.
Graphic processing is performed using the modeling data and the characteristic data PRD to generate display data, which is output to the display unit 42. The video RAM 41 temporarily stores the display data processed by the graphic controller 40. The display unit 42 displays a screen according to the display data input from the graphic controller 40. The motion sensor 43 detects the moving direction of the vehicle 7, and the result is C
Output to PU44. The CPU 44 controls the graphic controller 40 based on the position data generated by the digital broadcast wave receiving unit 32, the 3D modeling data generated by the digital broadcast wave receiving unit 32, and the characteristic data PRD to display a bird's eye view screen on the display unit 42. Display it. CPU
Regarding the processing of 44, the navigation device 6 which will be described later
The operation will be described in detail in association with the operation example.

An operation example of the navigation device 6 shown in FIG. 5 will be described below. [First Operation Example] In this operation example, an operation example in which the navigation device 6 shown in FIG. 5 stores the received 3D modeling data will be described. 7 and 8 are similar to FIG.
6 is a flowchart for explaining an operation example when the navigation device 6 shown in FIG. 6 stores the received 3D modeling data. Each step will be described below.

Step ST11: The 3D modeling data 3DMD broadcast by the broadcasting device 2 and the corresponding characteristic data PRD are received by the antenna 31 of the navigation device 6 shown in FIG. Then, the process proceeds to step ST12.

Step ST12: CPU 44 shown in FIG.
Is the expiration date data 22 shown in FIG. 3 in the characteristic data PRD of the 3D modeling data stored in the HDD 37.
Then, based on the date and time indicated by the built-in timer, it is determined whether or not the expired 3D modeling data exists in the HDD 37. If the CPU 44 determines that the expired 3D modeling data exists in the HDD 37, the process proceeds to step ST13, and if not, the process proceeds to step ST14.

Step ST13: The CPU 44 erases the storage of the 3D modeling data whose expiration date specified in step ST12 has passed from the HDD 37.

Step ST14: The CPU 44 updates the update date data 21 of the characteristic data PRD of the 3D modeling data received in step ST1 shown in FIG. 3 and the corresponding characteristic data PRD of the 3D modeling data stored in the HDD 37. When the update date of the 3D modeling data received in step ST1 is new, the process proceeds to step ST15, and if it is old, the process proceeds to step ST16.

Step ST15: The CPU 44 erases the storage of the 3D modeling data used for the comparison in step ST14 from the HDD 37.

Step ST16: The CPU 44 causes the GPS
Based on the position data of the vehicle 7 detected by the processing unit 34 and the moving direction of the vehicle 7 detected by the motion sensor 43 as necessary, the 3D modeling data received in step ST11 indicates the range in which the vehicle 7 can move. Determine whether it is a thing. Then, the CPU 44 proceeds to the process of step ST17 when determining that the 3D modeling data received in step ST11 is within the movable range of the vehicle 7, and ends the process otherwise. Here, the CPU 44 determines whether or not the vehicle 7 is 3D modeling data in a movable range based on, for example, the distance between the position corresponding to the received 3D modeling data and the position of the vehicle 7, or the map data. Judgment is made based on the specified topography between the two. As a result, 3D modeling data that is likely to be used in the near future can be updated preferentially, and HD
The limited storage area of D37 can be effectively used.

Step ST17: The CPU 44 determines whether or not the HDD 37 has an empty storage area capable of storing the 3D modeling data received in step ST11,
If it is determined that there is an empty storage area, step ST
If not, the process proceeds to step ST2.
The process proceeds to 0.

Step ST18: The CPU 44 uses the 3D modeling data received in step ST11 for the HDD3.
Store in 7. The storage is stored, for example, at the address where the erased 3D modeling data was stored. The CPU 44 also stores the characteristic data PRD received in step ST11 in the HDD 37 in association with the 3D modeling data.

Step ST19: The CPU 44 is the HDD
Link data between the position defined by the map data stored in 37 and the 3D modeling data stored in step ST18 is generated, and the generated link data is registered in a predetermined management table. The old link data may be updated instead of generating the link data.

Step ST20: The CPU 44 sends the priority data 24 shown in FIG. 3 of the characteristic data PRD of the 3D modeling data received in step ST1 and HD.
The priority data 24 of the characteristic data PRD of the 3D modeling data stored in D37 is compared, and it is determined whether or not the 3D modeling data having a lower priority than the received 3D modeling data exists in the HDD 37, and it is determined that the HDD 37 exists. If yes, step ST2
If not, the process ends.

Step ST21: The CPU 44 erases the storage of the low-priority 3D modeling data specified in step ST20 from the HDD 37, and then the step S
The process returns to T17.

[Second Operation Example] In this operation example, a case where the navigation device 6 displays a bird's-eye view when the vehicle 7 is moving or the like will be described. FIG. 9 shows a navigation device 6
6 is a flowchart for explaining a case where a bird view display is performed when the vehicle 7 is moving. Step ST31: The antenna 33 of the navigation device 6 shown in FIG. 5 receives the positioning radio wave according to the position of the vehicle 7, and the GPS processing unit 34 generates the position data of the vehicle 7 based on the positioning radio wave.

Step ST32: CPU 44 shown in FIG.
Reads the 3D modeling data corresponding to the position data detected in step ST31 from the HDD 37.

Step ST33: The CPU 44 outputs the 3D modeling data read in step ST32 to the graphic controller 40, and the graphic processing by the graphic controller 40 is performed.
Let the bird view display.

Step ST34: The CPU 44 judges whether or not the object or the scenery in the bird's-eye view display is specified according to the operation of the operation unit 30 by the user during the bird's-eye view display. Is step ST
If not, the process proceeds to step ST3.
Return to processing of 1.

Step ST35: The CPU 44 reads the guide data 25 of the characteristic data PRD corresponding to the object or landscape designated in step ST34, outputs it to the graphic controller 40, and outputs the guide data 25 to the graphic controller 40. As a result, based on the guidance data 25, the attribute data of the designated object or landscape is displayed on the display unit 42.

In this embodiment, for example, when the bird's-view display of the building 120 is demolished and a new building is constructed as shown in FIG. 10 (A), the navigation device 6 displays the result as shown in FIG. 10 (B). As shown, the 3D modeling data of the new building 121 is received and the building 120 is received.
By rewriting the 3D modeling data of
As shown in 0 (B), it is possible to perform a bird's eye view display that is closer to the actual scenery.

As described above, according to the car navigation system 1, when the actual building or landscape changes, the broadcasting device 2 broadcasts the 3D modeling data corresponding to the change, and the 3D modeling data is changed. Is received by the navigation device 6 and stored in the HDD 37.
By automatically updating the modeling data, the user of the navigation device 6 can obtain a bird's-eye view display corresponding to a change in the actual building or landscape without purchasing a new DVD 39. Therefore, the navigation effect can be enhanced. In addition, it is possible to promote the use of the broadcasting station and increase the audience rating of the broadcasting station program.

The present invention is not limited to the above embodiments. For example, in the above-described embodiment, the case where the 3D modeling data and the characteristic data PRD are created, edited, and programmed by the broadcasting device 2 has been exemplified, but a device such as an advertising agency or a production company like a CM is used. make,
It may be provided to the broadcasting device 2. Also, DVD
When a rewritable 39 is used, the received 3D modeling data and link data may be written in the HDD 37. Further, the process of step ST20 shown in FIG. 8 performed by the navigation device 6 may be performed when the target 3D modeling data display process is performed. Further, as a business model, 3D modeling data that displays a building of a company may be given a high priority according to the usage fee paid.

[0047]

As described above, according to the present invention,
It is possible to provide a navigation device, a navigation system, and a method thereof that can easily update the navigation screen display data for displaying a bird view and the like without burdening the user.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a car navigation system according to an embodiment of the present invention.

FIG. 2 is a flowchart for explaining an outline of operation of the car navigation system shown in FIG.

FIG. 3 is a diagram for explaining an example of characteristic data PRD.

FIG. 4 is a diagram for explaining a business model of the car navigation system shown in FIG. 1.

FIG. 5 is a functional block diagram of the navigation device shown in FIG.

FIG. 6 is a diagram for explaining data stored in the HDD shown in FIG.

7 is a flowchart for explaining an operation example when the navigation device shown in FIG. 5 stores received 3D modeling data.

FIG. 8 is a flowchart for explaining an operation example when the navigation device shown in FIG. 5 stores the received 3D modeling data.

FIG. 9 is a flowchart for explaining a case where the navigation device displays a bird's-eye view when the vehicle moves.

FIG. 10 (A) is a diagram for explaining a bird view screen before updating 3D modeling data, and FIG. 10 (B) is a diagram for explaining a bird view screen after updating 3D modeling data.

[Explanation of symbols]

1 ... Car navigation system, 2 ... Broadcasting device, 3 ...
Broadcast antenna, 4 ... Broadcast satellite, 5 ... Broadcast base station, 6 ... Navigation device, 7 ... Vehicle, 8 ... GPS,
30 ... Operation part, 31 ... Antenna, 32 ... Digital broadcast wave receiving part, 33 ... Antenna, 34 ... GPS processing part, 35 ...
Flash ROM, 36 ... RAM, 37 ... HDD, 38
... DVD drive, 39 ... DVD, 40 ... Graphic controller, 41 ... Video RAM, 42 ... Display section, 4
3 ... Motion sensor, 44 ... CPU

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 2C032 HB02 HB11 HB22 HB23 HC08                       HC23 HC31                 2F029 AA02 AB01 AB07 AB13 AC02                       AC03 AC04 AC14 AC18                 5H180 AA01 BB13 CC12 FF05 FF13                       FF22 FF25 FF27 FF32 FF38

Claims (13)

[Claims] 1. A navigation device mounted on a mobile body, comprising first receiving means for receiving digitally broadcasted navigation screen display data and characteristic data, and second receiving means for receiving position detection data. Means, position detecting means for detecting the position of the moving body based on the received position detection data, storage means for storing navigation screen display data, and the received based on the received characteristic data Rewriting or addition of the navigation screen display data stored in the storage means by the navigation screen display data,
Erase the stored navigation screen display data,
Alternatively, the link data to the navigation screen display data is generated or updated, the characteristic data is stored in the storage means in association with the navigation screen display data, and the navigation screen display corresponding to the detected position of the moving body. A navigation device comprising: a control unit that performs a process of reading data from the storage unit and displaying the data. 2. The first receiving means receives the navigation screen display data for performing a bird's-eye view display of a landscape or an object, and the control means controls the navigation corresponding to the detected position of the moving body. The navigation device according to claim 1, wherein bird view display is performed using screen display data. 3. The first receiving means receives the characteristic data including position data corresponding to the digitally broadcast navigation screen display data, and the control means includes the characteristic data and the detected movement. Rewriting or addition of the navigation screen display data stored in the storage means by the received navigation screen display data, deletion of the stored navigation screen display data, or a link to the navigation screen display data based on the position of the body The navigation device according to claim 1, which generates or updates data. 4. The first receiving means receives the characteristic data including at least update date data or version data of the digitally broadcast navigation screen display data, and the control means changes the received characteristic data. The included update date data or version data is compared with the update date data or version data corresponding to the navigation screen display data already stored in the storage means, and the received navigation screen display data is newer. In this case, the navigation screen display data stored in the storage means is rewritten or added by the received navigation screen display data, the stored navigation screen display data is erased, or link data to the navigation screen display data is generated or update The navigation device according to claim 1, wherein 5. The first receiving means receives the characteristic data indicating an expiration date of the digital broadcast navigation screen display data, and the control means stores the characteristic data in the storage means based on the characteristic data. The navigation device according to claim 1, wherein among the stored navigation screen display data, the navigation screen display data whose expiration date has passed is deleted. 6. The first receiving means receives the characteristic data indicating the priority of the digitally broadcast navigation screen display data, and the control means, if necessary, based on the characteristic data, 2. The navigation device according to claim 1, wherein the navigation screen display data having a lower priority among the navigation screen display data stored in said storage means is preferentially erased. 7. The storage means lowers the priority indicated by the characteristic data of the navigation screen display data corresponding to a position outside the predetermined range from the detected position among the navigation screen display data stored in the storage means. The navigation device according to claim 6. 8. The first receiving means receives the characteristic data including at least attribute data indicating an attribute of a landscape or an object displayed by the navigation screen display data, and based on the navigation screen display data, the characteristic data. The navigation device according to claim 1, wherein when the landscape or the object is designated while the landscape or the object is displayed, a process of displaying the attribute data corresponding to the designated landscape or the object is performed. 9. The storage means stores map data, and the control means generates link data indicating a link between the received navigation screen display data and the map data, and stores the link data in the storage means. The navigation device according to claim 1, wherein the navigation device is written in. 10. The control means specifies the navigation screen display data using the link data corresponding to the detected position of the moving body on the map defined by the map data, and specifies the navigation screen display data. The navigation device according to claim 1, wherein the navigation screen display data is read from the storage means and displayed. 11. A navigation system having a transmitter for broadcasting navigation screen display data and characteristic data, and a navigation device mounted on a mobile body, wherein the navigation device is digitally broadcast navigation screen display data. And a characteristic data, a second receiving means for receiving the position detecting data, and a position detecting means for detecting the position of the moving body based on the received position detecting data. A storage means for storing the navigation screen display data, based on the received characteristic data, rewriting or addition of the navigation screen display data stored in the storage means by the received navigation screen display data,
Erase the stored navigation screen display data,
Alternatively, the link data to the navigation screen display data is generated or updated, the characteristic data is stored in the storage means in association with the navigation screen display data, and the navigation screen display corresponding to the detected position of the moving body. A navigation system comprising: a control unit that performs a process of reading data from the storage unit and displaying the data. 12. A navigation method performed by a navigation device mounted on a mobile body, comprising: receiving navigation screen display data and characteristic data which are digitally broadcast; receiving position detection data; A step of detecting the position of the moving body based on the received position detection data, and a navigation screen stored in the storage means of the navigation device according to the received navigation screen display data based on the received characteristic data Rewriting or adding display data, deleting the stored navigation screen display data, or generating or updating link data to the navigation screen display data, and the characteristic data in association with the navigation screen display data, Storing in a storage means; Navigation method and a step of a navigation screen display data performs processing for displaying read from said memory means corresponding to the position of the the mobile. 13. The bird's-eye view display is performed using the navigation screen display data corresponding to the detected position of the moving body, wherein the navigation screen display data for performing the bird's-eye view display of a landscape or an object is received. 12. The navigation method according to item 12.