JP2001255159A - Navigation apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a navigation apparatus, in which a easy to understand guidance display is performed, to be provided to a user by excluding roads which are not required for the guiding a route at a prescribed point of the route, which enhances visibility of the guidance display and which can recognize a course easily in a guidance point. SOLUTION: The guidance display is performed in front a point at a prescribed distance from the prescribed point. All pieces of information are not displayed with reference to the prescribed point, a road required for the guidance of the route is determined and displayed, since the display of the road which is not required for the guidance of the route is restricted, the guidance display can be performed clearly. Consequently, visibility of the guidance display can be enhanced, and the direction to be advanced at the guidance point can be recognized easily and accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a navigation apparatus for a mobile object which searches for a route to a destination and provides route guidance.

[0002]

2. Description of the Related Art FIG. 4 is a diagram showing an example of a screen using a road map, and FIG. 5 is a diagram showing an example of a guidance display screen based on an intersection map. In a mobile navigation system, when a route to a destination is calculated based on a point input such as a destination, and route guidance is performed using screens and voices based on the calculated guide route, guidance for turning right and left At the intersection, route guidance based on the enlarged view of the intersection is performed. In the route guidance by map, as shown in FIG. 4, a road map of a moving body, for example, a surrounding road where the current position of the vehicle is slightly below the center is displayed together with roadside features, and the map is colored on the road. The displayed guidance route 20 and the current position mark 21 (dashed circle and triangle mark) are displayed in an overlapping manner. In the figure, a thick solid line 22 indicates an overpass, and a thin line indicates a general lower road including a road passing under the overpass. When the current position 21 is a predetermined distance before the guidance intersection 22 (a predetermined point on the route) to be turned next, for example, 400 m, the screen is zoomed in to an enlarged view of the intersection as a guidance display screen as shown in FIG. A point which becomes a mark of an intersection with the route 20 and the current position mark 21;
For example, gas station GS, convenience store,
Bank BK, public facilities, etc. are also displayed with logos and landmarks.

[0003]

However, when an enlarged view of an intersection is displayed, all the roads are displayed as shown in FIG. 5. Therefore, when a plurality of roads exist near the displayed intersection, the display screen is displayed. Has become complicated, the visibility of the screen has deteriorated, and a problem has arisen that the traveling route to be followed cannot be immediately recognized.

The present invention has been made to solve the above-mentioned problem, and provides a user with a guidance display which is more easily understood by displaying a road at a predetermined point on a route except for a road unnecessary for guidance, and visually confirming the guidance display. It is an object of the present invention to provide a navigation device capable of improving the operability and easily recognizing a course at a guidance point.

[0005]

According to the first aspect of the present invention, there is provided a display, a map storage means in which at least map data and route calculation road data are recorded, and a current position of a moving body is detected. Current position detecting means, map display means for reading map data from the storage means based on the current position detected by the current position detecting means, and displaying a map superimposed on the current position; Route setting means for setting a route to a destination based on the storage means, when the mobile unit detects that the moving body has approached a predetermined point on the route, displays a guidance display on a route to be traveled based on the storage means. Guidance display means, wherein the guidance display means determines whether a road near the predetermined point is connected to the guidance path, and It is provided with guidance display restriction means for restricting display of a road not connected to a guideway.

According to a second aspect of the present invention, there is provided a display, map storage means for storing at least map data and road data for route calculation, current position detection means for detecting a current position of a moving object, Map display means for reading map data from the storage means based on the current position detected by the current position detection means and displaying a map superimposed on the current position; and a route to a destination based on the route calculation road data. Route setting means for setting, and guidance display means for causing the display to display a guidance display on a route to be traveled based on the storage means when detecting that the moving body has approached a predetermined point on the route,
A guidance display means for determining whether or not a road near the predetermined point is connected to the taxiway, and restricting display of a road not connected to the taxiway. Means for determining whether or not a road near the predetermined point is connected to the taxiway, and a second guidance display restricting means for restricting a display range of the road connected to the taxiway. It is characterized by.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [1. Description of Configuration] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a system block diagram as an example of a hardware configuration of a navigation system according to an embodiment of the present invention. 1 in the figure
Is an absolute position / azimuth detection unit represented by GPS,
It consists of an antenna, a receiver and the like. 2 is a relative azimuth detecting unit using a gyro sensor or the like. Reference numeral 3 denotes a vehicle speed detector for processing a vehicle speed pulse obtained from the vehicle. A main CPU 4 includes peripheral circuits and controls the entire system. Reference numeral 5 denotes a memory for storing various data.
ROM 5a accessed from 4, a dynamic RAM (DRAM) 5b for loading the main program, and a static RAM for storing the memory contents when the main power is off and backing up the battery when the power is switched off to on
(SRAM) 5c, and provided for the display unit of the display unit 10.
It is composed of a VideoRAM (VRAM) 5d. Reference numeral 9 denotes a display unit 10 serving as a display for displaying maps and menus, and a user interface unit connecting the main CPU 4 with an input unit 11 for inputting various information by a user. 12
Is for reading a database such as a CD-ROM 12a.
CD-ROM control unit. Reference numeral 13 denotes an FM multiplex broadcast receiving and processing unit for extracting desired data from FM broadcast waves. 14 is VICS
(Vehicle Information & Communication System) An optical / radio wave beacon reception processing unit that receives service data.

Next, an example of a current position display operation according to the embodiment of the present invention will be described. First, an approximate current position obtained by sensors such as an absolute position / direction detection unit 1, a relative direction detection unit 2, and a vehicle speed detection unit 3, a current direction,
The current position is calculated from the mileage. Since the calculated current position includes an error and the road coordinate data also has an error,
In many cases, the position does not match the position on the road included in the map data recorded on the CD-ROM, so the map matching process is performed. The map matching process searches the map data for a route included in a predetermined range around the current position calculated by sensors such as the absolute position / azimuth detecting unit 1, the relative azimuth detecting unit 2, and the vehicle speed detecting unit 3. After that, all roads and facilities within a predetermined range around the current position are Vide
The video is recorded in the oRAM 8 to update the VideoRAM 8 and displayed on the display unit 10.

When a destination is input from the input unit 11, the main CPU 4 calculates an optimum route from the current position to the destination using the route calculation data on the CD-ROM 12a.
Thereafter, when the vehicle travels along the set route and the vehicle position reaches a predetermined distance from a point requiring guidance such as turning right or left, the main CPU 4 enlarges the vicinity of the guidance point based on the map data in the CD-ROM 12a. The figure is created, and the vehicle position is superimposed on the enlarged view with the right and left turn instruction marks.
Is updated and displayed on the display unit 10.

[2. Description of Operation] Now, the main CP according to the first embodiment will be described with reference to the flowchart of FIG. 2 and a diagram showing an example of the guidance display screen according to the embodiment of FIG.
The operation of U4 will be described. First, as described above, when the vehicle position reaches a predetermined distance from a point requiring guidance such as turning left or right, the main CPU 4 starts creating an enlarged view near the guidance point. At this time, the main CPU 4 reads out the map data. It is determined whether the road to be displayed is a taxiway (S
1) In the case of a taxiway, all road data included in the display range of the enlarged view is written and displayed in the VideoRAM 8 (S).
2). If the road to be displayed in S1 is not a taxiway, it is further determined whether the road is connected to a taxiway (S3). That is, it is assumed that the connection is made when there is an intersection between the road and the taxiway (including a case where nodes have the same coordinates).

If the connection is not established in S3, the display is restricted and the road is not displayed. If it is connected in S3, it is determined whether or not it is connected to an intersection requiring further guidance (S4). If the vehicle is connected to an intersection, all the roads are displayed as before. If the vehicle is not connected to an intersection requiring guidance at S4, it is further determined whether or not the vehicle can be driven (it is possible to go from the taxiway to the road) (S5).
The road is not displayed. When it is possible to go to the road from the taxiway in S5, a predetermined distance from the connection point, for example, 30 m
Just show.

FIG. 3 shows an example of a guidance display screen according to the present embodiment. The guidance route 2 includes a guidance point 22 for instructing a right or left turn.
2 displays the entire screen, and the roads 17a and 17b connected to the guidance point 22 display the range of the road (a road link having the guidance point 22 as one end). Further, the road connected to the taxiway is within a predetermined distance 18 from the connection point with the taxiway.
Only show the road. In the example of the figure, since the taxiway partially includes an overpass, the display of all general lower roads that are not directly connected to the overpass is limited and is not displayed.

Note that the present invention is not limited to the above-described embodiment, and various modifications are possible. For example, in the above embodiment, the road connected to the taxiway is displayed only within a predetermined distance range from the connection point with the taxiway, but the road within the range included in the predetermined display frame is displayed. However, it goes without saying that the same can be applied.

[0014]

As is apparent from the above description, according to the present invention, the guidance display is displayed at a predetermined distance before a predetermined point, and not all information is displayed at the predetermined point. Determines and displays the roads required for route guidance,
Since the display of the road unnecessary for the route guidance is restricted, the guidance display can be clearly displayed. Therefore, the visibility of the guidance display can be improved, and the direction in which the vehicle should proceed at the guidance point can be easily and accurately recognized.

[Brief description of the drawings]

FIG. 1 is a system block diagram showing an embodiment of a mobile navigation device according to the present invention.

FIG. 2 is a flowchart showing a guidance display process according to the embodiment.

FIG. 3 is a diagram showing an example of a guidance display screen according to the embodiment.

FIG. 4 is a diagram illustrating an example of a screen using a road map.

FIG. 5 is a diagram showing an example of a guidance display screen based on an intersection diagram.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Absolute position and direction detection part 2 ... Absolute direction detection part 3 ... Vehicle speed detection part 4 ... Main CPU 5 ... Memory 10 ... Display part 12 ... CD-ROM control part 20 ... Guidance route 22 ... Guidance point 23 ... Overpass 24 … Lower road

Claims (3)

[Claims] 1. A display; a map storage means in which at least map data and route calculation road data are recorded; a current position detection means for detecting a current position of a moving object; Map display means for reading map data from the storage means based on the current position, and displaying a map superimposed on the current position; route setting means for setting a route to a destination based on the route calculation road data; Guidance display means for displaying, on the display, a guidance display on a route to be traveled based on the storage means when detecting that the moving body has approached a predetermined point on the route, wherein the guidance display means comprises: A guide table for determining whether or not a road near the predetermined point is connected to the taxiway and restricting display of a road not connected to the taxiway A navigation device comprising a display restriction means. 2. A display; a map storage means in which at least map data and road data for route calculation are recorded; a current position detection means for detecting a current position of the moving object; Map display means for reading map data from the storage means based on the current position, and displaying a map superimposed on the current position; route setting means for setting a route to a destination based on the route calculation road data; Guidance display means for displaying, on the display, a guidance display on a route to be traveled based on the storage means when detecting that the moving body has approached a predetermined point on the route, wherein the guidance display means comprises: First determining whether or not a road near the predetermined point is connected to the taxiway and restricting display of a road not connected to the taxiway; Guidance display restriction means, and a second guidance display restriction means for judging whether or not the road near the predetermined point is connected to the taxiway, and restricting a display range of the road connected to the taxiway. A navigation device comprising: 3. The navigation device according to claim 2, wherein the display range is set within a predetermined distance from the taxiway.