JPH04367890A - Residential land navigation device - Google Patents

Abstract

PURPOSE:To further improve the visual recognition of the destination when a vehicle, which is equipped with a residential land navigation device to confirm the present location of the vehicle, comes close to the destination. CONSTITUTION:A residential land navigation device has various sensors to obtain present location A of a vehicle, reads out the map of a certain region centered around the vehicle's present location A from the database and display it with the present location A and the vehicle's destination which are super-imposed on the display. The device has a distance computing section 1 which computes a distance L between the present location A and the destination B, a distance judgement section 2 which compares the distance L and a prescribed distance L0 to find out which one of the distances is larger and a display center changeover section 3 which switches the center of the display if the distance L is larger than the prescribed distance L0, the map is displayed centered around vehicle's present location A and if the distance L is smaller than the prescribed distance L0, the map is displayed centered around the vehicle's destination B.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a residential land navigation system for confirming the current position of a vehicle. In particular, the present invention aims to improve visibility when a vehicle approaches a destination.

0002

2. Description of the Related Art In recent years, an increasing number of passenger cars are equipped with navigation devices. When displaying the current position on a display device such as a CRT or LCD by marking it on a map using the location function that accurately recognizes the current position of the vehicle, place the current position in the center of the display screen and scroll the map. A method in which the map of your surroundings always moves around you is becoming commonplace. This is because if you fix the screen and move the mark that is the current position of the vehicle, when the mark advances from one end of the display screen to the other, the display screen will switch to the next screen and the mark will return to the opposite position. This is because the display screen becomes difficult to see.

[0003] Therefore, navigation devices that are becoming popular in passenger cars display the current position obtained by a location device on a display device such as a CRT, and display the current position at a rate of 1/50,000 to 1/2.
The surrounding road map is displayed by superimposing markers (marks indicating the current location) on a road map with a scale of about 10,000. When setting a destination and trying to get a guide to that location, such devices display a destination mark on the map and drive toward that destination.

[0004] When the destination cannot be seen from the currently displayed map area due to a problem with the scale of the map displayed on the screen, the distance and direction are superimposed and displayed. Furthermore, when a destination appears on the display screen, a destination value mark is superimposed on that position.

[0005]

[Problem to be Solved by the Invention] However, in conventional residential land navigation, when there is no destination on the display screen, the current position of the vehicle is at the center of the display screen, but when the destination is on the display screen, had the problem that the current position of the vehicle was in the center of the display screen, and the destination appeared to be approaching the current position of the vehicle. Conversely, if the destination is set as the center from the beginning, if the current position of the vehicle and the destination are far apart, the current position cannot be displayed on the display screen.

SUMMARY OF THE INVENTION Therefore, in view of the above-mentioned problems, it is an object of the present invention to provide a residential land navigation device that can improve visual recognition by displaying information centered around the destination in the vicinity of the destination.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a residential land navigation device with a distance calculation section, a distance judgment section, and a display center switching section. The distance calculation unit calculates the distance L between the current position A of the vehicle and the destination B. The distance determining section compares the distance L with a predetermined distance L0 to determine the magnitude.

[0008] The display center switching unit displays the current position A of the vehicle on the map when the distance L is larger than a predetermined distance L0, and displays the destination B of the vehicle when the distance L is smaller than the predetermined distance L0. Display it on the map in the center.

[0009]

[Operation] According to the residential land navigation device of the present invention, the distance calculation section calculates the distance L between the current position A of the vehicle and the destination B, and the distance judgment section compares the distance L with a predetermined distance L0. The size is determined, and if the distance L is larger than a predetermined distance L0, the current position A of the vehicle is displayed at the center of the map, and if the distance L is smaller than the predetermined distance L0, the display center switching section displays the vehicle's current position A at the center of the map. is displayed in the center of the map, it is possible to realize a display method that suits human sensibilities and improve visibility.

0010

[Example] Hereinafter, an example of the present invention will be described with reference to screens. FIG. 1 is a diagram showing a residential land navigation device according to an embodiment of the present invention. The configuration of this figure will be explained. The residential land navigation device shown in this figure includes a distance calculation unit 1 that calculates the distance L between the current position A of the vehicle and a destination B, and a distance judgment unit that compares the distance L with a predetermined distance L0 and determines the magnitude. 2, a display center for displaying a map centered on the vehicle position A when the distance L is larger than a predetermined distance L0, and displaying the map centered on the vehicle's destination position B when the distance L is smaller than the predetermined distance L0; A switching unit 3, various sensors 4 attached to the vehicle to detect the vehicle speed, direction, rotation angle, etc., and a location processing unit 5 that calculates the position of the vehicle from the data of the various sensors 4, a global position device 6 that provides reference position data to the location processing section 5 to improve the position accuracy of the location processing section 5; and an artificial sanitation device 7 that communicates with the global position device 6 to create the reference position data of the vehicle. , an operating section 8 of the residential land navigation device; a destination coordinate storage section 9 that displays, for example, a target map using the operating section 8 and stores a destination entered with a cursor; Switching When the coordinates of the vehicle's current location or destination from FIG. A. A location display control unit 11 that performs control to display destination B, and the location database unit 1
Displays map data from 0, and superimposes current location A on top of this.
and a display 12 that displays destination B.

Next, the operation of this embodiment will be explained. FIG. 2 is a flowchart illustrating the operation according to the embodiment of the present invention. In this diagram, first set the destination (Step 1)
). To set this destination, use the operation unit 8 in FIG.
Via the location display control section 11, a road map or the like including the destination is displayed on the display 12 from the location database section 10. Further, the coordinates of the destination to be set on the road map displayed by the cursor of the operation section 8 are stored in the destination coordinate storage section 9.

The location database section 10 will now be explained. FIG. 3 is a diagram showing the configuration of the location database section of FIG. 1. The location database unit 10 is a CDROM (Compact Disk Re
ad Only Memory), and includes a road map database section 10-1, a residential road map database section 10-2, and the database sections 10-1 and 10-2.
It consists of a switch section 10-3 for switching. The road map database unit 10-1 has a capacity of, for example, 64K bytes, and the residential road map database 10-2 has a capacity of, for example, 64K bytes.
It has a capacity of 4 bytes, and its specific contents will be described later.

Note that the display 12 may be a CRT, a liquid crystal display, or the like. The destination set in this way is displayed on the display 12 (step 2). FIG. 4 is a diagram showing switching of display markers on a road map. Figure 4(a)
Then, on the road map displayed on the display 12, the destination B and the current vehicle position A are displayed with the current position A as the center. This map shows 1/1 output from the road map database section 10-1.
A road map of an area of 2 km in length x km in width is shown at a scale of about 50,000 to 1/10,000, and the current position A is displayed at the center of the display 12 with respect to destination B.

Next, the distance between the vehicle's current position A and the destination B is calculated (step 3). The current position A of the vehicle is determined by the following cumulative calculation of the coordinates (x, y) of the vehicle position A in the location processing unit 5 using signals such as the vehicle, direction, rotation angle, etc. that are input from various sensors 4 every moment. can be obtained as follows.

[0015]

[Math 1]

[0016] These x and y are corrected at regular intervals using reference position data of the global position device. Further, if the coordinates of the destination value B are (x0, y0), the distance calculation unit 1 inputs the data of (x, y) from the location processing unit 5, and the data of (x0, y0) is input from the destination coordinate storage unit 9.
) by entering the data

[0017]

[Math 2]

Calculate . Next, the distance judgment unit 2 calculates the distance L obtained by the distance calculation unit 1 and the preset distance L0.
and determine whether L>L0 (Step 4)
. At the beginning of departure, usually L>L0. When L>L0, the switch 10-3 causes the road map base data section 10-1 to
When selecting the road mode (step 5), the current position A of the vehicle is displayed at the center of the display as shown in FIG. 4(a). In FIG. 4A, destination B is displayed on the same display screen, but when the distance L is large, destination B is not displayed.

Next, update the map display (step 7)
. FIG. 5 is a diagram illustrating the processing contents of the location display control section of FIG. 1. This diagram (1) shows main roads X and Y,
In order to simplify the explanation, the description will be made without displaying other roads. When a vehicle travels on a main road The database section 10 cuts out an area around the marker A and displays it on the display 12 via the location display control section 11 as shown in FIG. 2(2). Therefore, the coordinates (x
, y) are displayed on the display unit 1 via the location display control unit 11.
It will be displayed in the center of 2. Furthermore, when the vehicle has traveled for a certain period of time and is at the position of marker B in FIG. In the location display control section 11, as shown in FIG.
Data is transferred from area A, which is displayed at the center of marker A, in area b, which is centered on marker A, and new data is read out from the database unit 10 only for area C, thereby speeding up data updating. Note that navigation can be obtained not only by the screen display but also by audio guidance.

Next, in step 4 via step 8, L<
When it reaches L0, the distance judgment unit 2 goes through step 9.
The display center switching unit 3 is switched, and the coordinates (x0, y0) of the destination B from the destination coordinate storage unit 9 are input to the location database unit 10. A map of the area centered on the destination B is cut out from the location database unit 10 and is displayed in the location display control unit 1.
1 on the display (step 10).

FIG. 4(b) displays a road map centered on the destination B that has been switched because L<L0. In comparison with FIG. 4(a), FIG. 4(b) is fixed with respect to the movement of the vehicle, and the current position A of the vehicle is updated and displayed every moment as it approaches the destination B at the center of the display (step 8). Next, the case where the mode is set to residential area mode in step 5 will be explained. Switching to the residential area mode may be controlled manually from the operation unit 8 or may be controlled automatically, and as shown in FIG. Force output.

FIG. 6 is a diagram showing switching of display markers on a residential map. In this figure, the area size of one screen displayed on the display 12 is, for example, 350 m in width x 200 m in height.
The scale is approximately 1/5000 to 1/500, and residential maps necessary for business are displayed. The residential map database section 10-2 in FIG. 3 includes addresses, roads,
Plans of buildings and facilities along or between roads;
The names of buildings, facilities, roads, intersections, bus stops, train tracks, stations, etc. are stored. In FIG. 6, addresses, major buildings, etc. are displayed in the dimensions of the displayed residential map, but small buildings, etc. may be displayed by enlarging the map as necessary.

If L>L0, the current position A of the vehicle is displayed at the center of the screen as shown in FIG. 4(a) (step 12). In the case of L>L0 (step 4), Fig. 4 (
Destination B is displayed at the center of the screen as shown in b) (step 13). Other Map Display Updates (Step 7) Current location marker display updates (Step 11) are updated in the same manner as described above.

[0024]

As explained above, according to the present invention, the distance between the current position of the vehicle and the destination is determined, and when the vehicle is further away than the destination, the vehicle is displayed in the center of the map. When the vehicle approaches the destination, the destination is displayed in the center of the map, so a display method that matches human sensibilities can be achieved, and automatic switching simplifies operation.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a residential land navigation device according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating the operation according to the embodiment of the present invention.

FIG. 3 is a diagram showing the configuration of a location database section in FIG. 1;

FIG. 4 is a diagram showing switching of display markers on a road map.

FIG. 5 is a diagram illustrating the processing contents of the location display control unit in FIG. 1;

FIG. 6 is a diagram showing switching of display markers on a residential map.

[Explanation of symbols]

1...Distance calculation section 2...Distance judgment section 3...Display center switching section 4...Various sensor parts 5...Location processing unit 8...Operation unit 9...Destination coordinate storage unit 10...Location database section 11...Location display control section 12...Indicator

Claims (1)

[Claims] [Claim 1] The current position A of the vehicle is equipped with various sensors.
In a residential land navigation system, the vehicle's current location A and the vehicle's destination B are superimposed and displayed on the map, and the vehicle's current location A and the vehicle's destination B are superimposed on the map. a distance calculation unit (1) that calculates the distance L between position A and destination B;
a distance determining unit (2) that compares the distance L with a predetermined distance L0 to determine the magnitude thereof; and a distance determining unit (2) that compares the distance L with a predetermined distance L0 to determine the magnitude thereof; is smaller than a predetermined distance L0, the display center switching unit (3) causes the map to be displayed centered on the destination B of the vehicle.