JPH04143615A - Apparatus for displaying current position of moving body - Google Patents

Abstract

PURPOSE:To make it possible to expand effectively a map area in the direction of advance of a vehicle as well as a map area in the direction of a destination viewed from the current position by shifting the current position, together with a map, by a prescribed amount in a prescribed direction in accordance with a relative angle of each direction. CONSTITUTION:When a destination O is set on a map, the current position located in the center of a drawing is shifted together with the map by a prescribed amount and displayed on the opposite side to the destination viewed from the current position, in a prescribed direction in accordance with an angle formed by the direction of advance of the vehicle at the current position and the direction of the destination viewed from the current position, so that map areas in the direction of the destination viewed from the current position and also in the direction of advance of the vehicle be expanded on the drawing. By a data processing by a prescribed algorithm in a signal processing device 3, in other words, the current position is displayed at a point P' which is located on the bisector of the angle thetaformed by the direction of advance of the vehicle at the current position P and the direction of the destination O viewed from the current position P and which is obtained by a shift by a prescribed distance l from the center of the drawing onto the opposite side to the destina tion O. By this method, a map area in the direction of the destination viewed from the current position can be expanded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a current position display device for a moving object that displays the current position of the moving object on a map displayed on a screen in advance while determining the current position of the moving object.

Ryoraien 1 Recently, when driving a mobile object such as a car in an unfamiliar area, for example, in order to provide driving guidance so that the vehicle does not deviate from the planned course and get lost, the distance traveled and the direction in which the mobile object is traveling has been changed. While detecting each of these, the current position on the two-dimensional coordinates, which changes every moment as the moving object moves, is calculated one after another, and the map information of the area to be traveled is read out from the map information storage medium in advance and displayed on the screen. A device for displaying the current position of a moving object has been developed that updates and displays the current position of the moving object on a road map.

Conventionally, in such a current position display device for a moving object, in order to improve the visibility of the current position on the screen, the moving object is moved on a map that has the same two-dimensional coordinates as the two-dimensional coordinates from which the current position is determined. The current position of the moving object is always displayed in the center of the screen while scrolling in the direction of movement.

However, if the current position is displayed in the center of the screen in this way, it is only possible to see ahead of the map area, which is approximately half of the screen in the direction of movement of the moving object. When setting a destination, the field of view in the direction of the destination from the current location on the screen becomes narrow.

Therefore, conventionally, as shown in Figure 6(a), when a destination ○ is set on a map, the current position W as seen from the destination ○ is
In the IP direction, the current position [P in the center of the screen is displayed at a position P' shifted by a predetermined amount along with the map (see Japanese Utility Model Publication No. 1-128121).

However, by using such an offset method for displaying the current position, the current position i! Destination O seen from P'
Because the map area in the direction of
As shown in Figure (a), this is fine if the moving object is moving in the direction of destination 0 (the arrow in the figure indicates the moving direction of the moving object at the current position), but if the moving object is If the direction of travel is different from the direction of destination O due to a detour, etc., the map area in the direction of travel will be narrowed and the visibility ahead will be poor, as shown in Figure 6 (b). I end up.

I]η The present invention has been made in consideration of the above points, and as the moving object moves, the current position of the moving object is displayed at a fixed position on the screen while scrolling the map in the direction of movement of the moving object. When displaying a map that is shifted by a predetermined amount from its regular position on the screen according to the relationship between the destination set on the map and the current position on the map, the direction of the shift is optimally determined and the current position on the 5-screen is displayed. To provide a current position display device for a moving object that can effectively expand not only the map area in the direction of the destination as viewed from the front, but also the map area in the moving direction of the moving object.

In order to achieve this purpose, the present invention considers the direction of movement of the moving object at the current position in addition to the direction of the destination as seen from the current position, and calculates the distance from the fixed position on the screen according to the relative angle of each direction. The direction in which the current position is to be shifted is determined, and the current position is shifted along with the map by a predetermined amount in the determined direction.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a configuration example of a current position display device for a moving object according to the present invention, which includes a speed sensor 1 that detects the traveling speed of the moving object, and a speed sensor 1 that detects the angular velocity of a change in one direction, for example, the moving object. A rate-type direction sensor 2 outputs a signal proportional to the amount of change in direction as the vehicle travels, and the speed sensor 1 measures the travel distance of the moving object by time-integrating the travel speed detected by the speed sensor 1. The current position of the moving object on the x-y coordinates for each unit traveling distance is determined by sequential calculation while calculating the amount of change in the moving direction of the moving object by time-integrating the detected angular velocity, and the current position of the moving object is calculated. A signal processing device 3 consisting of a microcomputer that controls the entire display device, and data of the current position on the X-Y coordinates, which changes every moment as the moving body moves, determined by the signal processing device 3, are sequentially stored. , a travel trajectory storage device 4 that stores and holds finite continuous position information of a moving object, a map information storage medium 5 that stores information on a plurality of road maps in advance, and road map information from the storage medium 5. Storage media recycling bag that selectively reads out! ! 6, based on the read map information, a predetermined road map is displayed on the screen, and the current position of the mobile object is displayed on the road map displayed on the screen, and the travel trajectory and current position are displayed as necessary. a display device 7 that displays information as the moving object moves along with the moving direction of the moving object; and a signal processing device 3.
In addition to giving operation commands to the display device 7, it also selects and specifies the map to be displayed on the display device 7, sets the starting point and destination of the mobile object on the displayed map, and selectively gives commands to display the traveling trajectory, etc. , and an operating device [8] that can appropriately change the settings of the display format such as selecting the display line scale for partially enlarged display 8 of the map and the travel trajectory.

In addition, in this current position display device of a moving body, the display device 7
A mark indicating the current position of the moving object is displayed at a fixed position on the screen at The map with the same coordinates as the coordinates is scrolled.

Specifically, the scrolling of the map is such that map data for four screens is always written into the image memory of the display device 17, and from among the four screens, one screen's worth of map centered on the current location is sequentially displayed. This is done by cutting out the image and displaying it on the side.

Note that the starting point on the map can be determined by appropriately scrolling the map displayed on one screen using input operations on the operating device 8, and then matching the corresponding position on the map with the current position mark displayed in the center of the screen. Set by matching.

Similarly, a destination on a map is set by searching for a corresponding position by appropriately scrolling the map displayed on the screen and specifying the position using, for example, a cursor.

With this configuration, the map read from the map information storage medium 5 is displayed on the display ffi! 7, and the current position on the X-Y coordinates is displayed on the screen of the signal processing device [3] according to the traveling of the moving object from the starting point set on the map. is determined by calculation every moment, and the calculation results are sequentially sent to the travel trajectory storage device 4 to update the storage contents, and the storage contents are constantly read out and sent to the display device 7.

As a result, the display device 7 displays, for example, a mark Ml indicating the current position of the mobile object on the map displayed on the screen, and a mark indicating the traveling direction of the mobile object at the current position. M2 and a mark M3 indicating the travel trajectory up to the current position are displayed in a simulated manner following the travel state of the moving object.

In the current position display device of a moving body as described above, the present invention particularly provides information on the direction of the moving body as well as the direction of the destination from the current position on the screen when a destination is set on a map. In order to expand the map area, move the image to the center of the screen in a predetermined direction that follows the angle between the moving direction of the moving object at the current location and the direction of the destination as seen from the current location, and on the opposite side of the destination from the current location. A method is used to display a certain current position shifted by a predetermined amount along with the map.

The way to do that is specifically, a signal processing bag! In step 3, data processing is performed using a predetermined algorithm.

As an example of an embodiment of the means, as shown in FIG. 3, the current position I! is located at the center of the screen! A predetermined distance Q from the center of the screen to the opposite side of destination 0 on the bisector of the angle θ formed by the moving direction of the moving object at P and the direction of destination 0 as seen from the current position P. The current position is displayed at the shifted amount wP'.

Further, as another embodiment example of the means, FIG.
), in the direction of the vector product of each directional component A, B of the moving direction of the moving object at the current position SIP in the center of one screen and the direction of the destination O from the current position P,
The current position is displayed at a position P' shifted by a predetermined distance Q from the center of the screen to the side opposite to the destination ○.

The magnitudes of the vector components A and B of the moving direction of the moving object at the current position P and the direction of the destination ◯ as seen from the current position P are uniformly set in advance.

At that time, for example, as shown in FIG. 4(b), so that the map area in the moving direction of the moving object can be further expanded,
Vector component A may be set to be larger than vector component B.

In each of the embodiments described above, the screen is set in a predetermined direction according to the angle θ formed by the moving direction of the moving object at the current position @p in the center of the screen and the direction of the destination O as seen from the current position IfP, and If you want to display the current position at a position offset by a predetermined amount from the center to the opposite side of the destination ○,
Instead of uniformly offsetting by a preset distance Q in a predetermined direction as described above, it is offset by 5 as shown in FIG.
An offset positioning frame FM corresponding to the screen may be set in advance as position data, and the offset may be made to the position 11P' at the intersection of the line L following a predetermined direction and the frame FM.

Specifically, in the signal processing device 3, data on the position on the frame FM where the line L intersects is extracted based on the position data of the frame FM set on the screen.

By using an offset means using such a frame FM, it becomes possible to perform an optimal offset according to a screen having a rectangular shape.

As described above, according to the present invention, when the current position of a moving object is always displayed at a fixed position on the screen, such as the center of the screen, by scrolling the map displayed on the screen as the moving object travels, an objective is displayed on the map. When the ground is set,
By considering the direction of the destination as seen from the current position and the moving direction of the moving object at the current position, the current position is shifted by a predetermined amount along with the map in a predetermined direction according to the relative angle of each direction. It is possible to effectively expand not only the map area in the direction of the destination as seen from the vehicle, but also the map area in the direction of movement of the moving object.

Therefore, even if the direction of the destination seen from the current position and the direction of movement of the mobile object at the current position are significantly different, the map area in the direction of movement of the mobile object will not be narrowed as in the past. The system will now be able to provide optimal driving guidance on the screen with a clear view of the future.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a current position display device for a moving body according to the present invention, FIG. 2 is a diagram showing an example of a display screen in the same embodiment, and FIG. A diagram showing a state in which the current position is shifted on the bisector of the angle formed by the direction of movement and the direction of the destination seen from the current position. Figure 4 (a) and (b) show the direction of movement of the moving object at the current position. Figure 5 shows the current position shifted in the direction of the vector product of each direction component with the direction of the destination as seen from the current position. Figure 5 shows the current position shifted on the offset positioning frame set on the screen. FIGS. 6(a) and 6(b) are diagrams showing a state in which the current position is shifted in the direction of the destination as viewed from the current position.

Claims (3)

[Claims] 1. While detecting the traveling distance and direction of the moving object, the current position on the two-dimensional coordinates, which changes every moment as the moving object moves, is calculated sequentially, and the map data is read out from the storage medium in advance and displayed on the screen. The current position of the moving object is displayed on a map that has the same two-dimensional coordinates as the current position, and as the moving object moves, the map is scrolled in the direction of movement, and the fixed position is displayed on the screen. In a device for displaying the current position of a moving object, the device includes a means for setting a destination on a map, and a predetermined method according to an angle between the moving direction of the moving object at the current position and the direction of the destination as seen from the current position. In the direction of
A current position display of a moving object, characterized in that the current position of a moving object is displayed on the opposite side of the destination from the current position, with the current position at a fixed position on the screen being shifted by a predetermined amount along with the map. Device. 2. The predetermined direction according to the angle formed by the moving direction of the moving body at the current position and the direction of the destination as seen from the current position is a direction according to the bisector of the angle. A device for displaying the current position of a moving object as described. 3. Item 1 above, wherein the predetermined direction according to the angle formed by the moving direction of the moving object at the current position and the direction of the destination as seen from the current position is the direction of the vector product of the respective direction components. A device that displays the current position of a moving object.