JPH02130412A - Current position display device for moving object - Google Patents

Abstract

PURPOSE:To provide optimum guidance information according to a running condition of a moving object by varying a degree of detail of a map projected onto a screen properly according to a running speed of the moving object or the type of a road -- whether a road on which the moving object is running is an express way or an ordinary road. CONSTITUTION:A speed sensor 9 is provided to detect a running speed of a moving object while a road network and display elements such as character and mark information on a map in regions per screen are sorted beforehand according to a degree of detail of the map to be stored into a map information memory medium 5 separately. Then, with a signal processor, the reading of the display elements on the map in the same region from the map information memory medium 5 is controlled according to the running speed of the moving object detected with the speed sensor 9 to vary the degree of the map in the same region as displayed on the screen.

Description

[Detailed Description of the Invention] The present invention is a method for displaying the current position of a moving object, in which the current position of the moving object is updated and displayed on a map displayed on one screen as the moving object moves while determining the position of the moving object. Regarding equipment.

Recently, systems have been installed on mobile bodies such as cars, and while determining the position of own troops, the current position of the mobile body is displayed on a road map that has been projected on the screen in advance, updating it sequentially as the vehicle travels. A device for displaying the current position of a moving object for navigation has been developed.

Conventionally, such current position display devices for moving objects compactly display map information consisting of patterns such as road networks and railway lines, characters such as place names and intersection names, and symbol marks of temples and schools on the same plane. The map is stored in a storage medium such as a disk, and a map whose display contents are fixed according to map information read from the storage medium is displayed on the screen.

However, the map displayed on one screen contains a lot of road networks, various text information, mark information, etc., but for example, when driving at high speed on an expressway or major arterial road, the map is too detailed. Not only is the information unnecessary, but it may even become an eyesore.

1. The present invention has been made in consideration of the above points, and the details of the map displayed on the screen can be adjusted according to the traveling speed of the moving object or the type of road, such as whether the road on which it is currently traveling is an expressway or a general road. An object of the present invention is to provide a current position display device for a moving object that changes the degree as appropriate.

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

FIG. 1 shows an example of the configuration of a current position display device for a moving object according to the present invention, and its basic configuration includes a distance sensor 1 that outputs a pulse signal for each unit travel distance of the moving object.
and a rate-type direction sensor 2 that detects the angular velocity of the moving object in one direction and outputs a signal proportional to the amount of direction change as the moving object moves, and counts the number of pulse signals from the distance sensor 1. In addition to measuring the traveling distance of the automobile, the traveling direction of the moving object is determined according to the output signal of the direction sensor 2, and
A signal processing device 3 consisting of a microcomputer or the like that determines the position on the dimensional coordinates by sequential calculations and centrally controls the entire system, and a signal processing device 3 that changes every moment as the moving body moves, determined by the signal processing device 3.
A travel trajectory storage device 4 that sequentially stores position data on dimensional coordinates and holds it as finite continuous position information corresponding to the current position of the moving body, and a map in which map information for each of a plurality of regions is stored in advance. An information storage medium 5 and a storage medium recycling bag 5 for selectively reading out necessary map information from the storage medium 5! i6 and the map surface image is projected on the screen according to the read map information, and the current position of the moving body is displayed on the projected map based on the position data stored in the traveling trajectory storage device I4. It gives operation commands to the display device 7 that updates and displays the travel trajectory and current direction of travel as necessary, and the signal processing device 3, and also specifies the selection of the map to be displayed on the display device 7 and the displayed information. Sets the starting point of the moving object on the map, displays the traveling trajectory of the moving object, changes the direction of the displayed map and traveling trajectory, shifts the display position, and displays 2 enlarged parts of the map and the traveling trajectory. It is constituted by an operating device it8 that can appropriately change display format settings such as selection of line scale ratio.

Map information includes patterns such as road networks and railway lines,
It consists of characters such as place names and intersection names, and symbol marks of temples, schools, etc.

With this configuration, as shown in Figure 2,
The selectively read map is displayed on the screen of the display device 7, and the map is displayed according to the map scale rate preset by the signal processing device E3 according to the vehicle travel from the starting point set on the map. A display mark Ml indicating the current position of the car on the x-y map, a display mark M2 indicating the direction of travel of the car at the current position, and a mark M indicating the travel trajectory from the starting point S to the current position.
3 is displayed in a simulated manner following the driving state of the car.

In such a device for displaying the current position of a moving object, particularly in the present invention, a speed sensor 9 is provided to detect the traveling speed of the moving object, and the road network on the map of each area for one screen is Display elements such as two characters and mark information are classified according to the level of detail of the map and stored separately in the map information storage medium 5, and the signal processing device i! 3, by controlling the reading of display elements of a map in the same area from the map information storage medium 5 according to the traveling speed of the moving body detected by the speed sensor 9,
The level of detail of the map displayed on the screen for the same area is changed.

That is, as map information, the level of detail of a map in the same area is, for example, at the town name level or city name level.

The map information is classified into three levels at the prefecture name level, and the map information for each level of detail is separately stored in the map information storage medium 5, so that the traveling speed of the moving object detected by the speed sensor 9 is in the low speed range. In some cases, it reads out map information at the town name level and displays a highly detailed map on the screen.
When the traveling speed of the moving object detected by the speed sensor 9 is in the medium speed range, the map information at the city name level is read out and a map with a normal level of detail is displayed on the screen, and the speed sensor 9
When the traveling speed of the moving body detected by is in a high speed range, map information at the prefecture name level is read out and a less detailed map is displayed on the screen.

In this case, instead of separately storing map information for each level of detail in the map information storage medium 5, the map information for each region is stored, for example, information on road networks, road names, intersection names, etc. Information on roads, information on landmarks such as temples and schools, etc. are stored in file units in the map information storage medium 5, and each file information is stored as appropriate depending on the level of detail depending on the traveling speed of the moving object. The details of the map displayed on the screen may be changed by reading out and superimposing them.

Furthermore, as road network information, when the degree of detail is low, information on only major roads can be obtained, and as the degree of detail increases, information including roads other than the main roads can also be obtained.

It goes without saying that the speed sensor 9 may be determined by counting the number of pulse signals sent from the distance sensor 1 per unit time in the signal processing device 3 without separately providing the speed sensor 9.

Furthermore, the present invention not only changes the level of detail of the map according to the traveling speed of the moving object, but also changes the detail of the map according to the type of road, such as whether the road the moving object is currently traveling on is an expressway or a general road. I am trying to change the degree.

In this case, the map information storage medium 5 stores in advance the type information of each road on the map, such as general roads, major arterial roads, expressways, and automobile-only roads, along with the map information, and the signal processing device 3 The system recognizes the type of road on which the current position of the mobile object is displayed from the position data of each road on the map displayed on the screen, and then uses the same method as in the previous case according to the recognized road type. By controlling the reading of display elements of a map in the same area from the map information storage medium 5, the degree of detail of the map in the same area displayed on the screen is changed.

That is, for example, when it is recognized that the moving object is currently traveling on an expressway or a motorway, a map with a low level of detail is displayed on the screen.

When the moving object is recognized as traveling on a major highway, a map with a normal level of detail is displayed on the screen, and when the moving object is recognized as driving on a road in an urban area, a map with a higher level of detail is displayed on the screen. to be displayed on the screen.

As described above, the current position display device of a moving object according to the present invention displays images on one screen according to the traveling speed of the moving object or the type of road such as whether the road on which the moving object is currently traveling is an expressway or a general road. The level of detail of the map displayed on the screen can be changed as appropriate.
It has the excellent advantage of being able to provide optimal guidance information according to the traveling conditions of the moving body.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a current position display device for a moving body according to the present invention, and FIG. 2 is a diagram showing an example of display contents in the same embodiment. 1...Distance sensor 2...Direction sensor 3...Signal processing device 4...Travel trajectory storage device 5...Map information storage medium 6...Storage medium reproducing device! ! 7...Display device 8...Operation device 9...Speed sensor

Claims (2)

[Claims] 1. A mobile object that updates and displays its current position, which changes every moment as the mobile object moves, on a map displayed on a screen according to map information read out in advance from a map information storage medium while determining the position of the mobile object. In the current position display device, the road network on the map displayed on the screen,
Display elements such as characters and mark information are classified according to the level of detail of the map and stored separately in a map information storage medium, and a map of the same area is retrieved from the map information storage medium according to the traveling speed of the moving object. 1. A current position display device for a mobile object, characterized in that the degree of detail of a map in the same region displayed on a screen is changed by controlling readout of display elements. 2. A mobile object that updates and displays its current position, which changes every moment as the mobile object moves, on a map displayed on a screen according to map information read out in advance from a map information storage medium while determining the position of the mobile object. In the current position display device, the road network on the map displayed on the screen,
Display elements such as characters and mark information are classified according to the level of detail of the map and stored separately in a map information storage medium, and information indicating the type of each road is stored in the map information storage medium, By recognizing the type of road on which the current position of the moving object is displayed and controlling the reading of display elements of a map in the same area from the map information storage medium according to the recognized type of road. A current position display device for a mobile object, characterized in that the degree of detail of a map in the same area displayed on a screen is changed.