JPH02210598A - Present place displaying method - Google Patents

Abstract

PURPOSE:To display the rough range of a present place and to limit the range of existence of one's own vehicle even when direction sensor data are easily disturbed and the present place is not cleared in an untrained city part where many road sin a similar shape exist by inputting the name of establishments observed from the inside of the vehicle. CONSTITUTION:An arithmetic processing unit 10 collates vector road data, which are inputted from a road data storage device 40, with the present place to be updated by a vehicle speed sensor 20 and direction sensor 30 such as a geomagnetic sensor, etc., and displays the data and present place on a picture display device 60. Further, the names of the establishments observed from the inside of the vehicle are displayed in a menu in the lower part of the picture display device 60 and a driver selects the name of the establishment. In such a way, when only the name of the establishment observed from the inside of the vehicle is inputted, the rough range of the present place can be limited. Additionally, when an address indicated by such a city name and a street num ber written on a footbridge or a telegraph pole is known, the present place can be more easily narrowed down.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an in-vehicle navigation system, and provides a method for displaying the current location, which is particularly suitable for driving in a large city with an extremely large number of roads and extremely narrow road intervals. Regarding.

[Prior Art] The conventional technology is as described in Japanese Patent Application Laid-open No. 191083/1983. In other words, by calculating the current position and current direction of the moving object on the map, and comparing the results with the map information and correcting them, it is possible to compare the travel trajectory with the map information,
We are doing what is called map matching.

[Problems to be Solved by the Invention] In the prior art described above, sensor errors accumulate under the influence of noise. Furthermore, the road shape is often simplified, and as a result, the bakutail road data also contains errors. Therefore, when driving on roads with similar shapes such as base 1"-shaped roads or bifurcated roads, there is a possibility that map matching will be performed on the wrong road, and as a result, the current location will disappear from ;1]. was there.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for determining the current location of a single-mounted navigation system that can address the above-mentioned problems.

[Means for solving the problem] The above purpose is to input the name of a facility that can be seen from inside the car (for example, gas station, hospital, police station),
This is achieved by displaying a range within a predetermined radius from the location of the facility. If there are multiple facilities, the overlap of the display sections will be the range of the current location.

[Operations] As mentioned earlier, it is unavoidable to perform incorrect map matching while driving. Therefore, in the worst case, there is a possibility that the current location may become completely unknown. However, if you enter the name of a facility that can be seen from inside the car, you can limit the general range of your current location. In addition, if you can find the address "***City**Chome" written on pedestrian bridges and telephone poles, it will be even easier to narrow down your current location.

[Example code] An embodiment of the present invention will be described below.

FIG. 1 shows an example of a system configuration. Arithmetic processing unit 10
is input from the road data storage device 4o.
- Compare the road data with the current location updated by the vehicle speed sensor 20 and the direction sensor 30 of the geomagnetic sensor shade;
Displayed on the image display device 60.

FIG. 2 is an example of a table for storing location coordinates of hospitals, temples, shrines, etc. In either case, it consists of a serial number, X coordinates, and Y coordinates (1 and 2.2 bytes in this example).

Next, the processing method will be explained using FIG.

(1) The farthest distance Q from which the facility can be seen from inside the car (for example, Q
” 200 m).

-: (~ (2) Enter the name of the facility that can be seen from inside the car. For example,
As shown in FIG. 8, a menu is displayed at the bottom of the image display device 60, and the driver selects a facility name.

(3) Since the X and Y coordinates of the facility are stored in the table in Figure 2, for the input facility name, draw a circle with the center at the location and radius Q, and compare the inside and past filled areas. Take the AND and display.

As an example, a specific example of the screen display in FIG. 8 will be explained using FIGS. 4 to 7.

FIG. 4 is an example of a road network. temples, hospitals,
Suppose that the shrine is arranged as shown in the diagram.

In Figure 5, the range of the current location when the hospital is visible is shown by hatching. And Figure 6 shows the hospital and temple.
Figure 7 shows the range of the current location when hospitals, temples, and shrines are visible by hatching. In this way, the more facility names there are, the more the current location can be narrowed down.

Note that in order to improve the processing efficiency in this patent, it is also possible to perform processing as shown in FIG. 9. this is,
This method assumes that the true current location always exists within a circle S of a predetermined radius centered on the point P in the current location P updated by the azimuth sensor and the vehicle speed sensor. As a result, it becomes possible to reduce the calculation processing time and narrow down the range of the current location.

[Effects of the Invention] According to the present invention, when the current location is unknown in an unfamiliar urban area where the direction sensor data is easily disturbed and there are many roads of similar shapes, there is an effect that it is possible to limit the range of the presence of one's own troops.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing an example of the system configuration of the present invention; Figures 2 (a) to (c) are diagrams showing examples of tables for storing the location coordinates of facilities; Figure 1 is a processing flow diagram, Figure 4 is a diagram showing an example of a road network, Figure 5 is a diagram showing the range of the current location when a hospital is visible, and Figure 6 is a diagram showing the range of the current location when the hospital and temple are visible. Figure 7 is a diagram showing the range of the current location when hospitals, temples, and shrines are visible. Figure 8 is a diagram showing an example of the display on the image display device. Figure 9 also shows the direction and vehicle speed sensor data. It is a diagram showing the range of the current location when used. [Explanation of symbols 1o Arithmetic processing unit, 20 Vehicle speed sensor, 3o... Orientation sensor, 4o... Road data storage device, 60... Image display device.

Claims (5)

[Claims] 1. A current location display method characterized by displaying the approximate current location range by inputting the name of a facility that can be seen from inside a vehicle. 2. 2. The current location display method according to claim 1, wherein a place name visible from inside the vehicle can also be input. 3. It consists of a vehicle speed sensor, a direction sensor, a road data storage device, an image display device, and an arithmetic processing device, and vector data generated by the vehicle speed sensor and the direction sensor are processed by using the arithmetic processing device. The in-vehicle navigation device that obtains the current location by comparing it with road data obtained from the road data storage device is characterized in that by inputting the name of a facility that can be seen from inside the vehicle, the approximate range of the current location is displayed on the image display device. The current location display method. 4. 4. The current location display method according to claim 3, wherein a place name visible from inside the vehicle can also be input. 5. The facility name input means selects and inputs a facility name displayed on the menu on the image display device,
The current location display method according to claim 4.