JPH0227217A - Navigator with road correcting function - Google Patents

Abstract

PURPOSE:To enable a display to match an actual road by a handy means by judging whether a peripheral road data of the current position read out of a map data coincides with a correction road data read in a semiconductor memory. CONSTITUTION:An arithmetic processing section 5 reads a peripheral road data of the current position out of a CD-ROM 6 to be sent to display device 7 following a data conversion. A moving speed and an ongoing bearing of a vehicle are supplied to the arithmetic processing section 5 from a vehicle sensor 1 and a bearing sensor 2. The arithmetic processing section 5 determines the current position of the vehicle from the data obtained and displays it superimposed with a road displayed on a display device 7. When the peripheral road data of the current position read out of the CD-ROM 6 differs from an actual road, for example, correction information of a road is written into a semiconductor memory 4 from a scan switch 3. The arithmetic processing section 5 judges whether an area of a data for correction read out from a memory 4 coincides with that of the peripheral road data of the current position to project correct road information to the display device 7 by a correction processing of a road data.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a navigator with a road correction function, and in particular to a navigation system that provides current position information of a vehicle such as a car. This invention relates to a navigator with a road correction function that can be corrected and displayed.

(Prior art) In conventional navigation systems that display current location information of vehicles such as automobiles, road data is stored on a CD-ROM.
A method is used in which the data is read out from the computer, reproduced, and displayed.

As a conventional example of this type of system, for example,
There is a navigator disclosed in Japanese Patent No. -226777. This publication discloses a device that reads map data from a compact disc and displays it on a map display device.

(Problems to be Solved by the Invention) In the above-mentioned conventional technology, there is a problem in that no consideration is given to the display when changing roads, and the display does not match the actual road.

In addition, in order to display correct road information at all times, a compact disc containing changed road information must be purchased each time the road is changed, which is uneconomical.

SUMMARY OF THE INVENTION An object of the present invention is to provide a navigation system that solves the shortcomings of the prior art described above and that can always provide a display that is consistent with the actual road using simple means.

(First Step for Solving the Problems) In order to achieve the above object, the present invention, as shown in FIG. a means 11 for reading road data; a corrected road data storage means 12; a means 13 for reading correction data stored in the corrected road data storage means 12; and an area for the road data around the current position and the correction data. Means 1 to determine whether they match
4, and a means 15 for correcting the road data around the position (1) when it is determined that they match.

Another feature is that a map number coincidence judgment means 17 is provided in place of the area coincidence judgment means 14 and the road data correction means 15.

(Operation) In the present invention, whether the areas of the road data around the current position read by the road data reading means 11 around the current position and the corrected road data read by the previous 3e corrected road data reading means 13 match or not. If they match, the road data correction means 15 corrects the road data.

As a result, the corrected road data is supplied to the road display processing means 16, and correct road display is performed.

Further, when the map number matching determination means 17 determines that the map numbers match, the modified road data read by the modified road data reading means 13 is transferred to the road display processing means 16.
Correct road display can be performed by supplying the information to

(Example) Below, one example of the present invention will be described in detail using the drawings.

FIG. 2 is a block diagram showing an embodiment of the navigation system according to the present invention. In the figure, 1 is a vehicle speed sensor, 2 is a direction sensor, 3 is an operation switch, 4 is a semiconductor memory in which correction data, etc., which will be described later, is stored, 5 is an arithmetic processing unit, 6 is a CD-ROM in which road data is stored, 7 is a road map display device.

Next, the operation of this embodiment will be explained. The arithmetic processing unit 5 reads road data around the current position from the CD-ROM 6. The read road data is converted by the 1* calculation processing unit 5 so that it can be displayed on the display device 7, and then sent to the display device 7. As a result, the road is displayed on the display device 7.

The vehicle speed sensor 1 outputs a pulse according to the vehicle speed, and this pulse is supplied to the arithmetic processing section 5. The arithmetic processing unit 5 detects the moving speed of the vehicle from the pulse frequency. On the other hand, the direction sensor 2 detects the direction of travel of the vehicle and supplies the detected direction to the arithmetic processing section 5 .

The arithmetic processing unit 5 determines the current position of the vehicle from the supplied heading direction and moving speed, and sends the current position information to the display device 7. As a result, the current position is displayed superimposed on the road on the display device 7.

Next, the operation of this embodiment when the road data stored in the CD-ROM differs from the actual road will be explained.

Figure 3 shows an example of such a case, where (a) shows the road shape when the CD-ROM was created, and (b) shows the road shape when the CD-ROM was created.
indicates the current road shape. FIG. 3 shows that the road shape between nodes 301 and 302 in FIG. 3(a) has been changed to the road shape shown in FIG. 3(b).

In this embodiment, when the road shape at the time the CD-ROM was created differs from the current road shape, road correction information is written into the semiconductor memory 4 from the operation switch 3, for example. In the case of the example shown in FIG. 3, the modified road data shown in FIG. 3(b) is written into the conductor memory 4.

Next, an example of the operation of the arithmetic processing section 5 will be explained with reference to the flowchart of FIG.

First, a process of reading road data around the current location is performed (step Sl). Next, the semiconductor memory 4 is accessed and the correction data is read (step S2). Next, the area of the road data around the current position read from the CD-ROM 6 in step S1 and the step S
2, it is determined whether the area of the correction data read from the semiconductor memory 4 matches the area (step S).
3).

For example, in the case of the road data shown in FIG. 3, whether or not the areas match is determined based on whether the nodes match.

In this example, nodes 301 and 302 match, so
The process in step S3 is YES, and the process proceeds to step S4.
Proceed to.

In step S4, the road data read from the CD-ROM 6 is corrected with the correction data, that is, the road data is replaced with the correction data. Next, the process proceeds to step S5, where it is determined whether the modified data is finished, in other words, whether the modification of the road data is completed.

In the case of FIG. 3, if the road data from node 301 to node 302 is corrected, the answer to step S5 becomes YES.

When the road data has been corrected as described above, road display processing is performed (step S6).

The information after the road display processing is sent to the display device 7 and displayed.

As described above, according to this embodiment, only the modified portion of the road data is stored in the writable and erasable semiconductor memory 4, so that accurate road information is always displayed on the display device with simple operation. It can be displayed on 7.

In this embodiment, the match or mismatch between the areas of the road data around the current location and the correction data is determined based on the match or mismatch of the nodes, but the present invention is not limited to this, and the match between the latitude and longitude of the map is determined. The judgment may be made based on the discrepancy. Alternatively, the determination may be made based on the map number.

An example of the operation of the arithmetic processing section 5 when modifying the road data using the map number will be explained with reference to the flowchart of FIG.

The arithmetic processing unit 5 first calculates the map number including the current location, and
It is determined whether the number matches one of the correction maps stored in the semiconductor memory 4 (step 5).
11). If there is a mismatch, the process proceeds to step SL2, where it is determined whether the number of the map including the current position has been compared with all the numbers of the correction map stored in the semiconductor memory 4, and if no If there is, step Sll again
Returning to , comparison is made with other numbers of the correction map stored in the semiconductor memory 4.

As a result of the comparison, if there is a matching map number (YES in step Sll), the road data of the map number is read from the semiconductor memory 4 into the arithmetic processing unit 5 (step 513). On the other hand, if there is no map number that is the same as the map number including the current location in the semiconductor memory 4 (YES in step S12), the process advances to step S14, and the CD-ROM 6
Road data is read from.

The eL calculation processing unit 5 performs road display processing to convert the read data into a form suitable for display (step 515).
, and sent to the display device 7. As a result, the display device 7 displays a road in which the road data has been corrected in accordance with the road change.

In addition, in the above embodiment, the correction road data is written in step 2.
ati! Although a semiconductor memory is used as the medium, the present invention is not limited to semiconductor memory, and any other storage medium that can be easily written and erased may be used. For example, magnetic tape, bubble memory, etc. may be used.

FIG. 1 shows the functional program 0.0 of the arithmetic processing section 5. This is a diagram.

However, the corrected road data storage means 12 in the figure corresponds to the semiconductor memory 4. The explanation of FIG. 1 is omitted since it has been made in the sections (Means for Solving the Problems) and (Operations).

(Effects of the Invention) According to the present invention, road data associated with road changes can be corrected by simple means and operations, so road display that resembles the actual road is always possible, and is better than conventional navigators. A navigator with significantly superior functionality can be provided.

Furthermore, it is not necessary to replace the CD-ROM storing the road data every time there is a change in the road, so there is an advantage that it is economical for the user.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram showing the functions of the present invention, FIG. 2 is a block diagram showing the I/D configuration of an embodiment of the present invention, FIG. 3 is a diagram showing an example of road shape, and FIG. FIG. 2 is a flowchart illustrating one embodiment of the processing procedure of the arithmetic processing unit, and FIG. 5 is a flowchart illustrating another embodiment of the processing means. DESCRIPTION OF SYMBOLS 1...Vehicle speed sensor, 2...Azimuth sensor, 3...Operation switch, 4...Semiconductor memory, 5...Arithmetic processing unit, 6...CD-ROM, ? ...display device agent
Patent Attorney Michito Hiraki 12 Figure 3 (a) (b) Figure 3

Claims (2)

[Claims] (1) means for reading road data around the current position from among the map data stored in the map data storage means; a corrected road data storage means; and a means for reading correction data stored in the corrected road data storage means. , comprising means for determining whether the area of the road data around the current position and the area of the correction data match, and means for correcting the road data around the current position with the correction data when they match; When the area match determining means determines that the area matches, the modified road data is selected, and when it is determined that the area match does not match, the road data around the current location read from the map data storage means is selected. A navigator with road correction function. (2) means for reading road data around the current location from map data stored in the map data storage means, modified road data storage means, and means for reading modification data stored in the modified road data storage means; , means for determining whether the read map number of the road data around the current position matches the map number of the corrected road data stored in the corrected road data storage means; A navigator with a road correction function, characterized in that the read corrected road data is selected, and when there is a discrepancy, the road data surrounding the current position read from the map data storage means is selected.