JPH08101039A - Navigation device - Google Patents

Abstract

PURPOSE: To prevent pattern matching from becoming impossible to terminate. CONSTITUTION: The navigation device acquires such information as the present location, run locus, running direction, etc., of a traveling object on a road map set in a CD-ROM 7 by means of a moving distance detector 2, azimuth detector 3, and GPS receiver 4 and displays the information on a display device 5. The navigation device modifies the present location of the traveling object and, at the same time, detects a new road by means of a self-position detecting block 9 and stores the map data regarding the new road in an updated information storing block 11. The navigation device performs pattern matching by reading out the map data from the block 11 and displays information on the display device 5 based on the map data obtained as a result of the pattern matching.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a navigation device mounted on a moving body such as an automobile for knowing the current position of the moving body.

[0002]

2. Description of the Related Art In a moving body such as a moving vehicle, a current position, a traveling locus of the vehicle,
A device for displaying information such as a traveling direction is known as a navigation device (or a navigation system), and various models are commercially available.

In this type of navigation device,
The map information data is stored in a storage medium such as a CD-ROM, and the map information (data) corresponding to the current position of the mobile body is read from this CD-ROM. Further, the navigation device includes a distance detection sensor and an azimuth sensor. The distance detection sensor detects the moving distance of the moving body, the azimuth sensor detects the traveling direction, and the current position of the moving body is calculated from those values. The position is obtained by plotting the position on a road map and displaying it on the display screen moment by moment. Alternatively, a configuration is adopted in which the current position of a moving body is received as latitude and longitude values from an artificial satellite using GPS (Global Positioning System), and these values are displayed as alphanumeric characters.

However, in the structure provided with the distance detecting sensor and the azimuth sensor, an error is caused due to the detection accuracy of these sensors, and the more the movement is accumulated, the more the error is accumulated. May fall off the road, and you may lose your current position.

Further, in the configuration using GPS, since the current position is received from the artificial satellite, the current position is received by the environment in which the moving body is placed (for example, in a tunnel, in a forest, underground, etc.). The state changes and errors due to this change are unavoidable.

In order to correct the current position error of the moving body caused by the above-mentioned causes, pattern matching between the map and the traveling locus is performed. This is when the traveling locus of the moving body displayed on the map deviates from the road, the road that matches the traveling locus is searched, the road data is compared, and the road with high similarity is selected. However, by providing the function of correcting the data so that the traveling locus is displayed on the selected road, it is possible to automatically correct the deviation of the traveling locus due to the above error. .

[0007]

However, in the above-mentioned prior art, the road map data is stored in a storage medium such as a CD-ROM in several scales. It depends on the ability of the CPU to be used, and the level of the two-lane road is currently the limit. Moreover, the version of the map data is updated once a year, but the actual road changes cannot be grasped.

For this reason, there is a large gap between the map data used for pattern matching and the actual road, an error occurs in the pattern matching itself, and the pattern matching process cannot be completed. Cannot be grasped.

It is an object of the present invention to provide a navigation device capable of preventing the pattern matching process from being unfinished.

[0010]

In order to achieve the above object, the present invention displays information such as the current position of a moving body, a traveling locus and a traveling direction on a road map which is set in advance in a storage medium. In the navigation device, map updating means for correcting the current position and detecting a new road,
A storage means for storing the map data obtained by the map update means is provided, and the map data is read from the storage means to perform pattern matching.

The map updating means stores locus data when the locus data obtained by plotting the locus of the moving body is not present in the road data near the current position read from the storage medium in the storage means. It is possible to adopt a configuration including a data collating means for storing.

Further, the storage means, if the new locus data is the same as the past locus data, and the frequency thereof is high, an update judgment means for considering the new locus data as a new road, and the update judging means. It is possible to have a configuration including update road storage means for storing road data that has been made a new road by the determination means.

Further, display processing means for displaying a road regarded as the new road on a display device can be provided.

[0014]

According to the above means, the storage means capable of storing the map data is provided, and the CD is updated by the map learning function.
A new road not stored in a storage medium such as a ROM,
The current position can be accurately recognized by additionally storing the newly created road and the like and reading it out as needed for pattern matching.

As a concrete means of the updating process, the CD of the trajectory data obtained by tracing the trajectory of the moving body such as a vehicle is compared with the CD.
-When there is no portion corresponding to road data in a storage medium such as a ROM, the locus data is stored and saved so that it can be used as new road data. As a result, CD-
Road data that is not stored in a storage medium such as a ROM can be newly generated and can be used as pattern matching information.

The locus data obtained in this way is compared with the locus data stored in the past, and if the contents are in agreement, the frequency is determined. The data is stored and saved as new road data. By giving the learning function in this way, the CD
Roads that are not stored in a storage medium such as a ROM can be targeted for pattern matching.

The new road data obtained in this way is recorded on a CD
-If the map is displayed on the display device together with the map obtained from the storage medium such as the ROM, the latest map can be displayed without replacing the storage medium such as the CD-ROM.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the overall configuration of a navigation device according to the present invention. FIG. 2 is a block diagram showing a detailed configuration of main blocks in the configuration shown in FIG.

As shown in FIG. 1, the navigation apparatus according to the present invention is mainly composed of a main body 1 having a plurality of processing blocks. The main body 1 has an input unit at which a moving distance detector 2 and an azimuth detector are provided. Each of the device 3 and the GPS receiver 4 is connected. Further, the main body 1 includes a display device 5 and a CD.
A ROM reading device 6 is connected. This CD-RO
The M-reading device 6 is detachably loaded with a CD-ROM 7 (storage medium) in which digitized map data is stored.

The moving distance detector 2 outputs a pulse signal proportional to the number of revolutions of the tire of the automobile. A rate type is used for the azimuth detector 3, for example, an angular velocity in the yaw direction is detected and a signal proportional to the traveling direction of the moving body is output according to the traveling direction of the moving body. Further, the main body 1 is configured to include a signal processing block 8, a self-position detection block 9 (map updating means), a display processing block 10 (display processing means), and an update information storage block 11 (storage means). ing.

Next, the operation of the navigation device having the above configuration will be described.

The current position is calculated by the signal processing block 8 based on the output signals of the moving distance detector 2 and the azimuth detector 3. This calculation result, the contents received by the GPS receiver 4,
Also, by referring to each of the road data read from the CD-ROM reading device 6, the self-position detecting block 9 corrects the current position and detects a new road. The detected new road is stored in the update information storage block 11. In the display processing block 10, the map data is read from the CD-ROM reading device 6 and displayed on the display device 5.
The display content is corrected using the correction data of the self-position detection block 9 and the detected new road.

Next, the configuration of FIG. 2 will be described. The self-position detection block 9 includes a locus data storage unit 12, a verification road data storage unit 13, a road data verification unit 14 (data verification unit), a road search unit 15, a similarity calculation unit 16, and a road selection unit 17. It is configured with. The update information storage block 11 includes an update determination unit 18 (update determination unit), a past trajectory data storage unit 19, and an updated road storage unit 20 (updated road storage unit). A semiconductor memory, a floppy disk, a hard disk, or the like can be used for each storage unit.

The locus data storage unit 12 plots the locus of the moving body based on the current position data obtained in the signal processing block 8, and the verification road data storage unit 13 stores the CD-R.
Road data near the current position is read from the OM reading device 6 and stored. The road data matching unit 14 executes matching between the trajectory data and the road data. If the road that matches the trajectory data is not actually on the map, the trajectory data is transferred to the update information storage block 11. The similarity calculation unit 16, the similarity calculation unit 16 and the road selection unit 17 are used to perform pattern matching.

On the update information storage block 11 side, the update determination unit 18 checks whether or not the past trajectory and the trajectory pattern stored in the past trajectory data storage unit 19 are the same, and further, , Also check the frequency. If the frequency is high, the locus data is regarded as a new road and is stored in the updated road storage unit 20. When the updated road is stored in the updated road storage unit 20, the road data is treated as a pattern matching target like the road data read from the CD-ROM reading device 6.
The road data of the updated road storage unit 20 is displayed on the map.

[0027]

As described above, according to the present invention, the current position is corrected in the navigation device for displaying the information such as the current position of the moving body, the traveling locus and the traveling direction on the road map set in advance in the storage medium. In addition, a map updating means for detecting a new road and a storage means for storing the map data obtained by this map updating means are provided, and the map data is read from this storage means to perform pattern matching. It becomes possible to accurately recognize the current position.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of a navigation device according to the present invention.

FIG. 2 is a block diagram showing a detailed configuration of main blocks in the configuration shown in FIG.

[Explanation of symbols]

 2 Moving distance detector 3 Direction detector 4 GPS receiver 5 Display device 6 CD-ROM reading device 7 CD-ROM 8 Signal processing block 9 Self-position detection block 10 Display processing block 11 Update information storage block 14 Road data matching unit 18 Update determination unit 19 Past locus data storage unit 20 Update road storage unit

Claims (4)

[Claims] 1. A navigation device for displaying information such as a current position of a moving body, a traveling locus, and a traveling direction on a road map set in a storage medium in advance, and a map for correcting the current position and detecting a new road. A navigation device comprising update means and storage means for storing the map data obtained by the map update means, and reading the map data from the storage means for pattern matching. 2. The map updating means stores the locus data when the locus data obtained by plotting the locus of the moving body is not present in the road data near the current position read from the storage medium. 2. The navigation device according to claim 1, further comprising a data collating means to be stored in the means. 3. The update determining means, wherein the storage means regards the new trajectory data as a new road when the new trajectory data is the same as the past trajectory data and the frequency is high, and the updating means. The navigation device according to claim 1, further comprising: an updated road storage unit that stores road data that has been changed to a new road by the determination unit. 4. The navigation device according to claim 3, further comprising display processing means for displaying a road regarded as the new road on a display device.