JPS63300399A - Navigation system - Google Patents

Abstract

PURPOSE:To enable a mobile station to navigate efficiently to a destination by acquiring an identification signal sent from an object vehicle by a fixed station, reading necessary information on the object vehicle out of a map information data base, and sending it to the object vehicle. CONSTITUTION:The map information data base 15 on the side of the ground fixed station 11 is stored with map information which can be offered to the object vehicle so that map information can be corrected and additional information can be written. A work station 16 inputs additional information to the map information data base 15 and plural antennas 13a-13c receive the identification signals sent out of the object vehicle 1 in plural directions 12a-12c at the same time. A map information transmitting means 20 accesses the map information data base 15 to read out map information including the current position of the captured object vehicle 1 or map information including the path connecting two optional points determined by the current position indicated from the object vehicle and an optional destination and send it to the object vehicle 1. Consequently, the object vehicle can navigate efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automobile transportation system that provides map information to moving automobiles, and particularly relates to an automobile transportation system that provides map information to moving automobiles.
[Prior art] Figure 3 shows, for example, Nikkei Electronics, September 8, 1986.
1 is a block diagram showing a conventional navigation system shown in the Japanese version, and in the figure, 31 is a control device;
CD based on the position information transmitted from the S receiving device 32.
- Drive device 34 drives map disk 35 consisting of ROM.
The map information of the corresponding position is read out and displayed on the CRT display 36. 33 is a flat antenna that receives GPS signals (GL) transmitted from GPS satellites.
578tern signal) and outputs a GPS signal serving as position information to the GPS receiving device 32.

A speed sensor 37 constantly outputs the moving speed of the vehicle to the control device 31 while the vehicle is driving. Reference numeral 38 denotes a geomagnetic sensor, which constantly outputs information on the direction in which the vehicle is traveling to the control device 31 while the vehicle is driving.

Next, the operation will be explained.

The GPS signal received by the planar antenna 33 is decoded by the GPS receiving device 32, and the position information is transferred to the control device [31]. The control device #31 controls the drive device 34 to read out the map information stored in a predetermined area in order to read out a map image including this position information based on the device information constituted by the GPS receiving device 32. It is displayed on the CRT display 36. At this time, if desired reduction ratio information, for example 1/25000, is input through the input section (not shown), CR
The map information read out to the T display 36 is 1/250
It can be displayed as 00.

In addition, as the vehicle moves, for example, when the vehicle enters an area where radio waves are blocked or a shielded area such as a tunnel, the speed sensor 31 is used to prevent the location of the target vehicle from disappearing from the displayed map. The control device 31 accesses the map disk 35 based on the speed information and the azimuth information output from the geomagnetic sensor 38, and controls the CRT display 36 to display a map of the desired area at all times. When the system returns to an area where radio waves can be received from the above-mentioned shielded area, the navigation system is automatically switched to a map display based on GPS signals, allowing the driver to navigate to an accurate location. .

[Problem that the invention seeks to solve]

The conventional navigator system was configured as described above, making it essential to receive GPS signals, but in reality, the time during which GPS signals from satellites can be received is limited to three times a day. In addition to being limited to an extremely short period of time, it is only possible to provide the driver with map information based on the current location of the moving vehicle, and it is not possible to provide map information determined from an arbitrary destination and the current vehicle location. However, the use of map information that can be used is limited, and there are problems such as the inability to expand map information service media for the increasingly advanced automobile society.

This invention was made to solve the above-mentioned problems, and it is possible to provide map information to the target vehicle at any time, and also to provide map information that is a route connecting two points from the target vehicle to the requested destination. The purpose of the present invention is to obtain a navigation system that can follow the movement of a vehicle and provide it at all times.

[Means for solving problems]

The navigation system according to the present invention includes a work stage 1 which inputs additional information into a map information database at a fixed station, and a work stage 1 which prompts a fixed station to receive an identification signal transmitted from a target vehicle.
It has map information that reads target vehicle necessary information from the map information database and transmits it to the target vehicle.

[For production]

In the navigation system invented by Jin, a map information database is stored at a fixed station on the ground in a state that allows modification of the map information that can be provided to the target vehicle and writing of additional information. inputs additional information into the map information database, multiple antennas simultaneously receive identification signals transmitted from the target vehicle from multiple directions, and the map information transmitting means inputs additional information into the map information database based on the identification signals received by these antennas. A map information database is acquired while capturing map information including the current position of the target vehicle captured by the target vehicle, or map information including a route connecting any two points determined by the current position indicated by the target vehicle and an arbitrary destination. and send it to the target vehicle.

On the other hand, in the target vehicle, the identification signal transmitting means transmits an identification signal including position information to the fixed station, and the display means can identify the target vehicle from the map information transmitted from the map information transmitting means of the fixed station. to be displayed.

〔Example〕

This embodiment will be explained below with reference to the drawings.

In this figure, reference numeral 1 indicates a vehicle as a mobile station, a CRT display serving as a display means of the present invention, a CRT display 2, an image receiving device 3. Wireless telephone station4. Antenna selector switch5. Car locator transmitter 6 serving as identification signal transmitting means of the present invention
．． It is composed of an antenna 7, etc., and a car locator transmitter 6.
The vehicle's current location, including the map information or destination (attached information) received via the antenna 7, is transmitted to the fixed station 11 via the antenna 7, and the vehicle's current location, including the map information or destination (attached information) received via the antenna 7. The position information indicating the position is displayed on the CRT display 2 via the image receiving device 3't-. Note that the antenna T functions as a transmitting and receiving antenna for the wireless telephone station 4.

The fixed station (base station) 11 includes position measuring station devices 12a to 12.
c, receiving antennas 13a to 13c, car locator base station device 14. Map information image database 15° work stage 1 which becomes the map information database of this invention 16.
An image transmission device 17 serving as a map information transmission means of the present invention.
Antenna changeover switch 18. It is composed of a transmitting antenna 20 and the like, and transmits the identification signal of the vehicle station 1 received via the receiving antennas 13a to 13ct to the position measuring station devices 12a to 12.
In step C, the current position of the vehicle station 1 and its moving direction are captured by analysis using, for example, a three-point survey method. The car locator base station device 14 includes position measurement station devices 12a to 12a.
12c and attached information indicating the destination are sent and received, and are notified to the work stage 1 pin 16 of the fixed station 11. The work station 16 instructs access to the map information stored in the map information image database 15, and also inputs value-added information such as traffic information into the map information image database 15 so that it can be updated at any time. It consists of 1 work stage and 1 work stage.
6. When a destination is input, the target vehicle (vehicle with mobile station 1) that is at the shortest distance to the destination to which the vehicle is to be dispatched is searched for, and a map connecting the vehicle position and the destination is created. The information image database 15 is searched and marked, and the searched map information is transmitted to the target vehicle mobile station 1 via the image transmission bag fttr and the transmission antenna 20.

Next, the control operation of the navigation system 17 according to the present invention will be explained with reference to the flowchart shown in FIG.

FIG. 2 is a flowchart illustrating the navigation 7m control operation according to the present invention.
indicates each step.

An identification signal is always transmitted to the vehicle station 1, and this identification signal is transmitted to the receiving antennas 13a to 13c on the fixed station 11 side.
, and the location of mobile station 1 has been captured. Under this state, when the destination information corresponding to the destination received from the work station run 16 is input (step s'
r (t)), the work stage 1-16 accesses the marked area of the map information image database 15,
Step 5T(2)) to search for the target vehicle (mobile station 1) located at the shortest distance to the input destination;
In step ST (31), the map information image database 15 is searched for a map connecting the vehicle position and the destination, and the information is marked in the marking area. Next, the map information connecting the searched vehicle position and the destination is transmitted to the corresponding mobile station 1 via the image transmission device 17 through the transmitting antenna 20 (step S T (41). At this stage, the target vehicle ( Navigation ends when the mobile station 1) arrives at the destination, but if the vehicle position and the destination are very far apart, it may not be possible to follow up with the single map information (map image) sent. Therefore, it is determined whether the target vehicle (mobile station 1) can arrive at the destination using the single transmitted map image (step 5T(5)). If YES, it is determined that it can arrive and the navigation 71 is activated. For example, if the destination cannot be reached with one map image, or if the target vehicle (mobile station 1) requests to provide new map information, the current target vehicle (mobile station 1) To capture the position again, step ST (6)), step S
Return to T (3).

Note that the map image transmitted from the fixed station 11 is
is received by the antenna 7 of the mobile station 1, edited by the image receiving device 3 in the mobile station 1, and displayed on the CRT display 2 so that the own position or the shortest route on the ground can be distinguished from other map images, for example, by different colors or by filling out 6. It is configured so that the display including image processing such as dotted lines and the direction of movement thereof can be changed.

Further, in response to a request from the target vehicle (mobile station 1), added value information such as traffic information stored in the map information image database 15 so as to be updated at any time can be displayed on the CRT display 2.

By providing such information to the target vehicle (mobile station 1), it is possible to provide the target vehicle (mobile station 1) with accurate and real-time information, such as traffic jam information. It becomes possible to expand the selectivity of the moving route and moving direction of station 1) and to use it as more detailed information.

In the above embodiment, received information is displayed on the CRT display 16, but it may also be displayed on a receiving medium such as a facsimile. Work stage 1 for inputting additional information into the map information database at the station;
It captures the identification signal transmitted from the target vehicle, reads the target vehicle necessary information from the map information database, and has the map information to be transmitted to the target vehicle, so it can detect the identification signal transmitted from the target vehicle (mobile station) and the destination. Accurate map information, such as the current location and the shortest route to the destination, can be provided in real time, and the mobile station can be efficiently navigated to the destination. Furthermore, since a conventional car locator can be used, there is no need to develop an accessory device related to the GPS system, and high-precision navigation is possible at low cost. Furthermore, added-value information such as traffic regulation information can be stored on the database in a manner that can be updated at any time, so it has excellent advantages such as being able to provide mobile stations with the latest information that changes in real time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram explaining the configuration of a navigation system showing an embodiment of the present invention, FIG. 2 is a flowchart explaining the navigator 1 control operation according to the present invention, and FIG. 3 is a block diagram showing a conventional navigation system. It is a diagram. In the figure, 1 is a mobile station (target vehicle), 2 is a CRT display, 3 is an image receiving device, 4 is a wireless telephone station, 5 is an antenna changeover switch, 6 is a car locator transmitter, 7
is an antenna, 11 is a fixed station, 12a to 12c are position measuring station devices, 13a to 13C are receiving antennas, 14 is a car locator base station device, 15 is a map information image database,
16 is a workstation, 17 is an image transmission device, 18
is an antenna changeover switch, and 2o is a transmitting antenna. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Patent applicant: Mitsubishi Electric Corporation (2 others)

Claims (2)

[Claims] (1) In a navigation system that transmits map images between a target vehicle having a mobile station and a fixed station, the fixed station is in a state in which it is possible to modify map information that can be provided to the target vehicle and to allow writing of additional information. a workstation that inputs the additional information into the map information database; a workstation that captures an identification signal including additional information such as location information transmitted from the target vehicle; 1. A navigation system comprising: map information transmitting means for reading target vehicle necessary information from a target vehicle and transmitting the information to the target vehicle. (2) The target vehicle necessary information is map information including the current position of the target vehicle or map information including a route connecting any two points determined by the current position indicated by the target vehicle and an arbitrary destination. The first claim characterized in that
Navigation system as described in section.