JPH03292599A - System for detecting moving body position - Google Patents

Abstract

PURPOSE:To improve an environmental resistance property by making a memory store positional information, reading and displaying the positional information automatically several times corresponding to necessity by radio data communication by an electric wave from a tags buried in a road when a vehicle passes through the neighborhood of the tag. CONSTITUTION:Four tags 1 in which positional information is written are buried in a road 01 at respective intersections 03. When it is considered to go from a point A to a point C now, the map information of the whole place involving a route from the point A to the point C is inputted to a host computer in advance and a map is displayed in a vehicle by a display. When an automobile 02 passes through the point A where the tag 1 is buried, display to represent that it has passed through is lighted at the point A on the map by the positional information of the tag 1 of the point A. When it passes through the point B and a point C, the passed points are displayed on the map in the same way and the automobile 02 can arrive at a destination while confirming its position. Thus, the environmental resistance property can be improved without the degradation of the performance owing to dirt, weather and so on.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a system in which a moving object such as a vehicle traveling on a road detects its position on a map. Note that in the following figures, the same reference numerals indicate the same or corresponding parts.

[Conventional technology]

A well-known system for obtaining this type of location information is a system in which signs such as barcodes are drawn on the road, and vehicles passing by optically read the code (location data) that the sign means. ing.

[Problem to be solved by the invention]

However, since the above-mentioned system uses an optical position detection method, it may become difficult to read when the code drawn on the road is dirty or erased, or in the rain, and the reading device may There was a problem with poor environmental resistance, such as difficulty in reading even if the lens became dirty. Another problem is that data can only be read once, making it less reliable. Therefore, it is an object of the present invention to provide a moving body position detection system that can solve the above-mentioned problems.

[Means to solve the problem]

In order to solve the above-mentioned problems, the system of the present invention has the following features: rA mobile object (such as a car 02) traveling on a road (such as 01) in which a tag (such as 1) is embedded at least at each important point can communicate with the tag wirelessly. A system that detects its own position on a map by communicating with the mobile object, wherein the tag transmits position information (An, Bn, etc.) indicating its own position on the map in response to a call from the mobile object. means for transmitting at a signal strength receivable only to the mobile object within the area on the map corresponding to the position;
Memory 2. CPU13. Transmitter/receiver 3° Transmitting antenna 4.
The mobile object is equipped with a means (host computer 11, wireless data communication device, 6 digital circuit 1
0. Transmitter/receiver9. (receiving antenna 7, transmitting antenna 8, etc.) and a map, and the location obtained from the location information transmitted from the tag in response to the call,
and means (host computer 111 display device 12, etc.) for displaying at the corresponding position on the map to be displayed.
shall be taken as a thing.

[For use]

By storing location information in memory and transmitting wireless data using radio waves from the tag embedded in the road, when a vehicle passes near the tag, the location information is automatically read and displayed (several times as necessary). Make it.

【Example】

The present invention will be described in detail below with reference to FIGS. 1 to 6. In this embodiment, a system will be described in which the present system is installed in a car to receive location information services. FIG. 1 shows an example of the configuration of this system. This system uses tag 1. Wireless data communication device6. It consists of a host computer 12 and a display device 12. Tag 1 has CPU13. Memory element 2. Transmitter/receiver 3. Transmitting antenna 4. and a receiving antenna 5. The wireless data communication device 6 also includes a receiving antenna 7, a transmitting antenna 8. It is equipped with a transceiver 9 and a digital circuit 10, and can communicate with a host computer 11. As an example, a tag 1 is buried on a road 01 at an arbitrary location as shown in FIG. 2, and the tag 1 is stored in advance with positional information of that location. Cars are wireless data communication devices6. It is equipped with a host computer 11 and a display bag W12. The transmitting antenna 8 of the wireless data communication device 6 is constantly transmitting a calling signal to the tag 1, and is waiting for the tag 1 to enter the communication area. When the car passes the place where the tag 1 is buried, the tag 1 enters the communication area, so the tag 1 receives and receives the interrogation signal from the wireless data communication device 6 from its own receiving antenna 5, and transmits it to its internal transceiver. 3 to demodulate data, send this to its own CPU 13, and retrieve position information from its own memory 2. This position information is again modulated by the transmitter/receiver 3 via the CPU 13 and sent from the transmitting antenna 4 to the receiving antenna 7 of the wireless data communication device 6. FIG. 3 shows the structure of the data transmitted by tag 1. That is, this tag transmission data 3o has a start code 31. Data section 32. Focus error check (BCC) data 33,
It consists of a stop code 34, and the data section 32 stores position information consisting of coordinates (An, Bn) on the map where this tag is located. Note that this coordinate (An. Bn) is equal to the coordinate on the map data of FIG. 5, which will be described later. Now, as described above, the positional information received from the tag 1 by the wireless data communication device 6 is demodulated into data by the transceiver 9 of the device 6, and transmitted to the host computer 11 as a digital signal by the digital circuit 1o. Here, the bit error (BCC) of the received data is checked, and if there is an error, the wireless data communication device 6 sends an interrogation signal to the tag 1 again and receives data from the tag 1. Here, the BCC check is performed again, and the above-mentioned operations after the call to tag I are repeated. While the error continues like this, the above operation is repeated a predetermined number of times N, and then a message to that effect is displayed. FIG. 4 shows signal processing means of the host computer 11 via the wireless data communication device 6 and the display device 12,
The above-mentioned processing after calling out to tag 1 is shown in steps Sl- and S7 in the figure. When the tag transmission data 30 is correctly received in this way (FIG. 4, step S4. Branch Y), the data 30
The position information (An, Bn) inside is extracted (Fig. 4,
Step S8). By the way, map information as shown in FIG. 5 has been input into the host computer 11 in advance, and the above-mentioned position information received from the tag 1 is compared with this map information. In addition, A1 to AN in Fig. 5 are the horizontal coordinates of the map,
Similarly, 81 to BN are the ordinates, and for example, the position of the diagonally shaded portion in the figure is indicated by (A3.S3). As described above, the coordinate values (AN, BN) on this map correspond to the position information (An, Bn) received from the tag 1. In this way, the computer 11 displays the location on the map (that is, the current location of the vehicle) corresponding to the location information An, Bn received from the tag 1 as shown in the shaded area in FIG. 5 via the display device 12. (FIG. 4, Step 39). Next, a specific example of how to reach a destination using this system will be explained using the map shown in FIG. As shown in the figure, at each intersection 03, four tags 1 with location information written are buried in the road 01. Now, think about going from point A to point 0. One yen map information including the route from point A to point 0 is input into the host computer in advance, and the map is displayed inside the vehicle by the display device 12. When the car 2 passes point A where the tag 1 is filled in, a display indicating that it has passed through point A on the map is lit based on the position information of the tag 1 at point A. Similarly, point B. When the vehicle 02 passes the 0 point, the passed point is displayed on the map, and the vehicle 02 can arrive at its destination while checking its own position.

【Effect of the invention】

According to the present invention, a moving body (such as a car 02) traveling on a road 01 in which a tag 1 is embedded at least at each important point communicates wirelessly with the tag to detect its own map. The tag 1, in response to a call from the mobile object 02, transmits position information (An. Bn) indicating its own position on a map on a map corresponding to the position. memory 2. as means for transmitting at a signal strength receivable only to the mobile object 02 within the area of 2. CPU13. Transmitter/receiver 3° Transmitting antenna 4. The mobile object 02 is equipped with a receiving antenna 5, etc., and is equipped with a host computer 11, a wireless Data communication device 6
Digital circuit 10. Transmitter/receiver9. (receiving antenna 7, transmitting antenna 8, etc.) and a map, and the position (An, B'n) obtained from the position information transmitted from the tag 1 in response to the call is displayed on the displayed map. The present invention is equipped with a host computer 119 and a display device 12 as a means for displaying information at the corresponding position, so it is possible to realize a position detection system with excellent environmental resistance and whose performance does not deteriorate due to dirt or weather. can. Furthermore,
This makes it possible for the increasing number of vehicles to reach their destinations in an appropriate manner, which is effective in alleviating traffic congestion and saving energy. On the other hand, although such systems are more expensive than current systems, they can increase added value by providing other information in addition to location information, so the price of location information can be reduced. can be lowered.

[Brief explanation of drawings]

Fig. 1 is a system configuration diagram as an embodiment of the present invention, Fig. 2 is a diagram showing the tag embedded in the road surface, Fig. 3 is a configuration diagram of tag transmission data, and Fig. 4 is a diagram showing the configuration of tag transmission data. Similarly, FIG. 5 is a flowchart showing the communication processing procedure for tags, FIG. 5 is a configuration diagram of map data, and FIG. 6 is a map for explaining the method of reaching a destination based on the present invention. 01: Road (surface), 02: Car, 03: Intersection, 1:
tag, 2: memory, 3, 9: transceiver, 4.8: transmitting antenna, 5, 7: receiving antenna, 6: wireless data communication device, 10: digital circuit, 11: host computer,
12: Display device, 13: CPU, 30: Tag transmission data, (A n + B n ): Position information. Dan Q, Kugu Sending Take Figure 3 Figure 4 Figure 1'' each

Claims (1)

[Claims] 1) A system in which a mobile object traveling on a road in which tags are embedded at least at key points communicates with the tags wirelessly to detect its own position on a map, wherein the tags means for transmitting location information indicating the location of the mobile object on the map at a signal strength that is receivable only to the mobile object within the area on the map corresponding to the position, in response to a call from the mobile object; means for making said appeal with a signal strength receivable only by said tag within an area on the map corresponding to the current location; A mobile object position detection system comprising means for displaying a position obtained from position information at a corresponding position on the displayed map.