JPS6310300A - Navigation system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a navigation system that shows which road on a road marked on a map the vehicle is traveling on and where it is currently located.

[Conventional technology]

Regarding navigation systems, various proposals have been made9, including Japanese Patent Publication No. 60-57069.
The publication shows a method using a geomagnetic sensor, and the magazine "Sensor Technology 4 April 1985 issue, page 43, shows a method using a gas gyro.
QP using satellites on pages 6 and 48
S (Global Positioning System
em) etc. have been done.

[Problem that the invention seeks to solve]

Each of these methods has its own merits, but
It also has shortcomings. For example, geomagnetic sensors can be manufactured at low cost, but they have poor accuracy and are susceptible to external disturbances. , the magnetic sensor is disturbed and cannot perform accurate measurements.

Additionally, gas gyros have the disadvantage of temperature drift, which causes them to gradually drift and deviate from the correct position while driving.

The method using GPS determines the current position by receiving signals from three or more artificial satellites, and is relatively accurate and good. Not only does it have the drawback of not being able to calculate the current position because it cannot receive radio waves, but it is also expensive because dozens of satellites must be placed in orbit.

Furthermore, there is no technically perfect navigation system among the currently proposed navigation systems, and the reality is that drivers rely on their experience and road maps to navigate to their destinations by feeling. be.

This invention was made in order to solve such problems, and it provides a navigation system that can accurately know the location on the road and the current location written on the map.
The purpose is to obtain.

Means for Solving Problem C] The navigation system according to the present invention includes an identification code body that has built-in road position information and is installed near the road and has a plurality of code information, and an identification code body that is mounted on a mobile object and is moved. It is equipped with an identification reader that reads the information from the identification code while the body is moving and compares it with information pre-coded in the map information to indicate the road name, route from the current location, or direction to the destination. be.

[For production]

In this invention, when a moving object approaches an identification code,
The information on the identification code is read in a non-contact manner, and the location where the information on the identification code is stored in advance is searched and displayed on a road map.

〔Example〕

Embodiments of the navigation system of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of one embodiment. In FIG. 1, numeral 1 is an identification code body consisting of a coupler 2 and resonators 3a, 3b, . connected in parallel.

On the other hand, 4 is an identification reader, and a sweep frequency generating bag f5
, a sweep frequency level detector 6, a coupler 7 for creating an external field of vibration energy from the sweep frequency generator 5, and a discriminator 6.

Next, the operation will be explained. The resonators 3a to 3n of the identification code body 1 can normally use a crystal resonator, a ceramic resonator, or a ferroelectric resonator, and have the property of absorbing energy at the same frequency as its self-resonant frequency. A field is created by a coupler 7 using energy from an external sweep frequency generator 5.

If identification code body 1 is placed in this field,
For example, the field created by the coupler 7 and the coupler 2 are connected to the resonator 3 via the coupler 2 by sweeping the frequency of the electromagnetically coupled vibration energy with the sweep frequency generator 5.
Since a, 3b, . . . , 3n sequentially absorb the energy of the sweep frequency, the potential of the coupler 7 decreases, and by detecting this with the level detector 6, the identification reading device 4 can detect the resonant frequency. can.

The sweep frequency F, to F of the identification reader 4 is divided into a certain range of frequencies Δf, that is, N=(F,
-F, )/Δf is converted into an integer, and if it is set sufficiently larger than the half width of the Q value of the resonators 38 to 3n, the resonant interval of the N interval from the sweep frequency F to F is set to ``0'' and non-resonant. If the interval is "1", the identification code body 1 is, for example, [1, 1,
. . 1, 0, 1 . . . 0°0] N code strings are created. This combination consists of N resonators 3a to 3n.
can be used, so there are 2N-1 pieces.

If the length of Japan's roads is 1,111,000 (as of 1978), and one identification code body is provided every 1 km, approximately 1,110,000 are required, and the above-mentioned N of 20 is sufficient.

In other words, it would be possible to attach identification numbers to roads every 1 km using 20-bit codes.

FIGS. 2 and 3 show an embodiment in which the identification code body 1 and identification reading device 4 of the present invention are installed. Of these, FIG. 2 shows an identification code body 1 under the road surface 10.
is buried, and an identification reading device 4 is installed in a vehicle 9, which is a moving object. FIG. 3 shows a case where the identification code body 1 is installed on a part of the pillar 11 on the ground.

Figure 4 shows identification codes 18 to 1n at important points at road intersections.
is installed at the position marked with "・". When the car 9 passes through the identification code bodies 1a to 1n installed on the road, it reads each code information, searches for a place that matches the above code number written on the map in advance, and traces it on the map display device. The route can be displayed correctly,
Additionally, you can accurately know the name of the road and where you are on the road.

Of course, if you are between the identification code bodies 1, you can easily display it on the map by using the odometer of the car 9. As the number of identification code bodies 1 increases, position information can be known more accurately.

In addition, if the destination is known in advance, the display device passes through the identification code body 1, searches the code information written on the intersection map, and instructs whether to turn left, go straight, or turn right at the next intersection. It is also possible to notify the driver by displaying a warning using .

Furthermore, if map information is recorded on a compact disc (CD) ROM, searching can be made even faster by including the code information of the above-mentioned identification code body 1 in this map information.

In addition, the code information is 2, national highway 1, prefectural road, and expressway.

By entering codes for railroad crossings, rivers, railway bridge areas, etc.
The value of navigation increases and searches become easier.

By doing this, one identification code body will be distributed throughout Japan.
Even if they were installed one at a time, it would only require about 1 million units, and since they are composed only of passive circuit elements, they can be used semi-permanently, and users can determine their current location using only an identification reader and map information. You can know.

〔Effect of the invention〕

As explained above, when a moving object approaches an identification code body, this invention reads the information on the identification code body using an identification reader, and searches and displays the location where the information on the identification code body is stored in advance on a road map. As a result, the location on the road can be accurately indicated, the search is easy, the identification code can be installed over a wide range, and the usefulness of navigation is increased.

[Brief explanation of the drawing]

FIG. 1 is a block diagram configuring an embodiment of the navigation system of the present invention, FIGS. 2 and 3 are diagrams showing the positional relationship between the identification code body and the identification reader in the same navigation system, and FIG. The figure shows the state in which the identification code body 1 of the navigation system of the present invention is installed on a road. 1...Identification code body, 2,7...Connection word, 3a-3n
... Resonator, 4... Identification reader, 5... Sweep frequency generator, 6... Level detection word, 8... Identification Jin,
9...car, 10...ground. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] An identification code body with built-in road position information and a plurality of code information installed near the road, and an identification code body installed on a moving body and read the information of the above identification code body while the mobile body is moving, and pre-incorporate it into map information. A navigation system equipped with an identification reader that checks coded information to indicate road names, a route from the current location, or a direction to travel to a pre-scheduled destination.