JP2002260158A - Radio wave lane marker system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio wave lane marker system capable of miniaturizing the size thereof while maintaining the vehicle position detection accuracy, ensuring the continuous motion for a long time, and reducing the cost requiring exchanges, maintenance, etc. SOLUTION: The radio wave transmitted from a transmission antenna 213 of an onboard machine 5 is received by a position information transmission marker 2 employing the frequency conversion (multiplication) system, multiplied, and returned to a reception antenna 211 of the onboard machine 5. The onboard machine 5 detects the position by the received multiplied radio wave. The same radio wave transmitted from the onboard machine 5 is received by a road information transmission marker 3 employing the frequency conversion (multiplication) resonance system as the carrier wave in a similar manner to the position information transmission marker 2, a built-in memory circuit 207 and modulation circuit 206 are operated to perform the modulation, and the origin information of the road is transmitted to the onboard machine 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
(Intelligent TransportSys
tem), AHS (Automated Highwa)
y System) or ACAHS (Advanced)
d Cyuise-Assist Highway S
system), and controls the traveling of vehicles traveling on the road to improve traffic efficiency, convenience,
The present invention relates to a radio lane marker system for improving safety and the like.

[0002]

2. Description of the Related Art Conventionally, in a lane marker system, for example, as disclosed in Japanese Patent Application Laid-Open No. 8-31454, a magnetic system is used for position detection, and a radio wave active system is used for road information detection.

FIGS. 5 and 6 show an example of the configuration of a conventional lane marker system. In FIG. 5 showing a schematic configuration of a conventional lane marker system, a position information sending marker 2 composed of a disk-shaped magnet buried at equal intervals (2 m in the figure) in the center of a road lane 1 and a vicinity of a bumper of a vehicle 4 , Five magnetic sensors 603 are shown. In addition, a road information transmitting marker (not shown in FIG. 5) for transmitting information such as a base point of a road by a radio signal, and a receiving antenna 611 mounted on the vehicle 4 for receiving the radio signal. is there.

FIG. 6 shows details of the configuration of a conventional lane marker system. In FIG. 6, the position information sending marker 2 includes a disc-shaped or column-shaped magnet and a yoke (magnetic circuit 602). The road information transmitting marker 3 is mainly composed of a transmission antenna 604 having a loop shape in appearance. For example, an oscillation circuit 605 for generating a signal of a predetermined frequency such as 250 kHz, and a modulation of this signal. And a memory circuit 607 storing binary data corresponding to information such as a base point of a road.
And a loop-shaped transmitting antenna 604 for radiating radio waves.

Further, the on-vehicle device 5 is provided with a plurality of magnetic sensors 603 (five in FIG. 6) mounted near the bumper of the vehicle 4 and the output of the magnetic sensors 603 to the vehicle 4.
610, a reception antenna 611 formed of a ferrite bar for receiving a radio signal from the road information transmission marker 3, and a reception for amplifying a signal received by the reception antenna 611. Circuit 612
And an information detecting circuit 613 for demodulating the signal from the receiving circuit 612 and detecting information such as a road base point transmitted by the road information transmitting marker 3.

Next, the operation of the conventional lane marker system will be described. First, the operation of position detection will be described. The magnetic field generated by the position information sending marker 2 is theoretically inversely proportional to the cube of the distance from the marker. Therefore, a plurality of magnetic sensors 603 (S1, S2, S3, S3 in FIG. 6)
4 and S5) are also inversely proportional to the cube of the distance from the position information sending marker 2.

FIG. 7 shows an example of the distribution of the magnetic intensity from the position information sending marker 2. As shown in FIG. 7, assuming that an output of M3 is obtained at S3 closest to the position information sending marker 2 and an output of M4 is obtained at S4 which is the second closest to the position information sending marker 2, the vehicle 4 and the marker 2 are obtained from these two outputs. Can be calculated.

Next, the operation of road information detection will be described. In the road information transmission marker 3 shown in FIG. 6, power is supplied from the power supply 608, and the oscillation circuit 605 creates a carrier having a predetermined frequency and sends it to the modulation circuit 606. The memory circuit 607 stores, as binary data, information such as the base point of the road, which is given in advance to the road information sending marker 3, and the binary data corresponds to the voltage level L, H. The signal is applied from the memory circuit 607 to the modulation circuit 606 as a signal.
The carrier wave (carrier) is amplitude-modulated by a signal representing binary data from the memory circuit 607, sent to the loop-shaped transmitting antenna 604, and emitted as a radio signal.

FIG. 8 shows L and H corresponding to binary data.
3 shows an example of a signal waveform obtained by amplitude-modulating a carrier wave (carrier) with the above signal. A receiving antenna 611 formed of a ferrite bar of the on-vehicle device 5 receives a radio signal whose waveform is shown in FIG.
Is received. The information detection circuit 613 demodulates the signal to draw an envelope (envelope), and detects data corresponding to a binary number, that is, information including a base point of a road, from the envelope (envelope).

As described above, in the conventional lane marker system, the position information transmission marker 2 and the road information transmission marker 3 transmit a signal, and the on-vehicle device 5 is configured to receive the signal. It was possible to simultaneously detect the position and the road information.

[0011]

However, such a conventional lane marker system has the following problems.

First, the method of the position information sending marker 2 is as follows.
This is a problem arising from being a magnetic type. That is, in the magnetic type, since the magnetic field strength is inversely proportional to the cube of the distance, foreign matter such as a magnetic metal material easily adheres to the ground surface where the marker is buried, and the magnetic field strength changes due to the foreign matter attached. However, the position detection accuracy is deteriorated. further,
In addition to the necessity of cleaning the road side to remove foreign substances, the magnetic field strength is weak at a height of 50 cm above the ground where a sensor may be mounted on a large car, and the detected magnetic field strength is 0. Since the level is equivalent to 3 Gauss, S
The problem is that N is poor and position detection and accuracy are further deteriorated.

The second problem is related to the road information sending marker. Since the road information transmission marker 3 used in the conventional lane marker system is an active system that always generates and emits radio waves, the power consumption increases, and the power source is, for example, 100 V AC, a secondary battery, a solar battery,
Alternatively, there is a problem that a combination of these forms is required, the power supply becomes considerably large, and the infrastructure cost for laying the lane marker system increases.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a radio wave lane marker system capable of maintaining position detection accuracy and reducing infrastructure cost.

[0015]

SUMMARY OF THE INVENTION A radio lane marker system according to the present invention transmits a position information transmitting marker installed at the center of a lane of a road and information on a road installed separately from the position information transmitting marker. The vehicle includes a road information transmission marker, an in-vehicle device equipped with a transmission unit and a reception unit, and mounted on a vehicle. The transmission unit includes an oscillation circuit that generates a signal of a first frequency, and a first circuit that transmits the signal as an electromagnetic wave. A position information transmission marker including a transmitting antenna, a second receiving antenna for receiving an electromagnetic wave of a first frequency, a first conversion circuit for converting a signal of the first frequency into a signal of a different second frequency, A second transmitting antenna for transmitting a frequency signal as an electromagnetic wave, wherein the road information transmitting marker includes a third receiving antenna for receiving the first frequency electromagnetic wave, and a second transmitting antenna for transmitting the received first frequency signal. A second conversion circuit for converting into two-frequency signals, a memory circuit for storing pre-assigned road information, and a signal output from the second conversion circuit as a carrier wave, and the information stored in the memory circuit A modulation circuit that modulates the carrier in a corresponding manner, and a third transmission antenna that transmits the modulated second frequency signal as an electromagnetic wave,
Receiving means for receiving a second frequency electromagnetic wave from the position information transmission marker and a modulated second frequency electromagnetic wave transmitted from the road information transmission marker;
Position / information detection that detects the position of the vehicle in the lane width direction on the traveling lane based on the received signal from the position information transmission marker, and detects road information by demodulating the signal from the road information transmission marker. And a circuit for detecting position information and road information. With this configuration, regarding the position detection, the distance between the marker and the antenna can be increased by utilizing the fact that the electromagnetic field strength is theoretically inversely proportional to the square of the distance, and an improvement in the position detection range and accuracy is expected. In addition to this, for road information detection, a carrier wave (carrier) is supplied from an on-vehicle device so that only the modulation circuit of the road information transmission marker is operated. The new method of the present invention close to
/ 100, which can be changed to a small power supply that can be guaranteed for 10 years with a primary battery, which can be used to reduce the size of markers and reduce infrastructure costs.

Further, the radio wave lane marker system of the present invention has a configuration in which the first and second conversion circuits for converting the signal of the first frequency into the second frequency are frequency multipliers.
With this configuration, it is possible to suppress the waveform distortion of the electromagnetic wave transmitted from the transmitting antenna together with the transmitting section resonance circuit of the position information transmitting marker and the road information transmitting marker, and to improve the accuracy of position detection and information detection.

Further, the radio wave lane marker system according to the present invention comprises a position information transmission marker installed at the center of the lane of the road, and a road information transmission marker installed separately from the position information transmission marker. And an in-vehicle device mounted on the vehicle including a transmitting unit and a receiving unit. A first transmitting antenna, and a position information sending marker, a second receiving antenna for receiving an electromagnetic wave of a first frequency, a first converting circuit for converting a signal of the first frequency into a signal of a different second frequency, A second transmitting antenna for transmitting a signal of the second frequency as an electromagnetic wave, wherein the road information transmitting marker comprises: a third receiving antenna for receiving the electromagnetic wave of the third frequency; A second conversion circuit for converting a number of signals into a signal of a different fourth frequency, a memory circuit storing road information given in advance, and a signal of the fourth frequency output from the second conversion circuit as a carrier wave A modulation circuit for modulating a carrier wave in accordance with information stored in a memory circuit, and a third transmission antenna for transmitting a modulated signal of a fourth frequency as an electromagnetic wave, wherein the receiving means comprises a position information transmission marker. A first receiving antenna for receiving the second frequency electromagnetic wave transmitted from the vehicle and the modulated fourth frequency electromagnetic wave transmitted from the road information transmission marker, and traveling based on the received second frequency signal from the position information transmission marker A position / information detection circuit for detecting the position of the vehicle on the lane in the lane width direction and demodulating a signal of the fourth frequency from the road information transmission marker to detect road information. And has a structure for detecting the information of the position information and the road. With this configuration, it is possible to greatly increase the information amount of the road information transmission marker while maintaining the position detection range and accuracy in position detection.

Further, in the radio wave lane marker system according to the present invention, the first conversion circuit for converting the signal of the first frequency to the second frequency and the second conversion circuit for converting the signal of the third frequency to the fourth frequency are each provided with a frequency. It has a configuration that is a multiplier circuit. With this configuration, it is possible to suppress the waveform distortion of the electromagnetic wave transmitted from the transmitting antenna together with the transmitting section resonance circuit of the position information transmitting marker and the road information transmitting marker, and to improve the accuracy of position detection and information detection.

Further, the radio wave lane marker system of the present invention has a configuration in which the frequency doubler is a doubler.
With this configuration, the circuit configuration can be simplified, and the circuit cost can be reduced while maintaining the performance.

Further, the radio wave lane marker system of the present invention has a configuration in which the signal of the first frequency generated by the oscillation circuit is a sine wave. With this configuration, it is possible to reduce mixing of harmonics into the electromagnetic wave signal transmitted from the transmitting antenna together with the position information transmission marker and the road information transmission marker, and to suppress the influence on other communication.

Further, the radio lane marker system of the present invention has a configuration in which the frequency of the sine wave signal of the first frequency generated by the oscillation circuit is in the long and medium wave band. With this configuration, for example, when the frequency is low, such as the long and medium wave band, the directivity of radio wave radiation is wide, and the influence of the surrounding metal body is reduced,
The position detection range can be expanded and the accuracy can be improved.

Further, the radio wave lane marker system of the present invention has a configuration in which the frequency of the first frequency sine wave signal generated by the oscillation circuit is in the range of 200 kHz to 263 kHz. With this configuration, the influence of AM medium-wave broadcasting can be suppressed, electromagnetic wave noise generated by the vehicle can be avoided, and the accuracy of both position detection and information detection can be improved.

Further, in the radio wave lane marker system of the present invention, the frequency of the sine wave signal of the first frequency generated by the oscillation circuit is in the long and medium wave band, and the frequency of the sine wave signal of the third frequency is the medium and short wave. It has a configuration that is in the band. With this configuration, the position detection range is extended and the accuracy is improved by using the frequency of the long and medium wave band, which has wide directivity of radio wave radiation and little influence of the surrounding metal body, for the position detection. The amount of information can be increased by using a frequency in the medium-short wave band in which the modulation speed can be increased in proportion to.

Further, in the radio wave lane marker system of the present invention, the frequency of the first frequency sine wave signal generated by the oscillation circuit is in the range of 200 kHz to 263 kHz, and the frequency of the third frequency sine wave signal is 1607 kHz.
From 10 MHz to 10 MHz. With this configuration, it is possible to suppress the influence of AM medium-wave broadcasting, to improve the accuracy of position detection by avoiding electromagnetic wave noise generated by the vehicle, and to prevent the flood information, snow cover, ice, and the like from adversely affecting the road information transmission marker. Thus, the reliability of information detection can be improved.

[0025]

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

(First Embodiment) FIGS. 1 and 2 show a configuration of a radio wave lane marker system according to a first embodiment of the present invention. In FIG. 1 schematically showing the entirety, and FIG. 2 showing a main part in a block diagram in somewhat more detail, an in-vehicle device 5 mounted on a vehicle 4 running on a road lane 1
Is an oscillation circuit 205 included in the transmission means 201, for example, oscillates a sine wave (in the case of FIG. 2) having a frequency of 220 kHz, and amplifies it by an amplifier circuit 202 including a power amplifier. The signal is sent to the first transmitting antenna 213 formed of a coil, and a sine wave signal is emitted as an electromagnetic wave.

When the vehicle 4 approaches the position information sending marker 2 (circuit configuration is shown in FIG. 3) for position detection, the frequency radiated from the vehicle 4, for example, 220 kHz electromagnetic wave is formed by a ferrite bar. 2 is an example of a circuit for frequency conversion in which the position information sending marker 2 having a first receiving section resonance circuit 311 having a resonance point at a frequency of 220 kHz received by the 2 reception antenna 316 performs a resonance operation, and is an example of a circuit for frequency conversion. The first frequency multiplication circuit 315 made of, for example, converts a signal having a frequency of 220 kHz into a signal having a frequency
Convert to a 0 kHz signal. Next, a second coil formed as a loop coil antenna by a coil constituting the transmitting section of the position information sending marker 2 together with the first transmitting section resonance circuit 313
The transmission antenna 215 transmits an electromagnetic wave of 440 kHz.

Here, the shape of the position information sending marker 2 will be specifically described. The second transmission antenna 215 is
For example, it is configured as an annular loop coil antenna formed by a substrate pattern. Also, this board has
Circuit components such as capacitors, diodes, and resistors are mounted. The second receiving antenna 216 is formed by, for example, installing a columnar ferrite bar inside the annular loop coil.

The apparatus main body of the position information sending marker 2 configured as described above is sealed, for example, in a disc-shaped or column-shaped case, and buried in the road lane 1 for use.

On the other hand, a road information transmitting marker 3 for holding road information such as a base point has basically the same configuration as the position information transmitting marker 2, and differs from the configuration of the position information transmitting marker 2. A memory circuit 207 for holding data such as road information, a modulation circuit 206 for modulating with a signal corresponding to this data, and a power supply 208 for operating the modulation circuit 206 and the memory circuit 207 are added. It is a point. Next, an operation of the radio wave lane marker system according to the first embodiment of the present invention will be described. The electromagnetic wave having a frequency of, for example, 220 kHz, which is oscillated and amplified by the transmitting means 201 of the vehicle-mounted device 5 shown in FIG. . When the vehicle 4 approaches the position information sending marker 2, the receiving unit first resonance circuit 311 of the position information sending marker 2 whose circuit configuration is shown in FIG. Therefore, the first frequency conversion (multiplication) circuit 315 changes the frequency, for example, to 440 kHz which is twice as high.
z, and resonates at a frequency of 440 kHz from the first transmission unit resonance circuit 313 of the position information transmission marker 2, and resonates at a frequency of 4 kHz from the second transmission antenna 215 of the position information transmission marker 2.
Emit 40 kHz electromagnetic waves.

The three first receiving antennas 21 of the vehicle-mounted device 5
1 has a reception sensitivity characteristic substantially similar to a Gaussian distribution with respect to the position, and calculates the lateral position of the vehicle 4 from the positional relationship between the antenna indicating the highest level and the antenna indicating the second highest level. I do.

On the other hand, a frequency modulated by a signal of binary data corresponding to the information such as the base point of the road, for example, an electromagnetic wave of 440 kHz is radiated from the road information transmitting marker 3 and demodulated. Detect information.

As described above, the radio wave lane marker system according to the first embodiment of the present invention employs the frequency conversion (multiplication) resonance method, so that the antenna can be mounted more freely in position detection than in the magnetic method. The degree of accuracy is high, and reception is possible even when mounted near a bumper of a large vehicle, so that the lateral position detection accuracy can be improved.

Further, in the road information detection, a carrier wave (carrier) is transmitted from the on-vehicle device 5. Therefore, the road information transmission marker 3 does not require a carrier wave (carrier) generation circuit, and the memory circuit 207 and the modulation circuit. It is sufficient that a current consumption of about several tens of μA can be supplied as the power supply 208 for circuit operation, and the operating life can be extended to 10 years or more with only a few primary batteries, and the number of replacements can be reduced.
This has the effect that infrastructure costs can be reduced.

(Second Embodiment) A second embodiment will be described with reference to FIG. 1, FIG. 2 and FIG.

FIG. 4 is a block diagram showing a configuration of a main part of a radio wave lane marker system according to a second embodiment of the present invention. The basic configuration is almost the same as FIG. 1 illustrating the configuration of the main part of the radio wave lane marker system according to the first embodiment of the present invention. The difference between the two is that the transmitting means 401 of the on-vehicle device 5 oscillates two or more types of signals having different frequencies and emits two or more types of different electromagnetic waves, and the entire system supports a plurality of frequency signals. It is.

Hereinafter, the second embodiment of the present invention will be described with emphasis on contents different from the first embodiment in order to avoid duplication. In the example of FIG. 4, the frequency of the electromagnetic wave used for transmitting the position information is, for example, 220 kHz of a medium-long wave, and the frequency of the electromagnetic wave used for detecting information is, for example, 3 MHz of a short wave. And 2
The signal of one frequency is output from the oscillation circuit 4
After being created in step 05, the signals are sent to different coils formed corresponding to the respective frequencies, which further serve as transmitting antennas, via the amplifier circuit 402 including power amplifiers corresponding to the respective frequencies. . These coils are wound around a ferrite core forming the first transmitting antenna 413.

In accordance with the above description, the road information transmission marker 3 is configured such that the second receiving section resonance circuit 321 resonates at, for example, a frequency of 3 MHz, and performs second frequency conversion (multiplication) for frequency conversion. ) The circuit 325 converts the frequency into an electromagnetic wave having a double frequency of 6 MHz,
An electromagnetic wave having a frequency of 6 to 6 MHz is radiated through the third transmitting antenna 404.

Further, the signal receiving section of the vehicle-mounted device 5 also
Receiving antenna 411 from the road information sending marker 3
For example, an electromagnetic wave signal having a frequency of 6 MHz is received, amplified by a receiving circuit 412, sent to a position / information detecting circuit 410, and demodulated to detect information such as a base point of a road.

The position information sending marker 2 is as follows.
Since the configuration is exactly the same as that of the first embodiment, the description is omitted to avoid duplication.

Next, the operation of the radio wave lane marker system according to the second embodiment of the present invention will be described. An electromagnetic wave having a frequency of, for example, 220 kHz and 3 MHz oscillated and amplified by the transmitting unit 401 of the vehicle-mounted device 5 shown in FIG. 4 is transmitted from a first transmitting antenna 413 formed by winding a coil around a rectangular parallelepiped ferrite block, for example. Radiate.

When the vehicle 4 traveling on the road lane 1 approaches the marker, the position information transmission marker 2 and the road information transmission marker 3
Receive an electromagnetic wave signal with each of the second and third receiving antennas 416 and 404 formed of ferrite bars, and have first and second receiving unit resonance circuits having resonance points at frequencies of 220 kHz and 3 MHz, respectively. 31
1 and 321 perform resonance operation, and the first and second frequency multipliers 31 for frequency conversion formed by the full rectifier circuit
5 and 325 respectively convert signals having frequencies of 220 kHz and 3 MHz into, for example, double frequencies of 440 kHz and 6 MHz.
440kHz, 6MHz respectively
First and second receiver resonance circuit 3 having a resonance point at z
The first and second transmitting section resonance circuits 313 and 323 having resonance points at 11 and 321 resonate, and the second and third loops formed by the annular loop coils of the position information transmission marker 2 and the road information transmission marker 3. The transmitting antennas 415 and 404 radiate electromagnetic waves having frequencies of 440 kHz and 6 MHz, respectively.

The three first receiving antennas 411 formed of the ferrite bar of the on-vehicle device 5 also have a receiving sensitivity characteristic substantially similar to a Gaussian distribution with respect to the position, and receive the largest level electromagnetic wave signal. The lateral position of the vehicle 4 is calculated based on the positional relationship between the antenna that has received and the antenna that has received the second largest electromagnetic wave signal.

On the other hand, a frequency different from that of the position marker modulated by the signal of the binary data corresponding to the information such as the base point of the road from the road information transmitting marker 3, for example, 6 MHz.
Are received by the first receiving antenna 411 formed of the ferrite bar of the on-vehicle device 5, the signal is amplified by the receiving circuit 412, and the position information detecting circuit 41
0 and demodulated to detect information such as the base point of the road. In this case, for example, in the case of an electromagnetic wave in a short wave band, the frequency of a carrier wave (carrier) is ten times or more as compared with the example of the long and medium wave band shown in the first embodiment. It can be ten times or more, and the information amount can be ten times or more.

As described above, in the radio wave lane marker system according to the second embodiment of the present invention, since the frequency is low for position detection, the directivity of radio wave radiation is wide and the influence of the surrounding metal body is small. , For example, a medium-long band (30 to 160
0 kHz), the position detection range and accuracy can be maintained by using a radio band in the frequency range of, for example, a medium-long band (1600 kHz to 29 MHz) for road information detection.
Use the radio band of the frequency range, increase the modulation speed,
By increasing the amount of information, the problem of the conventional radio lane marker system can be solved.

In the description of the second embodiment, the frequency of the electromagnetic wave used is lower than 200 kHz because the frequency of the radio noise generated by the vehicle is lower than 200 kHz. , There is an upper limit of the frequency of 20 MHz due to the transmission characteristics of electromagnetic waves due to flooding, snow cover, ice and the like. In addition, the frequency band from 526.5 kHz to 1606.5 kHz cannot be used because it is allocated to AM broadcasting.

In order to radiate electromagnetic waves having greatly different frequencies, coils used as antennas are separately provided for position detection and information detection. For example, a ferrite core having a rectangular parallelepiped shape is used for miniaturization. It is also possible to use a method in which the film is formed by winding.

In the above-described embodiment of the present invention, an example in which a ferrite bar antenna is used as the position information transmission marker, the road information transmission marker, and the receiving antenna for the receiving means of the vehicle-mounted device is described. An example in which an antenna formed by an air-core coil is used as the transmission antenna of the information transmission marker, and an example in which an antenna formed by winding a coil around ferrite is used as the transmission antenna for the transmission means of the vehicle-mounted device will be described. did.

However, the antenna is not limited to the types described in these examples.
A method of forming an antenna by separately winding coils for different frequencies on one ferrite, a method of forming an antenna using multiple ferrites, and forming an antenna by winding coils of different frequencies on multiple ferrites In the long and medium wave band, a ferrite bar antenna is used, and in the medium and short wave band, an antenna formed by an air-core coil is used. In addition to these methods, examples of these methods mentioned here It is possible to adopt a method suitable for the frequency band to be used, such as a method of combining.

Furthermore, it is also possible to transmit and receive electromagnetic waves of different frequencies in a time-division manner using antennas of the same type or different types of combinations.

[0051]

As described above, the radio wave lane marker system of the present invention adopts the frequency conversion (multiplication) resonance method also for the position information transmission marker, so that the electromagnetic field intensity can be reduced to the position information transmission marker and the vehicle-mounted position information marker. Because it is inversely proportional to the square of the distance between the receiving antennas (the magnetic type is inversely proportional to the cube of the distance), it is easy to obtain a large magnetic field strength, the degree of freedom in mounting the antenna is high, and even in a large vehicle that is high above the ground, There is an effect that mounting is possible and lateral position detection accuracy can be improved.

Also, a carrier wave (carrier) can be transmitted from the vehicle-mounted device to the road information transmission marker. The road information transmission marker only needs to have a power supply for operating the memory circuit and the modulation circuit. With this primary battery, continuous operation can be guaranteed for more than 10 years.
This has the effect of reducing the infrastructure costs required for the exchange and conservative party.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a radio wave lane marker system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a radio lane marker system according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a resonance and frequency conversion (multiplication) circuit of the radio wave lane marker system of the present invention.

FIG. 4 is a block diagram illustrating a configuration of a radio lane marker system according to a second embodiment of the present invention.

FIG. 5 is a diagram schematically showing a configuration of a conventional lane marker system.

FIG. 6 is a diagram showing a configuration of a conventional lane marker system.

FIG. 7 is a diagram showing an example of a magnetic field intensity distribution of a position information sending marker of a conventional lane marker system.

FIG. 8 is a diagram illustrating an example of a signal transmitted from a road information transmission marker.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Road lane 2 Position information sending marker 3 Road information sending marker 4 Vehicle 5 On-vehicle device 201, 401 Transmitting means 202, 402 Amplifying circuit 203, 216, 403, 416 Receiving antenna (for marker) 204, 215, 404, 415 Transmitting antenna (For marker) 205,405 Oscillation circuit (for vehicle) 203,403,606 Modulation circuit 207,407,607 Memory circuit 208,408,608 Power supply 210,410 Position / information detection circuit 211,411,611 Receiving antenna (for vehicle) 212, 412, 612 Receiving circuit 213, 413 Transmitting antenna (for in-vehicle use) 311, 321 Receiving unit resonance circuit 313, 323 Transmitting unit resonance circuit 315, 325 Frequency conversion (multiplication) circuit 602 Magnetic circuit 605 Oscillation circuit (for marker) ) 611 Magnetic sensor

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Akira Nakatsuka 1006 Kazuma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. F term (reference) 5H180 AA01 BB04 BB06 CC12 CC24 5K067 AA41 BB36 BB43 EE02 EE13 EE35 GG01 GG11 JJ52

Claims (10)

[Claims] 1. A position information transmission marker installed at the center of a lane of a road, a road information transmission marker installed separately from the position information transmission marker for transmitting information on the road, transmission means and reception means The transmitting means comprises: an oscillating circuit that generates a signal of a first frequency; and a first transmitting antenna that transmits the signal as an electromagnetic wave. The information transmission marker includes a first receiving antenna that receives the electromagnetic wave of the first frequency, a first conversion circuit that converts the signal of the first frequency into a signal of a different second frequency, and an electromagnetic wave that converts the signal of the second frequency into an electromagnetic wave. A road information transmission marker, a third reception antenna that receives the electromagnetic wave of the first frequency, and a second reception antenna that transmits the received signal of the first frequency to the second transmission antenna. A second conversion circuit that converts the signal into a wave number signal, a memory circuit that stores pre-assigned road information, and a signal output from the second conversion circuit serving as a carrier wave, and the information stored in the memory circuit. A modulating circuit for modulating the carrier in accordance with
A third transmitting antenna for transmitting a signal of a frequency as an electromagnetic wave, wherein the receiving unit modulates the electromagnetic wave of the second frequency from the position information transmitting marker and the modulated second signal transmitted from the road information transmitting marker. A first receiving antenna for receiving electromagnetic waves of two frequencies, and detecting a position of the vehicle in the lane width direction on the traveling lane based on the received signal from the position information transmission marker, and detecting the position of the vehicle from the road information transmission marker. A radio wave lane marker system comprising a position / information detection circuit for demodulating a signal to detect road information. 2. The radio wave lane marker system according to claim 1, wherein the first and second conversion circuits for converting the signal of the first frequency into the second frequency are frequency multipliers. 3. A position information transmission marker installed at the center of the lane of the road, a road information transmission marker installed separately from the position information transmission marker for transmitting information on the road, transmission means and reception means. And an on-board unit mounted on the vehicle, comprising: an oscillating circuit that generates a signal having a first frequency and a third frequency different from the first frequency; and a first transmitting antenna that transmits the signal as an electromagnetic wave. The position information sending marker comprises: a second receiving antenna that receives the electromagnetic wave of the first frequency; a first conversion circuit that converts the signal of the first frequency into a signal of a different second frequency; A second transmitting antenna for transmitting a signal of two frequencies as an electromagnetic wave, wherein the road information transmitting marker is configured to receive a third receiving antenna for receiving the electromagnetic wave of the third frequency; A second conversion circuit for converting the signal of the third frequency into a signal of a different fourth frequency, a memory circuit storing information of roads given in advance, and a signal of the fourth frequency output from the second conversion circuit. A modulation circuit that modulates the carrier in accordance with the information stored in the memory circuit, and a third transmission antenna that transmits the modulated signal of the fourth frequency as an electromagnetic wave; Receiving means for receiving the electromagnetic wave of the second frequency from the position information transmission marker and the modulated electromagnetic wave of the fourth frequency transmitted from the road information transmission marker, and the received position information The position of the vehicle in the lane width direction on the traveling lane is detected based on the signal of the second frequency from the sending marker, and the signal of the fourth frequency from the road information sending marker is detected. Telecommunications lane marker system and demodulated and a position-information detection circuit detecting the information of the road, and detecting the position information and road information. 4. The frequency conversion circuit according to claim 1, wherein the first conversion circuit for converting the signal of the first frequency to the second frequency and the second conversion circuit for converting the signal of the third frequency to the fourth frequency are respectively frequency multiplier circuits. 4. The radio wave lane marker system according to claim 3, wherein: 5. The radio wave lane marker system according to claim 2, wherein said frequency multiplying circuit is a doubler circuit. 6. The radio wave lane marker system according to claim 1, wherein the signal of the first frequency generated by the oscillation circuit is a sine wave. 7. The radio wave lane according to claim 1, wherein the frequency of the sine wave signal of the first frequency generated by the oscillation circuit is in a long and medium wave band. Marker system. 8. The radio wave lane marker system according to claim 7, wherein the frequency of the sine wave signal of the first frequency generated by the oscillation circuit is in a range from 200 kHz to 263 kHz. 9. The sine wave signal of the first frequency generated by the oscillation circuit is in a long and medium wave band, and the frequency of the sine wave signal of the third frequency is in a medium and short wave band. The radio wave lane marker system according to claim 3. 10. The frequency of the sine wave signal of the first frequency generated by the oscillation circuit is from 200 kHz to 263 kHz.
The radio wave lane marker system according to claim 9, wherein the frequency of the sine wave signal of the third frequency is in a range of 1607kHz to 10MHz.