JP2002260171A - In-vehicle terminal device and optical beacon receiver - Google Patents

Abstract

(57) [Summary] To provide an in-vehicle terminal device capable of further improving the accuracy of automatic switching. An optical beacon signal processing unit (8) instructs a switch (9) to perform switching when detecting predetermined identification information from a photodetector in signal processing of an optical signal. The radio beacon signal processing unit 7 instructs the switch 9 to transmit a signal from the radio beacon signal processing unit 7 to the image processing unit 10 when receiving a radio wave. Switch 9
Sends the signal processed by the GPS signal processing unit 2 to the image processing unit 10 and, when instructed by the optical beacon signal processing unit 8 to switch, the signal from the optical beacon signal processing unit 8 to the image processing unit 10 When the switching is instructed by the radio wave beacon signal processing unit 7, the signal from the radio wave beacon signal processing unit 7 is switched to be transmitted to the image processing unit 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a beacon receiver for receiving a traffic information signal or the like transmitted from a roadside beacon installed on a roadside and displaying the signal on a display unit mounted on a vehicle, and a satellite based on information from a satellite. GPS that calculates the position coordinates of the vehicle
I / F circuit switching method for beacon receiver and GPS receiver in the case where beacon receiver and GPS receiver are incorporated in an integrated housing and communication I / F circuit is shared About.

[0002]

2. Description of the Related Art Conventionally, a beacon installed on the road side transmits traffic information and the like specific to the location of the beacon, and a vehicle-mounted terminal device receives the traffic information in a running vehicle and transmits the traffic information to a vehicle-mounted display device. Beacon systems that display and allow drivers to easily know traffic jam information are being rolled out nationwide.

[0003] Beacons are classified into radio beacons that provide traffic information by using radio waves and optical beacons that provide traffic information by using infrared rays. Is usually located on a general road.

[0004] On the other hand, a technology for measuring the position of a vehicle using radio waves from GPS satellites has become widespread. GPS measures the propagation delay time of radio waves radiated by a plurality of artificial satellites orbiting a predetermined start-up, so that the two-dimensional
The three-dimensional position is measured, and the current position of the vehicle is displayed on an on-vehicle display device based on information measured by receiving GPS satellite radio waves, so that the driver can easily operate the vehicle. The position can be grasped.

Conventionally, in a configuration in which an optical beacon receiver and a GPS receiver are built in an integrated housing and connected to a navigation device by a common communication I / F circuit, the beacon receiver and the GPS receiver are used. As a technique for switching an I / F circuit, as disclosed in Japanese Patent Application Laid-Open No. 07-282390, the current position of a vehicle obtained from a GPS receiver and information on the installation location of a photosensor registered in advance are disclosed. And a technique for determining the switching of the intensity of sunlight by an optical sensor has been proposed.

[0006]

In the above prior art, when the current position of the vehicle obtained from the GPS receiver and the information on the installation location of the photodetector registered in advance are used as judgment data for switching the reception data, for example, When a photosensor installed on the road is newly installed, moved, or abolished, the installation location information of the photosensor registered in advance may be left unchanged without being updated. In particular, when the installation location is frequently changed, there is a problem in that the received data is switched according to the old installation location information without updating.

[0007] Further, in the technique in which the intensity of sunlight is determined for switching, the level of sunlight is easily affected by time such as day and night, season, weather, and the like, and it is difficult to obtain sufficient switching accuracy.

[0008] As described above, the conventional technique described above has a problem that sufficient accuracy cannot be obtained for automatic switching.

An object of the present invention is to provide an in-vehicle terminal device and an optical beacon receiver capable of improving the accuracy of automatic switching to solve the above-mentioned problems.

[0010]

In order to solve the above-mentioned problems, the present invention provides a radio beacon receiving means for receiving a radio wave transmitted from a radio beacon installed on a roadside, and a radio beacon receiving means for receiving the radio wave beacon. Radio beacon signal processing means for performing signal processing of the transmitted radio wave, optical beacon light receiving means for receiving an optical signal transmitted from a photodetector installed on the roadside, and light for projecting an optical signal to be transmitted to the photodetector Beacon light emitting means, optical beacon signal processing means for performing signal processing of the optical signal, GPS receiving means for receiving a signal from an artificial satellite, and G for processing a signal received by the GPS receiving means
PS signal processing means, image processing means for performing image processing for display on the display means, and switching between signals processed by the radio wave beacon signal processing means, the optical beacon signal processing means and the GPS signal processing means. Switch means for sending the image data to the image processing means. The optical beacon signal processing unit instructs the switch unit to perform switching when detecting predetermined identification information from the photodetector in signal processing of the optical signal. The radio wave beacon signal processing unit instructs the switch unit to transmit a signal from the radio wave beacon signal processing unit to the image processing unit when receiving the radio wave. The switch means sends the signal processed by the GPS signal processing means to the image processing means, and when instructed to switch by the optical beacon signal processing means, outputs the signal from the optical beacon signal processing means to the image processing means. The signal is switched to be transmitted to the image processing means, and when the switching is instructed by the radio beacon signal processing means, the signal is switched to be transmitted to the image processing means.

According to the present invention, since switching is performed by detecting predetermined identification information from the photodetector, automatic switching is not performed without the photodetector, and high-precision switching is realized. it can. Further, since it is not necessary to register map information or the like in advance, even if the installation location of the photodetector is changed, the switching accuracy does not deteriorate. It is independent of the level of sunlight, so it does not depend on the surrounding conditions such as season or weather. Further, when the on-board terminal device receives the disturbance light, it is erroneously recognized as the downlink data from the photodetector, and even if the uplink is issued, if the on-board terminal device does not have the photosensor, the Since identification information cannot be obtained from the sensor, automatic switching is not performed, and erroneous switching can be prevented.

[0012]

Embodiments of the present invention will be described below in detail.

FIG. 1 is a block diagram showing a vehicle-mounted terminal device according to a first embodiment of the present invention.

In FIG. 1, a GPS receiver 1 receives information from a GPS. The GPS signal processing unit 2 performs signal processing of the GPS signal received by the GPS receiving unit 1. The optical beacon light receiving unit 3 receives the downlink from the light detector.
The optical beacon light emitting unit 4 emits an uplink to the light detector. The information type detection unit 5 detects whether the downlink received by the optical beacon light projection unit 4 is general additional information. Alternatively, the information type detection unit 5 may have a function of determining the validity of the data from the optical beacon. The radio beacon receiver 6 receives a radio beacon. The radio beacon signal processing unit 7 performs signal processing on the data received by the radio beacon reception unit 6. The optical beacon signal processing unit 8 performs signal processing of a downlink signal and signal generation of an uplink signal. The switch unit 9 switches output lines from the GPS, the optical beacon, and the radio wave beacon to the image processing apparatus. The image processing device 10 converts the transmitted traffic information into image data. The display 11 displays an image signal.

As an optical beacon receiver, an optical beacon light receiving section 3 for receiving an optical signal transmitted from an optical sensor installed on the road, and an optical beacon projector for emitting an optical signal to be transmitted to the optical sensor. An optical beacon signal processing unit for performing signal processing on the optical signal; an optical beacon signal processing unit configured to perform predetermined signal processing on the optical signal; May be configured to output a switching signal when detecting is detected.

Radio waves from GPS satellites are transmitted to a GPS receiver 1
The GPS signal processing unit 2 performs signal processing such as position information positioning, and the processed position information data is sent to the image processing unit 10 via the switch unit 9. Image processing unit 1
At 0, this data is converted to image data, and the converted data is provided to the driver of the vehicle via the display 11 as map information. The switch unit 9 switches data transmitted from each of the GPS signal processing unit 2, the optical beacon signal processing unit 8, and the radio wave beacon signal processing unit 7 to the image processing unit 10. The processing unit 10 is connected. In this case, the display device 11 displays map information around the traveling location of the vehicle.

The beacon information transmitted from the roadside radio beacon is obtained by subjecting a carrier in a quasi-microwave band to AM modulation of a GMSK and a modulation signal of 1 kHz, and a radio beacon signal processor 7 demodulates the beacon information and performs data processing. Is what you do. The beacon information from the roadside beacon is received by the radio beacon receiver 6, and the radio beacon signal processor 7 performs signal processing such as reproduction of a synchronization signal and descrambling. The data processed by the radio wave beacon signal processing unit 7 is displayed on the display 11 as beacon information via the switch unit 9 and the image processing unit 10 like the GPS signal. Here, the switch unit 9 is normally connected to the GPS signal processing unit 2 side, but approaches the reception area of the radio beacon, and the electric field detection result by the reception electric field level detection circuit 601 inside the radio beacon reception circuit 6 is set in advance. By transmitting a switching control signal 710 to the switch 9 so as to connect the radio beacon signal processing unit 7 and the image processing apparatus 10 via the radio beacon signal processing 7 when the threshold value is equal to or more than the predetermined threshold value, The traffic information can be displayed on the display 11 in the vehicle compartment.

On the other hand, the optical beacon is a system for providing beacon information using far-infrared rays from a photosensor provided on a road. When the vehicle enters the area of the light sensor, the light sensor transmits downlink information for notifying the area in, so that the vehicle can receive the light to know that the vehicle is in the area. The vehicle receives the downlink information from the photodetector at the photodiode in the optical beacon light receiving unit 3 and amplifies the noise with a low-noise amplifier. The amplified signal is converted into a square wave by the comparator, and the signal converted by the optical beacon data processing unit 8 is taken in. The optical beacon data processing unit 8 recognizes that it is within the area of the optical sensor by receiving the downlink information, and transmits the uplink information to the optical sensor via the optical beacon light emitting unit 4. The uplink information is transmitted as an optical signal to the photodetector by causing the LED to emit light via an LED driving circuit in the optical beacon light emitting circuit, and is captured by the photodetector of the optical beacon. The photodetector analyzes the received uplink information,
Necessary information such as a vehicle ID and a destination can be received. The light sensor transmits traffic information based on the situation of each vehicle to the vehicle as downlink information. The information issued at this time is composed of general additional information that is predetermined identification information that is issued only when the uplink information is provided from the vehicle, general basic information that does not depend on the presence or absence of the uplink information, and the like. . The vehicle receives the information and takes it into the optical beacon data processing unit 8. The acquired information is converted into image information via the switch unit 9 and the image processing unit 10 and is displayed on the display unit 11 so that the information can be provided to the driver.

Next, switching of the switch section 9 will be described in detail.

FIG. 2 is a flowchart of a process in the vehicle-mounted terminal device for explaining switching of the switch section 9 of the vehicle-mounted terminal device according to the embodiment of the present invention. In FIG. 2, in the initial setting, the switch unit 9 is set so that the GPS signal processing unit 2 and the image processing unit 10 are connected (S001), and the in-vehicle terminal device is in a GPS signal reception standby state. The in-vehicle terminal device converts the signal from the GPS into G
When the signal is received by the PS receiver 1, signal processing such as position information positioning is performed by the GPS signal processor 2, and the processed position information data is sent to the image processor 10 via the switch 9 (S002). Here, when the running vehicle equipped with the in-vehicle terminal device approaches the roadside beacon, the closer it approaches the roadside beacon, the higher the received electric field received from the roadside beacon. The reception electric field level detection circuit 601 of the radio wave beacon receiving unit 6 detects the reception electric field level, and when the reception electric field level reaches a predetermined threshold or more, a switch for switching to the switch 9 via the radio beacon signal processing unit 7. The control signal 710 is transmitted. Upon receiving the switching control signal from the radio wave beacon signal processing unit 7, the switch 9 switches the switch to the radio beacon side to connect the radio beacon signal processing unit 7 and the image processing apparatus 10 (S00).
4). Thereafter, when the vehicle passes immediately below the radio wave beacon (S005), via the switched switch 9,
The radio wave beacon signal processing unit 7 transmits the received radio wave beacon information to the image processing apparatus 10, and the display 11 can display the radio wave beacon information.

On the other hand, when the vehicle equipped with the in-vehicle terminal device enters the communication area of the photodetector in the GPS reception standby state, the optical beacon light receiving unit 3 receives the downlink information from the photodetector, The beacon data processing unit 8 recognizes that it is within the area of the photodetector by receiving the downlink information, and emits the uplink information to the photodetector via the optical beacon light emitting unit 4. When the photodetector detects an uplink from the vehicle, it sends downlink information including general additional information to the vehicle. When the information type detection unit 5 of the optical beacon signal processing unit 8 detects this general additional information (S0
08), and transmits a switch control signal 810 for switch switching to the switch 9. When receiving the switching control signal 810 from the optical beacon signal processing unit 8, the switch 9 switches the switch 9 to the optical beacon side, and connects the optical beacon data processing unit 8 and the image processing unit 10. In the optical beacon signal processing unit 8 or the radio wave beacon signal processing 7,
When the reception of each beacon information is completed, a switching control signal is transmitted to the switch 9, and the switch 9 switches so as to be connected to the initially set GPS side.

By such processing, the switch unit 9
The data transmitted from each of the GPS signal processing unit 2, the optical beacon signal processing unit 8, and the radio wave beacon signal processing unit 7 to the image processing unit 10 can be switched.

In FIG. 2, when the switching control signal 810 from the optical beacon signal processor 8 and the switching control signal 710 from the radio wave beacon signal processor 7 are transmitted simultaneously,
Set in advance either of the switching control signal to give priority. For example, the signal from the optical beacon signal processing unit 8 can be prioritized over the switching control signal from the radio wave beacon signal processing 7.

FIG. 3 is a flowchart for explaining the operation of the optical beacon signal processing section 8 when receiving an optical beacon according to the embodiment of the present invention. In FIG. 3, when the optical beacon signal processing unit 8 receives the downlink information (S01
1) At this point, since the switch 9 is not connected to the optical beacon side, the received light data is discarded (S012), and at the same time, the uplink information is emitted (S013). Upon detecting the uplink information, the light sensor emits downlink information including general additional information toward the vehicle.
The optical beacon signal processing unit 8 detects the general additional information in the downlink information (S014), and transmits a switch control signal 810 to the switch 9 to switch the switch 9 to the optical beacon side (S015).

After the switch 9 is switched, the optical beacon signal processing unit 8 transmits to the image processing apparatus 10 downlink information sequentially received via the switch 9 (S01).
8) Display the downlink information on the display 11 (S019). After displaying the downlink information, the optical beacon signal processing unit 8 transmits a switch control signal 810 to the switch 9 to switch the switch 9 to the GPS side (S0
20). The switch 9 switches to the GPS signal processing unit side to receive the GPS.

As described above, since the switch 9 is switched only after receiving a part of the downlink information from the photodetector, automatic switching is not performed without the photodetector. Accurate switching can be realized. Further, since it is not necessary to register map information or the like in advance, even if the installation location of the photodetector is changed, the switching accuracy does not deteriorate. It is independent of the level of sunlight, so it does not depend on the surrounding conditions such as season or weather. Furthermore, if the uplink is not established, the general additional information of the downlink that is not supplied from the photodetector is detected and automatic switching is performed, so that the in-vehicle terminal device transmits disturbance light to the downlink from the photodetector. Even if the data is erroneously recognized and an uplink is issued, if there is no photodetector on the in-vehicle terminal device, ID data cannot be obtained from the photodetector, so that automatic switching is not performed and incorrect switching is performed. Can be prevented.

FIG. 4 is a block diagram showing a vehicle-mounted terminal device according to the second embodiment. Reference numeral 12 denotes a memory unit. In FIG. 4, components that perform the same operations as those in the embodiment of FIG. 1 are denoted by the same reference numerals. In the embodiment shown in FIG. 4, the difference from the configuration shown in FIG.
Is further provided. In the embodiment shown in FIG. 1, the downlink information received before the switch 9 switches to the optical beacon side is discarded. In the present embodiment, the downlink information received before the switch 9 switches to the optical beacon side is discarded. After the information is temporarily stored in the memory 12 and the switch 9 is switched to the optical beacon side, the information stored in the memory 12 is transmitted via the optical beacon signal processing unit 8. According to the present embodiment, it is possible to secure a long time for receiving the downlink, so that it is possible to realize an in-vehicle terminal device with less information loss.

FIG. 5 shows a block diagram of an in-vehicle terminal device according to the third embodiment. Reference numeral 19 denotes a timer, and the same reference numerals in FIG. 5 denote the same parts as those in the first embodiment. The embodiment shown in FIG. 5 is different from the configuration shown in FIG. 1 in that the embodiment further includes a timer 13 that captures a vehicle speed signal.
If the vehicle is parked under roadside beacons or light detectors,
Once information is received, updated new information may be received one after another. In the embodiment shown in FIG. 5, after displaying the radio wave beacon information and the optical beacon information on the display 11, the timing at which the switch 9 is switched to the GPS signal processing unit 2 side is determined by the timer 13 which captures the vehicle speed signal.
Control. For example, the timer 13 detects that the vehicle is stopped, and sends a switching control signal 1310 for switching the switch 9 to the GPS signal processing unit 2 after a predetermined time has elapsed. If the vehicle stops under a roadside beacon or light sensor, switch 9
The optical beacon signal processor 8 or the radio beacon signal processor 7
It can last for a predetermined time while connected to the side, and then switch to the GPS side. Alternatively, the timer 1 may be connected to the optical beacon signal processing unit 8 or the radio wave beacon signal processing unit 7 without being stopped.
The switching control signal 1310 may be transmitted so as to switch to the GPS side after the elapse of a predetermined time according to No. 9. At this time,
The switching time may be changed according to the vehicle speed. FIG. 6 shows the processing in this case.

FIG. 6 is a flowchart for explaining the switching of the switch 9 using the timer 13 in the third embodiment. In FIG. 6, after displaying a radio wave or an optical beacon on the display 11 (S021), the timer 13 detects whether a predetermined time has elapsed (S022). This time setting is a function for setting the time shorter when the vehicle speed is fast and setting the time longer when the vehicle speed is slower in order to set the optimum time based on the vehicle speed signal captured by the timer 13. Is registered. When the elapse of the time set by the timer 13 is detected, a switch control signal 1310 is sent to switch the switch 9 to the GPS side (S023), and the GPS signal is received (S024).
According to the present embodiment, the switching time can be varied according to the vehicle speed.

FIG. 7 is a flowchart for explaining another method of switching the switch 9 in the third embodiment.

The flowchart shown in FIG. 7 is different from FIG. 6 in that when the timer 13 detects that a certain period of time has elapsed after switching to GPS, the radio beacon signal processor 7 or the optical beacon signal processor 8 is switched again. 9 is connected, and the position of the own vehicle can be confirmed by receiving GPS at regular time intervals, so that highly accurate position positioning can be realized. In FIG. 7, after receiving a radio wave or an optical beacon and displaying it on the display 11 (S031), the timer 1
In S3, it is detected whether a predetermined time has elapsed (S03).
2). This time setting is a function for setting the time shorter when the vehicle speed is fast and setting the time longer when the vehicle speed is slower in order to set the optimum time based on the vehicle speed signal captured by the timer 13. Is registered. Upon detecting that the time set by the timer 13 has elapsed,
Switch control signal 1 so that switch 9 is switched to the GPS side.
310 is transmitted (S033), and the GPS signal is received (S034). Further, the timer 13 detects whether a predetermined time has elapsed (S035). In this time setting, a sufficient time for receiving the GPS signal is registered. When it is detected that the time set by the timer 13 has elapsed, a switch control signal 1310 is sent to switch the switch 9 to the radio wave or optical beacon side (S
036), receive a radio wave or an optical beacon. According to the present embodiment, since the position of the own vehicle can be confirmed by receiving the GPS at regular time intervals, highly accurate position positioning can be realized.

According to each embodiment, the switch is switched only after receiving a part of the downlink information from the photodetector. Therefore, the automatic switching is not performed without the photodetector. Accurate switching can be realized. It is independent of the level of sunlight, so it does not depend on the surrounding conditions such as season or weather. Furthermore, if the uplink is not established, the general additional information that is not supplied from the photodetector is detected and automatic switching is performed, so that the in-vehicle terminal device mistakes the disturbance light with the downlink data from the photodetector. Even if it recognizes and issues an uplink, if there is no photodetector on the onboard terminal device, the ID
Since data cannot be obtained, automatic switching is not performed, and erroneous switching can be prevented.

[0033]

According to the present invention, an in-vehicle terminal device and an optical beacon receiver capable of further improving the accuracy of automatic switching can be realized.

[Brief description of the drawings]

FIG. 1 is a block configuration diagram of an in-vehicle terminal device according to a first embodiment of the present invention.

FIG. 2 is a flowchart illustrating a switch switching processing procedure;

FIG. 3 is a flowchart illustrating a switch switching processing procedure when an optical beacon is received.

FIG. 4 is a block configuration diagram of the vehicle-mounted terminal device according to the first embodiment of the present invention.

FIG. 5 is a block diagram of an in-vehicle terminal device according to the first embodiment of the present invention.

FIG. 6 is a flowchart illustrating a switch switching processing procedure.

FIG. 7 is a flowchart illustrating a switch switching processing procedure;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... GPS reception part, 2 ... GPS signal processing part, 3 ... optical beacon light receiving part, 4 ... optical beacon projection part, 6 ... radio beacon receiving part, 7 ... radio beacon signal processing part, 8 ... optical beacon signal processing part , 9 ... Switch section, 10 ... Image processing device, 1
1 ... Display, 12 ... Memory, 13 ... Timer

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04B 10/00 (72) Inventor Tomoyasu Fuse 2520 Takaba, Hitachinaka-shi, Ibaraki Automobile group Hitachi, Ltd. (72) Inventor Toshiyuki Sakamoto 2520 Takaba, Hitachinaka-shi, Ibaraki Pref.Hitachi, Ltd.Automotive Equipment Group (72) Inventor Atsushi Uchida 2477 Takaba, Hitachinaka-shi, Ibaraki Pref. Inventor Shiro Horii 2520 Takaba, Hitachinaka-shi, Ibaraki F-term in the Automotive Equipment Group, Hitachi, Ltd. (Reference) BB36 DD52 EE02 EE12 EE37 FF03 FF23 HH21 JJ52 JJ56

Claims (7)

[Claims] 1. A radio beacon signal receiving means for receiving a radio wave transmitted from a radio beacon installed on a roadside, a radio beacon signal processing means for processing a radio wave received by the radio beacon receiving means, and a radio beacon signal processing means installed on a roadside. Optical beacon receiving means for receiving an optical signal transmitted from the photodetector,
Optical beacon light emitting means for emitting an optical signal to be transmitted to the light detector, optical beacon signal processing means for performing signal processing on the optical signal, GPS receiving means for receiving a signal from an artificial satellite, and GPS receiving means GPS signal processing means for processing the signal received at the step, image processing means for performing image processing for display on the display means, the radio wave beacon signal processing means,
Switch means for switching the signal processed by the optical beacon signal processing means and the signal processed by the GPS signal processing means and transmitting the signal to the image processing means, wherein the optical beacon signal processing means performs signal processing of the optical signal. When detecting predetermined identification information from the photodetector, instructs the switch means to switch, the radio wave beacon signal processing means, when the radio wave is received, the radio beacon signal processing means And instructs the switch means to transmit a signal from the GPS signal processing means to the image processing means. The switch means transmits a signal processed by the GPS signal processing means to the image processing means, and the optical beacon signal When the processing unit is instructed to switch, the signal from the optical beacon signal processing unit is switched to be transmitted to the image processing unit, and the signal is transmitted to the image processing unit. Switching when instructed to bacon signal processing means, the vehicle-mounted terminal device and switches the signal from the radio beacon signal processing means to deliver to the image processing unit. 2. The in-vehicle terminal device according to claim 1, wherein a predetermined time has passed after said switch means switched to transmit a signal from said optical beacon signal processing means to said image processing means. An in-vehicle terminal device, further comprising timer means for instructing the switch means to send a signal from the GPS signal processing means to the image processing means. 3. The in-vehicle terminal device according to claim 2,
The timer means includes a switch control means for receiving a vehicle speed signal from a vehicle equipped with the on-board terminal device and changing the predetermined time according to the vehicle speed signal. In-vehicle terminal device. 4. The in-vehicle terminal device according to claim 1,
The optical beacon signal processing means further comprises a memory means for storing a signal obtained by processing the optical signal from the light sensor by the optical beacon signal processing means, wherein the memory means is configured to switch the switch means by the optical beacon signal processing means. And outputting the signal stored in the memory means. 5. The in-vehicle terminal device according to claim 1, wherein said radio wave beacon signal processing means issues said instruction when receiving a radio wave having a predetermined electric field intensity. 6. An optical beacon receiving means for receiving an optical signal transmitted from an optical detector installed on a roadside, an optical beacon emitting means for emitting an optical signal to be transmitted to the optical sensor, and the optical signal Optical beacon signal processing means for performing signal processing of the above, GPS receiving means for receiving a signal from an artificial satellite, GPS signal processing means for processing a signal received by the GPS receiving means, and image processing for displaying on the display means Processing means, and the optical beacon signal processing means and the GP
Switching means for switching the signals processed by the S signal processing means and sending the processed signals to the image processing means, wherein the optical beacon signal processing means determines a predetermined signal from the photodetector in the signal processing of the optical signal. When the identification information is detected, the switching means is instructed to switch, the switch means sends a signal processed by the GPS signal processing means to the image processing means, and the optical beacon signal processing means Wherein the switching is transmitted so that the signal from the optical beacon signal processing means is transmitted to the image processing means when the switching instruction is issued. 7. An optical beacon light receiving means for receiving an optical signal transmitted from an optical sensor installed on a roadside, an optical beacon emitting means for emitting an optical signal to be transmitted to the optical sensor, and the optical signal Optical beacon signal processing means for performing signal processing of, when the optical beacon signal processing means detects predetermined identification information from the photodetector in the signal processing of the optical signal, a switching signal An optical beacon receiver characterized by outputting.