JP2011076347A - Road-vehicle communication system and in-vehicle device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a road-vehicle communication system for transmitting different information to each direction of crossing roads, and transmitting information depending on a vehicle approach angle. <P>SOLUTION: The road-vehicle communication system includes a vehicle equipped with an in-vehicle device, and roadside equipment. A transmission control part provided to the roadside equipment creates transmission information to be transmitted to the vehicle depending on the vehicle approach angle. The transmission control part creates and transmits the relation information obtained by associating the approach angle corresponding to the transmission information with the transmission information. A reception control part provided in the in-vehicle device controls an electric wave receiving device to receive the electric waves. An angle calculation part provided in the in-vehicle device calculates the approach angle of the vehicle with respect to a road having the roadside equipment using a GPS device. An information extraction part provided in the in-vehicle device acquires the relation information included in the received electric waves, calculates the approach angle by the angle calculation part, and extracts the transmission information associated with the calculated approach angle from the relation information. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a road-to-vehicle communication system and an in-vehicle device for delivering information from a roadside machine to a vehicle, and in particular, the in-vehicle device that has received the information extracts only the information necessary for the vehicle. The present invention relates to a road-to-vehicle communication system and a vehicle-mounted device.

  In recent years, road-to-vehicle communication systems that provide various services by performing communication between a roadside device installed on the roadside and an in-vehicle device mounted on the vehicle have been put into practical use. In particular, using an information communication technology called ITS (Intelligent Transport System), a system that uses various types of information among pedestrians, vehicles, and roadside machines is being developed.

  ITS is mainly aimed at improving safety, transportation efficiency and comfort. Specifically, for example, an automatic toll collection system, driving support, optimization of traffic management, efficiency of road management, emergency vehicle operation support, and the like are considered. As a typical system, an ETC (Electronic Toll Collection) on a highway has been put into practical use.

  As a technique for realizing the above service, there is vehicle-to-vehicle communication in which vehicles communicate with each other using a wireless communication device mounted on the vehicle. In addition, there is road-to-vehicle communication in which a roadside device, which is a wireless communication device installed on the side of a road, and the vehicle wireless communication device communicate with each other.

  In relation to the above, Patent Document 1 discloses a mobile communication system aimed at maintaining a stable connection state with respect to communication between vehicles and road vehicles. This system includes means for relaying and transferring communication by a mobile radio station mounted on a vehicle by adding information to a header. As a result, even when there is a shield or the like between the communication partner, the communication state is maintained by relay transfer by another mobile radio station.

  Patent Document 2 discloses a communication start order setting system for the purpose of reducing interference in inter-vehicle communication. This system includes a first communicator that transmits a request signal that can identify one vehicle among a plurality of vehicles as a vehicle-to-vehicle communication start vehicle. Moreover, the 2nd communication apparatus provided in each vehicle is included.

  The vehicle uses the request signal received by the second communicator to determine whether or not the vehicle is authorized to start communication for inter-vehicle communication. Only when the right to start communication is given, the vehicle information is transmitted from the transmitter to the other vehicle to perform inter-vehicle communication. Thereby, the communication amount is reduced.

  Patent Document 3 discloses a system that provides information unique to a fixed point on a road. In this system, a transmission medium for recognizing a point is attached to a structure on or near a road. When the vehicle passes this point, this point is detected by a detection device mounted on the vehicle using a transmission medium such as magnetism, radio waves, sound waves, and light.

  Furthermore, the GPS receiver measures the latitude and longitude of this point, searches the information base mounted on the vehicle for the accompanying information of this point by latitude and longitude, and provides it to the driver. Alternatively, only the identification number is retrieved and provided as accompanying information. In this case, the other accompanying information is provided together with accompanying information of a plurality of points by road-to-vehicle communication.

JP 2008-219409 A JP 2008-131456 A JP 2001-357493 A

  However, Patent Literature 1 to Patent Literature 3 disclose improvement in communication accuracy in a road-to-vehicle communication system, efficiency in providing information, and multi-functionality, but disclosure of simplification of system components is also disclosed. There is no suggestion.

  In general, in a road-to-vehicle communication system, it is necessary to previously record map information common to both the roadside device and the receiving side. Also, for road link IDs, information generated based on common rules must be recorded in both. For this reason, vehicles that can use the system are limited, which is disadvantageous in terms of versatility.

  The present invention has been made in view of the above problems, and in a road-to-vehicle communication system that transmits information from a roadside machine installed at one intersection to a vehicle, information on contents that differ in each direction of the intersecting road is provided. To provide a road-to-vehicle communication system and an in-vehicle device capable of transmitting information that can be transmitted to a vehicle that does not have map information according to the approach angle of the vehicle. is there.

  In order to achieve the above object, a road-to-vehicle communication system according to the present invention transmits a vehicle equipped with a vehicle-mounted device including a radio wave receiver and a GPS (Global Positioning System) device, and radio waves that can be received by the radio wave receiver. In a road-to-vehicle communication system including a roadside machine equipped with a radio wave transmitting device, transmission information that is information that the roadside machine transmits to the vehicle according to an approach angle of the vehicle with respect to a road where the roadside machine is installed. Generating, generating relation information indicating a correspondence relation between the approach angle corresponding to the transmission information and the transmission information, and controlling the radio wave transmission device to transmit the radio wave including the transmission information and the relation information A control unit, wherein the in-vehicle device controls the radio wave receiving device so as to receive the radio wave; and an angle of approach of the vehicle with respect to the road is determined by the GPS When the radio wave is received by an angle calculation unit that calculates using a device and the reception control unit, the relation information included in the radio wave is acquired, the approach angle is calculated by the angle calculation unit, and calculated And an information extraction unit that extracts the transmission information related to the entered approach angle from the relationship information.

  According to this configuration, the road-to-vehicle communication system of the present invention includes a vehicle on which a vehicle-mounted device including a radio wave receiver and a GPS device is mounted. Moreover, the roadside machine provided with the radio wave transmitter which transmits the radio wave which a radio wave receiver can receive is included. The transmission control unit included in the roadside machine generates transmission information that is information to be transmitted to the vehicle in accordance with the approach angle of the vehicle with respect to the road where the roadside machine is installed. And the relationship information which linked | related the approach angle and transmission information corresponding to transmission information is produced | generated. Then, the radio wave transmitting device is controlled to transmit radio waves including the related information. Moreover, the reception control part with which a vehicle-mounted apparatus is equipped controls a radio wave receiver so that the radio wave from a roadside machine may be received. Moreover, the angle calculation part with which a vehicle-mounted apparatus is equipped calculates the approach angle of the vehicle with respect to the road where the roadside machine was provided using a GPS apparatus. The information extraction unit included in the in-vehicle device acquires relation information included in the radio wave when the radio wave is received by the reception control unit, calculates the approach angle by the angle calculation unit, and relates to the calculated approach angle. The attached transmission information is extracted from the related information. Thereby, the in-vehicle device on the receiving side can extract only transmission information necessary for the own vehicle according to the traveling direction of the own vehicle.

  In order to achieve the above object, in the road-to-vehicle communication system according to the present invention, the in-vehicle device generates an image or a sound indicating the transmission information extracted by the display unit or the sound output unit and the information extraction unit. And a notification unit that controls the display unit or the audio output unit to output the image or the audio.

  According to this configuration, the in-vehicle device includes the display unit or the audio output unit. Moreover, the information part is provided with the alerting | reporting part which produces | generates the image or sound which shows the transmission information extracted, and controls a display part or an audio | voice output part so that the produced | generated image or sound may be output. Thereby, the in-vehicle device on the receiving side can perform only necessary notification to the driver of the own vehicle according to the traveling direction of the own vehicle.

  In order to achieve the above object, in the road-to-vehicle communication system of the present invention, the transmission control unit divides the approach angle of the vehicle with respect to the road into four ranges every 90 degrees, and each of the divided four ranges. The relation information is generated by associating the transmission information with the information, and the information extraction unit determines which of the four ranges includes the approach angle calculated by the angle calculation unit. The transmission information related to one range is extracted from the relationship information.

  According to this configuration, the transmission control unit included in the roadside unit divides the approach angle of the vehicle with respect to the road into four ranges every 90 degrees, and associates the transmission information with each of the divided four ranges, thereby obtaining the relationship information. Generate. In addition, the information extraction unit included in the in-vehicle device determines which of the four ranges includes the angle calculated by the angle calculation unit, and transmits the transmission information related to the determined one range from the relationship information. Extract.

  In order to achieve the above object, in the road-to-vehicle communication system according to the present invention, the transmission control unit and the relationship information are based on the traffic situation of the road acquired by the transmission control unit using ITS (Intelligent Transportation Systems). Is generated.

  According to this structure, the transmission control part with which a roadside machine is provided produces | generates transmission information and relationship information based on the traffic condition acquired using ITS, for example, the number of vehicles in the vicinity of the intersection detected by road-to-vehicle communication.

  In order to achieve the above object, the vehicle-mounted device according to the present invention is a vehicle-mounted device including a radio wave receiving device and a GPS device, and from the road-side device to the vehicle according to the approach angle to the road where the road-side device is provided. A reception control unit that controls the radio wave receiving apparatus to receive radio waves including relation information indicating correspondence relation between transmission information that is information to be transmitted and the approach angle corresponding to the transmission information; and When the radio wave is received by the angle calculation unit that calculates an approach angle of the vehicle using the GPS device, and the reception control unit, the relation information included in the radio wave is acquired, and the angle calculation unit An information extraction unit that calculates the approach angle and extracts the transmission information related to the calculated approach angle from the relationship information is provided.

  In order to achieve the above object, the vehicle-mounted device of the present invention generates a display unit or an audio output unit and an image or audio indicating the transmission information extracted by the information extraction unit, and the image or audio And a notification unit that controls the display unit or the audio output unit.

  In order to achieve the above object, in the vehicle-mounted device according to the present invention, the relation information is obtained by dividing the approach angle of the vehicle with respect to the road into four ranges every 90 degrees, and the transmission information in each of the four ranges. The information extraction unit determines which of the four ranges includes the approach angle calculated by the angle calculation unit, and is related to the determined one range. The transmission information is extracted from the related information.

  According to this configuration, an action equivalent to that of the in-vehicle device included in the road-to-vehicle communication system described above can be obtained.

  According to the present invention, the transmission information corresponding to the vehicle approach angle to the intersection is stored in the information transmitted from the roadside unit to the vehicle, and transmitted in all directions. Further, the receiving vehicle calculates the angle of approaching the intersection by the GPS device, extracts and notifies the transmission information necessary for the own vehicle. For this reason, even if the vehicle receives the same information, different contents can be notified according to the approach angle.

  According to the present invention, the receiving vehicle calculates the approach angle using the GPS device, and extracts necessary information from the received information. For this reason, it is not necessary to give common map information, management ID, etc. to both a roadside machine and a vehicle-mounted apparatus, and to perform transmission / reception management for every vehicle. Even if the vehicle does not have a navigation function, it is possible to carry out notification according to the approach angle to the intersection.

  According to the present invention, transmission information is broadcast in four directions at an intersection using a single roadside device. For this reason, compared with the case where four roadside machines are provided with respect to the vehicle which drive | works a four-way road, it is advantageous in terms of cost.

It is a block diagram which shows the apparatus structure of the vehicle-mounted apparatus of this invention. It is a block diagram which shows the apparatus structure of the information processing apparatus of this invention. It is a block diagram which shows the system configuration | structure of the road-vehicle communication system of this invention. It is a table figure which shows the structure of relationship information. It is the schematic diagram which showed the road condition typically. It is a flowchart which shows the reception process of related information.

Embodiments of the present invention will be described below with reference to the drawings. In addition, embodiment shown here is an example and this invention is not limited to embodiment shown here.
<1. Configuration of Road-to-Vehicle Communication System>
FIG. 3 is a block diagram showing a configuration of a road-vehicle communication system according to an embodiment of the present invention. This system is configured to include at least a vehicle 1, a roadside device 2, and a GPS satellite 3.

  The vehicle 1 is a vehicle on which an in-vehicle device 100 described later is mounted, and is used for traveling on a road on which the roadside device 2 is provided.

  The roadside machine 2 is a transmitter that is provided on the roadside and transmits predetermined information to the in-vehicle device 100 mounted on the vehicle 1. The roadside machine 2 includes an information processing device 200 therein. The information processing apparatus 200 performs various types of information processing for generating, recording, and transmitting road-to-vehicle communication information (FIG. 4) described later. Details of the information processing apparatus 200 will be described later.

The GPS satellite 3 is arranged on the satellite orbit and transmits a specific radio wave (for example, an L1 radio wave of 1.575 GHz) to a ground GPS receiver. Thereby, various information for calculating the position information, for example, coordinate information of the GPS satellite 3, time information for measuring the propagation time of the radio wave, and the like are transmitted.
<2. About configuration of in-vehicle device>
FIG. 1 is a block diagram showing an internal configuration of a vehicle-mounted device 100 according to an embodiment of the present invention. The in-vehicle device 100 of the present embodiment is an electronic device that is mounted on the vehicle 1 and constitutes a part of the road-vehicle communication system.

  As shown in the block diagram of FIG. 1, the in-vehicle device 100 of the present invention includes at least a control unit 11, a GPS antenna 12 (= GPS device), a positioning navigation device 13 (= GPS device), and an LCD (Liquid Crystal Display) 14. (= Display unit), display control unit 15, operation unit 16, speaker 17 (= audio output unit), flash memory 18, antenna 19 (= radio wave receiving device), and communication control unit 20 (= radio wave receiving device) It is configured as follows.

  The control unit 11 organically controls the driving of each member of the in-vehicle device 100, and performs overall control of traffic information acquisition processing, display processing, and the like. Moreover, the control part 11 is provided with the reception control part 11a-notification part 11d as a function part implement | achieved by running a predetermined | prescribed program on the arithmetic processing apparatus with which the control part 11 is provided. Details of processing performed by each functional unit will be described later.

  The GPS antenna 12 is a receiver for receiving a specific radio wave (for example, an L1 radio wave of 1.575 GHz) emitted from the GPS satellite 3. The GPS antenna 12 can receive a signal including coordinate information of each GPS satellite 3 from a plurality of GPS satellites 3.

  The positioning navigation apparatus 13 is an apparatus including a positioning apparatus that decodes a signal received by the GPS antenna 12 to generate latitude / longitude information, and a navigation apparatus that generates speed information and attitude angle information using a gyro and a vehicle speed sensor.

  The LCD 14 is a device that displays various information held by the navigation device 100, such as traffic information and a menu screen. The display control unit 15 encodes the image information into a signal that matches the signal format of the LCD 14, performs D / A conversion, and outputs an image signal. The image signal output from the display control unit 15 is sent to the LCD 14 and displayed as an image.

  The operation unit 16 is an input interface for the driver of the vehicle 1 to perform various instructions to the navigation device 100, for example, destination input. The operation unit 16 is configured to include, for example, a plurality of push buttons, touch sensors, and the like. Alternatively, an operation input may be received by providing a touch panel on the surface of the LCD 14.

  The speaker 17 is an audio output device that outputs audio including various information to a passenger of the vehicle 1. Especially in this embodiment, it is used for outputting a notification sound when the vehicle 1 approaches an intersection.

  The memory 18 is a medium for recording various information. The memory 18 is used for recording, for example, map information used for navigation processing and voice information. Moreover, in this embodiment, it is used for recording the traffic information etc. which were received from the roadside machine 2. FIG.

The antenna 19 is for receiving radio waves transmitted from the roadside device 2, and for example, a plurality of diversity antennas are used. The communication control unit 20 demodulates radio waves received by the antenna 19. The communication control unit 20 may also have a transmission control function for transmitting radio waves using the antenna 19.
<3. Configuration of information processing device>
FIG. 2 is a block diagram showing an internal configuration of the information processing apparatus 200 according to an embodiment of the present invention. Note that the information processing apparatus 200 of the present embodiment is an electronic device that is built in the roadside device 2 and forms part of the road-vehicle communication system.

  As shown in the block diagram of FIG. 2, the information processing apparatus 200 of the present invention includes at least a control unit 21, a memory 22, an antenna 23 (= radio wave transmission device), and a communication control unit 24 (= radio wave transmission device). It is configured.

  The control unit 21 organically controls the driving of each member of the information processing apparatus 200 and performs overall control of traffic information generation processing, transmission processing, and the like. Further, the control unit 21 includes a transmission control unit 21a as a functional unit realized by executing a predetermined program on the arithmetic processing device provided in the control unit 21. The details of the process performed by the transmission control unit 21a will be described later.

  The memory 22 is a medium for recording various information. The memory 22 is used, for example, for recording road-to-vehicle communication information to be transmitted to the vehicle 1, road traffic information, and the like.

The antenna 23 is a transmitter that transmits a radio wave having a frequency that can be received by the antenna 19 mounted on the vehicle 1. The communication control unit 24 performs modulation processing of information transmitted using the above-described radio waves and transmission control of radio waves transmitted by the antenna 23.
<4. About Road-to-Vehicle Communication Information>
FIG. 4 is a table showing an example of road-to-vehicle communication information (= relation information) used in the road-to-vehicle communication system according to the embodiment of the present invention. Road-to-vehicle communication information is generated by the transmission control unit 21a of the roadside device 2.

  As shown in FIG. 4, the road-to-vehicle communication information of the present embodiment has a structure in which two items of “entry angle” and “information content” are associated with each other. “Entry angle” indicates an angle at which the vehicle 1 enters the road on which the roadside machine is installed. “Information content” indicates transmission information for the vehicle 1 that has received the road-to-vehicle communication information to notify the driver.

  In the following description, the road where the roadside machine is installed will be described as an intersection. However, the road need not be limited to the intersection as long as the roadside machine is installed.

  The “entrance angle” is set in advance for each roadside machine 2 because the classification of the approach angle as viewed from the roadside machine 2 is different for each intersection. In the present embodiment, it is assumed that north is 0 degree and the clockwise direction is expressed from 0 degree to 359 degrees. Then, as shown in FIG. 5, the approach angle of the crossing intersection is divided into four equal parts. The approach angle is divided into 45 degrees to 134 degrees, 135 degrees to 224 degrees, 225 degrees to 314 degrees, and 315 degrees to 44 degrees.

  In the example of FIG. 5, the vehicle 1 a is about to enter the intersection where the roadside machine 2 is provided from a direction of 180 degrees. The vehicle 1b is about to enter from a direction of 90 degrees. Therefore, it is necessary to notify the vehicle 1a that another vehicle is approaching from the right. Further, it is necessary to notify the vehicle 1b that another vehicle is approaching from the left.

  The transmission control unit 21a of the roadside device 2 that has detected the above traffic situation by ITS or the like generates the transmission information included in the “information content” as shown in FIG. 4 based on the detection result. In this embodiment, since the approach angle is managed by being divided into four parts every 90 degrees, transmission information to be included in the four “information contents” is generated.

  The transmission control unit 21a transmits road-to-vehicle communication information including the generated transmission information using a 700 MHz band radio wave or the like. Note that the above transmission processing is performed by broadcast transmission from the roadside device 2 to the surrounding vehicle 1 every 100 milliseconds, for example. The propagation distance is several hundred meters.

Receiving this, the vehicle 1 performs a notification process using the received road-vehicle communication information. Details of this notification processing will be described next.
<5. Notification process using road-to-vehicle communication information>
Here, the outline | summary of the alerting | reporting process which the vehicle-mounted apparatus 100 which concerns on one Embodiment of this invention implements is demonstrated, using the flowchart of FIG. The processing flow shown in FIG. 6 is started when the in-vehicle apparatus 100 is in an operating state.

  After the start of this process, in step S110, the reception control unit 11a determines whether or not the antenna 19 has received a predetermined radio wave including road-to-vehicle communication information from the roadside device 2. If reception of radio waves is not detected, that is, if the vehicle is not located near the intersection where the roadside unit 2 is provided, the process proceeds to step S110 again and monitoring is continued.

  When reception of radio waves is detected, the angle calculation unit 11b acquires position information using the GPS antenna 12 and the positioning navigation device 13 in step S120. Furthermore, the angle calculation part 11b calculates the approach angle with respect to the intersection where the roadside machine 2 was provided from the acquired positional information in step S130.

  For example, when the vehicle 1 is traveling northward, the vehicle 1a is in the state shown in FIG. 5, so the approach angle is 180 degrees. Further, when the vehicle 1 is traveling while moving west, the vehicle 1b shown in FIG. 5 is brought into the state, so the approach angle is 90 degrees.

  Next, in step S140, the information extraction unit 11c refers to the approach angle calculated above and the road-to-vehicle communication information shown in FIG. 4, and extracts transmission information used for notification.

  For example, in the example of FIG. 5, the vehicle 1a has an approach angle of 180 degrees, that is, within a range of 135 degrees to 224 degrees. Therefore, in the vehicle 1a, “car comes from the right” in the second row is extracted as the transmission information. Is done. Further, since the vehicle 1b has an approach angle of 90 degrees, that is, in the range of 45 degrees to 134 degrees, "car comes from the left" on the first line is extracted as the transmission information.

  Next, in step S150, the notification unit 11d performs notification using the transmission information extracted by the information extraction unit 11c. For example, a text image indicating the transmission information is generated and displayed on the LCD 14. Alternatively, sound indicating the transmission information is generated and output from the speaker 17. When the notification is completed, the process proceeds to step S110 again.

  Note that when the transmission information extracted by the information extraction unit 11c is empty information, that is, when no information is included in the “information content” in FIG. The form which alert | reports a message may be sufficient. For example, “no approaching vehicle” is used as the fixed message.

  According to the embodiment described above, the transmission information divided according to the approach angle to the intersection is stored in the road-to-vehicle communication information transmitted from the roadside machine 2, and transmitted in all directions. The vehicle 1 on the receiving side calculates the angle to enter the intersection by the positioning navigation device 13 or the like, and extracts and notifies only the transmission information necessary for the own vehicle.

For this reason, in vehicles traveling in each direction of the intersection, different contents can be notified according to the traveling direction. Moreover, it is not necessary to give common map information, traffic information management ID, etc. to both the roadside machine 2 and the vehicle-mounted apparatus 100. For this reason, even if it is a case where in-vehicle device 100 is not provided with a navigation function, it is possible to carry out notification according to the approach angle to the intersection.
[Other embodiments]
The present invention has been described with reference to the preferred embodiments and examples. However, the present invention is not necessarily limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea. be able to.

  Therefore, the present invention can also be applied to the following embodiments.

  (A) In the above embodiment, the various functional units of the in-vehicle apparatus 100 and the information processing apparatus 200 related to various processes of the present invention are realized by executing predetermined programs on an arithmetic processing apparatus such as a microprocessor. However, various functional units may be realized by a plurality of circuits.

  (B) In the embodiment described above, the GPS device is stored in the navigation device 100 as an example, but it is not always necessary to have the same casing. For example, the navigation device 100 and the GPS device may include a communication unit and perform data transfer via the communication unit to perform the same operation as described above.

  (C) In the above embodiment, an example of an intersection is described as an example of a point where notification using road-to-vehicle communication information is performed. However, notification according to an approach angle is performed on a road having a shape other than this. The form to perform may be sufficient. For example, it may be implemented on a three-way road or a road under construction.

  (D) In the above embodiment, transmission information and road-to-vehicle communication information are generated from the traffic situation detected by the transmission control unit 21a using ITS, but the traffic situation may be detected by other means. For example, the roadside machine 2 may be provided with an image pickup device, picking up a road and analyzing the picked-up image to detect the traffic situation. Further, the roadside device 2 may include a communication unit that can be connected to a wide area communication network, and may detect a traffic situation via the wide area communication network.

  (E) In the above embodiment, the generation and transmission of road-to-vehicle communication information performed by the transmission control unit 21a is performed every predetermined period. However, the generation of road-to-vehicle communication information is performed only when the vehicle 1 is detected, and a new As long as the vehicle 1 is not detected, only transmission may be performed every predetermined period.

  (F) In the above embodiment, it is described that the GPS device is used to calculate the approach angle, but in addition to this, positioning by WiFi (wireless LAN), positioning by a mobile phone or a PHS base station, and further by an electronic compass Positioning (azimuth calculation) can also be used.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Roadside machine 3 GPS satellite 100 In-vehicle apparatus 11 Control part 11a Reception control part 11b Angle calculation part 11c Information extraction part 11d Notification part 12 GPS antenna (GPS apparatus)
13 Positioning navigation device (GPS device)
14 LCD (display unit)
15 Display Control Unit 16 Operation Unit 17 Speaker (Audio Output Unit)
18 Memory 19 Antenna (Radio wave receiver)
20 Communication control unit (Radio wave receiver)
200 Information processing device 21 Control unit 21a Transmission control unit 22 Memory 23 Antenna (Radio wave transmission device)
24 Communication control unit (Radio wave transmitter)

Claims (7)

In a road-to-vehicle communication system including a vehicle equipped with a vehicle-mounted device including a radio wave receiver and a GPS (Global Positioning System) device, and a roadside device including a radio wave transmitter that transmits radio waves that can be received by the radio wave receiver.
The roadside machine generates transmission information that is information transmitted to the vehicle according to an approach angle of the vehicle with respect to a road on which the roadside machine is installed, and the approach angle corresponding to the transmission information and the transmission information A transmission control unit that controls the radio wave transmission device to generate the relation information indicating the correspondence relationship between the transmission information and the radio wave including the transmission information and the relation information,
A reception control unit that controls the radio wave receiving device so that the in-vehicle device receives the radio wave;
An angle calculation unit for calculating an approach angle of the vehicle with respect to the road using the GPS device;
When the radio wave is received by the reception control unit, the relation information included in the radio wave is acquired, the approach angle is calculated by the angle calculation unit, and is related to the calculated approach angle. A road-to-vehicle communication system comprising: an information extraction unit that extracts the transmission information from the relationship information. The on-vehicle device includes a display unit or an audio output unit,
An image or sound indicating the transmission information extracted by the information extraction unit, and a notification unit for controlling the display unit or the sound output unit to output the image or the sound,
The road-to-vehicle communication system according to claim 1. The transmission control unit divides the approach angle of the vehicle with respect to the road into four ranges every 90 degrees, and generates the relationship information by associating the transmission information with each of the divided four ranges,
The information extraction unit determines in which of the four ranges the approach angle calculated by the angle calculation unit is included, and the transmission information related to the determined one range is determined from the relationship information. Extract,
The road-to-vehicle communication system according to claim 1. The transmission control unit generates the transmission information and the relationship information based on the traffic situation of the road acquired using ITS (Intelligent Transportation Systems).
The road-to-vehicle communication system according to claim 1. In a vehicle-mounted device including a radio wave receiver and a GPS device,
Including transmission information, which is information transmitted from the roadside machine to the vehicle in accordance with an entry angle to the road where the roadside machine is provided, and relationship information indicating a correspondence relation between the entry angle corresponding to the transmission information A reception control unit that controls the radio wave receiving device to receive radio waves;
An angle calculation unit for calculating an approach angle of the vehicle with respect to the road using the GPS device;
When the radio wave is received by the reception control unit, the relation information included in the radio wave is acquired, the approach angle is calculated by the angle calculation unit, and is related to the calculated approach angle. An in-vehicle device, comprising: an information extraction unit that extracts the transmission information from the relationship information. A display unit or an audio output unit;
An image or sound indicating the transmission information extracted by the information extraction unit, and a notification unit for controlling the display unit or the sound output unit to output the image or the sound,
The in-vehicle device according to claim 5. The relationship information has a configuration in which the approach angle of the vehicle with respect to the road is divided into four ranges every 90 degrees, and the transmission information is related to each of the four ranges,
The information extraction unit determines in which of the four ranges the approach angle calculated by the angle calculation unit is included, and the transmission information related to the determined one range is determined from the relationship information. Extract,
The in-vehicle device according to claim 5.

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