JP2020009175A - Wireless communication device and vehicle monitor program - Google Patents

Abstract

To provide a wireless communication device and a vehicle monitor program capable of providing information according to a traveling state of a vehicle.SOLUTION: An arrival direction measurement portion 121 measures the arrival direction of a radio wave transmitted from an on-vehicle device. A traveling state detection portion 122 detects a traveling state of a vehicle equipped with the on-vehicle device on the basis of a plurality of arrival directions measured during a sampling time. An information providing portion 123 transmits alert information according to the traveling state to the on-vehicle device.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a wireless communication device for detecting a traveling state of a vehicle.

Area-specific information is provided to vehicles that have entered the communication area.
However, information according to the traveling state of the vehicle, such as a warning when changing lanes or a warning when performing meandering driving, is not provided.

Patent Literature 1 discloses a technique for determining a direction of arrival of a radio wave from a passing vehicle to determine a vehicle to be charged.
However, Patent Literature 1 does not disclose provision of information according to the traveling state of a vehicle.

JP 2000-298747 A

  SUMMARY OF THE INVENTION It is an object of the present invention to provide information according to a running condition of a vehicle.

The wireless communication device according to the present invention includes:
An arrival direction measurement unit that measures an arrival direction of a radio wave transmitted from the vehicle-mounted device,
A traveling state detection unit that detects a traveling state of a vehicle equipped with the on-vehicle device based on a plurality of arrival directions measured during a sampling time.

  According to the present invention, it is possible to detect a traveling state of a vehicle. Therefore, it is possible to provide information according to the traveling state of the vehicle.

FIG. 1 is a configuration diagram of a vehicle monitoring system 200 according to the first embodiment. FIG. 1 is a configuration diagram of a wireless communication device 100 according to Embodiment 1. FIG. 2 is a configuration diagram of an antenna of the wireless communication device 100 according to the first embodiment. 5 is a flowchart of a vehicle monitoring method according to the first embodiment.

  In the embodiments and the drawings, the same elements and corresponding elements are denoted by the same reference numerals. Descriptions of the elements denoted by the same reference numerals are omitted or simplified as appropriate. The arrows in the figure mainly indicate the flow of data or the flow of processing.

Embodiment 1 FIG.
An embodiment in which information according to the traveling state of the vehicle is provided to the vehicle will be described with reference to FIGS.

*** Configuration description ***
The configuration of the vehicle monitoring system 200 will be described based on FIG.
In FIG. 1, a vehicle 210A changes lanes from an overtaking lane to a traveling lane. On-vehicle device 211A is mounted on vehicle 210A. Vehicle 210B travels in the traveling lane. On-vehicle device 211B is mounted on vehicle 210B.
When the vehicles are not specified, each is referred to as a vehicle 210.
When the vehicle-mounted devices are not specified, each of them is referred to as a vehicle-mounted device 211.
For example, the vehicle-mounted device 211 is an ETC vehicle-mounted device. ETC is an abbreviation for Electronic Toll Collection System.

The vehicle-mounted device 211 transmits a radio wave periodically. The radio wave transmitted from the vehicle-mounted device 211 in the communication area reaches the wireless communication device 100 and is received by the wireless communication device 100.
In FIG. 1, each of a plurality of white circles arranged in a line indicates a position of the vehicle 210 when a radio wave is transmitted from the vehicle-mounted device 211.

The vehicle monitoring system 200 includes the wireless communication device 100 and a management device 220.
When the vehicle 210 enters the communication area of the wireless communication device 100, the wireless communication device 100 measures the arrival direction of the radio wave transmitted from the vehicle-mounted device 211. Then, wireless communication apparatus 100 detects the traveling state of vehicle 210 based on the plurality of arrival directions measured during the sampling time.
Further, wireless communication apparatus 100 transmits traveling state information indicating the traveling state of vehicle 210 to management apparatus 220, receives the alert information from management apparatus 220, and transmits the alert information to vehicle-mounted device 211. The alert information is information according to the driving situation.
The management device 220 receives the traveling state information from the wireless communication device 100 and transmits the alert information to the wireless communication device 100.

For example, the vehicle monitoring system 200 operates as follows.
Vehicle 210A and vehicle 210B enter the communication area.
The wireless communication device 100 measures the arrival direction of the radio wave from the vehicle-mounted device 211A a plurality of times during the sampling time. Next, wireless communication apparatus 100 detects a lane change of vehicle 210A based on the plurality of measured directions of arrival. Next, the wireless communication device 100 transmits traveling state information indicating a lane change to the management device 220, and receives alert information for preventing collision from the management device 220. Then, wireless communication apparatus 100 transmits alert information for preventing collision to the communication area.
The in-vehicle device 211A and the in-vehicle device 211B receive the alert information for collision prevention and output the alert information for collision prevention.
Thus, alert information for preventing collision is provided to the driver of vehicle 210A and the driver of vehicle 210B.

The configuration of the wireless communication device 100 will be described based on FIG.
The wireless communication device 100 includes a plurality of angle measuring antennas 101. 2, the wireless communication device 100 includes four angle measuring antennas 101.
The angle measurement antenna 101 is an antenna for measuring the arrival direction of a radio wave transmitted from the vehicle-mounted device 211.

The wireless communication device 100 includes a communication antenna 102.
The communication antenna 102 is an antenna for communicating with the vehicle-mounted device 211 and the management device 220.

The wireless communication device 100 includes a wireless communication circuit 110.
The wireless communication circuit 110 includes a plurality of receiving units 111 connected to the plurality of angle measuring antennas 101.
The plurality of receiving units 111 receive radio waves that have reached the plurality of angle measuring antennas 101.

The wireless communication circuit 110 includes a diplexer 112, a transmitting unit 113, a receiving unit 114, and a modem 115.
The diplexer 112 is connected to the communication antenna 102 and performs transmission and reception using the communication antenna 102. The diplexer 112 is also called a transmission / reception separator.
The transmitting unit 113 transmits a signal via the diplexer 112. The transmitted signal is referred to as a transmission signal.
The receiving unit 114 receives a signal via the diplexer 112. The received signal is called a received signal.
Modulation / demodulation section 115 modulates an information signal into a transmission signal and demodulates a reception signal into an information signal. The information signal is a signal indicating information.

The wireless communication device 100 includes a processing circuit 120. In addition, the wireless communication device 100 includes elements such as an arrival direction measuring unit 121, a traveling state detecting unit 122, and an information providing unit 123.
The processing circuit 120 is hardware that implements the direction-of-arrival measuring unit 121, the traveling state detecting unit 122, and the information providing unit 123.
The processing circuit 120 may be dedicated hardware, or may be a set of a memory and a processor that executes a vehicle monitoring program stored in the memory. The vehicle monitoring program is a program for causing a computer to function as the direction-of-arrival measuring unit 121, the traveling state detecting unit 122, and the information providing unit 123. The vehicle monitoring program can be computer-readablely recorded (stored) in a non-volatile recording medium.
When the processing circuit 120 is dedicated hardware, the processing circuit 120 is, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof.
ASIC is an abbreviation for Application Specific Integrated Circuit, and FPGA is an abbreviation for Field Programmable Gate Array.
In the processing circuit 120, some functions may be realized by dedicated hardware, and the remaining functions may be realized by software or firmware.
Thus, the processing circuit 120 can be realized by hardware, software, firmware, or a combination thereof.

The configuration of the antenna provided in the wireless communication device 100 will be described based on FIG.
The wireless communication device 100 includes a plurality of patch antennas 103. The plurality of patch antennas 103 are arranged in a grid. In FIG. 3, the wireless communication apparatus 100 includes 64 (= 8 × 8) patch antennas 103.
Some of the plurality of patch antennas 103 are used as the plurality of angle measurement antennas 101, and the remaining patch antennas 103 are used as the communication antennas 102. In FIG. 3, four patch antennas 103 are used as four angle measurement antennas 101, and 60 patch antennas 103 are used as communication antennas 102. Each patch antenna 103 for the communication antenna 102 is called a communication element, and the patch antenna 103 for the angle measurement antenna 101 is called an angle measurement element.

*** Explanation of operation ***
The operation of the vehicle monitoring system 200 (particularly, the operation of the wireless communication device 100) corresponds to a vehicle monitoring method.

The vehicle monitoring method will be described based on FIG.
In step S110, the arrival direction measurement unit 121 measures the arrival direction of the radio wave transmitted from the vehicle-mounted device 211.
Specifically, the vehicle-mounted device 211 periodically transmits a radio wave. When the vehicle-mounted device 211 is in the communication area, the radio wave transmitted from the vehicle-mounted device 211 reaches the angle measuring antenna 101 and is received by the receiving unit 111. The direction-of-arrival measurement unit 121 measures a plurality of directions of arrival of radio waves from the same vehicle-mounted device 211 during the sampling time. The sampling time is a predetermined time.
The direction of arrival is detected by using a plurality of angle measuring antennas 101, that is, a plurality of patch antennas 103, and measuring a phase monopulse type difference signal.
The arrival direction is represented by, for example, an angle formed by the arrival direction with respect to the reference direction.

In step S120, the traveling state detection unit 122 detects the traveling state of the vehicle 210 on which the vehicle-mounted device 211 is mounted, based on the plurality of arrival directions measured during the sampling time.
For example, the traveling state detection unit 122 detects, as the traveling state of the vehicle 210, that the angle of the arrival direction changes from within a specific range to outside the range or from outside the specific range to within the range within a certain period of time. The lane change of the vehicle 210 is detected.
For example, the traveling situation detection unit 122 determines that the traveling direction of the vehicle 210 is such that the angle of arrival is greater than or equal to a reference angle (plus side (minus side)) from a reference angle within a certain period of time, and then the minus side (plus side) setting angle. The meandering operation of the vehicle 210 is detected by detecting the change to the above for a set number of times or more.
For example, the traveling state detection unit 122 detects a long-term stop by detecting that the arrival direction remains within a specific range or does not change within a predetermined time as the traveling state of the vehicle 210. A prolonged stop means a stop that continues beyond the specified time.

In step S130, the information providing unit 123 transmits to the management device 220 driving state information indicating the detected driving state.
The traveling state information is transmitted via the modem unit 115, the transmitting unit 113, the diplexer 112, and the communication antenna 102.

The management device 220 receives the traveling state information from the wireless communication device 100 and transmits the alert information to the wireless communication device 100.
The alert information is information according to the driving situation, and indicates a message for alert.

The alert information in the case where the traveling situation information indicates a lane change of the vehicle 210 indicates a message for preventing collision.
The alert information in the case where the traveling situation information indicates the meandering driving of the vehicle 210 indicates a message for preventing a drowsy driving or a dangerous driving.
The alert information in the case where the traveling status information indicates a long-time stop indicates a message for warning about parking violation.

For example, the management device 220 generates alert information as follows.
The management device 220 stores an information table in advance. The information table is a table that associates the traveling state information and the alert information with each other. Then, the management device 220 acquires, from the information table, the alert information associated with the same information as the received traveling state information.

In step S140, the information providing unit 123 receives the alert information from the management device 220.
The alert information is received via the communication antenna 102, the diplexer 112, the receiving unit 114, and the modem unit 115.

In step S150, the information providing unit 123 transmits the received alert information to the communication area.
The alert information is transmitted via the modulation / demodulation unit 115, the transmission unit 113, the diplexer 112, and the communication antenna 102.

The vehicle-mounted device 211 in the communication area receives the alert information transmitted to the communication area.
Then, the vehicle-mounted device 211 outputs the received alert information.
For example, the vehicle-mounted device 211 outputs alert information by voice. Alternatively, the vehicle-mounted device 211 displays the alert information on the display. Thereby, the alert information is provided to the driver. That is, the driver is alerted according to the driving situation.

*** Effect of Embodiment 1 ***
By introducing a wireless communication device capable of detecting the direction of arrival of a radio wave transmitted from the vehicle-mounted device, it is possible to obtain a traveling locus of a vehicle passing through a communication area of the wireless communication device. Then, it is possible to provide information according to the driving situation.

*** Other configuration ***
The traveling state of the vehicle 210 may be determined by the management device 220 or another device. A device that determines the traveling state of the vehicle 210 is referred to as a determination device.
In this case, the traveling situation detection unit 122 transmits arrival direction information indicating a plurality of arrival directions to the determination device. The determination device receives the arrival direction information, determines the traveling state of the vehicle 210 based on a plurality of arrival directions indicated by the arrival direction information, and transmits traveling state information indicating the traveling state of the vehicle 210 to the wireless communication device 100. . Then, the traveling state detection unit 122 receives the traveling state information.

The alert information may be generated by the wireless communication device 100.
In this case, the information providing unit 123 generates alert information like the management device 220 in step S130 of FIG.

*** Supplement to the embodiment ***
The embodiment is an exemplification of a preferred embodiment, and is not intended to limit the technical scope of the present invention. Embodiments may be implemented partially or in combination with other embodiments. The procedure described using the flowchart and the like may be appropriately changed.

  REFERENCE SIGNS LIST 100 wireless communication device, 101 angle measuring antenna, 102 communication antenna, 103 patch antenna, 110 wireless communication circuit, 111 receiver, 112 diplexer, 113 transmitter, 114 receiver, 115 modulator / demodulator, 120 processing circuit, 121 arrival direction measurement Unit, 122 running state detecting unit, 123 information providing unit, 200 vehicle monitoring system, 210 vehicle, 211 vehicle-mounted device, 220 management device.

Claims (8)

An arrival direction measurement unit that measures an arrival direction of a radio wave transmitted from the vehicle-mounted device,
A wireless communication device comprising: a traveling state detection unit that detects a traveling state of a vehicle equipped with the on-vehicle device based on a plurality of arrival directions measured during a sampling time. The wireless communication device according to claim 1, wherein the traveling state detection unit detects a lane change of the vehicle as the traveling state. The wireless communication device according to claim 1, wherein the traveling state detection unit detects the meandering operation of the vehicle as the traveling state. The wireless communication device according to claim 1, wherein the traveling state detection unit detects a stop that has been continued for more than a specified time as the traveling state. The wireless communication device according to any one of claims 1 to 4, further comprising an information providing unit configured to transmit alert information according to the driving situation to the vehicle-mounted device. The said information provision part transmits the driving | running state information which shows the said driving | running state to a management apparatus, receives the said alert information from the said management apparatus, and transmits the said alert information to the said onboard equipment. Wireless communication device. The wireless communication device includes a plurality of patch antennas for receiving radio waves from the vehicle-mounted device,
The wireless communication device according to claim 1, wherein the arrival direction measurement unit measures an arrival direction of a radio wave from the vehicle-mounted device using the plurality of patch antennas. An arrival direction measurement unit that measures an arrival direction of a radio wave transmitted from the vehicle-mounted device,
A vehicle monitoring program for causing a computer to function as a traveling state detection unit that detects a traveling state of a vehicle equipped with the on-vehicle device based on a plurality of directions of arrival measured during a sampling time.

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