JP6799984B2 - Road-to-vehicle information communication system - Google Patents

Description

The present invention relates to a road-to-vehicle information communication system that provides information on a road to a vehicle traveling on the road by wireless communication.

Conventionally, there has been known a road-to-vehicle information communication system that supports the driving of a vehicle traveling on the road by providing information on the road to a vehicle traveling on the road by wireless communication.

For example, Non-Patent Document 1 describes information by wireless communication between road-side infrastructure equipment (road-side equipment) such as sensors and traffic lights installed in advance on the road and in-vehicle equipment installed in a vehicle traveling on the road. It describes a technology related to a road-to-vehicle information communication system that enables driving support of the vehicle by exchanging the vehicle, thereby avoiding a traffic accident and alleviating a traffic jam.

Masaharu Hamaguchi, "Latest Trends in ITS Communications-Current Situation and Prospects of ITS Representing Vehicle-to-Vehicle Communications-", ITU Journal, December 2013, Vol. 43 No. 12, p.3-7

However, in road-to-vehicle communication, there are a wide variety of information provided to the vehicle from the infrastructure equipment on the road side for safe driving of the vehicle, and the road conditions change from moment to moment. It is difficult for the driver himself to instantly judge whether or not there is a place of caution on the road that may lead to an accident from various information.

For example, on a road having multiple lanes such as a road with two lanes on each side, if construction is being carried out in one of the lanes, there is a risk that a vehicle traveling in the construction lane may accidentally jump into the work area of the construction site. However, it is difficult for the driver himself to instantly predict or judge the risk of jumping into the work area only from the information on the presence or absence of the work area and the information such as the speed of the vehicle provided by the conventional road-to-vehicle communication. is there. As described above, in the conventional system, it is difficult to reliably inform the driver that there is a place of caution on the road where the vehicle needs to be careful when traveling.

On the other hand, it is conceivable to judge the presence or absence of an event that may lead to an accident from a wide variety of information provided from the road side by the driving support system mounted on the vehicle, but in this case, the driving support system is enormous. The problem arises that the ability to process the amount of information is required.

An object of the present invention is to solve such a point, and an object of the present invention is road-to-vehicle information capable of warning a driver of a place requiring attention on a road with high accuracy. The purpose is to provide a communication system.

The road-to-vehicle information communication system of the present invention includes a roadside unit arranged on the road on which the vehicle travels, and the roadside unit wirelessly performs information communication with an in-vehicle unit mounted on the vehicle. In a communication system, the roadside unit detects an arrangement that is arranged at the attention-requiring place within a period in which the attention-requiring place exists on the road, and an arrangement that is provided on the arrangement and the position of the arrangement is detected. Arrangement to wirelessly transmit the position information of the arrangement body provided on the arrangement body and the position information of the arrangement body and the caution information regarding the place requiring attention to the in-vehicle device. possess a side information communicating portion, and the vehicle device, the vehicle-side information communication unit which receives the warning information about the suspicious location and position information of the placement member, which is transmitted from the placement side information communication unit, The arrangement has a display unit for displaying the position information of the arrangement and the caution information regarding the place requiring attention received by the vehicle-side information communication unit, and the arrangement includes a plane array antenna and the plane array antenna. A pulse radar type Doppler radar capable of detecting the speed of the vehicle at a position separated by a preset distance from the antenna, and a speed of the vehicle detected by the Doppler radar at a position separated from the plane array antenna by a set distance. It is a vehicle approach warning device having a monitoring unit that outputs a warning signal when is equal to or higher than a preset speed, and a warning generation unit that issues a warning when a warning signal output from the monitoring unit is input. The set distance is set to the distance from an obstacle existing on the upstream side of the lane in which the vehicle travels to the planar array antenna, and in the planar array antenna, the antenna surface of the planar array antenna extends the lane. The width of the lane in which the planar array antenna is arranged at a position where the pulse wave emitted by the Doppler radar is oriented so as to be perpendicular to the current direction and is separated from the planar array antenna by the set distance. characterized in der Rukoto having a degree of directional falling within the scope of.

In the road-to-vehicle information communication system of the present invention, in the above configuration, the vehicle-mounted device has a vehicle-side warning generation unit that issues a warning when the warning signal is input, and the arrangement-side information communication unit issues the warning signal. The vehicle side warning generation unit issues a warning by transmitting wirelessly to the vehicle side information communication unit and inputting the warning signal received by the vehicle side information communication unit to the vehicle side warning generation unit. Is preferable.

In the road-to-vehicle information communication system of the present invention, in the above configuration, the vehicle-side warning generating unit is a portable terminal carried by the driver of the vehicle, and the warning signal received by the vehicle-side information and communication unit is transmitted. It is preferable that the signal is transmitted wirelessly to the vehicle-side warning generator by a wireless transmitter.

In the road-to-vehicle information communication system of the present invention, in the above configuration, it is preferable that the place requiring attention is a work area of a construction site installed on the road.

According to the present invention, it is possible to provide an inter-vehicle information communication system capable of warning a driver of a place requiring attention on a road with high accuracy.

It is explanatory drawing which shows the example of the road-to-vehicle information communication system which is one Embodiment of this invention schematic. It is a block diagram of the road-to-vehicle information communication system shown in FIG. It is a front view of the Doppler radar main body shown in FIG. It is explanatory drawing which shows the setting board of the Doppler radar main body. It is explanatory drawing which shows the case where the vehicle approach warning device shown in FIG. 1 is installed in the work area provided immediately after the curved portion of the road. It is a block diagram which shows the internal structure of the information processing part of the ITS fixed machine shown in FIG. It is a flowchart which shows the processing procedure of the information between a vehicle approach warning device and a vehicle. It is a block diagram of the modification of the road-to-vehicle information communication system shown in FIG. It is explanatory drawing which shows the example of installation on the road of the road information presenting apparatus shown in FIG. It is explanatory drawing which shows the modification of the road information presenting apparatus shown in FIG.

Hereinafter, embodiments of the present invention will be illustrated in detail with reference to the drawings.

The road-to-vehicle information communication system of the present invention includes a roadside unit arranged on a road (roadway) on which a vehicle travels, and the roadside unit performs wireless information communication with an in-vehicle unit mounted on the vehicle. Then, the location information of the places requiring attention on the road and the caution information regarding the places requiring attention are transmitted to the vehicle to warn the driver of the vehicle that there is a place requiring attention on the road, and support the driver. It is something to do.

The places to watch on the road are, for example, the work area of the construction site on the road, the place where the broken vehicle or the accident vehicle is stopped on the road, and the foreign matter such as cargo falling on the road. It is a place that exists only for a certain period of time on the road, such as a place where the road is located or a place where the road is damaged such as a depression, and a vehicle traveling on the road needs to be careful when traveling.

In the road-to-vehicle information communication system of the present invention, the roadside unit does not necessarily have to be installed in a fixed state on the road, and may be portable or mobile, and is arranged at an arbitrary place of caution on the road. can do. As a result, even when a place requiring attention is set up in a certain place on the road for a predetermined period of time, such as a work area at a construction site, by arranging the roadside machine in the place requiring attention, the place requiring attention is placed. It is possible to easily configure a road-to-vehicle information communication system that transmits the position information and caution information of the vehicle to the vehicle.

FIG. 1 shows the road-to-vehicle information communication system 1 according to the embodiment of the present invention on one side of a two-lane road 2 (general road) in which a plurality of lanes 2a and 2b are provided on one side of the central line 7. The work area 3 of the construction site installed on the lane 2a of the above is set as a place to be watched, and the position information of the work area 3 and the caution information about the work area 3 are transmitted to the vehicles 4 and 119 traveling on the road 2. , The case where the warning information regarding the dive into the work area 3 is transmitted to the vehicle 4 traveling on the lane 2a is shown.

The road-to-vehicle information communication system 1 includes a roadside machine 100 arranged on a road 2 on which vehicles 4 and 119 travel. In the present embodiment, the roadside machine 100 includes a vehicle approach warning device 101 and an ITS fixing machine 102 as an arrangement body, and the ITS fixing machine 102 is mounted on vehicles 4 and 119 traveling on the road 2. By wirelessly communicating information with the in-vehicle device 200, the position information of the work area 3 on the road 2 and the caution information about the work area 3 (information that the work area 3 is on the road 2 and the work area). Information that lane restrictions are imposed due to the presence of 3) can be transmitted wirelessly to vehicles 4 and 119. Further, in the present embodiment, the roadside machine 100 encrypts the warning signal issued by the vehicle approach warning device 101 with the on-board unit 200 mounted on the vehicle 4 in which the ITS fixing machine 102 travels on the lane 2a. By communicating with the vehicle, it is possible to transmit the warning information regarding the dive into the work area 3 to the vehicle 4.

Hereinafter, the details of the vehicle approach warning device 101 will be described first.

The vehicle approach warning device 101 is for protecting the worker 5 from diving into the work area 3 of the vehicle 4 arranged in the work area 3 on the road 2 and traveling on the lane 2a. That is, the vehicle approach warning device 101 monitors the speed of the vehicle 4 traveling toward the work area 3 on the lane 2a at a position separated from the work area 3 by a predetermined distance, and works at a speed equal to or higher than the set speed at the position. When the vehicle 4 approaching the area 3 is detected, a warning is issued to the worker 5 working in the work area 3 and the worker 5 is urged to evacuate to the outside of the work area 3. As a result, even if the vehicle 4 jumps into the work area 3, the worker 5 can be protected from the jump of the vehicle 4.

In FIG. 1, the lane 2a is the lane on the side of the roadside zone 6 of the road 2, and the lane 2b is the lane on the side of the center line 7 of the road 2. Further, the work area 3 is partitioned by a plurality of pylon 8 arranged on the lane 2a of the road 2 so as to surround the construction site. Instead of the pylon 8, the work area 3 can be partitioned by other members such as a fence.

As shown in FIGS. 1 and 2, the vehicle approach warning device 101 includes a Doppler radar 110 and a warning generating unit 120.

The Doppler radar 110 includes a radar control unit 112, a wireless transmitter 113, a radar operation board 114, a switching power supply 115, and a USB converter 117 for communication with an external device 116 inside the square case 111, and the case 111. A plane array antenna 118 is attached to the outside of the unit to form a single unit.

As shown in FIG. 3, the planar array antenna 118 has a flat antenna surface 118a, and has a configuration in which a large number of antenna elements (radiating elements) arranged in a grid pattern are provided therein.

The Doppler radar 110 is of a pulse radar system, and by feeding power from the radar control unit 112 to each antenna element of the planar array antenna 118 under constant excitation conditions, the direction is perpendicular to the antenna surface 118a from the planar array antenna 118. It is possible to transmit a pulse wave with high directivity toward the antenna. Further, the Doppler radar 110 can receive the reflected wave of the transmitted pulse wave by the planar array antenna 118.

The Doppler radar 110 may emit a pulse wave of 24 GHz, but its frequency is not particularly limited, for example, it may emit a pulse wave of 19 GHz.

An AC100V power connector 115a is connected to the switching power supply 115, and by connecting the power supply connector 115a to a commercial power supply, the radar control unit 112, the wireless transmitter 113, and the radar operation board 114 are connected via the switching power supply 115. Power is being supplied.

When the Doppler radar 110 is shipped from the factory, for example, an external device 116 such as a personal computer is connected to the USB converter 117, and various functions of the Doppler radar 110 are initially set.

The Doppler radar 110 is attached to a support means such as a tripod 130, and is arranged substantially in the center of the work area 3 in the width direction of the lane 2a as shown in FIG. At this time, the Doppler radar 110 is directed to the upstream side (right side in FIG. 1) of the plane array antenna 118 so that the antenna surface 118a of the plane array antenna 118 is perpendicular to the extending direction of the lane 2a, and the plane array. The antenna 118 is arranged at a height of about 1 m from the road surface.

In this way, the vehicle approach warning device 101 (Doppler radar 110) as an arrangement body is portable (mobile), and is arranged at various places on the road 2 by using a support means such as a tripod 130. be able to.

The Doppler radar 110 arranged on the lane 2a as described above can detect the speed of the vehicle 4 at a position separated from the planar array antenna 118 by a preset set distance L by the masking of the pulse radar method. .. At this time, since the planar array antenna 118 transmits a pulse wave having high directivity toward the direction along the extending direction of the lane 2a, the Doppler radar 110 travels in another lane 2b in which the work area 3 is not provided. It is possible to detect only the speed of the vehicle 4 traveling on the lane 2a in which the work area 3 is installed without erroneously detecting the speed of the vehicle 119. That is, the pulse wave transmitted by the Doppler radar 110 has a directivity that is within the width of the lane 2a at the set distance L. In this way, the Doppler radar 110 arranged in the work area 3 detects the speed of only the vehicle 4 at a position on the lane 2a in which the Doppler radar 110 is arranged and at a position separated by a set distance L from the planar array antenna 118. Can be done.

Since the Doppler radar 110 detects the speed of the vehicle 4 using pulse waves (radio waves), it accurately detects the speed of the vehicle 4 even in bad weather conditions such as when it rains or snows. be able to.

As shown in FIG. 1, the Doppler radar 110 preferably arranges the planar array antenna 118 in a posture perpendicular to the extending direction of the lane 2a in the substantially center of the width direction of the lane 2a in the work area 3, but the lane 2a If it is a place where the speed of only the vehicle 4 traveling in the lane 2a can be detected at a position separated by the set distance L from the above plane array antenna 118, it should be placed in another place in the work area 3. You may.

The radar control unit 112 of the Doppler radar 110 has the function of the monitoring unit 112a, and the speed of the vehicle 4 detected by the Doppler radar 110 at a position separated by a set distance L from the plane array antenna 118 is preset. When the speed is equal to or higher than the set speed, a warning signal is output to the wireless transmitter 113.

When the warning signal output from the radar control unit 112 (monitoring unit 112a) is input, the wireless transmitter 113 wirelessly transmits the warning signal to the warning generation unit 120.

The warning generator 120 has a receiving function of receiving a warning signal wirelessly transmitted from the wireless transmitter 113, and issues a warning to the worker 5 when the warning signal is received. There is. That is, the warning generation unit 120 issues a warning to the operator 5 when the warning signal output from the radar control unit 112 (monitoring unit 112a) is input.

The wireless communication of the warning signal between the wireless transmitter 113 and the warning generating unit 120 can be configured by using, for example, a specific low power radio station.

In the present embodiment, the warning generation unit 120 is configured as a wristwatch-type terminal worn on the arm (wrist) of the worker 5. In this case, the warning generation unit 120 includes a vibration generation unit (not shown) such as a vibration motor, and when a warning signal is input, the vibration generation unit operates to generate vibration. That is, the warning generation unit 120 is configured to cause the operator 5 to recognize the warning by vibration.

The warning generation unit 120 is not limited to a wristwatch-type terminal worn on the arm of the worker 5, but is also a mobile terminal of another shape that the worker 5 can carry or a stationary device arranged on the road 2. You can also do it. Further, the warning generating unit 120 is not limited to one that generates vibration as a warning, and may be, for example, a siren, a rotating light, a flashlight, or the like, or a combination of a plurality of these.

Further, the configuration is not limited to the configuration in which the radar control unit 112 (monitoring unit 112a) wirelessly transmits a warning signal to the warning generation unit 120, but the radar control unit 112 (monitoring unit 112a) and the warning generation unit 120 are connected by wire. It can also be. In this case, the warning generating unit 120 may be incorporated in the Doppler radar 110.

In such a vehicle approach warning device 101, the Doppler radar 110 is installed in the work area 3 as described above, and the warning generation unit 120 is attached to the arm of the worker 5 working in the work area 3. When the vehicle 4 jumps into the work area 3, warning information can be transmitted to the worker 5 to protect the worker 5.

That is, when the vehicle 4 traveling in the lane 2a in which the work area 3 is installed reaches a position separated from the work area 3, that is, the plane array antenna 118 by a set distance L, the Doppler radar 110 detects the speed of the vehicle 4 at that position. Will be done. If the detected speed of the vehicle 4 is equal to or higher than the preset speed, a warning signal is output from the monitoring unit 112a of the radar control unit 112, and the warning generation unit 120 vibrates to issue a warning to the operator 5. Be done.

Here, the position where the Doppler radar 110 detects the speed of the vehicle 4, that is, the set distance L, and the speed, that is, the set speed of the vehicle 4, which is the threshold value at which the monitoring unit 112a issues a warning signal, are the positions where the vehicle 4 has the set distance L. The value is set so that the worker 5 who has received the warning issued by the warning generation unit 120 can evacuate to a safe place outside the work area 3 before reaching the work area 3 and jumping into the work area 3. To. Therefore, the Doppler radar 110 detects the vehicle 4 traveling at a speed that may jump into the work area 3, and the warning generation unit 120 issues a warning to the worker 5 based on the detection result, thereby causing the worker 5 to know. It is possible to urge the worker to evacuate to the outside of the work area 3 and reliably protect the worker 5 against diving into the work area 3 of the vehicle 4.

In this way, in the vehicle approach warning device 101, the Doppler radar 110 detects the vehicle 4 that may jump into the work area 3, and the warning generation unit 120 warns the worker 5 of the diving. The worker 5 can be protected against diving into the work area 3 of 4.

Further, in the vehicle approach warning device 101, the Doppler radar 110 is provided with a plane array antenna 118 and can detect the speed of the vehicle 4 at a position separated from the plane array antenna 118 by a set distance L by masking by a pulse radar method. Therefore, even when the work area 3 is installed on one lane 2a of the road 2 provided with a plurality of lanes 2a and 2b, the Doppler radar 110 causes the vehicle 119 on the other lane 2b. Accurately detects the speed of only the vehicle 4 traveling on the lane 2a provided with the work area 3 without detecting the speed of the vehicle 4, and when the detected speed of the vehicle 4 is equal to or higher than the set speed, the warning generator A warning can be generated for 120. Therefore, it is possible to accurately detect the diving of the vehicle 4 traveling in the lane 2a provided with the work area 3 into the work area 3.

Further, in the vehicle approach warning device 101, the Doppler radar 110 may be installed inside the work area 3, and it is not necessary to install the Doppler radar 110 at a remote position on the upstream side of the work area 3, and the work Since it is not necessary to obtain a road occupancy permit for installing the Doppler radar 110 outside the area 3, the installation work is easy.

By operating the radar operation board 114, the vehicle approach warning device 101 sets a set distance L at which the Doppler radar 110 detects the speed of the vehicle 4 and a threshold value at which the monitoring unit 112a of the radar control unit 112 issues a warning. You can change the speed, that is, the set speed.

As shown in FIG. 4, the radar operation board 114 includes a distance setting switch 140 as a set distance changing unit, and the position where the Doppler radar 110 detects the speed of the vehicle 4 by operating the distance setting switch 140. That is, the set distance L can be changed. In the present embodiment, the set distance L can be selectively changed to one of the four distances of 7 m, 30 m, 40 m, and 50 m by operating the distance setting switch 140. More specifically, the set distance L selected each time the distance setting switch 140 is pressed can be sequentially changed in the order of 7 m, 30 m, 40 m, and 50 m. The radar operation board 114 is provided with four LED lamps corresponding to each set distance L arranged side by side on the left side of the distance setting switch 140, and the operator operates by lighting the LED lamps corresponding to the selected set distance L. Can recognize the selected set distance L. In the case shown in FIG. 4, the LED lamp corresponding to 50 m is lit.

Further, as shown in FIG. 4, the radar operation board 114 includes a speed setting switch 141 as a set speed changing unit, and by operating the speed setting switch 141, the monitoring unit 112a of the radar control unit 112 warns. It is possible to change the speed of the vehicle 4, that is, the set speed, which is the threshold value for emitting. In the present embodiment, the set speed is selectively changed to one of four speeds of 10 km / h, 50 km / h, 60 km / h and 70 km / h by operating the speed setting switch 141. Can be done. More specifically, the set speed selected each time the speed setting switch 141 is pressed can be sequentially changed in the order of 10 km / h, 50 km / h, 60 km / h, and 70 km / h. The radar operation board 114 is provided with four LED lamps corresponding to each set speed side by side on the left side of the speed setting switch 141, and the operator selects by lighting the LED lamps corresponding to the selected set speed. It is possible to recognize the set speed. In the case shown in FIG. 4, the LED lamp corresponding to 70 km / h is lit.

The radar operation board 114 can be operated by opening the back cover provided on the side opposite to the plane array antenna 118 of the case 111, but the distance setting switch 140 and the speed setting of the radar operation board 114 can be performed. The switch 141 and each LED lamp may be arranged on the surface of the case 111. Further, when the Doppler radar 110 is abnormal, all four LED lamps corresponding to the distance setting switch 140 and all four LED lamps corresponding to the speed setting switch 141 may blink.

As described above, the set distance L for detecting the speed of the vehicle 4 by the Doppler radar 110 and the set speed of the vehicle 4 which is the threshold value at which the monitoring unit 112a of the radar control unit 112 issues a warning can be changed. The vehicle approach warning device 101 can be applied to work areas (needs attention) 3 provided on various roads 2.

For example, as shown in FIG. 5, when the road 2 having two lanes on each side has a curve and the work area 3 is installed on the lane 2a immediately after the curve, the set distance L is set to the work area 3 and the curve. By setting the vehicle to a shorter distance corresponding to the short distance between the vehicle and the vehicle 4 and setting the speed of the vehicle 4 which is the threshold value at which the monitoring unit 112a issues a warning to a slower speed, the vehicle approach warning device 101 is subjected to the work. By adapting to the area 3, it is possible to accurately detect the jump of the vehicle 4 traveling in the lane 2a provided with the work area 3 into the work area 3.

Here, in FIG. 5, the plane array antenna 118 of the Doppler radar 110 arranged in the work area 3 is installed so as to be oriented so that the antenna surface 118a is perpendicular to the extending direction of the lane 2a. Further, the normal direction of the antenna surface 118a of the planar array antenna 118 is the s direction, and the speed vector of the vehicle 4 when the vehicle 4 at the position A ₄ travels to the position B ₄ is V ₄ , and the speed vector V ₄ s. the direction of the component _{V p4,} speed and _{V p4} vector _{V 4} perpendicular component with indicated as _{V t4,} the position _{a 119 V 119} the velocity vector of the vehicle 119 when the vehicle 119 has traveled to a position _{B 119} in, the s-direction component of the velocity vector _{V 119 V p119,} indicates the vertical component and _{V p119} velocity vector _{V 119} as _{V T119.} Here, _{L 1} is the distance from the planar array antenna 118 of the Doppler radar 110 of a vehicle 119, a distance L from the planar array antenna 118 of the Doppler radar 110 position _{B 4} are curves of the lane 2a of the vehicle 4 is traveling Is the distance from the end of the plane array antenna 118.

Vehicle 4 traveling on the lane 2a having a curve, decelerates immediately before going into the curve, acceleration starts immediately before the position B ₄ near, so to continue the accelerated to reach the speed limit beyond the position B _4, During this time, the magnitude of the speed vector of the vehicle 4 changes from moment to moment.

Here, the planar array antenna 118 is installed so that the antenna surface 118a of the planar array antenna 118 is oriented so as to be perpendicular to the extending direction of the lane 2a, and the pulse wave emitted by the Doppler radar 110 is a planar array. Since the Doppler radar 110 has a directional property that is within the width of the lane 2a in which the planar array antenna 118 is arranged at a position separated from the antenna 118 by a set distance L, the Doppler radar 110 makes a curve in the lane 2a. When the traveling vehicle 4 reaches the vicinity of the position B ₄ , the speed vector of the vehicle 4 has a speed component V _p4 in the s direction even if the speed vector of the vehicle 4 changes from moment to moment. Based on the fact that the vehicle 4 is present, it can be detected that the vehicle 4 is present in a direction substantially in the s direction. Further, since the set distance L is set to the distance from the end of the curve of the lane 2a in which the vehicle 4 travels to the planar array antenna 118, the Doppler radar 110 is located at a position separated by the set distance L from the planar array antenna 118. The vehicle 4 in the above can be detected as a detection target.

Thus, that the vehicle 4 is in position B ₄ near detects with high accuracy, when the vehicle 4 is set speed or more at the end position B ₄ near clogging curve, warning generating unit provided in the work area 3 120 A warning signal can be surely issued toward.

On the other hand, when the vehicle 119 traveling in the adjacent lane 2b is in the vicinity of the position A ₁₁₉ , the speed vector V ₁₁₉ of the vehicle 119 has a speed component in the s direction, so that the vehicle 119 is substantially in the Doppler radar 110. Detects that it exists in the s direction. However, at this time, since the distance L ₁ from the Doppler radar 110 to the vehicle 119 is larger than the set distance L, the vehicle 119 in the vicinity of the position A ₁₁₉ is not detected as a detection target. Further, when the vehicle 119 reaches the vicinity of the position B ₁₁₉ , the distance from the Doppler radar 110 to the vehicle 119 becomes the set distance L, but the vehicle 119 traveling in the lane 2b is in the lane 2a in which the plane array antenna 118 is arranged. Since it is outside the range of the width of the vehicle 119, the velocity component V _{p119 in} the s direction of the vehicle 119 does not exist in the detection region of the Doppler radar 110, and therefore the vehicle 119 in the vicinity of the position B ₁₁₉ is not detected as a detection target.

That is, only the vehicle 4 which is in the s direction with respect to the plane array antenna 118 of the Doppler radar 110 and is near the position of the distance L from the plane array antenna 118 is accurately detected as the detection target by the instantaneous value of the vehicle speed. While being detected (captured), the vehicle 119 traveling in the adjacent lane 2b is not detected as a detection target.

From the above, the following effects can be obtained. That is, there are many curves on general roads, and work such as construction is often performed in an area close to the curve downstream of the curve. As described above, vehicles traveling in front of and behind the curve decelerate immediately before entering the curve, start accelerating just before reaching the end of the curve, and continue accelerating until the speed limit is reached after passing the curve. During that time, the speed of the vehicle will change from moment to moment. Therefore, even if this changing vehicle speed is accurately detected by the Doppler radar, not only the speed change cannot be detected unless the vehicle speed after detection is repeatedly measured, but also the vehicle continues to run during that time, so that it is detected. It is necessary to secure a sufficient time and a detectable area in advance.

On the other hand, in the vehicle approach warning device 101, the Doppler radar 110 detects the orientation of the vehicle based on the presence or absence of the speed component (instantaneous value) in the s direction of the traveling vehicle, and from the plane array antenna 118 to the vehicle. Since the existing position of the vehicle can be accurately detected depending on whether or not the distance is the set distance L, the position of the vehicle can be accurately detected or captured by one measurement even in a narrow downstream area immediately after the curve. Can be done. Therefore, even when the work area 3 is set in the narrow downstream area immediately after the curve, the worker in the work area 3 can be warned with high accuracy.

The vehicle approach warning device 101 outputs a warning signal when the speed of the vehicle detected by the Doppler radar 110 at a position separated from the plane array antenna 118 by a set distance L is equal to or higher than a preset set speed. The speed is used as a trigger when outputting a warning signal, and it is sufficient for the vehicle to have a speed component in the s direction at an arbitrary set distance L in order to accurately detect the presence position of the vehicle. Is. That is, in a road condition where the vehicle speed changes significantly downstream of a curve, the set speed that triggers the output of a warning signal is set to the traffic condition (vehicle) at that time after giving priority to accurate detection of the vehicle position. It may be set appropriately in consideration of the degree of congestion, good visibility upstream of the curve, etc.) and the work environment (road occupying area of the work area, standing position of the worker, etc.). On the other hand, the set distance L may also be set as the distance from the vehicle approach warning device 101 to a specific traffic obstacle, line-of-sight obstacle, or the like existing on the upstream side thereof. As a result, it is possible to detect the vehicle immediately after coming out of the obstacle. With such a configuration, even if the work area 3 is provided on a road in a complicated environment (a residential area with poor visibility, near an intersection, the presence of parked vehicles, etc.), the safety of the worker in the work area 3 Can be enhanced.

On the other hand, on a highway or the like, the work area 3 is provided by setting the set distance L to a longer distance and setting the set speed of the vehicle, which is the threshold value at which the monitoring unit 112a issues a warning, to a higher speed. It is possible to accurately detect the jump of the vehicle 4 traveling in the lane 2a into the work area 3.

Next, the ITS fixing machine 102 will be described.

As shown in FIG. 1, the ITS fixing machine 102 is provided in the vehicle approach warning device 101, which is an arrangement body, and is arranged in the work area 3 on the road 2 together with the vehicle approach warning device 101.

As shown in FIG. 2, the ITS fixing machine 102 has a GPS receiving unit 150 as an arrangement position detection unit, an ITS wireless communication unit 160 as an arrangement side information communication unit, and an information processing unit 170.

The GPS receiver 150 is a receiver of a GPS system (Global Positioning System), and by receiving a signal from a satellite constituting the GPS system, the position of the ITS fixed device 102, that is, the ITS fixed device 102 is moved. The position of the fixed vehicle approach warning device 101 can be detected.

The ITS wireless communication unit 160 can perform communication based on a standard communication standard for ITS (Intelligent Transport Systems) such as "ARIB STD T-109 (700 MHz band)" and "IEEE802.11p". It consists of a wireless communication device. In the present embodiment, the ITS wireless communication unit 160 is composed of a wireless communication device capable of communicating information conforming to the standard of "ARIB STD T-109 (700 MHz band)".

As shown in FIG. 6, the information processing unit 170 includes a processor (arithmetic processing unit) 171 and a storage unit 172 such as a memory connected to the processor 171.

The processor 171 has a GPS receiving unit interface 173 for the GPS receiving unit 150, and is connected to the GPS receiving unit 150 at the GPS receiving unit inter-interface 173. As a result, the processor 171 can obtain the position of the vehicle approach warning device 101 on the road 2 to which the ITS fixing device 102 is fixed, that is, the position information of the vehicle approach warning device 101, based on the input from the GPS receiving unit 150. it can.

The processor 171 has a vehicle approach warning device-to-vehicle interface 174 for the vehicle approach warning device 101, and is connected to the vehicle approach warning device 101 at the vehicle approach warning device-to-vehicle interface 174. When the monitoring unit 112a of the vehicle approach warning device 101 detects the possibility of the vehicle 4 jumping into the work area 3, a warning signal is input from the vehicle approach warning device 101 to the processor 171 via the vehicle approach warning device inter-interface 174. ..

Further, the processor 171 can obtain caution information regarding the work area 3 based on the information input from the vehicle approach warning device 101 via the vehicle approach warning device interface 174, for example.

Note that the caution information regarding the work area 3 is not limited to the information based on the input information from the vehicle approach warning device 101, and is configured to be input to the processor 171 from an input means (not shown) or stored in the storage unit 172 in advance. It can also be configured to be stored. Further, when a road information presenting device 300 such as a construction sign or a construction vehicle is arranged in the work area 3 in addition to the vehicle approach warning device 101, the road information is provided by the road information presenting device-to-road interface 176 provided in the processor 171. The presenting device 300 may be connected to the processor 171 so that the road information presenting device 300 may input the caution information regarding the work area 3 to the processor 171.

The processor 171 has an ITS wireless communication unit interface 175 for the ITS wireless communication unit 160, and is connected to the ITS wireless communication unit 160 at the ITS wireless communication unit interface 175.

Caution information about the work area 3 input to the processor 171 and processed by the processor 171, position information of the vehicle approach warning device 101 input to the processor 171 from the GPS receiver 150, and input from the vehicle approach warning device 101 to the processor 171. The warning signal is sent to the ITS wireless communication unit 160 via the ITS wireless communication unit interface 175, and is wirelessly transmitted from the ITS wireless communication unit 160 to the in-vehicle device 200. The on-board unit 200 to be communicated by the ITS wireless communication unit 160 is an on-board unit 200 of all vehicles within the communication range of the ITS wireless communication unit 160.

In the present embodiment, the ITS fixing machine 102 is configured separately from the vehicle approach warning device 101, which is an arrangement body, and is fixed to the vehicle approach warning device 101. By configuring the ITS fixing machine 102 separately from the vehicle approach warning device 101 in this way, it is possible to fix the ITS fixing machine 102 to another arrangement different from the vehicle approach warning device 101. The versatility of the fixed machine 102 can be increased.

When the ITS fixing machine 102 is configured separately from the vehicle approach warning device 101, the power connector of the ITS fixing machine 102 can be connected to the power supply terminal of the vehicle approach warning device 101. The power connector may be separately connected to a commercial power source.

On the other hand, the ITS fixing machine 102 may be integrally provided with the vehicle approach warning device 101. In this case, the radar control unit 112 of the vehicle approach warning device 101 and the information processing unit 170 of the ITS fixing machine 102 can be configured by one control unit having both of these functions.

Next, the vehicle-mounted device 200 will be described.

As shown in FIG. 2, the on-board unit 200 includes an ITS wireless communication unit 210 as a vehicle-side information communication unit, a display unit 220, a GPS reception unit 230 as a vehicle position detection unit, a vehicle-side warning generation unit 240, and an information processing unit. Has 250.

The ITS wireless communication unit 210 is composed of a wireless communication device capable of communicating information conforming to the standard of "ARIB STD T-109 (700 MHz band)" like the ITS wireless communication unit 160 of the ITS fixed machine 102. Therefore, information communication can be performed wirelessly with the ITS wireless communication unit 160 of the ITS fixed machine 102. That is, the ITS wireless communication unit 210 receives the caution information regarding the work area 3, the position information of the vehicle approach warning device 101, and the warning signal of the vehicle approach warning device 101 transmitted from the ITS wireless communication unit 160 of the ITS fixed device 102. can do.

The display unit 220 is, for example, a monitor for a navigation system mounted on a vehicle. The caution information regarding the work area 3 received by the ITS wireless communication unit 210 and the position information of the vehicle approach warning device 101 are input to the information processing unit 250, processed into image information, and sent to the display unit 220. As a result, cautionary information regarding the work area 3 and position information of the vehicle approach warning device 101 are displayed on the display unit 220. At this time, the caution information regarding the work area 3 and the position information of the vehicle approach warning device 101 can be displayed on a map or the like displayed on the display unit 220 by the navigation system. As a result, the driver of the vehicles 4 and 119 can recognize that the work area 3 is on the road 2 and its position by visually recognizing the display unit 220.

The display unit 220 is not limited to the monitor for the navigation system, as long as it can display the caution information regarding the work area 3 and the position information of the vehicle approach warning device 101 to the driver. It can also be configured with another monitor other than the monitor for.

The GPS receiving unit 230 is a receiver of the GPS system, and detects the positions of the vehicles 4 and 119 on which the in-vehicle device 200 is mounted by receiving signals from satellites constituting the GPS system. The position information of the vehicles 4 and 119 detected by the GPS receiving unit 230 is input to the information processing unit 250.

Here, in the communication standard of "ARIB STD T-109 (700 MHz band)", a method is adopted in which the bandwidth of 1 MHz is set as one channel and the communication period of road-to-vehicle communication and the communication period of vehicle-to-vehicle communication are separated in time. During the communication period of road-to-vehicle communication, only one-way transmission is possible from the roadside unit to the on-board unit by the TDMA method, and during the communication period of vehicle-to-vehicle communication, the CSMA / CA method is used between multiple on-board units. Allows two-way communication.

In the present embodiment, the ITS wireless communication unit 160 of the ITS fixed device 102 uses the road-to-vehicle communication frame during the above-mentioned communication period of the road-to-vehicle communication for the caution information regarding the work area 3 and the position information of the vehicle approach warning device 101. By using the TDMA method, the caution information and the position information are transmitted to the ITS wireless communication unit 210 of the vehicle-mounted device 200.

On the other hand, the warning signal of the vehicle approach warning device 101 is transmitted only to the vehicle 4 traveling on the lane 2a detected by the vehicle approach warning device 101, and is not transmitted to other vehicles (for example, vehicle 119). Need to be. Therefore, when transmitting (transferring) a warning signal from the ITS wireless communication unit 160 of the ITS fixed device 102 to the ITS wireless communication unit 210 of the in-vehicle device 200, the ITS fixed device is used to transmit and receive the encrypted information of the warning signal. It is necessary to perform two-way communication between the ITS wireless communication unit 160 of 102 and the ITS wireless communication unit 210 of the vehicle-mounted device 200. Therefore, in the present embodiment, regarding the warning signal of the vehicle approach warning device 101, the roadside unit 100 is regarded as a pseudo-stopped vehicle, and the ITS wireless communication unit 160 of the ITS fixed device 102 and the ITS wireless communication unit 210 of the vehicle-mounted device 200 are regarded. During the communication period of vehicle-to-vehicle communication, bidirectional communication is performed by the CSMA / CA method using the vehicle-to-vehicle communication frame. The procedure for processing information between the vehicle approach warning device 101 and the vehicle 4 will be described below with reference to FIG. 7.

Assuming that encrypted information is transmitted and received by bidirectional communication between the ITS wireless communication unit 160 of the ITS fixed device 102 and the ITS wireless communication unit 210 of the in-vehicle device 200, the information processing unit 250 of the in-vehicle device 200 of the vehicles 4 and 119 The data of the public key A and the private key a are stored, and the private key B is stored in the information processing unit 170 (storage unit 172) of the ITS fixing machine 102 on the side of the vehicle approach warning device 101. Further, among all the vehicles within the communication range of the ITS fixed machine 102 (ITS wireless communication unit 160), the vehicle 4 to be warned detected by the vehicle approach warning device 101 is set as the vehicle n, and the public key held by the vehicle n is An. , The private key is an. Further, information that the vehicle approach warning device 101 is a regular vehicle approach warning device is registered in advance in the information processing unit 250 on the vehicle side.

First, in step S1, the information processing unit 170 of the roadside machine 100 (ITS fixed machine 102) provided with the vehicle approach warning device 101 performs the public key A for all vehicles within the communication range of the ITS wireless communication unit 160. And requests the transmission of GPS information (position information) of the vehicle.

On the other hand, in step S2, the vehicle in the entire communication range including the vehicle n transmits the public key A and the GPS information to the roadside machine 100. At this time, the public key transmitted by the vehicle n is the public key An.

Next, the information processing unit 170 on the vehicle approach warning device 101 side, which has received the public key and GPS information from the vehicle in the entire communication range including the vehicle n, detects the vehicle input from the vehicle approach warning device 101 in step S3. Based on the information (position information of the vehicle 4 at the time of detection) and the GPS information input from the vehicle, the vehicle n to be detected by the vehicle approach warning device 101 is specified from all the vehicles within the communication range. Here, the vehicle approach warning device 101 determines the position of the vehicle (detected vehicle) 4 determined by the normal direction (s direction in FIG. 5) of the antenna surface 118a of the planar array antenna 118 and the set distance L. It is converted into the GPS information of the vehicle 4 by comparing with the GPS information of the approach warning device 101 itself. Further, at this time, considering that the position (GPS information) of the vehicle 4 changes within the propagation time of wireless communication and the processing time of GPS information, the vehicle approach warning is on the s direction and is greater than the set distance L. All the points existing on the straight line on the device 101 side can be treated as GPS information of the vehicle 4. In this way, the GPS information of the vehicle 4 detected by the vehicle approach warning device 101 is collated with the GPS information transferred from the vehicle n, and when these GPS information are the same, the vehicle 4 is the same vehicle as the vehicle n. Identify as being.

Next, in step S4, the information processing unit 170 encrypts the secret key B on the vehicle approach warning device 101 side and the transferred information, that is, the warning signal input from the vehicle approach warning device 101, with the public key An of the vehicle n. Then, in step S5, the encrypted information is transmitted.

The encrypted information transmitted from the vehicle approach warning device 101 side can be received by all vehicles within the communication range, but since the vehicle other than the vehicle n does not have a private key an capable of decrypting the public key An. , Only the vehicle n that is the detection target of the vehicle approach warning device 101 can decrypt the encrypted information.

In step S6, the vehicle n that has received the encrypted information takes out the private key B from the transferred encrypted information using the private key an, and the source of the transferred encrypted information based on the private key B. Authenticates whether the registered vehicle approach warning device 101 is used.

Then, when it is authenticated that the source of the transferred encrypted information is the registered vehicle approach warning device 101, the encrypted information is decrypted with the private key an, and the warning signal is sent to the information processing unit 250. Entered.

By transmitting and receiving encrypted information between the vehicle approach warning device 101 and the vehicle 4 as described above, among all the vehicles within the communication range of the ITS wireless communication unit 160, the detection target of the vehicle approach warning device 101 can be obtained. The warning signal can be transmitted only to the vehicle n (vehicle 4 in the case shown in FIG. 1).

When the warning signal is transmitted to the information processing unit 250 of the vehicle n, that is, the vehicle 4, the warning signal is input to the vehicle side warning generation unit 240, and the vehicle side warning generation unit 240 issues a warning to the driver. As a result, not only the information about the work area 3 displayed on the display unit 220 and the position information of the work area 3 are transmitted to the driver of the vehicle 4, but also the vehicle 4 may jump into the work area 3. Warning information can be transmitted to the driver of the vehicle 4. That is, the warning by the vehicle approach warning device 101 can be transmitted not only to the worker 5 in the work area 3 but also to the driver of the vehicle 4.

The vehicle-side warning generation unit 240 can be configured as a portable terminal carried by the driver of the vehicle. In this case, the vehicle-side warning generation unit 240 can be configured as a wristwatch-type terminal worn on the driver's arm (wrist) like the warning generation unit 120, but the vehicle-side warning generation unit 240 is attached to the mobile phone terminal. It can also be configured to have the function of. In any case, the vehicle-side warning generation unit 240 can be configured to make the driver recognize the warning by, for example, a vibration generation unit (not shown) such as a vibration motor generates vibration.

The warning signal input to the information processing unit 250 is wirelessly transmitted to the vehicle side warning generation unit 240 via the wireless transmitter 260. The vehicle-side warning generator 240 has a receiving function of receiving a warning signal wirelessly transmitted from the wireless transmitter 260, and is configured to issue a warning to the driver when the warning signal is received. be able to.

The wireless communication of the warning signal between the wireless transmitter 260 and the vehicle side warning generating unit 240 can be configured by using, for example, a specific low power radio station.

The vehicle-side warning generation unit 240 can also be integrally configured with the vehicle-mounted device 200. In this case, the vehicle-side warning generation unit 240 may be configured to transmit warning information to the driver by a warning sound, a warning light, a voice, or the like instead of vibration.

The information processing unit 270 of the in-vehicle device 200 may be connected to another system such as an automatic driving control system mounted on the vehicle, and the road-to-vehicle information communication system 1 may be linked with the other system. it can. For example, when the information processing unit 270 of the in-vehicle device 200 is connected to the automatic driving control system 400 mounted on the vehicle, the vehicle 4 is automatically controlled when the warning signal from the vehicle approach warning device 101 is input. The system 400 can be configured to automatically stop or decelerate. As a result, the safety of the worker 5 in the vehicle 4 or the work area 3 can be further enhanced.

As described above, according to the road-to-vehicle information communication system 1 of the present invention, the position information of the work area 3 set on the road 2 and the caution information regarding the work area 3 are transmitted to the vehicles 4 and 119 traveling on the road 2. By transmitting the information, the drivers of the vehicles 4 and 119 traveling around the work area 3 can be alerted to the driving. Further, the warning information that the vehicle 4 may jump into the work area 3 can be transmitted with high accuracy to the driver of the vehicle 4 who may jump in addition to the worker 5 in the work area 3. As a result, the safety of the worker 5 in the vehicle 4 or the work area 3 can be further enhanced.

FIG. 8 is a block diagram of a modified example of the road-to-vehicle information communication system shown in FIG. Further, FIG. 9 is an explanatory diagram schematically showing an example of installation of the road information presenting device shown in FIG. 8 on the road, and FIG. 10 is an explanatory diagram showing a modified example of the road information presenting device shown in FIG.

As in the road-to-vehicle information communication system 1 of the modified example shown in FIG. 8, a road information presenting device 300 that presents information on the road 2 can be used instead of the vehicle approach warning device 101 as an arrangement. That is, the road-to-vehicle information communication system 1 may be configured not to include the vehicle approach warning device 101.

The road information presenting device 300 can be, for example, a construction sign arranged on the road 2 as shown in FIG. In this case, the ITS fixing machine 102 is fixed to the road information presenting device 300, and the caution information about the road information presenting device 300 and the position information of the road information presenting device 300 are sent from the ITS fixing machine 102 toward the vehicles 4 and 119. Will be sent. As a result, the vehicles 4 and 119 traveling on the road 2 toward the work area 3 can be made to recognize that the work area 3 is located by the road information presenting device 300, and the work area 3 set on the road 2 can be recognized. The position information and the caution information regarding the work area 3 are wirelessly transmitted to the vehicles 4 and 119 traveling on the road 2 to warn the drivers of the vehicles 4 and 119 traveling around the work area 3 to drive. Can be prompted.

The road information presenting device 300 used as a construction sign is preferably configured to be provided with lighting in order to enhance visibility at night. In this case, the power supply of the ITS fixing machine 102 fixed to the road information presenting device 300 can be supplied from the road information presenting device 300.

Further, the road information presenting device 300 may be configured to input caution information regarding the work area 3 into the information processing unit 170 of the ITS fixing machine 102. As a result, by mounting the ITS fixing machine 102 on the road information presenting device 300, the caution information regarding the work area 3 can be easily transmitted from the ITS fixing machine 102 to the vehicles 4 and 119.

As shown in FIG. 10, for example, the road information presenting device 300 can be a construction vehicle that can travel on the road 2. Here, the construction vehicle is provided with a construction sign on the loading platform of the vehicle. Also in this case, the ITS fixing machine 102 is fixed to the construction sign of the loading platform of the construction vehicle designated as the road information presenting device 300, and the caution information regarding the road information presenting device 300 and the position information of the road information presenting device 300 are displayed. It is transmitted from the ITS fixing machine 102 toward the vehicles 4 and 119. As a result, the road information presenting device 300, which is regarded as a construction vehicle, is stopped in the work area 3, so that the vehicles 4 and 119 traveling on the road 2 toward the work area 3 are subjected to the work area by the road information presenting device 300. 3 can be recognized, and the position information of the work area 3 set on the road 2 and the caution information about the work area 3 are wirelessly transmitted to the vehicles 4 and 119 traveling on the road 2. , The drivers of vehicles 4 and 119 traveling around the work area 3 can be alerted to the traveling.

In the modified examples shown in FIGS. 8 to 10, the vehicle-mounted device 200 may not be provided with the vehicle-side warning generator 240 and the wireless transmitter 260.

Although details are not shown, a vehicle approach warning device 101 may be mounted as an arrangement on a construction sign or a construction vehicle which is a road information presentation device 300. With such a configuration, the vehicle approach warning device 101 can be arranged at a higher position on the road 2 as compared with the case where the tripod 130 is used. Therefore, for example, as shown in FIG. 5, a curve is formed on the road 2. In such cases, the detection range of the vehicle 4 by the Doppler radar 110 can be widened.

It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist thereof.

For example, in the above-described embodiment, the arrangement side information communication unit and the vehicle side information communication unit are configured to perform communication based on the standard communication standard for ITS, but the present invention is not limited to this, and other communication standards can be used. The communication may be based on the communication, and the communication standard does not matter.

Further, the vehicle approach warning device 101 is not limited to the one having the above configuration, and any other device may be used as long as it can warn the vehicle 4 to jump into the work area 3.

Further, the vehicle approach warning device 101 may be configured to include a video camera having a recording function. As this camera, when an impact of a predetermined acceleration or more is received, such as a so-called drive recorder, a camera that saves a moving image in a predetermined time range before the impact or a moving image in a predetermined time range before and after the impact is saved. It is preferable to use. By configuring the vehicle approach warning device 101 with such a camera, when the vehicle 4 jumps into the work area 3, the state of the vehicle 4's diving is recorded by the camera, and the cause of the diving is recorded. It can be used for investigations.

1 Road-to-vehicle information communication system 2 Roads 2a, 2b lanes 3 Work area (location requiring attention)
4 Vehicle 5 Worker 6 Roadside belt 7 Chuo Line 8 Pylon 100 Roadside machine 101 Vehicle approach warning device (arrangement)
102 ITS fixed machine 110 Doppler radar 111 Case 112 Radar control unit 112a Monitoring unit 113 Wireless transmitter 114 Radar operation board 115 Switching power supply 115a Power connector 116 External device 117 USB converter 118 Flat array antenna 118a Antenna surface 119 Vehicle 120 Warning generator 130 Tripod 140 Distance setting switch 141 Speed setting switch 150 GPS receiver (placement position detector)
160 ITS wireless communication unit (information communication unit on the arrangement side)
170 Information processing unit 171 Processor 172 Storage unit 173 GPS receiver inter-interface 174 Vehicle approach warning device inter-device interface 175 ITS wireless communication unit inter-interface 176 Road information presentation device inter-interface 200 In-vehicle device 210 ITS wireless communication unit (vehicle side information communication unit) )
220 Display unit 230 GPS receiver unit (vehicle position detection unit)
240 Vehicle side warning generator 250 Information processing unit 260 Wireless transmitter 300 Road information presentation device (arrangement)
400 Automatic operation control system

Claims (4)

It is a road-to-vehicle information communication system provided with a roadside machine arranged on a road on which a vehicle travels, and the roadside machine performs wireless information communication with an in-vehicle device mounted on the vehicle.
The roadside machine
An arrangement that is placed at the location requiring attention during the period when the location requiring attention exists on the road, and
An arrangement position detecting unit provided on the arrangement body and detecting the position of the arrangement body,
An arrangement-side information communication unit provided in the arrangement and wirelessly transmitting the position information of the arrangement and the caution information regarding the place requiring attention to the in-vehicle device, which is detected by the arrangement position detection unit, Yes, and
The in-vehicle device
A vehicle-side information and communication unit that receives the position information of the arrangement and the caution information regarding the location requiring attention, which are transmitted from the arrangement-side information and communication unit.
It has a display unit that displays the position information of the arrangement body received by the vehicle-side information communication unit and the caution information regarding the location requiring attention.
The arrangement is
A pulse radar type Doppler radar equipped with a planar array antenna and capable of detecting the speed of the vehicle at a position separated from the planar array antenna by a preset set distance.
A monitoring unit that outputs a warning signal when the speed of the vehicle detected by the Doppler radar at a position separated from the plane array antenna by a set distance is equal to or higher than a preset set speed.
It is a vehicle approach warning device having a warning generating unit that issues a warning when a warning signal output from the monitoring unit is input.
The set distance is set to the distance from an obstacle existing on the upstream side of the lane in which the vehicle travels to the plane array antenna.
The planar array antenna is installed so that the antenna surface of the planar array antenna is oriented so as to be perpendicular to the extending direction of the lane, and the pulse wave emitted by the Doppler radar is set from the planar array antenna. at a distance apart position, road-vehicle information communication system according to claim der Rukoto having a directivity of a degree that falls within the range of the width of the lane of the planar array antenna are arranged. The vehicle-mounted device has a vehicle-side warning generator that issues a warning when the warning signal is input.
The arrangement side information communication unit wirelessly transmits the warning signal to the vehicle side information communication unit, and the warning signal received by the vehicle side information communication unit is input to the vehicle side warning generation unit. The road-to-vehicle information communication system according to claim 1 , wherein the vehicle-side warning generating unit issues a warning. The vehicle-side warning generator is a portable terminal carried by the driver of the vehicle.
The road-to-vehicle information communication system according to claim 2 , wherein the warning signal received by the vehicle-side information communication unit is wirelessly transmitted to the vehicle-side warning generation unit by a wireless transmitter. The road-to-vehicle information communication system according to any one of claims 1 to 3 , wherein the place requiring attention is a work area of a construction site installed on the road.

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