JP2011210250A - Safe driving support system for traveling vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safe driving support system capable of supporting safe driving of a traveling vehicle at low cost while a distance and a direction between a road side machine and a traveling vehicle or between respective travelling vehicles are measured and a position of an own vehicle and a relative position relation with another vehicle are measured and the measured results are displayed at a front section of a driver's seat at real time.SOLUTION: The safe driving support system is provided with moving stations loaded on traveling vehicles 21a-21d, and road-side machines 22a, 22b arranged at a road side. The road-side machine intermittently transmits at least a radio signal containing a report signal to the moving stations 21aa-21db in an area. The moving station reproduces traffic regulation information contained in at least the report information by receiving the radio signal, and measures a relative position by measuring a relative distance and a located direction between the road-side machine and the surrounding moving station, and displays the traffic regulation information, the relative position between the road-side machine and the surrounding moving station, a warning perceiving a risk, and a combination of them, on a screen as necessary.

Description

The present invention measures the relative distance and direction with a traveling vehicle existing in the vicinity with high accuracy and instantly by one-way communication or time-division two-way communication, and the measurement result in the front part of the driver's seat. The present invention relates to a system for supporting safe driving of a traveling vehicle by displaying in real time.

Conventionally, a device for measuring a distance between vehicles or a system for supporting safe driving of a traveling vehicle has been proposed. (For example, see Patent Documents 1 to 5)
JP 2009-100061 JP 2001-1992257 JP 2005-115883 A JP 2005-190307 A Special table 2007-310457

  FIG. 6 shows an example of a conventional “ubiquitous mobile network” described in Patent Document 1. In FIG. 6, it comprises a plurality of mobile stations 21 to 23 mounted on vehicles traveling inside separation bands 101 and 102 indicating road sections and the like, and an arbitrary number of roadside machines 31 and 32 installed on the side of the road. It is said that an optimized ubiquitous mobile network can be configured by instantaneously measuring the relative distance between each other with high accuracy. However, regarding a system for supporting safe driving of traveling vehicles, Not mentioned.

  In the conventional “vehicle travel control device” described in Patent Document 2, the other vehicle travel detection unit 1 measures the distance from the preceding vehicle. The road-to-vehicle communication unit 2 receives inter-vehicle distance data indicating the position of the preceding vehicle traveling ahead of the host vehicle and the preceding vehicle from the roadside machine of the driving support system, and determines whether the preceding vehicle is based on the received data. Determine the distance between. The inter-vehicle distance control unit 5 causes the vehicle to follow the preceding vehicle by performing acceleration / deceleration control based on the inter-vehicle distance obtained from the preceding vehicle obtained from the other vehicle travel detection unit 1, and performs the acceleration / deceleration control. Although it is said that control is performed in consideration of the inter-vehicle distance obtained from the road-to-vehicle communication unit 2 with the preceding vehicle, there is a problem in measurement accuracy because the distance to the preceding vehicle is not directly measured.

  In the conventional “automatic vehicle driving method using a radio signal system” described in Patent Document 3, a road dedicated to automatic driving is divided into units of a certain length and a signal is transmitted to a vehicle entering each section. Install a wireless communication device. Further, a signal control center for systematic operation of signals is provided, and this is connected to a narrow area wireless communication apparatus in each section by a communication line. When the vehicle ahead is approaching the preceding vehicle, a speed limit signal is sent to the vehicle. In addition, it is changed according to the presence state of the vehicle. On the other hand, it is said that the vehicle is equipped with various devices necessary for automatic traveling and performs vehicle traveling speed control and route control by signals received from the narrow area wireless communication device. There is a problem in measurement accuracy because the distance between them is not directly measured.

  In the conventional “inter-vehicle distance measuring device” described in Patent Literature 4, the inter-vehicle distance measuring device receives first vehicle information transmitted wirelessly from a vehicle traveling in front of the same traveling lane. Means, second receiving means for receiving roadside transmitter information wirelessly transmitted from a roadside transmitter installed on the roadside of the road, computing means for calculating an inter-vehicle distance between the vehicle traveling ahead, The vehicle is provided with transmission means for wirelessly transmitting the speed, the inter-vehicle distance, and the roadside transmission device information as new forward vehicle information to a vehicle traveling behind in the same traveling lane. By using the time across the front, there is a problem in measurement accuracy because the inter-vehicle distance is not directly measured.

In the conventional “vehicle-to-vehicle communication system, vehicle-to-vehicle communication device, and control device” described in Patent Document 5, in the vehicle-to-vehicle communication system, the support control ECU constituting each vehicle-to-vehicle communication device is connected via a radio. The information on the moving object detected using the sonar and the camera and the information on the own vehicle detected using the GPS antenna and the vehicle speed sensor are transmitted to the inter-vehicle communication device mounted on the other vehicle and transmitted to the other vehicle. The same type of information transmitted from the on-vehicle communication device installed is received. Then, the support control ECU determines whether the moving object itself is based on the position information of the own vehicle and the position information of the moving object and the information of the other vehicle received from the other vehicle via the wireless device in the right-handed accident assistance process. It is said that it is a risk factor for the vehicle, and a warning is output according to the determination result, but information on a moving object detected using a sonar or camera, and a GPS antenna or a vehicle speed sensor are used. Since the information on the own vehicle detected in this way is used, the inter-vehicle distance is not directly measured, which causes a problem in measurement accuracy.

The present invention provides a distance and direction between the roadside machine and the mobile station, a distance and direction between the preceding vehicle and the following vehicle, a distance and direction between the host vehicle and the vehicle traveling on both sides, or These combinations are measured instantaneously by one-way communication or time-division two-way communication, and the relationship between the position of the host vehicle and the relative position between the front, rear, left and right vehicles is determined with high accuracy, and the front of the driver's seat The object is to provide a safe driving assistance system for a traveling vehicle at a low cost by displaying in real time.

  A safe driving support system for a traveling vehicle according to the present invention is at least traveling between a roadside machine installed on a roadside and a mobile station mounted on the traveling vehicle, or traveling around the mobile station mounted on the traveling vehicle. With other mobile stations, at least a radio signal including a distance measurement signal and a direction measurement signal is intermittently transmitted while periodically switching a plurality of antennas by one-way communication or time-division bidirectional communication.

The mobile station reproduces the distance measurement signal and the direction measurement signal from the received radio signal, and outputs the phase of the reproduced distance measurement signal and the direction measurement signal, received signal strength (RSSI), or both of the plurality. From the measurement results, the distance and direction between the roadside machine and the mobile station, the distance and direction between the preceding vehicle and the following vehicle, the vehicle traveling on both sides It is possible to measure the distance and direction from the vehicle, or a combination thereof, and display it in real time in the front part of the driver's seat.

According to the present invention, the distance and direction between the roadside machine and the mobile station, between the preceding vehicle and the following vehicle, between the own vehicle and the vehicles on both sides, or between them and the direction and direction thereof can be one-way communication or time. A safe driving support system for traveling vehicles is measured by instantaneous and highly accurate measurement using divided two-way communication, and the relationship between the position of the vehicle and the relative position with the surrounding vehicles is displayed in front of the driver's seat in real time. It can be configured at low cost.

68 A configuration diagram of a safe driving support system according to the first embodiment of the invention The block diagram of the safe driving assistance system by the 2nd Embodiment of this invention Configuration diagram of mobile station of safe driving support system of the present invention Configuration diagram of control means of the safe driving support system of the present invention Example of display screen of safe driving support system of the present invention Configuration diagram showing a conventional example

A safe driving support system for a traveling vehicle according to the present invention, as shown in FIG. 1 and claim 1 of the first aspect of the present invention, is a safe driving support system for a traveling vehicle using a radio signal. The first mobile station mounted on the rear part of the traveling vehicle and the first display means provided in the periphery of the dashboard, and the second mobile station mounted on the front part of the second traveling vehicle and the periphery of the dashboard Second display means provided in the section,
The first mobile station has first transmission / reception means for measuring a distance from the second mobile station and a direction in which the second mobile station is located; Mobile stations have second transmitting / receiving means for measuring the distance to the first mobile station and the direction in which the first mobile station is located.

A distance measuring means for measuring at least a relative distance between the first transmitting / receiving means and the second transmitting / receiving means; Direction measuring means for measuring a relative direction between the first transmitting / receiving means and the second transmitting / receiving means,
From the measurement results of the relative distance and direction on both sides of the first mobile station and the second mobile station, the relative positional relationship between the first mobile station and the second mobile station is determined. Positioning is performed with high accuracy, and the relative positional relationship is displayed on the first display means and the second display means.

Further, as shown in FIG. 5 and claim 2, the display means displays at least a relative positional relationship with a traveling vehicle located in the vicinity, and a relative distance with the traveling vehicle located in the vicinity is defined. When the distance is less than the distance between the vehicles, a warning is displayed, the registration number of the traveling vehicle located in the vicinity is displayed, or a combination thereof is displayed.
According to a third aspect of the present invention, when the traveling vehicle has speed control means and the positional relationship with the preceding vehicle is equal to or less than a predetermined inter-vehicle distance, the speed of the host vehicle is controlled to determine the inter-vehicle distance. Control within the value of.

In addition, as shown in claim 4, the mobile station measures a relative distance and direction from a wireless tag carried by a pedestrian walking on a sidewalk or a pedestrian crossing, and the display means includes at least the walking The relative positional relationship with the person is displayed.
In addition, as shown in claim 5, the mobile station measures a relative distance and direction from a roadside device installed on the roadside, and displays the position of the host vehicle on the road map on the display means. .

Further, according to a sixth aspect of the present invention, the mobile station has means for mechanically measuring a travel distance, means for mechanically detecting a travel direction, or both, and is relative to the roadside machine. Correct or supplement the measurement of the correct distance and direction.
Further, as shown in claim 7, the mobile station is mounted on the front and rear of the traveling vehicle, and the position information measured by the front mobile station is transmitted to the following vehicle via the rear mobile station. Relay or send.

(Embodiment 1)
FIG. 1 is a configuration diagram of a safe driving support system according to a first embodiment of the present invention. In FIG. 1, reference numerals 201, 202, and 203 denote separation zones indicating road divisions, 21a to 21d are traveling vehicles, 21aa to 21db are mobile stations, 22a and 22b are roadside machines, and 23a to 23d are roadside machines and mobile stations. The propagation paths 23e and 23f are the propagation paths between the mobile stations.

  A safe driving assistance system for a traveling vehicle using a radio signal includes at least mobile stations 21aa to 21db mounted in front of the traveling vehicles 21a to 21d and roadside units 22a and 22b installed on the roadside. The devices 22a and 22b move radio signals including at least a system synchronization signal, an identification signal, a notification signal, a distance measurement signal, and a direction measurement signal through the propagation paths 23a to 23d in the area. When intermittent transmission is performed toward the stations 21aa to 21db, the mobile stations 21aa, 21ba, 21ca, and 21da receive the radio signal while switching a plurality of antennas, and at least traffic information or traffic regulation information included in the broadcast information , And the distance and direction from the roadside machine are measured in real time and illustrated in FIG. 5 as necessary. It is displayed on the 示画 surface.

On the other hand, each mobile station transmits at least a system synchronization signal, an identification signal, a distance measurement signal, and a direction measurement signal to one of the surrounding mobile stations by one-way communication or time-division bidirectional communication at random timing. Is transmitted intermittently while periodically switching a plurality of antennas, and the distance and direction between them are measured in real time and displayed on the display screen illustrated in FIG. 5 as necessary. can do.

(Embodiment 2)
FIG. 2 is a configuration diagram of a safe driving support system according to the second embodiment of the present invention. In FIG. 2, 202 and 203 are separation zones indicating road divisions, 21a is a preceding vehicle, 21ab to 21ad are mobile stations for the preceding vehicle, 21b is a following vehicle, and 21ba to 21bb are mobile stations for the following vehicle. , 23ac-23bd are propagation paths between the mobile station of the preceding vehicle and the mobile station of the subsequent vehicle.

  A mobile vehicle safe driving support system using a radio signal is mounted at least on the mobile stations 21aa to 21ad mounted on the front and rear of the preceding vehicle 21a and on the front and rear of the rear vehicle 21b. It is assumed that mobile stations 21ac and 21ad, which are configured from 21ba to 21bd and are mounted behind the preceding vehicle 21a, are opposed to mobile stations 21ba and 21bb which are mounted in front of the following vehicle 21b.

  The preceding vehicle 21a and the following vehicle 21b are traveling in the same lane, and the mobile station 21ba in front of the following vehicle 21b includes at least a system synchronization signal, an identification signal, a distance measurement signal, When a radio signal including a direction measurement signal is intermittently transmitted as a burst signal toward the mobile stations 21ab and 21ad behind the preceding vehicle 21a while periodically switching a plurality of antennas, the front of the following vehicle 21b is transmitted. Mobile stations 21ba and 21bb receive the radio signal, reproduce the distance measurement signal and the direction measurement signal, measure the relative distance between the distance measurement signal and the preceding vehicle 21a, and measure the direction. The direction in which the preceding vehicle 21a is located is measured from the signal, the relative position with respect to the preceding vehicle 21a is determined from the measurement result of the relative distance and direction, and if necessary, FIG. It can be displayed on the display screen shown.

Similarly, when the relative positions of the mobile station 21bb in front of the following vehicle 21b and the mobile stations 21ac and 21ad in the rear of the preceding vehicle 21a are measured with high accuracy, the preceding vehicle 21a is obtained. Since a total of four relative positions can be measured between the vehicle and the following vehicle 21b, for example, selecting a relatively short measured distance and taking an average affects the multipath. This makes it possible to measure the relative position with high accuracy and high reliability.
In addition, the interval of intermittent transmission from the mobile station, the roadside device, or both of them is controlled by a self-excited oscillator, controlled according to a change in the moving speed of the mobile station, or the moving speed of the mobile station is fast In this case, the probability of collision with each other can be reduced by controlling the interval between intermittent transmissions to be narrow.

  Further, the mobile station of the traveling vehicle has the display means shown in FIG. 5, and reproduces and displays at least the traffic regulation information included in the notification information intermittently transmitted from the roadside device on the display means, and measures it. The current position on the road of the vehicle is calculated and displayed from the relative position between the roadside machine and the mobile station, and the positional relationship with other traveling vehicles in the vicinity is calculated and displayed. A warning that the relative distance to the vehicle is equal to or less than the determined inter-vehicle distance can be displayed, a warning sound can be generated, a registration number of the traveling vehicle can be displayed, or a combination thereof can be performed.

  Also, a pedestrian walking along a sidewalk or a pedestrian crossing carries a wireless tag, and the wireless tag bursts a wireless signal including at least a system synchronization signal, an identification signal, and a positioning request signal toward the mobile station. A mobile station intermittently transmitting as a signal and receiving the wireless signal transmits a wireless signal including a starting signal toward the wireless tag, and a distance measurement signal synchronized with the starting signal received by the wireless tag, In addition to transmitting a radio signal including a direction measurement signal, the mobile station receives a radio signal while periodically switching a plurality of antennas, and generates the phase signal of the reproduced distance measurement signal as the generated origin signal. Measure as a reference, measure the phase of the direction measurement signal corresponding to a plurality of antennas, determine the relative position with the wireless tag from the measurement results of the relative distance and direction, from the results of positioning It displays a proximity warning on the screen, or emits a warning sound.

Further, the mobile station of the traveling vehicle, the wireless tag carried by the pedestrian, or both of them have storage means for storing immediately preceding information including at least a communication record or an alarm record, and the mobile station, the wireless tag Or when both of them encounter a traffic accident, the storage means has a protection means for protecting the storage of the immediately preceding information.
The origin signal, distance measurement signal, direction measurement signal, or combination thereof transmitted from the roadside device or mobile station is a carrier signal, subcarrier signal, modulation signal, spread spectrum code, or combination thereof.

  Further, the receiver of the mobile station, the receiver of the roadside device, or both of them have a quality detection means for detecting the quality of the propagation path, and the quality detection means receives the radio signal received by the receiver. The line quality is analyzed from the result of measuring the power or the signal-to-noise ratio, and the calculation result of the relative distance, the calculation result of the direction in which the signal is located, or both the results are filtered, corrected, or complemented.

Also, a specific roadside machine in the roadside machine is used as a node, connected to an external wired line or a wireless line via the node, and at least exchange of information necessary for positioning the mobile station , Exchanging information as a result of positioning the mobile station, or both.
In addition, when the mobile station is mounted on a large vehicle and the following vehicle is a passenger car, the roadside machine may not be seen from the passenger car. Therefore, the mobile station at least receives the notification received from the roadside machine. By relaying or transmitting the information and the detected position information of the own station to the subsequent vehicle, the information can be transmitted without interfering with the subsequent vehicle.

FIG. 3 is a configuration diagram of a mobile station of the safe driving support system of the present invention, in which 21a is a first mobile station, 21b is a second mobile station, 11a and 11b are control means, 12a and 12b are transmitters, and 13a. , 13b are receivers, 14a and 14b are antenna switching means, 15a and 15b are antennas, 16a and 16b are display means, and 41 is a radio signal propagation path.
In order to identify the relative position between the first mobile station 21a and the second mobile station 21b, the first mobile station 21a includes a control means 11a, a transmitter 12a, a receiver 13a, an antenna, The second mobile station 21b includes a switching unit 14a, a plurality of antennas 15a1 and 15a2, and the second mobile station 21b includes a control unit 11b, a transmitter 12b, a receiver 13b, an antenna switching unit 14b, and a plurality of antennas 15b1. 15b2.

  In the second mobile station 21b, a radio signal including at least the first distance measurement signal generated by the control means 11b from the transmitter 12b is burst while the plurality of antennas 15b1 and 15b2 are periodically switched by the antenna switching means 14b. First distance measurement received intermittently as a signal, received by the receiver 13a while periodically switching the plurality of antennas 15a1 and 15a2 by the antenna switching means 14a in the first mobile station 21a, and received by the control means 11a A signal is reproduced, a second distance measurement signal synchronized with or orthogonal to the reproduced first distance measurement signal with high accuracy and a direction measurement signal are generated separately from the second distance measurement signal, and the generated second distance measurement signal is generated. A radio signal including a signal and a direction measurement signal is transmitted from a plurality of antennas 15a1 and 15a2 to an antenna switching unit 14a. Thus in time division from periodically switched while the transmitter 12a transmits a burst signal.

  On the other hand, in the second mobile station 21b, the radio signal is received by the receiver 13b while periodically switching the plurality of antennas 15b1 and 15b2 by the antenna switching unit 14b, and the control unit 11b receives the first mobile station 21b. The distance measurement signal and the direction measurement signal are reproduced, and the phase of the reproduced first distance measurement signal is measured with reference to the first distance measurement signal generated by the own station 21b. And calculating the direction in which the first mobile station 21a is located by measuring the phase difference of the direction measurement signal corresponding to the plurality of antennas 15b1 and 15b2, or calculating the distance measurement Instead of measuring the phase of the signal, the received signal strength (RSSI) of the received distance measurement signal is measured, and the relative distance is calculated by calculating the coupling loss between the antennas. Identifying the relative position between the first mobile station 21a in the direction of the calculation result, and displays the transmission result on the display unit 16b to.

  Similarly, in the second mobile station 21b, a third distance measurement signal that is synchronized with or orthogonal to the second distance measurement signal with high accuracy is continuously generated, and at least the control is performed from the transmitter 12b. A radio signal including the third distance measurement signal generated in the means 11b and a direction measurement signal generated separately is transmitted in a time division manner as a burst signal while periodically switching the plurality of antennas 15b1 and 15b2 by the antenna switching means 14b. .

  In the first mobile station 21a, the radio signal is received by the receiver 13a while periodically switching the plurality of antennas 15a1 and 15a2 by the antenna switching unit 14a, and the control unit 11a performs the third distance measurement. The signal is reproduced, and the phase of the reproduced third distance measurement signal is measured on the basis of the second distance measurement signal generated by the own station 21a, and the relative distance from the second mobile station 21b is determined. Calculate and measure the phase difference of the direction measurement signal corresponding to the plurality of antennas 15a1 and 15a2 to calculate the direction in which the second mobile station 21b is located, or measure the phase of the distance measurement signal Instead, the received signal strength (RSSI) of the distance measurement signal is measured, the relative distance is calculated by calculating the coupling loss between the antennas, and the calculation result of the distance and direction Identifying the relative position between et the second mobile station 21b, and displays and transmits the result to the display unit 16a of the.

In addition, it becomes possible to improve the calculation accuracy of the relative position by exchanging position information between the first mobile station 21a and the second mobile station 21b and obtaining an average value of both. .
Further, following the above, by continuing mutual communication between the first mobile station 21a and the second mobile station 21d, the distance and direction are calculated a plurality of times, and the average value is obtained. As a result, the calculation accuracy of the position can be improved.
Further, the first to third distance measurement signals, direction measurement signals, or combinations thereof are within a frequency range permitted by law, and a carrier signal, subcarrier signal, modulation signal, spread spectrum code, or Any combination of these.

FIG. 4 is a block diagram of the control means of the safe driving support system of the present invention. 11a and 11b are control means, 41 is a reference oscillator, 42 is a measurement signal generation means, 43 is a measurement signal regeneration means, and 44 is a distance measurement means. , 45 are direction measuring means, 46 is a position calculating means, and 51 and 50 are connection terminals.
At least the system synchronization signal, the mac layer, the first to third distance measurement signals, and the direction measurement signal are generated by the measurement signal generation means 42, and the transmitter 12a shown in FIG. , 12b, and the first and second distance measurement signals are separately supplied to the distance measuring means 44 as a reference for distance measurement.

  On the other hand, the radio signals received by the receivers 13a and 13b shown in FIG. 3 are converted directly or into an intermediate frequency signal and supplied to the measurement signal reproducing means 43 via the connection terminal 52, and the distance measurement signal and direction A measurement signal is reproduced and supplied to the distance measurement unit 44 and the direction measurement unit 45, and the distance measurement unit 44 uses the first distance measurement signal or the second distance measurement signal as a reference for the second distance. The phase of the measurement signal or the third distance measurement signal is measured, and the relative distance between the first mobile station 21a and the second mobile station 21d is instantaneously calculated with high accuracy.

Further, the direction measuring means 45 measures the phase of the direction measurement signal corresponding to the plurality of antennas 15a1, 15a2, or 15b1, 15b2, and the first mobile station 21a and the second mobile station 21d. The relative position between the first mobile station 21a and the second mobile station 21d is calculated from the distance and direction calculation results, and is displayed via the connection terminal 53. Output to the means.
Instead of measuring the phase of the distance measurement signal, the received signal strength (RSSI) of the distance measurement signal is measured, and the coupling loss between the antennas is calculated, thereby the first mobile station 21a and the second mobile station 21a. The distance to the mobile station 21d can be measured.

FIG. 5 is an example of a display screen of the safe driving support system of the present invention, 16 is a display means, 17 is traffic regulation information, 18a to 18c are vehicle intervals, and 21a to 21d are traveling vehicles. The traffic regulation information 17 acquired from the roadside machine, the positions of the surrounding vehicles 21a to 21d (vehicle numbers are also displayed), the inter-vehicle distances 18a to 18c, etc. are displayed centering on the own vehicle 21b. Note that a wide variety of actual displays can be considered.

In the above description, between a plurality of mobile stations mounted on a vehicle traveling on a road and between a roadside machine and a mobile station, a mobile terminal and a mobile station carried by a pedestrian walking on a sidewalk Similarly, a safe driving support system for a traveling vehicle can be configured.
In the safe driving support system for a traveling vehicle, an ad hoc mobile network or an autonomous distributed mobile network is configured between an arbitrary number of mobile stations and an arbitrary number of roadside devices.

In addition, wireless signals are transmitted and received while periodically switching between a plurality of antennas of a mobile station and a roadside unit, and relatively short phrase measurement data is selected from relative distances measured via a plurality of propagation paths. By obtaining the average value, it is possible to reduce the position specifying error caused by multipath.
In addition to the function to measure relative distance or relative position, it is equipped with a data communication function that includes voice information or image information, or moves such as coordinated driving, collision prevention, road information transfer, and warnings that detect danger. A function for exchanging necessary information between stations can be included.

It is also possible to access the Internet network using a specific roadside device as a node.
In addition, an ultrasonic signal, a high-frequency signal, or an optical signal can be used as a radio signal. In the case of an ultrasonic signal or an optical signal, a transducer is used instead of the antenna.
Further, when the mobile station has a means for mechanically measuring a travel distance, a means for mechanically detecting a travel direction, a geomagnetic sensor, an acceleration sensor, or a combination thereof, it is relative to the roadside device. Correct distance and direction measurements can be corrected or supplemented.

  Since the present invention is configured as described above, a plurality of vehicles mounted on a road or the like between a roadside device installed on the side of the road and a mobile station mounted on a vehicle or the like traveling on the road. It can be used in a safe driving support system for a traveling vehicle by measuring a relative distance and a direction in which a mobile station, an RF tag carried by a pedestrian or between a mobile terminal and a mobile station, or a combination thereof is used. .

In addition, information or warnings such as traffic information on roads to be traveled, traffic regulations, cooperative driving between traveling vehicles or prevention of collision, etc. can be used as a means for exchanging between roadside units and vehicles or between vehicles and vehicles. it can.
Further, the present invention relates to a basic technology, and can be applied to various fields other than the above.

21a to 21d mobile vehicles 21aa to 21db mobile stations 22a and 22b roadside devices 23a to 23f radio signal propagation paths 201, 202, 203 traveling lane separation zones 11a, 11b control means 12a, 12b transmitters 13a, 13b receivers 14a, 14b Antenna switching means 15a, 15b Antenna 41 Radio signal propagation path

Claims (7)

A safe driving support system for a traveling vehicle using a radio signal includes at least a first mobile station mounted on a rear portion of the first traveling vehicle and a first display means provided in a dashboard peripheral portion; A second mobile station mounted on the front of the traveling vehicle and a second display means provided in the dashboard periphery,
The first mobile station has first transmission / reception means for measuring a distance from the second mobile station and a direction in which the second mobile station is located; A second transmitting and receiving means for measuring a distance from the first mobile station and a direction in which the first mobile station is located,
A distance measuring means for measuring at least a relative distance between the first transmitting / receiving means and the second transmitting / receiving means; Direction measuring means for measuring a relative direction between the first transmitting / receiving means and the second transmitting / receiving means,
From the measurement results of the relative distance and direction on both sides of the first mobile station and the second mobile station, the relative positional relationship between the first mobile station and the second mobile station is determined. A safe driving assistance system for a traveling vehicle, characterized by positioning and displaying the relative positional relationship on the first display means and the second display means.
The display means displays at least a relative positional relationship with a traveling vehicle located in the vicinity, and displays a warning when the relative distance from the traveling vehicle located in the vicinity is equal to or less than a prescribed inter-vehicle distance. 2. The safe driving support system for a traveling vehicle according to claim 1, wherein a registration number of a traveling vehicle located in the vicinity is displayed or a combination thereof is displayed.
The traveling vehicle has speed control means, and when the positional relationship with the preceding vehicle is equal to or less than a predetermined inter-vehicle distance, the inter-vehicle distance is controlled within a predetermined value by controlling the speed of the hourly vehicle. The safe driving support system for a traveling vehicle according to claim 1.
The mobile station measures a relative distance and direction from a wireless tag carried by a pedestrian walking on a sidewalk or pedestrian crossing, and displays at least a relative positional relationship with the pedestrian on the display means. The safe driving support system for a traveling vehicle according to claim 2, wherein:
3. The mobile station measures a relative distance and direction from a roadside device installed on a roadside, and displays a position of the host vehicle on a road map on the display means. A safe driving support system for a traveling vehicle described in 1.
The mobile station has means for mechanically measuring a travel distance, means for mechanically detecting a travel direction, or both of them, and corrects the measurement of the relative distance and direction with the roadside machine. Or it supplements, The safe driving assistance system of the traveling vehicle described in Claim 5 characterized by the above-mentioned.
  The mobile station is mounted on the front and rear of the traveling vehicle, and the positional information measured by the front mobile station is relayed or transmitted to the following vehicle via the rear mobile station. A safe driving support system for a traveling vehicle according to claim 1.

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