JP2016151960A - Moving person position detection system and on-vehicle communication apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a moving person position detection system capable of detecting the position of a moving person with precision higher than that of a GPS mounted on a mobile communication terminal without being influenced by the existence of an obstacle.SOLUTION: A moving person position detection system includes: multiple on-vehicle communication apparatuses 1 for performing inter-vehicle communication; and a mobile communication terminal 2 for performing radio communication with the multiple on-vehicle communication apparatuses 1. The on-vehicle communication apparatus 1 detects a distance between the self apparatus and the mobile communication terminal 2 by radio communication. The on-vehicle communication apparatus 1 also detects the position of a vehicle where the self apparatus is mounted. The multiple on-vehicle communication apparatuses 1 mutually exchange distance information indicating the detected distances and position information indicating the positions of the vehicles. The on-vehicle communication apparatus identifies the position of a moving person outside the vehicle on the basis of the positions of the respective vehicles and the distances from the mobile communication terminal 2 with respect to the respective vehicles.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a mobile position detection system that detects the position of a mobile communication terminal, and an in-vehicle communication device that constitutes the mobile position detection system.

  There is a vehicle pedestrian detection system that notifies the driver of a vehicle of the position of the mobile communication terminal in order to prevent a collision between the owner of the mobile communication terminal and the vehicle (for example, Patent Document 1). The vehicle pedestrian detection system includes a mobile communication terminal and a navigation device mounted on the vehicle. The mobile communication terminal includes a position detection unit that detects its own position. When it is determined that the owner of the mobile communication terminal is walking, the detected position information is wirelessly transmitted to the navigation device via the base station. To do. For example, the position detection unit detects the position of the mobile communication terminal based on the configuration of detecting the position by GPS (Global Positioning System), the radio wave intensity of the signal transmitted / received to / from the wireless base station, or the communication time. And the like. The navigation device receives the position information of the mobile communication terminal transmitted from the base station, and calculates the distance between the navigation device and the mobile communication terminal. When the calculated distance is less than the predetermined distance, the navigation device notifies the driver of the position of the mobile communication terminal.

Japanese Patent No. 4274054

However, in the vehicle pedestrian detection system of Patent Document 1, the position detection accuracy of the GPS mounted on the mobile communication terminal is low, and the position detection accuracy using the wireless base station is greatly affected by the obstacle. there were.
Therefore, by using wireless communication with the mobile communication terminal and inter-vehicle communication, the position of the mobile person can be detected with higher accuracy than the GPS mounted on the mobile communication terminal, regardless of the presence of obstacles. It is an object of the present invention to provide a mobile position detection system and an in-vehicle communication device that can perform communication.

  A mobile position detection system according to an aspect of the present invention includes a plurality of in-vehicle communication devices that perform vehicle-to-vehicle communication, and a mobile communication terminal that performs wireless communication with the plurality of in-vehicle communication devices. A mobile position detection system for detecting the position of a mobile person outside the vehicle carrying the mobile communication terminal based on a communication result of the communication terminal, wherein the in-vehicle communication device and the mobile communication terminal are wirelessly communicated with each other. A distance detection unit that detects the distance between the position detection unit, a position detection unit that detects the position of the vehicle on which the vehicle is mounted, distance information indicating the distance detected by the distance detection unit, and detection by the position detection unit A transmitter that transmits position information indicating the position of the vehicle to the other in-vehicle communication device, distance information indicating the distance between the other in-vehicle communication device and the mobile communication terminal, and the other in-vehicle communication device are mounted. Vehicle A receiving unit that receives position information indicating a position; a distance detected by the distance detecting unit; a position detected by the position detecting unit; and a distance and position information indicated by the distance information received by the receiving unit. And a specifying unit that specifies the position of the mobile communication terminal based on the indicated position.

  An in-vehicle communication device according to an aspect of the present invention is an in-vehicle communication device that detects a position of a mobile communication terminal possessed by a person outside the vehicle, and detects a distance between the mobile communication terminal and the mobile communication terminal by wireless communication. A distance detector that detects the position of the vehicle on which it is mounted, distance information indicating the distance detected by the distance detector, and the position of the vehicle detected by the position detector A transmitter that transmits position information to another in-vehicle communication device, distance information indicating a distance between the other in-vehicle communication device and the mobile communication terminal, and a position of a vehicle on which the other in-vehicle communication device is mounted A receiving unit that receives position information, a distance detected by the distance detecting unit, a position detected by the position detecting unit, a position indicated by the position information received by the receiving unit, and a distance indicated by the distance information Based on the above And a specifying unit for specifying a location of the communication terminal.

  The present application can be realized not only as a mobile position detection system and an in-vehicle communication device having such a characteristic processing unit, but also as a mobile position detection method using such characteristic processing as a step. Or can be realized as a program for causing a computer to execute such steps. Further, it can be realized as a semiconductor integrated circuit that realizes a part or all of the in-vehicle communication device, or can be realized as another system including the in-vehicle communication device.

  According to the above, it is possible to provide a mobile position detection system and an in-vehicle communication device that can detect the position of a mobile person with higher accuracy than GPS installed in a mobile communication terminal without being influenced by the presence of an obstacle. It becomes possible.

It is a conceptual diagram which shows the example of 1 structure of the moving person position detection system which concerns on Embodiment 1 of this invention. It is a block diagram which shows one structural example of a vehicle-mounted communication apparatus. It is a block diagram which shows the example of 1 structure of a mobile communication terminal. It is a flowchart which shows the procedure of a person's position detection and a warning. It is a flowchart which shows the procedure of a sharing process of terminal distance information and vehicle position information. It is a block diagram which shows one structural example of the mobile communication terminal which concerns on Embodiment 2 of this invention. It is a flowchart which shows the procedure of the movement position detection and warning which concern on Embodiment 2 of this invention. It is a conceptual diagram which shows one structural example of the moving person position detection system which concerns on Embodiment 3 of this invention. It is a block diagram which shows the example of 1 structure of a roadside communication apparatus. It is a flowchart which shows the procedure of the correction process of a vehicle position.

[Description of Embodiment of the Present Invention]
First, embodiments of the present invention will be listed and described. Moreover, you may combine arbitrarily at least one part of embodiment described below.

(1) A mobile position detection system according to an aspect of the present invention includes a plurality of in-vehicle communication devices that perform vehicle-to-vehicle communication, and a mobile communication terminal that performs wireless communication with the plurality of in-vehicle communication devices. A mobile position detection system for detecting a position of a mobile person outside the vehicle carrying the mobile communication terminal based on a communication result of the apparatus and the mobile communication terminal, wherein the in-vehicle communication device communicates with itself by wireless communication. A distance detection unit that detects a distance from the mobile communication terminal, a position detection unit that detects a position of a vehicle on which the mobile communication terminal is mounted, distance information that indicates a distance detected by the distance detection unit, and the position detection unit Transmitting the position information indicating the position of the detected vehicle to the other in-vehicle communication device, distance information indicating the distance between the other in-vehicle communication device and the mobile communication terminal, and the other in-vehicle communication device Is installed A receiver that receives position information indicating the position of the vehicle, a distance detected by the distance detector, a position detected by the position detector, and a distance and a position indicated by the distance information received by the receiver A specifying unit that specifies the position of the mobile communication terminal based on the position indicated by the information.

In this aspect, each in-vehicle communication device detects the distance between itself and the mobile communication terminal by the distance detection unit. That is, each in-vehicle communication device can detect the distance between the vehicle on which it is mounted and the owner who owns the mobile communication terminal. Each in-vehicle communication device detects the position of the vehicle on which it is mounted by the position detection unit.
And each vehicle-mounted communication apparatus mutually transmits / receives the distance information which shows the distance with a mobile communication terminal, and the positional information which shows the position of a vehicle in a transmission part and a receiving part. That is, each in-vehicle communication device exchanges and shares the distance information and the position information obtained by the vehicle in which it is mounted. Therefore, each in-vehicle communication device has not only its own position and distance to the mobile person, but also information on the position of the vehicle on which the other in-vehicle communication device is mounted and the distance between the vehicle and the mobile person.
The identification unit of the in-vehicle communication device is a mobile that possesses the mobile communication terminal based on the position of the vehicle in which the in-vehicle communication device is mounted, the position of the vehicle in which the other in-vehicle communication device is mounted, and the distance of the mobile communication terminal to each vehicle Specify the position of.
Therefore, the in-vehicle communication device can detect the position of a person outside the vehicle carrying the mobile communication terminal even when the mobile communication terminal does not have a position detection function or when the position detection accuracy is poor. it can.
In addition, since the in-vehicle communication device is configured to identify the position of the mobile person by wireless communication with the mobile communication terminal and inter-vehicle communication, wireless communication with the base station is unnecessary, and the mobile person's position detection accuracy is , Not affected by the presence of obstacles.

(2) The specifying unit repeatedly specifies the position of the mobile communication terminal, and further includes a storage unit that stores map information indicating the position of the roadway, and map information stored in the storage unit. A determination unit that determines whether or not the position of the mobile communication terminal specified by the specifying unit is moving to the roadway, and outputs a warning if it is determined that the determination unit is moving to the roadway A configuration including an output unit is preferable.

  In this aspect, the in-vehicle communication device can recognize the moving direction of the mobile communication terminal by repeatedly specifying the position of the mobile communication terminal. Moreover, since the memory | storage part has memorize | stored the map information which shows the position of a roadway, the determination part of a vehicle-mounted communication apparatus determines whether the mobile communication terminal is moving toward a roadway using map information. be able to. When the moving person is moving toward the roadway, the output unit outputs a warning because the moving person and the vehicle may collide. The output warning is notified to the driver of the vehicle, for example, by voice, light, display, or the like.

(3) The mobile communication terminal includes a speed detection unit that detects a speed at which the mobile communication terminal moves, and a speed information transmission unit that transmits speed information indicating the speed detected by the speed detection unit. A speed information receiving unit that receives speed information transmitted from the mobile communication terminal, a storage unit that stores map information indicating the position of a roadway, map information stored in the storage unit, and the speed information receiving unit A determination unit that determines whether or not the position of the mobile communication terminal specified by the specifying unit is moving to the roadway based on the speed indicated by the speed information received, and the determination unit moves to the roadway When it determines with having, it is preferable to have a configuration including an output unit that outputs a warning.

  In this aspect, the mobile communication terminal detects its own speed at the speed detection unit, and the speed information transmission unit transmits speed information indicating the detected speed to the in-vehicle communication device. The speed information receiving unit of the in-vehicle communication device receives speed information transmitted from the mobile communication terminal. Similar to aspect 2, the determination unit of the in-vehicle communication device can determine whether or not the mobile communication terminal is moving toward the road using the map information. When the moving person is moving toward the roadway, the output unit outputs a warning because the moving person and the vehicle may collide.

(4) The output unit preferably outputs a warning when the distance between the position specified by the specifying unit and the position detected by the position detection unit is less than a predetermined distance.

  In this aspect, when the distance between the vehicle on which the in-vehicle communication device is mounted and the mobile communication device is less than a predetermined distance, the output unit outputs a warning. That is, no warning is output when the distance is greater than or equal to the predetermined distance. It is possible to prevent an unnecessary warning from being output when the moving person is away from the vehicle by a predetermined distance or more and there is no risk of collision.

(5) It is preferable that the position of the mobile communication terminal specified by the specifying unit is a three-dimensional position including a height with respect to a plane including the positions of three or more in-vehicle communication devices.

In this aspect, the specifying unit can specify the three-dimensional position of the mobile communication terminal.
If the position of the moving person can be identified three-dimensionally, the in-vehicle communication device discriminates the moving person actually moving toward the roadway and the moving person moving on the pedestrian bridge intersecting the roadway. It becomes possible.

(6) It is installed on the roadside, and includes a roadside communication device that performs road-to-vehicle communication with the in-vehicle communication device, and the roadside communication device includes a position information transmission unit that transmits position information indicating its own position, The in-vehicle communication device includes a road-to-vehicle distance detection unit that detects a distance between itself and the roadside communication device by road-to-vehicle communication, a position information reception unit that receives position information transmitted from the roadside communication device, and the road A configuration including a correction unit that corrects the position detected by the position detection unit based on the distance detected by the inter-vehicle distance detection unit and the position indicated by the position information received by the position information reception unit is preferable. .

In this aspect, the road-to-vehicle distance detection unit of the in-vehicle communication device detects the distance between itself and the roadside communication device by road-to-vehicle communication. Further, the roadside communication device can transmit position information indicating its own position to the in-vehicle communication device, and the in-vehicle communication device receives the position information transmitted from the roadside communication device. Since the roadside communication device is fixed, the position information transmitted from the roadside communication device is information having high position accuracy.
The in-vehicle communication device corrects the position detected by the position detection unit based on the distance detected by the road-to-vehicle distance detection unit and the position of the roadside communication device indicated by the position information received by the position information reception unit. . Therefore, more accurate vehicle position information can be obtained. Therefore, the accuracy of the position of the mobile communication terminal specified by the specifying unit is also improved.

(7) An in-vehicle communication device according to an aspect of the present invention is an in-vehicle communication device that detects a position of a mobile communication terminal possessed by a mobile person outside the vehicle, and is wirelessly communicated between itself and the mobile communication terminal. A distance detection unit that detects a distance; a position detection unit that detects a position of a vehicle on which the vehicle is mounted; distance information that indicates a distance detected by the distance detection unit; and a vehicle that is detected by the position detection unit. A transmitter that transmits position information indicating a position to another in-vehicle communication device, distance information indicating a distance between the other in-vehicle communication device and the mobile communication terminal, and a vehicle in which the other in-vehicle communication device is mounted. A receiving unit that receives position information indicating a position; a distance detected by the distance detecting unit; a position detected by the position detecting unit; a position indicated by the position information received by the receiving unit; and the distance information. Based on the distance shown And a specifying unit configured to specify the position of the serial mobile communication terminal.

  In this aspect, as in aspect 1, the in-vehicle communication device is connected to the outside of the vehicle carrying the mobile communication terminal even when the mobile communication terminal does not have a position detection function or the position detection accuracy is poor. The position of the mover can be detected. Further, the position detection accuracy of the moving person is not affected by the presence of an obstacle.

[Details of the embodiment of the present invention]
A specific example of a mobile position detection system according to an embodiment of the present invention will be described below with reference to the drawings. In addition, this invention is not limited to these illustrations, is shown by the claim, and intends that all the changes within the meaning and range equivalent to a claim are included.

(Embodiment 1)
FIG. 1 is a conceptual diagram showing a configuration example of a moving person position detection system according to Embodiment 1 of the present invention. The moving person position detection system includes a plurality of in-vehicle communication devices 1 that perform inter-vehicle communication and a mobile communication terminal 2 that performs wireless communication with the plurality of in-vehicle communication devices 1. The mobile communication terminal 2 is a terminal possessed by a traveler A outside the vehicle. The traveler A is, for example, a pedestrian or a bicycle driver. The mobile person position detection system detects the position of the mobile person A outside the vehicle carrying the mobile communication terminal 2 based on the communication results of the plurality of in-vehicle communication devices 1 and the mobile communication terminal 2. The in-vehicle communication device 1 is provided with a warning unit 1a that issues a warning by light or voice, and the warning unit 1a issues a warning according to the position of the moving person A to the driver.

  FIG. 2 is a block diagram illustrating a configuration example of the in-vehicle communication device 1. The in-vehicle communication device 1 is, for example, a computer including a control unit 11 such as a CPU (Central Processing Unit) that controls the operation of each component of the in-vehicle communication device 1. A storage unit 12, a communication unit 13, a distance detection unit 14, a position detection unit 15, and an output unit 16 are connected to the control unit 11 via a bus.

The storage unit 12 includes, for example, a nonvolatile memory and a volatile memory. The nonvolatile memory is a ROM such as an EEPROM (Electrically Erasable Programmable ROM). The non-volatile memory executes a control program necessary for the initial operation of the computer and a process for detecting the position of the moving person A and warning the driver of the vehicle C of the presence of the moving person A moving toward the road. Computer program. The volatile memory is a RAM such as a DRAM (Dynamic RAM) and an SRAM (Static RAM), for example, and a control program, a computer program, or a control unit read from the nonvolatile memory when executing the arithmetic processing of the control unit 11 Various data generated by the 11 arithmetic processes are temporarily stored.
The storage unit 12 stores map information 12a indicating the position of the roadway R. The map information 12a is information used for route guidance using a car navigation device, for example. The map information 12a stores information indicating the position of a node corresponding to an intersection, information related to a link connecting each node, and the like. The position of the node is represented by latitude and longitude, for example. The road link is a road section at two adjacent intersections, and logically constitutes a road on which the vehicle C travels. Each road link is connected by a node corresponding to an intersection, and logically constitutes a road network. The position of the vehicle C on the road link is obtained from the positions of the nodes at both ends of the road link.

Note that the storage unit 12 may include devices such as a hard disk drive, a solid state drive, and other disk drives that can read data, and a CD-ROM drive that can read data from a portable recording medium. The computer program is transmitted via a recording medium such as a CD (Compact Disc) -ROM, a DVD (Digital Versatile Disc) -ROM, or a BD (Blu-ray (registered trademark)) which is a portable medium recorded in a computer-readable manner. It is recorded on hard disk drives and solid state drives. An optical disk is an example of a recording medium, and a computer program may be recorded on a flexible disk, a magnetic optical disk, an external hard disk, a semiconductor memory, or the like so as to be readable by a computer. The computer program according to the present embodiment may be downloaded from an external computer (not shown) connected to the communication network.
The control unit 11 causes the computer to function as the in-vehicle communication device 1 by executing the computer program recorded on the recording medium or the computer program stored in the storage unit 12.

  The communication unit 13 is an interface for wirelessly transmitting and receiving various types of information between the mobile communication terminal 2 possessed by the person A outside the vehicle and the other in-vehicle communication device 1. Transmission / reception is controlled by the control unit 11. The communication unit 13 outputs the transmitted / received signal to the distance detection unit 14 as information for detecting the distance between itself and the mobile communication terminal 2 by wireless communication.

  The distance detection unit 14 detects the distance between itself and the mobile communication terminal 2 based on the result of wireless communication by the communication unit 13. The distance detection method is not particularly limited. For example, the distance detection unit 14 receives received signal strength indication (RSSI) of a signal transmitted and received between the in-vehicle communication device 1 and the mobile communication terminal 2. ), A time of arrival (TOA) or a time difference of arrival (TDOA), or the like, can be used to estimate the distance.

  As the simplest example, a configuration for detecting a distance using received signal strength will be described. As a signal used for wireless communication, a Bluetooth (registered trademark) standard signal can be used. The distance detection unit 14 includes, for example, a reception signal strength detection unit (not shown). The communication unit 13 of the in-vehicle communication device 1 transmits a signal requesting transmission of a distance detection signal to the mobile communication terminal 2. The mobile communication terminal 2 transmits a signal having a predetermined strength to the in-vehicle communication device 1 in response to the request. The received signal strength detection unit detects the received signal strength of the distance measurement signal transmitted from the mobile communication terminal 2 and received by the communication unit 13. The distance detection unit 14 calculates the distance between itself and the mobile communication terminal 2 based on the magnitude of the reception signal strength detected by the reception signal strength detection unit.

  Note that the distance between the in-vehicle communication device 1 and the mobile communication terminal 2 is calculated based on the received signal strength of the signal transmitted from the in-vehicle communication device 1, not the received signal strength of the signal transmitted from the mobile communication terminal 2. You may comprise so that it may do. Specifically, the in-vehicle communication device 1 transmits a distance detection signal to the mobile communication terminal 2. The distance detection signal has a predetermined intensity. The mobile communication terminal 2 receives the distance detection signal transmitted from the in-vehicle communication device 1 and detects the received signal strength of the received signal. Then, the mobile communication terminal 2 transmits information indicating the detected received signal strength to the in-vehicle communication device 1. The communication unit 13 of the in-vehicle communication device 1 receives the received signal strength information transmitted from the mobile communication device, and the distance detecting unit 14 and the mobile communication device based on the received signal strength level indicated by the information. The distance to the terminal 2 is calculated.

  In addition, when detecting the distance based on the signal arrival time, it is preferable to use ultra wide band (UWB) communication. UWB is a wireless communication system that performs transmission and reception using a wide frequency band of 500 MHz or more. The distance detection unit 14 estimates the distance between the mobile communication terminal 2 and the in-vehicle communication device 1 from the time difference in signal transmission / reception timing.

  The position detection unit 15 detects the position of the vehicle C on which the position detection unit 15 is mounted. The position detection unit 15 is a navigation device, for example. The position detection unit 15 includes, for example, a GPS receiver. The GPS receiver constitutes a GPS system together with GPS satellites, receives radio waves from artificial satellites, and specifies the position of the navigation device itself, that is, the position of the vehicle C. The position of the vehicle C is represented by latitude and longitude, for example. The position detection accuracy of the position detection unit 15 mounted on the vehicle C is higher than the position accuracy that can be detected by the GPS function mounted on the mobile communication terminal 2 such as a general smartphone.

  The warning unit 1 a is connected to the output unit 16. The control unit 11 issues a warning to the driver of the vehicle C by outputting a signal related to the warning to the warning unit 1 a via the output unit 16. The warning unit 1a is a speaker, a light source, a display device or the like, and issues a warning by sound or light.

  FIG. 3 is a block diagram illustrating a configuration example of the mobile communication terminal 2. The mobile communication terminal 2 is, for example, a computer including a terminal control unit 21 such as a CPU that controls the operation of each component of the mobile communication terminal 2, such as a smartphone having a wireless communication function, a portable tablet terminal, or the like. Configure. A terminal storage unit 22, a terminal communication unit 23, a display unit 24, and an audio output unit 25 are connected to the terminal control unit 21 via a bus.

The terminal storage unit 22 includes a nonvolatile memory and a volatile memory, like the storage unit 12 of the in-vehicle communication device 1. The non-volatile memory stores a control program necessary for the initial operation of the computer and a computer program necessary for the position detection process of the mobile person A.
The volatile memory temporarily stores various data generated by the control program, the computer program, or the calculation process of the terminal control unit 21 read from the nonvolatile memory when the calculation process of the terminal control unit 21 is executed.

  The terminal communication unit 23 is an interface for wirelessly transmitting / receiving various information to / from the in-vehicle communication device 1, and transmission / reception of various information by the terminal communication unit 23 is controlled by the terminal control unit 21. The basic configuration of the terminal communication unit 23 is the same as that of the communication unit 13 of the in-vehicle communication device 1.

  The display unit 24 is a liquid crystal panel or an organic EL display. The display unit 24 is provided with an operation panel having a touch sensor or the like. The display unit 24 can display an operation screen and other images, and the operation panel can accept input to the operation screen displayed on the display unit 24.

  The audio output unit 25 is a speaker. The terminal control unit 21 gives audio data to the audio output unit 25 to output audio related to the audio data.

  FIG. 4 is a flowchart showing the procedure for detecting the position of the moving person and warning. The control part 11 of one vehicle-mounted communication apparatus 1 performs the process which shares the information regarding the distance of the moving person A with respect to each vehicle C, and the position of each vehicle C between other vehicle-mounted communication apparatuses 1 ( Step S11).

  FIG. 5 is a flowchart illustrating a procedure for sharing the terminal distance information and the vehicle position information. Here, an example in which information is shared between two vehicles will be described. The two in-vehicle communication devices 1 and 1 that execute the information sharing process are referred to as a first in-vehicle communication device 1 and a second in-vehicle communication device 1, respectively. The same applies to the processing when information is shared among three or more vehicles.

  The distance detection unit 14 of the first in-vehicle communication device 1 detects the distance between itself and the mobile communication terminal 2 by wireless communication performed with the mobile communication terminal 2 (step S31).

  And the position detection part 15 of the 1st vehicle-mounted communication apparatus 1 detects the position of the own vehicle C, ie, the position of the vehicle C in which this vehicle-mounted communication apparatus 1 is mounted (step S32).

  Next, the control unit 11 causes the storage unit 12 to store terminal distance information indicating the distance detected in step S31 and vehicle position information indicating the position of the vehicle C detected in step S32 (step S33).

  Next, the control unit 11 transmits the terminal distance information indicating the distance detected in step S31 and the vehicle position information indicating the position of the vehicle C detected in step S32 to the other in-vehicle communication device 1 using the communication unit 13. (Step S34).

  The second in-vehicle communication device 1 receives the terminal distance information and the vehicle position information transmitted from the first in-vehicle communication device 1 at the communication unit 13 (step S35). And the terminal distance information and vehicle position information of other vehicle C which were received are memorize | stored in the memory | storage part 12 (step S36). The terminal distance information is information indicating the distance between the other in-vehicle communication device 1 and the mobile communication terminal 2, and the vehicle position information is information indicating the position of the vehicle C on which the other in-vehicle communication device 1 is mounted. .

  The distance detection unit 14 of the second in-vehicle communication device 1 detects the distance to the mobile communication terminal 2 by wireless communication performed with the mobile communication terminal 2 (step S37).

  And the position detection part 15 of the 2nd vehicle-mounted communication apparatus 1 detects the position of the own vehicle C, ie, the position of the vehicle C in which this vehicle-mounted communication apparatus 1 is mounted (step S38).

  Next, the control unit 11 causes the storage unit 12 to store terminal distance information indicating the distance detected in step S37 and vehicle position information indicating the position of the vehicle C detected in step S38 (step S39).

  Next, the control unit 11 transmits the terminal distance information indicating the distance detected in step S37 and the vehicle position information indicating the position of the vehicle C detected in step S38 to the other in-vehicle communication device 1 using the communication unit 13. (Step S40).

  The first in-vehicle communication device 1 receives the terminal distance information and the vehicle position information transmitted from the second in-vehicle communication device 1 at the communication unit 13 (step S41). And the terminal distance information and vehicle position information of other vehicle C which were received are memorize | stored in the memory | storage part 12 (step S42).

  Through the above processing, the first and second in-vehicle communication devices 1 can exchange and share terminal distance information and vehicle position information. A plurality of in-vehicle communication devices 1 can share terminal distance information and vehicle position information with each other by executing similar processing with other in-vehicle communication devices 1.

  Returning to FIG. 4, the control unit 11 specifies the position of the moving person A (step S <b> 12), and stores position information indicating the specified position of the moving person A in the storage unit 12 (step S <b> 13). Specifically, the control unit 11 includes the distance detected by the distance detection unit 14, the position detected by the position detection unit 15, the distance indicated by the terminal distance information and the vehicle position information received by the communication unit 13, and The position of the mobile communication terminal 2 is specified based on the position. Since the positions of the plurality of vehicles C are known, the position of the mobile communication terminal 2 is uniquely determined as a position where the distance between the mobile person A communication device and each vehicle C matches. The position of the mobile communication terminal 2 is represented by latitude and longitude, for example. The position of the mobile communication terminal 2 specified in step S12 is a position on a two-dimensional plane including the surface of the roadway R, for example. If there is only information on the two in-vehicle communication devices 1, the position of the mobile communication terminal 2 is not uniquely determined, but the candidate position where the mobile communication terminal 2 may exist is determined. The following warning process may be executed using the candidate position.

  And the control part 11 determines whether the distance of the position specified by step S12 and the position which the position detection part 15 detected is less than predetermined distance (step S14). The predetermined distance is a value stored in advance in the storage unit 12.

  When it is determined that the distance is less than the predetermined distance (step S14: YES), the control unit 11 determines that the position of the mobile communication terminal 2 specified in step S12 is directed toward the road R based on the map information 12a stored in the storage unit 12. It is determined whether or not it has moved (step S15). The control unit 11 determines that the mobile communication terminal 2 is moving toward the road R when the distance between the position of the mobile communication terminal 2 and the position of the road R indicated by the map information 12a is shortened.

  When it is determined that the mobile communication terminal 2 is moving toward the roadway R (step S15: YES), the control unit 11 outputs a warning that the mobile person A is moving toward the roadway R. (Step S16).

  When step S16 is completed, when it is determined in step S14 that the distance is equal to or greater than the predetermined distance (step S14: NO), when it is determined in step S15 that the mobile communication terminal 2 is not moving toward the roadway R ( Step S15: NO), the control unit 11 determines whether or not to stop the pedestrian tracking process (step S17). When it determines with stopping (step S17: YES), the control part 11 finishes a process. When it determines with not stopping (step S17: NO), the control part 11 returns a process to step S11. By repeatedly executing the processes of step S11 and step S12, the position of the mobile communication terminal 2 is repeatedly specified.

  According to the mobile position detection system and the vehicle-mounted communication device 1 configured as described above, the position of the mobile person A can be determined with higher accuracy than the GPS mounted on the mobile communication terminal 2 regardless of the presence of an obstacle. Can be detected.

  Moreover, the vehicle-mounted communication apparatus 1 determines whether the mobile person A is moving toward the roadway R by repeatedly specifying the position of the mobile communication terminal 2, and the mobile person A moves to the roadway R. A warning can be issued to the driver when Therefore, it is possible to warn the driver of the vehicle C in advance that there is a risk of collision between the vehicle C and the driver.

  Furthermore, the in-vehicle communication device 1 can issue a warning to the driver when the distance from the mobile communication terminal 2 device is less than a predetermined distance. Therefore, it is possible to prevent an unnecessary warning from being output when there is no risk of collision with the person A. Further, since the warning is issued only when there is a risk of collision with the moving person A, the driver of the vehicle C can be more strongly warned of the existence of the moving person A.

(Modification)
In the above description, the example in which the position of the mobile A communication terminal is specified two-dimensionally in step S12 has been described, but the position of the mobile communication terminal 2 may be specified three-dimensionally. That is, the control unit 11 specifies the position of the mobile communication terminal 2 as a three-dimensional position including height information with respect to a plane including the positions of three or more in-vehicle communication devices 1 in step S12. The method for specifying the position of the mobile communication terminal 2 is the same as that in the first embodiment. Since the positions of the plurality of vehicles C are known, the position of the mobile communication terminal 2 is uniquely determined as a position where the distance between the mobile person A communication device and each vehicle C matches. The position of the mobile communication terminal 2 is represented by, for example, latitude, longitude, and height.

According to the modification, the in-vehicle communication device 1 can discriminate between the mobile person A who is actually moving toward the roadway R and the mobile person A who is moving on the pedestrian bridge intersecting the roadway R. For example, when the distance in the vertical direction of the mobile communication terminal 2 with respect to the surface of the roadway R is less than a predetermined threshold value and the conditions of Step S14 and Step S15 are satisfied, the control unit 11 uses the warning unit 1a. Issue a warning. Conversely, when the vertical distance of the mobile communication terminal 2 relative to the surface of the roadway R is equal to or greater than a predetermined threshold, the warning unit 1a does not issue a warning.
Thus, only when there is a possibility that the traveler A actually enters the roadway R, a warning can be issued to the driver, and the driver of the vehicle C can be more strongly warned of the presence of the traveler A. it can. Further, it is possible to prevent an unnecessary warning from being output when there is no risk of collision with the person A.

(Embodiment 2)
Since the configuration of the mobile communication terminal 202 and the processing procedure of the in-vehicle communication device 1 are different from those of the first embodiment in the mobile position detection system according to the second embodiment, the differences will be mainly described below.

  FIG. 6 is a block diagram showing a configuration example of the mobile communication terminal 202 according to the second embodiment of the present invention. The mobile communication terminal 202 according to the second embodiment includes a speed detection unit 226 in addition to the same configuration as that of the first embodiment. The speed detection unit 226 is a circuit that detects the speed of the mobile communication terminal 202. The speed detection unit 226 includes, for example, a GPS receiver and an acceleration sensor. The speed detection unit 226 specifies its approximate position using a GPS receiver. Note that the position detection accuracy of the mobile communication terminal 202 by the GPS receiver is lower than the position detection accuracy of the position detection unit 15 provided in the vehicle C. The speed detection unit 226 estimates the presence or absence of movement or the speed based on the detection result of the acceleration sensor. The speed detection unit 226 estimates the moving direction and speed of the moving person A from the detected change in position. The terminal control unit 21 transmits speed information indicating the speed detected by the speed detection unit 226 to the in-vehicle communication device 1 through the terminal communication unit 23. The speed information includes the direction.

  FIG. 7 is a flowchart showing a procedure for detecting and warning the position of a moving person according to the second embodiment of the present invention. As in the first embodiment, the control unit 11 of one in-vehicle communication device 1 shares information regarding the distance of the person A to each vehicle C and the position of each vehicle C with a plurality of other in-vehicle communication devices 1. The process which performs is performed (step S211). And the control part 11 transmits the request information for requesting | requiring speed information to the mobile communication terminal 202 in the communication part 13 (step S212).

  When the terminal control unit 21 of the mobile communication terminal 202 receives the request information, the speed detection unit 226 detects the speed of the mobile communication terminal 202 (step S213), and the speed information indicating the detected speed is transmitted to the terminal communication unit 23. To the in-vehicle communication device 1 as the request source (step S214).

  The control part 11 of the vehicle-mounted communication apparatus 1 receives the speed information transmitted from the mobile person A communication terminal by the communication part 13 (step S215). Next, the control unit 11 specifies the position of the moving person A (step S216) as in steps S12 to S13 of the first embodiment, and stores the specified position information of the moving person A in the storage unit 12 (step S217). . Next, the control unit 11 determines whether or not the distance between the position specified in step S216 and the position detected by the position detection unit 15 is less than a predetermined distance (step S218).

  When it is determined that the distance is less than the predetermined distance (step S218: YES), the control unit 11 stores the map information 12a stored in the storage unit 12, the position of the mobile communication terminal 202 specified in step S216, and the speed information received in step S215. Whether or not the mobile communication terminal 202 is moving toward the roadway R is determined based on the speed indicated by (step S219).

  When it is determined that the mobile communication terminal 202 is moving toward the roadway R (step S219: YES), the control unit 11 outputs a warning that the mobile person A is moving toward the roadway R. (Step S220).

  When the process of step S220 is completed, when it is determined in step S218 that the distance is equal to or greater than the predetermined distance (step S218: NO), when it is determined in step S219 that the mobile communication terminal 202 is not moving toward the roadway R ( Step S219: NO), the control unit 11 executes the same process as Step S17 of the first embodiment, ends the process depending on the situation, or returns the process to Step S211.

  According to the second embodiment, based on the speed of the moving person A detected by the mobile communication terminal 202 and the map information 12a, it is determined whether or not the moving person A is moving toward the roadway R, and the movement A warning can be issued to the driver when the person A is moving to the roadway R. Therefore, it is possible to warn the driver of the vehicle C in advance that there is a risk of collision between the vehicle C and the driver.

(Embodiment 3)
The moving person position detection system according to the third embodiment is different from the first embodiment in that the roadside communication device 303 is provided and the position of the in-vehicle communication device 1 is corrected by road-to-vehicle communication. Below, this difference is demonstrated.

  FIG. 8 is a conceptual diagram showing a configuration example of a moving person position detection system according to the third embodiment of the present invention. The mobile position detection system according to the third embodiment includes a roadside communication device 303 in addition to the plurality of in-vehicle communication devices 1 and mobile communication terminals 2 similar to those in the first embodiment. The roadside communication device 303 is provided at an appropriate location along the roadway R, and is a device capable of performing road-to-vehicle communication with the in-vehicle communication device 1. The position of the roadside communication device 303 is fixed.

FIG. 9 is a block diagram illustrating a configuration example of the roadside communication device 303. The roadside communication device 303 includes a roadside control unit 311, a roadside storage unit 312, and a roadside communication unit 313 connected via a bus.
The roadside storage unit 312 is hardware similar to the storage unit 12 of the in-vehicle communication device 1 and stores various programs necessary for the function of the roadside communication device 303. In particular, the roadside storage unit 312 stores position information indicating a position where the roadside communication device 303 is installed, for example, latitude and longitude. The position information stored in the roadside storage unit 312 is information on a position specified with higher accuracy than information obtained by GPS.
The roadside communication unit 313 is an interface for wirelessly transmitting and receiving various types of information to and from the plurality of in-vehicle communication devices 1, and transmission and reception of various types of information by the roadside communication unit 313 is controlled by the roadside control unit 311. For example, the roadside communication unit 313 transmits position information indicating the position of the roadside communication device 303 in response to a request from the in-vehicle communication device 1.

  FIG. 10 is a flowchart showing the procedure of the vehicle position correction process. When the control unit 11 of the in-vehicle communication device 1 detects its own position, it can correct the position detected by the position detection unit 15 to a more accurate position by executing the following processing. Specifically, the control unit 11 executes the following process as the process executed in step S32 or step S38.

  The control unit 11 of the in-vehicle communication device 1 detects the position of the vehicle C on which the in-vehicle communication device 1 is mounted by the position detection unit 15 (step S351).

  And the distance detection part 14 of the vehicle-mounted communication apparatus 1 detects the distance of self and the roadside communication apparatus 303 by the wireless communication performed between the roadside communication apparatuses 303 (step S352).

  Next, the control unit 11 transmits request information for requesting position information to the roadside communication device 303 by the communication unit 13 (step S353).

  When receiving the request information, the roadside control unit 311 of the roadside communication device 303 reads the position information of the roadside communication device 303 from the roadside storage unit 312 (step S354), and transmits the read position information to the in-vehicle communication device 1 ( Step S355).

  The control unit 11 of the in-vehicle communication device 1 receives the position information transmitted from the roadside communication device 303 by the communication unit 13 (step S356). And the control part 11 is based on the distance with the roadside communication apparatus 303 detected by the distance detection part 14, and the position of the roadside communication apparatus 303 which the positional information received by the communication part 13 shows. The position detected by the camera is corrected (step S357). For example, when the distance between the position detected by the position detection unit 15 and the roadside communication device 303 is different from the distance detected by the distance detection unit 14, the control unit 11 causes the in-vehicle communication device to match each distance. The position of 1 is corrected. More specifically, the correction may be performed so that the difference between the corrected position and the uncorrected position is minimized.

  According to the mobile position detection system and the vehicle-mounted communication device 1 according to the third embodiment, the vehicle-mounted communication device 1 uses the distance detected by the road-to-vehicle distance detection unit 14 and the position detected by the position detection unit 15 and the position. It can correct | amend based on the position of the roadside communication apparatus 303 which the positional information received in the information receiving part shows. Therefore, more accurate position information of the vehicle C can be obtained, and the position accuracy of the mobile communication terminal 2 specified by the specifying unit is also improved. Therefore, the in-vehicle communication device 1 can more accurately identify the positional relationship between the vehicle C and the vehicle A, and can more accurately warn of the danger of a collision between the vehicle A and the vehicle C. it can.

DESCRIPTION OF SYMBOLS 1 In-vehicle communication apparatus 1a Warning part 2,202 Mobile communication terminal 11 Control part 12 Storage part 12a Map information 13 Communication part 14 Distance detection part 15 Position detection part 16 Output part 21 Terminal control part 22 Terminal storage part 23 Terminal communication part 24 Display Unit 25 voice output unit 226 speed detection unit 303 roadside communication device 311 roadside control unit 312 roadside storage unit 313 roadside communication unit A moving person C vehicle R roadway

Claims (7)

A plurality of in-vehicle communication devices that perform vehicle-to-vehicle communication and a mobile communication terminal that performs wireless communication with the plurality of in-vehicle communication devices, and possess the mobile communication terminal based on communication results of the in-vehicle communication device and the mobile communication terminal A position detection system for detecting a position of a person moving outside the vehicle,
The in-vehicle communication device is
A distance detection unit for detecting a distance between the mobile communication terminal and the mobile communication terminal by wireless communication;
A position detector that detects the position of the vehicle on which the vehicle is mounted;
A transmission unit that transmits distance information indicating the distance detected by the distance detection unit, and position information indicating the position of the vehicle detected by the position detection unit to the other in-vehicle communication device;
A receiving unit for receiving distance information indicating a distance between the other in-vehicle communication device and the mobile communication terminal and position information indicating a position of a vehicle on which the other in-vehicle communication device is mounted;
The position of the mobile communication terminal based on the distance detected by the distance detector, the position detected by the position detector, the distance indicated by the distance information received by the receiver, and the position indicated by the position information A mover position detection system comprising: a specifying unit that specifies The specifying unit repeatedly specifies the position of the mobile communication terminal;
Furthermore, a storage unit for storing map information indicating the position of the roadway,
A determination unit that determines whether or not the position of the mobile communication terminal specified by the specifying unit is moving to a roadway based on map information stored in the storage unit;
The mover position detection system according to claim 1, further comprising: an output unit that outputs a warning when the determination unit determines that the vehicle is moving to the roadway. The mobile communication terminal is
A speed detection unit that detects the speed at which the user moves;
A speed information transmitting unit that transmits speed information indicating the speed detected by the speed detecting unit;
The in-vehicle communication device is
A speed information receiving unit for receiving speed information transmitted from the mobile communication terminal;
A storage unit for storing map information indicating the position of the roadway;
Whether the position of the mobile communication terminal specified by the specifying unit is moving to the roadway based on the map information stored in the storage unit and the speed indicated by the speed information received by the speed information receiving unit. A determination unit for determining;
The mover position detection system according to claim 1, further comprising: an output unit that outputs a warning when the determination unit determines that the vehicle is moving to the roadway. The output unit is
The moving person position detection system according to claim 2 or 3, wherein a warning is output when a distance between the position specified by the specifying unit and the position detected by the position detection unit is less than a predetermined distance. The position of the mobile communication terminal specified by the specifying unit is:
It is a three-dimensional position containing the height with respect to the plane containing the position of three or more said vehicle-mounted communication apparatuses, The mobile person position detection system as described in any one of Claims 1-4. It is installed on the roadside, and includes a roadside communication device that performs road-vehicle communication with the in-vehicle communication device,
The roadside communication device is
A position information transmission unit for transmitting position information indicating its own position;
The in-vehicle communication device is
A road-to-vehicle distance detection unit that detects a distance between itself and the roadside communication device by road-to-vehicle communication;
A position information receiving unit that receives position information transmitted from the roadside communication device;
A correction unit that corrects the position detected by the position detection unit based on the distance detected by the road-to-vehicle distance detection unit and the position indicated by the position information received by the position information reception unit. The mobile person position detection system as described in any one of Claims 1-5. An in-vehicle communication device that detects the position of a mobile communication terminal carried by a person outside the vehicle,
A distance detection unit for detecting a distance between the mobile communication terminal and the mobile communication terminal by wireless communication;
A position detector that detects the position of the vehicle on which the vehicle is mounted;
A transmission unit for transmitting distance information indicating the distance detected by the distance detection unit, and position information indicating the position of the vehicle detected by the position detection unit to another in-vehicle communication device;
A receiving unit for receiving distance information indicating a distance between the other in-vehicle communication device and the mobile communication terminal and position information indicating a position of a vehicle on which the other in-vehicle communication device is mounted;
The position of the mobile communication terminal based on the distance detected by the distance detector, the position detected by the position detector, the position indicated by the position information received by the receiver, and the distance indicated by the distance information An in-vehicle communication device comprising: a specifying unit that specifies

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