JP2009038586A - Location authentication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system for guaranteeing correctness of location information of a mobile. <P>SOLUTION: A location authentication system includes a plurality of road-side units and a location information management center 12, and each of the road-side unit 11 transmits identification information for identifying the relevant road-side equipment by means of a function of an identification information transmitting section 15. A vehicle 13 transmits, to the location information management center 12, the identification information received from the proximate road-side unit 11 together with its own location information as mobile information. The location information management center 13 receives the mobile information from the vehicle 13 by means of a function of a mobile information receiving section 17. Furthermore, the location information management center 13 stores information about locations in which the plurality of road-side units are installed, in a storage section 16. The location information management center 13 then specifies a location in which the proximate road-side unit 11 is installed, by means of a function of an install location specifying section 18. When the install location of the relevant road-side unit is specified, the location information management center 12 determines whether location information is correct, by means of a function of a location information determining section 19. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a position authentication system that authenticates the position of a moving object.

  In recent years, GPS (Global Positioning System) has been widely used as a method for specifying the position of a moving object (automobile, ship, aircraft, person, etc.). GPS is a technique for determining the position of a moving object on a plane by measuring the apparent distance between three or more artificial satellites (GPS satellites) that transmit GPS signals and the moving object (four or more). If a GPS satellite is used, the position in the height direction can also be measured).

  On the other hand, a service that manages and provides position information of a plurality of moving bodies by using a technique for specifying positions such as GPS is considered. Such a service is, for example, a service for notifying vehicle congestion information, bus operation status, and the like.

  An example of the flow of such service processing will be described. First, the center for managing the position of the mobile body (vehicle) requests the vehicle to transmit the position information. The vehicle transmits its position information to the center in response to a request from the center. The center receives and manages position information transmitted from the vehicle, and provides it to service users.

  However, in the above procedure (prior art), the correctness of the position information received from the vehicle cannot be guaranteed, so if the vehicle does not accurately transmit its own position information to the center, the accurate position information is managed.・ Cannot be provided. Therefore, a technique for ensuring the validity of such position information (position information of the moving body) (a technique for determining whether the position information is valid) is desired.

In addition, there exist patent document 1-patent document 3 as a prior art which utilized GPS for the digital camera. Further, Patent Documents 4 to 6 are known as conventional techniques related to a location information management method using GPS.
JP 2001-33537 A JP-A-2005-45486 JP 2005-286687 A JP-A-11-55741 JP 2003-223449 A JP 2006-287327 A

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a system for assuring the validity of the position information of a moving object.

  In order to achieve the above object, the present invention adopts the following configuration.

The position authentication system according to the present invention is a mobile body position authentication system including a plurality of fixed bodies and a position information management center, and the fixed body includes identification information for identifying the fixed body. It has identification information transmitting means for transmitting to a predetermined range based on the installation position of the body, and the mobile body manages the positional information as the mobile body information with the identification information received from the adjacent fixed body together with its own position information. A position information management center, storage means for storing information on the installation positions of each of the plurality of fixed bodies, mobile body information receiving means for receiving the mobile body information from a mobile body, An installation position specifying means for specifying an installation position of the adjacent fixed body by referring to the storage means based on the identification information received by the mobile body information receiving means, and the mobile body information reception Position information determination means for determining whether or not the position information of the mobile body is valid by comparing the position information of the mobile body received at the stage with the information on the installation position of the fixed body specified by the installation position specifying means It is characterized by having.

  In the position authentication system according to the present invention, the position information management center compares the position information of the mobile body with the information on the installation position of the fixed body specified by the installation position specifying means, so that the position information of the mobile body is valid. It is determined whether or not. The installation position of the fixed body is specified by referring to the storage means based on the identification information received by the mobile body information receiving means. The fixed body transmits the identification information only within a predetermined range based on the installation position of the fixed body, and the moving body cannot receive the identification information from the fixed body unless it is within the range. Therefore, the fact that the mobile object has received the identification information and that the position information of the mobile object is within the transmission range of the identification information is evidence that the position information of the mobile object is valid. . Thereby, the correctness of the positional information of a mobile body can be ensured.

  The identification information includes information on the installation position of the stationary body itself, and the installation position specifying means includes information on the installation position specified based on the identification information received by the mobile body information receiving means, and the identification information. It is preferable to determine whether or not the identification information itself is valid by comparing the information on the included installation position. When the identification information of the fixed body included in the moving body information is valid, the possibility that the position information of the moving body is valid is high. That is, the result that the identification information is valid is evidence that the position information of the mobile object is valid. Thereby, the correctness of the positional information of a mobile body can be ensured.

  The identification information also includes time information, and the installation position specifying means includes the time information included in the identification information received by the mobile body information receiving means, and the location information management center when the mobile body information is received. It is preferable to determine whether or not the identification information itself is valid by comparing with the reception time. When the identification information of the fixed body is valid, it is preferable to specify the installation position of the fixed body. Thereby, it is possible to determine that the identification information transmitted in the past is not valid.

  It is preferable that the identification information is encrypted information, and the location information management center includes a decryption unit that decrypts the encrypted identification information. If the identification information is not encrypted, the mobile object or the like can grasp the contents (contents of the identification information). Therefore, a mobile object or the like can deceive the location information management center by diverting the identification information or rewriting (falsifying) the contents of the identification information. Since the identification information is encrypted, the mobile object or the like cannot grasp the contents of the identification information. Therefore, the possibility that the identification information is diverted or altered can be reduced. It is possible to guarantee the validity of the location information.

  Preferably, the identification information is information encrypted with a public key of the location information management center, and the decryption means decrypts the encrypted identification information with a secret key of the location information management center. . As a result, the location information management center can easily manage a key for decryption.

The position information is preferably GPS information. Since GPS is a widely used technique for specifying the position of an object such as a moving object, the position authentication system according to the present invention can be easily constructed.

  In the position authentication system according to the present invention, it is possible to guarantee the validity of the position information of the moving object.

  Exemplary embodiments of the present invention will be described in detail below with reference to the drawings.

<System overview>
FIG. 1 is a diagram showing an overall configuration of a location authentication system according to an embodiment of the present invention. This position authentication system is a system for authenticating the position of a mobile object, and can be used for, for example, a service that provides traffic jam information of a vehicle, a service that provides bus operation status, and the like. In the present embodiment, a case where the moving body is a vehicle will be described. This location authentication system is applicable not only to vehicles but also to location authentication of any device that can calculate (receive) and transmit its own location information, such as a mobile phone with a built-in GPS radio receiver. Can do.

  As shown in FIG. 1, the position authentication system includes a plurality of roadside machines 11 (fixed bodies) and a position information management center 12.

  Each roadside machine 11 is installed near a road or at a predetermined position on the road. And the identification information of itself is transmitted in a comparatively narrow range (for example, several tens of meters to several tens of meters) so that only vehicles in close proximity can receive. The roadside device 11 may be provided in an infrastructure such as a traffic signal, a power pole, a road, or a building, or may be a device installed independently. The identification information is information for identifying the roadside device. The identification information in this embodiment is an identification number of the roadside device.

  First, a rough processing flow of the position authentication system in the present embodiment will be described.

  The position information management center 12 requests position information from the vehicle 13 (step S1). And the vehicle 13 receives identification information from the roadside machine 11 which adjoins (step S2).

  Next, the vehicle 13 receives the radio wave transmitted from the GPS satellite and calculates its own position information (step S3). Then, the position information is transmitted to the position information management center 12 as moving body information together with the identification information received in step S2 (step S4).

  Then, the position information management center 12 specifies the installation position of the roadside device 11 based on the identification information included in the received mobile body information. And when the installation position of the roadside machine 11 and the position of a vehicle are near, it determines with the said positional information being valid.

  When the position information of the vehicle 13 is valid, information including the position information of the vehicle may be provided to a registrant of a service using the system, and the position information is inappropriate. This information should not be included in the information that is managed and provided.

Information communication between the roadside machine 11 and the vehicle 13 is performed by wireless communication. Note that the communication method may be one-way communication when the vehicle 13 only receives information from the roadside device 11 as in the present embodiment. However, the vehicle 13 may request identification information from the roadside unit 11, and in this case, bidirectional communication may be used. Although the roadside machine 11 in this embodiment assumes the case where the identification information is always transmitted, when using bidirectional communication for the information communication between the roadside machine 11 and the vehicle 13, the roadside machine 11 The identification information may be transmitted only when there is a request from the vehicle 13.

  The information communication between the vehicle 13 and the location information management center 12 is performed by, for example, providing a base station between the vehicle 13 and the location information management center 12, and performing wireless communication between the vehicle 13 and the base station. Wired (or wireless) communication may be performed between the base station and the location information management center 12. Note that the communication method may be bidirectional communication when the location information management center 12 requests the vehicle 13 for location information of the vehicle, as in the present embodiment. However, the vehicle 13 may transmit information periodically (or whenever identification information is received from the roadside device 11), and the location information management center may receive and determine the information. May be used.

<Device configuration>
Next, functional configurations of the roadside machine 11 and the location information management center 12 will be described.

<Roadside machine>
The roadside machine 11 has the identification information transmission part 15 shown in FIG.

  The identification information transmission part 15 is a function which transmits identification information. Specifically, the roadside device 11 transmits the identification information to a predetermined range based on the installation position of the roadside device by the function of the identification information transmission unit 15.

  The range in which the roadside device 11 transmits the identification information may be any range, and may be different for each roadside device. For example, in places where many roadside machines cannot be installed (for example, mountain roads), the number of roadside machines to be installed may be reduced and the range for transmitting identification information may be widened.

  The roadside machine 11 may be installed anywhere as long as it meets the purpose. For example, it may be installed along the road at equal intervals, or in places where the traffic volume of the vehicle is high, the interval may be narrowed so that the identification information can be received no matter where the vehicle is. The interval may be widened in places where there is little traffic. Moreover, it is preferable that the roadside machine 11 is installed so that the range which transmits identification information does not overlap the range which transmits the identification information of another roadside machine. Thereby, since the vehicle 13 does not receive identification information from a plurality of roadside devices at the same time, the number of communications and the processing load can be reduced. Furthermore, since the number of installation of the roadside machine 11 can be reduced, cost can be reduced.

  However, if a large number of roadside machines 11 are installed, it may be unavoidable that the range of transmission of identification information between roadside machines is unavoidable (for example, as shown in FIG. In the case of being provided in the traffic light 21, the distance (range of the distance L1 from the traffic light 21) may overlap because the distance between the traffic lights is close at the intersection. In that case, each roadside device (the traffic light 21) should just transmit the information on the installation position of the traffic light 21 separately from the identification information. Thereby, even if the vehicle 13 is in a position where the identification information can be received from the plurality of traffic signals 21, the vehicle 13 receives the information on the installation position from the plurality of traffic signals 21 and selects the closest traffic signal (from the vehicle 13). Thus, it is possible to determine the traffic light 21 that is the reception target of the identification information. Further, even when the vehicle 13 receives the installation position information and the identification information from the plurality of traffic lights 21, by selecting the nearest traffic light 21 (from the vehicle 13), the identification information to be transmitted to the positional information management center 12 is obtained. Can be determined. That is, when the roadside machine 11 transmits information on the installation position, the vehicle 13 can determine one roadside machine 11 (or its identification information).

  In addition, the information on the installation position of the roadside machine may be information calculated by receiving a radio wave transmitted from a GPS satellite (GPS satellite 14 in FIG. 1). It may be information obtained by a specific technique.

<Location Information Management Center>
The location information management center 12 includes a storage unit 16, a moving body information receiving unit 17, an installation location specifying unit 18, and a location information determining unit 19 shown in FIG. In the present embodiment, these functional elements are realized by a computer processing unit executing software (program) and controlling hardware resources such as a hard disk, a memory, and a display as necessary. . However, these functional elements may be configured by a dedicated chip.

  The memory | storage part 16 is a memory | storage device which memorize | stores the information of each installation position of several roadside machine. As the storage device, any specific technique such as a nonvolatile memory or a hard disk may be applied.

  FIG. 3 shows an example of information stored in the storage unit 16 when there are n roadside devices 11. In the example of FIG. 3, information on the installation positions of n roadside units 11 is stored, one for each row. And the line number in which the information of the installation position is memorize | stored respond | corresponds to the identification number of the roadside machine. For example, the installation position information stored in the third row represents the installation position of the roadside machine 11 whose identification number is “3”.

  The mobile body information receiving unit 17 has a function of receiving mobile body information from the vehicle 13.

  The installation position specifying unit 18 has a function of specifying the installation position of the roadside machine 11 that is a transmission source of the identification information received by the vehicle 13. Specifically, the identification method is identified by referring to the storage unit 16 based on the identification information received by the function of the mobile body information reception unit 17 (for example, the identification number of the roadside machine identification information is “3”). In this case, the installation position information stored in the third row of the storage unit 16 is set as the installation position of the roadside machine (see FIG. 3).

  The position information determination unit 19 has a function of determining whether the position information of the vehicle 13 is valid. Specifically, the position information of the vehicle 13 received by the mobile body information receiving unit 17 is determined by comparing the information on the installation position of the roadside machine 11 specified by the installation position specifying unit 18. For example, if it is determined that the distance between the vehicle 13 and the roadside device 11 is within a predetermined range (for example, a range in which the roadside device 11 transmits identification information), it is determined to be valid. Good (Note that the predetermined range is set in advance by the user (administrator)).

<Location authentication function>
The function and processing flow of the position authentication system will be described in detail with reference to the sequence diagram of FIG.

  In the present embodiment, a case where there are five roadside devices 51a to 51e, a vehicle 13, and a position information management center 12 shown in FIG. 5 will be described. In the example of FIG. 5, each of the roadside devices 51 a to 51 e transmits the identification information within the range of the distance L <b> 1 based on the installation position of the roadside device by the function of the identification information transmission unit 15. The identification information can be received only when belonging to the range (however, the identification information that can be received is the identification information of the roadside device installed at the reference position in the range).

  First, the location information management center 12 requests the location information of itself (vehicle 13) from the vehicle 13 (step S11).

When the vehicle 13 receives a request from the location information management center 12 (step S12), the vehicle 13 receives identification information from a roadside device around itself (step S13). In the example of FIG. 5, since the vehicle 13 belongs within the distance L1 from the installation position of the roadside device 51c, the vehicle 13 receives the identification information (the identification number of the roadside device 51c) from the roadside device 51c. When the vehicle 13 is not within the transmission range of the identification information, the vehicle 13 may transmit a message indicating that the identification information cannot be received to the position information management center 12, or a subsequent process until the identification information can be received. You may wait. On the other hand, if there is no response from the vehicle 13, the location information management center 12 may repeat the request until there is a response from the vehicle 13 (such as requesting every predetermined time (for example, every 5 minutes)). You may give up receiving position information from a vehicle.

  Next, the vehicle 13 receives the radio wave transmitted from the GPS satellite and calculates the current position information of itself (step S14).

  And the vehicle 13 transmits the said identification information to the positional information management center 12 as mobile body information with own positional information (step S15). In the example of FIG. 5, the identification information of the roadside device 51 c and the position information of the vehicle 13 when the identification information is received are transmitted to the position information management center 12.

  Next, the position information management center 12 receives the moving body information from the vehicle 13 by the function of the moving body information receiving unit 17 (step S16).

  Then, the position information management center 12 specifies the installation position of the roadside machine by the function of the installation position specifying unit 18 (step S17). In the example of FIG. 5, the installation position of the roadside device 51c is specified.

  Next, the position information management center 12 determines whether or not the position information of the vehicle 13 received in step S16 is valid by the function of the position information determination unit 19 (step S18). In the example of FIG. 5, when the distance between the vehicle 13 and the roadside device 51c is equal to or less than the distance L1, it is determined that “the position information of the vehicle is valid”. Note that the threshold value for determination may not be the transmission range (distance L1) of the identification information. For example, a threshold value that is a distance L2 that is smaller than the distance L1 may be set in advance. (For example, a threshold value is varied according to identification information (identification number)).

  When the position information of the vehicle 13 is valid, the position information management center 12 accepts the position information, and provides information including the position information of the vehicle to a registrant of the service using the system. . If the position information of the vehicle 13 is invalid, it may give up receiving the correct position information from the vehicle, or continue to request the position information from the vehicle until the correct position information is transmitted. May be.

  As described above, in the present embodiment, the position information management center 12 compares the position information of the vehicle 13 with the information on the installation position of the adjacent roadside machine (roadside machine 51c), whereby the position information of the vehicle 13 is obtained. It is determined whether or not is valid. The roadside machine transmits the identification information only to a predetermined range based on the installation position of the roadside machine, and the vehicle cannot receive the identification information unless it falls within the range. For this reason, the vehicle 13 is able to receive the identification information and that the positional relationship between the identification information and itself (the vehicle 13) is valid (for example, the vehicle position information is within the range). It can be used as evidence that the position information of the vehicle 13) is valid. Thereby, the correctness of the position information of the vehicle 13 can be guaranteed.

<Modification 1>
In the first modification, the identification information includes information on the installation position of the roadside machine itself. If the identification information received from the vehicle includes information on the installation position of the roadside machine itself, the position information management center stores information on the installation position of the roadside machine stored in the storage unit 16. It is possible to determine whether or not the identification information is valid. If the identification information is valid, the vehicle position information is likely to be valid, and the result that the identification information is valid is evidence that the vehicle position information is valid.

<Device configuration>
Since the overall configuration of the position authentication system of the first modification is the same as that of FIG.

  However, the installation position specifying unit 18 of the first modification determines whether the identification information received by the mobile body information receiving unit 17 is valid. Specifically, the information on the installation position specified based on the identification information (identification number included in) received by the mobile body information receiving unit 17 is compared with the information on the installation position included in the identification information. Judgment by.

<Location authentication function>
A function and processing flow of the position authentication system of the first modification will be described with reference to the sequence diagram of FIG.

  The processing in steps S101 to S107 is the same as the processing in steps S11 to S17 in FIG.

  Following step S107, the location information management center determines whether or not the identification information received from the vehicle is valid by the function of the installation location specifying unit 18 (step S108). In the example of FIG. 5, it is determined whether or not the installation position information included in the identification information received from the vehicle 13 is the installation position information included in the identification information of the roadside device 51c. In the present embodiment, when the information on the installation position specified in step S107 is the same as the information on the installation position included in the identification information, it is determined that “the identification information is valid”.

  If the identification information is valid, the process can proceed to the next process. If the identification information is unfair, the position information of the vehicle may be unfair, and it may give up receiving legitimate position information (and identification information) from the vehicle, or the legitimate position information (and The position information may be continuously requested from the vehicle until the identification information is transmitted.

  Then, the position information management center determines whether the position information of the vehicle received in step S106 is valid by the function of the position information determination unit 19 (step S109). In the process of step S109, the vehicle position information received in step S106 is compared with the installation position information specified by the installation position specifying unit 18 (installation position information stored in the storage unit 16). It may be determined by comparing with the information on the installation position included in the identification information received in step S106.

  The process after the determination in step S109 is the same as the process after the determination in step S19 of FIG.

  As described above, in the first modification, it is possible to determine whether or not the identification information is valid by including the information on the installation position of the roadside machine itself in the identification information. If the identification information is valid, the vehicle position information is likely to be valid. That is, it is possible to guarantee the validity of the position information of the vehicle by determining whether or not the identification information is valid.

<Modification 2>
In the second modification, the identification information includes time information. The time information included in the identification information is used to determine the validity of the identification information.

  For example, the time when the identification information is transmitted may be used as the time information, and the expiration date of the identification information may be used as the time information. If the transmission time is used as time information, the location information management center determines whether the time information is within a predetermined time from the reception time of the identification information (the time when the location information management center received the mobile unit information). Whether or not the identification information is valid may be determined depending on whether or not the identification information is valid. When the expiration date is used as time information, the location information management center may determine whether the identification information is valid based on whether the reception time of the identification information is within the expiration date. In this embodiment, when the difference between the time information in the identification information and the reception time of the location information management center is within 10 minutes, it is determined that “the identification information is valid”.

  If the time information is not included in the identification information, the location information management center cannot determine when the identification information is. Therefore, when the vehicle transmits the identification information received in the past and the position information of the vehicle when the identification information is received to the position information management center, the position information management center receives the position information received from the vehicle. Regardless of the past position information, the position information is erroneously determined to be valid position information. By including time information in the identification information, it can be determined whether the identification information has been received in the past. The fact that the identification information is not received in the past also provides evidence that the identification information is valid.

<Device configuration>
The overall configuration of the position authentication system of Modification 2 is the same as that of FIG.

  However, the installation position specifying unit 18 of Modification 2 determines whether or not the identification information received from the vehicle is valid, and specifies the installation position of the roadside machine only when the identification information is valid. Specifically, whether or not the identification information is valid is determined by comparing the time information included in the identification information with the reception time at the location information management center (as described above).

<Location authentication function>
A function and processing flow of the position authentication system of the second modification will be described with reference to the sequence diagram of FIG.

  The processing in steps S201 to S206 is the same as the processing in steps S11 to S16 in FIG.

  Following step S206, the location information management center determines whether or not the identification information received from the vehicle is valid by the function of the installation location specifying unit 18 (step S207). Specifically, it is determined whether or not the identification information is valid by comparing the time information included in the identification information received in step S206 with the reception time at the location information management center.

  If the identification information is valid, the process can proceed to the next process. If the identification information is unfair, the position information of the vehicle may be unfair, and it may give up receiving legitimate position information (and identification information) from the vehicle, or the legitimate position information (and The position information may be continuously requested from the vehicle until the identification information is transmitted.

  Then, the position information management center specifies the installation position of the roadside machine by the function of the installation position specifying unit 18 (step S208).

  Next, the position information management center determines whether the position information of the vehicle received in step S206 is valid or not by the function of the position information determination unit 19 (step S209).

  The process after the determination in step S209 is the same as the process after the determination in step S19 of FIG.

  As described above, in Modification 2, it is possible to determine whether or not the identification information is valid because the identification information includes time information. If the identification information is valid, the vehicle position information is likely to be valid. That is, it is possible to guarantee the validity of the position information of the vehicle by determining whether or not the identification information is valid.

<Modification 3>
In Modification 3, the identification information is encrypted. If the identification information is encrypted, the possibility that the content of the identification information is leaked or tampered with can be reduced, and the reliability of the position authentication system is improved. The identification information may be encrypted by a common key encryption such as a block cipher or a stream cipher, or may be encrypted by a public key (RSA encryption, elliptic curve encryption, etc.) of the location information management center. . If it is encrypted with the public key of the location information management center, it cannot be decrypted by anyone other than the administrator (other than the secret key of the location information management center), so the identification information may be leaked or tampered with Will be lower. Furthermore, by encrypting with the public key of the location information management center, the location information management center can easily manage keys for decryption.

<Device configuration>
FIG. 8 is a diagram illustrating an overall configuration of a position authentication system according to the third modification. The location information management center 12 in Modification 3 further includes a decoding unit 81. The other functional elements are the same as those in FIG.

  The decryption unit 81 has a function of decrypting the encrypted identification information.

<Location authentication function>
The function and processing flow of the position authentication system of the third modification will be described with reference to the sequence diagram of FIG.

  The processing in steps S301 to S306 is the same as the processing in steps S11 to S16 in FIG. However, since the identification information is encrypted, the vehicle (which has received the identification information) cannot understand the contents. It is also difficult to falsify the content of the identification information.

  Following step S306, the location information management center decrypts the encrypted identification information by the function of the decryption unit 81 (step S307). However, the location information management center may not be able to decrypt the identification information (for example, when the identification information received from the vehicle has been tampered with). In that case, the identification information (and the position information) is unfair (note that the fact that the identification information can be decoded is evidence that the identification information has not been tampered with). And identification information) may be given up, or the vehicle may continue to request location information until valid location information (and identification information) is transmitted.

  Subsequent steps (steps S308 and S309) are the same as steps S17 and S18 in FIG.

As described above, in the third modification, the roadside device transmits the encrypted identification information, and the location information management center decrypts the identification information. As a result, the contents of the identification information cannot be known and cannot be altered except by the location information management center (for example, the vehicle itself cannot create the identification information (forcibly altered and transmitted to the location information management center). Even if it is, it is determined that the identification information is invalid))). Therefore, it is possible to guarantee the validity of the identification information, and thus it is possible to guarantee the validity of the position information of the vehicle.

  Note that the methods of the plurality of embodiments may be used in combination with each other as much as possible.

  In this embodiment, the roadside device does not describe in detail whether the information to be transmitted is stored in advance or acquired, but either may be used (for example, installation location information and time information are The time information can be obtained by providing the roadside device with a clock function, or can be obtained from an external clock). Any method may be used as long as an identification number, installation position information, time information, and the like can be obtained (or stored).

  In the first modification, when the installation position information specified based on the identification information received by the mobile body information receiving unit 17 matches the installation position information included in the identification information, “the identification It is determined that the information is legitimate ", but the information on the installation positions may not completely match. A manager of the location information management center or the like may set a threshold value in advance, and may determine that “the identification information is valid” if the amount of deviation of the installation location information is less than the threshold value.

  In Modification 3, the encrypted identification information is transmitted from the roadside device. However, the roadside device may not store the encrypted identification information. The roadside device may further be provided with a function of performing encryption processing.

  Note that, in the third modification, when the identification information cannot be decoded, the identification information is invalid. However, the function of the determination process may be provided in the decoding unit 81 or the installation position specifying unit 18. You may be prepared for. The location information management center may include other components that perform the determination process.

  In Modification 1 and Modification 2, the determination process of whether or not the identification information is valid is performed by the function of the installation position specifying unit 18, but the position information management center has other configurations for performing the determination process. An element may be provided.

  In Modifications 1 to 3, it is not necessary to compare the information on the installation position of the roadside machine with the position information of the vehicle. If the roadside machine identification information is valid, the vehicle position information is likely to be valid. Therefore, the determination result of whether the roadside machine identification information is valid may be the result of whether the vehicle position information is valid.

  Note that the information on the installation position of the roadside machine and the position information of the vehicle may be information obtained by any technique. However, the position authentication system of this embodiment can be easily constructed by obtaining such information using a technique widely used for specifying the position of a vehicle such as GPS.

  Note that the processing order shown in FIGS. 4, 6, 7 and 9 may be changed as much as possible.

For example, in this embodiment, the vehicle receives the identification information from the roadside device after receiving the request from the location information management center, but the vehicle may receive the identification information before receiving the request. Good (eg, the process of step S13 in FIG. 4 is performed before the process of step S12). Specifically, the vehicle stores the latest identification information received during traveling in a memory or the like, and the stored identification information together with its own position information in response to a request from the position information management center. What is necessary is just to transmit to a location information management center.

  Further, for example, in this embodiment, the vehicle receives radio waves from GPS satellites after receiving identification information from the roadside machine, and calculates the position information of the vehicle itself. After receiving the request (before receiving the identification information from the roadside machine), the position information of itself may be calculated (eg, the process of step S14 in FIG. 4 is performed before the process of step S13).

FIG. 1 is a diagram showing the overall configuration of the position authentication system. FIG. 2 is a diagram illustrating an example of a roadside device selection method. FIG. 3 is a diagram illustrating an example of information stored in the storage unit 16. FIG. 4 is a sequence diagram showing a processing flow of the position authentication system. FIG. 5 is a diagram illustrating an example of how roadside units, vehicles, and position information management centers are installed. FIG. 6 is a sequence diagram showing the flow of processing of the position authentication system in the first modification. FIG. 7 is a sequence diagram showing a flow of processing of the position authentication system in the second modification. FIG. 8 is a diagram illustrating an overall configuration of the position authentication system in the third modification. FIG. 9 is a sequence diagram showing a flow of processing of the position authentication system in the third modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Roadside machine 12 Position information management center 13 Vehicle 14 GPS satellite 15 Identification information transmission part 16 Storage part 17 Mobile body information reception part 18 Installation position specification part 19 Position information determination part 21 Traffic lights 51a-51e Roadside machine 81 Decoding part

Claims (6)

A mobile body location authentication system comprising a plurality of fixed bodies and a location information management center,
The fixed body is
Having identification information transmitting means for transmitting identification information for identifying the fixed body to a predetermined range based on the installation position of the fixed body;
The moving body
The identification information received from the adjacent fixed body is transmitted to the position information management center as the moving body information together with its own position information,
The location information management center
Storage means for storing information on the installation positions of each of the plurality of fixed bodies;
Mobile object information receiving means for receiving the mobile object information from a mobile object;
An installation position specifying means for specifying an installation position of the adjacent fixed body by referring to the storage means based on the identification information received by the mobile body information receiving means;
By comparing the position information of the mobile body received by the mobile body information receiving means with the information on the installation position of the fixed body specified by the installation position specifying means, it is determined whether the position information of the mobile body is valid. Position information determination means for
A position authentication system comprising: The identification information also includes information on the installation position of the stationary body itself,
The installation position specifying means compares the installation position information specified based on the identification information received by the mobile body information receiving means with the installation position information included in the identification information, thereby identifying the identification information. The position authentication system according to claim 1, wherein it is determined whether or not it is legitimate. The identification information includes time information,
The installation position specifying means compares the time information included in the identification information received by the mobile body information receiving means with the reception time when the position information management center receives the mobile body information, It is determined whether or not the identification information itself is valid, and when the identification information of the fixed body is valid, the installation position of the fixed body is specified. The location authentication system according to item. The identification information is encrypted information,
The position authentication system according to any one of claims 1 to 3, wherein the position information management center includes decryption means for decrypting the encrypted identification information. The identification information is information encrypted with the public key of the location information management center,
5. The location authentication system according to claim 4, wherein the decryption unit decrypts the encrypted identification information with a secret key of the location information management center. The position authentication system according to any one of claims 1 to 5, wherein the position information is GPS information.

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