JP5408044B2 - Fraud detection of electronic equipment - Google Patents

Description

  The present invention relates to an electronic device.

  Conventionally, as security measures and theft measures for electronic devices, it is known that internal information is erased or disabled when fraud is detected for an electronic device.

  For example, in Patent Document 1, in an automatic toll collection system that automatically collects tolls by communication between an on-road device installed on a toll road and an on-vehicle device, fraudulent acts such as unauthorized opening or unauthorized reading of the on-vehicle device. A technique is disclosed in which communication with a roadside device cannot be normally performed when a road is detected. Further, Patent Document 1 discloses a fraud detection means for detecting a fraud upon detecting a physical change.

  In addition, in Patent Document 2, in an in-vehicle device that performs wireless communication with a road device and performs data processing related to fee settlement, theft is caused when the supply of power from the vehicle battery to the on-vehicle device is stopped. A technique for disabling payment-related information that is considered to have occurred and that is stored in the storage means of the vehicle-mounted device is disclosed.

Japanese Patent No. 3409649 JP 2008-204353 A

  However, in the technology for detecting an illegal act by detecting a physical change like the detecting means for the illegal act disclosed in Patent Document 1, the vehicle-mounted device is removed from the installation location so that the detecting means does not work. As long as it is stolen, the in-vehicle device stolen can be used after the theft.

  In addition, in the technology disclosed in Patent Document 2, if another similar battery is prepared and the battery connected to the vehicle-mounted device is changed so that the power supply to the vehicle-mounted device is not interrupted, the theft can be detected. There was a problem that it was easy to avoid and the in-vehicle device stolen could be used after theft.

  The present invention has been made in view of the above-described conventional problems, and an object thereof is to provide an electronic device that can more reliably prevent fraud avoiding means for detecting fraud in the electronic device. There is.

  In the electronic device according to claim 1, the reflection loss that changes in relation to the ratio of the radio wave transmitted from the antenna and the reflected wave of the radio wave is a metal (in the vehicle) that exists in the vicinity of the electronic device that is fixedly installed. Therefore, a unique value is shown in the environment in which the electronic device is installed.

  According to the configuration of claim 1, the reflection loss calculated by the reflection loss calculation unit and previously registered in the reflection loss registration unit is compared with the reflection loss newly calculated by the reflection loss calculation unit at a predetermined timing. By doing so, it is determined whether or not the electronic device is illegal (for example, theft). Therefore, even when an electronic device is stolen and installed in another vehicle, the reflection loss newly calculated by the reflection loss calculation unit at a predetermined timing is compared with the reflection loss registered in the reflection loss registration unit in advance. Therefore, it is possible to determine whether the electronic device is illegal based on the fact that they are different (not coincident).

  After the electronic device is stolen, it is very difficult to prepare the same environment as the arrangement of the metal in the vicinity of the installation place before the theft, so according to the above configuration, the means for detecting fraud in the electronic device was avoided. It becomes possible to prevent fraud more reliably.

  According to the second aspect of the present invention, the reflection composed of each reflection loss calculated based on the transmission power of the radio waves sequentially transmitted from the antenna while sequentially switching the frequencies and the reception powers of the reflected waves of the radio waves. The loss pattern is used for comparison in the fraud determination unit. When comparing patterns consisting of reflection losses for radio waves of multiple types of frequencies, register them in the reflection loss registration unit in advance, compared to a configuration for comparing the reflection losses of radio waves of one type of frequency. It is possible to more accurately determine that a certain reflection loss is different from the reflection loss newly calculated by the reflection loss calculation unit at a predetermined timing. Therefore, according to the above configuration, the fraud determination unit can more accurately determine whether or not the electronic device is fraudulent.

  If an interference wave that overlaps the frequency band of the radio wave used to calculate the reflection loss is transmitted, not only the reflected wave of the radio wave transmitted from the antenna but also this interference wave will be received. The calculation cannot be performed correctly. On the other hand, according to the configuration of claim 3, when the interference wave whose frequency band is overlapped with the frequency band of the radio wave used for calculating the reflection loss is detected, the start of the transmission of the radio wave from the antenna is postponed. If the reflection loss cannot be calculated correctly due to the influence of the influence of the error, it is possible to prevent misjudgment of whether or not the electronic device is fraudulent in the fraud determination unit by not calculating the reflection loss. .

  Further, as modes after the start of transmission of radio waves from the antenna, there are modes as in claims 4 and 5. For example, as described in claim 4, after waiting for the start of transmission of radio waves from the antenna, the interference wave detection unit may start transmission of radio waves from the antenna when no interference wave is detected. .

  Furthermore, since radio waves transmitted from other devices rarely continue to be transmitted steadily, after suspending the start of transmission of radio waves from the antenna as in claim 5, It is good also as an aspect which starts transmission of the electromagnetic wave from an antenna.

  Further, as in claim 6, the fraud determination unit compares the reflection loss calculated by the detection execution unit with the reflection loss registered in the reflection loss registration unit, and calculates the reflection loss calculated by the detection execution unit. When it is not determined that the reflection loss registered in the reflection loss registration unit substantially matches, the electronic device may be determined to be fraudulent. According to this, it is possible to confirm the coincidence with a certain width in consideration of some errors and variations.

  Further, as in claim 7, the number of times that the fraud determination unit has not determined that the reflection loss calculated by the detection execution unit and the reflection loss registered in the reflection loss registration unit substantially match each other is defined. It is good also as an aspect which determines with fraud of an electronic device, when it becomes more than a number.

  Further, as in claim 8, the electronic device may be an in-vehicle device installed in a vehicle.

  In addition, as described in claim 9, when it is detected that the power of the electronic device is turned on, the detection execution unit causes the transmission control unit to transmit a radio wave from the antenna, and the reflection loss calculation unit causes the reflection loss of the radio wave to be transmitted. As a mode in which the fraud determination unit determines whether the electronic device is fraudulent by comparing the reflection loss calculated by the detection execution unit and the reflection loss registered in the reflection loss registration unit. Good.

  In addition, as described in claim 9, when it is detected that the power of the electronic device is turned off, the detection execution unit causes the transmission control unit to transmit a radio wave from the antenna, and the reflection loss calculation unit causes a reflection loss of the radio wave. As a mode in which the fraud determination unit determines whether the electronic device is fraudulent by comparing the reflection loss calculated by the detection execution unit and the reflection loss registered in the reflection loss registration unit. Good.

  Further, as in claim 10, when it is detected that the connection between the electronic device and the vehicle battery is released and power supply cannot be received, the detection execution unit causes the transmission control unit to transmit radio waves from the antenna, The reflection loss calculation unit calculates the reflection loss of the radio wave, and the fraud determination unit compares the reflection loss calculated by the detection execution unit with the reflection loss registered in the reflection loss registration unit. It is good also as an aspect which determines the presence or absence of fraud.

  According to the eleventh aspect of the present invention, when the fraud determination unit determines that the electronic device is fraudulent, the payment information necessary for data processing related to the payment of the charges stored in the payment information storage unit is deleted. As a result, it becomes possible to prevent unauthorized use of the payment information on the theft side of the electronic device.

  Further, as described in claim 12, when the fraud determination unit determines that the electronic device is fraudulent, the reflection loss registered in the reflection loss registration unit may be deleted.

  Further, as described in claim 13, when the reflection loss registered in the reflection loss registration unit is erased and the electronic device is detected to be turned on, the reflection to the reflection loss registration unit is detected. It is good also as an aspect which alert | reports that the re-registration of loss is required.

  Further, as described in claim 14, when the fraud determination unit determines that the electronic device is fraudulent, a notification that the fraud of the electronic device has been detected may be provided.

  According to the configuration of claim 15, the fraud determination unit determines that the reflection losses calculated by the reflection loss calculation unit substantially coincide with each other in a series of processes performed a plurality of times by the detection execution unit. When determining whether the electronic device is fraudulent or not by comparing the reflection loss pattern composed of the reflection loss calculated by the detection execution unit and the reflection loss pattern registered in the reflection loss registration unit. Become. In other words, when the reflection loss (that is, the calculation result) calculated by the reflection loss calculation unit becomes stable and the calculation result becomes reliable, the calculated reflection loss is used to determine whether or not the electronic device is fraudulent. Will do. Therefore, according to the above configuration, it is possible to more accurately determine the presence / absence of fraud in the electronic device.

  According to the sixteenth aspect of the present invention, if an input of a user authentication signal for authenticating that the user is a normal user is accepted and authentication is performed, and an input requesting re-registration is performed, whether or not the electronic device is fraudulent is confirmed. Since the reflection loss can be re-registered in the reflection loss registration unit by canceling the judgment so as not to be temporarily performed, if the authorized user changes the installation location of the electronic device, the fraud determination unit It is possible to change the installation location of the electronic device without erroneous determination.

  Further, according to the seventeenth aspect, the user authentication signal input unit receives the authentication from the IC card storing authentication data for authenticating that the user is a legitimate user attached to the attachment unit for attaching the IC card. It is good also as an aspect which authenticates that it is a regular user by reading data and performing an authentication process.

  Further, as in claim 18, the user authentication signal input unit receives an input of a password for authenticating that the user is an authorized user in an operation input unit that receives an input of a password from the user, and performs an authentication process. It is good also as an aspect which authenticates that it is a regular user.

  According to the nineteenth aspect of the present invention, since the antenna is provided so that the directivity direction is directed to the metal part provided in the vehicle, the unique reflection loss influenced by the metal part is converted into the reflection loss registration unit. Thus, the fraud determination unit can more accurately determine whether the electronic device is fraudulent.

  When the electronic device is directly installed on a metal surface and the antenna directivity direction faces the metal surface, it is difficult to make the reflection loss unique for each vehicle in which the electronic device is installed. On the other hand, according to the configuration of claim 20, in addition to the configuration of claim 19, the electronic device is on a surface (for example, an instrument panel or dashboard of a vehicle) made of at least one of resin and leather of the vehicle. Since the antenna is installed so that the directivity direction faces the installation surface of the electronic device, the electronic device is installed directly on the metal surface, and the antenna directivity direction does not face the metal surface. The uniqueness of the reflection loss for each vehicle in which an electronic device is installed can be easily obtained. As a result, the fraud determination unit can more accurately determine whether the electronic device is fraudulent.

  When the antenna is directed toward the seat of the vehicle, the reflection loss calculated by the reflection loss calculation unit changes depending on the presence or absence of a passenger or the presence of a metal object. Misjudgment of whether or not a device is illegal may occur. On the other hand, according to the structure of claim 21, since the antenna is provided such that the directing direction does not face the seat direction of the vehicle, the reflection loss depends on the presence or absence of a passenger or the presence of a metal object. It is possible to prevent a situation in which the reflection loss calculated by the calculation unit changes, and it is possible to further prevent erroneous determination of whether the electronic device is fraudulent in the fraud determination unit.

  In addition, the reflection loss that changes in relation to the ratio between the radio wave transmitted from the antenna and the reflected wave of the radio wave can be rephrased as the impedance of the antenna. Therefore, it is possible to determine the presence / absence of an electronic device based on a change in the impedance of the antenna in the same manner as the determination of the presence / absence of an electronic device based on a change in reflection loss.

  In this case, according to the electronic device of the twenty-third aspect, since the presence / absence of fraud of the electronic device is determined based on the impedance of the antenna measured by the impedance measuring unit, the fraud of the electronic device is also detected by the above configuration. It is possible to more reliably prevent fraud that avoids the means to do this.

It is a block diagram which shows the schematic structure of the onboard equipment 1 used by ETC as an example. 3 is a block diagram illustrating a schematic configuration of a detection unit 20. FIG. (A) is a graph showing the relationship between the control voltage Vc and the oscillation frequency fo, and (b) is a graph showing the relationship between the power P and the voltage V. (A) is the figure which showed an example of the reflection loss (return loss), (b) is the figure which showed an example of the return loss value. It is a figure which shows an example of the reflection loss value (return loss value) registered into the non-volatile memory. It is a schematic diagram which shows the condition of the circumference | surroundings of the ETC onboard equipment 1 installed in the vehicle as an example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, a case where the present invention is applied to an ETC (registered trademark) vehicle-mounted device mounted on a vehicle such as an automobile will be described as an example. FIG. 1 is a block diagram showing a schematic configuration of an ETC vehicle-mounted device 1 to which the present invention is applied. The ETC vehicle-mounted device 1 shown in FIG. 1 is mounted on a vehicle, and includes a card I / F unit 11, a radio unit 12, an operation unit 13, an audio output unit 14, a display unit 15, a security module 16, an external I / O. The F unit 17 includes a nonvolatile memory 18, a detection antenna 19, a detection unit 20, a main control unit 21, and a power supply unit 22.

  The ETC vehicle-mounted device 1 is connected to the IC card by performing wireless communication with the ETC roadside device installed at the entrance / exit of the toll road with the IC card inserted into the card connector 30 (see FIG. 6). Data processing related to toll payment (hereinafter referred to as payment-related processing) is performed using the stored information. This ETC roadside device is a wireless communication device installed at an ETC gate on a toll road, and it transmits and receives information necessary for payment of tolls on toll roads through communication with the ETC onboard device 1 mounted on the vehicle. I do.

  In addition, this ETC roadside machine is connected to a management center that mainly performs account debiting and transfer of tolls on toll roads using IC cards, and a vehicle type discrimination system that discriminates vehicle types that pass through the ETC gate. To do. In addition, about the payment related process, the process similar to a general ETC onboard equipment shall be performed in the ETC onboard equipment 1. FIG.

  The card I / F unit 11 is provided in a card connector 30 that is an IC card mounting unit. The main control unit 21 reads information (hereinafter referred to as card information) stored in the IC card, or the IC card. Exchanges information when writing usage history information including billing information, time information, and used entrance / exit information.

  The wireless unit 12 includes a wireless antenna 12a, and transmits information such as card ID, used entrance information, and payment information, among the information stored in the IC card according to an instruction from the main control unit 21, to the ETC roadside device. At the same time, information such as usage history information transmitted from the ETC roadside device is received. The payment information referred to here is information necessary for data processing related to payment of charges, and is information such as a user account number and a credit card number, for example. Moreover, in this embodiment, the radio | wireless part 12 shall perform radio | wireless communication between ETC roadside devices by DSRC communication which is a dedicated narrow area | region communication of a 5.8 GHz band, for example.

  The operation unit 13 is, for example, a mechanical switch provided in the apparatus main body of the ETC on-vehicle device 1 and is used to instruct operation of various functions to the main control unit 21 by a switch operation. Specifically, a usage history repeat button, a volume button, and the like are provided on the front surface of a main body case (not shown), and a signal that operates these is input to the main control unit 21. The operation unit 13 includes a registration button 13a for causing the main control unit 21 to start a waveform registration process and a waveform re-registration process which will be described later. The operation unit 13 may be realized as a touch switch integrated with a display unit 15 described later.

  The audio output unit 14 includes a speaker 31 (see FIG. 6) that outputs audio corresponding to a signal from the main control unit 21. In addition, the display unit 15 can present and notify information to the user, for example, by blinking LEDs. Further, the display unit 15 may be capable of presenting and notifying information to the user by text display or image display by using an LCD (liquid crystal display) or the like. The operation unit 13, the audio output unit 14, and the display unit 15 constitute a human machine interface (HMI) unit.

  The security module 16 encrypts and decrypts information that the main control unit 21 communicates with the ETC roadside device via the wireless unit 12. Further, the security module 16 is based on authentication data such as a card ID of an IC card, for example, in the same manner as the authentication of an IC card (for example, mutual authentication disclosed in Patent Document 2) performed by a well-known ETC on-vehicle device. Authentication is performed as to whether the IC card is a legitimate user (that is, whether the legitimate user).

  The external I / F unit 17 is an interface for exchanging information with an external device other than the ETC vehicle-mounted device 1. For example, the external I / F unit 17 is used for connection with the in-vehicle navigation device when the navigation is linked, such as display or voice output by the in-vehicle navigation device instead of the ETC in-vehicle device 1. In addition, when setting it as the structure which does not make navigation interlock | cooperate, it is also possible to set it as the structure which does not provide the external I / F part 17 in the ETC onboard equipment 1. FIG.

  The nonvolatile memory 18 is configured by, for example, a FLASH ROM or an EEPROM (electronically erasable and programmable read only memory) that can be electrically rewritten, and stores various types of information. The non-volatile memory 18 is connected to the main control unit 21, and various information reading and writing processes are performed according to control from the main control unit 21. In the nonvolatile memory 18, necessary information such as setting information of the ETC on-vehicle device 1, user setting information, and card information read by the card I / F unit 11 is written. The card information includes information necessary for data processing related to the settlement of charges such as vehicle information such as a car registration number, car name, and model, IC card expiration date information, and settlement information. The nonvolatile memory 18 stores a reflection loss (return loss) value (also referred to as VSWR or impedance), which will be described later.

  In the present embodiment, a configuration using an IC card will be described as an example, but the present invention is not limited to this. For example, the same information as the card information may be stored in the non-volatile memory 18 so that a cardless ETC on-vehicle device that does not use an IC card may be used. In this case, it is not necessary to provide the card I / F unit 11 and the card connector 30 in the ETC vehicle-mounted device 1.

  In addition, in the configuration of the cardless ETC on-board device that does not use the IC card, the payment information is stored in the nonvolatile memory 18, but even in the configuration that uses the IC card, the data processing related to the payment of charges It is good also as a structure which memorize | stores payment information in the non-volatile memory 18 for using for. Below, as an example, even if it is the structure which uses an IC card, description is continued as what memorize | stores payment information in the non-volatile memory 18. FIG. Therefore, the nonvolatile memory 18 corresponds to the settlement information storage unit in the claims.

  The detection antenna 19 transmits the radio wave internally oscillated by the detection unit 20 to the outside of the ETC on-board unit 1 as a transmission wave, and the transmission wave that is returned under the influence of a metal object around the ETC on-board unit 1. Receive the reflected wave. Hereinafter, the reflected wave received by the detection antenna 19 is referred to as a received wave. In the present embodiment, it is assumed that the detection antenna 19 transmits a weak radio wave having a frequency band of 2.8 GHz to 3.2 GHz, for example. Therefore, the detection antenna 19 corresponds to the antenna of the claims.

  The detection unit 20 internally oscillates so that a radio wave having a frequency corresponding to the value of the frequency division number input from the main control unit 21 is transmitted from the detection antenna 19. In the example of the present embodiment, radio waves of 2.8 GHz to 3.2 GHz are detected every 10 MHz according to the value of the dividing number of 280 to 320 that are sequentially input while switching from the main control unit 21 point by point. Internal oscillation is performed so as to transmit from the antenna 19 for use.

  The detection unit 20 takes out a detection voltage of the traveling power (that is, transmission power of the transmission wave) with a detector and outputs the detection voltage to the main control unit 21 and also detects a detection voltage of the reflected power (that is, reception power of the reflected wave). Is extracted by a detector and output to the main control unit 21.

  Here, a schematic configuration of the detection unit 20 will be described with reference to FIG. FIG. 2 is a block diagram illustrating a schematic configuration of the detection unit 20. As shown in FIG. 2, the detection unit 20 includes a PLL unit 41, a directional coupler 46, and detectors 47a and 47b. The PLL unit 41 includes a phase comparator 42, a program frequency divider 43, a low pass filter (LPF) 44, and a voltage controlled oscillator (VCO) 45.

  When the frequency division value is input from the main control unit 21 to the PLL unit 41, the phase comparator 42 uses the reference signal (in this example, 10 MHz) f1 and the output f2 of the program frequency divider 43. A voltage output corresponding to the input value of the frequency division number is obtained. The voltage output obtained by the phase comparator 42 is flattened by the LPF 44 to obtain the control voltage Vc. Further, the value of the frequency division number is sequentially switched from the main control unit 21 and input to the PLL unit 41, and the value of the obtained control voltage Vc is also gradually increased as the value of the frequency division number increases.

  Subsequently, the VCO 45 outputs an oscillation frequency fo corresponding to the control voltage Vc input from the LPF 44. Specifically, as shown in FIG. 3A, the higher the control voltage Vc (unit is V), the higher the oscillation frequency fo (unit is GHz). In this example, oscillation frequencies fo of 2.8 GHz to 3.2 GHz every 10 MHz are sequentially output. FIG. 3A is a graph showing the relationship between the control voltage Vc and the oscillation frequency fo. In addition, the vertical axis of FIG. 3A represents the oscillation frequency fo, and the horizontal axis represents the control voltage Vc.

  The radio wave of the oscillation frequency fo passes through the directional coupler 46 and is sequentially output as a transmission wave from the detection antenna 19 every 10 MHz, and also passes in the direction of Fwd (traveling power), thereby detecting the detector 47a. Are sequentially input. The reflected wave of the transmission wave received by the detection antenna 19 passes through the directional coupler 46 in the direction of Rev (reflected power) and is sequentially input to the detector 47b.

  The detector 47a converts the progressive power Pf that is sequentially input into a voltage Vf corresponding to the progressive power Pf and sequentially outputs it to the main control unit 21, and the detector 47b reflects the reflected power Pr that is sequentially input. It converts into voltage Vr according to electric power Pr, and outputs to the main control part 21 sequentially. Specifically, as shown in FIG. 3B, the higher the power P (unit is dBm), the higher the voltage V (unit is V) is output. FIG. 3B is a graph showing the relationship between the power P and the voltage V. Further, the vertical axis of FIG. 3B represents the voltage V, and the horizontal axis represents the power P.

  The main control unit 21 is configured as a normal microcomputer, and includes a well-known CPU, ROM, RAM, I / O, and a bus line (all not shown) for connecting these configurations. In the ROM, a program for the main control unit 21 to execute various processes is written, and the CPU or the like executes various arithmetic processes according to the program, whereby the main control unit 21 performs a payment-related process and will be described later. Various processes such as a detection process, a return loss calculation process, a waveform registration process, an abnormality determination process, a fraud countermeasure process, a temporary release process, and a waveform re-registration process are executed.

  As described above, in the detection process, the main control unit 21 inputs the value of the frequency division number of 280 to 320 to the PLL unit 41 of the detection unit 20 while switching the frequency division number one point at a time. According to the value, radio waves of 2.8 GHz to 3.2 GHz every 10 MHz are transmitted from the detection antenna 19, and as a result of the transmission, the voltage Vf corresponding to the above-described traveling power Pf output from the detection unit 20 and reflection The input of the voltage Vr according to the electric power Pr is received. Therefore, the main control unit 21 corresponds to the transmission control unit in the claims.

  It should be noted that the radio wave used in a communication device such as a DCM other than the ETC in-vehicle device 1 installed in the vehicle or a mobile phone brought into the vehicle cabin has an external radio wave whose band overlaps the frequency band of the radio wave used for detection processing ( In other words, the frequency band of the radio wave transmitted from the detection antenna 19 is set so as not to overlap with the frequency band of the radio wave used in the communication device or the communication terminal so as to avoid the situation of interference wave). That's fine.

  Further, in the return loss calculation process, the main control unit 21 converts each value of the voltage Vf and the voltage Vr received in the detection process into digital values by an A / D converter (ADC) (not shown). Then, a return loss value is calculated by calculating a difference between the digital value Dr derived from the reflected power Pr and the digital value Df derived from the traveling power Pf.

  Here, the return loss and the return loss value will be described with reference to FIGS. 4 (a) and 4 (b). FIG. 4A shows an example of the return loss, and FIG. 4B shows an example of the return loss value. Moreover, the vertical axis | shaft of Fig.4 (a) represents the electric power of return loss, and the horizontal axis represents the frequency. Further, the vertical axis in FIG. 4B represents the return loss value, and the horizontal axis represents the frequency division number.

  The return loss referred to here is a numerical value related to the degree of attenuation of the reflected wave with respect to the transmission wave from the detection antenna 19 and is represented by the ratio of the traveling power Pf and the reflected power Pr. Further, since the return loss is affected by the metal present in the vicinity, the return loss for the radio wave transmitted from the detection antenna 19 is present in the vicinity of the ETC on-board device 1, for example, a metal housing or wire of an ECU in the vehicle. Under the influence of metal objects such as wiring, a unique value is shown in the environment in which the ETC on-board device 1 is installed.

  Furthermore, in this embodiment, radio waves of 2.8 GHz to 3.2 GHz every 10 MHz are sequentially transmitted from the detection antenna 19, so that return loss can be obtained for each frequency. However, as shown in FIG. A waveform composed of return loss with respect to frequency (hereinafter referred to as a return loss waveform) is a unique waveform that can be said to be unique in the world.

  Since the return loss value obtained for each frequency division reflects the return loss, as shown in FIG. 4B, the waveform of the return loss also reflects the waveform of the return loss. In the present embodiment, the abnormality determination process described later is performed using the waveform of the return loss value. Further, the return loss value corresponds to the reflection loss in the claims, and the waveform of the return loss value corresponds to the reflection loss pattern in the claims. Further, the main control unit 21 corresponds to a reflection loss calculation unit in claims.

  In the present embodiment, the configuration is shown in which the reflection loss is calculated by calculating the return loss value by calculating the difference between the digital value Dr derived from the reflected power Pr and the digital value Df derived from the traveling power Pf. Not limited to this. For example, as long as the degree of attenuation of the reflected wave with respect to the transmitted wave can be obtained, the reflection loss is calculated by calculating the ratio of the digital value Df derived from the traveling power Pf and the digital value Dr derived from the reflected power Pr. It is good also as a structure and you may use another method.

  In addition, the main control unit 21 performs a waveform registration process triggered by the input of a signal indicating that the registration button 13a has been operated from the registration button 13a. In the waveform registration process, the aforementioned detection process and return loss calculation process are performed, and the return loss value obtained by the return loss calculation process is stored (that is, registered) in the nonvolatile memory 18. Therefore, the nonvolatile memory 18 corresponds to a reflection loss registration unit in the claims.

  For example, the return loss value obtained by the return loss calculation process is registered in the nonvolatile memory 18 in association with the frequency division number (280 to 320 in this example) as shown in FIG. FIG. 5 is a diagram illustrating an example of a return loss value registered in the nonvolatile memory 18. In addition, the waveform registration process is performed, for example, when the ETC on-vehicle device 1 is attached to the vehicle.

  In the waveform registration process, an IC card of a legitimate user is inserted into the card connector 30 and the security module 16 authenticates that the legitimate user is based on the authentication data read by the card I / F unit 11. It is good also as a structure permitted only when performed. In the waveform registration process, an authentication password indicating that the user is a legitimate user is input to the security module 16 via the operation unit 13, and the security module 16 is a legitimate user based on the authentication password. It may be configured to be permitted only when the authentication is performed.

  Here, when the IC card is configured not to use the ETC card storing the payment information, the IC card is configured to use a registration card different from the ETC card storing the authentication data. The authentication data of the registration card may be used for authentication by the security module 16 in the waveform registration process.

  Further, in the abnormality determination process, the main control unit 21 performs the above-described detection process and return loss calculation process at a predetermined timing, and obtains a return loss value at that time. Therefore, the main control unit 21 corresponds to the detection execution unit in the claims. The predetermined timing here can be arbitrarily set. For example, in the case where the ETC vehicle-mounted device 1 is always connected to the vehicle battery (+ B) and the power supply of the ETC vehicle-mounted device 1 is switched on / off by detecting the on / off of the accessory (ACC) switch. The following timing may be adopted.

  For example, the ETC on-board unit 1 may be turned on by detecting the ACC switch being turned on, and the ETC on-board unit 1 may be turned off by detecting the ACC switch off. It is good also as a structure which makes predetermined time the predetermined | prescribed timing. Furthermore, it is good also as a structure which makes it the time when it detects that the connection of the ETC onboard equipment 1 and a vehicle battery was cancelled | released. In addition, when the main control unit 21 detects that the connection between the ETC vehicle-mounted device 1 and the vehicle battery is released, the main control unit 21 may be configured to operate with a backup power source other than the vehicle battery. Moreover, it is good also as a structure which detects that the connection of ETC onboard equipment 1 and a vehicle battery was cancelled | released by monitoring the voltage of a vehicle battery and having detected the extreme change in the voltage. .

  Further, in the abnormality determination process, a waveform of a return loss value (hereinafter referred to as a measurement waveform) obtained by performing the above-described detection process and return loss calculation process at a predetermined timing and registered in advance in the nonvolatile memory 18 by a waveform registration process. A waveform of the return loss value (hereinafter referred to as a registered waveform) is compared to determine whether or not they match each other.

  Note that whether or not they match is determined with a certain amount of width in consideration of not only whether or not the measured waveform and the registered waveform completely match, but also errors and variations. That is, here, when the measured waveform and the registered waveform are substantially the same, it is determined that they are the same. The approximate match is, for example, when there is a difference in the return loss value between the measured waveform and the registered waveform but the waveform pattern matches, or the return loss value for each frequency division number between the measured waveform and the registered waveform. For example, the difference is within a predetermined range.

  Further, in the abnormality determination process, when it is determined that the measured waveform does not match the registered waveform, it is determined that there is an abnormality. Note that the abnormality referred to here indicates fraud (for example, theft) of the ETC vehicle-mounted device 1. That is, when it is determined that the measured waveform matches the registered waveform, it is determined that the ETC on-board device 1 is not incorrect, whereas when it is determined that the measured waveform does not match the registered waveform, It is determined that the ETC on-board device 1 is illegal. Therefore, the main control unit 21 corresponds to the fraud determination unit in the claims.

  Further, in the abnormality determination process, a series of processes from the above-described detection process to return loss calculation process are performed a plurality of times, and if the measured waveform and the registered waveform do not coincide with each other, a prescribed number of times or more (one or more may be used) (The time may be continuous or may be when the total reaches a plurality of times).

  In addition to the environmental change due to the removal of the ETC on-board unit 1, the measurement waveform changes even if there is some change in the metal casing or wire wiring of the ECU inside the vehicle. There is a possibility that it is determined that the waveform does not match the registered waveform. Therefore, when the series of processing from the detection processing described above to the return loss calculation processing is performed a plurality of times and the measurement waveform for the plurality of times is stable, the measurement waveform and the registered waveform are matched using the measurement waveform. What is necessary is just to be the structure which judges whether it is doing.

  Here, the stability of the measured waveform is, for example, when there is a difference in the return loss values between the multiple measured waveforms, but when the waveform patterns match, or when the divided waveforms of the multiple measured waveforms are divided. When the difference of the return loss value for each number is within a predetermined range, it indicates a state in which the measurement waveforms for the plurality of times substantially match. You may use the average value of the return loss value for every frequency division number of the measurement waveforms for multiple times.

  According to this, when the return loss value calculated in the return loss calculation process becomes stable and the return loss value becomes reliable, the presence / absence of fraud in the ETC on-board unit 1 using the calculated return loss value. Therefore, it is possible to more accurately determine whether the ETC on-board device 1 is illegal.

  The main control unit 21 performs fraud countermeasure processing triggered by the determination that there is an abnormality in the abnormality determination processing. In the fraud countermeasure processing, the main control unit 21 deletes the payment information stored in the nonvolatile memory 18 so that the payment information cannot be used illegally on the thief side of the vehicle-mounted device.

  In the fraud countermeasure processing, the main control unit 21 may be configured to make part or all of the functions of the ETC on-vehicle device 1 inoperable. Further, the fraud countermeasure processing may be configured to notify that the fraud of the ETC in-vehicle device 1 has been detected, such as outputting a warning sound from the audio output unit 14 or displaying a warning on the display unit 15. In addition, the audio | voice output part 14 and the display part 15 are equivalent to the 1st alerting | reporting part of a claim.

  Further, the main control unit 21 performs a temporary release process triggered by the authentication that the user is an authorized user. In the temporary release process, the abnormality determination process in the main control unit 21 is temporarily not performed. Therefore, the main control unit 21 corresponds to a release unit in claims. In addition, the temporary release process may be configured to end, for example, when a waveform re-registration process to be described later is completed, or detection that the input process from the user such as re-registration has not been performed for a certain period of time. It may be configured to end with a trigger.

  The authentication of the authorized user is performed by the security module 16 using the authentication data read by the card I / F unit 11 after the IC card of the authorized user is inserted into the card connector 30. It is sufficient to adopt a configuration that is performed when authentication to the effect is performed. In this case as well, when the ETC card storing the payment information is not used as the IC card, a registration card different from the ETC card storing the authentication data is used as the IC card. A configuration may be adopted in which authentication data of the registration card is used for authentication in the security module 16 in the temporary release processing.

  For authenticating that the user is an authorized user, an authentication password indicating that the user is an authorized user is input to the security module 16 via the operation unit 13, and the security module 16 uses the authentication password based on the authentication password. It is good also as a structure performed when authentication to the effect of a regular user is performed. Therefore, the card connector 30 and the operation unit 13 correspond to a user authentication signal input unit in claims.

  Furthermore, the main control unit 21 performs the waveform re-registration process with a signal indicating that the registration button 13a has been operated input from the registration button 13a when the temporary release process is being performed. . In the waveform re-registration process, the above-described detection process and return loss calculation process are performed, and the return loss value obtained by the return loss calculation process is overwritten and stored in the return loss value previously registered in the nonvolatile memory 18 (that is, , Re-register). Therefore, the registration button 13a corresponds to a re-registration request input unit in claims, and the main control unit 21 corresponds to a re-registration unit in claims. Note that the waveform re-registration process is performed, for example, when the position of the mounting location of the ETC vehicle-mounted device 1 is changed.

  According to this, when a legitimate user changes the installation location of the ETC on-board device 1, the installation location of the ETC on-board device 1 is changed without being determined that the ETC on-board device 1 is illegal in the abnormality determination process. Is possible.

  Note that the card I / F unit 11 to the main control unit 21 (excluding the radio antenna 12a, the audio output unit 14, and the detection antenna 19) are mounted on at least one board 32 (see FIG. 6). It is integrated as a plurality of IC packages and modules. The power supply unit 22 converts a voltage supplied from a vehicle battery (not shown) through an ACC switch into a predetermined voltage and supplies the voltage to the card I / F unit 11 to the main control unit 21.

  According to the above configuration, even when the ETC on-vehicle device 1 is stolen and installed in another vehicle, the ETC on-vehicle device 1 is illegally used because the measured waveform and the registered waveform are different (not coincident). It can be determined that there is. Since it is very difficult to prepare the same environment as the arrangement of metal objects in the vicinity of the installation place before the theft after the ETC on-board device 1 is stolen, according to the above configuration, the fraud of the ETC on-board device 1 is detected. It is possible to more reliably prevent fraud that avoids the means to do this.

  In the above-described embodiment, the radio wave used for the detection process is used by a communication device other than the ETC on-board unit 1 mounted on the vehicle or a communication terminal such as a mobile phone brought into the vehicle interior (hereinafter referred to as other device). Although the configuration has been shown in which the detection processing is performed without being affected by the interference wave by setting the frequency band to avoid the frequency band of the received radio wave, it is not necessarily limited thereto. For example, when a radio wave (that is, an interfering wave) transmitted from another device whose frequency band overlaps with the frequency band of the radio wave used for the detection process is detected, and this interfering wave is detected, the radio wave from the detection antenna 19 is detected in the detection process. Alternatively, the start of transmission may be delayed.

  In this case, for example, when the radio wave is not transmitted from the detection antenna 19, the main control unit 21 has received the radio wave that overlaps the frequency band of the radio wave used for the detection process by the detection antenna 19. What is necessary is just to set it as the structure which detects an interference wave. Therefore, the main control unit 21 corresponds to the interference wave detection unit of the claims. Further, the main control unit 21 may be configured to detect whether the radio wave received by the detection antenna 19 is an interference wave by using a frequency detection circuit (not shown) and detect the interference wave. In addition, it is good also as a structure which receives an interference wave with the antenna for interference wave detection provided separately from the antenna 19 for a detection, and the main control part 21 detects an interference wave.

  According to this, when the return loss value cannot be correctly calculated due to the influence of the interference wave, the return loss value is not calculated, so that the ETC in-vehicle device 1 in the abnormality determination unit is not used. It is possible to further prevent misjudgment of the presence or absence of fraud.

  In addition, after the start of transmission of radio waves from the detection antenna 19 is stopped, transmission of radio waves from the detection antenna 19 may be started when the main control unit 21 no longer detects an interference wave. In addition, since radio waves transmitted from other devices rarely continue to be transmitted steadily, when a certain amount of time has passed after the start of transmission of radio waves from the detection antenna 19, A configuration may be adopted in which transmission of radio waves from the antenna 19 is started. It should be noted that the certain time mentioned here can be arbitrarily set.

  In the fraud countermeasure processing, the main control unit 21 may be configured to delete not only the settlement information stored in the nonvolatile memory 18 but also the return loss value registered in advance. In addition, when the return loss value registered in advance is erased and there is no return loss value registered in the nonvolatile memory 18, the return loss value is obtained when the power of the ETC on-vehicle device 1 is turned on. The main control unit 21 may notify the voice output unit 14 and the display unit 15 that the ETC on-vehicle device 1 cannot be used unless the re-registration is performed.

  In the above-described embodiment, the configuration in which it is determined that the ETC in-vehicle device 1 is fraudulent based on the change in the return loss value is shown, but the configuration is not necessarily limited thereto. For example, a configuration in which the ETC on-board device 1 is determined to be invalid based on the stoppage of power supply from the vehicle battery to the ETC on-board device 1 or a physical change in the mounting of the ETC on-board device 1 to the vehicle. It is good also as a structure combined with the structure determined to be fraudulent of the ETC onboard equipment 1 originally. According to this, it becomes possible to more reliably prevent fraud avoiding the means for detecting fraud of the vehicle-mounted device.

  In the above-described embodiment, the configuration in which the payment information is stored in the nonvolatile memory 18 is shown, but the present invention is not necessarily limited thereto. When the IC card is used, it is not always necessary to store the payment information in the nonvolatile memory 18. Further, when the payment information is not stored in the non-volatile memory 18, in the anti-fraud processing, as described above, part or all of the functions of the ETC on-vehicle device 1 are disabled or the ETC on-vehicle device 1 What is necessary is just to set it as the structure which performs fraud countermeasures by alerting | reporting that fraud was detected.

  Subsequently, the installation location of the ETC vehicle-mounted device 1 and the method of providing the detection antenna 19 will be described with reference to FIG. FIG. 6 is a schematic diagram showing a situation around the ETC vehicle-mounted device 1 installed in the vehicle. In addition, A in FIG. 6 has shown the lining of the instrument panel (henceforth an instrument panel). Further, B in FIG. 6 indicates the passenger compartment side, and C indicates the inside of the instrument panel. Further, D in FIG. 6 indicates a metal object such as a metal casing of an ECU inside the vehicle, and E indicates a metal object such as a wire wiring inside the vehicle.

  First, the detection antenna 19, card connector 30, speaker 31, and card I / F unit 11 to main control unit 21 (wireless antenna 12a, audio output unit 14, and detection) are provided inside the housing of the ETC on-vehicle device 1. The board | substrate 32 which mounted the antenna 19 for use is mounted. In addition, a registration button 13 a for causing the main control unit 21 to start waveform registration processing and waveform re-registration processing is provided outside the housing of the ETC on-vehicle device 1. Here, for convenience, illustration of the radio antenna 12a is omitted, but the radio antenna 12a is installed on the upper surface of the instrument panel, for example, separately from the main body of the ETC on-vehicle device 1.

  The main body of the ETC vehicle-mounted device 1 is attached to the lining A of the instrument panel, for example, as shown in FIG. In addition, the main body of the ETC onboard equipment 1 is good also as a structure attached to other places, such as the inner surface of a glove box.

  The detection antenna 19 is a directional antenna provided so that the directivity direction is directed to the metal object D • E (that is, the metal portion provided in the vehicle) inside the instrument panel C. In order to obtain a unique return loss affected by the metal objects D and E, it is possible to more accurately determine whether the ETC on-board unit 1 is fraudulent in the abnormality determination process. It is. In addition, it is preferable that the housing | casing of the ETC onboard equipment 1 consists of resin, for example so that the antenna 19 for a detection can transmit an electromagnetic wave toward the exterior of the ETC onboard equipment 1.

  When the ETC on-vehicle device 1 is directly installed on a metal surface and the direction of the detection antenna 19 is directed to the metal surface, the return loss value of each vehicle on which the ETC on-vehicle device 1 is installed is calculated. Uniqueness is hard to come out. Therefore, when the detection antenna is provided so that the directing direction is directed to the metal object D / E, the main body of the ETC on-vehicle device 1 is installed on a surface made of at least one of resin and leather of the vehicle, and detection is performed. By providing the antenna 19 so that the directing direction of the antenna 19 faces the installation surface of the ETC on-vehicle device 1, the radio wave transmitted from the detection antenna 19 reaches the metal object D / E via resin or leather. Is preferred.

  Further, if the direction of the detection antenna 19 is directed toward the seat of the driver's seat, front passenger seat, rear seat, etc. of the vehicle, return loss calculation processing is performed depending on the presence or absence of a passenger or the presence of a metal object. Since the return loss value to be calculated changes and an erroneous determination of the presence or absence of fraud of the ETC vehicle-mounted device 1 may occur in the abnormality determination process, the detection antenna 19 is provided so that the pointing direction does not face the seat direction of the vehicle. It is preferred that

  As the detection antenna 19, any antenna may be used, but in order to limit the directivity direction to a certain direction as described above, an antenna having a high F / B ratio is preferably used.

  In the above-described embodiment, the configuration in which the detection antenna 19 is provided inside the housing of the ETC on-vehicle device 1 is shown, but the configuration is not necessarily limited thereto. For example, the configuration may be such that the detection antenna 19 is provided outside the housing of the ETC on-vehicle device 1.

  In the above-described embodiment, the configuration in which the present invention is applied to the ETC vehicle-mounted device mounted on the vehicle is shown, but the configuration is not necessarily limited thereto. For example, a configuration in which the present invention is applied to an in-vehicle navigation device or a DCM may be used, or a configuration in which the present invention is applied to another in-vehicle device. Note that the present invention may be applied to various electronic devices that are fixedly installed, such as indoor wall-mounted televisions and wall-mounted clocks, as well as in-vehicle devices.

  Furthermore, in the above-described embodiment, the configuration in which the presence / absence of fraud in the electronic device is determined based on the return loss value of the radio wave transmitted / received by the detection antenna 19 has been described. For example, instead of the return loss value of the radio wave transmitted from the detection antenna 19, it may be configured to determine whether or not the electronic device is unauthorized based on the impedance of the detection antenna 19. In this case, the impedance of the detection antenna 19 may be measured using a known impedance measuring instrument such as an LCR meter, an impedance bridge, a noise bridge, or an antenna analyzer. This impedance measuring device corresponds to the impedance measuring unit in the claims.

  As an example, the impedance of the detection antenna 19 at the installation location is registered in advance in the same manner as in the above-described embodiment using the return loss value when the electronic device is installed, and the registered impedance and the measured impedance substantially coincide with each other. The main control unit 21 may determine whether or not the electronic device is unauthorized by determining whether or not the electronic device is illegal (that is, based on a change in impedance).

  In addition, the main control unit 21 determines whether or not the measured impedance has changed more than a predetermined threshold value (for example, an arbitrary value larger than the error or variation value) (that is, the impedance). The electronic device may be configured to determine whether or not the electronic device is fraudulent.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the technical means disclosed in different embodiments can be appropriately combined. Such embodiments are also included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ETC onboard equipment (electronic device, onboard equipment), 11 Card I / F part, 12 Wireless part, 13 Operation part (Operation input part, User authentication signal input part), 13a Registration button (Re-registration request input part), 14 Audio output unit (first notification unit, second notification unit), 15 display unit (first notification unit, second notification unit), 16 security module (user authentication signal input unit), 17 external I / F unit, 18 nonvolatile Memory (payment information storage unit, reflection loss registration unit), 19 detection antenna (antenna), 20 detection unit, 21 main control unit (transmission control unit, reflection loss calculation unit, detection execution unit, fraud determination unit, release unit) , Re-registration unit, interference wave detection unit, on / off detection unit, connection presence / absence detection unit), 22 power supply unit, 30 card connector (mounting unit, user authentication signal input unit), 31 speaker, 32 substrate, 41 PLL unit, 42 Phase comparator 43 programmed divider, 44 LPF, 45 VCO, 46 directional coupler, 47a · 47b detector

Claims (23)

An electronic device that is fixedly installed,
An antenna for transmitting a radio wave of a predetermined frequency band to the outside of the electronic device and receiving a reflected wave of the transmitted radio wave;
A transmission control unit for transmitting radio waves from the antenna;
A reflection loss calculation unit for calculating a reflection loss of the radio wave based on at least the transmission power of the radio wave transmitted from the antenna and the received power of the reflected wave of the radio wave received by the antenna;
A reflection loss registration unit that registers in advance the reflection loss calculated by the reflection loss calculation unit;
A detection execution unit that causes the transmission control unit to transmit a radio wave from the antenna at a predetermined timing, and the reflection loss calculation unit calculates a reflection loss of the radio wave;
A fraud determination unit that determines whether the electronic device is fraudulent by comparing the reflection loss calculated by the detection execution unit and the reflection loss registered in the reflection loss registration unit; Features electronic equipment. In claim 1,
The transmission control unit sequentially transmits radio waves from the antenna while sequentially switching the frequency of radio waves transmitted from the antenna,
The reflection loss calculation unit calculates each reflection loss of the radio wave based on each transmission power of the radio wave sequentially transmitted from the antenna and each reception power of the reflected wave of the radio wave received by the antenna,
The reflection loss registration unit registers in advance a reflection loss pattern composed of each reflection loss calculated by the reflection loss calculation unit,
The fraud determination unit compares the reflection loss pattern made up of each reflection loss calculated by the detection execution unit with the reflection loss pattern registered in the reflection loss registration unit to determine whether the electronic device is fraudulent. An electronic device characterized by determining presence or absence. In claim 1 or 2,
An interference wave detection unit that detects an interference wave that is transmitted from other than the antenna and is an external radio wave having a band overlapping the predetermined frequency band;
The electronic apparatus according to claim 1, wherein the transmission control unit suspends the start of transmission of radio waves from the antenna when the interference wave detection unit detects the interference wave. In claim 3,
The transmission control unit starts transmission of the radio wave from the antenna when the interference wave detection unit stops detecting the interference wave after the start of transmission of the radio wave from the antenna is stopped. Electronic equipment. In claim 3,
The electronic device according to claim 1, wherein the transmission control unit starts transmission of radio waves from the antenna when a predetermined time has elapsed after the start of transmission of radio waves from the antenna. In any one of Claims 1-5,
The fraud determination unit compares the reflection loss calculated by the detection execution unit with the reflection loss registered in the reflection loss registration unit, and calculates the reflection loss calculated by the detection execution unit and the reflection loss registration. An electronic device characterized by determining that the electronic device is fraudulent when it is not determined that the reflection loss registered in the section substantially matches. In claim 6,
When the number of times that the fraud determination unit does not determine that the reflection loss calculated by the detection execution unit and the reflection loss registered in the reflection loss registration unit substantially match each other is a predetermined number or more And determining that the electronic device is illegal. In any one of Claims 1-7,
The electronic device is an in-vehicle device installed in a vehicle. In any one of Claims 1-8,
A detection unit for detecting on / off of the power supply of the electronic device;
When the detection unit detects that the electronic device is turned on, the detection control unit causes the transmission control unit to transmit a radio wave from the antenna, and the reflection loss calculation unit reflects the radio wave. Let me calculate the loss,
The fraud determination unit determines whether the electronic device is fraudulent by comparing the reflection loss calculated by the detection execution unit and the reflection loss registered in the reflection loss registration unit. Electronic equipment. In any one of Claims 1-8,
An on / off detector that detects on / off of the power supply of the electronic device;
When the on / off detection unit detects that the electronic device is turned off, the detection execution unit causes the transmission control unit to transmit a radio wave from the antenna, and the reflection loss calculation unit transmits the radio wave. While calculating the reflection loss,
The fraud determination unit determines whether the electronic device is fraudulent by comparing the reflection loss calculated by the detection execution unit and the reflection loss registered in the reflection loss registration unit. Electronic equipment. In claim 8,
The electronic device is connected to a vehicle battery and operates with electric power supplied from the vehicle battery.
A connection presence / absence detecting unit for detecting presence / absence of connection between the electronic device and the vehicle battery;
The detection execution unit detects a radio wave from the antenna by the transmission control unit when the connection presence / absence detection unit detects that the connection between the electronic device and the vehicle battery is released and power supply cannot be received. And the reflection loss calculation unit calculates the reflection loss of the radio wave,
The fraud determination unit determines whether the electronic device is fraudulent by comparing the reflection loss calculated by the detection execution unit and the reflection loss registered in the reflection loss registration unit. Electronic equipment. In any one of Claims 1-11,
The electronic device performs data processing related to payment of charges,
A payment information storage unit storing payment information necessary for data processing related to the payment of the fee;
When the fraud determination unit determines that the electronic device is fraudulent, the payment information stored in the payment information storage unit is deleted. In any one of Claims 1-11,
When the fraud determination unit determines that the electronic device is fraudulent, the reflection loss registered in the reflection loss registration unit is deleted. In claim 13,
Comprising an on / off detector for detecting on / off of the power supply of the electronic device,
The reflection loss to the reflection loss registration unit is detected when the on / off detection unit detects that the electronic device is turned on in the state where the reflection loss registered in the reflection loss registration unit is erased. An electronic device comprising: a first notification unit that notifies that re-registration is necessary. In any one of Claims 1-14,
An electronic device comprising: a second notification unit that notifies that the fraud of the electronic device has been detected when the fraud determination unit determines that the electronic device is fraudulent. In any one of Claims 1-15,
The detection execution unit causes the transmission control unit to transmit a radio wave from the antenna, and causes the reflection loss calculation unit to calculate a series of processes for calculating the reflection loss of the radio wave a plurality of times,
The fraud determination unit compares the reflection losses calculated by the reflection loss calculation unit at each time of the series of processes performed a plurality of times by the detection execution unit, and the reflection losses substantially match. When the determination is made, whether or not the electronic device is fraudulent is determined by comparing the reflection loss pattern composed of the reflection loss calculated by the detection execution unit with the reflection loss pattern registered in the reflection loss registration unit. An electronic device characterized by being determined. In any one of Claims 1-16,
A user authentication signal input unit for receiving and authenticating an input of a user authentication signal for authenticating that the user is an authorized user;
A release unit that temporarily prevents the fraud determination unit from determining whether the electronic device is fraudulent when the user authentication signal input unit receives and authenticates the user authentication signal; ,
A re-registration request input unit that accepts input from a user requesting re-registration of reflection loss to the reflection loss registration unit;
When the user authentication signal input unit accepts an input of the user authentication signal and is authenticated, the re-registration request input unit accepts an input from a user who requests the re-registration, and the transmission control unit While sequentially switching the frequency of radio waves to be transmitted from the antenna, the detection execution unit performs a series of processes for transmitting the radio waves sequentially from the antenna and calculating each reflection loss of the radio waves in the reflection loss calculation unit, An electronic apparatus comprising: a re-registration unit that re-registers each reflection loss calculated by the reflection loss calculation unit in the series of processing in the reflection loss registration unit. In claim 17,
The user authentication signal input unit includes a mounting unit for mounting an IC card, and receives the authentication data from an IC card stored in the mounting unit and storing authentication data for authenticating an authorized user. An electronic apparatus that authenticates that the user is a legitimate user by performing an authentication process by reading. In claim 17,
The user authentication signal input unit includes an operation input unit that receives an input of a password from a user, and receives an input of a password for authenticating that the user is an authorized user by the operation input unit, and performs an authentication process. An electronic device characterized by authenticating that it is a user. In any one of Claims 8-19,
The electronic device is an in-vehicle device installed in a vehicle,
The electronic device according to claim 1, wherein the antenna is a directional antenna provided so that a directivity direction thereof faces a metal portion provided in the vehicle. In claim 20,
The electronic device is installed on a surface made of at least one of resin and leather of the vehicle,
The antenna is provided so that the directivity direction faces an installation surface of the electronic device. In claim 20 or 21,
The electronic apparatus is characterized in that the antenna is provided so that the directivity direction does not face the seat direction of the vehicle. An electronic device that is fixedly installed,
An antenna for transmitting a radio wave of a predetermined frequency band to the outside of the vehicle-mounted device, and receiving a reflected wave of the transmitted radio wave;
An impedance measurement unit for measuring the impedance of the antenna;
An electronic device, comprising: a fraud determining unit that determines whether the electronic device is fraudulent based on the impedance measured by the impedance measuring unit.

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