Identification system

Abstract

To provide a technique for identifying a vehicle or a predetermined area without wireless communication.SOLUTION: An identification system includes a vehicle and an infrastructure device installed in a predetermined area. A first device being one of the vehicle and the infrastructure device includes an output device for outputting an electromagnetic wave or a sonic wave not for wireless communication. A second device being the other one of the vehicle and the infrastructure device includes a receiving device for receiving the electromagnetic wave or the sonic wave to be output from the output device of the first device. The first device outputs the electromagnetic wave or the sonic wave modulated to indicate an identification code of the first device from the output device. The second device identifies the first device based on the identification code indicated by the electromagnetic wave or the sonic wave received via the receiving device.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a technology for identifying a vehicle and a technology for identifying a predetermined area used by the vehicle. [Background technology]

[0002] Patent Document 1 discloses a control device used in an automated valet parking system. The control device wirelessly communicates with a vehicle that is about to enter a parking area, and receives characteristic information and identification information of the vehicle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2022 / 163025 Summary of the Invention [Problem to be solved by the invention]

[0004] The process described in Patent Document 1 cannot be executed in areas where wireless communication services are not provided.

[0005] One object of the present disclosure is to provide a technology capable of identifying a vehicle or a predetermined area without wireless communication. [Means for solving the problem]

[0006] One aspect of the present disclosure relates to an identification system. The identification system includes a vehicle and infrastructure devices installed in a given area. The first device, which is either the vehicle or the infrastructure device, includes an output device that outputs electromagnetic waves or sound waves that are not for wireless communication. The second device, which is the other of the vehicle and the infrastructure device, includes a receiving device that receives the electromagnetic waves or sound waves output from the output device of the first device. The first device is configured to output, from an output device, electromagnetic or acoustic waves modulated to indicate an identification code of the first device. The second device is configured to identify the first device based on an identification code represented by the electromagnetic or acoustic waves received via the receiving device. Effect of the Invention

[0007] According to the present disclosure, the first device includes an output device that outputs electromagnetic waves or sound waves that are not for wireless communication. Meanwhile, the second device includes a receiving device that receives the electromagnetic waves or sound waves output from the output device of the first device. The first device outputs, from the output device, electromagnetic waves or sound waves modulated to indicate an identification code of the first device. The second device identifies the first device based on the identification code indicated by the electromagnetic waves or sound waves received via the receiving device R. This makes it possible to identify the first device (vehicle or infrastructure device) without wireless communication. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a conceptual diagram for explaining a vehicle and a predetermined area. [Diagram 2] FIG. 1 is a conceptual diagram for explaining an identification system and an identification process according to a first embodiment. [Diagram 3] FIG. 13 is a conceptual diagram for explaining an identification system and an identification process according to a second embodiment. [Figure 4] FIG. 11 is a block diagram showing an example of the configuration of a vehicle and an infrastructure device according to a second embodiment. [Diagram 5] FIG. 13 is a conceptual diagram for explaining an identification system and an identification process according to a third embodiment. [Figure 6] FIG. 13 is a block diagram showing an example of the configuration of a vehicle and an infrastructure device according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0010] 1. First embodiment FIG. 1 is a conceptual diagram for explaining a vehicle 100 and a predetermined area AR. The predetermined area AR is an area used by the vehicle 100. The vehicle 100 enters and exits the predetermined area AR, drives within the predetermined area AR, and is parked within the predetermined area AR. Examples of the predetermined area AR include a parking lot, a factory site, a city, and the like. If the predetermined area AR is a parking lot that provides an automatic valet parking service, the vehicle 100 may be equipped with an automatic valet parking function. The vehicle 100 may be an autonomous vehicle.

[0011] An infrastructure device 200 is installed in the predetermined area AR. The infrastructure device 200 may be installed at an entrance to the predetermined area AR. The infrastructure device 200 is associated with the predetermined area AR and is responsible for at least a part of the management of the predetermined area AR.

[0012] For example, the infrastructure device 200 identifies the vehicle 100 that uses the predetermined area AR. In this specification, identifying is a concept that also includes authenticating. For example, the infrastructure device 200 is installed at the entrance of the predetermined area AR, and identifies (authenticates) the vehicle 100 that is about to enter the predetermined area AR. As another example, the infrastructure device 200 may identify the target vehicle 100 when remotely operating the vehicle 100 parked in the predetermined area AR.

[0013] As an example, consider the case where the predetermined area AR is a parking lot that provides an automatic valet parking service. The infrastructure device 200 is installed at the entrance of the parking lot. The user of the vehicle 100 specifies a parking lot and requests the use of the automatic valet parking service at the parking lot. When the vehicle 100 arrives at the entrance of the parking lot, the user gets off the vehicle 100. Then, at the entrance of the parking lot, the infrastructure device 200 checks whether the vehicle 100 is really a target for the requested automatic valet parking service. That is, at the entrance of the parking lot, the infrastructure device 200 identifies and authenticates the vehicle 100. After authenticating the vehicle 100, the infrastructure device 200 instructs the vehicle 100 to start automatic valet parking. The infrastructure device 200 may guide the vehicle 100 to an assigned parking space.

[0014] The subject of identification is not limited to the vehicle 100. Conversely, the vehicle 100 may identify a predetermined area AR (infrastructure device 200). For example, the vehicle 100 identifies the predetermined area AR in order to check whether the predetermined area AR is an area available for use by the vehicle 100. In the following description, it is assumed that "identifying the predetermined area AR" and "identifying the infrastructure device 200 associated with the predetermined area AR" are equivalent.

[0015] The identification system 1 according to the present embodiment includes a vehicle 100 and an infrastructure device 200 installed in a predetermined area AR. The identification system 1 executes an "identification process" for identifying the vehicle 100 or the predetermined area AR (infrastructure device 200).

[0016] FIG. 2 is a conceptual diagram for explaining the identification system 1 and the identification process according to this embodiment. The "first device 10" is one of the vehicle 100 and the infrastructure device 200, and the "second device 20" is the other of the vehicle 100 and the infrastructure device 200. Of these, the first device 10 is the subject of identification. The identification code IDC is identification information for identifying the first device 10. The identification code IDC may also serve as authentication information for authenticating the first device 10.

[0017] The first device 10 includes an output device O. The output device O outputs electromagnetic waves or sound waves that are not for wireless communication. In other words, the output device O outputs electromagnetic waves or sound waves without connecting to a communication network (e.g., wireless LAN, 5G, LTE).

[0018] For example, the output device O is a distance measurement sensor. A distance measurement sensor detects surrounding objects by outputting electromagnetic waves or sound waves and receiving the reflected waves, and also measures the distance to the detected object. Examples of distance measurement sensors include radar, LiDAR (Light Detection And Ranging), infrared sensors, sonar, etc. Examples of electromagnetic waves include radio waves, laser light, infrared rays, etc. Examples of sound waves include ultrasonic waves. The function of a distance measurement sensor that outputs electromagnetic waves or sound waves in this way is used as the output device O.

[0019] As another example, the output device O may only have a function of outputting electromagnetic waves or sound waves. For example, the output device O includes an antenna and a transmitter (Tx) that emit radio waves. As another example, the output device O may include a laser diode that emits laser light. As yet another example, the output device O may be a light source that emits visible light (e.g., a headlamp, a hazard lamp, etc.). As yet another example, the output device O may include a piezoelectric element that outputs sound waves. As yet another example, the output device O may include a horn.

[0020] On the other hand, the second device 20 includes a receiving device R. The receiving device R can receive electromagnetic waves or sound waves output from the output device O. In other words, the receiving device R can receive electromagnetic waves or sound waves output from the output device O without being connected to a communication network (e.g., wireless LAN, 5G, LTE).

[0021] For example, if the output device O outputs radio waves, the receiving device R includes an antenna and a receiver (Rx) for receiving the radio waves. As another example, if the output device O outputs laser light, the receiving device R may include a photodetector (e.g., a photodiode) for receiving the laser light. As yet another example, if the output device O outputs sound waves, the receiving device R may include a piezoelectric element for receiving the sound waves.

[0022] As another example, the receiving device R may be a distance measuring sensor. When the above-mentioned output device O is a distance measuring sensor, the receiving device R may be the same type of distance measuring sensor as the output device O. The function of the distance measuring sensor that receives electromagnetic waves or sound waves is utilized as the receiving device R.

[0023] The identification process for identifying the first device 10 is as follows. The first device 10 acquires an identification code IDC for identifying the first device 10 in advance. For example, the identification code IDC is represented by a numeric string. The identification code IDC may be fixed for each first device 10, or may be issued temporarily.

[0024] Then, the first device 10 outputs electromagnetic waves or sound waves having a pattern corresponding to the identification code IDC from the output device O. In other words, the first device 10 outputs electromagnetic waves or sound waves modulated to indicate the identification code IDC from the output device O. The modulation method is not particularly limited. Examples of the modulation method include on-off-keying (OOK), amplitude modulation, frequency modulation, phase modulation, pulse modulation, pulse width modulation, and the like.

[0025] For example, the first device 10 generates electromagnetic waves or sound waves that represent the identification code IDC by on-off modulation. In this case, the first device 10 generates pulses of electromagnetic waves or sound waves intermittently, and expresses the identification code IDC by turning the pulses on and off. For example, an on pulse is associated with data "1," and an off pulse is associated with data "0." The identification code IDC is expressed by the on / off pattern of the pulses over a certain period of time.

[0026] As another example, the first device 10 may generate electromagnetic or acoustic waves representing the identification code IDC by pulse width modulation. In this case, the first device 10 generates pulses of electromagnetic or acoustic waves intermittently and varies the pulse width according to the data value. A group of pulses over a certain period of time represents the identification code IDC.

[0027] The second device 20 receives the electromagnetic waves or sound waves output from the output device O of the first device 10 via the receiving device R. Furthermore, the second device 20 demodulates the electromagnetic waves or sound waves received via the receiving device R to obtain the identification code IDC. That is, the second device 20 reads the identification code IDC indicated by the electromagnetic waves or sound waves received via the receiving device R. Then, the second device 20 identifies the first device 10 based on the obtained identification code IDC.

[0028] The second device 20 may acquire in advance the identification code IDC of the first device 10 to be identified and store it in a storage device. In this case, the second device 20 identifies the first device 10 based on the identification code IDC indicated by the received electromagnetic waves or sound waves and the identification code IDC that it stores. For example, the second device 20 compares the received identification code IDC with the identification code IDC that it stores. If the two match, the second device 20 can identify (authenticate) the first device 10.

[0029] <Effects> As described above, according to this embodiment, the first device 10 includes an output device O that outputs electromagnetic waves or sound waves that are not for wireless communication. On the other hand, the second device 20 includes a receiving device R that receives electromagnetic waves or sound waves output from the output device O of the first device 10. The first device 10 outputs electromagnetic waves or sound waves modulated to indicate the identification code IDC of the first device 10 from the output device O. The second device 20 identifies the first device 10 based on the identification code IDC indicated by the electromagnetic waves or sound waves received via the receiving device R. This makes it possible to identify the first device 10 (vehicle 100 or infrastructure device 200) without wireless communication. The recognition process according to this embodiment can also be adopted in areas where wireless communication services are not provided.

[0030] The electromagnetic waves output from the output device O may be other than visible light. In this case, even during the day, the receiving device R can accurately detect the electromagnetic waves output from the output device O. This contributes to improving the accuracy of the identification process. In addition, in the case of light other than visible light, it is possible to prevent surrounding people from feeling dazzled.

[0031] The sound waves output from the output device O may be ultrasonic waves. In this case, even in a noisy environment, the receiving device R can accurately detect the sound waves output from the output device O. This contributes to improving the accuracy of the identification process. In addition, in the case of ultrasonic waves, it is possible to prevent surrounding people from feeling annoyed.

[0032] 2. Second embodiment 3 is a conceptual diagram for explaining the identification system 1 and the identification process according to the second embodiment. Descriptions that overlap with those of the first embodiment will be omitted as appropriate.

[0033] In the second embodiment, the first device 10 to be identified is a vehicle 100, and the second device 20 is an infrastructure device 200. The identification code IDC1 is an identification code for identifying the vehicle 100. The identification code IDC1 may be fixed for each vehicle 100 (user), or may be issued temporarily. The identification code IDC1 may also serve as authentication information for authenticating the vehicle 100.

[0034] The vehicle 100 includes an output device O, and the infrastructure device 200 includes a receiving device R. The vehicle 100 outputs electromagnetic waves or sound waves modulated to indicate an identification code IDC1 from the output device O. The infrastructure device 200 identifies the vehicle 100 based on the identification code IDC1 indicated by the electromagnetic waves or sound waves received via the receiving device R. This makes it possible to identify the vehicle 100 without wireless communication.

[0035] 4 is a block diagram showing an example of the configuration of the vehicle 100 and the infrastructure device 200 according to the second embodiment. The example of the configuration of the vehicle 100 and the infrastructure device 200 will be described below.

[0036] 2-1.Vehicle configuration examples The vehicle 100 includes a control device 110 , a communication device 120 , an on-board camera 130 , a distance measurement sensor 140 , a vehicle condition sensor 150 , and a driving device 160 .

[0037] The control device 110 is a computer that controls the vehicle 100. The control device 110 includes one or more processors 111 (hereinafter simply referred to as processor 111) and one or more storage devices 112 (hereinafter simply referred to as storage devices 112). The processor 111 executes various processes. Examples of the processor 111 include a central processing unit (CPU), a graphics processing unit (GPU), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), and the like. The storage device 112 stores various information. Examples of the storage device 112 include a hard disk drive (HDD), a solid state drive (SSD), a volatile memory, a non-volatile memory, and the like.

[0038] The control program PROG1 is a computer program for controlling the vehicle 100. The functions of the control device 110 may be realized by cooperation between the processor 111, which executes the control program PROG1, and the storage device 112. The control program PROG1 is stored in the storage device 112. Alternatively, the control program PROG1 may be recorded in a computer-readable recording medium.

[0039] The communication device 120 performs wireless communication via a wireless communication network. For example, the communication device 120 performs wireless communication with a management system 300. The management system 300 manages the vehicle 100, the infrastructure device 200, and a predetermined area AR. The communication device 120 may perform wireless communication with the infrastructure device 200.

[0040] The vehicle-mounted camera 130 captures the surroundings of the vehicle 100 and obtains an image showing the surroundings of the vehicle 100 .

[0041] The distance measurement sensor 140 detects surrounding objects by outputting electromagnetic waves or sound waves and receiving the reflected waves, and also measures the distance to the detected object. Examples of the distance measurement sensor 140 include radar, lidar, infrared sensor, sonar, etc. This distance measurement sensor 140 is used as the "output device O" shown in FIG. 3. In other words, the distance measurement sensor 140 originally installed in the vehicle 100 to detect objects around the vehicle 100 is also used as the "output device O" in the identification process. Therefore, additional parts and additional costs are not required.

[0042] The vehicle state sensor 150 detects the state of the vehicle 100 and acquires vehicle state information. For example, the vehicle state sensor 150 includes a speed sensor, an acceleration sensor, a yaw rate sensor, a steering angle sensor, and the like.

[0043] The traveling device 160 includes a steering device, a drive device, and a braking device. The steering device steers the wheels. For example, the steering device includes an electric power steering (EPS) device. The drive device is a power source that generates a driving force. Examples of the drive device include an engine, an electric motor, and an in-wheel motor. The braking device generates a braking force. The control device 110 performs vehicle traveling control by controlling the traveling device 160 based on vehicle state information.

[0044] Furthermore, the control device 110 recognizes the situation around the vehicle 100 using the on-board camera 130 and the distance measurement sensor 140. For example, the control device 110 detects objects around the vehicle 100 and acquires object information on the detected objects. Examples of objects around the vehicle 100 include pedestrians, other vehicles, and obstacles. Examples of obstacles include roadside structures, walls, buildings, utility poles, and the like. The object information indicates the relative position and relative speed of the object with respect to the vehicle 100.

[0045] The control device 110 may perform vehicle driving control while grasping the situation around the vehicle 100 based on the object information. For example, the control device 110 may perform automatic driving control. Here, automatic driving means that at least a part of the steering, acceleration, and deceleration of the vehicle 100 is performed automatically independent of the driver's operation. As an example, automatic driving of level 3 or higher may be performed. For example, the control device 110 generates a driving plan to a destination and generates a target trajectory for realizing the driving plan. The target trajectory includes a target position and a target speed of the vehicle 100. Then, the control device 110 performs vehicle driving control so that the vehicle 100 follows the target trajectory.

[0046] 2-2.Example of infrastructure device configuration The infrastructure device 200 includes a control device 210, a communication device 220, an infrastructure camera 230, and a receiving device 240.

[0047] The control device 210 is a computer that controls the infrastructure device 200. The control device 210 includes one or more processors 211 (hereinafter simply referred to as the processor 211) and one or more storage devices 212 (hereinafter simply referred to as the storage devices 212). The processor 211 executes various processes. Examples of the processor 211 include a CPU, a GPU, an ASIC, and an FPGA. The storage device 212 stores various information. Examples of the storage device 212 include an HDD, an SSD, a volatile memory, and a non-volatile memory.

[0048] The control program PROG2 is a computer program for controlling the infrastructure device 200. The functions of the control device 210 may be realized by cooperation between the processor 211 that executes the control program PROG2 and the storage device 212. The control program PROG2 is stored in the storage device 212. Alternatively, the control program PROG2 may be recorded in a computer-readable recording medium.

[0049] The communication device 220 communicates with the management system 300 via a communication network. The communication device 220 may perform wireless communication with the vehicle 100.

[0050] The infrastructure camera 230 is installed in the predetermined area AR. The infrastructure camera 230 may be installed at the entrance of the predetermined area AR. The infrastructure camera 230 photographs the situation in the predetermined area AR and acquires an image showing the situation in the predetermined area AR. The control device 210 grasps the situation in the predetermined area AR based on the image. The control device 210 can detect the vehicle 100 based on the image.

[0051] The receiving device 240 corresponds to the "receiving device R" shown in Fig. 3. That is, the receiving device 240 is configured to receive electromagnetic waves or sound waves output from the distance measurement sensor 140 (output device O) of the vehicle 100. For example, if the distance measurement sensor 140 is a radar, the receiving device 240 includes an antenna and a receiver (Rx) that receive radio waves. As another example, if the distance measurement sensor 140 is a lidar, the receiving device 240 includes a photodetector (e.g., a photodiode) that receives laser light. As yet another example, if the distance measurement sensor 140 is a sonar, the receiving device 240 may include a piezoelectric element that receives sound waves.

[0052] 2-3. Identification process The control device 110 of the vehicle 100 acquires in advance an identification code IDC1 for identifying the vehicle 100. For example, the management system 300 determines the identification code IDC1 of the vehicle 100 and provides the identification code IDC1 to the vehicle 100. In an environment where wireless communication is possible, the control device 110 acquires in advance the identification code IDC1 from the management system 300 via the communication device 120. The previously acquired identification code IDC1 is stored in the storage device 112.

[0053] An identification code database is stored in the storage device 212 of the infrastructure device 200. The identification code database indicates an identification code IDC1 for each vehicle 100. Typically, the identification code database indicates the identification code IDC1 of each of a large number of vehicles 100 that use a predetermined area AR. The identification code database may be provided from the management system 300.

[0054] The identification process for identifying the vehicle 100 is as follows. The control device 110 of the vehicle 100 controls the distance measurement sensor 140 to output electromagnetic waves or sound waves modulated to indicate an identification code IDC1. The control device 210 of the infrastructure device 200 receives the electromagnetic waves or sound waves output from the distance measurement sensor 140 via the receiving device 240. The control device 210 then identifies the vehicle 100 based on the identification code IDC1 indicated by the received electromagnetic waves or sound waves. For example, the control device 210 identifies the vehicle 100 by comparing the received identification code IDC1 with the identification code IDC1 registered in the IDC database.

[0055] 2-4.Effects According to this embodiment, it is possible to identify the vehicle 100 without wireless communication. In addition, since the distance measurement sensor 140 originally installed in the vehicle 100 is also used as the output device O, additional parts and additional costs are not required.

[0056] 3. Third embodiment 5 is a conceptual diagram for explaining the identification system 1 and the identification process according to the third embodiment. Descriptions that overlap with those of the first and second embodiments will be omitted as appropriate.

[0057] In the third embodiment, the first device 10 to be identified is an infrastructure device 200, and the second device 20 is a vehicle 100. The vehicle 100 identifies the predetermined area AR in order to confirm whether the predetermined area AR is an area available for use by the vehicle 100. Note that "identifying the predetermined area AR" is equivalent to "identifying the infrastructure device 200 associated with the predetermined area AR." The identification code IDC2 is an identification code for confirming whether the predetermined area AR is an area available for use by the vehicle 100. The identification code IDC2 may be fixed for each predetermined area AR (infrastructure device 200), or may be issued temporarily.

[0058] The infrastructure device 200 includes an output device O, and the vehicle 100 includes a receiving device R. The infrastructure device 200 outputs electromagnetic waves or sound waves modulated to indicate an identification code IDC2 from the output device O. The vehicle 100 identifies the infrastructure device 200 based on the identification code IDC2 indicated by the electromagnetic waves or sound waves received via the receiving device R. This makes it possible to identify the infrastructure device 200 without wireless communication.

[0059] 6 is a block diagram showing an example of the configuration of a vehicle 100 and an infrastructure device 200 according to the third embodiment. Descriptions that overlap with those in the above-mentioned second embodiment will be omitted.

[0060] The distance measurement sensor 140 mounted on the vehicle 100 is used as the "receiving device R" shown in Fig. 5. That is, the distance measurement sensor 140 originally mounted on the vehicle 100 to detect objects around the vehicle 100 is also used as the "receiving device R" in the identification process. Therefore, additional parts and additional costs are not required.

[0061] The infrastructure device 200 includes an output device 250. The output device 250 corresponds to the "output device O" shown in Fig. 5. The output device 250 outputs electromagnetic waves or sound waves that can be received by the distance measurement sensor 140 of the vehicle 100.

[0062] The control device 210 of the infrastructure device 200 acquires in advance the identification code IDC2 of the infrastructure device 200. For example, the management system 300 determines the identification code IDC2 of the infrastructure device 200 and provides the identification code IDC2 to the infrastructure device 200. The control device 210 acquires in advance the identification code IDC2 from the management system 300 via the communication device 220. The previously acquired identification code IDC2 is stored in the storage device 212.

[0063] An identification code database is stored in the storage device 112 of the vehicle 100. The identification code database indicates an identification code IDC2 for each infrastructure device 200. The identification code database may be provided by the management system 300.

[0064] The identification process for identifying the infrastructure device 200 is as follows. The control device 210 of the infrastructure device 200 controls the output device 250 to output electromagnetic waves or sound waves modulated to indicate the identification code IDC2. The control device 110 of the vehicle 100 receives the electromagnetic waves or sound waves output from the output device 250 via the distance measurement sensor 140. The control device 110 then identifies the infrastructure device 200 based on the identification code IDC2 indicated by the received electromagnetic waves or sound waves. For example, the control device 110 identifies the infrastructure device 200 by comparing the received identification code IDC2 with the identification codes IDC2 registered in the IDC database.

[0065] According to this embodiment, it is possible to identify the infrastructure device 200 without wireless communication. In addition, since the distance measurement sensor 140 originally installed in the vehicle 100 is also used as the receiving device R, additional parts and additional costs are not required. [Explanation of symbols]

[0066] 1...identification system, 10...first device, 20...second device, 100...vehicle, 200...infrastructure device, IDC...identification code, O...output device, R...receiving device

Claims

1. Vehicles and Infrastructure equipment installed in a designated area Including, a first device which is one of the vehicle and the infrastructure device, includes an output device which outputs electromagnetic waves or sound waves not for wireless communication; a second device which is the other of the vehicle and the infrastructure device, includes a receiving device which receives the electromagnetic wave or the sound wave output from the output device of the first device, The first device is configured to output, from the output device, the electromagnetic wave or the sound wave modulated to indicate an identification code of the first device. The second device is configured to identify the first device based on the identification code represented by the electromagnetic waves or the acoustic waves received via the receiving device. Identification system.

2. 2. The identification system of claim 1, the first device is the vehicle, The output device is any one of a radar, a lidar, an infrared sensor, and a sonar. Identification system.

3. 2. The identification system of claim 1, the second device is the vehicle, The receiving device is any one of a radar, a lidar, an infrared sensor, and a sonar. Identification system.

4. 2. The identification system of claim 1, The electromagnetic wave is other than visible light, The sound wave is an ultrasonic wave. Identification system.

5. An identification system according to any one of claims 1 to 4, comprising: The second device is configured to store the identification code in advance and to identify the first device based on the identification code indicated by the received electromagnetic wave or sound wave and the stored identification code. Identification system.

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