JP7703345B2 - Wireless device and control method - Google Patents

Description

Embodiments of the present invention relate to a wireless device, a control method, and a distributed wireless network.

In recent years, there has been growing concern about electromagnetic pulses. For example, a high altitude electromagnetic pulse (HEMP) can cause widespread damage to all kinds of electronic equipment. Electronic equipment related to core infrastructure such as communication networks and power grids requires resistance to the effects of electromagnetic pulses that are far more powerful than conventional electromagnetic compatibility (EMC).

JP 2020-136606 A JP 2019-78446 A JP 2017-15312 A

Therefore, the objective is to provide technology that improves resistance to electromagnetic pulses.

A wireless device according to one embodiment includes a first electronic device unit and a second electronic device unit, a support unit, an estimation unit, and an adjustment unit. The support unit supports the first electronic device unit and the second electronic device unit in a state in which the first electronic device unit has resistance to an electromagnetic pulse having a first polarization direction incident at a predetermined angle, and the second electronic device unit has resistance to an electromagnetic pulse having a second polarization direction different from the first polarization direction incident at the predetermined angle. The estimation unit estimates the direction of arrival of the electromagnetic pulse based on position information of an electromagnetic pulse source that generates the electromagnetic pulse. The adjustment unit adjusts the attitude of the support unit based on the estimated direction of arrival so that the electromagnetic pulse is incident at the predetermined angle.

FIG. 1 is a diagram showing an example of the configuration of a distributed wireless network according to an embodiment. FIG. 2 is a diagram showing an example of the hardware configuration of a wireless device according to an embodiment. 5A and 5B are diagrams showing attitude control in the wireless device according to the embodiment. FIG. 2 is a block diagram showing an example of the configuration of an electronic device unit according to the embodiment. FIG. 2 is a block diagram showing an example of the functional configuration of a wireless device according to the embodiment. FIG. 13 is a diagram showing another example of the hardware configuration of a wireless device according to the embodiment. FIG. 13 is a diagram showing yet another example of the hardware configuration of the wireless device according to the embodiment. FIG. 1 is a diagram illustrating attitude control in a distributed wireless network according to an embodiment.

Hereinafter, the embodiments will be described with reference to the drawings. In order to avoid duplication of explanation, similar components are given similar reference numerals throughout the drawings. In addition, in some drawings, subscripts are added to the reference numerals to distinguish the individual components.

Figure 1 shows a schematic diagram of a core infrastructure 50 including a distributed wireless network according to an embodiment. As shown in Figure 1, the core infrastructure 50 includes a wireless ad-hoc network 10 as a distributed wireless network, and an observation device 30.

The wireless ad-hoc network 10 is a network constructed by multiple wireless devices, each of which directly and wirelessly communicates with surrounding wireless devices. The wireless devices are sometimes called nodes. In the example shown in FIG. 1, the wireless ad-hoc network 10 includes multiple wireless devices 20 and multiple user terminals 40 as nodes.

The wireless device 20 operates as a relay node that relays communications between each user terminal 40 and other communication devices. The portion of the wireless ad-hoc network 10 that includes the wireless device 20 is referred to as the relay network 12. For example, the user terminal 40-1 can transmit a packet to the user terminal 40-2 via the relay network 12. The user terminal 40 is, for example, a smartphone, a mobile phone, or a personal computer.

The wireless device 20 is, for example, a drone equipped with a wireless module. A drone is an example of a mobile device. A mobile device is not limited to an air vehicle such as a drone. A mobile device may be, for example, a vehicle such as an automobile. By using a mobile device as the wireless device 20, it is possible to efficiently build a communication network in an area where a communication network has not been laid or in an area damaged by a disaster. Note that some or all of the wireless devices 20 may be stationary devices.

Typically, the wireless devices 20 are deployed so that the communication area of each wireless device 20 includes two or more wireless devices 20. This ensures multiple propagation paths and improves the packet arrival rate. In addition, multiple propagation paths can be ensured by using multiple wireless modulation methods.

Some of the wireless devices 20 (wireless device 20-1 in the example shown in FIG. 1) are communicatively connected to a communication network NW such as the Internet or a mobile communication network. For example, a user terminal 40 can communicate with a communication device (e.g., a server) on the communication network NW via a relay network 12.

The topology of the wireless ad-hoc network 10 changes over time. For example, one of the wireless devices 20 may leave the wireless ad-hoc network 10 due to movement or failure. Also, a new wireless device 20 may be deployed and join the wireless ad-hoc network 10.

The observation device 30 detects a target that may be an electromagnetic pulse source 60 that generates an electromagnetic pulse. The electromagnetic pulse source 60 is, for example, a satellite or a drone equipped with a device that generates an electromagnetic pulse. In this case, the target is an aircraft, and the observation device 30 detects it with a radar. The observation device 30 is communicatively connected to the wireless ad-hoc network 10 via the communication network NW. Alternatively, the observation device 30 may be wirelessly connected directly to one of the wireless devices 20.

When the observation device 30 detects a target, it determines whether the detected target is a threat, i.e., whether the detected target is an electromagnetic pulse source 60. If the observation device 30 determines that the detected target is a threat, it transmits electromagnetic pulse information to the relay network 12 of the wireless ad-hoc network 10, instructing attitude control against the effects of the electromagnetic pulse. The electromagnetic pulse information may include position information of the electromagnetic pulse source 60. The position information of the electromagnetic pulse source 60 indicates a predicted position of the electromagnetic pulse source 60. The position information is expressed, for example, by a predicted time, latitude, longitude, and altitude. The electromagnetic pulse information is shared within the relay network 12. The wireless device 20 performs attitude control based on the electromagnetic pulse information to avoid the effects of the electromagnetic pulse.

A method for sharing electromagnetic pulse information within relay network 12 will be described. Note that the same method can be used for sharing information other than electromagnetic pulse information within relay network 12.

In the example shown in FIG. 1, wireless device 20-1 receives a packet including electromagnetic pulse information from observation device 30 via communication network NW. Wireless device 20-1 extracts data from the packet and determines whether the data is electromagnetic pulse information. If the data is electromagnetic pulse information, wireless device 20-1 stores the electromagnetic pulse information and broadcasts a packet including the electromagnetic pulse information to notify surrounding wireless devices 20 of the electromagnetic pulse information. Wireless devices 20-2 and 20-3 receive the packet broadcast by wireless device 20-1. Each of wireless devices 20-2 and 20-3 performs the same process as that described for wireless device 20-1. Specifically, each of wireless devices 20-2 and 20-3 extracts data from the packet, and when it is determined that the data is electromagnetic pulse information, it broadcasts a packet including the electromagnetic pulse information. As a result, wireless devices 20-4 and 20-5 receive the packet including the electromagnetic pulse information. In this way, the electromagnetic pulse information propagates through relay network 12.

Note that each wireless device 20 may receive packets containing the same electromagnetic pulse information from multiple wireless devices 20. When a wireless device 20 receives a packet containing the same electromagnetic pulse information as the electromagnetic pulse information it holds, it does not need to notify surrounding wireless devices 20 of the electromagnetic pulse information.

Figure 2 shows a schematic example of the structure of the wireless device 20. As shown in Figure 2, the wireless device 20 comprises multiple electronic device units 21, a housing 23 as a support, and a moving device 24. In Figure 2, the inside of the housing 23 is shown by seeing through a part of the housing 23. In the example shown in Figure 2, the wireless device 20 comprises two electronic device units 21-1 and 21-2. The electronic device unit 21-1 is connected to the electronic device unit 21-2 by a cable 22, and the electronic device included in the electronic device unit 21-1 exchanges signals with the electronic device included in the electronic device unit 21-2 via the cable 22. It is desirable to use optical fiber, which is resistant to electromagnetic waves, as the cable 22.

Electronic device unit 21-1 comprises boards 217-1 and 217-2, and multiple electronic devices mounted on the main surfaces of boards 217-1 and 217-2. Board 217-1 is connected to board 217-2 by cable 218, and the electronic device mounted on board 217-1 exchanges signals with the electronic device mounted on board 217-2 via cable 218. It is desirable to use optical fiber that is resistant to electromagnetic waves as cable 218. Electronic device unit 21-2 can have the same configuration as electronic device unit 21-1.

In the example shown in FIG. 2, each electronics unit 21 includes multiple boards 217. Alternatively, each electronics unit 21 may include a single board 217.

As an example, electronic device unit 21-1 is normally used. When a failure occurs in any of the electronic devices in electronic device unit 21-1 due to factors such as an electromagnetic pulse, the electronic device in electronic device unit 21-2 is used in place of the failed electronic device. Also, when a failure occurs in any of the electronic devices in electronic device unit 21-1 due to factors such as an electromagnetic pulse and electronic device unit 21-1 stops functioning, electronic device unit 21-2 is used.

The housing 23 houses the electronic device units 21-1 and 21-2. The housing 23 supports the electronic device units 21-1 and 21-2 in a state in which the electronic device unit 21-1 has resistance to horizontally polarized electromagnetic pulses incident on the housing 23 at a predetermined angle, and the electronic device unit 21-2 has resistance to vertically polarized electromagnetic pulses incident on the housing 23 at the predetermined angle. In the example shown in FIG. 2, the electromagnetic pulses incident on the housing 23 at a predetermined angle travel from the top surface of the housing 23 to the bottom surface of the housing 23. For example, the electronic device unit 21-1 is attached to the housing 23 in a state in which the main surfaces of its boards 217-1 and 217-2 are parallel to the electromagnetic pulses incident on the housing 23 at a predetermined angle, and the electronic device unit 21-2 is attached to the housing 23 in a state in which the main surfaces of its boards 217-1 and 217-2 are perpendicular to the electromagnetic pulses incident on the housing 23 at a predetermined angle.

The moving device 24 is a device that enables the wireless device 20 to move and change its attitude. The moving device 24 includes, for example, multiple propellers and multiple motors that rotate each propeller. The moving device 24 is attached to the housing 23. As shown in FIG. 3, the attitude of the wireless device 20 is controlled so that the electromagnetic pulse enters the housing 23 at a predetermined angle.

Figure 4 shows a schematic example of the structure of the electronic device unit 21. As shown in Figure 4, the electronic device unit 21 includes a processor 211, a memory 212, a wireless module 213, a gyro sensor 214, a GPS (Global Positioning System) device 215, and a battery 216. The processor 211 is electrically connected to the memory 212, the wireless module 213, the gyro sensor 214, the GPS device 215, and the battery 216, and controls their operations.

The processor 211 is a processing unit such as a CPU (Central Processing Unit) or MPU (Micro Processing Unit). The memory 212 stores various programs including a control program and data. Each program includes a plurality of computer-executable instructions. The processor 211 executes the programs stored in the memory 212. When the control program is executed by the processor 211, it causes the processor 211 to perform a series of processes described below.

The wireless module 213 includes a circuit for transmitting and receiving wireless signals. The gyro sensor 214 detects the angular velocity acting on the wireless device 20 and generates angular velocity information. The GPS device 215 receives GPS signals from GPS satellites, calculates the position of the wireless device 20 based on the received GPS signals, and generates position information of the wireless device 20. The battery 216 supplies power to the processor 211, the memory 212, the wireless module 213, the gyro sensor 214, and the GPS device 215.

FIG. 5 shows an example of the functional configuration of the wireless device 20. As shown in FIG. 5, the wireless device 20 includes a transmitter 251, a receiver 252, a data processor 253, a position information acquirer 254, an attitude information acquirer 255, an attitude controller 256, and a movement controller 259. The transmitter 251 and the receiver 252 can be realized by the processor 211 and the wireless module 213 shown in FIG. 4. The data processor 253 can be realized by the processor 211 shown in FIG. 4. The position information acquirer 254 can be realized by the processor 211 and the GPS device 215 shown in FIG. 4. The attitude information acquirer 255 can be realized by the processor 211 and the gyro sensor 214 shown in FIG. 4. The attitude controller 256 and the movement controller 259 can be realized by the processor 211 shown in FIG. 4 and the moving device 24 shown in FIG. 2.

The transmitter 251 wirelessly transmits a packet including the data to be transmitted to other wireless devices included in the wireless ad-hoc network 10. For example, the transmitter 251 broadcasts a packet including the electromagnetic pulse information to notify surrounding wireless devices of the electromagnetic pulse information. The transmitter 251 also transmits a packet including data addressed to the user terminal 40 to other wireless devices 20 or the user terminal 40.

The receiving unit 252 receives packets wirelessly transmitted by other wireless devices included in the wireless ad-hoc network 10. For example, the receiving unit 252 receives packets containing electromagnetic pulse information broadcast by other wireless devices 20. The receiving unit 252 also receives packets containing data addressed to the user terminal 40-2 from other wireless devices 20 or user terminal 40-1. Furthermore, the receiving unit 252 can also receive packets containing electromagnetic pulse information from the observation device 30 via the communication network NW.

The data processing unit 253 performs data processing. For example, the data processing unit 253 extracts data from a packet received by the receiving unit 252, stores the data in the memory 212 shown in FIG. 2, and performs processing according to the data. If the data is electromagnetic pulse information, the data processing unit 253 sends the electromagnetic pulse information to the attitude control unit 256. Furthermore, the data processing unit 253 generates a packet including the electromagnetic pulse information and broadcasts it by the transmitting unit 251.

The position information acquisition unit 254 acquires position information indicating the position of the wireless device 20. The attitude information acquisition unit 255 acquires attitude information indicating the attitude of the wireless device 20 (specifically, the housing 23). For example, the attitude information acquisition unit 255 calculates the attitude of the wireless device 20 based on angular velocity information obtained by the gyro sensor 214.

The attitude control unit 256 receives electromagnetic pulse information from the data processing unit 253, receives position information of the wireless device 20 from the position information acquisition unit 254, and receives attitude information of the wireless device 20 from the attitude information acquisition unit 255. The attitude control unit 256 controls the attitude of the housing 23 based on the electromagnetic pulse information, the position information of the wireless device 20, and the attitude information of the wireless device 20. The attitude control unit 256 includes an estimation unit 257 and an adjustment unit 258.

The estimation unit 257 estimates the direction of arrival of the electromagnetic pulse based on the position information of the electromagnetic pulse source contained in the electromagnetic pulse information and the position information of the wireless device 20. Although the direction of arrival of the electromagnetic pulse can be estimated, it is unclear whether the polarization direction of the electromagnetic pulse is horizontally polarized, vertically polarized, or circularly polarized.

The adjustment unit 258 adjusts the attitude of the housing 23 based on the direction of arrival estimated by the estimation unit 257 and the attitude information of the wireless device 20. For example, the adjustment unit 258 changes the attitude of the housing 23 based on the direction of arrival estimated by the estimation unit 257 so that the electromagnetic pulse is incident on the housing 23 at a predetermined angle (see FIG. 3). This results in the electronic device unit 21-1 having resistance to horizontally polarized electromagnetic pulses incident along the estimated direction of arrival, and the electronic device unit 21-2 having resistance to vertically polarized electromagnetic pulses incident along the estimated direction of arrival.

The movement control unit 259 controls the movement of the wireless device 20 based on the position information of the wireless device 20. For example, the movement control unit 259 moves the wireless device 20 so that the wireless device 20 is located at a point specified by a control device (not shown).

As described above, wireless device 20 has a structure in which the electronic device units are made redundant with respect to the polarization direction of the electromagnetic pulse, and performs attitude control to maintain a constant angle with respect to the direction of arrival of the electromagnetic pulse. This increases the resistance of wireless device 20 to electromagnetic pulses with unknown polarization directions. For example, when a vertically polarized electromagnetic pulse is incident on wireless device 20, even if electronic device unit 21-1 fails and stops functioning, electronic device unit 21-2 may remain. As a result, wireless ad hoc network 10 is maintained.

In the above example, the wireless device 20 changes its attitude depending on the direction from which the electromagnetic pulse comes. However, it may be difficult to change the attitude of the wireless device 20 due to constraints on environmental conditions such as range of movement. In this case, the wireless device 20 may be configured to change the attitude of the electronic device unit.

Figure 6 shows a schematic diagram of another example structure of the wireless device 20 according to the embodiment. In the example shown in Figure 6, the wireless device 20 includes electronic device units 21-1 and 21-2, a housing 23, and a moving device 24. The housing 23 includes a housing main body 231 and a support frame 232 as a support section. In Figure 6, the inside of the housing 23 is shown through a portion of the housing main body 231 and the support frame 232.

The support frame 232 is provided on the housing body 231 so that its attitude relative to the housing body 231 can be changed. For example, the support frame 232 is attached to the housing body 231 so that it can rotate around an axis. The support frame 232 supports the electronic device units 21-1 and 21-2 in a state in which the electronic device unit 21-1 is resistant to a horizontally polarized electromagnetic pulse that is incident on the support frame 232 at a predetermined angle, and the electronic device unit 21-2 is resistant to a vertically polarized electromagnetic pulse that is incident on the support frame 232 at the predetermined angle. In this example, the attitude of the support frame 232 is controlled according to the direction of arrival of the electromagnetic pulse, and the attitude of the wireless device 20 (housing 23) is maintained.

In the above example, attitude control is performed according to the direction of arrival of the electromagnetic pulse. However, there are cases where the direction of arrival of the electromagnetic pulse is unknown or attitude control is impossible. This section describes a method to improve resistance to electromagnetic pulses without attitude control.

Figure 7 shows a schematic diagram of yet another example structure of the wireless device 20 according to the embodiment. In the example shown in Figure 7, the wireless device 20 includes electronic device units 21-1, 21-2, 21-3, and 21-4, a housing 23, and a mobile device 24. In Figure 7, the inside of the housing 23 is shown with a portion of the housing 23 seen through. The electronic device units 21 are connected to each other by a cable 22. The cable 22 may be an optical fiber.

The housing 23 supports the electronic device units 21-1, 21-2, 21-3, and 21-4 in a state in which the electronic device unit 21-1 has resistance to a horizontally polarized electromagnetic pulse incident on the wireless device 20 (housing 23) at a first angle, the electronic device unit 21-2 has resistance to a vertically polarized electromagnetic pulse incident on the wireless device 20 at a first angle, the electronic device unit 21-3 has resistance to a horizontally polarized electromagnetic pulse incident on the wireless device 20 at a second angle, and the electronic device unit 21-4 has resistance to a vertically polarized electromagnetic pulse incident on the wireless device 20 at a second angle. The first angle is different from the second angle. Thus, in the example shown in FIG. 7, the wireless device 20 has a structure with angle-dependent electromagnetic wave resistance.

For example, when a horizontally polarized electromagnetic pulse is incident on wireless device 20 at a first angle or an angle close to the first angle, electronic device unit 21-1 may remain even if electronic device units 21-2, 21-3, and 21-4 fail and stop functioning. Also, when a vertically polarized electromagnetic pulse is incident on wireless device 20 at a second angle or an angle close to the second angle, electronic device unit 21-4 may remain even if electronic device units 21-1, 21-2, and 21-3 stop functioning.

A wireless device 20 having the structure shown in FIG. 7 has high resistance to electromagnetic pulses even when the direction of arrival of the electromagnetic pulse is unknown or attitude control is impossible.

The electronic device included in each electronic device unit 21 is preferably a device with high error resistance. A device with high error resistance may be, for example, a semiconductor integrated circuit with a built-in memory circuit. A device with built-in memory has a very short wiring length, and therefore is less susceptible to electromagnetic pulses. For example, a reconfigurable semiconductor integrated circuit such as an FPGA (Field Programmable Gate Array) can be used as the processor 211 and memory 212 shown in FIG. 2. In this case, for example, a configuration memory circuit disclosed in Japanese Patent Application Laid-Open No. 2019-160930 can be used as the memory circuit. When a non-volatile memory is used as the memory circuit, the written data can be repeatedly updated. Therefore, a control element (a component inside the electronic device) in which a failure has occurred can be self-repaired. As a result, the wireless device 20 can prepare for the effects of the next electromagnetic pulse.

In the examples described with reference to Figures 1 to 5, the wireless devices 20 assume the same posture. Alternatively, the wireless devices 20 may be classified into multiple groups in which different postures are set. In an embodiment in which the wireless devices 20 are classified into multiple groups in which different postures are set, the wireless devices 20 may include a single electronics unit, or may include multiple electronics units as in the examples described with reference to Figures 2 to 5.

Figure 8 shows a schematic diagram of a wireless ad-hoc network 10 according to an embodiment, illustrating a method for improving resistance to electromagnetic pulses even without an observation device. In the example shown in Figure 8, the wireless ad-hoc network 10 includes 12 wireless devices 20-1 to 20-12, which are classified into three groups. A control device (not shown) groups the wireless devices 20 and sets an attitude for each group. The control device transmits attitude control information, including information indicating the group of each wireless device 20 and information indicating the attitude of each group, to the relay network 12 of the wireless ad-hoc network 10. The attitude control information is shared within the relay network 12.

When the wireless device 20 receives the electromagnetic pulse information, it performs attitude control. The wireless devices 20-1, 20-5, 20-8, and 20-12 belonging to the first group take a first attitude. The wireless devices 20-2, 20-6, 20-7, and 20-11 belonging to the second group take a second attitude different from the first attitude. The wireless devices 20-3, 20-4, 20-9, and 20-10 belonging to the third group take a third attitude different from the first attitude and the second attitude.

In this way, the wireless devices 20 adopt a posture according to the group. This means that when an electromagnetic pulse is irradiated, there is a possibility that the wireless devices 20 that belong to a specific group will survive. The resistance to electromagnetic pulses is improved throughout the wireless ad-hoc network 10. As a result, the wireless ad-hoc network 10 can be maintained.

Fault information indicating which of the wireless devices 20 has experienced a fault due to an electromagnetic pulse may be shared within the wireless ad-hoc network 10. For example, if a wireless device 20 loses communication with other wireless devices 20 immediately after receiving an electromagnetic pulse, the wireless device 20 recognizes that a fault has occurred in that wireless device 20. The wireless device 20 broadcasts fault information including identification information for identifying the wireless device 20 that has experienced a fault.

The wireless device 20 may calculate a failure occurrence rate for each group based on the failure information. The failure occurrence rate indicates the number of wireless devices 20 in which a failure has occurred relative to the total number of wireless devices 20 in each group. The wireless device 20 takes a posture set to the group with the lowest failure occurrence rate. This increases survivability against the effects of a second electromagnetic pulse.

The wireless ad-hoc network 10 shown in FIG. 8 may include a wireless device 20 as described with respect to FIGS. 2 to 5. The wireless device 20 calculates a failure occurrence rate for each group, and estimates the direction of arrival of an electromagnetic pulse based on the failure occurrence rate for each group. The wireless device 20 takes a posture that makes it more resistant to an electromagnetic pulse coming from the estimated direction of arrival. Specifically, the wireless device 20 performs posture control so as to maintain a constant angle with respect to the estimated direction of arrival. This improves survivability against the effects of a second electromagnetic pulse.

Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention and its equivalents described in the claims.

10...wireless ad-hoc network, 12...relay network, 20...wireless device, 21...electronic device unit, 22...cable, 23...housing, 24...mobile device, 30...observation device, 40...user terminal, 50...core infrastructure, 60...electromagnetic pulse source, 211...processor, 212...memory, 213...wireless module, 214...gyro sensor, 215...GPS device, 216...battery, 217...board, 218...cable, 231...housing body, 232...support frame, 251...transmitter, 252...receiver, 253...data processor, 254...position information acquirer, 255...attitude information acquirer, 256...attitude controller, 257...estimator, 258...adjuster, 259...mobile controller.

Claims (8)

a first electronics unit and a second electronics unit;
a support section that supports the first electronic device unit and the second electronic device unit in a state in which the first electronic device unit has resistance to an electromagnetic pulse having a first polarization direction that is incident at a predetermined angle, and the second electronic device unit has resistance to an electromagnetic pulse having a second polarization direction that is different from the first polarization direction that is incident at the predetermined angle;
an estimation unit that estimates a direction of arrival of an electromagnetic pulse based on position information of an electromagnetic pulse source that generates the electromagnetic pulse;
an adjustment unit that adjusts the attitude of the support unit based on the estimated arrival direction so that the electromagnetic pulse is incident at the predetermined angle;
A wireless device comprising: The electromagnetic pulse having the first polarization direction is a horizontally polarized electromagnetic pulse, and the electromagnetic pulse having the second polarization direction is a vertically polarized electromagnetic pulse.
2. The wireless device of claim 1. the first electronic device unit includes a first substrate having a main surface and an electronic device mounted on the main surface of the first substrate, the second electronic device unit includes a second substrate having a main surface and an electronic device mounted on the main surface of the second substrate,
the supporting portion supports the first electronic device unit and the second electronic device unit in a state in which the main surface of the first substrate is parallel to the electromagnetic pulse incident at the predetermined angle, and the main surface of the second substrate is perpendicular to the electromagnetic pulse incident at the predetermined angle.
3. A wireless device according to claim 1 or 2. the support portion is a housing that houses the first electronic device unit and the second electronic device unit,
A wireless device according to any one of claims 1 to 3. a housing body that houses the first electronic device unit and the second electronic device unit,
The support portion is provided on the housing body so as to be capable of changing a posture of the support portion relative to the housing body.
A wireless device according to any one of claims 1 to 3. A control method executed by a wireless device including a first electronic device unit and a second electronic device unit, and a support section that supports the first electronic device unit and the second electronic device unit in a state in which the first electronic device unit has resistance to an electromagnetic pulse having a first polarization direction that is incident at a predetermined angle, and the second electronic device unit has resistance to an electromagnetic pulse having a second polarization direction different from the first polarization direction that is incident at the predetermined angle, the control method comprising:
estimating a direction of arrival of the electromagnetic pulse based on position information of an electromagnetic pulse source that generates the electromagnetic pulse;
adjusting a posture of the support unit based on the estimated direction of arrival so that the electromagnetic pulse is incident at the predetermined angle;
A control method comprising: a first electronic equipment unit, a second electronic equipment unit, a third electronic equipment unit, and a fourth electronic equipment unit;
a support section that supports the first electronic device unit and the second electronic device unit in a state in which the first electronic device unit has resistance to a horizontally polarized electromagnetic pulse incident at a first angle, the second electronic device unit has resistance to a vertically polarized electromagnetic pulse incident at the first angle, the third electronic device unit has resistance to a horizontally polarized electromagnetic pulse incident at a second angle different from the first angle, and the fourth electronic device unit has resistance to a vertically polarized electromagnetic pulse incident at the second angle;
A wireless device comprising: each of the first electronic equipment unit, the second electronic equipment unit, the third electronic equipment unit, and the fourth electronic equipment unit includes a semiconductor integrated circuit having a built-in memory circuit;
8. The wireless device of claim 7.