JP5157181B2 - Radio wave control system, method, and radio wave transmitter - Google Patents

Description

  The present invention relates to a radio wave control system and method, and more particularly, to a radio wave control system and method capable of preventing malfunction of a device affected by radio waves output from other devices. The present invention also relates to a radio wave transmitter used in such a radio wave control system and method.

  Portable devices that transmit radio waves, such as mobile phones and game devices, are becoming popular. Portable radio wave transmitters are convenient because they can make phone calls, etc., regardless of location, and the range of use is expanding. However, it has been pointed out that the radio waves transmitted by radio wave transmitters may cause damage due to electromagnetic interference on medical devices and precision machines represented by pacemakers, and there are situations where it is not desirable to use radio wave transmitters. .

  As a technique for reducing the influence on a device (hereinafter, also referred to as an electromagnetic interference damage device) that is damaged by electromagnetic waves due to radio waves output from the radio wave transmitting device, there is a technology described in Patent Document 1. In Patent Document 1, a specific radio wave is transmitted from the electromagnetic interference damage device, and when the radio wave transmitting device receives the specific radio wave, the radio wave transmission device stops the radio wave transmission function. Thereby, malfunction of the electromagnetic interference damage apparatus can be prevented.

  As another technique capable of reducing the influence on the electromagnetic interference damage device, there is a technique described in Patent Document 2. In this technique, a pacemaker measures position information of its own device and transmits it. The cellular phone extracts the position information of the pacemaker from the signal received from the pacemaker, and calculates the distance from the pacemaker from this position information and the position of the own device. If the distance between the mobile phone and the pacemaker is within a predetermined distance, transmission of radio waves is stopped. Patent Document 2 also describes that a user of a mobile phone is warned when the distance between the mobile phone and the pacemaker is within a predetermined distance.

  Patent Document 3 describes a technique for weakening an output radio wave of a mobile phone in a specific area where an electromagnetic interference damage device exists. In this technology, the strength of the output radio wave is variable in the mobile phone, and the output radio wave “strong” and the output radio wave “weak” can be switched by a changeover switch. In Patent Document 3, a transmitter that transmits a weak radio signal is installed in a specific area, and when the mobile phone receives a radio signal from the transmitter, the output radio wave is switched to “weak”. Is described.

JP 2005-51820 A JP 2003-189359 A JP-A-11-150750

  In the techniques described in Patent Documents 1 and 2, malfunction of the electromagnetic interference damage device can be prevented by stopping the radio wave. However, when the radio wave is stopped, calls and the like are uniformly regulated, and for example, it becomes impossible to contact the police / emergency, so a practical problem remains. Also, if you have a radio transmission device with a positioning function for your child and are using the location service, the radio transmission device will be out of service area by stopping the radio wave and you will not be able to use the service. It becomes. In this case, there is a possibility of becoming “out of range” at a place that would not be “out of range”, which may cause misidentification such as an accident.

  In Patent Document 3, since the output radio wave is switched to “weak” instead of suddenly stopping the radio wave in a specific area, it is possible to continue communication using a mobile phone. However, even when the output radio wave is set to “Weak”, if the distance between the electromagnetic interference damage device and the mobile phone is short, the electromagnetic interference damage device may be affected by the radio wave transmitted from the mobile phone, and errors due to electromagnetic interference. Operation may occur. In addition, when the radio wave output intensity of the mobile phone is weakened in a specific area, there is a problem that communication between the mobile phone and the base station is interrupted and the use of the service may be stopped.

  The present invention provides a radio wave control system, method, and radio wave transmitter that can solve the above-described problems of the prior art, reduce the influence on the electromagnetic interference damage device as much as possible, and reduce the influence on the currently used service. The purpose is to provide.

In order to achieve the above object, a radio wave control system according to the present invention includes a radio wave transmitter that communicates with other communication devices using radio waves, and an electromagnetic interference damage device that causes the radio waves output by the radio wave transmitter to cause electromagnetic interference. respect, the communication means using radio waves of a specific frequency that does not cause electromagnetic interference, the a radio transmission device and a radio wave control system comprising a control signal transmitter, a performing communication, the control signal transmitting device, the self A control signal transmitting unit that transmits a control signal indicating that radio wave irradiation to a position where the apparatus is installed is not preferable to the radio wave transmitting device using the radio wave at the specific frequency by the communication unit; instrument comprises a plurality of antennas, a control signal transmitted using radio waves of the specific frequency from the control signal transmitting section of the control signal transmitter, the plurality of a A control signal receiving unit received by a tenor, and a calculation unit for calculating a direction in which a control signal transmission device that is a transmission source of the control signal exists from a phase difference between the control signals respectively received by the plurality of antennas; A radio wave transmission unit that transmits radio waves to the other communication devices via the plurality of antennas, and the radio wave transmission unit avoids a direction in which the control signal transmission device calculated by the calculation unit exists. In addition, the directivity of the radio wave transmitted to the other communication device is controlled.

Radio wave control method of the present invention, a radio wave transmission equipment for communicating with other communication devices by radio waves, to the radio wave output by the radio transmission device electromagnetic interference damage device causing electromagnetic interference, causing electromagnetic interference a communication means using radio waves do not have a specific frequency, said a radio transmitting apparatus and radio wave control method of the radio wave control system comprising a control signal transmitter, a performing communication, the control signal transmitting device, the device itself is installed A step of transmitting a control signal indicating that radio wave irradiation to a certain position is not preferable, using the communication means, using the radio wave of the specific frequency, to the radio wave transmitter ; and the radio wave transmitter including a plurality of antennas, a control signal transmitted using radio waves of the specific frequency, receiving at the plurality of antennas, the radio wave transmission equipment, by the plurality of antennas Calculating the direction in which the control signal transmission device that is the transmission source of the control signal exists from the phase difference between the received control signals, and the radio wave transmitting device to the other communication device. Transmitting a radio wave via an antenna, and in the step of transmitting the radio wave, directing a radio wave to be transmitted to the other communication device so as to avoid a direction in which the calculated control signal transmitting device exists It is characterized by controlling sex.

  In the radio wave control system and method of the present invention, when the radio wave transmitting device receives the control signal transmitted by the control signal transmission device, it calculates the direction in which the control signal transmission device of the control signal transmission source is present and avoids the direction. To control the output radio wave. In the control of the output radio wave, for example, the directivity of the radio wave is controlled so that the output radio wave is weakened in the direction in which the control signal transmission device exists. For base stations that exist in a direction different from the direction near the control signal transmission device, communication can be performed with radio waves having the same strength as before output radio wave control, and radio waves can be stopped or output radio waves can be uniformly output. Compared with the conventional technology that weakens the service, the impact on the services currently used can be reduced.

In the radio wave control system of the present invention, the calculation unit, calculates a result, adopted further comprising configuring the control unit for displaying the direction in which the calculated control signal transmitting unit is present on the display screen in the direction of the control signal transmitting device can do. In this case, the user can know in which direction there is a device or area where radio wave transmission is not preferable, and by moving so as to avoid that direction, the radio wave transmission device can continue communication and radio wave transmission It is possible to avoid a situation where devices and areas that are not preferred are exposed to radio waves.

The radio wave control system of the present invention, the control signal transmitter, the being installed corresponding to the electromagnetic interference damage apparatus, the radio transmission unit, so as to avoid the radio wave radiation with respect to the electromagnetic interference damage device, the other The structure which controls the directivity of the electromagnetic wave transmitted to other communication equipment can be employ | adopted. The control signal transmission device is installed in the vicinity of the electromagnetic interference damage device. Or you may incorporate in an electromagnetic interference damage apparatus. When the radio wave transmission device outputs the radio wave by avoiding the control signal transmission device, it is possible to avoid the radio wave irradiation to the electromagnetic interference damage device corresponding to the control signal transmission device. It is possible to prevent malfunctions caused by radio waves.

In the radio wave control system of the present invention, a configuration wherein the control signal is seen containing a device attribute information specifying the attributes of the electromagnetic interference damage device described above, which further executes a process corresponding to the contents of the device attribute information Can be adopted. For example, when the control signal includes the type of the electromagnetic interference damage device, the radio wave transmission device decodes the control signal, identifies the type of the electromagnetic interference damage device, and indicates it to the user. It is possible to know whether there are any electromagnetic interference damage devices. Further, when including the intensity of the illumination wave which control signal is acceptable, control section is, by controlling the output wave as a radio wave radiated electromagnetic interference damage apparatus is in the range of acceptable values, electromagnetic interference It is possible to prevent malfunction of the damage device. When the control signal includes information regarding an allowable approach distance, the user can know the accessible distance by indicating this to the user. Further, when the distance between the radio wave transmission device and the electromagnetic interference damage device is within an allowable approach distance, the radio wave transmission device may stop the output radio wave.

In the radio wave control system of the present invention, the control signal transmission device is installed corresponding to an area where radio wave irradiation by the radio wave transmitter is not preferable, and the radio wave transmission unit avoids an area where the radio wave irradiation is not preferable. Thus, the structure which controls the directivity of the electromagnetic wave transmitted to the said other communication apparatus is employable . In this case, the control signal may include area attribute information that specifies an attribute of an area where radio wave irradiation is not preferable, and the control unit may employ a configuration that executes processing according to the content of the area attribute information. For example, a control signal transmission device is installed corresponding to a manner area such as a hospital or a train. By doing in this way, the radio wave irradiation with respect to the area corresponding to a control signal transmitter can be avoided, and the malfunction of the electromagnetic interference damage apparatus which exists in the area can be prevented.

In the radio wave control system of the present invention, the radio wave transmission unit is configured such that the intensity of the radio wave radiated in the direction in which the control signal transmission device exists is weaker than the intensity of the radio wave radiated in the direction in which the control signal transmission device does not exist. As described above, a configuration for controlling the directivity of the radio wave transmitted to the other communication device can be employed. Further, the calculation unit further calculates a distance between the control device and the control signal transmission device from the reception intensity of the control signal received by the control signal reception unit, and the radio wave transmission unit is calculated by the calculation unit. Based on the calculated distance, a configuration for controlling the intensity of the radio wave transmitted to the other communication device can be employed. For example, when the control signal transmitter is located in the northeast direction as viewed from the radio transmitter, the radio wave directivity is controlled so that the radio field intensity in the northeast and southwest directions is weaker than the radio field intensity in the northwest and southeast directions. To do. By doing in this way, an electromagnetic wave can be weakened about a specific direction. For example, an array antenna can be used to control the directivity of the output radio wave.

The radio wave transmission device of the present invention is a radio wave transmission device that communicates with other communication devices by radio waves, and includes a plurality of antennas, and the radio waves that are output by the radio wave transmission device cause electromagnetic interference. A control signal for receiving a control signal transmitted from a transmission source device using a radio wave of a specific frequency that does not cause electromagnetic interference to the device to the effect that radio wave irradiation by the radio wave transmission device is not preferable, using the plurality of antennas A receiving unit, a calculating unit that calculates a direction in which a device that is a transmission source of the control signal exists from a phase difference between control signals respectively received by the plurality of antennas, and the plurality of antennas to the other communication device A radio wave transmission unit that transmits radio waves via the radio communication unit, wherein the radio wave transmission unit avoids a direction in which a transmission source device of the calculated control signal exists. And controlling the radio wave directivity to be transmitted to the vessel.

In the radio wave transmission device of the present invention, the calculation unit further calculates a distance between the own apparatus and the transmission source device of the control signal from the reception intensity of the control signal received by the control signal reception unit, The transmission unit can employ a configuration that controls the intensity of the radio wave transmitted to the other communication device based on the distance calculated by the calculation unit.

In the radio wave transmitter according to the aspect of the invention, when the calculation unit calculates the direction of the transmission source device of the control signal, the control unit displays the direction in which the calculated transmission source device of the control signal exists on the display screen. Furthermore, the structure provided can be employ | adopted.

In the radio wave transmitter according to the present invention, the radio wave transmitter may be configured such that the intensity of the radio wave radiated in the direction in which the control signal transmission source device exists is the intensity of the radio wave radiated in the direction in which the control signal transmission source device does not exist. It is possible to employ a configuration for controlling the directivity of the radio wave transmitted to the other communication device so as to be weaker.

  In the radio wave control system and method of the present invention, when the radio wave transmission device receives the control signal transmitted by the control signal transmission device, the direction of the control signal transmission device of the transmission source is calculated and the direction is avoided. Controls the output radio wave. In this way, while avoiding radio wave irradiation to devices (electromagnetic interference damage devices) and areas, communication with devices such as base stations existing in other directions can be continued. It is possible to reduce both the impact on the service and the reduction of the impact on the currently used service.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows the configuration of a radio wave control system according to an embodiment of the present invention. The radio wave control system 10 includes a radio wave transmission device 11 and a control signal transmission device 12. The radio wave transmitter 11 is a device that transmits radio waves, such as a mobile phone or a portable game device having a wireless communication function. The radio wave transmission device 11 uses radio waves that may affect electronic devices (electromagnetic interference damage device 13) such as medical devices as communication means.

  The control signal transmission device 12 transmits a control signal indicating that there is an electromagnetic interference damage device and radio wave irradiation is not preferable. For the transmission of this control signal, a communication means that does not affect the electromagnetic interference damage device 13, for example, a communication means that is physically different from a radio wave of a specific frequency that does not cause electromagnetic interference or a radio wave such as a sound wave and an infrared ray Use. The control signal transmission device 12 can include information such as the type of the electromagnetic interference damage device 13, the allowable radio wave intensity, and the allowable approach distance in the control signal. When receiving the control signal transmitted from the control signal transmission device 12, the radio wave transmission device 11 controls the output radio wave so that the electromagnetic interference damage device 13 is not irradiated with a strong radio wave.

  FIG. 2 shows the configuration of the radio wave transmitter 11. The radio wave transmitter 11 includes a control signal receiver 21, a position calculator 22, a controller 23, and a radio wave transmitter 24. The control signal receiver 21 receives the control signal transmitted by the control signal transmitter 12. The position calculation unit 22 calculates the direction in which the control signal transmission device 12 exists and the distance to the control signal transmission device 12 based on the received control signal. In this calculation, for example, the control signal receiving unit 21 receives a control signal by a plurality of antennas, and checks the reception intensity and phase of the control signal at each antenna, thereby controlling the control signal transmitting apparatus that is the transmission source of the control signal. The direction in which 12 is present is estimated (calculated). Further, for example, the output when the control signal transmitting device 12 transmits the control signal is set to a predetermined output, and the distance from the control signal transmitting device is determined based on the attenuation amount of the control signal received by the control signal receiving unit 21. Calculate

  The radio wave transmission unit 24 outputs radio waves from the antenna 25. As the antenna 25, an antenna capable of giving directivity to the output radio wave intensity is used. Specifically, an array antenna can be used as the antenna 25. The antenna 25 can also be used for receiving control signals. The control unit 23 controls the radio wave transmission unit 24 based on the direction and position calculated by the position calculation unit 22 and is output from the antenna 25 so that strong electromagnetic waves are not irradiated to the electromagnetic interference damage device 13. Controls the directivity and intensity of radio waves. The controller 23 prevents the electromagnetic interference damage device 13 from malfunctioning by preventing the radio wave transmission device 11 from irradiating the electromagnetic interference damage device 13 with a strong radio wave.

  FIG. 3 shows an operation procedure of the radio wave control system 10. A procedure for reducing the intensity of the radio wave transmitted by the radio wave transmitter 11 irradiated to the electromagnetic interference damage device 13 will be described with reference to FIG. The control signal transmission device 12 starts transmission of a control signal when the electromagnetic interference damage device 13 is exposed to a radio wave that may be affected (step S1). For example, when the radio signal transmitted by the radio wave transmission device 11 is detected, the control signal transmission device 12 starts transmission of the control signal. Alternatively, the user of the electromagnetic interference damage device 13 may manually start transmission of the control signal, or the control signal transmission device 12 may constantly transmit the control signal.

  The radio wave transmitter 11 receives the control signal transmitted from the control signal transmitter 12 by the control signal receiver 21, and recognizes that the electromagnetic interference damage device 13 exists in the surroundings (step S2). The position calculation unit 22 calculates the direction in which the control signal transmission device 12 exists and the distance to the control signal transmission device 12 based on the reception status of the control signal in the control signal reception unit 21 (step S3). ). Based on the direction and distance calculated by the position calculation unit 22, the control unit 23 controls the radio wave transmission unit 24 so as to avoid radio wave irradiation to the electromagnetic interference damage device 13 (step S4). Further, a warning is displayed on a screen display (not shown) indicating the direction in which the electromagnetic interference damage device 13 exists (step S5), and the user is voluntarily guided to move away from the area where the electromagnetic interference damage device 13 exists.

  In step S4, when the control signal includes information such as the type of electromagnetic interference damage device, the allowable radio wave intensity, and the allowable approach distance, the control unit 23 refers to the information and refers to the antenna 25. Determine the strength of the radio wave output. For example, when the control signal transmission device 12 exists in the northeast direction as viewed from the radio wave transmission device 11, the radio wave transmission unit 24 is controlled to increase the radio wave intensity in the northwest and southeast directions, and to the northeast and southwest. The directivity of the radio wave output from the antenna 25 is controlled so that the radio wave intensity in the direction is weakened so that the radio wave intensity applied to the electromagnetic interference damage device 13 is less than the allowable amount.

  In this embodiment, the control signal transmission device 12 transmits a control signal indicating that the electromagnetic interference damage device 13 exists, and when the radio wave transmission device 11 receives the control signal, the electromagnetic interference damage device 13 (control signal transmission device). 12) is calculated, and the directivity and intensity of the transmission radio wave are controlled so as to avoid the radio wave irradiation to the electromagnetic interference damage device 13. By doing so, it is not preferable to transmit a strong radio wave, the radio wave intensity in the direction where the electromagnetic interference damage device 13 is present can be weakened, and the influence on the electromagnetic interference damage device 13 can be suppressed. .

  For example, a pacemaker is considered as the electromagnetic interference damage device 13. In this case, the user of the pacemaker can control the radio wave directed toward him / her by carrying the control signal transmission device 12 and can avoid radio wave irradiation to the pacemaker. Further, instead of arranging the control signal transmission device 12 corresponding to each electromagnetic interference damage device 13, it is also possible to arrange the control signal transmission device 12 corresponding to a manner area such as an area in a hospital or a priority seat in a train. . In that case, radio waves directed to the area can be controlled, and radio wave irradiation to the electromagnetic interference damage apparatus 13 existing in the area can be avoided.

  In the prior art, when a signal corresponding to a control signal is received, if the radio field intensity is uniformly reduced in all directions, the radio wave reaches a base station or the like that exists in a direction where the electromagnetic interference damage device 13 does not exist. It is possible that communication will be interrupted. In this embodiment, since the directivity of the output radio wave is controlled and strong radio wave intensity can be maintained in the direction where the electromagnetic interference damage device 13 does not exist, communication with the base station existing in that direction is not interrupted. For this reason, it is possible to continue communication and service while avoiding radio wave irradiation to the electromagnetic interference damage device 13, and it is possible to avoid a situation in which the service becomes unusable by approaching the electromagnetic interference damage device 13.

  Further, in the present embodiment, the direction in which the control signal transmission device 12 exists and the distance between the control signal transmission device 12 are calculated, and this is displayed on the display screen to damage the electromagnetic interference to the user. An approach to the device 13 is warned. Thereby, the user can grasp | ascertain the position of the apparatus which does not like the electromagnetic interference which exists in an own periphery. By viewing the warning screen, the user can urge the user to stop using the radio wave voluntarily or evacuate from the area where the electromagnetic interference damage device 13 is present, thereby avoiding access to the electromagnetic interference damage device 13. can do.

  Note that, since the traveling direction of the radio wave transmission device 11 changes as the user moves, the direction of the control signal transmission device 12 viewed from the radio wave transmission device 11 may change as the user moves. In such a case, the control signal is continuously received, the direction of the control signal transmission device is calculated each time, and the output radio wave is controlled so as to avoid the direction in which the control signal transmission device 12 exists. . Further, a configuration may be adopted in which a gyro or the like is provided in the radio wave transmission device 11 so as to grasp the direction in which the radio wave transmission device 11 faces and to control the output radio wave so as to avoid the direction in which the control signal transmission device 12 exists.

  As mentioned above, although this invention was demonstrated based on the suitable embodiment, the electromagnetic wave control system of this invention, a method, and an electromagnetic wave transmission apparatus are not limited only to the said embodiment, The structure of the said embodiment To which various modifications and changes are made within the scope of the present invention.

The block diagram which shows the structure of the electromagnetic wave control system of one Embodiment of this invention. The block diagram which shows the structure of a radio wave transmission apparatus. The flowchart which shows the operation | movement procedure of an electromagnetic wave control system.

Explanation of symbols

10: Radio wave control system 11: Radio wave transmitter 12: Control signal transmitter 13: Electromagnetic interference damage device 21: Control signal receiver 22: Position calculator 23: Controller 24: Radio transmitter 25: Antenna

Claims (13)

A radio transmission device which communicates with other communication devices by radio waves, to the radio wave output by the radio wave transmission equipment electromagnetic interference damage device causing electromagnetic interference, communication using a radio wave of a specific frequency that does not cause electromagnetic interference Means , a radio signal control system comprising a control signal transmitting device for communicating with the radio wave transmitting device,
The control signal transmitter is
A control signal transmitting unit for transmitting a control signal indicating that radio wave irradiation to a position where the apparatus is installed is not preferable, using the communication unit, using the radio wave of the specific frequency, to the radio wave transmitter;
Prepared,
The radio wave transmitting device is
Comprises a plurality of antennas, a control signal transmitted using radio waves of the specific frequency from the control signal transmitting section of the control signal transmitter, and a control signal receiving unit for receiving at the plurality of antennas,
A calculation unit that calculates a direction in which a control signal transmission device that is a transmission source of the control signal exists from a difference in phase of the control signal respectively received by the plurality of antennas;
A radio wave transmitter that transmits radio waves to the other communication devices via the plurality of antennas;
With
The radio wave control system, wherein the radio wave transmission unit controls directivity of a radio wave to be transmitted to the other communication device so as to avoid a direction in which the control signal transmission device exists calculated by the calculation unit. . The calculation unit further calculates a distance between the own device and the control signal transmission device from the reception intensity of the control signal received by the control signal reception unit,
The radio wave control system according to claim 1, wherein the radio wave transmission unit controls the intensity of a radio wave transmitted to the other communication device based on the distance calculated by the calculation unit.   The radio wave control according to claim 1, further comprising: a control unit that, when the calculation unit calculates a direction of the control signal transmission device, displays a direction in which the calculated control signal transmission device exists on a display screen. system. The control signal transmission device is installed corresponding to the electromagnetic interference damage device, and the radio wave transmission unit transmits a radio wave to be transmitted to the other communication device so as to avoid radio wave irradiation to the electromagnetic interference damage device. The radio wave control system according to any one of claims 1 to 3, which controls directivity. The radio wave control system according to claim 3 , wherein the control signal includes device attribute information that specifies an attribute of the electromagnetic interference damage device, and the control unit further executes a process according to the content of the device attribute information. Said control signal transmitting apparatus, the radio wave transmission radio wave irradiation are installed corresponding to the undesirable area by the device, the radio transmission unit, so that the radio wave irradiation avoid undesirable area, the other communication devices The radio wave control system according to any one of claims 1 to 3, which controls directivity of a radio wave transmitted to the radio. It said control signals comprise area attribute information radio wave radiating by the radio wave transmission equipment to identify the attributes of undesirable areas, wherein the control unit further executes a process corresponding to the contents of the area attribute information, to claim 3 The radio wave control system described. The radio wave transmitting unit transmits the intensity of the radio wave radiated in the direction in which the control signal transmission device exists to the other communication device so that the intensity of the radio wave radiated in the direction in which the control signal transmission device does not exist . The radio wave control system according to any one of claims 1 to 7, which controls directivity of a radio wave to be transmitted . A radio wave transmitter that communicates with other communication devices via radio waves,
A plurality of antennas, the radio wave output by the radio wave transmission device is transmitted from the transmission source device using a radio wave of a specific frequency that does not cause electromagnetic interference, to the electromagnetic interference damage device that causes electromagnetic interference, A control signal receiving unit that receives a control signal indicating that radio wave irradiation by the radio wave transmitting device is not preferable, using the plurality of antennas;
A calculation unit that calculates a direction in which a transmission source device of the control signal exists from a phase difference between control signals respectively received by the plurality of antennas;
A radio wave transmitter that transmits radio waves to the other communication devices via the plurality of antennas;
With
The radio wave transmission device, wherein the radio wave transmission unit controls directivity of a radio wave to be transmitted to the other communication device so as to avoid a direction in which a transmission source device of the calculated control signal exists. The calculation unit further calculates a distance between the own apparatus and the transmission source device of the control signal from the reception intensity of the control signal received by the control signal reception unit,
The radio wave transmission device according to claim 9, wherein the radio wave transmission unit controls intensity of a radio wave transmitted to the other communication device based on the distance calculated by the calculation unit.   The calculation unit further includes a control unit that, when calculating the direction of the transmission source device of the control signal, displays a direction in which the calculated transmission source device of the control signal exists on a display screen. The radio wave transmitter described in 1. The radio wave transmission section, the intensity of radio waves to be irradiated in the direction transmission source device of the control signal is present, the so weaker than the intensity of the radio wave other irradiating in a direction transmission source device is not present in the control signal The radio wave transmission device according to any one of claims 9 to 11, which controls directivity of a radio wave transmitted to the communication device. A radio transmission device which communicates with other communication devices by radio waves, to the radio wave output by the radio wave transmission equipment electromagnetic interference damage device causing electromagnetic interference, communication using a radio wave of a specific frequency that does not cause electromagnetic interference A radio wave control method for a radio wave control system , comprising: a control signal transmission device that communicates with the radio wave transmission device;
A step wherein said control signal transmitting apparatus, which transmits a control signal indicating that the radio wave irradiation to a position where the own device is installed is undesirable, by the communication means, a radio wave of the particular frequency, to the radio wave transmission equipment,
The radio wave transmitting device including a plurality of antennas receiving a control signal transmitted using radio waves of the specific frequency with the plurality of antennas;
The radio wave transmitting device calculates a direction in which a control signal transmission device that is a transmission source of the control signal exists from a phase difference between control signals respectively received by the plurality of antennas;
The radio wave transmitting device transmitting radio waves to the other communication device via the plurality of antennas;
Have
In the step of transmitting a radio wave, a radio wave control method, wherein directivity of a radio wave transmitted to the other communication device is controlled so as to avoid a direction in which the calculated control signal transmission device exists.

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