JP2008282347A - Human body detection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive human body detection system for improving stability of human body detection in a building. <P>SOLUTION: An intruder detection system 10 is provided with radio communication equipment 20 for generating electromagnetic waves and an intruder detection device 30 for detecting an intruder. The intruder detection device 30 is provided with an intruder detecting means for detecting an intruder according to a change in an electric field of the electromagnetic wave generated by the radio communication equipment 20 and a warning means for issuing a warning when an intruder is detected by the intruder detecting means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a human body detection system that detects a human body in a building using electromagnetic waves.

  Recently, as a result of encountering an intruder who was already in a dwelling unit when a single-living woman came home, there have been many incidents where the intruder was directly damaged or was killed in the worst case. It has become one of social unrest.

  One way to prevent such an incident is for a single person to make a contract with a security company. However, it is usually an economic burden for individuals who live alone to sign individual contracts with security companies. Therefore, there is a need for a technology that can be used economically even by a single person.

As a technique that can be used economically and easily, a technique for detecting an intruder in a building by electromagnetic waves can be considered. As a technique for detecting a human body by electromagnetic waves, a method using infrared rays generated from the human body (for example, see Patent Documents 1-3) and a method for detecting a suspicious person in a residence using electromagnetic waves (for example, Patent Documents). 4 and 5), a method of exploring survivors under the rubble of a building collapsed due to an earthquake or the like (for example, refer to Patent Document 6-9), and a radio wave generated by a television company. A method for detecting the presence or absence of a human body (see, for example, Non-Patent Document 1) is known.
Japanese Patent No. 2737287 JP-A-9-292473 JP 2001-297380 A Japanese Patent Laid-Open No. 7-175993 JP 2001-14561 A JP-A-9-304525 Japanese Patent Laid-Open No. 11-6874 Japanese Patent Laid-Open No. 11-202043 JP 2002-31153 A “Proposal of Indoor Intrusion Detection System Using TV Broadcasting Waves”, Masahiro Nishi, Akiaki Yoshida, 2005 IEICE General Conference, B-1-41

  However, in the technique described in Patent Documents 1-3, since it is necessary to install an infrared receiving device within a range that can be seen by an intruder, a large number of infrared receiving devices are required in a dwelling unit with many partitions, which is simplified. There is a problem that it is difficult to realize with a simple configuration. Furthermore, there has been a problem that the infrared receiver is affected by temperature changes and lacks stability.

  In addition, the techniques described in Patent Documents 4 and 5 have a problem that it is difficult to implement with a simple configuration because a device around a residence is required to detect a suspicious person.

  Moreover, since the technique described in Patent Documents 6-9 is premised on manned operation, further improvement for enabling unmanned operation is further required in order to be able to use it economically and easily. There was a problem.

  Moreover, in the technique described in Non-Patent Document 1, there is a problem that television radio waves cannot be stably received depending on the position of the dwelling unit in the building.

  The present invention has been made to solve the conventional problems, and an object thereof is to provide an inexpensive human body detection system capable of improving the stability of detection of a human body in a building.

  The human body detection system of the present invention includes an electromagnetic wave generation device that generates an electromagnetic wave and a human body detection device that detects the presence or absence of a human body, and the human body detection device performs the detection by changing the electric field of the electromagnetic wave. And warning means for giving a warning when the human body is detected by the human body detecting means.

  With this configuration, the human body detection system of the present invention detects a human body using electromagnetic waves generated by an electromagnetic wave generator rather than unstable electromagnetic waves such as infrared rays and television radio waves generated by the human body. The stability of the detection of the human body can be improved as compared with the prior art. Moreover, since the human body detection system of the present invention can be realized with a simple configuration, it can be realized at a lower cost than before.

  Further, the human body detection means of the human body detection system according to the present invention is characterized in that the detection is performed by a change in electric field of the electromagnetic wave having a frequency of 2.4 GHz band or 5 GHz band.

  With this configuration, the human body detection system of the present invention can use the frequency band of a widely used wireless LAN system.

  Further, the human body detection means of the human body detection system according to the present invention performs the detection by a change in the electric field of the electromagnetic wave having a frequency of 5 GHz band, intermittently transmitted, and a transmission duration of less than 4 ms. It is characterized by.

  With this configuration, the human body detection system of the present invention uses electromagnetic waves that are not required to be legally used, so that it can be used as easily as the wireless LAN system.

  The electromagnetic wave generation device of the human body detection system of the present invention is a mode switch for switching between a communication mode for performing communication using the electromagnetic wave and a human body detection mode for causing the human body detection device to perform the detection using the electromagnetic wave. A wireless communication device provided with means.

  With this configuration, the human body detection system of the present invention can use the frequency band of a widely used wireless LAN system.

  The human body detection means of the human body detection system of the present invention is characterized in that the detection is performed by changing the electric field of the electromagnetic wave in an empty channel among the channels for communication.

  With this configuration, the human body detection system of the present invention can make effective use of empty channels.

  Further, the human body detection means of the human body detection system of the present invention is characterized in that the detection is performed by a change in the electric field of the electromagnetic wave in the channel for communication, and the channel used for the detection is switched every predetermined time. To do.

  With this configuration, the human body detection system of the present invention uses a plurality of channels having different frequencies for human body detection. Therefore, compared with the case where only one channel is used for human body detection, the human body detection accuracy is improved. Can be improved.

  Further, the human body detection means of the human body detection system of the present invention is characterized in that the detection is performed by an electric field change of the electromagnetic wave transmitted intermittently and having a transmission interval of 100 ms or less.

  With this configuration, the human body detection system of the present invention can detect a movement of about 8.3 cm or less of a human body moving at a speed of 3 km / h, and therefore can detect a human body even if the human body moves slowly.

  In the human body detection system of the present invention, the transmission interval is 20 ms.

  With this configuration, the human body detection system of the present invention can detect a movement of about 1.7 cm of a human body moving at a speed of 3 km / h, and therefore can detect a human body even if the human body moves slowly.

  Further, the human body detection means of the human body detection system of the present invention is characterized in that the detection is performed at a plurality of time intervals of the electric field change.

  With this configuration, the human body detection system of the present invention can detect a human body when the time interval between the electric field changes a plurality of times corresponds to the movement time of a person (about 3 km / hour).

  Further, the human body detection means of the human body detection system of the present invention performs the detection by the electric field change of the electromagnetic wave transmitted intermittently, and the transmission interval is longer than the electromagnetic wave that has detected the human body when the human body is detected. The detection is performed again by a short electric field change of the electromagnetic wave.

  With this configuration, the human body detection system of the present invention can improve the human body detection accuracy compared to the case where the human body is not detected stepwise.

  The human body detection system of the present invention includes a plurality of terminals and an access point that communicates with the terminals, and the terminal includes an electromagnetic wave generation device that generates electromagnetic waves, and a human body detection device that detects human bodies. The human body detection device includes a human body detection unit that performs the detection based on a change in an electric field of the electromagnetic wave, and a warning unit that performs a warning when the human body is detected by the human body detection unit. A wireless communication apparatus comprising mode switching means for switching between a communication mode for performing communication using the electromagnetic wave and a human body detection mode for causing the human body detection apparatus to perform the detection using the electromagnetic wave, and the human body detecting means Performs the detection by the electric field change of the electromagnetic wave in an empty channel among the channels for the communication, and the plurality of terminals respectively The detection is performed by changing the electric field of the electromagnetic waves in the separate empty channels, and the access point is provided with the terminal using the empty channel where the human body is detected in the area where the human body is detected. It is characterized in that it is determined as an area.

  With this configuration, the human body detection system of the present invention can use the frequency band of a widely used wireless LAN system.

  The human body detection system of the present invention includes a plurality of terminals and an access point that communicates with the terminals, and the terminal includes an electromagnetic wave generation device that generates electromagnetic waves, and a human body detection device that detects human bodies. The human body detection device includes a human body detection unit that performs the detection based on a change in an electric field of the electromagnetic wave, and a warning unit that performs a warning when the human body is detected by the human body detection unit. A wireless communication apparatus comprising mode switching means for switching between a communication mode for performing communication using the electromagnetic wave and a human body detection mode for causing the human body detection apparatus to perform the detection using the electromagnetic wave, and the human body detecting means Performs the detection by the electric field change of the electromagnetic wave in an empty channel among the channels for the communication, and the plurality of terminals respectively The detection is performed by changing the electric field of the electromagnetic waves transmitted in different patterns, and the access point is configured to detect an area where the human body is detected, and the terminal performing the detection using the pattern where the human body is detected. It is determined that the area is an installed area.

  With this configuration, the human body detection system of the present invention can use the frequency band of a widely used wireless LAN system.

  Further, the separate patterns of the human body detection system of the present invention are characterized in that the number of transmissions in a predetermined time is different.

  With this configuration, the human body detection system of the present invention can use the frequency band of a widely used wireless LAN system.

  Further, the human body detection means of the human body detection system of the present invention is characterized in that the human body and a body of an animal other than a human are distinguished by a change in the electric field of the electromagnetic wave.

  With this configuration, the human body detection system of the present invention can prevent an animal body such as a pet from being erroneously detected as a human body.

  The human body detection method of the present invention is characterized in that an electromagnetic wave is generated, the presence / absence of a human body is detected by a change in the electric field of the electromagnetic wave, and a warning is given when the human body is detected.

  With this configuration, the human body detection method of the present invention detects a human body using stable electromagnetic waves instead of unstable electromagnetic waves such as infrared rays and television radio waves generated by the human body. Stability can be improved as compared with the prior art. Moreover, since the human body detection method of the present invention can be realized with a simple configuration, it can be realized at a lower cost than before.

  ADVANTAGE OF THE INVENTION According to this invention, the cheap human body detection system which can improve the stability of the detection of the human body in a building conventionally can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
First, the configuration of the intruder detection system as the human body detection system according to the first embodiment of the present invention will be described.

  As shown in FIG. 1, the intruder detection system 10 according to the present embodiment is one of the devices constituting a wireless LAN (Local Area Network) in a dwelling unit 90 (see FIG. 2) of a building such as an apartment. A wireless communication device 20 as an electromagnetic wave generation device that generates electromagnetic waves, and an intruder detection device 30 as a human body detection device that detects an intruder by an electric field change of the electromagnetic waves generated by the wireless communication device 20. ing.

  Wireless LANs have been used in homes as information communication devices have become popular due to recent advances in information communication technology (ICT). A wireless LAN can use a plurality of channels (up to 64 channels, usually about 8 channels for home use). In a wireless LAN, channels with different center frequencies are assigned to devices to avoid interference between adjacent areas. It seems that various devices will be connected in the future due to the progress of networking at home, but it seems that the number of devices actually used is within a few, and the channel capacity of the wireless LAN (in the case of 2.4 GHz shown in FIG. 3) 14 channels), it is assumed that there are always channels that are not used for communication, that is, empty channels.

  As shown in FIG. 4, the wireless communication device 20 communicates with the antenna 21 that transmits electromagnetic waves and other devices (not shown) installed in the dwelling unit 90 (see FIG. 2) via the wireless LAN. The communication part 22 to perform and the mode switching part 23 as a mode switching means which switches the mode which uses the electromagnetic wave of the wireless LAN in the dwelling unit 90 are provided.

  The mode switching unit 23 uses a wireless LAN electromagnetic wave in the dwelling unit 90 for normal communication by the communication unit 22 and a wireless LAN in the dwelling unit 90 for detecting a human body when the resident of the dwelling unit 90 is out. The human body detection mode using the electromagnetic wave is switched.

  As shown in FIG. 5, the intruder detection device 30 includes an antenna 31 that receives electromagnetic waves, and an amount of change in intensity of the electromagnetic waves received by the antenna 31 when a human body moves in a dwelling unit 90 (see FIG. 2). And the intruder feature storage unit 32 storing the duration as the intruder feature, the amount of change in the intensity of the electromagnetic wave received by the antenna 31, and the duration and the change in the intensity of the electromagnetic wave stored by the intruder feature storage unit 32. An intruder detection unit 33 as a human body detection unit that detects the presence or absence of an intruder based on the amount and duration, and a warning unit 34 as a warning unit that performs a warning based on a determination result by the intruder detection unit 33 I have.

  The intruder detection unit 33 compares the amount and duration of the electromagnetic wave intensity change received by the antenna 31 with the amount of electromagnetic wave intensity change and the duration time stored by the intruder feature storage unit 32. When a similarity greater than or equal to a predetermined value is obtained, it is determined that there is an intruder, and the computer operates with human body detection software.

  Next, the operation of the intruder detection system 10 will be described.

  The resident of the dwelling unit 90 instructs the wireless communication device 20 to switch from the communication mode to the human body detection mode when going out.

  Upon receiving an instruction from a resident of the dwelling unit 90, the wireless communication device 20 is switched from the communication mode to the human body detection mode by the mode switching unit 23, and transmits an activation signal to the intruder detection device 30.

  The intruder detection device 30 receives the activation signal from the wireless communication device 20 and starts the operation shown in FIG. 6. The intruder detection device 30 counts the channels in which the presence / absence of the intruder is not determined among the empty channels of the wireless LAN. Then, a detection counter K that counts the number of times that an intruder is detected and a time interval counter T that counts a time interval for determining whether or not there is an intruder are initialized to start the current detection process (S61). . In the initial setting of S61, the intruder detection device 30 sets the number a of empty channels among the wireless LAN channels to the value of the channel counter A, and sets the values of the detection counter K and the time interval counter T to 0.

  Next, the intruder detection device 30 determines whether or not the value of the channel counter A is 0 (S62).

  When the intruder detection device 30 determines in S62 that the value of the channel counter A is not 0, the intruder detection device 30 selects one channel for which the presence or absence of an intruder has not been determined in the current detection process, and the channel counter A 1 is subtracted from the value (S63).

  Next, the intruder detection device 30 determines the amount and duration of the electromagnetic wave intensity change received by the antenna 31 and the electromagnetic wave intensity change amount stored by the intruder feature storage unit 32 and the channel selected in S63. Based on the duration, the intruder detection unit 33 determines whether there is an intruder (S64). That is, the human body can be detected when the time interval between the electric field changes of the plurality of times corresponds to the movement time of the person (about 3 km / hour).

  When the intruder detection device 30 determines that there is an intruder in S64, the intruder detection device 30 adds 1 to the value of the detection counter K (S65), and determines whether or not the value of the time interval counter T is equal to or greater than a predetermined time t. Judgment is made (S66).

  On the other hand, when the intruder detection device 30 determines in S64 that there is no intruder, the intruder detection device 30 determines whether or not the value of the time interval counter T is equal to or greater than the time t without changing the value of the detection counter K (S66). .

The intruder detecting device 30, the value of the time interval counter T is determined in S66 if not equal to or greater than time t, by adding the time t ₀ to the value of the time interval counter T (S67), the processing of S62 Run again. Here, t ₀ is the elapsed time from the start in the first S 67 after the start of the operation shown in FIG. 6, and is the elapsed time from the previous S 67 in the second and subsequent S 67.

  When the intruder detection device 30 determines in S62 that the value of the channel counter A is 0, or in S66 that the value of the time interval counter T is equal to or greater than the time t, the value of the detection counter K is predetermined. It is determined whether or not the number of times is equal to or greater than k (S68).

  If the intruder detection device 30 determines in S68 that the value of the detection counter K is equal to or greater than the predetermined number k, it issues a warning (S69) and ends the processing shown in FIG. The intruder detection device 30 performs the warning in S69 by a method set in advance. For example, the intruder detection device 30 issues a warning in S <b> 69 by notifying the resident that there is an intruder via a communication device such as a mobile phone or generating a warning sound in the dwelling unit 90.

  On the other hand, if the intruder detection device 30 determines in S68 that the value of the detection counter K is not equal to or greater than the predetermined number k, the intruder detection device 30 ends the current detection process and executes the process of S61 again.

  Note that the intruder detection device 30 performs a predetermined time when the presence / absence of an intruder is determined for all vacant channels of the wireless LAN in the operation shown in FIG. It is determined whether or not to give a warning using the one that occurred earlier when t is reached, as an opportunity, but it is determined whether or not to give a warning using each as an opportunity. A warning may be provided with a level such as “caution” when it is determined that a warning is to be performed, and “danger” when both are determined to be warned.

  As described above, since the intruder detection system 10 can warn a resident who is out when there is an intruder in the dwelling unit 90, the intruder detection system 10 can realize the safety and security of the resident of the dwelling unit 90. it can.

  For example, in the dwelling unit 90 shown in FIG. 2, when an intruder returns from the entrance 90a along the paths 91, 92, 93, and 94 to the entrance 90a again via the 6 tatami mat 90b, the 8 tatami mat 90c, and the kitchen 90d, The electromagnetic wave received by the antenna 31 is disturbed due to the movement of the intruder, and the intensity changes as shown in FIG. Here, the time zone in which the intensity of the electromagnetic wave changes sharply is the time zone in which the intruder is moving. The intruder detection system 10 can determine that there is an intruder in the dwelling unit 90 when the intensity of the electromagnetic wave changes sharply, and can warn a resident who is out.

  Further, the intruder detection system 10 detects an intruder by using electromagnetic waves generated by the wireless communication device 20 instead of unstable electromagnetic waves such as infrared rays and television radio waves generated by the intruder. It is possible to improve the stability of detection of an intruder existing in 90 than before. Moreover, since the intruder detection system 10 can be realized with a simple configuration, it can be realized at a lower cost than in the past.

  When the resident of the dwelling unit 90 is out, the wireless LAN in the dwelling unit 90 is unlikely to be used as a transmission path that is the original role. The intruder detection system 10 can effectively use the wireless communication device 20 constituting the wireless LAN when the wireless LAN is not used as a transmission path.

  Since the intruder detection system 10 uses a plurality of channels having different frequencies for intruder detection, the intruder detection accuracy is improved as compared with the case where only one channel is used for intruder detection. be able to.

  The intruder detection system 10 can detect a movement of about 8.3 cm or less of an intruder moving at a speed of 3 km / h if the time t is set to 100 ms or less. Can be detected. In particular, the intruder detection system 10 can detect a movement of about 1.7 cm of an intruder moving at a speed of 3 km / h if the time t is 20 ms.

  If the intruder detection system 10 detects an intruder at a time t of 100 ms and then detects the intruder again at a time t of 20 ms, the intruder detection is compared with the case where the intruder is not detected step by step. Thus, the accuracy of intruder detection can be improved.

  Further, the intruder detection system 10 may use an electromagnetic wave having a legally permitted frequency in the 2.4 GHz band or the 5 GHz band as the electromagnetic wave to be used. Furthermore, if the intruder detection system 10 uses an electromagnetic wave having a frequency of 5 GHz and intermittently transmitted and having a transmission duration of less than 4 ms, it is not necessary to obtain a legal use permission. So good.

  Intruder detection system 10 is installed in dwelling unit 90 as a dedicated device in the present embodiment, but may be installed in dwelling unit 90 by being incorporated in a home appliance such as a television.

  Since the human body and the body of an animal other than a human have different dielectric constants, even if the human and the animal move in the same way, the change in the electric field of the electromagnetic wave is different. Therefore, the intruder detection unit 33 may distinguish between a human body and a body of an animal other than a human by changing the electric field of electromagnetic waves. With this configuration, the intruder detection system 10 can prevent an animal body such as a pet from being erroneously detected as a human body.

(Second Embodiment)
First, the configuration of an intruder detection system as a human body detection system according to a second embodiment of the present invention will be described.

  As shown in FIG. 8, the intruder detection system 100 according to the present embodiment includes a terminal 110 a installed in a dwelling unit 191 on the first floor of a four-story condominium 190 and a dwelling unit 192 on the second floor of the condominium 190. A terminal 110b installed in the apartment 190, a terminal 110c installed in the dwelling unit 193 on the third floor of the apartment 190, and an access point 120 installed on the roof of the apartment 190 and communicating with the terminals 110a, 110b, 110c. Yes.

  The terminals 110a, 110b, and 110c are a wireless communication device (not shown) similar to the wireless communication device 20 (see FIG. 1) according to the first embodiment, and an intruder detection device according to the first embodiment. 30 (see FIG. 1), and an intruder detection device (not shown).

  The terminals 110a, 110b, and 110c detect an intruder by changing the electric field of electromagnetic waves in the channels a, b, and c, respectively.

  Next, the operation of the intruder detection system 100 will be described.

  For example, when the terminal 110a detects an intruder, the access point 120 determines the area where the intruder is detected as the area where the terminal 110a using the channel a where the intruder is detected, that is, the dwelling unit 191. judge.

(Third embodiment)
First, the configuration of an intruder detection system as a human body detection system according to a third embodiment of the present invention will be described.

  The configuration of the intruder detection system according to the present embodiment is substantially the same as the configuration of the intruder detection system 100 (see FIG. 8) according to the second embodiment. Therefore, about the structure similar to the structure of the intruder detection system 100 among the structures of the intruder detection system which concerns on this Embodiment, the code | symbol same as the structure of the intruder detection system 100 is attached | subjected and description is abbreviate | omitted.

  The terminals 110a, 110b, and 110c are configured to detect an intruder by changing the electric field of the electromagnetic wave in the same channel a. However, as shown in FIG. It is designed to detect intruders.

The pattern is adjusted by the signal width t ₂ and the signal interval t ₃ at the predetermined time t ₁ .

Pattern of the terminal 110a, as shown in FIG. 9 (a), the number of transmissions at time _{t 1} is three times of the pattern. Pattern of the terminal 110b, as shown in FIG. 9 (b), the number of transmissions at time _{t 1} is 4 times of the pattern. Pattern of the terminal 110c, as shown in FIG. 9 (c), a pattern number of transmissions five at time _{t 1.}

  Next, the operation of the intruder detection system according to the present embodiment will be described.

For example, the terminal 110a detects an intruder, information that was detected intruder is transmitted three times in the time t ₁ to the access point 120 from the terminal 110a. Therefore, area access point 120, the intruder is detected area, intruder is detected pattern, i.e., the terminal 110a which has detected the intruder pattern of 3 times at time t ₁ is installed, That is, it is determined as a dwelling unit 191.

The block diagram which shows the structure of the intruder detection system which concerns on the 1st Embodiment of this invention Floor plan of a dwelling unit with the intruder detection system shown in FIG. The figure which shows an example of the channel used in the intruder detection system shown in FIG. The block diagram which shows the structure of the radio | wireless communication apparatus of the intruder detection system shown in FIG. The block diagram which shows the structure of the intruder detection apparatus of the intruder detection system shown in FIG. The flowchart which shows operation | movement of the intruder detection apparatus shown in FIG. The figure which shows an example of the change of the electric field strength of the electromagnetic wave received by the intruder detection apparatus shown in FIG. 5 when an intruder moves in the dwelling unit shown in FIG. Front view of the apartment where the intruder detection system according to the second embodiment of the present invention is installed (A) The figure which shows the pattern of the electromagnetic wave transmitted by the terminal installed in the dwelling unit in the 1st floor of a condominium among the terminals of the intruder detection system which concerns on the 3rd Embodiment of this invention (b) The figure which shows the pattern of the electromagnetic wave transmitted by the terminal installed in the dwelling unit in the second floor of an apartment among the terminals of the intruder detection system which concerns on 3rd Embodiment (c) 3rd Embodiment of this invention The figure which shows the pattern of the electromagnetic waves transmitted by the terminal installed in the dwelling unit in the 3rd floor of an apartment among the terminals of the intruder detection system which concerns on

Explanation of symbols

10 Intruder detection system (human body detection system)
20 Wireless communication device (electromagnetic wave generator)
21 antenna 22 communication unit 23 mode switching unit (mode switching means)
30 Intruder detection device (human body detection device)
31 Antenna 32 Intruder feature storage unit 33 Intruder detection unit (human body detection means)
34 Warning part (Warning means)
100 Intruder detection system (human body detection system)
110a, 110b, 110c Terminal 120 Access point

Claims (15)

An electromagnetic wave generator for generating electromagnetic waves, and a human body detection device for detecting the presence or absence of a human body,
The human body detection device includes a human body detection unit that performs the detection by a change in the electric field of the electromagnetic wave, and a warning unit that issues a warning when the human body is detected by the human body detection unit. system.   2. The human body detection system according to claim 1, wherein the human body detection unit performs the detection based on an electric field change of the electromagnetic wave having a frequency of 2.4 GHz band or 5 GHz band.   The said human body detection means performs the said detection by the electric field change of the said electromagnetic wave whose frequency is a 5 GHz band and is transmitted intermittently and the transmission duration of one time is less than 4 ms. Human body detection system.   The electromagnetic wave generation device is a wireless communication device including a mode switching unit that switches between a communication mode in which communication is performed using the electromagnetic wave and a human body detection mode in which the human body detection device performs the detection using the electromagnetic wave. The human body detection system according to claim 1.   5. The human body detection system according to claim 4, wherein the human body detection unit performs the detection based on an electric field change of the electromagnetic wave in an empty channel among the channels for the communication.   5. The human body detection according to claim 4, wherein the human body detection unit performs the detection based on a change in the electric field of the electromagnetic wave in the channel for communication, and switches the channel used for the detection every predetermined time. system.   5. The human body detection system according to claim 4, wherein the human body detection unit performs the detection by an electric field change of the electromagnetic wave that is intermittently transmitted and has a transmission interval of 100 ms or less.   The human body detection system according to claim 7, wherein the transmission interval is 20 ms.   The human body detection system according to claim 1, wherein the human body detection unit performs the detection based on a time interval of the electric field change a plurality of times.   The human body detection means performs the detection based on the electric field change of the electromagnetic wave transmitted intermittently, and the detection is performed based on the electric field change of the electromagnetic wave having a transmission interval shorter than that of the electromagnetic wave detected when detecting the human body. 5. The human body detection system according to claim 4, wherein the human body detection system is performed again. A plurality of terminals, and an access point for communicating with the terminals,
The terminal includes an electromagnetic wave generating device that generates an electromagnetic wave, and a human body detecting device that detects a human body,
The human body detection device includes a human body detection unit that performs the detection by changing the electric field of the electromagnetic wave, and a warning unit that issues a warning when the human body is detected by the human body detection unit,
The electromagnetic wave generation device is a wireless communication device including a mode switching unit that switches between a communication mode in which communication is performed using the electromagnetic wave and a human body detection mode in which the human body detection device performs the detection using the electromagnetic wave. ,
The human body detection means performs the detection by changing the electric field of the electromagnetic wave in an empty channel among the channels for the communication,
The plurality of terminals perform the detection by changing the electric field of the electromagnetic wave in each of the empty channels,
6. The human body according to claim 5, wherein the access point determines an area where the human body is detected as an area where the terminal using the empty channel where the human body is detected is installed. Detection system. A plurality of terminals, and an access point for communicating with the terminals,
The terminal includes an electromagnetic wave generating device that generates an electromagnetic wave, and a human body detecting device that detects a human body,
The human body detection device includes a human body detection unit that performs the detection by changing the electric field of the electromagnetic wave, and a warning unit that issues a warning when the human body is detected by the human body detection unit,
The electromagnetic wave generation device is a wireless communication device including a mode switching unit that switches between a communication mode in which communication is performed using the electromagnetic wave and a human body detection mode in which the human body detection device performs the detection using the electromagnetic wave. ,
The human body detection means performs the detection by changing the electric field of the electromagnetic wave in an empty channel among the channels for the communication,
The plurality of terminals perform the detection by changing the electric field of the electromagnetic wave transmitted in a separate pattern,
6. The access point according to claim 5, wherein the access point determines an area where the human body is detected as an area where the terminal performing the detection in the pattern where the human body is detected. Human body detection system.   The human body detection system according to claim 11, wherein the separate patterns are patterns having different numbers of transmissions in a predetermined time.   2. The human body detection system according to claim 1, wherein the human body detection unit distinguishes the human body from a body of an animal other than a human by changing the electric field of the electromagnetic wave. A human body detection method comprising: generating an electromagnetic wave; detecting presence / absence of a human body by a change in an electric field of the electromagnetic wave; and performing a warning when the human body is detected.

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