JP6240967B2 - Detection system and detection method - Google Patents

Description

  The present invention relates to a detection system and a detection method, and more particularly to a detection system for detecting that a moving body has approached an exit of a predetermined space.

  In recent years, with the increase of elderly people, the management of patients or residents in hospitals, nursing homes or nursing homes has become a problem. Such residents include patients with dementia, who may go out of the facility without permission due to wandering and may be missing.

  On the other hand, in order to prevent wrinkles outside the hospital, a technique using an RFID tag is known (for example, see Patent Document 1).

  A technique using a Bluetooth transmitter is known to prevent wrinkles (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 2005-215961 JP 2013-143123 A

  However, the technique using the RFID tag has a problem that the detection range of the RFID is narrow. Thus, for example, when a receiver is provided at the entrance and exit of a facility and RFID is detected, if the width of the entrance and exit is wide, all the patients who pass through the entrance and exit are simply provided with receivers at both ends of the entrance and exit It may not be detected. This can be solved by providing a receiver near the center of the doorway, but in this case, the number of receivers increases, and these receivers may obstruct traffic.

  On the other hand, when a wireless signal having a detection range wider than that of the RFID is used, the detection range varies depending on the transmission state of the wireless signal. Thereby, there exists a subject that a highly accurate detection cannot be performed.

  Then, an object of this invention is to provide the detection system or detection method which can implement | achieve highly accurate detection.

  In order to achieve the above object, a detection system according to one aspect of the present invention is a detection system for detecting that a moving body approaches an exit or an entrance of a predetermined space, and the moving body includes: A detection receiver for detecting that the exit or entrance is approached, a first reference receiver for assisting in detecting that the mobile body has approached the exit or entrance, and a mobile body. A transmitter that wirelessly transmits a detection signal, and the detection receiver is a region in the vicinity of the outlet or the inlet including the outlet or the inlet, and is a detection target of the entrance of the moving body. The detection signal is disposed within a region and receives the detection signal. The first reference receiver is disposed outside the first region and receives the detection signal. The detection system includes the detection signal. The detection signal received by the receiver. The mobile body has entered the first region based on the first radio wave intensity which is the received radio wave intensity and the second radio wave intensity which is the received radio wave intensity of the detection signal received by the first reference receiver. It is determined whether or not.

  According to this configuration, the detection system moves based on the first radio wave intensity at the detection receiver arranged near the exit or the entrance and the second radio wave intensity at the reference receiver arranged in another area. It can be determined whether the body has entered the first region. Thereby, the said detection system can implement | achieve highly accurate detection.

  For example, the detection system determines whether a first multiplication value obtained by multiplying the second radio wave intensity by a predetermined first coefficient is equal to or lower than the first radio wave intensity, and the first multiplication value is When the intensity is less than or equal to the first radio wave intensity, it may be determined that the moving body has entered the first region.

  According to this configuration, since it is possible to determine whether the moving body has entered the first region based on the ratio between the first radio wave intensity and the second radio wave intensity, it is possible to realize highly accurate detection independent of the state of the transmitter. .

  For example, the detection system further determines whether a second multiplication value obtained by multiplying the second radio wave intensity by a predetermined second coefficient smaller than the first coefficient is equal to or less than the first radio wave intensity. However, when the second multiplication value is less than or equal to the first radio field intensity, it may be determined that the moving body has entered a second area around the first area.

  According to this structure, the said detection system can implement | achieve the approach determination to a some area | region with high precision.

  For example, each of the detection receiver and the first reference receiver detects that the moving body has approached the outlet or the inlet, and detects that the moving body has approached the outlet or the inlet. May be used to assist.

  According to this structure, the said detection system can implement | achieve the approach determination to a some area | region with high precision. Also, a plurality of receivers may be used as receivers for detecting that the moving body has approached the outlet or the entrance, and as receivers for assisting in detecting that the moving body has approached the exit or the entrance. By using it, the number of receivers can be reduced, so that the cost can be reduced.

  For example, the first reference receiver is disposed in a second region around the first region, and the detection system further assists in detecting that the moving body has approached the outlet or the inlet. A second reference receiver for receiving the detection signal, wherein the second reference receiver is disposed outside the first region and the second region, and the detection system further includes: The mobile body enters the second region based on the first radio wave intensity, the second radio wave intensity, and the third radio wave intensity that is the received radio wave intensity of the detection signal received by the second reference receiver. It may be determined whether or not.

  According to this structure, the said detection system can implement | achieve the approach determination to a some area | region with high precision.

  For example, in the detection system, the first multiplication value is greater than the first radio wave intensity, and the first radio wave intensity or the second radio wave intensity is received by the second reference receiver. If the received signal strength of the signal is greater than a third multiplied value obtained by multiplying the third received signal strength by a predetermined third coefficient, it is determined that the mobile object has entered the second region. Also good.

  According to this structure, the said detection system can implement | achieve the approach determination to a some area | region with high precision.

  For example, when the detection system further determines that the moving body has entered the second area, the detection system issues a first warning, and when it is determined that the moving body has entered the first area, A second warning stronger than the warning may be issued.

  According to this configuration, the detection system can issue a different warning depending on the degree of approach of the exit or entrance of the moving body.

  For example, the detection system may further estimate the moving direction of the moving body based on temporal changes in the first radio wave intensity and the second radio wave intensity.

  According to this configuration, the detection system can detect the moving direction of the moving body.

  For example, the detection system may further determine whether the moving body has passed through the outlet or the entrance based on a temporal change in the first radio wave intensity and the second radio wave intensity.

  According to this structure, the said detection system can detect whether the mobile body passed the exit or the entrance.

  For example, the detection system determines whether the first radio field intensity is equal to or higher than a predetermined first threshold and the second radio field intensity is less than a predetermined second threshold, When the radio wave intensity is equal to or higher than the first threshold value and the second radio wave intensity is lower than the second threshold value, it may be determined that the mobile object has entered the first area.

  According to this configuration, highly accurate detection can be realized based on the first radio wave intensity and the second radio wave intensity.

  For example, the moving body may be a person and the space may be a building.

  For example, the space is a building having a plurality of floors, the exit or entrance and the detection receiver are on the same floor, and the first reference receiver is different from the exit or entrance and the detection receiver. May be present.

  According to this structure, the said detection system can reduce the influence of the transmitter which exists in a different floor.

  In addition, the detection method according to the embodiment is a detection method in a detection system for detecting that the moving body has approached an exit or entrance of a predetermined space, and the detection system includes: A detection receiver for detecting that the exit or entrance is approached, a first reference receiver for assisting in detecting that the mobile body has approached the exit or entrance, and a mobile body. A transmitter that wirelessly transmits a detection signal, and the detection receiver is a region in the vicinity of the outlet or the inlet including the outlet or the inlet, and is a detection target of the entrance of the moving body. The detection signal is disposed within a region and receives the detection signal, the first reference receiver is disposed outside the first region and receives the detection signal, and the detection method includes the detection signal The detection received at the receiver The mobile body enters the first region based on a first radio wave intensity that is a received radio wave intensity of a signal and a second radio wave intensity that is a received radio wave intensity of the detection signal received by the first reference receiver. Determine whether or not.

  According to this, the detection method is based on the first radio wave intensity in the detection receiver arranged in the vicinity of the exit or the entrance and the second radio wave intensity in the reference receiver arranged in another area. It can be determined whether or not has entered the first region. Thereby, the said detection method can implement | achieve highly accurate detection.

  These general or specific aspects may be realized by a system, a method, an integrated circuit, a computer program, or a recording medium such as a computer-readable CD-ROM. The system, method, integrated circuit, computer program Also, any combination of recording media may be realized.

  The present invention can provide a detection system or a detection method that can realize highly accurate detection.

FIG. 1A is a diagram for explaining a problem of the detection system. FIG. 1B is a diagram for explaining the problem of the detection system. FIG. 2 is a diagram illustrating a configuration of the detection system according to the embodiment. FIG. 3 is a block diagram showing a configuration of the transmitter according to the embodiment. FIG. 4 is a diagram illustrating a configuration of a detection signal according to the embodiment. FIG. 5 is a diagram illustrating a configuration of the receiver according to the embodiment. FIG. 6 is a diagram illustrating a configuration of a notification signal according to the embodiment. FIG. 7 is a diagram illustrating a configuration of the management apparatus according to the embodiment. FIG. 8 is a flowchart of the determination process according to the embodiment. FIG. 9 is a diagram for explaining the determination processing according to the embodiment. FIG. 10 is a diagram for explaining the determination processing according to the embodiment. FIG. 11 is a diagram for explaining the determination processing according to the embodiment. FIG. 12 is a flowchart of a modified example of the determination process according to the embodiment. FIG. 13 is a diagram illustrating a configuration of a modified example of the detection system according to the embodiment. FIG. 14 is a diagram illustrating a configuration of a modified example of the detection system according to the embodiment. FIG. 15 is a flowchart of a modified example of the determination process according to the embodiment. FIG. 16 is a diagram illustrating a configuration of a modified example of the detection system according to the embodiment. FIG. 17 is a diagram illustrating a configuration of a modified example of the detection system according to the embodiment. FIG. 18 is a diagram illustrating a configuration of a modified example of the detection system according to the embodiment. FIG. 19 is a diagram illustrating an example of a coefficient setting screen according to the embodiment.

  First, a problem when a wireless signal having a detection range wider than that of the RFID is used will be described.

  1A and 1B are diagrams for comparison and show the problem of the present invention. In FIG. 1A and FIG. 1B, the detection receiver 102 is installed around the doorway 106 in the building 105. The transmitter 101 is carried or worn by the monitoring subject.

  In this system, when the detection receiver 102 receives a wireless signal transmitted from the transmitter 101, it is considered that the person to be monitored has entered the alarm area 107 and issues an alarm.

  Here, the reception range of the radio signal transmitted from the transmitter 101 varies greatly depending on the state of the transmitter 101. For example, when the transmitter 101 is a bracelet type or the like worn on the arm of the person to be monitored and the transmitter 101 is not covered, the reception range is widened as shown in FIG. 1A. On the other hand, when the transmitter 101 is put in the pocket or when the person to be monitored covers the transmitter 101 by hand, the reception range is narrowed as shown in FIG. 1B. As a result, the range of the alarm area 107 varies greatly depending on the state of the transmitter 101.

  Hereinafter, embodiments will be specifically described with reference to the drawings.

  Note that each of the embodiments described below shows a specific example of the present invention. The numerical values, shapes, materials, constituent elements, arrangement positions and connecting forms of the constituent elements, steps, order of steps, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements.

  In the detection system according to the embodiment of the present invention, it is determined whether or not the transmitter has approached the entrance / exit by using the received radio wave intensity at the reference receiver in addition to the receiver disposed near the entrance / exit. Thereby, highly accurate detection is realizable irrespective of the state of a receiver.

  First, the configuration of the detection system 100 according to the present embodiment will be described. FIG. 2 is a diagram illustrating a configuration of the detection system 100 according to the present embodiment.

  This detection system 100 is a system for detecting that the subject has approached the entrance 106 of a predetermined space. For example, the detection system 100 is a system for detecting that a patient or a resident in a building 105 such as a hospital, a nursing facility, a nursing facility, or the like goes out of the building 105 without permission. The entrance / exit 106 may have both an exit and an entrance function, or may have only one of the functions.

  In the following description, the entrance / exit 106 of the building 105 will be described as an example. However, the monitoring target area may be an entrance / exit of an arbitrary space (area). That is, when the moving body passes through the doorway 106, the outside of the moving body enters or leaves a predetermined space. For example, the area to be monitored may be an entrance / exit (gate) of a site such as a facility, or an entrance / exit of a park or the like.

  The detection system 100 includes a transmitter 101, a detection receiver 102, a reference receiver 103, and a management device 104.

  The transmitter 101 is held (carried or worn) by a person to be monitored (for example, a patient). For example, the transmitter 101 is a bracelet type (watch type) worn on the arm of the monitoring subject, a necklace type hanging on the neck of the monitoring subject, or the like. Alternatively, the transmitter 101 may be a name tag type or the like. In FIG. 2, only one transmitter 101 is illustrated for simplicity of explanation, but the detection system 100 may include a plurality of transmitters 101 held by a plurality of monitoring subjects.

  This transmitter 101 periodically transmits a detection signal 111 by radio. The radio signal used in this radio transmission is, for example, a radio signal conforming to IEEE 802.15.4, for example, a 2.4 GHz band, a 920 MHz band, or a 950 MHz band radio signal. That is, the wireless signal used in the detection system 100 is a wireless signal having a relatively narrow wireless communication range (for example, about 200 to 300 m). Note that other wireless signals such as Bluetooth (registered trademark) may be used. Further, the transmitter 101 may transmit any one of the above-described types of radio signals, or may transmit a plurality of types of radio signals simultaneously or in time division.

  The detection receiver 102 is used to detect that the subject has approached the doorway 106. The detection receiver 102 is disposed in the vicinity of the entrance 106 of the building 105. Specifically, the detection receiver 102 is disposed in the alarm area 107. The warning area 107 (first area) and the warning area 108 (second area) are areas in the building 105 and are areas to be detected for the entry of the target person. The alarm area 107 is an area in the vicinity of the doorway 106 including the doorway 106. The alert area 108 is an area around the alert area 107.

  The reference receiver 103 is used to assist in detecting that the subject has approached the doorway 106. Specifically, the reference receiver 103 is used to invalidate the detection that the subject has approached the entrance 106 or to improve the detection accuracy. The reference receiver 103 is disposed on the inner side of the building 105 with respect to the entrance 106. Specifically, the reference receiver 103 is disposed inside the building 105 and outside the warning area 107 and the warning area 108.

  The detection receiver 102 and the reference receiver 103 receive the detection signal 111 transmitted from the transmitter 101. Further, when receiving the detection signal 111, the detection receiver 102 and the reference receiver 103 transmit a notification signal 112 to the management apparatus 104.

  In FIG. 2, two detection receivers 102 arranged at both ends of the entrance / exit 106 are shown, but the number of the detection receivers 102 may be arbitrary, and only one detection receiver 102 is arranged. Alternatively, three or more detection receivers 102 may be arranged. In FIG. 2, only one reference receiver 103 is illustrated, but a plurality of reference receivers 103 may be arranged. In addition, all of the plurality of reference receivers 103 are not necessarily arranged in the building 105, and some or all of the plurality of reference receivers 103 may be arranged outside the building 105. Similarly, some or all of the plurality of detection receivers 102 may be arranged outside the building 105.

  In addition, transmission of the notification signal 112 from the detection receiver 102 and the reference receiver 103 to the management apparatus 104 may be performed by any method, and may be performed by any method of wired or wireless. In addition, the notification signal 112 may be transmitted directly from the detection receiver 102 and the reference receiver 103 to the management apparatus 104, or may be transmitted via another device. For example, the other detection receiver 102 or the other reference receiver 103 has a relay function, and the notification signal 112 is transmitted to the management apparatus 104 via the other detection receiver 102 or the other reference receiver 103. Also good.

  The management device 104 is, for example, a PC (personal computer) installed in the building 105. The management device 104 receives the notification signal 112 transmitted from the detection receiver 102 and the reference receiver 103, and uses the information included in the notification signal 112, so that the person to be monitored enters the warning area 107 or the warning area 108. Detect if you did. The installation location of the management device 104 may be arbitrary and may be outside the building 105. The management device 104 may be a mobile terminal or the like.

  FIG. 3 is a block diagram of the transmitter 101. The transmitter 101 includes a transmitter ID storage unit 121, a wireless transmission unit 122, and a power supply unit 123.

  The transmitter ID storage unit 121 stores a transmitter ID (transmitter identifier) 161A which is information for uniquely specifying the transmitter 101.

  The wireless transmission unit 122 periodically wirelessly transmits the detection signal 111.

  The power supply unit 123 is a power supply that supplies power to the transmitter 101, and is, for example, a battery or a battery. In other words, the transmitter 101 can be operated only by power supply from the inside (or power generated inside) without receiving power from the outside.

  FIG. 4 is a diagram showing the configuration of the detection signal 111. As shown in FIG. 4, the detection signal 111 includes a transmitter ID 161 </ b> B for identifying a transmission source transmitter that is the transmission source transmitter 101 of the detection signal 111.

  The transmitter ID 161B is set in advance and is the same as the transmitter ID 161A stored in the transmitter ID storage unit 121 of the transmitter 101.

  FIG. 5 is a block diagram illustrating a configuration of the detection receiver 102. The configuration of the reference receiver 103 is the same as that of the detection receiver 102. The detection receiver 102 includes a wireless reception unit 131, a reception intensity measurement unit 132, a notification signal generation unit 133, and a transmission unit 134.

  The wireless reception unit 131 receives the detection signal 111 wirelessly transmitted from the transmitter 101. The reception intensity measurement unit 132 measures the reception radio wave intensity of the detection signal 111 received by the wireless reception unit 131.

  The notification signal generation unit 133 generates the notification signal 112 when the detection signal 111 is received. The transmission unit 134 transmits the notification signal 112 to the management device 104.

  Note that the function of the detection receiver 102 may be realized by a plurality of devices obtained by dividing the function by function or signal processing.

  FIG. 6 is a diagram illustrating the configuration of the notification signal 112. As shown in FIG. 6, the notification signal 112 includes a transmitter ID 161 </ b> C, a receiver ID 162, and received radio wave intensity information 163.

  The transmitter ID 161C indicates the transmitter 101 that is the transmission source of the detection signal 111. For example, the transmitter ID 161C is the same ID as the transmitter ID 161B included in the detection signal 111.

  The receiver ID 162 is the detection receiver 102 or the reference receiver 103 that has received the detection signal 111, and indicates the detection receiver 102 or the reference receiver 103 that is the transmission source of the notification signal 112.

  The reception radio wave intensity information 163 indicates the reception radio wave intensity of the detection signal 111 received by the detection receiver 102 or the reference receiver 103.

  Note that the notification signal 112 may include information other than the above. For example, the notification signal 112 may include information indicating the time when the detection signal 111 is received.

  In addition, the detection receiver 102 or the reference receiver 103 does not transmit the notification signal 112 only during the period in which the detection signal 111 is received. You may transmit the notification signal 112 which shows that the signal 111 was not received.

  FIG. 7 is a block diagram illustrating a configuration of the management apparatus 104. The management device 104 includes a receiving unit 141, a control unit 142, an input unit 143, and a display unit 144.

  The receiving unit 141 receives the notification signal 112 transmitted from the detection receiver 102 or the reference receiver 103.

  The control unit 142 determines whether the transmitter 101 has entered the warning area 107 or the warning area 108 using the received radio wave intensity information 163 included in the notification signal 112.

  The input unit 143 receives an input operation by a user (administrator).

  The display unit 144 displays alarms and warning information.

  Note that the function of the management apparatus 104 may be realized by a plurality of devices. For example, a part of the function of the management apparatus 104 may be realized by a PC, and the other part may be realized by a smartphone carried by a staff member.

  In the above description, the detection receiver 102, the reference receiver 103, and the management device 104 are individually described. However, the detection receiver 102 or the reference receiver 103 and the management device 104 are configured as a single device. May be. In other words, at least one of the detection receiver 102 and the reference receiver 103 may have at least a partial function of the management device 104. That is, the function of the management device 104 may be realized by one or a plurality of arbitrary devices included in the detection system 100.

  Hereinafter, a process of determining whether the transmitter 101 has entered the alarm area 107 or the warning area 108 by the management apparatus 104 will be described. If there are a plurality of transmitters 101, the following processing is performed for each transmitter 101.

  FIG. 8 is a flowchart of determination processing by the management apparatus 104. For example, the process shown in FIG. 8 is repeatedly executed based on the latest notification signal 112 at a predetermined cycle.

  9 to 11 are diagrams showing examples of received radio wave intensity in each state. 9 shows a case where the transmitter 101 has not entered either the alarm area 107 or the alert area 108, FIG. 10 shows a case where the transmitter 101 has entered the alert area 108, and FIG. The case where the device 101 enters the alarm area 107 is shown.

  Hereinafter, the received radio wave intensity of the detection signal 111 received by the detection receiver 102 is referred to as target radio wave intensity (first radio wave intensity). When there are a plurality of detection receivers 102, the target radio wave intensity may be an average value of the reception radio wave intensity of the plurality of detection receivers 102, or may be a maximum value or a minimum value. Further, the average value, the maximum value, or the minimum value may be determined based on the received radio wave intensity excluding the received radio wave intensity indicating an abnormal value. Here, the abnormal value is a value outside a predetermined range, or a value that is different from other received radio wave intensity or an average value by a predetermined value or more. Further, the received radio wave intensity of the detection signal 111 received by the reference receiver 103 is referred to as a reference radio wave intensity (second radio wave intensity). Further, when there are a plurality of reference receivers 103, the second radio wave intensity may be calculated by a method similar to the method for the detection receiver 102.

  As described above, the received radio wave intensity varies depending on the state of the transmitter 101. 9 to 11 show the assumed maximum received radio wave intensity and the minimum received radio wave intensity, respectively.

  The management device 104 determines whether or not the target person (transmitter 101) has entered the alarm area 107 (whether or not the target person exists in the alarm area 107) based on the target radio wave intensity and the reference radio wave intensity. To do. Further, the management device 104 determines whether or not the subject has entered the alert area 108 (whether or not the subject exists in the alert area 108) based on the target radio wave intensity and the reference radio wave intensity.

  Specifically, the management device 104 determines whether the target radio wave intensity is greater than or equal to a threshold value (S101). Here, the threshold value corresponds to the assumed minimum received radio wave intensity of the detection receiver 102 when the transmitter 101 enters the alert area 108. Based on the example shown in FIG. 10, for example, the threshold is 25. That is, in step S101, it is determined whether or not the transmitter 101 may have entered the warning area 107 or the warning area 108.

  When the target radio wave intensity is lower (No in S101), the management apparatus 104 has not entered the alarm area 107 or the warning area 108, and the target person is not close to the entrance 106. It is determined that there is no abnormality (S106). For example, in the example of FIG. 9, the target radio wave intensity is 10 to 20, which is less than the threshold value of 25, which corresponds to this case.

  On the other hand, when the target radio wave intensity is equal to or higher than the threshold (Yes in S101), the management apparatus 104 determines whether the transmitter 101 has entered the alarm area 107 using the target radio wave intensity and the reference radio wave intensity. In the examples of FIGS. 10 and 11, the target radio wave intensity is 25 to 50 or 50 to 100, and this is the case because it is 25 or more which is a threshold value.

  Specifically, the management device 104 determines whether or not the first multiplication value obtained by multiplying the reference radio wave intensity by a predetermined coefficient α (first coefficient) is equal to or lower than the target radio wave intensity ( S102). In other words, the management apparatus 104 determines whether the ratio of the target radio wave intensity to the reference radio wave intensity is greater than a predetermined value. Based on the example shown in FIG. 11, for example, α is 2.

  Based on this determination, it is determined whether the transmitter 101 has entered the alarm area 107. For example, in the example shown in FIG. 11, when the received radio wave intensity is maximum, the target radio wave intensity (100) ≧ 2 × reference radio wave intensity (50) is satisfied. Even when the received radio wave intensity is minimum, the target radio wave intensity (50) ≧ 2 × reference radio wave intensity (25) is satisfied.

  When the value obtained by multiplying the reference radio wave intensity by the coefficient α is equal to or lower than the target radio wave intensity (Yes in S102), the management apparatus 104 determines that the transmitter 101 has entered the alarm area 107 and presents an alarm (S104). ). For example, it is displayed on the display unit 144 of the management device 104 that the target person who has the transmitter 101 has entered the alarm area 107. An alarm sound or the like may be output from the management device 104. An alarm may be presented by voice, vibration, or the like.

  Furthermore, this warning may be notified not only to the administrator and the staff, but also to the target person. For example, an alarm sound or a message may be output from the transmitter 101 or the detection receiver 102, and any method may be used, such as blinking of a light emitting unit included in the transmitter 101 or the detection receiver 102. Good. In addition, the alarm may be presented by other devices installed in the building 105 or devices owned by the target person or staff. When an alarm is presented from a device other than the management device 104, a signal indicating the alert is transmitted from the management device 104 to these devices, and each device presents an alarm based on this signal.

  On the other hand, when the first multiplication value is larger than the target radio wave intensity (No in S102), the management apparatus 104 determines whether the transmitter 101 has entered the alert area 108 using the target radio wave intensity and the reference radio wave intensity. The example of FIG. 10 corresponds to this case.

  Specifically, the management device 104 determines whether or not the second multiplication value obtained by multiplying the reference radio wave intensity by a predetermined coefficient β (second coefficient) is equal to or lower than the target radio wave intensity ( S103). In other words, the management apparatus 104 determines whether the ratio of the target radio wave intensity to the reference radio wave intensity is greater than a predetermined value. Here, the coefficient β is smaller than the coefficient α. Based on the example shown in FIG. 10, for example, β is 0.5.

  Based on this determination, it is determined whether the transmitter 101 has entered the alert area 108. For example, in the example shown in FIG. 10, when the received radio wave intensity is maximum, the target radio wave intensity (50) ≧ 0.5 × reference radio wave intensity (100) is satisfied. Even when the received radio wave intensity is minimum, the target radio wave intensity (25) ≧ 0.5 × reference radio wave intensity (50) is satisfied.

  When the second multiplication value is less than or equal to the target radio wave intensity (Yes in S103), the management device 104 determines that the transmitter 101 has entered the alert area 108 and presents alert information (S105). For example, the display unit 144 of the management device 104 displays that the target person possessing the transmitter 101 has entered the alert area 108. As a method for presenting warning information, a method similar to the method for presenting warnings described above can be used.

  However, since warning is less urgent than warning, the presentation method is generally simplified. For example, an alarm sound may be output in addition to the message at the time of alarm, and only the message may be presented at the time of alarm. Alternatively, presentation may be performed only by the management device 104 at the time of warning, and presentation by other devices such as the transmitter 101 may be performed in addition to the management device 104 at the time of warning. As described above, when the detection system 100 determines that the target person has entered the warning area 108, the detection system 100 issues a first warning, and when the target system determines that the target person has entered the warning area 107, the second warning that is stronger than the first warning. Issue a warning.

  If the second multiplication value is greater than the target radio wave intensity (No in S103), the management apparatus 104 indicates that the transmitter 101 has not entered either the warning area 107 or the warning area 108, and the target person has entered the entrance 106. It is determined that there is no abnormality because it is not close to (S106).

  As described above, in the detection system 100 according to the present embodiment, the transmitter 101 uses the received radio wave intensity of the reference receiver 103 in addition to the received radio wave intensity of the detection receiver 102 arranged near the exit. It is determined whether a predetermined area has been entered. Thereby, highly accurate detection independent of the state of the transmitter 101 can be realized.

  In the above description, an example in which one target radio wave intensity is calculated from the radio wave intensity in the plurality of detection receivers 102 when there are a plurality of detection receivers 102 is described. The above processing may be performed for each radio wave intensity. In this case, when it is determined that the subject has entered the warning area 107 or the warning area 108 based on the radio field intensity of at least one detection receiver 102, warning or warning information is presented.

  When there are a plurality of detection receivers 102 or a plurality of reference receivers 103, for example, the reference receiver 103 is set for each detection receiver 102, and the reference receiver set for each detection receiver 102 is set. The coefficients α and β are set for each 103.

  When there are a plurality of transmitters 101, the coefficients α and β may be set for each transmitter 101, or a coefficient for correcting the coefficients α or β may be set for each transmitter 101. Good. For example, a coefficient corresponding to the portable method of the transmitter 101 may be set. Examples of the portable method include a portable method in which the transmitter 101 is a bracelet type or a necklace type, and the transmitter 101 is exposed, and a portable method that is accommodated in a pocket or a bag and the transmitter 101 is not exposed. In addition, a threshold may be set for each transmitter 102 by the same method as described above.

  In the above description, the multiplication value obtained by multiplying the reference radio wave intensity by the coefficient α or β is compared with the reception radio wave intensity. However, one or more coefficients predetermined for the reference radio wave intensity are used instead of the multiplication value. A calculated value obtained by calculating may be used. Here, the calculation includes at least one of multiplication and addition (subtraction).

  In the above description, the determination is made based on the ratio between the target radio wave intensity and the reference radio wave intensity. However, as shown in FIG. 12, the determination is made based on the comparison between the target radio wave intensity, the reference radio wave intensity, and the threshold value. Also good. Hereinafter, this operation will be described.

  As shown in FIG. 12, first, the management apparatus 104 determines whether the target radio wave intensity is equal to or higher than a predetermined first threshold value and the reference radio wave intensity is lower than a predetermined second threshold value ( S111). In the example illustrated in FIGS. 9 to 11, for example, the first threshold is 50 and the second threshold is 51.

  When the target radio wave intensity is equal to or higher than the first threshold value and the reference radio wave intensity is lower than the second threshold value (Yes in S111), the management device 104 determines that the transmitter 101 has entered the alarm area 107, and generates an alarm. Is presented (S113).

  On the other hand, when the target radio wave intensity is less than the first threshold value, or when the reference radio wave intensity is equal to or higher than the second threshold value (No in S111), the management apparatus 104 determines that the target radio wave intensity is equal to or higher than a predetermined third threshold value. And it is determined whether the reference radio wave intensity is less than a predetermined fourth threshold value (S112). In the example illustrated in FIGS. 9 to 11, for example, the third threshold is 25 and the fourth threshold is 101.

  When the target radio wave intensity is greater than or equal to the third threshold and the reference radio wave intensity is less than the fourth threshold (Yes in S112), the management device 104 determines that the transmitter 101 has entered the alert area 108, and is alerted. Information is presented (S114).

  When the target radio wave intensity is less than the third threshold value or the reference radio wave intensity is greater than or equal to the fourth threshold value (No in S112), the management apparatus 104 causes the transmitter 101 to be in either the alarm area 107 or the alert area 108. Since it has not entered and the subject is not close to the entrance 106, it is determined that there is no abnormality (S115).

  In the case of this process, although the area to be detected varies depending on the state of the transmitter 101, the variation can be reduced compared to the case where the reference radio wave intensity is not used. In this process, only the determination of each received radio wave intensity and the threshold is performed, and the target radio wave intensity and the reference radio wave intensity are not compared. Therefore, the detection receiver 102 or the reference receiver 103 can compare with the threshold value. Accordingly, for example, there is an advantage that the amount of communication data can be reduced because the notification signal 112 only needs to be sent to the management apparatus 104 when the condition is satisfied.

  A plurality of reference receivers 103 may be used. For example, as shown in FIG. 13, when the warning area 107 and the warning area 108 are provided in the T-shaped passage, the two reference receivers 103 may be arranged so as to sandwich the warning area 108.

  Further, as shown in FIG. 14, the reference receiver 103A (first reference receiver) installed in the alert area 108 and the reference receiver 103B (first reference receiver) installed outside the alert area 107 and the alert area 108 2 reference receivers). In the following, the received radio wave intensity of the detection receiver 102 is referred to as target radio wave intensity (first radio wave intensity), and the received radio wave intensity of the reference receiver 103A is referred to as reference radio wave intensity A (second radio wave intensity). The received radio wave intensity of the device 103B is referred to as reference radio wave intensity B (third radio wave intensity).

  In such a case, each of the detection receiver 102 and the reference receiver 103A detects that the subject has approached the entrance 106, and assists in detecting that the subject has approached the entrance 106. Used for. The reference receiver 103 </ b> B is used to assist in detecting that the subject has approached the entrance 106.

  Further, the management device 104 determines whether the subject has entered the warning area 107 or the warning area 108 based on the target radio wave intensity, the reference radio wave intensity A, and the reference radio wave intensity B.

  In other words, the detection receiver 102 is used to detect that the subject has entered the alarm area 107, and the reference receiver 103A is used to assist in detecting that the subject has entered the alarm area 107. Used. The reference receiver 103A is used to detect that the subject has entered the alert area 108, and the detection receiver 102 and the reference receiver 103B detect that the subject has entered the alert area 108. Used to assist. As described above, the detection receiver 102 and the reference receiver 103A are used for both the detection of each region and the auxiliary of the detection. Thereby, since the number of receivers included in the system can be reduced, the cost can be reduced.

  FIG. 15 is a flowchart of determination processing by the management apparatus 104 in this case.

  First, the management apparatus 104 determines whether the relationship of target radio wave intensity> reference radio wave intensity A> reference radio wave intensity B is satisfied (S121). When the relationship of target radio wave intensity> reference radio wave intensity A> reference radio wave intensity B is satisfied (Yes in S121), the management apparatus 104 determines that the transmitter 101 has entered the alarm area 107 and presents an alarm (S123). ).

  In addition, the management apparatus 104 determines whether the relationship of target radio wave intensity <reference radio wave intensity A> reference radio wave intensity B is satisfied (S122). When the relationship of target radio wave intensity <reference radio wave intensity A> reference radio wave intensity B is satisfied (Yes in S122), the management apparatus 104 determines that the transmitter 101 has entered the alert area 108 and presents alert information ( S124).

  In addition, when both of the above two conditions are not satisfied (No in S121 and No in S122), the management apparatus 104 does not enter the alarm area 107 and the warning area 108, and the target person Since it is not close to the entrance 106, it is determined that there is no abnormality (S125).

  In step S121, the management apparatus 104 may determine whether the target radio wave intensity> reference radio wave intensity A and the target radio wave intensity> reference radio wave intensity B are satisfied instead of the above determination. Alternatively, the management device 104 may determine whether the target radio wave intensity> the reference radio wave intensity A is satisfied.

  In step S122, instead of the above determination, the management apparatus 104 may determine whether the target radio wave intensity> the reference radio wave intensity B is satisfied, or whether the reference radio wave intensity A> the reference radio wave intensity B is satisfied. May be determined.

  Further, the management device 104 may determine that the transmitter 101 exists outside the warning area 107 and the warning area 108 when the relationship of target radio wave intensity <reference radio wave intensity A <reference radio wave intensity B is satisfied. Alternatively, the management device 104 may satisfy the relationship of reference radio wave intensity A <reference radio wave intensity B, or may satisfy the relationship of reference radio wave intensity A <reference radio wave intensity B and target radio wave intensity <reference radio wave intensity B. In addition, it may be determined that the transmitter 101 exists outside the warning area 107 and the warning area 108.

  The management apparatus 104 may perform the above determination after multiplying or adding each received radio wave intensity by a coefficient corresponding to the installation location of the detection receiver 102 and the reference receivers 103A and 103B. That is, similarly to the processing shown in FIG. 8, arithmetic processing using coefficients may be performed.

  For example, in step S121, it may be determined whether the relationship of target radio wave intensity> α1 × reference radio wave intensity A> α2 × reference radio wave intensity B is satisfied. In other words, it may be determined whether the relationship of target radio wave intensity> α1 × reference radio wave intensity A and reference radio wave intensity A> α3 × reference radio wave intensity B is satisfied. Alternatively, it may be determined whether the target radio wave intensity> α1 × reference radio wave intensity A and the target radio wave intensity> α4 × reference radio wave intensity B is satisfied, or whether the target radio wave intensity> α1 × reference radio wave intensity A is satisfied. It may be determined.

  In step S122, it may be determined whether the relationship of target radio wave intensity <β1 × reference radio wave intensity A> β2 × reference radio wave intensity B is satisfied. In other words, it may be determined whether the relationship of target radio wave intensity <β1 × reference radio wave intensity A and reference radio wave intensity A> β3 × reference radio wave intensity B is satisfied. Here, β1 is a value equal to α1, for example. Alternatively, it may be determined whether or not the target radio wave intensity <β1 × reference radio wave intensity A and the target radio wave intensity> β4 × reference radio wave intensity B is satisfied. Alternatively, it may be determined whether the target radio wave intensity> β4 × reference radio wave intensity B is satisfied, or it may be determined whether the reference radio wave intensity A> β3 × reference radio wave intensity B is satisfied. Further, β3 and β4 may be equal values.

  Moreover, as shown in FIG. 16, the warning area 107 and the warning area 108 may be set, and a plurality of detection receivers 102 or a plurality of reference receivers 103A or 103B may be arranged in each area.

  Moreover, as shown in FIG. 17, the warning area | region 107 and the warning area | region 108 may be set. In this case, the detection receiver 102 is used to detect that the subject has entered a part of the warning area 107 and the warning area 108. The reference receiver 103A and the reference receiver 103D are used to assist in detecting that the subject has entered the warning area 107 and the warning area 108.

  The reference receivers 103A and 103B are used to detect that the subject has entered the alert area 108. The reference receivers 103 </ b> C and 103 </ b> D are used to assist in detecting that the target person has entered a part of the alert area 108.

  In addition, in the arrangement shown in FIG. 17, the reference receiver 103C is set so that the target person exists in a non-detection area (an area other than the warning area 107 and the warning area 108) (the target person enters the warning area 107 and the warning area 108). It may be used to detect (not doing).

  In addition, as illustrated in FIG. 18, the reference receiver 103 may be disposed on a different floor from the doorway 106. That is, the building 105 is composed of a plurality of floors, and the entrance 106 and the detection receiver 102 are on the same floor (for example, the first floor). That is, the warning area 107 and the warning area 108 (not shown in FIG. 18) exist on the first floor. The reference receiver 103 exists on a different floor (for example, the second floor) from the doorway 106 and the detection receiver 102. Specifically, the reference receiver 103 is present on a floor adjacent to the floor where the doorway 106 and the detection receiver 102 are present, and is present immediately above or directly below the warning area 107 or the warning area 108.

  Even in such an arrangement, by performing the same processing as described above, it is possible to reduce the influence of the transmitter 101 existing on another floor. Specifically, it is possible to suppress erroneous detection that the transmitter 101 existing on another floor has entered the warning area 107 or the warning area 108.

  Moreover, in the said description, although only the approach to each area | region is detected, in addition to this, the moving direction of a subject (transmitter 101) may be detected. That is, the management apparatus 104 may estimate the moving direction of the target person based on the time change of the target radio wave intensity and the reference radio wave intensity. Specifically, in the example illustrated in FIG. 2, when the target radio wave intensity increases and the reference radio wave intensity decreases, the management apparatus 104 determines that the target person is moving toward the entrance 106. To do. When the target radio wave intensity decreases and the reference radio wave intensity increases, the management apparatus 104 determines that the target person is moving in a direction away from the doorway 106.

  Note that the detected moving direction (such as toward the doorway 106) is displayed together with, for example, an alarm or warning information. Further, the type of warning and warning may be changed according to the moving direction. For example, when the target person is present in the alert area 108, stronger alertness may be called when the target person is heading toward the entrance 106 than when the target person is not. In addition, when a plurality of receivers are used as shown in FIG. 16, the moving direction can be estimated more accurately.

  In addition, the management device 104 may detect that the subject has passed through the doorway 106. That is, the management apparatus 104 determines whether the subject has passed through the doorway 106 based on the time change of the target radio wave intensity and the reference radio wave intensity. Specifically, in the example illustrated in FIG. 2, when the target radio wave intensity increases and the reference radio wave intensity decreases and then the target radio wave intensity decreases and the reference radio wave intensity further decreases, the management device 104 It is determined that the person has exited the doorway 106. In addition, when the target radio wave intensity increases and the reference radio wave intensity increases and then the target radio wave intensity decreases and the reference radio wave intensity further increases, the management apparatus 104 determines that the target person has entered the entrance 106.

  Furthermore, a reference receiver 103 may be provided outside the building 105. Thereby, it is possible to detect the passage of the subject person through the entrance 106 and that the subject has exited the building 105 with higher accuracy.

  Hereinafter, a method for setting the coefficients α and β will be described. FIG. 19 is a diagram illustrating an example of a screen displayed on the management apparatus 104. For example, as shown in FIG. 19, the coefficients α and β are set by the user via the management device 104.

  In addition, as shown in FIG. 19, the warning area 107 and the warning area 108 corresponding to the coefficients α and β set may be superimposed on the floor plan of the building 105 or the like.

  In this case, the management apparatus 104 acquires the floor plan of the building 105 and the position information of the detection receiver 102 and the reference receiver 103 in advance. For example, the position information of the detection receiver 102 and the reference receiver 103 may be input in advance to the management apparatus 104 by the user, or a position measurement unit (for example, GPS (Global) is provided in the detection receiver 102 and the reference receiver 103. Position information acquired by Positioning System)) may be transmitted to the management apparatus 104. The management device 104 calculates the ranges of the warning area 107 and the warning area 108 based on the position information and the set coefficient, and displays the obtained results.

  The user does not set the coefficients α and β, but the user specifies the range of the warning area 107 and the warning area 108 on the screen, and the management device 104 realizes the specified warning area 107 and the warning area 108. The coefficients α and β to be calculated may be automatically calculated.

  Alternatively, a setting mode may be provided. For example, the user carries the transmitter 101, moves to the boundary between the warning area 107 and the warning area 108, and performs a predetermined operation at that location. As a result, the target radio wave intensity and the reference radio wave intensity at the boundary are transmitted to the management apparatus 104, and the management apparatus 104 automatically calculates the coefficient α using the received target radio wave intensity and the reference radio wave intensity. Also, the coefficient β can be set by the same method.

  Further, the user performs the above operation in a state where the radio wave reception range of the transmitter 101 is maximized and a state where it is minimized, thereby notifying the management device 104 of the maximum radio wave intensity and the minimum radio wave intensity at each boundary. Then, the management apparatus 104 may calculate the coefficient using these pieces of information.

  Two or more of these setting methods may be combined.

  Although the detection system 100 according to the embodiment of the present invention has been described above, the present invention is not limited to this embodiment.

  For example, in the above-described embodiment, the example in which the transmitter 101 enters the two target areas (the alarm area 107 and the alert area 108) has been described. However, only the entry of the transmitter 101 into the alarm area 107 is detected. Alternatively, the entry of the transmitter 101 into three or more target areas may be detected.

  In the above description, an example is described in which it is detected that the target person (patient or the like) has approached the entrance of the building. However, the target person enters not only the exit (entrance / exit) of the building but also a predetermined space. The present invention can also be applied to a system for detecting this. Further, the target person is not limited to a patient or the like, but may be a moving body that holds the transmitter 101. For example, the monitoring target may be an animal or a movable machine.

  Further, the following method can be used as a method for wirelessly transmitting the notification signal 112. A transmission order is set for a plurality of receivers (including one or more detection receivers 102 and one or more reference receivers 103). The receiver having the first transmission order wirelessly transmits the notification signal 112 at a predetermined time period. The receiver having the second transmission order detects that the notification signal 112 transmitted from the receiver having the first transmission order has been received, and the notification signal 112 is received after a predetermined time from receiving the notification signal 112. Is transmitted wirelessly. The receiver having the third transmission order detects the reception of the notification signal 112 transmitted by the receiver having the second transmission order, and receives the notification signal 112 after a predetermined time after receiving the notification signal 112. Is transmitted wirelessly. Similarly, the subsequent receivers transmit the notification signal 112 using the notification signal 112 transmitted from the immediately preceding receiver as a trigger. Thereby, all radio | wireless communication can be performed in a short time, without an electromagnetic wave colliding.

  Each notification signal 112 includes zero or more pieces of received information (transmitter ID 161C and received radio wave intensity information 163). Each receiver holds the reception information of the detection signal 111 received between the transmission of the previous notification signal 112 and the next transmission, and the notification signal 112 including all the reception information held in the next transmission. Send. In each cycle, the management apparatus 104 makes a determination on the transmitter 101 corresponding to the transmitter ID 161C using the reception information having the same transmitter ID 161C included in the received plurality of notification signals 112. Further, the detection signal 111 may include a serial number that increases with each transmission. In this case, this serial number is also included in the notification signal 112. The management apparatus 104 performs determination using received information having the same transmitter ID 161C and having the same serial number. By using such a method, a highly reliable determination can be performed.

  In the above description, a warning or warning is presented when a predetermined condition is satisfied. However, the detection receiver 102 and the reference reception are affected by the change in the state of the transmitter 101 or the influence of reflection of radio waves. There is a possibility that an error occurs in the reception intensity with the device 103. As a result, erroneous detection may occur. In order to prevent such erroneous detection, the following processing may be performed.

  For example, the management device 104 may present a warning or warning when it is determined to be a warning or warning continuously for a plurality of times (for example, twice). Moreover, the management apparatus 104 does not need to present warning or warning when the change in received radio wave intensity is large. For example, if the received radio wave intensity is greater than the average value of the received radio wave intensity at the previous several times (for example, 3 times) by a predetermined value or more or a predetermined magnification or more (for example, 2 times or more), a warning or warning may not be presented. Also good. Alternatively, the management device 104 may use a moving average. Thus, it is possible to suppress the occurrence of erroneous detection due to a sudden change in received radio wave intensity due to the influence of noise.

  Each processing unit included in each device included in the detection system according to the above-described embodiment is typically realized as an LSI that is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include a part or all of them.

  Further, the circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. An FPGA (Field Programmable Gate Array) that can be programmed after manufacturing the LSI or a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used.

  Moreover, you may implement | achieve part or all of the function of each apparatus contained in the detection system which concerns on the said embodiment, when processors, such as CPU, run a program.

  Furthermore, the present invention may be the above program or a non-transitory computer-readable recording medium on which the above program is recorded. Needless to say, the program can be distributed via a transmission medium such as the Internet.

  Further, the present invention can be realized not only as a detection system but also as a transmitter, a receiver, a reference receiver, or a management device included in the detection system. In addition, the present invention can be realized as a detection method having steps as characteristic means included in such a detection system, or can be realized as a program for causing a computer to execute such characteristic steps. .

  Moreover, all the numbers used above are illustrated for specifically explaining the present invention, and the present invention is not limited to the illustrated numbers.

  In addition, division of functional blocks in the block diagram is an example, and a plurality of functional blocks can be realized as one functional block, a single functional block can be divided into a plurality of functions, or some functions can be transferred to other functional blocks. May be. In addition, functions of a plurality of functional blocks having similar functions may be processed in parallel or time-division by a single hardware or software.

  In addition, the order in which the steps shown in the flowchart are executed is for the purpose of illustrating the present invention specifically, and may be in an order other than the above. Also, some of the above steps may be executed simultaneously (in parallel) with other steps.

  As described above, the detection system according to one or more aspects has been described based on the embodiment. However, the present invention is not limited to this embodiment. Unless it deviates from the gist of the present invention, various modifications conceived by those skilled in the art have been made in this embodiment, and forms constructed by combining components in different embodiments are also within the scope of one or more aspects. May be included.

  The present invention can be applied to a detection system.

DESCRIPTION OF SYMBOLS 100 Detection system 101 Transmitter 102 Detection receiver 103, 103A, 103B Reference receiver 104 Management apparatus 105 Building 106 Entrance / exit 107 Alarm area 108 Warning area 111 Detection signal 112 Notification signal 121 Transmitter ID storage part 122 Wireless transmission part 123 Power supply Unit 131 Wireless receiving unit 132 Reception strength measuring unit 133 Notification signal generating unit 134 Transmitting unit 141 Receiving unit 142 Control unit 143 Input unit 144 Display unit 161A, 161B, 161C Transmitter ID
162 Receiver ID
163 Received signal strength information

Claims (13)

A detection system for detecting that a moving body approaches an exit or entrance of a predetermined space,
A detection receiver for detecting that the moving body has approached the outlet or the inlet;
A first reference receiver for assisting in detecting that the mobile has approached the outlet or inlet;
A transmitter that is held by the mobile body and wirelessly transmits a detection signal;
The detection receiver is disposed in a first region that is an area near the outlet or the inlet including the outlet or the inlet and that is a detection target of the entry of the moving body, and receives the detection signal. And
The first reference receiver is disposed outside the first region, receives the detection signal,
The detection system includes a first radio wave intensity that is a reception radio wave intensity of the detection signal received by the detection receiver and a second radio wave that is a reception radio wave intensity of the detection signal received by the first reference receiver. Based on the strength, it is determined whether the mobile body has entered the first area,
In the determination, the detection system includes:
Determining whether the ratio of the first radio field intensity to the second radio field intensity is greater than a predetermined value other than 1 ;
A detection system that determines that the moving body has entered the first region when the ratio is greater than the value. The detection system includes:
Determining whether a first multiplication value obtained by multiplying the second radio wave intensity by a predetermined first coefficient is equal to or less than the first radio wave intensity;
The detection system according to claim 1, wherein when the first multiplication value is less than or equal to the first radio wave intensity, it is determined that the moving body has entered the first region. The detection system further includes:
Determining whether a second multiplication value obtained by multiplying the second radio wave intensity by a predetermined second coefficient smaller than the first coefficient is equal to or less than the first radio wave intensity;
The detection system according to claim 2, wherein when the second multiplication value is equal to or less than the first radio wave intensity, the mobile body determines that the mobile body has entered a second area around the first area. Each of the detection receiver and the first reference receiver detects that the moving body has approached the outlet or the inlet, and assists in detecting that the moving body has approached the outlet or the inlet. The detection system according to any one of claims 1 to 3, wherein the detection system is used. The first reference receiver is disposed in a second region around the first region;
The detection system further includes:
A second reference receiver for assisting in detecting that the mobile body has approached the outlet or inlet;
The second reference receiver is disposed outside the first region and the second region, receives the detection signal,
The detection system further includes the movement based on the first radio wave intensity, the second radio wave intensity, and a third radio wave intensity that is a received radio wave intensity of the detection signal received by the second reference receiver. The detection system according to claim 2, wherein it is determined whether or not a body has entered the second area. The detection system further includes:
The third multiplication value is greater than the first radio wave intensity, and the first radio wave intensity or the second radio wave intensity is a received radio wave intensity of the detection signal received by the second reference receiver. The detection system according to claim 5, wherein when the radio wave intensity is larger than a third multiplication value obtained by multiplying a predetermined third coefficient, it is determined that the moving body has entered the second region. The detection system further includes:
If it is determined that the mobile body has entered the second area, a first warning is issued,
The detection system according to claim 5, wherein when it is determined that the moving body has entered the first area, a second warning stronger than the first warning is issued. The detection system according to any one of claims 1 to 7, wherein the detection system further estimates a moving direction of the moving body based on a temporal change in the first radio wave intensity and the second radio wave intensity. The detection system according to claim 8, wherein the detection system further determines whether the moving body has passed through the outlet or the entrance based on a temporal change in the first radio wave intensity and the second radio wave intensity. The detection system includes:
The detection system according to claim 1, wherein when the first radio wave intensity is smaller than a predetermined first threshold, it is not determined that the moving body has entered the first region. The moving body is a person;
The detection system according to claim 1, wherein the space is a building. The space is a multi-storey building,
The exit or entrance and the sensing receiver are on the same floor,
The detection system according to any one of claims 1 to 3, wherein the first reference receiver is present on a different floor from the outlet or entrance and the detection receiver. A detection method in a detection system for detecting that a moving body approaches an exit or entrance of a predetermined space,
The detection system includes:
A detection receiver for detecting that the moving body has approached the outlet or the inlet;
A first reference receiver for assisting in detecting that the mobile has approached the outlet or inlet;
A transmitter that is held by the mobile body and wirelessly transmits a detection signal;
The detection receiver is disposed in a first region that is an area near the outlet or the inlet including the outlet or the inlet and that is a detection target of the entry of the moving body, and receives the detection signal. And
The first reference receiver is disposed outside the first region, receives the detection signal,
The detection method is:
Based on the first radio wave intensity that is the received radio wave intensity of the detection signal received by the detection receiver and the second radio wave intensity that is the received radio wave intensity of the detection signal received by the first reference receiver, Determining whether the mobile body has entered the first region;
In the determination,
Determining whether the ratio of the first radio field intensity to the second radio field intensity is greater than a predetermined value other than 1 ;
The detection method which determines with the said mobile body having entered into the said 1st area | region when the said ratio is larger than the said value.

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