JP2017227531A - Detection system and detection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress wrong detection.SOLUTION: A detection system 100 includes: a detection receiver 102; a reference receiver 103; and a transmitter 101 that is held by a moving body, and wirelessly transmits a detection signal 111. The detection system is configured to: on the basis of object radio wave intensity serving as reception radio wave intensity of the detection signal 111 received by the detection receiver 102 in a period of a determination object or at a time thereof, and reference radio wave intensity serving as reception radio wave intensity of the detection signal 111 received by the reference receiver 103 in the period of the determination object or at the time thereof, implement first determination processing of determining whether a moving body enters into an alert area 107, and second determination processing of determining whether the reference radio wave intensity in a first period T1 prior to the period of the determination object or the time thereof is equal to or greater than a first threshold th2; when it is determined that the reference radio wave intensity in the first period T1 is less than the first threshold th2, determine that the moving body does not enter into the alert area 107 in the period of the determination object or at the time thereof regardless of a result of the first determination processing.SELECTED DRAWING: Figure 1

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).

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

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

  In such a detection system, it is desired that erroneous detection can be suppressed.

  Then, an object of this invention is to provide the detection system or detection method which can suppress a misdetection.

  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 has been approached, one or more reference receivers for assisting in detecting that the mobile body has approached the exit or entrance, and the mobile body And a transmitter that wirelessly transmits a detection signal, wherein the detection receiver is a region in the space near the outlet or the inlet including the outlet or the inlet, and detects the entry of the moving body The detection signal is disposed in a target region that is a target region, and the one or more reference receivers are disposed in the space, receive the detection signal, and detect the detection. The system determines the period to be judged Is a target radio wave intensity that is a received radio wave intensity of the detection signal received by the detection receiver at a time, and a first reference receiver included in the one or more reference receivers during the determination target period or time. A first determination process for determining whether or not the mobile object has entered the target area during the determination target period or time based on a first reference radio wave intensity that is a radio field intensity of the received detection signal; In the first period including the period to be determined or the period before the time, the detection is included in the one or more reference receivers and received by a second reference receiver that is the same as or different from the first reference receiver. And performing a second determination process for determining whether a second reference radio wave intensity, which is a received radio wave intensity of the signal, is equal to or greater than a predetermined first threshold value, and the second determination process in the first period in the second determination process. three When it is determined that the radio wave intensity is less than the first threshold value, it is determined that the moving object has not entered the target area in the determination target period or time regardless of the result of the first determination process. To do.

  According to this configuration, when a sneak occurs such that the detection signal is received by the detection receiver via the outside of the space, erroneous detection based on the sneak can be suppressed.

  For example, in the first determination process, the detection system may obtain a multiplication value obtained by multiplying the first reference radio wave intensity in the period or time of the determination target by a predetermined coefficient. It is determined whether or not the target radio wave intensity is less than or equal to the period or time, and when the multiplication value in the determination target period or time is less than or equal to the target radio wave intensity, it is determined that the mobile object has entered the target area Good.

  According to this configuration, since it is possible to determine whether the moving body has entered the target area based on the ratio between the target radio wave intensity and the reference radio wave intensity, it is possible to realize highly accurate detection that does not depend on the state of the transmitter.

  For example, in the first determination process, the detection system is configured such that the target radio wave intensity in the determination target period or time is equal to or greater than a predetermined second threshold value, and the determination target period or time is the first time. It is determined whether one reference radio wave intensity is less than a predetermined third threshold, the target radio wave intensity in the determination target period or time is equal to or greater than the second threshold, and the determination target period or time When the first reference radio wave intensity at is less than the third threshold value, it may be determined that the moving body has entered the target area.

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

  For example, the detection system further includes an auxiliary receiver that is disposed in the space and outside the target area, and that receives the detection signal, and includes a period before the determination target period or a time period. In the third determination process, a third determination process is performed to determine whether an auxiliary radio wave intensity, which is a radio wave intensity of the detection signal received by the auxiliary receiver in two periods, is greater than or equal to a predetermined fourth threshold value. When it is determined that the auxiliary radio wave intensity in the second period is greater than or equal to the fourth threshold value, the moving object moves in the target region in the determination target period or time regardless of the result of the first determination process. It may be determined that the vehicle has not entered.

  According to this configuration, erroneous detection based on the wraparound or the like can be suppressed.

  For example, the detection system further includes a reception radio wave of the detection signal received by a passage detection receiver included in the one or more reference receivers in a third period including a period before the determination target period or a time. A passing radio wave intensity which is an intensity, and a third reference radio wave intensity which is included in the one or more reference receivers and which is a received radio wave intensity of the detection signal received by a third reference receiver different from the pass detection receiver. And a fourth determination process for determining whether or not the mobile object has passed near the passage detection receiver. In the fourth determination process, the mobile object is the passage detection receiver in the third period. If it is determined that the vehicle does not pass through the vicinity of the object, even if it is determined that the mobile object has not entered the target area in the determination target period or time regardless of the result of the first determination process. There.

  According to this configuration, erroneous detection based on the wraparound or the like can be suppressed.

  For example, in the detection system, when the second reference radio wave intensity in the first period is less than the first threshold, the detection signal entering from outside the space is detected by the detection receiver. May be determined.

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

  The detection method according to one aspect of the present invention is a detection method in a detection system for detecting that a moving body approaches an exit or entrance of a predetermined space, and the detection system includes the movement A detection receiver for detecting that a body has approached the outlet or inlet; one or more reference receivers for assisting in detecting that the mobile body has approached the outlet or inlet; and the mobile body And a transmitter for wirelessly transmitting a detection signal, wherein the detection receiver is a region in the space near the outlet or the inlet including the outlet or the inlet, and the entrance of the moving body Arranged in a target area that is a detection target area, and receives the detection signal, and the one or more reference receivers are arranged in the space and receive the detection signal, The detection method includes a determination pair. And the first reference reception included in the one or more reference receivers during the period or time of the determination target and the target radio wave intensity that is the received radio wave intensity of the detection signal received by the detection receiver during the period or time A first determination process for determining whether or not the mobile object has entered the target area during the determination target period or time based on a first reference radio wave intensity that is a radio field intensity of the detection signal received by a device. And in the first period including the period to be determined or the period before the time, the first reference receiver is included in the one or more reference receivers, and is received by the second reference receiver that is the same as or different from the first reference receiver. A second determination process for determining whether the second reference radio wave intensity, which is the received radio wave intensity of the detection signal, is equal to or higher than a predetermined first threshold value, and the second determination process is performed before the first period. When it is determined that the second reference radio wave intensity is less than the first threshold value, the moving object has entered the target area during the determination target period or time regardless of the result of the first determination process. Judge that there is no.

  According to this, when a sneak occurs such that the detection signal is received by the detection receiver via the outside of the space, it is possible to suppress erroneous detection based on the sneak.

  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. 1 is a diagram illustrating a configuration of a detection system according to an embodiment. FIG. 2 is a diagram illustrating a connection relationship in the detection system according to the embodiment. FIG. 3 is a diagram for explaining the problem of the detection system. FIG. 4 is a block diagram showing the configuration of the transmitter according to the embodiment. FIG. 5 is a diagram illustrating a configuration of a detection signal according to the embodiment. FIG. 6 is a diagram illustrating a configuration of the receiver according to the embodiment. FIG. 7 is a diagram illustrating a configuration of a notification signal according to the embodiment. FIG. 8 is a diagram illustrating a configuration of the management device according to the embodiment. FIG. 9 is a flowchart of the determination process 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 diagram for explaining the determination processing according to the embodiment. FIG. 13 is a flowchart of a modified example of the determination process according to the embodiment. FIG. 14 is a diagram illustrating a configuration of a detection system according to a modification of the embodiment. FIG. 15 is a flowchart of determination processing according to a modification of the embodiment. FIG. 16 is a diagram for describing determination processing according to a modification of the embodiment. FIG. 17 is a diagram for describing determination processing according to a modification of the embodiment.

  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.

  First, a schematic configuration and problems of the detection system according to the present embodiment will be described. FIG. 1 is a diagram showing a configuration of a 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 moving body enters or leaves the 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, a management device 104, and an auxiliary receiver 109.

  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. 1, 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 and the warning area 108 are areas in the building 105 and are target areas to be detected by the target person entering. 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 auxiliary receiver 109 is disposed inside the building 105 and outside the warning area 107 and the warning area 108. The auxiliary receiver 109 is used to detect the approximate position in the building 105 of the subject person.

  FIG. 2 is a diagram illustrating a connection relationship between the devices. In FIG. 2, only one detection receiver 102, reference receiver 103, and auxiliary receiver 109 are shown for simplification of explanation. As shown in FIG. 2, the detection receiver 102, the reference receiver 103, and the auxiliary receiver 109 receive the detection signal 111 transmitted from the transmitter 101. In addition, when the detection receiver 102, the reference receiver 103, and the auxiliary receiver 109 receive the detection signal 111, the detection receiver 102, the reference receiver 103, and the auxiliary receiver 109 transmit a notification signal 112 to the management device 104.

  In FIG. 1, 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. Similarly, the number and arrangement method of the reference receiver 103 and the auxiliary receiver 109 may be arbitrary. 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 and auxiliary receivers 109 may be disposed outside the building 105.

  In addition, the notification signal 112 may be transmitted from the detection receiver 102, the reference receiver 103, and the auxiliary receiver 109 to the management apparatus 104 by any method, and may be performed by either a wired method or a wireless method. Further, the notification signal 112 may be transmitted directly from the detection receiver 102, the reference receiver 103, and the auxiliary receiver 109 to the management apparatus 104, or may be transmitted via another device. For example, the other detection receiver 102, the other reference receiver 103, or the other auxiliary receiver 109 has a relay function, and the other detection receiver 102, the other reference receiver 103, or the other auxiliary reception. The notification signal 112 may be transmitted to the management device 104 via the device 109.

  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.

  Specifically, the management device 104 uses the target radio wave intensity that is the reception radio wave intensity of the detection signal 111 received by the detection receiver 102 and the reception radio wave intensity of the detection signal 111 received by the reference receiver 103. A certain reference radio wave intensity is used to detect whether the monitoring target person has entered the warning area 107 or the warning area 108. Thereby, compared with the case where only the detection receiver 102 is used, it is possible to detect the entry into the warning area 107 or the warning area 108 of the monitoring subject with higher accuracy.

  In addition, the management device 104 receives the notification signal 112 transmitted from the auxiliary receiver 109 and detects the position where the monitoring target person exists using information included in the notification signal 112. Specifically, the management apparatus 104 knows the installation position of the auxiliary receiver 109 and determines that there is a person to be monitored around the auxiliary receiver 109 that has received the detection signal 111. The management apparatus 104 determines how far the transmitter 101 is from the auxiliary receiver 109 according to the auxiliary reception intensity that is the reception radio wave intensity of the detection signal 111 received by the auxiliary receiver 109. May be determined.

  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.

  Problems in such a system will be described with reference to FIG. For example, as shown in FIG. 3, depending on the structure of the building 105 and the position of the person to be monitored (transmitter 101), the detection signal 111 may be received by the detection receiver 102 via the outside of the building 105. is assumed. In addition, the radio wave intensity of the detection signal 111 entering from the outside of the building 105 may change depending not only on the position of the transmitter 101 but also on the surrounding state. For example, a detection signal 111 that does not normally occur may occur due to opening / closing of a window or door, or a reflector 181 such as a bus stopping near the entrance 106.

  Hereinafter, a method for suppressing such erroneous detection will be described. First, the configuration of each device will be described.

  FIG. 4 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. 5 is a diagram illustrating the configuration of the detection signal 111. As shown in FIG. 5, the detection signal 111 includes a transmitter ID 161 </ b> B for identifying a transmission source transmitter that is the transmission source 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. 6 is a block diagram illustrating a configuration of the detection receiver 102. The configurations of the reference receiver 103 and the auxiliary receiver 109 are the same as those 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. 7 is a diagram illustrating a configuration of the notification signal 112. As shown in FIG. 7, the notification signal 112 includes a transmitter ID 161C, 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, the reference receiver 103, or the auxiliary receiver 109 that has received the detection signal 111, and the detection receiver 102, the reference receiver 103, or the auxiliary receiver that is the transmission source of the notification signal 112. 109 is shown.

  The reception radio wave intensity information 163 indicates the reception radio wave intensity of the detection signal 111 received by the detection receiver 102, the reference receiver 103, or the auxiliary receiver 109.

  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.

  Further, the detection receiver 102, the reference receiver 103, or the auxiliary receiver 109 does not transmit the notification signal 112 only during the period in which the detection signal 111 is received, but does not receive the detection signal 111. Alternatively, a notification signal 112 indicating that the detection signal 111 has not been received may be transmitted.

  FIG. 8 is a block diagram illustrating the 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, the reference receiver 103, or the auxiliary receiver 109.

  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. In addition, the control unit 142 detects the position of the transmitter 101 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 the position of the transmitter 101, warning, warning information, and the like.

  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, the auxiliary receiver 109, and the management device 104 are individually described. However, the detection receiver 102, the reference receiver 103, or the auxiliary receiver 109 and the management apparatus 104 are managed. The device 104 may be configured as a single device. In other words, at least one of the detection receiver 102, the reference receiver 103, and the auxiliary receiver 109 may have at least a part of the 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. 9 is a flowchart of determination processing by the management apparatus 104. For example, the process shown in FIG. 9 is repeatedly executed based on the latest notification signal 112 at a predetermined cycle.

  10 to 12 show the target radio wave intensity, the reference radio wave intensity, and the auxiliary radio wave intensity of the detection signal 111 received by the detection receiver 102, the reference receiver 103, and the auxiliary receiver 109 in each operation example. It is a figure which shows an example of a radio wave intensity. FIG. 10 is an operation example in a normal case and is a diagram illustrating an operation example when the transmitter 101 enters the alarm area 107. FIG. 11 and FIG. 12 show an operation example when the detection signal 111 is received by the detection receiver 102 due to the detection signal 111 wraparound or the like when the transmitter 101 has not entered the alarm area 107. FIG. 10-12, only the operation | movement with respect to an alarm is described for simplification of description, and the operation | movement with respect to warning is not described.

  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. When there are a plurality of reference receivers 103, the reference radio wave intensity in one of the reference receivers 103 may be used, or the reference radio wave intensity is calculated by the same method as that for the detection receiver 102. May be. Similarly, when there are a plurality of auxiliary receivers 109, the auxiliary radio wave intensity in one of the auxiliary receivers 109 may be used, or the auxiliary radio wave intensity may be increased by the same method as that for the detection receiver 102. It may be calculated.

  Further, as each received radio wave intensity, an average value, a maximum value, or a minimum value of a plurality of received radio wave intensity in the time axis direction may be used. Furthermore, these may be determined based on the received radio wave intensity excluding the received radio wave intensity indicating an abnormal value.

  First, an operation example in a normal case where the transmitter 101 enters the alarm area 107 will be described with reference to FIGS. 9 and 10.

  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 equal to or greater than the threshold th1 (S101). Here, the threshold value th1 corresponds to the assumed minimum received radio wave intensity of the detection receiver 102 when the transmitter 101 enters the alert area 108. 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 less than the threshold th1 (No in S101), 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 is close to the doorway 106. Therefore, it is determined that there is no abnormality (S108).

  For example, in the example of FIG. 10, since the target person approaches the alarm area 107 from the inside of the building 105, the reference radio wave intensity first increases and then the target radio wave intensity increases. In the period up to time t0, it is determined that there is no abnormality because the target radio wave intensity is lower than the threshold th1. At time t0, the target radio wave intensity becomes equal to or higher than the threshold th1.

  When the target radio wave intensity is equal to or higher than the threshold th1 (Yes in S101), the management apparatus 104 determines that the reference radio wave intensity in the first period T1 immediately before the determination target period or time is a predetermined threshold th2 (first threshold). It is determined whether this is the case (S102). Specifically, the management device 104 determines whether the reference radio wave intensity is the threshold th2 during at least a part of the first period T1. That is, it is determined whether the reference receiver 103 has received the detection signal 111 in the first period T1.

  Here, the period or time of the determination target is a period in which various data (target radio wave intensity and reference radio wave intensity, etc.) to be subjected to the determination process in the current process are obtained in a repetitive process performed at a predetermined time interval. Or time. In other words, the target radio wave intensity and the reference radio wave intensity used for the processing may be obtained at a certain same time, may be obtained at different times included in a certain period, Data obtained at a plurality of times included in a certain period (for example, an average value or a complementary value) may be used.

  In the example of FIG. 10, since the reference radio wave intensity is equal to or higher than the threshold th2 in the first period T1 immediately before time t0 (Yes in S102), the process proceeds to step S103. For example, the length of the first period T1 is about several tens of seconds. Note that the first period T1 may include at least a period to be determined or a period before the time. For example, the first period T1 may include a part or all of the determination target period or time. Further, the determination period or time of the first period T1 may not be the immediately preceding period, and there is a period that is not used for determination between the first period T1 and the determination period or time. Also good.

  When the reference radio wave intensity in the first period T1 is equal to or greater than the threshold th2 (Yes in S102), the management apparatus 104 determines that the auxiliary radio wave intensity in the second period T2 immediately before the determination target period or time is a predetermined threshold value. It is determined whether it is greater than th3 (fourth threshold) (S103). That is, in the second period T2, it is determined whether the auxiliary receiver 109 has received the detection signal 111.

  In the example of FIG. 10, since the reference radio wave intensity is less than the threshold th2 in the first period T1 immediately before time t0 (No in S103), the process proceeds to step S104. For example, the second period T2 is longer than the first period and is about several tens of seconds to several minutes. Note that the second period T2 may include at least a period to be determined or a period before the time. For example, part or all of the determination target period or time may be included in the second period T2. In addition, in the second period T2, the determination target period or time may not be the immediately preceding period, and there is a period that is not used for determination between the second period T2 and the determination target period or time. Also good.

  When the auxiliary radio wave intensity in the second period T2 is less than the threshold th3 (No in S103), 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. To do.

  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 ( S104). 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. For example, when the coefficient α is 1, the above condition is satisfied when the transmitter 101 is closer to the detection receiver 102 than the reference receiver 103.

  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 S104), the management apparatus 104 determines that the transmitter 101 has entered the alarm area 107 and presents an alarm (S106). ). 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.

  In the example of FIG. 10, an alarm is notified when the above condition is satisfied at time t1.

  On the other hand, when the first multiplication value is larger than the target radio wave intensity (No in S104), 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.

  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 ( S105). 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.

  When the second multiplication value is equal to or lower than the target radio wave intensity (Yes in S105), the management apparatus 104 determines that the transmitter 101 has entered the alert area 108 and presents alert information (S107). 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.

  When the second multiplication value is greater than the target radio wave intensity (No in S105), 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 (S108).

  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.

  Next, using FIG. 9, FIG. 11 and FIG. 12, the operation when the transmitter 101 has not entered the alarm area 107 but the detection signal 111 is received by the detection receiver 102 due to wraparound or the like will be described. To do. First, the example of FIG. 11 will be described.

  In the example of FIG. 11, the entry condition (S104) of the alarm area 107 of the transmitter 101 based on the target radio wave intensity and the reference radio wave intensity is satisfied at time t2. On the other hand, unlike the example of FIG. 10, the transmitter 101 does not reach the vicinity of the detection receiver 102 via the vicinity of the reference receiver 103, and therefore the reference radio wave intensity is equal to the period T1 immediately before time t <b> 2. It is less than the threshold th2 (No in S102). In this case, the management apparatus 104 determines that the detection signal 111 that has entered from the outside of the building 105 through the doorway 106 or other area (wall or window) is detected by the detection receiver 102 (false detection). . That is, the management device 104 determines that there is no abnormality because the transmitter 101 has not entered either the warning area 107 or the warning area 108 and the subject is not in proximity to the doorway 106 (S108).

  In this case, when the subject reaches the warning area 107 from the building 105, the reference receiver 103 needs to receive the detection signal 111 that is equal to or greater than the threshold th2. In other words, the plurality of reference receivers 103 need to be arranged so as to cover every route from which the subject reaches the warning area 107 from within the building 105.

  As described above, when the reference radio wave intensity in the first period T1 including the period before the determination target period or the time is less than the threshold th2, the management apparatus 104 determines the target person (transmission) in the determination target period or time. It is determined that the device 101) has not entered the target area (alarm area 107 or alert area 108). Thereby, it is possible to suppress malfunction caused by the detection signal 111 sneaking around from outside the building 105.

  On the other hand, the wraparound of the detection signal 111 may affect the reference receiver 103. FIG. 12 is a diagram illustrating an operation example in this case.

  In the example of FIG. 12, the entry condition (S104) of the alarm region 107 of the transmitter 101 based on the target radio wave intensity and the reference radio wave intensity is satisfied at time t3. Further, the reference radio wave intensity is greater than or equal to the threshold th2 in the vicinity of time t3 due to the influence of wraparound and the like. Therefore, in the operation shown in FIG. 11 (step S102 in FIG. 9), erroneous detection cannot be excluded.

  On the other hand, in step S103, the management apparatus 104 determines whether the auxiliary radio wave intensity in the second period T2 including the period to be determined or the period before the time is equal to or higher than the threshold th3, and the auxiliary radio wave in the second period T2 When the intensity is greater than or equal to the threshold th3 (Yes in S103), a detection signal 111 that has entered from the outside of the building 105 through the doorway 106 or another area (such as a wall or window) is detected by the detection receiver 102 ( False detection). That is, the management device 104 determines that there is no abnormality because the transmitter 101 has not entered either the warning area 107 or the warning area 108 and the subject is not in proximity to the doorway 106 (S108).

  In other words, the management device 104 detects that the transmitter 101 exists outside the alarm area 107 based on the auxiliary radio wave intensity even when the detection signal 111 is detected by the detection receiver 102. It is determined to be detected. Therefore, the length of the period T2 may be determined according to the distance between the auxiliary receiver 109 and the warning area 107 (the longer the distance, the longer the period T2). In addition, the period T <b> 2 may be set to a different length for each auxiliary receiver 109. Further, the determination of the auxiliary radio wave intensity does not have to be performed for all the auxiliary receivers 109, and may be performed only for the auxiliary receivers 109 whose distance from the alarm area 107 is a predetermined value or more.

  As described above, when the auxiliary radio wave intensity in the second period T2 including the determination target period or the period before the time is equal to or greater than the threshold th3, the management apparatus 104 determines whether the target person (transmission) is transmitted in the determination target period or time. It is determined that the device 101) has not entered the target area (alarm area 107 or alert area 108). Thereby, it is possible to suppress malfunction caused by the detection signal 111 sneaking around from outside the building 105.

  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.

  Further, the reference receiver 103 used for determination of erroneous detection (S102) and the reference receiver 103 used for determination of entry into the target area (alarm area 107 and warning area 108) (S104 and S105) are the same. It may be a receiver or a different receiver. For example, a part of the reference receiver 103 used for the determination of entry into the target area (the alarm area 107 and the alarm area 108) (S104 and S105) may be used for the erroneous detection determination (S102). Alternatively, a receiver dedicated to determination of false detection different from the reference receiver 103 may be used.

  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 101 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).

  Further, in the above description, determination of false detection using the reference radio wave intensity (S102), determination of false detection using the auxiliary radio wave intensity (S103), and target area using the target radio wave intensity and the reference radio wave intensity (alarm) The example in which the entry determination (S104 and S105) to the area 107 and the warning area 108) is performed in this order has been described, but the processing order may be arbitrary. For example, when it is determined that there is an entry (Yes in S104 or Yes in S105) in the entry determination (S104 and S105) to the target area (alarm area 107 and warning area 108), the determination of false detection (S102 or S103) ) May be performed.

  Further, when it is determined that there is a false detection in the determination of erroneous detection (S102 and S103) (No in S102 or Yes in S103), or it is determined that there is an entry in the determination of entry into the target area (S104 and S105), And when it determines with a false detection, the invalid period which does not perform the said determination process may be provided, and the determination process may be restarted after the said invalid period passes.

  In the above description, both the detection error detection using the reference signal strength (S102) and the detection error detection using the auxiliary signal strength (S103) are both performed, but only one of them is performed. May be. In addition, when the determination of erroneous detection using the auxiliary radio wave intensity is not performed (S103), the detection system 100 may not include the auxiliary receiver 109.

  Further, when a false detection is detected (No in S102 or Yes in S103), a notification that a false detection has occurred may be notified. Further, it may be notified that there is a high possibility of erroneous detection together with a warning or warning notice.

  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. 13, 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. 13 is different from the process shown in FIG. 9 in that steps S104 and S105 are replaced with S104A and S105A.

  That is, when the auxiliary radio wave intensity in the second period T2 is less than the threshold th3 (No in S103), the management apparatus 104 has the target radio wave intensity equal to or higher than the predetermined first threshold and the reference radio wave intensity is predetermined. It is determined whether it is less than the predetermined second threshold (S104A).

  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 S104A), the management device 104 determines that the transmitter 101 has entered the alarm area 107, and generates an alarm. Is presented (S106).

  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 S104A), the management device 104 determines that the target radio wave intensity is equal to or higher than a predetermined third threshold value. And whether the reference radio wave intensity is less than a predetermined fourth threshold value (S105A).

  When the target radio wave intensity is greater than or equal to the third threshold value and the reference radio wave intensity is less than the fourth threshold value (Yes in S105A), the management device 104 determines that the transmitter 101 has entered the alert area 108, and is alerted. Information is presented (S107).

  In addition, when the target radio wave intensity is less than the third threshold value or the reference radio wave intensity is equal to or greater than the fourth threshold value (No in S105A), the management device 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 doorway 106, it is determined that there is no abnormality (S108).

  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.

  Also, some reference receivers 103 may be installed in the alert area 108. In the above description, the detection receiver 102, the reference receiver 103, and the auxiliary receiver 109 are individually described. However, one receiver serves as at least two for detection, reference, and auxiliary. Also good.

  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, 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, when the target radio wave intensity decreases and the reference radio wave intensity further decreases after the target radio wave intensity increases and the reference radio wave intensity decreases, the management device 104 determines that the target person has exited the entrance 106. judge. 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.

  As described above, the detection system 100 has one or more target radio wave strengths that are the received radio wave strength of the detection signal 111 received by the detection receiver 102 in the determination target period or time, and one or more in the determination target period or time. Based on the first reference radio wave intensity that is the radio wave intensity of the detection signal 111 received by the first reference receiver included in the reference receiver 103, the mobile object is set to the target area (alarm area 107 or One or more reference receptions in a first determination process (S104 and S105 in FIG. 9) for determining whether or not the vehicle has entered the alert area 108) and a first period T1 including a determination target period or a period before the time The second reference radio wave intensity, which is the reception radio wave intensity of the detection signal 111 included in the receiver 103 and received by the second reference receiver that is the same as or different from the first reference receiver, is determined in advance. Second determination process for determining the whether the first threshold th2 or more (S102) and performs.

  Furthermore, when it is determined in the second determination process that the second reference radio wave intensity in the first period T1 is less than the first threshold th2 (No in S102), the detection system 100 performs the first determination process (S104 and Regardless of the result of S105), it is determined that the mobile object has not entered the target area during the determination target period or time (S108).

  In addition, the detection system 100 determines that the auxiliary radio wave intensity, which is the radio wave intensity of the detection signal 111 received by the auxiliary receiver 109 in the second period T2 before the determination target period or time, is a predetermined fourth threshold th3. A third determination process (S103) is performed to determine whether this is the case. When it is determined in the third determination process that the auxiliary radio wave intensity in the second period T2 is equal to or greater than the fourth threshold th3 (Yes in S103), the detection system 100 determines whether the determination target is irrespective of the result of the first determination process. It is determined that the moving object has not entered the target area during the period or time (S108).

  Further, in order to further avoid erroneous detection, the following processing may be performed. In the processing described above, erroneous detection may occur depending on the usage environment or the like. This is the case, for example, when a sufficient number of reference receivers 103 and auxiliary receivers 109 cannot be installed due to cost or installation location restrictions. Specifically, the entrance 106 is provided on the first floor of the building 105, and a living room or the like is provided on the second floor above the entrance 106. In this case, there is a possibility that the detection signal 111 from the transmitter 101 held by the subject on the second floor reaches the detection receiver 102 and the reference receiver 103 due to outdoor reflection or through the floor. . For example, when the subject moves from above the reference receiver 103 to above the entrance / exit 106 (detection receiver 102) on the second floor. As a result, there is a possibility that an alarm is notified even though the subject is not approaching the doorway 106.

  FIG. 14 is a diagram illustrating a configuration of a detection system 100 </ b> A that is a modification of the detection system 100. The detection system 100A shown in FIG. 14 further includes a passage detection receiver 191 and a reference receiver 192. The functions of the passage detection receiver 191 and the reference receiver 192 are the same as those of the detection receiver 102 and the reference receiver 103 described above, for example. The passage detection receiver 191 and the reference receiver 192 receive the detection signal 111 and transmit a notification signal 112 indicating the reception result to the management apparatus 104.

  The passage detection receiver 191 is disposed on a path that the subject person always passes when going to the entrance / exit 106 from the inside. For example, the passage detection receiver 191 is disposed inside the building 105 and outside the warning area 107 and the warning area 108. The reference receiver 192 is disposed around the passage detection receiver 191.

  FIG. 15 is a flowchart of determination processing by the management apparatus 104 in this case. In the process shown in FIG. 15, step S109 is added to the process shown in FIG. FIGS. 16 and 17 are diagrams showing an operation example in this case. Hereinafter, the received radio wave intensity of the detection signal 111 received by the pass detection receiver 191 is referred to as a pass radio wave intensity.

  In step S <b> 109, the management apparatus 104 determines that the target person (transmitter 101) is a passage detection receiver based on the passing radio wave intensity and the reference radio wave intensity in the third period T <b> 3 including the determination target period or the period before the time. It is determined whether the vicinity of 191 is passed. Specifically, in the third period T3, the management device 104 has a passing reception intensity equal to or greater than the threshold th4, and the transmitter 101 exists in the vicinity of the passing detection receiver 191 based on the passing radio wave intensity and the reference radio wave intensity. This is the case when it is determined. Here, the reference radio wave intensity is the received radio wave intensity of the detection signal 111 detected by the reference receivers 192 and 103 shown in FIG. Further, as a determination method based on the passing radio wave intensity and the reference radio wave intensity, for example, the method using the ratio of the passing radio wave intensity and the reference radio wave intensity as in step S104, or the pass as in step S104A in FIG. 13A. A method of comparing each of the radio field intensity and the reference radio field intensity with a threshold value can be used. The third period T3 is longer than the first period T1, and is, for example, about several tens of seconds to several minutes. Note that the third period T3 may include at least a period to be determined or a period before the time. For example, part or all of the determination target period or time may be included in the third period T3. In addition, in the third period T3, the determination target period or time may not be the immediately preceding period, and there is a period that is not used for determination between the third period T3 and the determination target period or time. Also good.

  In the third period T3, when the subject does not pass near the passage detection receiver 191 (No in S191), the management device 104 determines that the subject is in the alarm area 107 and the alert area 108 in the period or time of the judgment target. It is determined that the vehicle has not entered (S108).

  FIG. 16 is an operation example in a normal case and is a diagram illustrating an operation example when the transmitter 101 enters the alarm area 107. FIG. 17 shows an operation example when the detection signal 111 is received by the detection receiver 102 and the reference receiver 103 due to the detection signal 111 wraparound or the like when the transmitter 101 has not entered the alarm area 107. FIG.

  In the example of FIG. 16, since the target person passes through the vicinity of the passage detection receiver 191 from the inside of the building 105 and approaches the alarm area 107, first, the passing radio wave intensity increases, and then the reference radio wave intensity increases. Then, the target radio wave intensity increases. That is, at time t4 when detection is determined based on the target radio wave intensity (Yes in S104), the reference radio wave intensity in the first period T1 is higher than the threshold th2 (Yes in S102), and passage is detected in the third period. (Yes in S109), an alarm is notified (S106).

  On the other hand, in the example of FIG. 17, for example, the target person exists on the second floor above the doorway 106, and the reference forward radio wave intensity and the target radio wave intensity satisfy the detection conditions due to wraparound or the like (Yes in S102, and Yes in S104). In this case, however, no passage is detected by the passage detection receiver 191 (No in S109), so it is determined that there is a false detection, and no alarm is notified (S108).

  Thus, erroneous detection can be further suppressed by using the above method.

  Here, an example in which only one passage detection receiver 191 is disposed has been described, but a plurality of passage detection receivers 191 may be disposed. In addition, here, the reference receiver 103 is used for reference to both the detection receiver 102 and the passage detection receiver 191, but it is not always necessary to use both. In addition, here, the detection receiver 102, the reference receivers 103 and 192, and the passage detection receiver 191 are distinguished from each other, but the functions of a plurality of these receivers are shared by one receiver. May be. For example, the reference receiver 103 shown in FIG. 14 may be used as the passage detection receiver 191. In this case, the detection receiver 102 may be used as a reference receiver 192 for the passage detection receiver 191. In this case, a reference receiver for the passage detection receiver 191 may be installed on the second floor in order to prevent erroneous detection on the second floor.

  Further, in FIG. 15, determination of false detection using the reference radio wave intensity (S102), determination of false detection using the auxiliary radio wave intensity (S103), and determination of false detection using the passing radio wave intensity (S109). In the above example, the determination to enter the target area (the alarm area 107 and the warning area 108) using the target radio wave intensity and the reference radio wave intensity (S104 and S105) is performed in this order. However, the processing order may be arbitrary. .

  Further, in FIG. 15, determination of false detection using the reference radio wave intensity (S102), determination of false detection using the auxiliary radio wave intensity (S103), and determination of false detection using the passing radio wave intensity (S109). However, only one or two of them may be performed.

  As described above, the detection system 100A receives the received radio wave intensity of the detection signal 111 received by the passage detection receiver 191 included in one or more reference receivers in the third period T3 before the determination target period or time. And the received radio wave intensity of the detection signal 111 received by a third reference receiver (reference receiver 192) different from the pass detection receiver 191 and included in one or more reference receivers. Based on the reference radio wave intensity, a fourth determination process is performed to determine whether the mobile body has passed in the vicinity of the passage detection receiver 191 (S109). In the fourth determination process, the detection system 100A determines that the moving object has not passed near the passage detection receiver 191 in the third period T3 (No in S109). Regardless of the result, it is determined that the moving object has not entered the target area in the period or time of the determination target (S108).

  The detection systems 100 and 100A according to the embodiment of the present invention have been described above, but 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. The approach 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, one or more reference receivers 103, and one or more auxiliary receivers 109). 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.

100, 100A Detection system 101 Transmitter 102 Detection receiver 103, 192 Reference receiver 104 Management device 105 Building 106 Entrance 107 Alarm area 108 Alarm area 109 Auxiliary receiver 111 Detection signal 112 Notification signal 121 Transmitter ID storage section 122 Wireless Transmission unit 123 Power supply unit 131 Wireless reception unit 132 Reception intensity measurement unit 133 Notification signal generation unit 134 Transmission unit 141 Reception unit 142 Control unit 143 Input unit 144 Display unit 161A, 161B, 161C Transmitter ID
162 Receiver ID
163 Received signal strength information 181 Reflector 191 Passing detection receiver

Claims (8)

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;
One or more reference receivers to assist 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 an area in the space in the vicinity of the outlet or the inlet including the outlet or the inlet, and is disposed in a target area that is a detection target area of the moving body, Receive the detection signal,
The one or more reference receivers are arranged in the space and receive the detection signal;
The detection system includes:
The target radio wave intensity that is the received radio wave intensity of the detection signal received by the detection receiver during the determination target period or time, and the first or more reference receivers included in the determination target period or time A first determination is made as to whether or not the mobile object has entered the target region during the determination target period or time based on a first reference radio wave intensity that is a radio field intensity of the detection signal received by a reference receiver. Judgment processing,
In the first period including the period to be determined or the period before the time, the detection is included in the one or more reference receivers and received by a second reference receiver that is the same as or different from the first reference receiver. A second determination process for determining whether a second reference radio wave intensity, which is a received radio wave intensity of the signal, is equal to or higher than a predetermined first threshold;
If it is determined in the second determination process that the second reference radio wave intensity in the first period is less than the first threshold, the determination target period or time regardless of the result of the first determination process A detection system that determines that the moving body has not entered the target area. In the first determination process, the detection system includes:
Determining whether a multiplication value obtained by multiplying the first reference radio wave intensity in the determination target period or time by a predetermined coefficient is equal to or less than the target radio wave intensity in the determination target period or time;
The detection system according to claim 1, wherein when the multiplication value in the period or time of the determination target is equal to or less than the target radio wave intensity, it is determined that the mobile body has entered the target area. In the first determination process, the detection system includes:
The target radio wave intensity in the determination target period or time is greater than or equal to a predetermined second threshold, and the first reference radio wave intensity in the determination target period or time is less than a predetermined third threshold. Determine if there is
When the target radio wave intensity in the determination target period or time is greater than or equal to the second threshold, and the first reference radio wave intensity in the determination target period or time is less than the third threshold, the mobile object The detection system according to claim 1, wherein it is determined that has entered the target area. The detection system further includes:
Disposed in the space and outside the target area, and includes an auxiliary receiver for receiving the detection signal;
It is determined whether or not an auxiliary radio wave intensity that is a radio wave intensity of the detection signal received by the auxiliary receiver in a second period including a period before the determination or a time before the time is equal to or greater than a predetermined fourth threshold value. Perform a third determination process,
When it is determined in the third determination process that the auxiliary radio wave intensity in the second period is greater than or equal to the fourth threshold, the determination target period or time is determined regardless of the result of the first determination process. The detection system according to any one of claims 1 to 3, wherein it is determined that a moving body has not entered the target area. The detection system further includes:
A passage radio wave intensity that is a reception radio wave intensity of the detection signal received by a passage detection receiver included in the one or more reference receivers in a third period including a period before the determination time or a time period; and Based on a third reference radio wave intensity that is included in one or more reference receivers and is received by a third reference receiver different from the pass detection receiver, A fourth determination process is performed to determine whether the vicinity of the detection receiver has been passed,
In the fourth determination process, if it is determined in the third period that the mobile body has not passed near the passage detection receiver, the determination target is determined regardless of the result of the first determination process. The detection system according to any one of claims 1 to 4, wherein it is determined that the moving body has not entered the target area during the period or time. The detection system determines that the detection signal entering from outside the space is detected by the detection receiver when the second reference radio wave intensity in the first period is less than the first threshold. The detection system according to any one of claims 1 to 5. The moving body is a person;
The detection system according to claim 1, wherein the space is a building. 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;
One or more reference receivers to assist 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 an area in the space in the vicinity of the outlet or the inlet including the outlet or the inlet, and is disposed in a target area that is a detection target area of the moving body, Receive the detection signal,
The one or more reference receivers are arranged in the space and receive the detection signal;
The detection method is:
The target radio wave intensity that is the received radio wave intensity of the detection signal received by the detection receiver during the determination target period or time, and the first or more reference receivers included in the determination target period or time A first determination is made as to whether or not the mobile object has entered the target region during the determination target period or time based on a first reference radio wave intensity that is a radio field intensity of the detection signal received by a reference receiver. Judgment processing,
In the first period including the period to be determined or the period before the time, the detection is included in the one or more reference receivers and received by a second reference receiver that is the same as or different from the first reference receiver. A second determination process for determining whether a second reference radio wave intensity, which is a received radio wave intensity of the signal, is equal to or higher than a predetermined first threshold;
If it is determined in the second determination process that the second reference radio wave intensity in the first period is less than the first threshold, the determination target period or time regardless of the result of the first determination process A detection method for determining that the moving body has not entered the target area.

Images