WO2018167985A1 - Detection system and detection method - Google Patents

Detection system and detection method Download PDF

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Publication number
WO2018167985A1
WO2018167985A1 PCT/JP2017/011061 JP2017011061W WO2018167985A1 WO 2018167985 A1 WO2018167985 A1 WO 2018167985A1 JP 2017011061 W JP2017011061 W JP 2017011061W WO 2018167985 A1 WO2018167985 A1 WO 2018167985A1
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WO
WIPO (PCT)
Prior art keywords
detection signal
transmitter
signal
detection
receiver
Prior art date
Application number
PCT/JP2017/011061
Other languages
French (fr)
Japanese (ja)
Inventor
覚 大浦
久志 本川
Original Assignee
株式会社ベイビッグ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社ベイビッグ filed Critical 株式会社ベイビッグ
Priority to PCT/JP2017/011061 priority Critical patent/WO2018167985A1/en
Priority to JP2017541737A priority patent/JP6439160B1/en
Publication of WO2018167985A1 publication Critical patent/WO2018167985A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/01—Determining conditions which influence positioning, e.g. radio environment, state of motion or energy consumption
    • G01S5/019—Energy consumption
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/14—Receivers specially adapted for specific applications
    • G01S19/17—Emergency applications
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/34—Power consumption
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/04—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using a single signalling line, e.g. in a closed loop

Definitions

  • the present invention relates to a detection system and a detection method for detecting a moving object.
  • Patent Document 1 discloses that an RFID terminal held by a moving body transmits identification information signals at a plurality of types of frequencies. Thereby, detection accuracy can be improved.
  • the detection range or detection accuracy can be improved.
  • the transmitter and the like held by the mobile body mainly use a battery as a power source, it is desired to save power for a longer life.
  • an object of the present invention is to provide a detection system or a detection method capable of improving a detection range or detection accuracy while suppressing an increase in power consumption.
  • the detection system which concerns on 1 aspect of this invention is a detection system for detecting a mobile body, Comprising: The transmitter hold
  • the receiver receives the first detection signal
  • the receiver wirelessly transmits a first confirmation signal indicating that the first detection signal has been received to the transmitter, and the transmitter
  • the transmitter When the first confirmation signal is received, wireless transmission of the first detection signal is continued, and when the first confirmation signal cannot be received, the second communication range is wider than the first detection signal.
  • a detection signal is wirelessly transmitted.
  • the detection system can improve the detection range or the detection accuracy by using two types of detection signals having different communication ranges. Furthermore, the detection system transmits a second detection signal when the first detection signal is not received. Thereby, since it can suppress that the 2nd signal for a detection is transmitted unnecessarily, the power saving of a transmitter is realizable.
  • Wireless transmission of the second detection signal may be stopped.
  • the detection system continues to transmit the first detection signal even when the first detection signal is not received. Thereby, when the transmitter approaches the receiver, detection using the first detection signal can be resumed immediately. Further, the detection system can easily stop the transmission of the second detection signal based on the determination as to whether or not the first confirmation signal has been received.
  • the receiver when the receiver receives the second detection signal, the receiver wirelessly transmits a second confirmation signal indicating that the second detection signal has been received to the transmitter, and the transmitter transmits the second detection signal.
  • the two confirmation signals can be received, both the first detection signal and the second detection signal are wirelessly transmitted, and when both the second confirmation signals cannot be received, the first detection signal
  • the second detection signal may be wirelessly transmitted without wirelessly transmitting.
  • the detection system can suppress unnecessary transmission of the first detection signal, thereby realizing power saving of the transmitter. Further, the detection system can easily stop the transmission of the first detection signal based on the determination as to whether or not the second confirmation signal has been received.
  • the transmitter wirelessly transmits the first detection signal at a first interval.
  • the transmitter fails to receive the first confirmation signal, the transmitter transmits the first detection signal. May be transmitted wirelessly at a second interval longer than the first interval.
  • the detection system can reduce the transmission frequency of the first detection signal that is uncertain whether it is received or not, the power saving of the transmitter can be realized.
  • the transmitter wirelessly transmits the second detection signal at a third interval
  • the second detection signal May be transmitted wirelessly at a fourth interval longer than the third interval
  • the detection system can reduce the transmission frequency of the second detection signal for which it is uncertain whether it will be received or not, thereby realizing power saving of the transmitter.
  • the transmitter may wirelessly transmit the second detection signal at a third interval longer than the first interval.
  • the detection system can reduce the transmission frequency of the second detection signal, power saving of the transmitter can be realized.
  • the first detection signal may be a first wavelength band
  • the second detection signal may be a second wavelength band longer than the first wavelength band
  • the detection system can improve the detection range or the detection accuracy by using two types of detection signals having different wavelength bands.
  • the first detection signal and the first confirmation signal may be in a first wavelength band, and the first detection signal and the second confirmation signal may be in a second wavelength band that is longer than the first wavelength band. Good.
  • the confirmation signal can be accurately transmitted to the transmitter.
  • the receiver may wirelessly transmit the first confirmation signal to the transmitter when the received radio wave intensity of the first detection signal is higher than a predetermined threshold.
  • the detection accuracy near the boundary of the communication range of the first detection signal can be improved.
  • a detection method is a detection method in a detection system for detecting a moving body, and the detection system includes a transmitter and a receiver held by the mobile body.
  • the transmitter wirelessly transmits a first detection signal
  • the receiver receives the first detection signal when the receiver receives the first detection signal.
  • the detection method can improve the detection range or the detection accuracy by using two types of detection signals having different communication ranges. Furthermore, the detection system transmits a second detection signal when the first detection signal is not received. Thereby, since it can suppress that the 2nd signal for a detection is transmitted unnecessarily, the power saving of a transmitter is realizable.
  • the present invention can provide a detection system or a detection method capable of improving the detection range or detection accuracy while suppressing an increase in power consumption.
  • FIG. 1 is a diagram illustrating a configuration of a detection system according to an embodiment.
  • FIG. 2 is a block diagram of the transmitter according to the embodiment.
  • FIG. 3 is a block diagram of a receiver according to the embodiment.
  • FIG. 4 is a block diagram of the management apparatus according to the embodiment.
  • FIG. 5 is a diagram illustrating the operation of the detection system according to the embodiment.
  • FIG. 6 is a diagram illustrating a configuration example of a detection signal according to the embodiment.
  • FIG. 7 is a diagram illustrating a configuration example of a notification signal according to the embodiment.
  • FIG. 8 is a diagram illustrating an example of a positional relationship between the transmitter and the receiver according to the embodiment.
  • FIG. 9 is a diagram illustrating an operation performed by the transmitter according to the embodiment.
  • FIG. 10 is a flowchart showing the operation of the transmitter according to the embodiment.
  • FIG. 11 is a flowchart illustrating the operation of the receiver according to the embodiment.
  • the transmitter switches the frequency band of the detection signal to be transmitted depending on whether the detection signal transmitted by itself is received by the receiver.
  • the said detection system can improve a detection range or a detection precision, suppressing the increase in power consumption.
  • FIG. 1 is a diagram showing a configuration of a detection system 100 according to the present embodiment.
  • a detection system 100 shown in FIG. 1 is a system for detecting a moving object, and includes a management device 102, a plurality of receivers 103, and a plurality of transmitters 104.
  • the detection system 100 is used to detect the position of a child or an elderly person.
  • the detection system 100 is used in a school road, around a housing complex, a nursing home or a nursing facility.
  • this detection system 100 may be used for detecting the position of a visitor in a facility such as an amusement park or a theme park.
  • Each of the plurality of transmitters 104 is held (carried or worn) by a moving body (for example, a child or an elderly person) who is a monitoring target.
  • the transmitter 104 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.
  • the transmitter 104 may be a name tag type or the like.
  • the moving object to be monitored is not limited to a person, but may be an animal or a movable machine.
  • the transmitter 104 periodically transmits one or both of the detection signal 151A and the detection signal 151B by radio.
  • the detection signals 151A and 151B are radio signals that comply with, for example, IEEE 802.15.4.
  • the detection signal 151A is a 2.4 GHz band radio signal
  • the detection signal 151B is a 920 MHz band or 950 MHz band radio signal.
  • An LPWA (Low Power, Wide Area) radio signal may be used as the detection signal 151B.
  • 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.
  • the detection signals 151A and 151B may have different communication ranges (reach distances). That is, it is only necessary that the communication range of the detection signal 151B is wider than the communication range of the detection signal 151B.
  • the transmission output (output radio wave intensity) of the detection signal 151B may be made higher than the transmission output (output radio wave intensity) of the detection signal 151A.
  • communication systems having different reach distances such as FSK (frequency modulation system) and spread spectrum system such as LoRa standard may be used.
  • the plurality of receivers 103 are arranged in a monitored area (for example, a school road, a park, or a facility), and receive the detection signals 151A or 151B that are periodically transmitted from the transmitter 104 by radio. It should be noted that at least a part of the plurality of receivers 103 may be carried by a supervisor (for example, facility staff) or the like. That is, each of the plurality of receivers 103 may be fixedly installed or may be held by a moving body.
  • a supervisor for example, facility staff
  • the receiver 103 When the receiver 103 receives the detection signal 151A or 151B, the receiver 103 notifies the management apparatus 102 that the detection signal 151A or 151B has been detected. Specifically, the receiver 103 transmits to the management apparatus 102 a notification signal 153 indicating that the detection signal 151A or 151B has been detected.
  • the communication method between the receiver 103 and the management apparatus 102 is not particularly limited. For example, a public telephone network, an Internet line (including a wireless or wired LAN, Wi-Fi (registered trademark), etc.), or an original A wired or wireless network can be used.
  • a plurality of receivers 103 may construct a wireless network, and the notification signal 153 may be transmitted via the wireless network.
  • the plurality of receivers 103 include a reception master unit and a reception slave unit.
  • the signal wirelessly transmitted from the receiver unit is transmitted to the receiver unit directly or via one or more receiver units or a dedicated repeater.
  • the receiving master that has received the signal transmits the signal to the management apparatus 102 via the network.
  • the frequency band and communication method of the wireless signal used in this wireless network may be the same as or different from the frequency band and communication method of the detection signal 151A or 151B.
  • the management device 102 is, for example, a PC (personal computer).
  • the management apparatus 102 receives the notification signal 153 transmitted from the receiver 103, and detects the position of the monitoring target person using information included in the notification signal 153. In addition, the management apparatus 102 displays position information indicating the position of the monitoring target person.
  • FIG. 2 is a block diagram showing the configuration of the transmitter 104.
  • the transmitter 104 includes a first wireless communication unit 111, a second wireless communication unit 112, a control unit 113, a transmitter ID storage unit 114, and a power supply unit 115.
  • the first wireless communication unit 111 periodically transmits the detection signal 151A wirelessly. Further, the first wireless communication unit 111 receives the confirmation signal 152A wirelessly transmitted from the receiver 103.
  • the second wireless communication unit 112 periodically transmits the detection signal 151B wirelessly. Further, the second wireless communication unit 112 receives the confirmation signal 152B wirelessly transmitted from the receiver 103.
  • the wavelength bands of the detection signal 151B and the confirmation signal 152B are longer than the wavelength bands of the detection signal 151A and the confirmation signal 152A. That is, the communicable range (radio wave reachable distance) of the detection signals 151B and 152B is longer than the communicable range (radio wave reachable distance) of the detection signals 151A and 152A.
  • the detection signal 151A and the confirmation signal 152A are wireless signals in the 2.4 GHz band
  • the detection signal 151B and the confirmation signal 152B are wireless signals in the 920 MHz band or the 950 MHz band.
  • the control unit 113 controls the first wireless communication unit 111 and the second wireless communication unit 112.
  • the transmitter ID storage unit 114 stores a transmitter ID (transmitter identifier) 161A, which is information for uniquely identifying the transmitter 104.
  • the power supply unit 115 is a power supply that supplies power to the transmitter 104, and is, for example, a battery or a battery. That is, the transmitter 104 can be operated only by power supply from the inside (or power generated inside) without receiving power supply from the outside.
  • FIG. 3 is a block diagram illustrating a configuration of the receiver 103.
  • the receiver 103 includes a first wireless communication unit 121, a second wireless communication unit 122, a position measurement unit 123, a control unit 124, and a communication unit 125.
  • the first wireless communication unit 121 receives the detection signal 151A wirelessly transmitted from the transmitter 104.
  • the first wireless communication unit 121 transmits a confirmation signal 152A indicating that the detection signal 151A has been received, to the transmitter 104 that is the transmission source of the detection signal 151A.
  • the second wireless communication unit 122 receives the detection signal 151B wirelessly transmitted from the transmitter 104.
  • the second wireless communication unit 122 transmits a confirmation signal 152B indicating that the detection signal 151B has been received to the transmitter 104 that is the transmission source of the detection signal 151B.
  • the position measuring unit 123 measures the position where the receiver 103 is arranged.
  • the position measuring unit 123 has a GPS (Global Positioning System) function, and measures the position where the receiver 103 is arranged using the GPS function. Note that the receiver 103 may not include the position measurement unit 123.
  • GPS Global Positioning System
  • the control unit 124 generates the notification signal 153 when the detection signal 151A or 151B is received. In addition, the control unit 124 controls the first wireless communication unit 121 and the second wireless communication unit 122.
  • the communication unit 125 transmits a notification signal 153 to the management apparatus 102.
  • the function of the receiver 103 may be realized by a plurality of devices obtained by dividing the function by function or signal processing.
  • FIG. 4 is a block diagram illustrating a configuration of the management apparatus 102.
  • the management device 102 includes a communication unit 131, a receiver position storage unit 132, a position information generation unit 133, and a display unit 134.
  • the communication unit 131 receives the notification signal 153 transmitted from the receiver 103.
  • the receiver position storage unit 132 stores the positions of the plurality of receivers 103.
  • the receiver position storage unit 132 stores information indicating the position of the receiver 103 included in the notification signal 153 or information indicating the position of the receiver 103 sent in advance from the receiver 103.
  • the receiver position storage unit 132 may store information indicating the positions of the plurality of receivers 103 input in advance by a user operation or the like.
  • the position information generation unit 133 generates position information indicating the position of the transmitter 104 using the information included in the notification signal 153.
  • the display unit 134 displays position information.
  • the configuration of the detection system 100 is not limited to the configuration shown in FIG.
  • the detection system 100 may include a plurality of management devices 102.
  • some of the plurality of management devices 102 may be mobile terminals (for example, smartphones) carried by facility staff or guardians.
  • the function of the management apparatus 102 may be realized by a plurality of devices.
  • a part of the function of the management apparatus 102 may be realized by a PC, and the other part may be realized by a smartphone carried by a guardian.
  • the position information is generated by a device (for example, a PC), and the generated position information is transmitted to another device (for example, a smartphone) via a network or the like. It may be displayed.
  • the receiver 103 may have at least a part of the function of the management apparatus 102, or the management apparatus 102 may have at least a part of the function of the receiver 103.
  • the receiver 103 has all the functions of the management device 102, and the detection system 100 may not include the management device 102.
  • the management apparatus 102 and the receiver 103 are realized as a single device, signal transmission between the management apparatus 102 and the receiver 103 is performed within the device.
  • the transmission of the notification signal 153 described above includes not only transmission between devices via a network or the like but also transmission of signals within the device.
  • FIG. 5 is a diagram illustrating the operation of the detection system 100.
  • the transmitter 104 periodically transmits the detection signal 151A or 151B (S101).
  • FIG. 6 is a diagram showing a configuration of the detection signal 151A.
  • the configuration of the detection signal 151B is the same.
  • the detection signal 151 ⁇ / b> A includes a transmitter ID 161 ⁇ / b> A for identifying the transmission source transmitter that is the transmission source 104 of the detection signal 151 ⁇ / b> A.
  • the detection signals 151A and 151B may include information other than the above.
  • the detection signals 151A and 151B may include the identification number of the detection signal 151A or 151B.
  • the identification number is a serial number that is incremented by 1 each time the transmitter 104 transmits the detection signal 151A or 151B.
  • the detection signals 151A and 151B may include information indicating whether the signal is the detection signal 151A or the detection signal 151B. For example, when only the transmission output of the detection signals 151A and 151B is changed, this information is included in the detection signals 151A and 151B.
  • the receiver 103 that has received the detection signal 151A or 151B transmits to the management apparatus 102 a notification signal 153 indicating that the detection signal 151A or 151B has been received (S102).
  • FIG. 7 is a diagram showing the configuration of the notification signal 153.
  • notification signal 153 includes transmitter ID 161 ⁇ / b> B, receiver ID 162, received radio wave intensity information 163, and receiver position information 164.
  • the transmitter ID 161B indicates the transmitter 104 that is the transmission source of the detection signal 151A or 151B.
  • transmitter ID 161B is the same ID as transmitter ID 161A included in detection signal 151A or 151B.
  • the receiver ID 162 is the receiver 103 that has received the detection signal 151 ⁇ / b> A or 151 ⁇ / b> B, and indicates the receiver 103 that has transmitted the notification signal 153.
  • the received radio wave intensity information 163 indicates the received radio wave intensity of the detection signal 151A or 151B received by the receiver 103.
  • the receiver position information 164 indicates the current position of the receiver 103.
  • the receiver position information 164 is position information of the receiver 103 measured by GPS or the like that the receiver 103 has. If the receiver 103 is a stationary device, the receiver position information 164 may not be included in the notification signal 153.
  • the notification signal 153 may include information other than the above.
  • the notification signal 153 may include information indicating the time when the detection signal 151A or 151B is received.
  • the notification signal 153 may include information indicating whether the received detection signal is the detection signal 151A, the detection signal 151B, or both.
  • the receiver 103 transmits a confirmation signal 152A or 152B indicating that the detection signal 151A or 151B has been received to the transmitter 104 that is the transmission source of the detection signal 151A or 151B.
  • the confirmation signal 152A or 152B includes the transmitter ID 161A of the transmitter 104 that is the transmission source of the detection signal 151A or 151B.
  • the confirmation signal 152A or 152B may not include the transmitter ID 161A.
  • the transmission order of the notification signal 153 and the confirmation signal 152A or 152B may be arbitrary.
  • the management apparatus 102 that has received the notification signal 153 generates position information indicating the position of the transmitter 104 by using the received notification signals 153 (S104).
  • the position information generation unit 133 uses the reception radio wave intensity of the detection signal 151A or 151B in the receiver 103 indicated by the reception radio wave intensity information 163 included in the notification signal 153, and the position of the receiver 103.
  • the position of the transmitter 104 is calculated.
  • the position of the vessel 103 is used as the position of the receiver 103.
  • the position information generation unit 133 can determine the position of the transmitter 104 from the received radio wave intensity and the position of the receiver 103 with respect to the plurality of receivers 103.
  • the position information generation unit 133 is based on only information indicating whether or not each of the receivers 103 has received the detection signal 151A or 151B (or information indicating whether or not the received radio wave intensity is equal to or greater than a predetermined threshold).
  • the position of the transmitter 104 may be detected. That is, the position information generation unit 133 may not use the received radio wave intensity information 163.
  • the position information may be information indicating the receiver 103 that has received the detection signal 151A or 151B.
  • the position information generation unit 133 may not use the position information of the receiver 103.
  • a staff member who carries the receiver 103 for example, a smartphone
  • position measurement using GPS cannot be performed.
  • the position information generation unit 133 determines whether or not each of the receivers 103 can receive the detection signal 151A or 151B as the position information. Only the information indicating the receiver 103 that has received the detection signal 151A or 151B may be generated.
  • the position information generation unit 133 generates information for detecting the position of the transmitter 104 based on the notification signal 153.
  • FIG. 8 is a diagram showing a positional relationship between the transmitter 104 and the receiver 103.
  • FIG. 8A shows a state in which the receiver 103 exists in the communication range 171A of the detection signal 151A (short wavelength).
  • FIG. 8B shows a state in which the receiver 103 exists outside the communication range 171A of the detection signal 151A (short wavelength) and within the communication range 171B of the detection signal 151B (long wavelength).
  • FIG. 8C illustrates a state where the receiver 103 exists outside the communication range 171B of the detection signal 151B (long wavelength).
  • FIG. 9 is a diagram showing the operation of the transmitter 104 in each state shown in (a) to (c) of FIG. As shown in FIG. 9A, when the receiver 103 is within the communication range 171A of the detection signal 151A (short wavelength), the transmitter 104 transmits the detection signal 151A (short wavelength), The detection signal 151B (long wavelength) is not transmitted.
  • the transmitter 104 transmits both the detection signal 151A (short wavelength) and the detection signal 151B (long wavelength).
  • the transmitter 104 does not transmit the detection signal 151A (short wavelength).
  • the detection signal 151B (long wavelength) is transmitted.
  • FIG. 10 is a flowchart showing a processing flow of the transmitter 104.
  • the transmitter 104 transmits a detection signal 151A (short wavelength) (S111).
  • a detection signal 151A short wavelength
  • the transmitter 104 transmits the detection signal 151A again at a predetermined interval (S111). That is, the transmitter 104 continues to transmit the detection signal 151A.
  • the transmitter 104 when the transmitter 104 cannot receive the confirmation signal 152A for the detection signal 151A from the receiver 103 (No in S112), the transmitter 104 receives the detection signal 151A (short wavelength) and the detection signal 151B (long wavelength). Both are transmitted (S113). That is, the transmitter 104 shifts from the first state in which only the detection signal 151A is transmitted to the second state in which both the detection signal 151A and the detection signal 151B are transmitted.
  • the transmitter 104 shifts to the first state in which only the detection signal 151A is transmitted (S111). ). That is, the transmitter 104 continues to transmit the detection signal 151A and stops transmitting the detection signal 151B.
  • the transmitter 104 cannot receive the confirmation signal 152A for the detection signal 151A from the receiver 103 and can receive the confirmation signal 152B for the detection signal 151B from the receiver 103 (S114). No, and Yes in S115), the transmission of the detection signal 151A and the detection signal 151B is continued (S113). That is, the transmitter 104 continues the second state.
  • the transmitter 104 cannot receive the confirmation signal 152A for the detection signal 151A and the confirmation signal 152B for the detection signal 151B from the receiver 103 (No in S114, and S115). No), a transition is made to the third state in which only the detection signal 151B is transmitted (S116). That is, the transmitter 104 continues to transmit the detection signal 151B and stops transmitting the detection signal 151A.
  • the transmitter 104 when the transmitter 104 cannot receive the confirmation signal 152B for the detection signal 151B from the receiver 103 in the third state (No in S115), the transmitter 104 continues the third state in which only the detection signal 151B is transmitted (S116). ). On the other hand, when the transmitter 104 has received the confirmation signal 152B for the detection signal 151B from the receiver 103 in the third state (Yes in S115), the transmitter 104 transmits both the detection signal 151A and the detection signal 151B. The state is changed (S113).
  • FIG. 11 is a flowchart showing a processing flow of the receiver 103.
  • the receiver 103 when the receiver 103 receives the detection signal 151A (short wavelength) (Yes in S121), the receiver 103 transmits the confirmation signal 152A (short wavelength) to the transmitter 104 of the detection signal 151A. (S122). Further, when receiving the detection signal 151B (long wavelength) (Yes in S123), the receiver 103 wirelessly transmits the confirmation signal 152B (long wavelength) to the transmitter 104 that is the transmission source of the detection signal 151B ( S124).
  • the transmitter 104 wirelessly transmits the detection signal 151A, and when the receiver 103 receives the detection signal 151A, it indicates that the detection signal 151A has been received.
  • the confirmation signal 152A is wirelessly transmitted to the transmitter 104.
  • the transmitter 104 receives the confirmation signal 152A, the transmitter 104 continues to wirelessly transmit the detection signal 151A.
  • the transmitter 104 wirelessly transmits the detection signal 151B having a wider communication range than the detection signal 151A. To do.
  • the detection system 100 can improve the detection range or the detection accuracy by using two types of detection signals 151A and 151B having different wavelength bands. Specifically, by using the detection signal 151A having a narrow communication range, highly accurate position detection can be realized in an area where a plurality of receivers 103 exist densely.
  • the detection signal 151B having a wide communication range, the detection can be continued without losing sight of the position of the transmitter 104 even in an area where a plurality of receivers 103 exist sparsely.
  • highly accurate detection can be realized by the detection signal 151A, and the detection signal 151B can be used even in a place where the arrangement intervals of the receivers 103 are wide, such as outdoors. Detection can be continued.
  • the speed search can be realized by using the detection signal 151B having a wide communication range.
  • the detection system 100 transmits the detection signal 151B when the detection signal 151A is not received. Thereby, since it is possible to suppress the detection signal 151A from being transmitted unnecessarily, power saving of the transmitter 104 can be realized.
  • the transmitter 104 wirelessly transmits both the detection signal 151A and the detection signal 151B and receives the confirmation signal 152A. In this case, the wireless transmission of the detection signal 151B is stopped.
  • the detection system 100 continues to transmit the detection signal 151A even when the detection signal 151A is not received. Thereby, when the transmitter 104 approaches the receiver 103, the detection using the detection signal 151A can be resumed immediately. Further, the detection system 100 can easily stop the transmission of the detection signal 151B based on the determination as to whether or not the confirmation signal 152A has been received.
  • the receiver 103 when the receiver 103 receives the detection signal 151B, the receiver 103 wirelessly transmits a confirmation signal 152B to the transmitter 104 indicating that the detection signal 151B has been received. Send.
  • the transmitter 104 wirelessly transmits both the detection signal 151A and the detection signal 151B when receiving the confirmation signal 152B, and wirelessly transmits the detection signal 151A when both the confirmation signal 152B cannot be received. Without detection, the detection signal 151B is wirelessly transmitted.
  • the detection system 100 is less likely to receive the detection signal 151A.
  • the detection signal 151A is unnecessarily transmitted. Can be suppressed. Therefore, power saving of the transmitter 104 can be realized. Further, the detection system 100 can easily stop the transmission of the detection signal 151A based on the determination as to whether or not the confirmation signal 152B has been received.
  • FIG. 9 shows an example in which the detection signal 151A is not transmitted when the receiver 103 is outside the communication range of the detection signal 151B. However, even in this case, the detection signal 151A is transmitted. Good. This eliminates the need for switching whether or not to transmit the detection signal 151A, and thus simplifies the processing.
  • various operations are switched depending on whether or not the transmitter 104 can receive the confirmation signal 152A or 152B.
  • the received radio wave intensity of the confirmation signal 152A or 152B in the transmitter 104 is greater than or equal to the threshold value.
  • Various operations may be switched depending on whether or not there is.
  • the transmitter 104 when the transmitter 104 receives the confirmation signal 152A (FIG. 9A), the transmitter 104 wirelessly transmits the detection signal 151A at an interval T1, When the confirmation signal 152A cannot be received ((b) of FIG. 9), the detection signal 151A is wirelessly transmitted at an interval T2 longer than the interval T1.
  • the detection system 100 can reduce the transmission frequency of the detection signal 151A whether reception is uncertain, the power saving of the transmitter 104 can be realized.
  • the transmitter 104 when the transmitter 104 receives the confirmation signal 152B (FIG. 9B), the transmitter 104 wirelessly transmits the detection signal 151B at an interval T3.
  • the detection signal 151B is wirelessly transmitted at an interval T4 longer than the interval T3.
  • the detection system 100 can reduce the transmission frequency of the detection signal 151B that is uncertain whether it is received or not, the power saving of the transmitter 104 can be realized.
  • the detection signal 151B is separated from the interval T1 by the interval T3. Send wirelessly.
  • the detection system 100 can reduce the transmission frequency of the detection signal 151B, the power saving of the transmitter 104 can be realized.
  • the situation where the detection signal 151B is transmitted may be a situation where a lost child, a deceased person, a victim, or the like is searched. With the above operation, the battery can be prevented from running out in such a situation.
  • the transmission interval shown in FIG. 9 is an example, and the present embodiment is not limited to this.
  • the transmission interval of the detection signal 151A in each state may be the same.
  • the transmission interval of the detection signal 151B in each state may be the same.
  • the transmission intervals of the detection signal 151A and the detection signal 151B may be the same.
  • the transmission interval of the detection signal 151B may be shorter than the transmission interval of the detection signal 151A. Therefore, the detection accuracy in the case of searching for a lost child, a deceased person, a victim, etc. can be improved.
  • the interval T2 may be shorter than the interval T1. Thereby, the detection accuracy in the case of searching for a lost child, a deceased person, a victim, or the like can be improved.
  • the interval T4 may be shorter than the interval T3.
  • the detection signal 151 ⁇ / b> A and the detection signal 151 ⁇ / b> B are transmitted in synchronization, but may not be synchronized. Further, the transmission timing of the detection signal 151A and the detection signal 151B may be intentionally shifted.
  • the first state in which only the detection signal 151A is transmitted via the second state in which both the detection signal 151A and the detection signal 151B are transmitted, and only the detection signal 151B is transmitted.
  • the transmitted third state is switched, the first state and the third state may be switched without going through the second state.
  • the transmitter 104 transits to the third state in which only the detection signal 151B is transmitted.
  • the transmitter 104 detects the received radio wave intensity of the confirmation signal 152B, and when the received radio wave intensity is higher than the threshold (that is, when the transmitter 104 and the receiver 103 are assumed to be close to each other). ), A transition may be made to the first state in which only the detection signal 151A is transmitted.
  • the transition from one state to the other state is via the second state, and the transition from the other state to the one state is It is not necessary to go through the second state.
  • the transmitter 104 cannot receive the confirmation signal 152A in the first state, the transmitter 104 transits to the third state in which only the detection signal 151B is transmitted.
  • the transmitter 104 transitions to the second state in which both the detection signal 151A and the detection signal 151B are transmitted, and the confirmation signal 152A in the second state. May be transferred to the first state in which only the detection signal 151A is transmitted.
  • the receiver 103 transmits the confirmation signal 152A when the detection signal 151A is received. However, the receiver 103 determines whether or not the received radio wave intensity of the detection signal 151A is equal to or higher than the threshold value.
  • the confirmation signal 152A may be transmitted when the received signal strength of the signal for use 151A is greater than or equal to the threshold value, and the confirmation signal 152A may not be transmitted when the received signal strength of the signal for detection 151A is less than the threshold value.
  • both the detection signals 151A and 151B are transmitted when the distance between the transmitter 104 and the receiver 103 approaches the boundary of the communication range of the detection signal 151A.
  • the threshold value is higher than a criterion for determining whether or not the detection signal 151A has been received. In other words, even when the receiver 103 can receive the detection signal 151A, the receiver 103 does not transmit the confirmation signal 152A if the received radio wave intensity of the detection signal 151 is less than the threshold.
  • each processing unit included in each device included in the detection system according to the above 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.
  • circuits are not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor.
  • An FPGA Field Programmable Gate Array
  • reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used.
  • each device included in the detection system may be realized by a processor such as a CPU executing a program.
  • the present invention may be the above program or a non-transitory computer-readable recording medium on which the above program is recorded.
  • the program can be distributed via a transmission medium such as the Internet.
  • the present invention can be realized not only as a detection system but also as a transmitter, a receiver, or a management device included in the detection system.
  • 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. .
  • 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.
  • functions of a plurality of functional blocks having similar functions may be processed in parallel or time-division by a single hardware or software.
  • the detection system according to one or more aspects has been described based on the embodiment, but 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.

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Abstract

A detection system (100) is a system for detecting a mobile body, said detection system including a transmitter (104) held by the mobile body, and a receiver (103). The transmitter (104) transmits a first detection signal (151A) in a wireless manner, the receiver (103) transmits, in a wireless manner, a first confirmation signal (152A) to the transmitter (104) in the cases where the receiver received the first detection signal (151A), said first confirmation signal indicating that the first detection signal (151A) has been received, and the transmitter (104) continues the wireless transmission of the first detection signal (151A) in the cases where the transmitter received the first confirmation signal (152A), and in the cases where the transmitter could not receive the first confirmation signal (152A), the transmitter transmits, in the wireless manner, a second detection signal (151B) having a communication range that is wider than that of the first detection signal (151A).

Description

検知システム及び検知方法Detection system and detection method
　本発明は、移動体を検知する検知システム及び検知方法に関する。 The present invention relates to a detection system and a detection method for detecting a moving object.
　近年、高齢者の増加にともない、病院、介護施設又は養護施設等における患者又は入居者の管理が問題となっている。このような入居者には、認知症患者も含まれ、徘徊により行方不明になる場合もある。 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 people with dementia and may be missing due to wrinkles.
　一方、特許文献１には、移動体が保持するＲＦＩＤ端末が、複数種類の周波数で識別情報信号を送信することが開示されている。これにより、検知精度を向上できる。 On the other hand, Patent Document 1 discloses that an RFID terminal held by a moving body transmits identification information signals at a plurality of types of frequencies. Thereby, detection accuracy can be improved.
国際公開第２００６／０９２８５８号International Publication No. 2006/092858
　このようなシステムでは、検知範囲又は検知精度を向上できることが望まれている。その一方で、移動体が保持する発信器等は、主にバッテリーを電力源とするため、長寿命化のための省電力化が望まれる。 In such a system, it is desired that the detection range or detection accuracy can be improved. On the other hand, since the transmitter and the like held by the mobile body mainly use a battery as a power source, it is desired to save power for a longer life.
　そこで、本発明は、消費電力の増加を抑制しつつ、検知範囲又は検知精度を向上できる検知システム又は検知方法を提供することを目的とする。 Therefore, an object of the present invention is to provide a detection system or a detection method capable of improving a detection range or detection accuracy while suppressing an increase in power consumption.
　本発明の一態様に係る検知システムは、移動体を検知するための検知システムであって、前記移動体に保持される発信器と、受信器とを含み、前記発信器は、第１検知用信号を無線送信し、前記受信器は、前記第１検知用信号を受信した場合、当該第１検知用信号を受信したことを示す第１確認信号を前記発信器に無線送信し、前記発信器は、前記第１確認信号を受信した場合、前記第１検知用信号の無線送信を継続し、前記第１確認信号を受信できなかった場合、前記第１検知用信号より通信範囲が広い第２検知用信号を無線送信する。 The detection system which concerns on 1 aspect of this invention is a detection system for detecting a mobile body, Comprising: The transmitter hold | maintained at the said mobile body, and a receiver, The said transmitter is for 1st detection. When the receiver receives the first detection signal, the receiver wirelessly transmits a first confirmation signal indicating that the first detection signal has been received to the transmitter, and the transmitter When the first confirmation signal is received, wireless transmission of the first detection signal is continued, and when the first confirmation signal cannot be received, the second communication range is wider than the first detection signal. A detection signal is wirelessly transmitted.
　この構成によれば、当該検知システムは、通信範囲の異なる二種類の検知用信号を用いることで、検知範囲又は検知精度を向上できる。さらに、当該検知システムは、第１検知用信号が受信されなかった場合に、第２検知用信号を送信する。これにより、不必要に第２検知用信号が送信されることを抑制できるので、発信器の省電力化を実現できる。 According to this configuration, the detection system can improve the detection range or the detection accuracy by using two types of detection signals having different communication ranges. Furthermore, the detection system transmits a second detection signal when the first detection signal is not received. Thereby, since it can suppress that the 2nd signal for a detection is transmitted unnecessarily, the power saving of a transmitter is realizable.
　例えば、前記発信器は、前記第１確認信号を受信できなかった場合、前記第１検知用信号と前記第２検知用信号との両方を無線送信し、前記第１確認信号を受信した場合、前記第２検知用信号の無線送信を停止してもよい。 For example, if the transmitter fails to receive the first confirmation signal, wirelessly transmits both the first detection signal and the second detection signal, and receives the first confirmation signal, Wireless transmission of the second detection signal may be stopped.
　この構成によれば、当該検知システムは、第１検知用信号が受信されなかった場合にも、第１検知用信号の送信を継続する。これにより、発信器が受信器に近づいた際に、直ちに第１検知用信号を用いた検知を再開できる。また、当該検知システムは、第１確認信号を受信できたか否かの判断に基づき、容易に第２検知用信号の送信を停止できる。 According to this configuration, the detection system continues to transmit the first detection signal even when the first detection signal is not received. Thereby, when the transmitter approaches the receiver, detection using the first detection signal can be resumed immediately. Further, the detection system can easily stop the transmission of the second detection signal based on the determination as to whether or not the first confirmation signal has been received.
　例えば、前記受信器は、前記第２検知用信号を受信した場合、当該第２検知用信号を受信したことを示す第２確認信号を前記発信器に無線送信し、前記発信器は、前記第２確認信号を受信できた場合、前記第１検知用信号と前記第２検知用信号との両方を無線送信し、前記第２確認信号の両方を受信できなかった場合、前記第１検知用信号を無線送信せず、前記第２検知用信号を無線送信してもよい。 For example, when the receiver receives the second detection signal, the receiver wirelessly transmits a second confirmation signal indicating that the second detection signal has been received to the transmitter, and the transmitter transmits the second detection signal. When the two confirmation signals can be received, both the first detection signal and the second detection signal are wirelessly transmitted, and when both the second confirmation signals cannot be received, the first detection signal The second detection signal may be wirelessly transmitted without wirelessly transmitting.
　この構成によれば、当該検知システムは、不必要に第１検知用信号が送信されることを抑制できるので、発信器の省電力化を実現できる。また、当該検知システムは、第２確認信号を受信できたか否かの判断に基づき、容易に第１検知用信号の送信を停止できる。 According to this configuration, the detection system can suppress unnecessary transmission of the first detection signal, thereby realizing power saving of the transmitter. Further, the detection system can easily stop the transmission of the first detection signal based on the determination as to whether or not the second confirmation signal has been received.
　例えば、前記発信器は、前記第１確認信号を受信した場合、前記第１検知用信号を第１間隔で無線送信し、前記第１確認信号を受信できなかった場合、前記第１検知用信号を前記第１間隔より長い第２間隔で無線送信してもよい。 For example, when the transmitter receives the first confirmation signal, the transmitter wirelessly transmits the first detection signal at a first interval. When the transmitter fails to receive the first confirmation signal, the transmitter transmits the first detection signal. May be transmitted wirelessly at a second interval longer than the first interval.
　この構成によれば、当該検知システムは、受信されるかが不確定な第１検知用信号の送信頻度を下げることができるので、発信器の省電力化を実現できる。 According to this configuration, since the detection system can reduce the transmission frequency of the first detection signal that is uncertain whether it is received or not, the power saving of the transmitter can be realized.
　例えば、前記発信器は、前記第２確認信号を受信した場合、前記第２検知用信号を第３間隔で無線送信し、前記第２確認信号を受信できなかった場合、前記第２検知用信号を前記第３間隔より長い第４間隔で無線送信してもよい。 For example, when the transmitter receives the second confirmation signal, the transmitter wirelessly transmits the second detection signal at a third interval, and when the transmitter fails to receive the second confirmation signal, the second detection signal May be transmitted wirelessly at a fourth interval longer than the third interval.
　この構成によれば、当該検知システムは、受信されるかが不確定な第２検知用信号の送信頻度を下げることができるので、発信器の省電力化を実現できる。 According to this configuration, the detection system can reduce the transmission frequency of the second detection signal for which it is uncertain whether it will be received or not, thereby realizing power saving of the transmitter.
　例えば、前記発信器は、前記第１確認信号を受信できなかった場合、前記第２検知用信号を前記第１間隔より長い第３間隔で無線送信してもよい。 For example, when the transmitter fails to receive the first confirmation signal, the transmitter may wirelessly transmit the second detection signal at a third interval longer than the first interval.
　この構成によれば、当該検知システムは、第２検知用信号の送信頻度を下げることができるので、発信器の省電力化を実現できる。 According to this configuration, since the detection system can reduce the transmission frequency of the second detection signal, power saving of the transmitter can be realized.
　例えば、前記第１検知用信号は、第１波長帯であり、前記第２検知用信号は、前記第１波長帯より長い第２波長帯であってもよい。 For example, the first detection signal may be a first wavelength band, and the second detection signal may be a second wavelength band longer than the first wavelength band.
　この構成によれば、当該検知システムは、波長帯の異なる二種類の検知用信号を用いることで、検知範囲又は検知精度を向上できる。 According to this configuration, the detection system can improve the detection range or the detection accuracy by using two types of detection signals having different wavelength bands.
　例えば、前記第１検知用信号及び第１確認信号は、第１波長帯であり、前記第１検知用信号及び第２確認信号は、前記第１波長帯より長い第２波長帯であってもよい。 For example, the first detection signal and the first confirmation signal may be in a first wavelength band, and the first detection signal and the second confirmation signal may be in a second wavelength band that is longer than the first wavelength band. Good.
　この構成によれば、確認信号を発信器に精度よく伝達できる。 こ の According to this configuration, the confirmation signal can be accurately transmitted to the transmitter.
　例えば、前記受信器は、前記第１検知用信号の受信電波強度が予め定められた閾値より高い場合に前記第１確認信号を前記発信器に無線送信してもよい。 For example, the receiver may wirelessly transmit the first confirmation signal to the transmitter when the received radio wave intensity of the first detection signal is higher than a predetermined threshold.
　この構成によれば、第１検知用信号の通信範囲の境界付近での検知精度を向上できる。 According to this configuration, the detection accuracy near the boundary of the communication range of the first detection signal can be improved.
　また、本発明の一態様に係る検知方法は、移動体を検知するための検知システムにおける検知方法であって、前記検知システムは、前記移動体に保持される発信器と、受信器とを含み、前記検知方法は、前記発信器が、第１検知用信号を無線送信するステップと、前記受信器が、前記第１検知用信号を受信した場合、当該第１検知用信号を受信したことを示す第１確認信号を前記発信器に無線送信するステップと、前記発信器が、前記第１確認信号を受信した場合、前記第１検知用信号の無線送信を継続するステップと、前記発信器が、前記第１確認信号を受信できなかった場合、前記第１検知用信号より通信範囲が広い第２検知用信号を無線送信するステップとを含む。 A detection method according to an aspect of the present invention is a detection method in a detection system for detecting a moving body, and the detection system includes a transmitter and a receiver held by the mobile body. In the detection method, the transmitter wirelessly transmits a first detection signal, and the receiver receives the first detection signal when the receiver receives the first detection signal. Wirelessly transmitting a first confirmation signal to the transmitter; and when the transmitter receives the first confirmation signal, continuing to wirelessly transmit the first detection signal; and Wirelessly transmitting a second detection signal having a communication range wider than that of the first detection signal when the first confirmation signal cannot be received.
　これによれば、当該検知方法は、通信範囲の異なる二種類の検知用信号を用いることで、検知範囲又は検知精度を向上できる。さらに、当該検知システムは、第１検知用信号が受信されなかった場合に、第２検知用信号を送信する。これにより、不必要に第２検知用信号が送信されることを抑制できるので、発信器の省電力化を実現できる。 According to this, the detection method can improve the detection range or the detection accuracy by using two types of detection signals having different communication ranges. Furthermore, the detection system transmits a second detection signal when the first detection signal is not received. Thereby, since it can suppress that the 2nd signal for a detection is transmitted unnecessarily, the power saving of a transmitter is realizable.
　なお、これらの包括的または具体的な態様は、システム、方法、集積回路、コンピュータプログラムまたはコンピュータ読み取り可能なＣＤ－ＲＯＭなどの記録媒体で実現されてもよく、システム、方法、集積回路、コンピュータプログラム及び記録媒体の任意な組み合わせで実現されてもよい。 Note that these comprehensive or specific modes 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, and the system, method, integrated circuit, and computer program. Also, any combination of recording media may be realized.
　本発明は、消費電力の増加を抑制しつつ、検知範囲又は検知精度を向上できる検知システム又は検知方法を提供できる。 The present invention can provide a detection system or a detection method capable of improving the detection range or detection accuracy while suppressing an increase in power consumption.
図１は、実施の形態に係る検知システムの構成を示す図である。FIG. 1 is a diagram illustrating a configuration of a detection system according to an embodiment. 図２は、実施の形態に係る発信器のブロック図である。FIG. 2 is a block diagram of the transmitter according to the embodiment. 図３は、実施の形態に係る受信器のブロック図である。FIG. 3 is a block diagram of a receiver according to the embodiment. 図４は、実施の形態に係る管理装置のブロック図である。FIG. 4 is a block diagram of the management apparatus according to the embodiment. 図５は、実施の形態に係る検知システムの動作を示す図である。FIG. 5 is a diagram illustrating the operation of the detection system according to the embodiment. 図６は、実施の形態に係る検知用信号の構成例を示す図である。FIG. 6 is a diagram illustrating a configuration example of a detection signal according to the embodiment. 図７は、実施の形態に係る通知信号の構成例を示す図である。FIG. 7 is a diagram illustrating a configuration example of a notification signal according to the embodiment. 図８は、実施の形態に係る発信器と受信器との位置関係の例を示す図である。FIG. 8 is a diagram illustrating an example of a positional relationship between the transmitter and the receiver according to the embodiment. 図９は、実施の形態に係る発信器による動作を示す図である。FIG. 9 is a diagram illustrating an operation performed by the transmitter according to the embodiment. 図１０は、実施の形態に係る発信器の動作を示すフローチャートである。FIG. 10 is a flowchart showing the operation of the transmitter according to the embodiment. 図１１は、実施の形態に係る受信器の動作を示すフローチャートである。FIG. 11 is a flowchart illustrating the operation of the receiver according to the embodiment.
　以下、実施の形態について、図面を参照しながら具体的に説明する。 Hereinafter, embodiments will be specifically described with reference to the drawings.
　なお、以下で説明する実施の形態は、いずれも本発明の一具体例を示すものである。以下の実施の形態で示される数値、形状、材料、構成要素、構成要素の配置位置及び接続形態、ステップ、ステップの順序などは、一例であり、本発明を限定する主旨ではない。また、以下の実施の形態における構成要素のうち、最上位概念を示す独立請求項に記載されていない構成要素については、任意の構成要素として説明される。 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.
　本実施の形態に係る検知システムでは、発信器は、自身が送信した検知用信号を受信器で受信できたかに応じて、送信する検知用信号の周波数帯を切り替える。これにより、当該検知システムは、消費電力の増加を抑制しつつ、検知範囲又は検知精度を向上できる。 In the detection system according to the present embodiment, the transmitter switches the frequency band of the detection signal to be transmitted depending on whether the detection signal transmitted by itself is received by the receiver. Thereby, the said detection system can improve a detection range or a detection precision, suppressing the increase in power consumption.
　まず、本実施の形態に係る検知システム１００の構成を説明する。図１は、本実施の形態に係る検知システム１００の構成を示す図である。 First, the configuration of the detection system 100 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.
　図１に示す検知システム１００は、移動体を検知するためのシステムであって、管理装置１０２と、複数の受信器１０３と、複数の発信器１０４とを含む。例えば、この検知システム１００は、子供又は老人等の位置を検知するために用いられる。例えば、この検知システム１００は、通学路、集合住宅の周辺、老人ホーム又は看護施設等で用いられる。なお、この検知システム１００は、遊園地又はテーマパーク等の施設で、入場者の位置を検知するために用いられてもよい。 A detection system 100 shown in FIG. 1 is a system for detecting a moving object, and includes a management device 102, a plurality of receivers 103, and a plurality of transmitters 104. For example, the detection system 100 is used to detect the position of a child or an elderly person. For example, the detection system 100 is used in a school road, around a housing complex, a nursing home or a nursing facility. In addition, this detection system 100 may be used for detecting the position of a visitor in a facility such as an amusement park or a theme park.
　複数の発信器１０４の各々は、監視対象者である移動体（例えば子供又は老人）に保持（携帯又は装着）される。例えば、発信器１０４は、監視対象者の腕に装着されるブレスレット型（腕時計型）、監視対象者の首にぶら下げられるネックレス型等である。または、発信器１０４は、名札型等であってもよい。 Each of the plurality of transmitters 104 is held (carried or worn) by a moving body (for example, a child or an elderly person) who is a monitoring target. For example, the transmitter 104 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 104 may be a name tag type or the like.
　なお、監視対象の移動体は人に限らず、動物又は移動可能な機械等であってもよい。 Note that the moving object to be monitored is not limited to a person, but may be an animal or a movable machine.
　この発信器１０４は、検知用信号１５１Ａ及び検知用信号１５１Ｂの一方又は両方を定期的に無線送信する。検知用信号１５１Ａ及び１５１Ｂは、例えば、ＩＥＥＥ８０２．１５．４に準拠する無線信号である。例えば、検知用信号１５１Ａは、２．４ＧＨｚ帯の無線信号であり、検知用信号１５１Ｂは、９２０ＭＨｚ帯又は９５０ＭＨｚ帯の無線信号である。なお、検知用信号１５１Ｂに、ＬＰＷＡ（Ｌｏｗ　Ｐｏｗｅｒ，Ｗｉｄｅ　Ａｒｅａ）の無線信号が用いられてもよい。つまり、当該検知システム１００に用いられる無線信号は、比較的無線通信範囲が狭い（例えば２００～３００ｍ程度の）無線信号である。なお、Ｂｌｕｅｔｏｏｔｈ（登録商標）などの他の無線信号が用いられてもよい。 The transmitter 104 periodically transmits one or both of the detection signal 151A and the detection signal 151B by radio. The detection signals 151A and 151B are radio signals that comply with, for example, IEEE 802.15.4. For example, the detection signal 151A is a 2.4 GHz band radio signal, and the detection signal 151B is a 920 MHz band or 950 MHz band radio signal. An LPWA (Low Power, Wide Area) radio signal may be used as the detection signal 151B. 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.
　また、ここでは、検知用信号１５１Ａと１５１Ｂとの波長帯が異なる例を述べるが、検知用信号１５１Ａと１５１Ｂとは通信範囲（到達距離）が異なればよい。つまり、検知用信号１５１Ｂの通信範囲が検知用信号１５１Ｂの通信範囲より広ければよい。例えば、検知用信号１５１Ｂの発信出力（出力電波強度）を検知用信号１５１Ａの発信出力（出力電波強度）より高くしてもよい。または、ＦＳＫ（周波数変調方式）とＬｏＲａ規格等のスペクトラム拡散方式等のように、到達距離の異なる通信方式が用いられてもよい。 Also, here, an example will be described in which the detection signals 151A and 151B have different wavelength bands, but the detection signals 151A and 151B may have different communication ranges (reach distances). That is, it is only necessary that the communication range of the detection signal 151B is wider than the communication range of the detection signal 151B. For example, the transmission output (output radio wave intensity) of the detection signal 151B may be made higher than the transmission output (output radio wave intensity) of the detection signal 151A. Alternatively, communication systems having different reach distances such as FSK (frequency modulation system) and spread spectrum system such as LoRa standard may be used.
　複数の受信器１０３は、監視対象の領域（例えば通学路、公園又は施設）内に配置され、発信器１０４から定期的に無線送信される検知用信号１５１Ａ又は１５１Ｂを受信する。なお、複数の受信器１０３のうち少なくとも一部は、監視者（例えば、施設の職員）等に携帯されてもよい。つまり、複数の受信器１０３の各々は、固定設置されていてもよいし、移動体に保持されていてもよい。 The plurality of receivers 103 are arranged in a monitored area (for example, a school road, a park, or a facility), and receive the detection signals 151A or 151B that are periodically transmitted from the transmitter 104 by radio. It should be noted that at least a part of the plurality of receivers 103 may be carried by a supervisor (for example, facility staff) or the like. That is, each of the plurality of receivers 103 may be fixedly installed or may be held by a moving body.
　受信器１０３は、検知用信号１５１Ａ又は１５１Ｂを受信した場合に、当該検知用信号１５１Ａ又は１５１Ｂを検知した旨を管理装置１０２に通知する。具体的には、受信器１０３は、検知用信号１５１Ａ又は１５１Ｂを検知した旨を示す通知信号１５３を管理装置１０２へ送信する。なお、受信器１０３と管理装置１０２との通信方法は、特に限定されないが、例えば、公衆電話網、インターネット回線（無線或いは有線ＬＡＮ、又はＷｉ－Ｆｉ（登録商標）等を含む）、又は、独自の有線又は無線ネットワーク等を用いることができる。 When the receiver 103 receives the detection signal 151A or 151B, the receiver 103 notifies the management apparatus 102 that the detection signal 151A or 151B has been detected. Specifically, the receiver 103 transmits to the management apparatus 102 a notification signal 153 indicating that the detection signal 151A or 151B has been detected. The communication method between the receiver 103 and the management apparatus 102 is not particularly limited. For example, a public telephone network, an Internet line (including a wireless or wired LAN, Wi-Fi (registered trademark), etc.), or an original A wired or wireless network can be used.
　なお、複数の受信器１０３が無線ネットワークを構築し、当該無線ネットワークを介して通知信号１５３が伝送されてもよい。例えば、複数の受信器１０３は、受信親機と、受信子機とを含む。受信子機から無線送信された信号は、直接或いは１以上の受信子機又は専用の中継器を介して、受信親機に伝達される。信号を受信した受信親機はネットワークを介して管理装置１０２へ信号を送信する。なお、この無線ネットワークで用いられる無線信号の周波数帯及び通信方式は、検知用信号１５１Ａ又は１５１Ｂの周波数帯及び通信方式と同一であってもよいし、異なってもよい。 Note that a plurality of receivers 103 may construct a wireless network, and the notification signal 153 may be transmitted via the wireless network. For example, the plurality of receivers 103 include a reception master unit and a reception slave unit. The signal wirelessly transmitted from the receiver unit is transmitted to the receiver unit directly or via one or more receiver units or a dedicated repeater. The receiving master that has received the signal transmits the signal to the management apparatus 102 via the network. Note that the frequency band and communication method of the wireless signal used in this wireless network may be the same as or different from the frequency band and communication method of the detection signal 151A or 151B.
　管理装置１０２は、例えば、ＰＣ（パーソナルコンピュータ）である。この管理装置１０２は、受信器１０３から送信された通知信号１５３を受信し、通知信号１５３に含まれる情報を用いて、監視対象者の位置を検知する。また、管理装置１０２は、監視対象者の位置を示す位置情報を表示する。 The management device 102 is, for example, a PC (personal computer). The management apparatus 102 receives the notification signal 153 transmitted from the receiver 103, and detects the position of the monitoring target person using information included in the notification signal 153. In addition, the management apparatus 102 displays position information indicating the position of the monitoring target person.
　以下、各装置の構成を説明する。まず、発信器１０４の構成を説明する。図２は、発信器１０４の構成を示すブロック図である。発信器１０４は、第１無線通信部１１１と、第２無線通信部１１２と、制御部１１３と、発信器ＩＤ記憶部１１４と、電源部１１５とを備える。 The configuration of each device will be described below. First, the configuration of the transmitter 104 will be described. FIG. 2 is a block diagram showing the configuration of the transmitter 104. The transmitter 104 includes a first wireless communication unit 111, a second wireless communication unit 112, a control unit 113, a transmitter ID storage unit 114, and a power supply unit 115.
　第１無線通信部１１１は、検知用信号１５１Ａを定期的に無線送信する。また、第１無線通信部１１１は、受信器１０３から無線送信される確認信号１５２Ａを受信する。 The first wireless communication unit 111 periodically transmits the detection signal 151A wirelessly. Further, the first wireless communication unit 111 receives the confirmation signal 152A wirelessly transmitted from the receiver 103.
　第２無線通信部１１２は、検知用信号１５１Ｂを定期的に無線送信する。また、第２無線通信部１１２は、受信器１０３から無線送信される確認信号１５２Ｂを受信する。 The second wireless communication unit 112 periodically transmits the detection signal 151B wirelessly. Further, the second wireless communication unit 112 receives the confirmation signal 152B wirelessly transmitted from the receiver 103.
　また、検知用信号１５１Ｂ及び確認信号１５２Ｂの波長帯は、検知用信号１５１Ａ及び確認信号１５２Ａの波長帯より長い。つまり、検知用信号１５１Ｂ及び１５２Ｂの通信可能範囲（電波到達距離）は、検知用信号１５１Ａ及び１５２Ａの通信可能範囲（電波到達距離）より長い。例えば、検知用信号１５１Ａ及び確認信号１５２Ａは、２．４ＧＨｚ帯の無線信号であり、検知用信号１５１Ｂ及び確認信号１５２Ｂは、９２０ＭＨｚ帯又は９５０ＭＨｚ帯の無線信号である。 In addition, the wavelength bands of the detection signal 151B and the confirmation signal 152B are longer than the wavelength bands of the detection signal 151A and the confirmation signal 152A. That is, the communicable range (radio wave reachable distance) of the detection signals 151B and 152B is longer than the communicable range (radio wave reachable distance) of the detection signals 151A and 152A. For example, the detection signal 151A and the confirmation signal 152A are wireless signals in the 2.4 GHz band, and the detection signal 151B and the confirmation signal 152B are wireless signals in the 920 MHz band or the 950 MHz band.
　制御部１１３は、第１無線通信部１１１及び第２無線通信部１１２を制御する。 The control unit 113 controls the first wireless communication unit 111 and the second wireless communication unit 112.
　発信器ＩＤ記憶部１１４は、当該発信器１０４を一意に特定するために情報である、発信器ＩＤ（発信器識別子）１６１Ａを記憶する。 The transmitter ID storage unit 114 stores a transmitter ID (transmitter identifier) 161A, which is information for uniquely identifying the transmitter 104.
　電源部１１５は、当該発信器１０４に電力を供給する電源であり、例えば、電池又はバッテリー等である。つまり、発信器１０４は、外部からの電源供給を受けることなく、内部からの電源供給（又は内部で生成された電力）のみで動作可能である。 The power supply unit 115 is a power supply that supplies power to the transmitter 104, and is, for example, a battery or a battery. That is, the transmitter 104 can be operated only by power supply from the inside (or power generated inside) without receiving power supply from the outside.
　次に、受信器１０３の構成を説明する。図３は、受信器１０３の構成を示すブロック図である。受信器１０３は、第１無線通信部１２１と、第２無線通信部１２２と、位置計測部１２３と、制御部１２４と、通信部１２５とを備える。 Next, the configuration of the receiver 103 will be described. FIG. 3 is a block diagram illustrating a configuration of the receiver 103. The receiver 103 includes a first wireless communication unit 121, a second wireless communication unit 122, a position measurement unit 123, a control unit 124, and a communication unit 125.
　第１無線通信部１２１は、発信器１０４から無線送信された検知用信号１５１Ａを受信する。第１無線通信部１２１は、検知用信号１５１Ａを受信した場合、当該検知用信号１５１Ａを受信したことを示す確認信号１５２Ａを、当該検知用信号１５１Ａの送信元の発信器１０４へ送信する。 The first wireless communication unit 121 receives the detection signal 151A wirelessly transmitted from the transmitter 104. When receiving the detection signal 151A, the first wireless communication unit 121 transmits a confirmation signal 152A indicating that the detection signal 151A has been received, to the transmitter 104 that is the transmission source of the detection signal 151A.
　第２無線通信部１２２は、発信器１０４から無線送信された検知用信号１５１Ｂを受信する。第２無線通信部１２２は、検知用信号１５１Ｂを受信した場合、当該検知用信号１５１Ｂを受信したことを示す確認信号１５２Ｂを、当該検知用信号１５１Ｂの送信元の発信器１０４へ送信する。 The second wireless communication unit 122 receives the detection signal 151B wirelessly transmitted from the transmitter 104. When the second wireless communication unit 122 receives the detection signal 151B, the second wireless communication unit 122 transmits a confirmation signal 152B indicating that the detection signal 151B has been received to the transmitter 104 that is the transmission source of the detection signal 151B.
　位置計測部１２３は、当該受信器１０３が配置されている位置を計測する。例えば、位置計測部１２３は、ＧＰＳ（Ｇｌｏｂａｌ　Ｐｏｓｉｔｉｏｎｉｎｇ　Ｓｙｓｔｅｍ）機能を有し、当該ＧＰＳ機能を用いて、当該受信器１０３が配置されている位置を計測する。なお、受信器１０３は、位置計測部１２３を備えなくてもよい。 The position measuring unit 123 measures the position where the receiver 103 is arranged. For example, the position measuring unit 123 has a GPS (Global Positioning System) function, and measures the position where the receiver 103 is arranged using the GPS function. Note that the receiver 103 may not include the position measurement unit 123.
　制御部１２４は、検知用信号１５１Ａ又は１５１Ｂが受信された場合に、通知信号１５３を生成する。また、制御部１２４は、第１無線通信部１２１及び第２無線通信部１２２を制御する。 The control unit 124 generates the notification signal 153 when the detection signal 151A or 151B is received. In addition, the control unit 124 controls the first wireless communication unit 121 and the second wireless communication unit 122.
　通信部１２５は、通知信号１５３を管理装置１０２へ送信する。 The communication unit 125 transmits a notification signal 153 to the management apparatus 102.
　なお、受信器１０３の機能が、当該機能を機能別又は信号処理別に分割した複数の機器により実現されてもよい。 It should be noted that the function of the receiver 103 may be realized by a plurality of devices obtained by dividing the function by function or signal processing.
　次に、管理装置１０２の構成を説明する。図４は、管理装置１０２の構成を示すブロック図である。管理装置１０２は、通信部１３１と、受信器位置記憶部１３２と、位置情報生成部１３３と、表示部１３４とを備える。 Next, the configuration of the management apparatus 102 will be described. FIG. 4 is a block diagram illustrating a configuration of the management apparatus 102. The management device 102 includes a communication unit 131, a receiver position storage unit 132, a position information generation unit 133, and a display unit 134.
　通信部１３１は、受信器１０３から送信された通知信号１５３を受信する。 The communication unit 131 receives the notification signal 153 transmitted from the receiver 103.
　受信器位置記憶部１３２は、複数の受信器１０３の位置を記憶する。例えば、受信器位置記憶部１３２は、通知信号１５３に含まれる受信器１０３の位置を示す情報、又は、受信器１０３から予め送られてきた当該受信器１０３の位置を示す情報を記憶する。なお、受信器位置記憶部１３２は、ユーザ操作等により予め入力された、複数の受信器１０３の位置を示す情報を記憶してもよい。 The receiver position storage unit 132 stores the positions of the plurality of receivers 103. For example, the receiver position storage unit 132 stores information indicating the position of the receiver 103 included in the notification signal 153 or information indicating the position of the receiver 103 sent in advance from the receiver 103. Note that the receiver position storage unit 132 may store information indicating the positions of the plurality of receivers 103 input in advance by a user operation or the like.
　位置情報生成部１３３は、通知信号１５３に含まれる情報を用いて発信器１０４の位置を示す位置情報を生成する。表示部１３４は、位置情報を表示する。 The position information generation unit 133 generates position information indicating the position of the transmitter 104 using the information included in the notification signal 153. The display unit 134 displays position information.
　なお、検知システム１００の構成は、図１に示す構成に限定されない。例えば、検知システム１００は、複数の管理装置１０２を含んでもよい。また、複数の管理装置１０２の一部は、施設の職員又は保護者が携帯する携帯端末（例えばスマートフォン）であってもよい。 Note that the configuration of the detection system 100 is not limited to the configuration shown in FIG. For example, the detection system 100 may include a plurality of management devices 102. Also, some of the plurality of management devices 102 may be mobile terminals (for example, smartphones) carried by facility staff or guardians.
　また、管理装置１０２の機能は、複数の機器により実現されてもよい。例えば、管理装置１０２の機能の一部が、ＰＣにより実現され、他の一部が、保護者が携帯するスマートフォンにより実現されてもよい。具体的には、位置情報の生成がある装置（例えばＰＣ）により行われ、生成された位置情報が他の装置（例えばスマートフォン）にネットワーク等を介して送信され、当該他の装置が位置情報を表示してもよい。 Further, the function of the management apparatus 102 may be realized by a plurality of devices. For example, a part of the function of the management apparatus 102 may be realized by a PC, and the other part may be realized by a smartphone carried by a guardian. Specifically, the position information is generated by a device (for example, a PC), and the generated position information is transmitted to another device (for example, a smartphone) via a network or the like. It may be displayed.
　また、受信器１０３が管理装置１０２の少なくとも一部の機能を有してもよいし、管理装置１０２が受信器１０３の少なくとも一部の機能を有してもよい。例えば、受信器１０３が管理装置１０２の全ての機能を有し、検知システム１００に管理装置１０２が含まれなくてもよい。 In addition, the receiver 103 may have at least a part of the function of the management apparatus 102, or the management apparatus 102 may have at least a part of the function of the receiver 103. For example, the receiver 103 has all the functions of the management device 102, and the detection system 100 may not include the management device 102.
　また、管理装置１０２と受信器１０３とが単一の機器として実現される場合には、当該管理装置１０２と受信器１０３との間の信号の伝達は、機器内で行われる。言い換えると、上述した通知信号１５３の伝達は、ネットワーク等を介した機器間の伝達に限らず、機器内の信号の伝達も含む。 Further, when the management apparatus 102 and the receiver 103 are realized as a single device, signal transmission between the management apparatus 102 and the receiver 103 is performed within the device. In other words, the transmission of the notification signal 153 described above includes not only transmission between devices via a network or the like but also transmission of signals within the device.
　以下、検知システム１００の動作を説明する。まず、検知システム１００の全体の動作を説明する。図５は、検知システム１００の動作を示す図である。 Hereinafter, the operation of the detection system 100 will be described. First, the overall operation of the detection system 100 will be described. FIG. 5 is a diagram illustrating the operation of the detection system 100.
　発信器１０４は、定期的に検知用信号１５１Ａ又は１５１Ｂを送信する（Ｓ１０１）。 The transmitter 104 periodically transmits the detection signal 151A or 151B (S101).
　図６は、検知用信号１５１Ａの構成を示す図である。なお、検知用信号１５１Ｂの構成も同様である。図６に示すように検知用信号１５１Ａは、当該検知用信号１５１Ａの送信元の発信器１０４である送信元発信器を識別するための発信器ＩＤ１６１Ａを含む。 FIG. 6 is a diagram showing a configuration of the detection signal 151A. The configuration of the detection signal 151B is the same. As shown in FIG. 6, the detection signal 151 </ b> A includes a transmitter ID 161 </ b> A for identifying the transmission source transmitter that is the transmission source 104 of the detection signal 151 </ b> A.
　また、検知用信号１５１Ａ及び１５１Ｂは、上記以外の情報を含んでもよい。例えば、検知用信号１５１Ａ及び１５１Ｂは、当該検知用信号１５１Ａ又は１５１Ｂの識別番号を含んでもよい。例えば、この識別番号は、発信器１０４が検知用信号１５１Ａ又は１５１Ｂを送信する毎に１インクリメントされる連続番号等である。また、検知用信号１５１Ａ及び１５１Ｂは、当該信号が検知用信号１５１Ａであるか、検知用信号１５１Ｂであるかを示す情報を含んでもよい。例えば、検知用信号１５１Ａ及び１５１Ｂの発信出力のみを変更する場合には、この情報が検知用信号１５１Ａ及び１５１Ｂに含まれる。 Further, the detection signals 151A and 151B may include information other than the above. For example, the detection signals 151A and 151B may include the identification number of the detection signal 151A or 151B. For example, the identification number is a serial number that is incremented by 1 each time the transmitter 104 transmits the detection signal 151A or 151B. Further, the detection signals 151A and 151B may include information indicating whether the signal is the detection signal 151A or the detection signal 151B. For example, when only the transmission output of the detection signals 151A and 151B is changed, this information is included in the detection signals 151A and 151B.
　検知用信号１５１Ａ又は１５１Ｂを受信した受信器１０３は、検知用信号１５１Ａ又は１５１Ｂを受信したことを示す通知信号１５３を管理装置１０２に送信する（Ｓ１０２）。 The receiver 103 that has received the detection signal 151A or 151B transmits to the management apparatus 102 a notification signal 153 indicating that the detection signal 151A or 151B has been received (S102).
　図７は、通知信号１５３の構成を示す図である。図７に示すように、通知信号１５３は、発信器ＩＤ１６１Ｂと、受信器ＩＤ１６２と、受信電波強度情報１６３と、受信器位置情報１６４とを含む。 FIG. 7 is a diagram showing the configuration of the notification signal 153. As shown in FIG. As shown in FIG. 7, notification signal 153 includes transmitter ID 161 </ b> B, receiver ID 162, received radio wave intensity information 163, and receiver position information 164.
　発信器ＩＤ１６１Ｂは、検知用信号１５１Ａ又は１５１Ｂの送信元の発信器１０４を示す。例えば、発信器ＩＤ１６１Ｂは、検知用信号１５１Ａ又は１５１Ｂに含まれる発信器ＩＤ１６１Ａと同一のＩＤである。 The transmitter ID 161B indicates the transmitter 104 that is the transmission source of the detection signal 151A or 151B. For example, transmitter ID 161B is the same ID as transmitter ID 161A included in detection signal 151A or 151B.
　受信器ＩＤ１６２は、検知用信号１５１Ａ又は１５１Ｂを受信した受信器１０３であり、当該通知信号１５３の送信元の受信器１０３を示す。 The receiver ID 162 is the receiver 103 that has received the detection signal 151 </ b> A or 151 </ b> B, and indicates the receiver 103 that has transmitted the notification signal 153.
　受信電波強度情報１６３は、受信器１０３で受信された検知用信号１５１Ａ又は１５１Ｂの受信電波強度を示す。 The received radio wave intensity information 163 indicates the received radio wave intensity of the detection signal 151A or 151B received by the receiver 103.
　受信器位置情報１６４は、当該受信器１０３の現在の位置を示す。例えば、受信器位置情報１６４は、受信器１０３が有するＧＰＳ等により測定された当該受信器１０３の位置情報である。なお、受信器１０３が据置器である場合には、受信器位置情報１６４は、通知信号１５３に含まれなくてもよい。 The receiver position information 164 indicates the current position of the receiver 103. For example, the receiver position information 164 is position information of the receiver 103 measured by GPS or the like that the receiver 103 has. If the receiver 103 is a stationary device, the receiver position information 164 may not be included in the notification signal 153.
　また、通知信号１５３は、上記以外の情報を含んでもよい。例えば、通知信号１５３は、検知用信号１５１Ａ又は１５１Ｂが受信された時刻を示す情報を含んでもよい。また、通知信号１５３は、受信された検知用信号が検知用信号１５１Ａであるか、検知用信号１５１Ｂであるか、その両方であるかを示す情報を含んでもよい。 Further, the notification signal 153 may include information other than the above. For example, the notification signal 153 may include information indicating the time when the detection signal 151A or 151B is received. In addition, the notification signal 153 may include information indicating whether the received detection signal is the detection signal 151A, the detection signal 151B, or both.
　また、受信器１０３は、通知信号１５３を送信する場合に、検知用信号１５１Ａ又は１５１Ｂを受信したことを示す確認信号１５２Ａ又は１５２Ｂを検知用信号１５１Ａ又は１５１Ｂの送信元の発信器１０４へ送信する（Ｓ１０３）。例えば、この確認信号１５２Ａ又は１５２Ｂは、検知用信号１５１Ａ又は１５１Ｂの送信元の発信器１０４の発信器ＩＤ１６１Ａを含む。なお、相手先指定で確認信号１５２Ａ又は１５２Ｂが送信される場合には、確認信号１５２Ａ又は１５２Ｂは発信器ＩＤ１６１Ａを含まなくてもよい。また、通知信号１５３と確認信号１５２Ａ又は１５２Ｂとの送信順序は任意でよい。 Further, when transmitting the notification signal 153, the receiver 103 transmits a confirmation signal 152A or 152B indicating that the detection signal 151A or 151B has been received to the transmitter 104 that is the transmission source of the detection signal 151A or 151B. (S103). For example, the confirmation signal 152A or 152B includes the transmitter ID 161A of the transmitter 104 that is the transmission source of the detection signal 151A or 151B. Note that when the confirmation signal 152A or 152B is transmitted by designation of the other party, the confirmation signal 152A or 152B may not include the transmitter ID 161A. Further, the transmission order of the notification signal 153 and the confirmation signal 152A or 152B may be arbitrary.
　通知信号１５３を受信した管理装置１０２は、受信した複数の通知信号１５３を用いて、発信器１０４の位置を示す位置情報を生成する（Ｓ１０４）。具体的には、位置情報生成部１３３は、通知信号１５３に含まれる受信電波強度情報１６３で示される受信器１０３における検知用信号１５１Ａ又は１５１Ｂの受信電波強度と、受信器１０３の位置とを用いて、発信器１０４の位置を算出する。ここで、受信器１０３の位置として、通知信号１５３に含まれる複数の受信器位置情報１６４で示される複数の受信器１０３の位置、又は、受信器位置記憶部１３２に記憶されている複数の受信器１０３の位置が用いられる。 The management apparatus 102 that has received the notification signal 153 generates position information indicating the position of the transmitter 104 by using the received notification signals 153 (S104). Specifically, the position information generation unit 133 uses the reception radio wave intensity of the detection signal 151A or 151B in the receiver 103 indicated by the reception radio wave intensity information 163 included in the notification signal 153, and the position of the receiver 103. Thus, the position of the transmitter 104 is calculated. Here, as the position of the receiver 103, the positions of the plurality of receivers 103 indicated by the plurality of receiver position information 164 included in the notification signal 153, or a plurality of receptions stored in the receiver position storage unit 132. The position of the vessel 103 is used.
　なお、受信電波強度は、受信器１０３と発信器１０４との距離に応じて変化する（距離が短いと受信電波強度が強くなる）。よって、位置情報生成部１３３は、複数の受信器１０３に対する、受信電波強度と受信器１０３の位置とから発信器１０４の位置を判別できる。 Note that the received radio wave intensity varies according to the distance between the receiver 103 and the transmitter 104 (the shorter the distance, the stronger the received radio wave intensity). Therefore, the position information generation unit 133 can determine the position of the transmitter 104 from the received radio wave intensity and the position of the receiver 103 with respect to the plurality of receivers 103.
　また、位置情報生成部１３３は、各受信器１０３で検知用信号１５１Ａ又は１５１Ｂが受信できたか否かの情報（又は受信電波強度が予め定められた閾値以上か否かを示す情報）のみから、発信器１０４の位置を検知してもよい。つまり、位置情報生成部１３３は、受信電波強度情報１６３を用いなくてもよい。例えば、位置情報は、検知用信号１５１Ａ又は１５１Ｂを受信した受信器１０３を示す情報であってもよい。 In addition, the position information generation unit 133 is based on only information indicating whether or not each of the receivers 103 has received the detection signal 151A or 151B (or information indicating whether or not the received radio wave intensity is equal to or greater than a predetermined threshold). The position of the transmitter 104 may be detected. That is, the position information generation unit 133 may not use the received radio wave intensity information 163. For example, the position information may be information indicating the receiver 103 that has received the detection signal 151A or 151B.
　また、位置情報生成部１３３は、受信器１０３の位置情報を用いなくてもよい。例えば、受信器１０３（例えばスマートフォン）を携帯する職員等が建物内にいる場合には、ＧＰＳを用いた位置計測を行うことができない。このような場合、又は、受信器１０３が位置計測部１２３を備えない場合には、位置情報生成部１３３は、位置情報として、各受信器１０３で検知用信号１５１Ａ又は１５１Ｂが受信できたか否かを示す情報のみを生成してもよいし、検知用信号１５１Ａ又は１５１Ｂを受信した受信器１０３を示す情報のみを生成してもよい。このように、位置情報生成部１３３は、通知信号１５３に基づき、発信器１０４の位置を検知するための情報を生成する。 In addition, the position information generation unit 133 may not use the position information of the receiver 103. For example, when a staff member who carries the receiver 103 (for example, a smartphone) is in a building, position measurement using GPS cannot be performed. In such a case, or when the receiver 103 does not include the position measurement unit 123, the position information generation unit 133 determines whether or not each of the receivers 103 can receive the detection signal 151A or 151B as the position information. Only the information indicating the receiver 103 that has received the detection signal 151A or 151B may be generated. As described above, the position information generation unit 133 generates information for detecting the position of the transmitter 104 based on the notification signal 153.
　以下、発信器１０４の検知用信号１５１Ａ及び１５１Ｂの送信手法について説明する。なお、以下では、１つの発信器１０４と１つの受信器１０３との動作を説明するが、発信器１０４又は受信器１０３が複数存在する場合も同様である。 Hereinafter, a method for transmitting the detection signals 151A and 151B of the transmitter 104 will be described. In the following, the operation of one transmitter 104 and one receiver 103 will be described, but the same applies when there are a plurality of transmitters 104 or receivers 103.
　図８は、発信器１０４と受信器１０３との位置関係を示す図である。図８の（ａ）は、受信器１０３が検知用信号１５１Ａ（短波長）の通信範囲１７１Ａ内に存在する状態を示す。図８の（ｂ）は、受信器１０３が、検知用信号１５１Ａ（短波長）の通信範囲１７１Ａ外、かつ、検知用信号１５１Ｂ（長波長）の通信範囲１７１Ｂ内に存在する状態を示す。図８の（ｃ）は、受信器１０３が、検知用信号１５１Ｂ（長波長）の通信範囲１７１Ｂ外に存在する状態を示す。 FIG. 8 is a diagram showing a positional relationship between the transmitter 104 and the receiver 103. FIG. 8A shows a state in which the receiver 103 exists in the communication range 171A of the detection signal 151A (short wavelength). FIG. 8B shows a state in which the receiver 103 exists outside the communication range 171A of the detection signal 151A (short wavelength) and within the communication range 171B of the detection signal 151B (long wavelength). FIG. 8C illustrates a state where the receiver 103 exists outside the communication range 171B of the detection signal 151B (long wavelength).
　図９は、図８の（ａ）～（ｃ）に示す各状態における発信器１０４の動作を示す図である。図９の（ａ）に示すように、受信器１０３が検知用信号１５１Ａ（短波長）の通信範囲１７１Ａ内に存在する場合、発信器１０４は、検知用信号１５１Ａ（短波長）を送信し、検知用信号１５１Ｂ（長波長）を送信しない。 FIG. 9 is a diagram showing the operation of the transmitter 104 in each state shown in (a) to (c) of FIG. As shown in FIG. 9A, when the receiver 103 is within the communication range 171A of the detection signal 151A (short wavelength), the transmitter 104 transmits the detection signal 151A (short wavelength), The detection signal 151B (long wavelength) is not transmitted.
　図９の（ｂ）に示すように、受信器１０３が、検知用信号１５１Ａ（短波長）の通信範囲１７１Ａ外、かつ、検知用信号１５１Ｂ（長波長）の通信範囲１７１Ｂ内に存在する場合、発信器１０４は、検知用信号１５１Ａ（短波長）及び検知用信号１５１Ｂ（長波長）の両方を送信する。 As shown in FIG. 9B, when the receiver 103 exists outside the communication range 171A of the detection signal 151A (short wavelength) and within the communication range 171B of the detection signal 151B (long wavelength), The transmitter 104 transmits both the detection signal 151A (short wavelength) and the detection signal 151B (long wavelength).
　図９の（ｃ）に示すように、受信器１０３が検知用信号１５１Ｂ（長波長）の通信範囲１７１Ｂ外に存在する場合、発信器１０４は、検知用信号１５１Ａ（短波長）を送信せず、検知用信号１５１Ｂ（長波長）を送信する。 As shown in FIG. 9C, when the receiver 103 is outside the communication range 171B of the detection signal 151B (long wavelength), the transmitter 104 does not transmit the detection signal 151A (short wavelength). The detection signal 151B (long wavelength) is transmitted.
　以下、この処理を実現するための発信器１０４の処理手順の一例を説明する。図１０は、発信器１０４の処理の流れを示すフローチャートである。 Hereinafter, an example of a processing procedure of the transmitter 104 for realizing this processing will be described. FIG. 10 is a flowchart showing a processing flow of the transmitter 104.
　まず、発信器１０４は、検知用信号１５１Ａ（短波長）を送信する（Ｓ１１１）。発信器１０４は、当該検知用信号１５１Ａに対する確認信号１５２Ａを受信器１０３から受信できた場合（Ｓ１１２でＹｅｓ）、所定の間隔で再度、検知用信号１５１Ａを送信する（Ｓ１１１）。つまり、発信器１０４は、検知用信号１５１Ａの送信を継続する。 First, the transmitter 104 transmits a detection signal 151A (short wavelength) (S111). When the transmitter 104 has received the confirmation signal 152A for the detection signal 151A from the receiver 103 (Yes in S112), the transmitter 104 transmits the detection signal 151A again at a predetermined interval (S111). That is, the transmitter 104 continues to transmit the detection signal 151A.
　一方、発信器１０４は、当該検知用信号１５１Ａに対する確認信号１５２Ａを受信器１０３から受信できなかった場合（Ｓ１１２でＮｏ）、検知用信号１５１Ａ（短波長）及び検知用信号１５１Ｂ（長波長）を共に送信する（Ｓ１１３）。つまり、発信器１０４は、検知用信号１５１Ａのみを送信する第１状態から、検知用信号１５１Ａ及び検知用信号１５１Ｂの両方を送信する第２状態に移行する。 On the other hand, when the transmitter 104 cannot receive the confirmation signal 152A for the detection signal 151A from the receiver 103 (No in S112), the transmitter 104 receives the detection signal 151A (short wavelength) and the detection signal 151B (long wavelength). Both are transmitted (S113). That is, the transmitter 104 shifts from the first state in which only the detection signal 151A is transmitted to the second state in which both the detection signal 151A and the detection signal 151B are transmitted.
　この第２状態において、発信器１０４は、検知用信号１５１Ａに対する確認信号１５２Ａを受信器１０３から受信できた場合（Ｓ１１４でＹｅｓ）、検知用信号１５１Ａのみを送信する第１状態に移行する（Ｓ１１１）。つまり、発信器１０４は、検知用信号１５１Ａの送信を継続し、検知用信号１５１Ｂの送信を停止する。 In this second state, when the transmitter 104 can receive the confirmation signal 152A for the detection signal 151A from the receiver 103 (Yes in S114), the transmitter 104 shifts to the first state in which only the detection signal 151A is transmitted (S111). ). That is, the transmitter 104 continues to transmit the detection signal 151A and stops transmitting the detection signal 151B.
　一方、第２状態において、発信器１０４は、検知用信号１５１Ａに対する確認信号１５２Ａを受信器１０３から受信できず、かつ、検知用信号１５１Ｂに対する確認信号１５２Ｂを受信器１０３から受信できた場合（Ｓ１１４でＮｏ、かつＳ１１５でＹｅｓ）、検知用信号１５１Ａ及び検知用信号１５１Ｂの送信を継続する（Ｓ１１３）。つまり、発信器１０４は、第２状態を継続する。 On the other hand, in the second state, the transmitter 104 cannot receive the confirmation signal 152A for the detection signal 151A from the receiver 103 and can receive the confirmation signal 152B for the detection signal 151B from the receiver 103 (S114). No, and Yes in S115), the transmission of the detection signal 151A and the detection signal 151B is continued (S113). That is, the transmitter 104 continues the second state.
　また、発信器１０４は、第２状態において、検知用信号１５１Ａに対する確認信号１５２Ａを、及び、検知用信号１５１Ｂに対する確認信号１５２Ｂのいずれも受信器１０３から受信できない場合（Ｓ１１４でＮｏ、かつＳ１１５でＮｏ）、検知用信号１５１Ｂのみを送信する第３状態に移行する（Ｓ１１６）。つまり、発信器１０４は、検知用信号１５１Ｂの送信を継続し、検知用信号１５１Ａの送信を停止する。 Further, in the second state, the transmitter 104 cannot receive the confirmation signal 152A for the detection signal 151A and the confirmation signal 152B for the detection signal 151B from the receiver 103 (No in S114, and S115). No), a transition is made to the third state in which only the detection signal 151B is transmitted (S116). That is, the transmitter 104 continues to transmit the detection signal 151B and stops transmitting the detection signal 151A.
　また、発信器１０４は、第３状態において、検知用信号１５１Ｂに対する確認信号１５２Ｂを受信器１０３から受信できない場合（Ｓ１１５でＮｏ）、検知用信号１５１Ｂのみを送信する第３状態を継続する（Ｓ１１６）。一方、発信器１０４は、第３状態において、検知用信号１５１Ｂに対する確認信号１５２Ｂを受信器１０３から受信できた場合（Ｓ１１５でＹｅｓ）、検知用信号１５１Ａ及び検知用信号１５１Ｂを共に送信する第２状態を移行する（Ｓ１１３）。 Further, when the transmitter 104 cannot receive the confirmation signal 152B for the detection signal 151B from the receiver 103 in the third state (No in S115), the transmitter 104 continues the third state in which only the detection signal 151B is transmitted (S116). ). On the other hand, when the transmitter 104 has received the confirmation signal 152B for the detection signal 151B from the receiver 103 in the third state (Yes in S115), the transmitter 104 transmits both the detection signal 151A and the detection signal 151B. The state is changed (S113).
　次に、受信器１０３の動作を説明する。図１１は、受信器１０３の処理の流れを示すフローチャートである。 Next, the operation of the receiver 103 will be described. FIG. 11 is a flowchart showing a processing flow of the receiver 103.
　図１１に示すように、受信器１０３は、検知用信号１５１Ａ（短波長）を受信した場合（Ｓ１２１でＹｅｓ）、確認信号１５２Ａ（短波長）を、検知用信号１５１Ａの送信元の発信器１０４へ無線送信する（Ｓ１２２）。また、受信器１０３は、検知用信号１５１Ｂ（長波長）を受信した場合（Ｓ１２３でＹｅｓ）、確認信号１５２Ｂ（長波長）を、検知用信号１５１Ｂの送信元の発信器１０４へ無線送信する（Ｓ１２４）。 As shown in FIG. 11, when the receiver 103 receives the detection signal 151A (short wavelength) (Yes in S121), the receiver 103 transmits the confirmation signal 152A (short wavelength) to the transmitter 104 of the detection signal 151A. (S122). Further, when receiving the detection signal 151B (long wavelength) (Yes in S123), the receiver 103 wirelessly transmits the confirmation signal 152B (long wavelength) to the transmitter 104 that is the transmission source of the detection signal 151B ( S124).
　以上のように、本実施の形態では、発信器１０４は、検知用信号１５１Ａを無線送信し、受信器１０３は、検知用信号１５１Ａを受信した場合、当該検知用信号１５１Ａを受信したことを示す確認信号１５２Ａを発信器１０４に無線送信する。発信器１０４は、確認信号１５２Ａを受信した場合、検知用信号１５１Ａの無線送信を継続し、確認信号１５２Ａを受信できなかった場合、検知用信号１５１Ａより通信範囲が広い検知用信号１５１Ｂを無線送信する。 As described above, in this embodiment, the transmitter 104 wirelessly transmits the detection signal 151A, and when the receiver 103 receives the detection signal 151A, it indicates that the detection signal 151A has been received. The confirmation signal 152A is wirelessly transmitted to the transmitter 104. When the transmitter 104 receives the confirmation signal 152A, the transmitter 104 continues to wirelessly transmit the detection signal 151A. When the transmitter 104 cannot receive the confirmation signal 152A, the transmitter 104 wirelessly transmits the detection signal 151B having a wider communication range than the detection signal 151A. To do.
　これにより、検知システム１００は、波長帯の異なる二種類の検知用信号１５１Ａ及び１５１Ｂを用いることで、検知範囲又は検知精度を向上できる。具体的には、通信範囲が狭い検知用信号１５１Ａを用いることで、複数の受信器１０３が密に存在する領域において、高精度の位置検知を実現できる。 Thereby, the detection system 100 can improve the detection range or the detection accuracy by using two types of detection signals 151A and 151B having different wavelength bands. Specifically, by using the detection signal 151A having a narrow communication range, highly accurate position detection can be realized in an area where a plurality of receivers 103 exist densely.
　また、通信範囲が広い検知用信号１５１Ｂを用いることで、複数の受信器１０３が疎に存在する領域においても、発信器１０４の位置を見失うことなく、検知を継続できる。例えば、施設内等の複数の受信器１０３が配置されている環境では、検知用信号１５１Ａにより精度の高い検知を実現できるとともに、屋外等の受信器１０３の配置間隔が広い場所でも検知用信号１５１Ｂにより検知を継続できる。 Further, by using the detection signal 151B having a wide communication range, the detection can be continued without losing sight of the position of the transmitter 104 even in an area where a plurality of receivers 103 exist sparsely. For example, in an environment where a plurality of receivers 103 are arranged in a facility or the like, highly accurate detection can be realized by the detection signal 151A, and the detection signal 151B can be used even in a place where the arrangement intervals of the receivers 103 are wide, such as outdoors. Detection can be continued.
　また、迷子、徘徊者、又は遭難者等を探索する際には、例えば、複数の探索者が、受信器１０３を携帯し、探索を行う状況も想定される。このような場合に、通信範囲の広い検知用信号１５１Ｂが用いられることで、迅速さ探索を実現できる。 Also, when searching for a lost child, a deceased person, a victim, etc., for example, a situation where a plurality of searchers carry the receiver 103 and perform a search is also assumed. In such a case, the speed search can be realized by using the detection signal 151B having a wide communication range.
　さらに、検知システム１００は、検知用信号１５１Ａが受信されなかった場合に、検知用信号１５１Ｂを送信する。これにより、不必要に検知用信号１５１Ａが送信されることを抑制できるので、発信器１０４の省電力化を実現できる。 Furthermore, the detection system 100 transmits the detection signal 151B when the detection signal 151A is not received. Thereby, since it is possible to suppress the detection signal 151A from being transmitted unnecessarily, power saving of the transmitter 104 can be realized.
　また、図９の（ｂ）に示すように、発信器１０４は、確認信号１５２Ａを受信できなかった場合、検知用信号１５１Ａと検知用信号１５１Ｂとの両方を無線送信し、確認信号１５２Ａを受信した場合、検知用信号１５１Ｂの無線送信を停止する。 As shown in FIG. 9B, when the transmitter 104 cannot receive the confirmation signal 152A, the transmitter 104 wirelessly transmits both the detection signal 151A and the detection signal 151B and receives the confirmation signal 152A. In this case, the wireless transmission of the detection signal 151B is stopped.
　これにより、検知システム１００は、検知用信号１５１Ａが受信されなかった場合にも、検知用信号１５１Ａの送信を継続する。これにより、発信器１０４が受信器１０３に近づいた際に、直ちに検知用信号１５１Ａを用いた検知を再開できる。また、検知システム１００は、確認信号１５２Ａを受信できたか否かの判断に基づき、容易に検知用信号１５１Ｂの送信を停止できる。 Thereby, the detection system 100 continues to transmit the detection signal 151A even when the detection signal 151A is not received. Thereby, when the transmitter 104 approaches the receiver 103, the detection using the detection signal 151A can be resumed immediately. Further, the detection system 100 can easily stop the transmission of the detection signal 151B based on the determination as to whether or not the confirmation signal 152A has been received.
　また、図９の（ｂ）及び（ｃ）に示すように、受信器１０３は、検知用信号１５１Ｂを受信した場合、検知用信号１５１Ｂを受信したことを示す確認信号１５２Ｂを発信器１０４に無線送信する。発信器１０４は、確認信号１５２Ｂを受信できた場合、検知用信号１５１Ａと検知用信号１５１Ｂとの両方を無線送信し、確認信号１５２Ｂの両方を受信できなかった場合、検知用信号１５１Ａを無線送信せず、検知用信号１５１Ｂを無線送信する。 Further, as shown in FIGS. 9B and 9C, when the receiver 103 receives the detection signal 151B, the receiver 103 wirelessly transmits a confirmation signal 152B to the transmitter 104 indicating that the detection signal 151B has been received. Send. The transmitter 104 wirelessly transmits both the detection signal 151A and the detection signal 151B when receiving the confirmation signal 152B, and wirelessly transmits the detection signal 151A when both the confirmation signal 152B cannot be received. Without detection, the detection signal 151B is wirelessly transmitted.
　これによれば、検知システム１００は、検知用信号１５１Ａが受信される可能性が少ない、受信器１０３が検知用信号１５１Ｂの通信範囲外に存在する場合に、不必要に検知用信号１５１Ａが送信されることを抑制できる。よって、発信器１０４の省電力化を実現できる。また、検知システム１００は、確認信号１５２Ｂを受信できたか否かの判断に基づき、容易に検知用信号１５１Ａの送信を停止できる。 According to this, the detection system 100 is less likely to receive the detection signal 151A. When the receiver 103 is outside the communication range of the detection signal 151B, the detection signal 151A is unnecessarily transmitted. Can be suppressed. Therefore, power saving of the transmitter 104 can be realized. Further, the detection system 100 can easily stop the transmission of the detection signal 151A based on the determination as to whether or not the confirmation signal 152B has been received.
　なお、図９では、受信器１０３が検知用信号１５１Ｂの通信範囲外に存在する場合に、検知用信号１５１Ａを送信しない例を示したが、この場合においても検知用信号１５１Ａが送信されてもよい。これにより、検知用信号１５１Ａの送信を行うか、行わないかの切り替えが不要となるので、処理を簡略化できる。 FIG. 9 shows an example in which the detection signal 151A is not transmitted when the receiver 103 is outside the communication range of the detection signal 151B. However, even in this case, the detection signal 151A is transmitted. Good. This eliminates the need for switching whether or not to transmit the detection signal 151A, and thus simplifies the processing.
　また、上記説明では、確認信号１５２Ａ又は１５２Ｂを発信器１０４が受信できるか否かに応じて、各種動作を切り替えているが、発信器１０４における確認信号１５２Ａ又は１５２Ｂの受信電波強度が閾値以上であるか否かに応じて、各種動作を切り替えてもよい。 In the above description, various operations are switched depending on whether or not the transmitter 104 can receive the confirmation signal 152A or 152B. However, the received radio wave intensity of the confirmation signal 152A or 152B in the transmitter 104 is greater than or equal to the threshold value. Various operations may be switched depending on whether or not there is.
　また、図９の（ａ）及び（ｂ）に示すように、発信器１０４は、確認信号１５２Ａを受信した場合（図９の（ａ））、検知用信号１５１Ａを間隔Ｔ１で無線送信し、確認信号１５２Ａを受信できなかった場合（図９の（ｂ））、検知用信号１５１Ａを間隔Ｔ１より長い間隔Ｔ２で無線送信する。 Further, as shown in FIGS. 9A and 9B, when the transmitter 104 receives the confirmation signal 152A (FIG. 9A), the transmitter 104 wirelessly transmits the detection signal 151A at an interval T1, When the confirmation signal 152A cannot be received ((b) of FIG. 9), the detection signal 151A is wirelessly transmitted at an interval T2 longer than the interval T1.
　これにより、検知システム１００は、受信されるかが不確定な検知用信号１５１Ａの送信頻度を下げることができるので、発信器１０４の省電力化を実現できる。 Thereby, since the detection system 100 can reduce the transmission frequency of the detection signal 151A whether reception is uncertain, the power saving of the transmitter 104 can be realized.
　また、図９の（ｂ）及び（ｃ）に示すように、発信器１０４は、確認信号１５２Ｂを受信した場合（図９の（ｂ））、検知用信号１５１Ｂを間隔Ｔ３で無線送信し、確認信号１５２Ｂを受信できなかった場合（図９の（ｃ））、検知用信号１５１Ｂを間隔Ｔ３より長い間隔Ｔ４で無線送信する。 Further, as shown in FIGS. 9B and 9C, when the transmitter 104 receives the confirmation signal 152B (FIG. 9B), the transmitter 104 wirelessly transmits the detection signal 151B at an interval T3. When the confirmation signal 152B cannot be received ((c) of FIG. 9), the detection signal 151B is wirelessly transmitted at an interval T4 longer than the interval T3.
　これにより、検知システム１００は、受信されるかが不確定な検知用信号１５１Ｂの送信頻度を下げることができるので、発信器１０４の省電力化を実現できる。 Thereby, since the detection system 100 can reduce the transmission frequency of the detection signal 151B that is uncertain whether it is received or not, the power saving of the transmitter 104 can be realized.
　また、図９の（ａ）及び（ｂ）に示すように、発信器１０４は、確認信号１５２Ａを受信できなかった場合（図９の（ｂ））、検知用信号１５１Ｂを間隔Ｔ１より間隔Ｔ３で無線送信する。 Further, as shown in FIGS. 9A and 9B, when the transmitter 104 cannot receive the confirmation signal 152A (FIG. 9B), the detection signal 151B is separated from the interval T1 by the interval T3. Send wirelessly.
　これによれば、検知システム１００は、検知用信号１５１Ｂの送信頻度を下げることができるので、発信器１０４の省電力化を実現できる。例えば、検知用信号１５１Ｂが送信される状況は、迷子、徘徊者、又は遭難者等を探索する場合等の状況が考えられる。上記動作により、このような状況において、バッテリーが切れることを抑制できる。 According to this, since the detection system 100 can reduce the transmission frequency of the detection signal 151B, the power saving of the transmitter 104 can be realized. For example, the situation where the detection signal 151B is transmitted may be a situation where a lost child, a deceased person, a victim, or the like is searched. With the above operation, the battery can be prevented from running out in such a situation.
　なお、図９に示す送信間隔は一例であり、本実施の形態はこれに限定されない。例えば、各状態における検知用信号１５１Ａの送信間隔は同一であってもよい。また、各状態における検知用信号１５１Ｂの送信間隔は同一であってもよい。また、検知用信号１５１Ａと検知用信号１５１Ｂの送信間隔は同一であってもよい。 Note that the transmission interval shown in FIG. 9 is an example, and the present embodiment is not limited to this. For example, the transmission interval of the detection signal 151A in each state may be the same. Further, the transmission interval of the detection signal 151B in each state may be the same. Further, the transmission intervals of the detection signal 151A and the detection signal 151B may be the same.
　また、検知用信号１５１Ｂの送信間隔は、検知用信号１５１Ａの送信間隔より短くてもよい。これにより、迷子、徘徊者、又は遭難者等を探索する場合等における検知精度を向上できる。 Further, the transmission interval of the detection signal 151B may be shorter than the transmission interval of the detection signal 151A. Thereby, the detection accuracy in the case of searching for a lost child, a deceased person, a victim, etc. can be improved.
　また、間隔Ｔ２は間隔Ｔ１より短くてもよい。これにより、迷子、徘徊者、又は遭難者等を探索する場合等における検知精度を向上できる。同様に、間隔Ｔ４は間隔Ｔ３より短くてもよい。 Further, the interval T2 may be shorter than the interval T1. Thereby, the detection accuracy in the case of searching for a lost child, a deceased person, a victim, or the like can be improved. Similarly, the interval T4 may be shorter than the interval T3.
　また、図９では、検知用信号１５１Ａと検知用信号１５１Ｂとが同期して送信されているが、同期していなくてもよい。また、検知用信号１５１Ａと検知用信号１５１Ｂとの送信タイミングを意図的にずらしてもよい。 In FIG. 9, the detection signal 151 </ b> A and the detection signal 151 </ b> B are transmitted in synchronization, but may not be synchronized. Further, the transmission timing of the detection signal 151A and the detection signal 151B may be intentionally shifted.
　また、上記説明では、検知用信号１５１Ａと検知用信号１５１Ｂとの両方が送信される第２状態を経由して、検知用信号１５１Ａのみが送信される第１状態と、検知用信号１５１Ｂのみが送信される第３状態とが切り替わっているが、第２状態を経由せずに、第１状態と第３状態とが切り替わってもよい。例えば、発信器１０４は、第１状態において確認信号１５２Ａを受信できない場合に、検知用信号１５１Ｂのみを送信する第３状態に遷移する。また、発信器１０４は、第３状態において、確認信号１５２Ｂの受信電波強度を検知し、当該受信電波強度が閾値より高い場合（つまり、発信器１０４と受信器１０３とが近づいたと想定される場合）に、検知用信号１５１Ａのみを送信する第１状態に遷移してもよい。 In the above description, the first state in which only the detection signal 151A is transmitted via the second state in which both the detection signal 151A and the detection signal 151B are transmitted, and only the detection signal 151B is transmitted. Although the transmitted third state is switched, the first state and the third state may be switched without going through the second state. For example, when the transmitter 104 cannot receive the confirmation signal 152A in the first state, the transmitter 104 transits to the third state in which only the detection signal 151B is transmitted. Further, in the third state, the transmitter 104 detects the received radio wave intensity of the confirmation signal 152B, and when the received radio wave intensity is higher than the threshold (that is, when the transmitter 104 and the receiver 103 are assumed to be close to each other). ), A transition may be made to the first state in which only the detection signal 151A is transmitted.
　または、第１状態と第３状態との遷移のうち、一方の状態から他方の状態への遷移に対しては第２状態を経由し、他方の状態から一方の状態への遷移に対しては第２状態を経由しなくてもよい。例えば、発信器１０４は、第１状態において、確認信号１５２Ａを受信できない場合に、検知用信号１５１Ｂのみを送信する第３状態に遷移する。また、発信器１０４は、確認信号１５２Ｂの受信電波強度が閾値より高い場合に、検知用信号１５１Ａ及び検知用信号１５１Ｂの両方を送信する第２状態に遷移し、当該第２状態において確認信号１５２Ａが受信できた場合に、検知用信号１５１Ａのみを送信する第１状態に遷移してもよい。 Or, of the transitions from the first state to the third state, the transition from one state to the other state is via the second state, and the transition from the other state to the one state is It is not necessary to go through the second state. For example, when the transmitter 104 cannot receive the confirmation signal 152A in the first state, the transmitter 104 transits to the third state in which only the detection signal 151B is transmitted. Further, when the received signal strength of the confirmation signal 152B is higher than the threshold value, the transmitter 104 transitions to the second state in which both the detection signal 151A and the detection signal 151B are transmitted, and the confirmation signal 152A in the second state. May be transferred to the first state in which only the detection signal 151A is transmitted.
　また、上記説明では、受信器１０３は、検知用信号１５１Ａを受信できた場合に確認信号１５２Ａを送信しているが、検知用信号１５１Ａの受信電波強度が閾値以上であるかを判定し、検知用信号１５１Ａの受信電波強度が閾値以上である場合に確認信号１５２Ａを送信し、検知用信号１５１Ａの受信電波強度が閾値未満である場合には確認信号１５２Ａを送信しなくてもよい。これにより、発信器１０４と受信器１０３との距離が、検知用信号１５１Ａの通信範囲の境界に近づいた時点で、検知用信号１５１Ａ及び１５１Ｂの両方が送信されるので、上記境界付近において発信器１０４が確認信号１５２Ａ及び１５１Ｂのいずれも受信できない期間が発生することを抑制できる。これにより検知精度を向上できる。なお、上記閾値は、検知用信号１５１Ａを受信できたかを判定する基準よりも高い値である。言い換えると、受信器１０３は、検知用信号１５１Ａを受信できた場合でも、検知用信号１５１の受信電波強度が閾値未満の場合は、確認信号１５２Ａを送信しない。 In the above description, the receiver 103 transmits the confirmation signal 152A when the detection signal 151A is received. However, the receiver 103 determines whether or not the received radio wave intensity of the detection signal 151A is equal to or higher than the threshold value. The confirmation signal 152A may be transmitted when the received signal strength of the signal for use 151A is greater than or equal to the threshold value, and the confirmation signal 152A may not be transmitted when the received signal strength of the signal for detection 151A is less than the threshold value. As a result, both the detection signals 151A and 151B are transmitted when the distance between the transmitter 104 and the receiver 103 approaches the boundary of the communication range of the detection signal 151A. It is possible to suppress the occurrence of a period during which 104 cannot receive any of the confirmation signals 152A and 151B. Thereby, detection accuracy can be improved. The threshold value is higher than a criterion for determining whether or not the detection signal 151A has been received. In other words, even when the receiver 103 can receive the detection signal 151A, the receiver 103 does not transmit the confirmation signal 152A if the received radio wave intensity of the detection signal 151 is less than the threshold.
　以上、本発明の実施の形態に係る検知システムについて説明したが、本発明は、この実施の形態に限定されるものではない。 Although the detection system according to the embodiment of the present invention has been described above, the present invention is not limited to this embodiment.
　例えば、上記実施の形態に係る検知システムに含まれる各装置に含まれる各処理部は典型的には集積回路であるＬＳＩとして実現される。これらは個別に１チップ化されてもよいし、一部又は全てを含むように１チップ化されてもよい。 For example, each processing unit included in each device included in the detection system according to the above 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.
　また、集積回路化はＬＳＩに限るものではなく、専用回路又は汎用プロセッサで実現してもよい。ＬＳＩ製造後にプログラムすることが可能なＦＰＧＡ（Ｆｉｅｌｄ　Ｐｒｏｇｒａｍｍａｂｌｅ　Ｇａｔｅ　Ａｒｒａｙ）、又はＬＳＩ内部の回路セルの接続や設定を再構成可能なリコンフィギュラブル・プロセッサを利用してもよい。 Further, the integration of circuits 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.
　また、上記実施の形態に係る検知システムに含まれる各装置の機能の一部又は全てを、ＣＰＵ等のプロセッサがプログラムを実行することにより実現してもよい。 Further, some or all of the functions of each device included in the detection system according to the above embodiment may be realized by a processor such as a CPU executing a program.
　さらに、本発明は上記プログラムであってもよいし、上記プログラムが記録された非一時的なコンピュータ読み取り可能な記録媒体であってもよい。また、上記プログラムは、インターネット等の伝送媒体を介して流通させることができるのは言うまでもない。 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.
　また、本発明は検知システムとして実現できるだけでなく、検知システムに含まれる発信器、受信器、又は管理装置として実現してもよい。また、本発明は、このような検知システムに含まれる特徴的な手段をステップとする検知方法として実現したり、そのような特徴的なステップをコンピュータに実行させるプログラムとして実現したりすることもできる。 In addition, the present invention can be realized not only as a detection system but also as a transmitter, a 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. .
　また、上記で用いた数字は、全て本発明を具体的に説明するために例示するものであり、本発明は例示された数字に制限されない。 Further, all the numbers used above are illustrated for specifically explaining the present invention, and the present invention is not limited to the illustrated numbers.
　また、ブロック図における機能ブロックの分割は一例であり、複数の機能ブロックを一つの機能ブロックとして実現したり、一つの機能ブロックを複数に分割したり、一部の機能を他の機能ブロックに移してもよい。また、類似する機能を有する複数の機能ブロックの機能を単一のハードウェア又はソフトウェアが並列又は時分割に処理してもよい。 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.
　また、上記フローチャートで示すステップが実行される順序は、本発明を具体的に説明するために例示するためのものであり、上記以外の順序であってもよい。また、上記ステップの一部が、他のステップと同時（並列）に実行されてもよい。 Further, the order in which the steps shown in the flowchart are executed is for illustration in order to specifically describe the present invention, 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.
　以上、一つまたは複数の態様に係る検知システムについて、実施の形態に基づいて説明したが、本発明は、この実施の形態に限定されるものではない。本発明の趣旨を逸脱しない限り、当業者が思いつく各種変形を本実施の形態に施したものや、異なる実施の形態における構成要素を組み合わせて構築される形態も、一つまたは複数の態様の範囲内に含まれてもよい。 As described above, the detection system according to one or more aspects has been described based on the embodiment, but 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.
　本発明は、検知システムに適用できる。 The present invention can be applied to a detection system.
　１００　検知システム
　１０２　管理装置
　１０３　受信器
　１０４　発信器
　１１１、１２１　第１無線通信部
　１１２、１２２　第２無線通信部
　１１３、１２４　制御部
　１１４　発信器ＩＤ記憶部
　１１５　電源部
　１２３　位置計測部
　１２５、１３１　通信部
　１３２　受信器位置記憶部
　１３３　位置情報生成部
　１３４　表示部
　１５１Ａ、１５１Ｂ　検知用信号
　１５２Ａ、１５２Ｂ　確認信号
　１５３　通知信号
　１６１Ａ、１６１Ｂ　発信器ＩＤ
　１６２　受信器ＩＤ
　１６３　受信電波強度情報
　１６４　受信器位置情報
　１７１Ａ、１７１Ｂ　通信範囲 DESCRIPTION OF SYMBOLS 100 Detection system 102 Management apparatus 103 Receiver 104 Transmitter 111,121 1st wireless communication part 112,122 2nd wireless communication part 113,124 Control part 114 Transmitter ID memory | storage part 115 Power supply part 123 Position measurement part 125,131 Communication Unit 132 Receiver position storage unit 133 Position information generation unit 134 Display unit 151A, 151B Detection signal 152A, 152B Confirmation signal 153 Notification signal 161A, 161B Transmitter ID
162 Receiver ID
163 Received signal strength information 164 Receiver position information 171A, 171B Communication range

Claims (10)

  1. 　移動体を検知するための検知システムであって、
    　前記移動体に保持される発信器と、
    　受信器とを含み、
    　前記発信器は、第１検知用信号を無線送信し、
    　前記受信器は、前記第１検知用信号を受信した場合、当該第１検知用信号を受信したことを示す第１確認信号を前記発信器に無線送信し、
    　前記発信器は、
    　前記第１確認信号を受信した場合、前記第１検知用信号の無線送信を継続し、
    　前記第１確認信号を受信できなかった場合、前記第１検知用信号より通信範囲が広い第２検知用信号を無線送信する
    　検知システム。     A detection system for detecting a moving object,
    A transmitter held by the mobile body;
    Including a receiver,
    The transmitter wirelessly transmits a first detection signal,
    When the receiver receives the first detection signal, the receiver wirelessly transmits a first confirmation signal indicating that the first detection signal has been received to the transmitter;
    The transmitter is
    When the first confirmation signal is received, the wireless transmission of the first detection signal is continued,
    A detection system that wirelessly transmits a second detection signal having a communication range wider than that of the first detection signal when the first confirmation signal cannot be received.
  2. 　前記発信器は、
    　前記第１確認信号を受信できなかった場合、前記第１検知用信号と前記第２検知用信号との両方を無線送信し、
    　前記第１確認信号を受信した場合、前記第２検知用信号の無線送信を停止する
    　請求項１記載の検知システム。     The transmitter is
    If the first confirmation signal could not be received, wirelessly transmit both the first detection signal and the second detection signal,
    The detection system according to claim 1, wherein when the first confirmation signal is received, wireless transmission of the second detection signal is stopped.
  3. 　前記受信器は、前記第２検知用信号を受信した場合、当該第２検知用信号を受信したことを示す第２確認信号を前記発信器に無線送信し、
    　前記発信器は、
    　前記第２確認信号を受信できた場合、前記第１検知用信号と前記第２検知用信号との両方を無線送信し、
    　前記第２確認信号の両方を受信できなかった場合、前記第１検知用信号を無線送信せず、前記第２検知用信号を無線送信する
    　請求項１又は２記載の検知システム。     When the receiver receives the second detection signal, the receiver wirelessly transmits a second confirmation signal indicating that the second detection signal has been received to the transmitter;
    The transmitter is
    When the second confirmation signal is received, both the first detection signal and the second detection signal are wirelessly transmitted,
    The detection system according to claim 1 or 2, wherein when both of the second confirmation signals cannot be received, the first detection signal is not transmitted wirelessly and the second detection signal is wirelessly transmitted.
  4. 　前記発信器は、
    　前記第１確認信号を受信した場合、前記第１検知用信号を第１間隔で無線送信し、
    　前記第１確認信号を受信できなかった場合、前記第１検知用信号を前記第１間隔より長い第２間隔で無線送信する
    　請求項３記載の検知システム。     The transmitter is
    When the first confirmation signal is received, the first detection signal is wirelessly transmitted at a first interval,
    The detection system according to claim 3, wherein when the first confirmation signal cannot be received, the first detection signal is wirelessly transmitted at a second interval longer than the first interval.
  5. 　前記発信器は、
    　前記第２確認信号を受信した場合、前記第２検知用信号を第３間隔で無線送信し、
    　前記第２確認信号を受信できなかった場合、前記第２検知用信号を前記第３間隔より長い第４間隔で無線送信する
    　請求項３又は４記載の検知システム。     The transmitter is
    When the second confirmation signal is received, the second detection signal is wirelessly transmitted at a third interval,
    The detection system according to claim 3 or 4, wherein when the second confirmation signal cannot be received, the second detection signal is wirelessly transmitted at a fourth interval longer than the third interval.
  6. 　前記発信器は、前記第１確認信号を受信できなかった場合、前記第２検知用信号を前記第１間隔より長い第３間隔で無線送信する
    　請求項３又は４記載の検知システム。     5. The detection system according to claim 3, wherein, when the transmitter cannot receive the first confirmation signal, the transmitter wirelessly transmits the second detection signal at a third interval longer than the first interval.
  7. 　前記第１検知用信号は、第１波長帯であり、
    　前記第２検知用信号は、前記第１波長帯より長い第２波長帯である
    　請求項１～６のいずれか１項に記載の検知システム。     The first detection signal is a first wavelength band,
    The detection system according to any one of claims 1 to 6, wherein the second detection signal is in a second wavelength band longer than the first wavelength band.
  8. 　前記第１検知用信号及び第１確認信号は、第１波長帯であり、
    　前記第１検知用信号及び第２確認信号は、前記第１波長帯より長い第２波長帯である
    　請求項３～６のいずれか１項に記載の検知システム。     The first detection signal and the first confirmation signal are in a first wavelength band,
    The detection system according to any one of claims 3 to 6, wherein the first detection signal and the second confirmation signal are in a second wavelength band longer than the first wavelength band.
  9. 　前記受信器は、前記第１検知用信号の受信電波強度が予め定められた閾値より高い場合に前記第１確認信号を前記発信器に無線送信する
    　請求項１～８のいずれか１項に記載の検知システム。     The receiver according to any one of claims 1 to 8, wherein the receiver wirelessly transmits the first confirmation signal to the transmitter when a reception radio wave intensity of the first detection signal is higher than a predetermined threshold. Detection system.
  10. 　移動体を検知するための検知システムにおける検知方法であって、
    　前記検知システムは、
    　前記移動体に保持される発信器と、
    　受信器とを含み、
    　前記検知方法は、
    　前記発信器が、第１検知用信号を無線送信するステップと、
    　前記受信器が、前記第１検知用信号を受信した場合、当該第１検知用信号を受信したことを示す第１確認信号を前記発信器に無線送信するステップと、
    　前記発信器が、前記第１確認信号を受信した場合、前記第１検知用信号の無線送信を継続するステップと、
    　前記発信器が、前記第１確認信号を受信できなかった場合、前記第１検知用信号より通信範囲が広い第２検知用信号を無線送信するステップとを含む
    　検知方法。     A detection method in a detection system for detecting a moving object,
    The detection system includes:
    A transmitter held by the mobile body;
    Including a receiver,
    The detection method is:
    The transmitter wirelessly transmitting a first detection signal;
    When the receiver receives the first detection signal, wirelessly transmitting a first confirmation signal indicating that the first detection signal has been received to the transmitter;
    When the transmitter receives the first confirmation signal, continuing the wireless transmission of the first detection signal;
    And a step of wirelessly transmitting a second detection signal having a wider communication range than the first detection signal when the transmitter fails to receive the first confirmation signal.
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