JPWO2018167985A1 - Detection system and detection method - Google Patents

Abstract

  The detection system (100) is a system for detecting a mobile, and includes a transmitter (104) held by the mobile and a receiver (103), wherein the transmitter (104) When the detection signal (151A) is wirelessly transmitted, and the receiver (103) receives the first detection signal (151A), a first confirmation signal indicating that the first detection signal (151A) is received When (152A) is wirelessly transmitted to the transmitter (104) and the transmitter (104) receives the first confirmation signal (152A), the wireless transmission of the first detection signal (151A) is continued, and the first detection signal (151A) is transmitted. When the confirmation signal (152A) can not be received, the second detection signal (151B) whose communication range is wider than the first detection signal (151A) is wirelessly transmitted.

Description

  The present invention relates to a detection system and a detection method for detecting a moving object.

  In recent years, with the increase of elderly people, management of patients or residents in hospitals, nursing homes or nursing homes has become a problem. Such tenants also include patients with dementia and may be lost due to hemorrhoids.

  On the other hand, Patent Document 1 discloses that an RFID terminal held by a mobile transmits identification information signals at a plurality of types of frequencies. This can improve the detection accuracy.

WO 2006/092858

  In such a system, it is desirable to be able to improve the detection range or detection accuracy. On the other hand, since the transmitter and the like held by the mobile unit mainly uses the battery as a power source, power saving for prolonging the life is desired.

  Then, an object of this invention is to provide the detection system or detection method which can improve a detection range or detection accuracy, suppressing increase of power consumption.

  A detection system according to an aspect of the present invention is a detection system for detecting a mobile, comprising: a transmitter held by the mobile; and a receiver, wherein the transmitter is for a first detection When a signal is transmitted by radio, and the receiver receives the first detection signal, the receiver transmits by radio a first confirmation signal indicating that the first detection signal is received, to the transmitter, and the transmitter When the first confirmation signal is received, the wireless transmission of the first detection signal is continued, and when the first confirmation signal can not be received, the communication range is wider than the first detection signal. Wirelessly transmit the detection signal.

  According to this configuration, the detection system can improve the detection range or detection accuracy by using two types of detection signals having different communication ranges. Furthermore, the said detection system transmits the signal for 2nd detection, when the signal for 1st detection is not received. As a result, unnecessary transmission of the second detection signal can be suppressed, and power saving of the transmitter can be realized.

  For example, when the transmitter can not receive the first confirmation signal, the transmitter wirelessly transmits both the first detection signal and the second detection signal, and receives the first confirmation signal. The wireless transmission of the second detection signal may be stopped.

  According to this configuration, the detection system continues transmission of the first detection signal even when the first detection signal is not received. Thereby, when the transmitter approaches the receiver, the detection using the first detection signal can be resumed immediately. Further, the detection system can easily stop transmission of the second detection signal based on the determination as to whether or not the first confirmation signal has been received.

  For example, when the receiver receives the second detection signal, the receiver wirelessly transmits a second confirmation signal indicating that the second detection signal is received, to the transmitter. [2] When the confirmation signal can be received, both the first detection signal and the second detection signal are wirelessly transmitted, and when both the second confirmation signal can not be received, the first detection signal And the second detection signal may be transmitted by radio.

  According to this configuration, since the detection system can suppress unnecessary transmission of the first detection signal, power saving of the transmitter can be realized. Further, the detection system can easily stop transmission of the first detection signal based on the determination as to whether or not the second confirmation signal has been received.

  For example, when the transmitter receives the first confirmation signal, the transmitter wirelessly transmits the first detection signal at a first interval, and when the transmitter can not receive the first confirmation signal, the first detection signal. May be wirelessly transmitted at a second interval longer than the first interval.

  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, power saving of the transmitter can be realized.

  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 can not receive the second confirmation signal, the second detection signal. May be wirelessly transmitted at a fourth interval longer than the third interval.

  According to this configuration, since the detection system can reduce the transmission frequency of the second detection signal which is uncertain whether it is received or not, power saving of the transmitter can be realized.

  For example, when the transmitter can not receive the first confirmation signal, the transmitter may wirelessly transmit the second detection signal at a third interval longer than the first interval.

  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.

  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.

  According to this configuration, the detection system can improve the detection range or detection accuracy by using two types of detection signals having different wavelength bands.

  For example, even if the first detection signal and the first confirmation signal are in a first wavelength band, and the first detection signal and the second confirmation signal are in a second wavelength band longer than the first wavelength band. Good.

  According to this configuration, the confirmation signal can be accurately transmitted to the transmitter.

  For example, the receiver may wirelessly transmit the first confirmation signal to the transmitter when the received radio wave strength of the first detection signal is higher than a predetermined threshold.

  According to this configuration, it is possible to improve detection accuracy near the boundary of the communication range of the first detection signal.

  A detection method according to an aspect of the present invention is a detection method in a detection system for detecting a mobile object, the detection system including a transmitter held by the mobile object, and a receiver. The detection method includes the steps of: the transmitter wirelessly transmitting a first detection signal; and when the receiver receives the first detection signal, the first detection signal is received. Wirelessly transmitting a first confirmation signal to the transmitter; and continuing the wireless transmission of the first detection signal when the transmitter receives the first confirmation signal; Wirelessly transmitting a second detection signal whose communication range is wider than the first detection signal when the first confirmation signal can not be received.

  According to this, the said detection method can improve a detection range or detection accuracy by using two types of signals for detection with which communication ranges differ. Furthermore, the said detection system transmits the signal for 2nd detection, when the signal for 1st detection is not received. As a result, unnecessary transmission of the second detection signal can be suppressed, and power saving of the transmitter can be realized.

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

  The present invention can provide a detection system or method that can improve the detection range or detection accuracy while suppressing the increase in power consumption.

FIG. 1 is a diagram showing the configuration of a detection system according to the embodiment. FIG. 2 is a block diagram of a 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 a management device according to the embodiment. FIG. 5 is a diagram showing an operation of the detection system according to the embodiment. FIG. 6 is a diagram showing an exemplary configuration of a detection signal according to the embodiment. FIG. 7 is a diagram showing an exemplary configuration of a notification signal according to the embodiment. FIG. 8 is a diagram showing an example of the positional relationship between a transmitter and a receiver according to the embodiment. FIG. 9 is a diagram showing an operation of 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 showing the operation of the receiver according to the embodiment.

  Embodiments will be specifically described below with reference to the drawings.

  Each embodiment described below shows one specific example of the present invention. Numerical values, shapes, materials, components, arrangement positions and connection forms of components, steps, order of steps, and the like shown in the following embodiments are merely examples, and the present invention is not limited thereto. Further, among the components in the following embodiments, components not described in the independent claim indicating the highest concept are described as arbitrary components.

  In the detection system according to the present embodiment, the transmitter switches the frequency band of the detection signal to be transmitted according to whether the detection signal transmitted by itself can be received by the receiver. Thus, the detection system can improve the detection range or detection accuracy while suppressing an increase in power consumption.

  First, the configuration of a 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.

  A detection system 100 shown in FIG. 1 is a system for detecting a mobile, and includes a management apparatus 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, in a nursing home, a nursing facility, or the like. The detection system 100 may be used to detect the position of an attendee at a facility such as an amusement park or a theme park.

  Each of the plurality of transmitters 104 is held (carried or attached) by a mobile 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.

  The mobile object to be monitored is not limited to a human, and 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, for example, wireless signals conforming to 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. Note that a radio signal of low power, low area (LPWA) may be used as the detection signal 151B. That is, the wireless signal used for 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.

  In addition, although an example in which the wavelength bands of the detection signals 151A and 151B are different will be described here, the communication signals (reaching distances) of the detection signals 151A and 151B may be different. That is, the communication range of the detection signal 151B may be wider than the communication range of the detection signal 151B. For example, the transmission output (output radio wave strength) of the detection signal 151B may be set higher than the transmission output (output radio wave strength) of the detection signal 151A. Alternatively, communication schemes with different reach distances may be used, such as spread spectrum schemes such as FSK (frequency modulation scheme) and LoRa standard.

  The plurality of receivers 103 are disposed in the area to be monitored (for example, a school road, a park or a facility), and receive the detection signal 151A or 151B periodically transmitted from the transmitter 104 by radio. Note that at least a part of the plurality of receivers 103 may be carried by a supervisor (for example, staff of a facility) or the like. That is, each of the plurality of receivers 103 may be fixedly installed or held by a mobile.

  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. Although the communication method between the receiver 103 and the management apparatus 102 is not particularly limited, for example, a public telephone network, an internet connection (including a wireless or wired LAN, Wi-Fi (registered trademark), etc.) or an original Wired or wireless networks can be used.

  A plurality of receivers 103 may construct a wireless network, and the notification signal 153 may be transmitted through the wireless network. For example, the plurality of receivers 103 include a receiver master and a receiver slave. A signal wirelessly transmitted from the receiver slave unit is transmitted to the master receiver unit directly or via one or more receiver slave units or a dedicated repeater. The receiving master that has received the signal transmits a signal to the management device 102 via the network. The frequency band and communication system of the wireless signal used in the wireless network may be the same as or different from the frequency band and communication system 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 person to be monitored using the information included in the notification signal 153. Further, the management device 102 displays position information indicating the position of the person to be monitored.

  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. As shown in FIG. 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 wirelessly transmits the detection signal 151A. 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 wirelessly transmits the detection signal 151B. In addition, the second wireless communication unit 112 receives the confirmation signal 152 B wirelessly transmitted from the receiver 103.

  Further, 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 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 for supplying power to the transmitter 104, and is, for example, a battery or a battery. That is, the transmitter 104 can operate only with the internal power supply (or the internally generated power) without receiving the external power supply.

  Next, the configuration of the receiver 103 will be described. FIG. 3 is a block diagram showing the configuration of the receiver 103. As shown in FIG. 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 151 </ b> A wirelessly transmitted from the transmitter 104. When the first wireless communication unit 121 receives 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.

  The second wireless communication unit 122 receives the detection signal 151 </ b> B 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.

  The position measurement unit 123 measures the position where the receiver 103 is disposed. For example, the position measurement unit 123 has a GPS (Global Positioning System) function, and uses the GPS function to measure the position at which the receiver 103 is disposed. The receiver 103 may not include the position measurement unit 123.

  The control unit 124 generates the notification signal 153 when the detection signal 151A or 151B is received. Further, the control unit 124 controls the first wireless communication unit 121 and the second wireless communication unit 122.

  The communication unit 125 transmits the notification signal 153 to the management apparatus 102.

  Note that the function of the receiver 103 may be realized by a plurality of devices obtained by dividing the function by function or by signal processing.

  Next, the configuration of the management apparatus 102 will be described. FIG. 4 is a block diagram showing the configuration of the management apparatus 102. As shown in FIG. 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. 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 transmitted from the receiver 103 in advance. The receiver position storage unit 132 may store information indicating the positions of the plurality of receivers 103 previously input 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. For example, the detection system 100 may include a plurality of management devices 102. In addition, some of the plurality of management devices 102 may be portable terminals (for example, smart phones) carried by staff or a guardian of the facility.

  Also, the function of the management apparatus 102 may be realized by a plurality of devices. For example, a part of the functions of the management apparatus 102 may be realized by a PC, and another part may be realized by a smartphone carried by a parent. Specifically, the generation of position information is performed 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, and the other device performs the position information You may display it.

  Also, the receiver 103 may have at least a part of the functions of the management apparatus 102, and the management apparatus 102 may have at least a part of the functions of the receiver 103. For example, the receiver 103 may have all the functions of the management apparatus 102, and the detection system 100 may not include the management apparatus 102.

  Also, when the management device 102 and the receiver 103 are realized as a single device, the transmission of signals between the management device 102 and the receiver 103 is performed in the device. In other words, the transmission of the notification signal 153 described above is not limited to the transmission between devices via a network or the like, but also includes the transmission of a signal in the device.

  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 showing an operation of the detection system 100.

  The transmitter 104 periodically transmits the detection signal 151A or 151B (S101).

  FIG. 6 is a diagram showing the configuration of the detection signal 151A. The configuration of the detection signal 151B is also the same. As shown in FIG. 6, the detection signal 151A includes a transmitter ID 161A for identifying a transmission source transmitter that is the transmitter 104 of the transmission source of the detection signal 151A.

  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 or the like which is incremented by one each time the transmitter 104 transmits the detection signal 151A or 151B. The detection signals 151A and 151B may include information indicating whether the signals are 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 a notification signal 153 indicating that the detection signal 151A or 151B has been received to the management apparatus 102 (S102).

  FIG. 7 is a diagram showing the configuration of the notification signal 153. As shown in FIG. As shown in FIG. 7, the notification signal 153 includes a transmitter ID 161 B, a receiver ID 162, received radio field strength information 163, and receiver position information 164.

  The transmitter ID 161B indicates the transmitter 104 of the transmission source of the detection signal 151A or 151B. For example, the transmitter ID 161B is the same ID as the transmitter ID 161A included in the detection signal 151A or 151B.

  The receiver ID 162 is the receiver 103 that has received the detection signal 151A or 151B, and indicates the receiver 103 that is the transmission source of the notification signal 153.

  The received radio wave strength information 163 indicates the received radio wave strength 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. For example, the receiver position information 164 is position information of the receiver 103 measured by the GPS or the like that the receiver 103 has. Note that when the receiver 103 is a stationary device, the receiver position information 164 may not be included in the notification signal 153.

  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. Further, the notification signal 153 may include information indicating whether the received detection signal is the detection signal 151A, the detection signal 151B, or both of them.

  Also, 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 of 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 of the transmission source of the detection signal 151A or 151B. In addition, when confirmation signal 152A or 152B is transmitted by destination designation, confirmation signal 152A or 152B does not need to contain transmitter ID161A. Further, 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 positional information indicating the position of the transmitter 104 using the plurality of received notification signals 153 (S104). Specifically, position information generation unit 133 uses the received radio wave intensity of detection signal 151A or 151B in receiver 103 indicated by received radio wave intensity information 163 included in notification signal 153, and the position of receiver 103. 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 the plurality of receptions stored in the receiver position storage unit 132. The position of the vessel 103 is used.

  The received radio wave intensity changes 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 strength and the position of the receiver 103 with respect to the plurality of receivers 103.

  Further, the position information generation unit 133 uses only the information (or the information indicating whether or not the received radio wave intensity is equal to or more than a predetermined threshold) whether or not the detection signal 151A or 151B can be received by each receiver 103. 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.

  Further, the position information generation unit 133 may not use the position information of the receiver 103. For example, when there is a worker or the like who carries the receiver 103 (for example, a smartphone) in the building, it is not possible to perform position measurement using the GPS. 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 each receiver 103 can receive the detection signal 151A or 151B as the position information. Or the information indicating the receiver 103 which has received the detection signal 151A or 151B. Thus, based on the notification signal 153, the position information generation unit 133 generates information for detecting the position of the transmitter 104.

  Hereinafter, a transmission method of the detection signals 151A and 151B of the transmitter 104 will be described. Although the operation of one transmitter 104 and one receiver 103 will be described below, the same applies to the case where a plurality of transmitters 104 or receivers 103 exist.

  FIG. 8 is a diagram showing the positional relationship between the transmitter 104 and the receiver 103. As shown in FIG. (A) of FIG. 8 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 in the communication range 171B of the detection signal 151B (long wavelength). FIG. 8C shows a state in which the receiver 103 exists outside the communication range 171B of the detection signal 151B (long wavelength).

  FIG. 9 is a diagram showing an operation of the transmitter 104 in each state shown in (a) to (c) of FIG. As shown in (a) of FIG. 9, when the receiver 103 exists 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.

  When the receiver 103 exists outside the communication range 171A of the detection signal 151A (short wavelength) and in the communication range 171B of the detection signal 151B (long wavelength) as shown in FIG. The transmitter 104 transmits both the detection signal 151A (short wavelength) and the detection signal 151B (long wavelength).

  As illustrated in (c) of FIG. 9, when the receiver 103 exists outside the communication range 171B of the detection signal 151B (long wavelength), the transmitter 104 does not transmit the detection signal 151A (short wavelength). , Detection signal 151B (long wavelength) is transmitted.

  Hereinafter, an example of a processing procedure of the transmitter 104 for realizing this processing will be described. FIG. 10 is a flowchart showing the flow of processing of the transmitter 104.

  First, the transmitter 104 transmits the detection signal 151A (short wavelength) (S111). When the transmitter 104 can receive 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 transmission of the detection signal 151A.

  On the other hand, when the transmitter 104 can not receive the confirmation signal 152A for the detection signal 151A from the receiver 103 (No in S112), the detection signal 151A (short wavelength) and the detection signal 151B (long wavelength) It transmits together (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.

  In the 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 transmission of the detection signal 151A and stops transmission of the detection signal 151B.

  On the other hand, in the second state, when the transmitter 104 can not 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.

  Further, in the second state, when the transmitter 104 can not receive any of 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 in S115 No), the processing shifts to the third state in which only the detection signal 151B is transmitted (S116). That is, the transmitter 104 continues transmission of the detection signal 151B and stops transmission of the detection signal 151A.

  In addition, in the third state, when the confirmation signal 152B for the detection signal 151B can not be received 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, in the third state, when the confirmation signal 152B for the detection signal 151B can be received from the receiver 103 in the third state (Yes in S115), the transmitter 104 transmits the detection signal 151A and the detection signal 151B together. The state is shifted (S113).

  Next, the operation of the receiver 103 will be described. FIG. 11 is a flowchart showing the flow of processing of the receiver 103.

  As shown in FIG. 11, when the receiver 103 receives the detection signal 151A (short wavelength) (Yes in S121), the confirmation signal 152A (short wavelength) is transmitted from the transmitter 104 of the transmission source of the detection signal 151A. It wirelessly transmits (S122). When the receiver 103 receives 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).

  As described above, in the present embodiment, when the transmitter 104 wirelessly transmits the detection signal 151A, and the receiver 103 receives the detection signal 151A, it indicates that the detection signal 151A is received. The confirmation signal 152A is wirelessly transmitted to the transmitter 104. The transmitter 104 continues wireless transmission of the detection signal 151A when the confirmation signal 152A is received, and wirelessly transmits the detection signal 151B whose communication range is wider than the detection signal 151A when the confirmation signal 152A is not received. Do.

  Thus, the detection system 100 can improve the detection range or detection accuracy by using the 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 a region where the plurality of receivers 103 are densely present.

  Further, by using the detection signal 151B having a wide communication range, detection can be continued without losing the position of the transmitter 104 even in an area where the plurality of receivers 103 exist sparsely. For example, in an environment where a plurality of receivers 103 such as in a facility are arranged, detection with high accuracy can be realized by the detection signal 151A, and the detection signal 151B can be used even in a place where the arrangement interval of the receivers 103 is wide. Can continue detection.

  Moreover, when searching for a lost child, a deceased person, or a distressed person, for example, a situation where a plurality of searchers carry the receiver 103 and perform a search is also assumed. In such a case, rapid detection can be realized by using the detection signal 151B having a wide communication range.

  Furthermore, the detection system 100 transmits the detection signal 151B when the detection signal 151A is not received. Thus, unnecessary transmission of the detection signal 151A can be suppressed, and power saving of the transmitter 104 can be realized.

  Also, as shown in (b) of FIG. 9, when the transmitter 104 can not receive the confirmation signal 152A, it wirelessly transmits both the detection signal 151A and the detection signal 151B, and receives the confirmation signal 152A. If it does, the wireless transmission of the detection signal 151B is stopped.

  Thereby, the detection system 100 continues transmission of the detection signal 151A even when the detection signal 151A is not received. Thus, when the transmitter 104 approaches the receiver 103, detection using the detection signal 151A can be resumed immediately. Further, the detection system 100 can easily stop transmission of the detection signal 151B based on the determination as to whether or not the confirmation signal 152A has been received.

  Also, as shown in (b) and (c) of FIG. 9, when the receiver 103 receives the detection signal 151B, the receiver 103 wirelessly transmits a confirmation signal 152B indicating that the detection signal 151B has been received to the transmitter 104. Send. The transmitter 104 wirelessly transmits both the detection signal 151A and the detection signal 151B when it can receive the confirmation signal 152B, and wirelessly transmits the detection signal 151A when it can not receive both of the confirmation signal 152B. Instead, the detection signal 151B is wirelessly transmitted.

  According to this, the detection system 100 transmits the detection signal 151A unnecessarily when the receiver 103 is out of the communication range of the detection signal 151B, which is less likely to receive the detection signal 151A. Can be suppressed. Therefore, power saving of the transmitter 104 can be realized. Further, the detection system 100 can easily stop transmission of the detection signal 151A based on the determination as to whether or not the confirmation signal 152B has been received.

  Although FIG. 9 illustrates an example in which the detection signal 151A is not transmitted when the receiver 103 is out of the communication range of the detection signal 151B, even in this case, the detection signal 151A is also transmitted. Good. This eliminates the need to switch between transmitting and not transmitting the detection signal 151A, thus simplifying the process.

  In the above description, various operations are switched depending on whether or not the confirmation signal 152A or 152B can be received by the transmitter 104, but the received radio wave strength of the confirmation signal 152A or 152B in the transmitter 104 is equal to or higher than the threshold. Various operations may be switched depending on whether or not there are any.

  Also, as shown in (a) and (b) of FIG. 9, when the confirmation signal 152A is received ((a) in FIG. 9), the transmitter 104 wirelessly transmits the detection signal 151A at the interval T1, When the confirmation signal 152A can not be received ((b) in FIG. 9), the detection signal 151A is wirelessly transmitted at an interval T2 longer than the interval T1.

  As a result, the detection system 100 can reduce the transmission frequency of the detection signal 151A which is uncertain whether it is received or not, so power saving of the transmitter 104 can be realized.

  Also, as shown in (b) and (c) of FIG. 9, when the confirmation signal 152B is received ((b) in FIG. 9), the transmitter 104 wirelessly transmits the detection signal 151B at an interval T3, When the confirmation signal 152B can not be received ((c) in FIG. 9), the detection signal 151B is wirelessly transmitted at an interval T4 longer than the interval T3.

  As a result, the detection system 100 can reduce the transmission frequency of the detection signal 151B which is uncertain whether it is received or not, so power saving of the transmitter 104 can be realized.

  Further, as shown in (a) and (b) of FIG. 9, when the transmitter 104 can not receive the confirmation signal 152A ((b) in FIG. 9), the detection signal 151B is separated from the interval T1 by an interval T3. Wirelessly transmit.

  According to this, since the detection system 100 can reduce the transmission frequency of the detection signal 151B, power saving of the transmitter 104 can be realized. For example, as a situation where the detection signal 151B is transmitted, a situation such as when searching for a lost child, a deceased person, a distressed person or the like can be considered. The above operation can suppress the battery 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. For example, the transmission interval of the detection signal 151A in each state may be the same. Further, the transmission intervals 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.

  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 or a distressed person can be improved.

  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 or a distressed person can be improved. Similarly, the interval T4 may be shorter than the interval T3.

  Further, in FIG. 9, although the detection signal 151A and the detection signal 151B are transmitted synchronously, they do not have to be synchronized. Further, the transmission timings of the detection signal 151A and the detection signal 151B may be intentionally shifted.

  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 Although the third state to be transmitted is switched, the first state and the third state may be switched without passing through the second state. For example, when the transmitter 104 can not receive the confirmation signal 152A in the first state, the transmitter 104 transitions to the third state in which only the detection signal 151B is transmitted. Also, in the third state, the transmitter 104 detects the received radio wave strength of the confirmation signal 152B, and when the received radio wave strength is higher than the threshold (that is, it is assumed that the transmitter 104 and the receiver 103 approach each other). To the first state in which only the detection signal 151A is transmitted.

  Alternatively, of the transitions from the first state to the third state, the transition from one state to the other state passes through the second state, and the transition from the other state to the one state It is not necessary to go through the second state. For example, in the first state, when the confirmation signal 152A can not be received, the transmitter 104 transitions to the third state in which only the detection signal 151B is transmitted. In addition, when the received radio field strength of the confirmation signal 152B is higher than the threshold, the transmitter 104 transitions to a second state in which both the detection signal 151A and the detection signal 151B are transmitted, and in the second state, the confirmation signal 152A. May be transitioned to the first state in which only the detection signal 151A is transmitted.

  In the above description, the receiver 103 transmits the confirmation signal 152A when it can receive the detection signal 151A, but determines whether the received radio wave intensity of the detection signal 151A is equal to or higher than a threshold value. The confirmation signal 152A may be transmitted when the received radio wave strength of the signal 151A is equal to or greater than the threshold, and the confirmation signal 152A may not be transmitted when the received radio wave strength of the detection signal 151A is less than the threshold. Thus, when the distance between the transmitter 104 and the receiver 103 approaches the boundary of the communication range of the detection signal 151A, both of the detection signals 151A and 151B are transmitted, so that the transmitter near the boundary It can suppress that the period which 104 can not receive any of the confirmation signals 152A and 151B generate | occur | produces. This can improve detection accuracy. Note that the threshold is a value higher than a reference for determining whether the detection signal 151A has been received. In other words, even if the receiver 103 can receive the detection signal 151A, the receiver 103 does not transmit the confirmation signal 152A if the received radio wave strength of the detection signal 151 is less than the threshold.

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

  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 which is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include some or all.

  Further, the circuit integration is not limited to LSI's, and implementation using dedicated circuitry or general purpose processors is also possible. A field programmable gate array (FPGA) that can be programmed after LSI fabrication, or a reconfigurable processor that can reconfigure connection and setting of circuit cells inside the LSI may be used.

  In addition, some or all of the functions of the devices included in the detection system according to the above embodiment may be realized by a processor such as a CPU executing a program.

  Furthermore, the present invention may be the above program or a non-transitory computer readable recording medium in which the above program is recorded. Further, it goes without saying that the program can be distributed via a transmission medium such as the Internet.

  Moreover, 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. Also, the present invention can be realized as a detection method having the characteristic means included in such a detection system as a step, or as a program that causes a computer to execute such a characteristic step. .

  In addition, all the numerals used above are illustrated to specifically explain the present invention, and the present invention is not limited to the illustrated numerals.

  Also, division of functional blocks in the block diagram is an example, and a plurality of functional blocks may be realized as one functional block, one functional block may be divided into a plurality of parts, or some functions may be transferred to another function block. May be Also, a single piece of hardware or software may process the functions of a plurality of functional blocks having similar functions in parallel or in time division.

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

  As mentioned above, although the detection system which concerns on one or several aspect was demonstrated based on embodiment, this invention is not limited to this embodiment. Without departing from the spirit of the present invention, various modifications that can be conceived by those skilled in the art may be applied to the present embodiment, and modes configured by combining components in different embodiments may also be in the scope of one or more aspects. May be included within.

  The present invention is applicable to detection systems.

Reference Signs List 100 detection system 102 management apparatus 103 receiver 104 transmitter 111, 121 first wireless communication unit 112, 122 second wireless communication unit 113, 124 control unit 114 transmitter ID storage unit 115 power supply unit 123 position measurement unit 125, 131 communication Section 132 Receiver position storage section 133 Position information generation section 134 Display section 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

For example, even if the first detection signal and the first confirmation signal are in a first wavelength band, and the second detection signal and the second confirmation signal are in a second wavelength band longer than the first wavelength band. Good.

Further, as shown in (a) and (b) of FIG. 9, when the transmitter 104 can not receive the confirmation signal 152A ((b) in FIG. 9), the detection signal 151B has an interval longer than the interval T1. Transmit wirelessly at T3.

Claims (10)

A detection system for detecting a moving object,
A transmitter held by the mobile unit;
Including a receiver and
The transmitter wirelessly transmits a first detection signal,
When the receiver receives the first detection signal, the receiver wirelessly transmits, to the transmitter, a first confirmation signal indicating that the first detection signal has been received.
The transmitter is
When the first confirmation signal is received, the wireless transmission of the first detection signal is continued,
A detection system for wirelessly transmitting a second detection signal whose communication range is wider than that of the first detection signal when the first confirmation signal can not be received. The transmitter is
When the first confirmation signal can not be received, both of the first detection signal and the second detection signal are wirelessly transmitted,
The detection system according to claim 1, wherein the wireless transmission of the second detection signal is stopped when the first confirmation signal is received. When the receiver receives the second detection signal, the receiver wirelessly transmits, to the transmitter, a second confirmation signal indicating that the second detection signal has been received.
The transmitter is
When the second confirmation signal can be received, both the first detection signal and the second detection signal are transmitted by radio.
The detection system according to claim 1, wherein the first detection signal is not transmitted wirelessly, and the second detection signal is transmitted wirelessly, when both of the second confirmation signals can not be received. 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 can not be received, the first detection signal is wirelessly transmitted at a second interval longer than the first interval. 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, wherein, when the second confirmation signal is not received, the second detection signal is wirelessly transmitted at a fourth interval longer than the third interval. The detection system according to claim 3, wherein the transmitter wirelessly transmits the second detection signal at a third interval longer than the first interval when the first confirmation signal can not be received. The first detection signal is in a first wavelength band,
The detection system according to any one of claims 1 to 6, wherein the second detection signal is a second wavelength band longer than the first wavelength band. 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 a second wavelength band longer than the first wavelength band. The receiver according to any one of claims 1 to 8, wherein the receiver wirelessly transmits the first confirmation signal to the transmitter when the received radio wave intensity of the first detection signal is higher than a predetermined threshold. Detection system. A detection method in a detection system for detecting a moving object, comprising:
The detection system
A transmitter held by the mobile unit;
Including a receiver and
The detection method is
Wirelessly transmitting the first detection signal by the transmitter;
Wirelessly transmitting a first confirmation signal indicating that the first detection signal has been received to the transmitter when the receiver receives the first detection signal;
Continuing the wireless transmission of the first detection signal when the transmitter receives the first confirmation signal;
Wirelessly transmitting a second detection signal whose communication range is wider than the first detection signal when the transmitter can not receive the first confirmation signal.

Images