JP6445356B2 - Mobile body monitoring system, slave unit, master unit, and program - Google Patents

Description

  The present invention provides a plurality of slave units that are respectively attached to a mobile object to be monitored and transmit a plurality of monitoring information of the mobile object, and a master unit that receives a plurality of monitoring information transmitted from each slave unit, And a monitoring system for a moving body.

  Conventionally, for example, as disclosed in Patent Document 1, a slave unit that is attached to a moving body such as a child and transmits its own position information as child monitoring information, and monitoring information transmitted from the slave unit are displayed. There has been proposed a monitoring system for a moving body that includes a parent device for receiving.

  By providing a plurality of slave units disclosed in Patent Document 1, the master unit can receive position information of a plurality of mobile objects. When there are a plurality of slave units, communication between the slave units and the master unit may be performed using a time division multiple access (TDMA) technique (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 6-188819 JP 2006-186766 A

  In Patent Document 1, only position information is used as monitoring information. However, it is conceivable that each child device transmits a plurality of monitoring information to the parent device. In this case, each slave unit may transmit only monitoring information designated by the master unit.

  Specifically, the parent device transmits a designation signal that designates monitoring information to be transmitted to each child device. When each slave unit receives the designation signal from the master unit, each slave unit transmits the monitoring information designated by the designation signal to the master unit by time division multiple access.

  However, in the method in which the master unit receives desired monitoring information by transmitting the designation signal to each slave unit, each slave unit does not transmit the monitoring information indicated by the designation signal unless the designation signal is received. As a result, the parent device cannot receive desired monitoring information from the child device that has failed to receive the designated signal.

  Further, since each slave unit transmits only one piece of monitoring information, the master unit cannot receive unspecified monitoring information. Non-designated monitoring information is not received not only by the master unit but also by other terminals having a wireless reception function.

  Accordingly, an object of the present invention is to provide a monitoring system for a mobile unit that can receive a plurality of monitoring information from each slave unit by the master unit without a designation signal that designates monitoring information to be transmitted, the slave unit, the master unit, And providing a program to be executed by the parent device.

  A monitoring system for a moving body of the present invention includes a plurality of slave units that are respectively attached to a plurality of mobile units that are monitoring targets, and a master unit that is connected to each slave unit by wireless communication.

  For example, in a moving body monitoring system, a child machine is attached to a hound (moving body) to be monitored. The parent machine is held by the hunter. In the moving body monitoring system, for example, the position information of the hound is the first monitoring information, and the surrounding sound information such as the hound is the second monitoring information. The position information is obtained, for example, when the slave unit receives a GPS signal. Ambient sound information is obtained when the slave unit picks up sound with a microphone.

  Each slave unit is assigned to the first unit, a first monitoring information acquisition unit that acquires first monitoring information of a mobile unit on which the mobile unit is mounted, a second monitoring information acquisition unit that acquires second monitoring information of the mobile unit, And a first wireless communication unit that wirelessly transmits the first monitoring information in the determined time slot.

  For example, a GPS signal can be used for synchronization of wireless communication between each child device and the parent device. Since the time data included in the GPS signal is extremely accurate, it can be used for synchronization of wireless communication between each child device and the parent device.

  The first wireless communication unit transmits the second monitoring information in a second frequency channel different from the first frequency channel for transmission of the first monitoring information in at least one time slot other than the time slot allocated by itself. . The parent device includes a second wireless communication unit that wirelessly receives information transmitted from each child device, and a switching unit that switches a reception frequency channel of the second wireless communication unit.

  In the mobile monitoring system of the present invention, even if the slave unit does not receive the designation signal, the first monitor information and the second monitor information are transmitted on different frequency channels for each time slot. A plurality of monitoring information can be received from each slave unit simply by switching the channel.

  The master unit has an assigning unit that assigns a different frequency channel to each slave unit as a second frequency channel for each slave unit, and the first wireless communication unit receives the assignment information of the second frequency channel from the master unit Then, the second monitoring information may be transmitted on the second frequency channel.

  Thereby, the monitoring system for mobile bodies can prevent the transmission of the second monitoring information by each slave unit from colliding because the master unit unifies the second frequency channel.

  Specifically, the second monitoring information acquisition unit acquires the ambient sound information of the own device as the second monitoring information, and the allocating unit assigns the second frequency channel to each child based on the ambient sound level of each child device. Assign to the machine.

  For example, the assigning unit assigns the second frequency channel for transmission of the second monitoring information only to the child device that has collected a sound whose level is equal to or higher than a predetermined threshold. As a result, the mobile monitoring system can efficiently receive the second monitoring information even if the number of available frequency channels is limited.

  The first monitoring information acquisition unit includes a positioning unit that positions the own device, acquires position information of the own device measured by the positioning unit as first monitoring information, and the allocating unit includes a plurality of positions close to each other. The second frequency channel may be assigned only to any one of the slave units.

  A plurality of slaves close to each other pick up substantially the same ambient sound. Therefore, in this aspect, an increase in the number of second frequency channels can be suppressed by assigning the second frequency channel only to one slave unit among a plurality of slave units that collect substantially the same ambient sound.

  Further, the master unit may include a display unit that displays at least one of the second frequency channel and the level of ambient sound of each slave unit.

  In addition, a mode in which the parent device does not assign the second frequency channel and the second frequency channel used by the child device itself may be determined. For example, the first wireless communication unit may detect an empty frequency channel and set the detected empty frequency channel as the second frequency channel.

  In addition, the first wireless communication unit, when the ambient sound level of the slave unit is greater than or equal to a predetermined amount (for example, when the ambient sound level is greater than a predetermined threshold or when the ambient sound is collected at a predetermined frequency or more) In addition, it is preferable that the detected vacant frequency channel is the second frequency channel.

  Further, the present invention is not limited to the monitoring system for moving bodies, but may be a slave unit, a master unit, and a program executed on the master unit.

  According to the present invention, the parent device can receive a plurality of pieces of monitoring information from each child device without transmitting a designation signal that designates monitoring information to be transmitted.

It is a figure which shows the main structures of the monitoring system for moving bodies which concerns on embodiment of this invention. (A) is an external view of the parent device, and (B) is an external view of the child device. (A) is a block diagram showing the configuration of the parent device, and (B) is a block diagram showing the configuration of the child device. It is a figure which shows each operation | movement for every time of a main | base station and each subunit | mobile_unit. It is a flowchart which shows each operation | movement of a main | base station and each subunit | mobile_unit for demonstrating the allocation process of the channel for transmission of ambient sound information. It is a figure which shows the example of a display of the main | base station after the channel for transmission of surrounding sound information is allocated. It is a flowchart which shows each operation | movement of a subunit | mobile_unit and a main | base station for demonstrating the allocation process which concerns on the modification 1 of the allocation process of the channel for transmission of ambient sound information. (A) is a figure which shows each position of a main | base station and each subunit | mobile_unit for demonstrating the allocation process which concerns on the modification 2, (B) is a main | base station for demonstrating the said allocation process, It is a flowchart which shows each operation | movement of a subunit | mobile_unit. It is a flowchart which shows each operation | movement of a main | base station and a subunit | mobile_unit when a subunit | mobile_unit determines the channel for transmission of ambient sound information.

  FIG. 1 is a diagram showing a main configuration of a mobile monitoring system (multichannel communication system) 1 according to an embodiment of the present invention. The moving body monitoring system 1 includes a parent device 10 and a plurality of child devices (in this example, a child device 20A, a child device 20B, and a child device 20C). The master 10 is held by a hunter 901 who is a user.

  The child machine 20A, the child machine 20B, and the child machine 20C are attached to a hound 902A, a hound 902B, and a hound 902C, which are moving objects (organisms) to be monitored, respectively. The master unit 10, the slave unit 20A, the slave unit 20B, and the slave unit 20C have a wireless communication function. The master unit 10, the slave unit 20A, the slave unit 20B, and the slave unit 20C have a function of receiving a positioning signal (for example, a GPS signal) broadcast by the positioning satellite SAT and acquiring position information by performing positioning. The slave unit 20A, the slave unit 20B, and the slave unit 20C have a function of collecting ambient sounds of the own unit. The position information of the slave unit 20A, the slave unit 20B, and the slave unit 20C corresponds to monitoring information of a hound. Information related to ambient sounds collected by the slave unit 20A, the slave unit 20B, and the slave unit 20C also corresponds to the monitoring information of the hound. However, although illustration is omitted, actually, the slave unit 20A, the slave unit 20B, and the slave unit 20C acquire the position information of the own unit by receiving a plurality of positioning signals from a plurality of positioning satellites SAT. To do.

  2A is an external view of base unit 10, and FIG. 3A is a block diagram showing the configuration of base unit 10. As shown in FIG.

  The base unit 10 includes a control unit 111, a GPS reception unit 112, a wireless communication unit 113, a battery 114, a storage unit 115, an operation unit 116, a display unit 117, a speaker 118, a modem unit 119, a GPS reception antenna 121, and a wireless communication unit. An antenna 131 is provided.

  Connected to the control unit 111 are a GPS reception unit 112, a battery 114, a storage unit 115, an operation unit 116, a display unit 117, and a modem unit 119. The battery 114 supplies power to the other parts of the parent device 10.

  The control unit 111 controls the entire base unit 10. The control unit 111 performs various operations by executing the operation program stored in the storage unit 115. For example, the control unit 111 performs an operation of changing an image displayed on the display unit 117 in accordance with a user operation received by the operation unit 116. Note that the storage unit 115 also functions as a temporary memory used when the operation program is executed. In addition, the storage unit 115 stores various types of information (for example, position information of each slave unit) acquired by the control unit 111.

  The GPS receiving unit 112 is connected to the GPS receiving antenna 121. The GPS receiver 112 measures the base unit 10 and acquires position information. Specifically, the GPS receiving unit 112 acquires the position information of the own device by calculation based on a plurality of positioning signals received by the GPS receiving antenna 121. The acquired position information is output to the control unit 111.

  The control unit 111 reads the map data stored in the storage unit 115 and causes the display unit 117 to display a map image. In addition, the control unit 111 displays the position of the parent device 10 on the map based on the position information acquired from the GPS receiving unit 112.

  The wireless communication unit 113 is connected to the wireless communication antenna 131. The wireless communication unit 113 receives various modulated information transmitted from the slave unit 20A, the slave unit 20B, and the slave unit 20C, and outputs the received information to the modem unit 119. The modem unit 119 demodulates the received various information and outputs the demodulated information to the control unit 111.

  For example, the location information of the slave unit 20A, the slave unit 20B, and the slave unit 20C is transmitted from the slave unit 20A, the slave unit 20B, and the slave unit 20C. The control unit 111 causes the display unit 117 to display the position of each slave unit on the map image based on the received position information. Also, the ambient sound information of the slave unit 20A, the slave unit 20B, and the slave unit 20C is transmitted from the slave unit 20A, the slave unit 20B, and the slave unit 20C. When the ambient sound information is demodulated by the modem 119, the ambient sound is output from the speaker 118.

  The wireless communication unit 113 transmits various types of information to the child device 20A, the child device 20B, and the child device 20C via the wireless communication antenna 131. Specifically, the control unit 111 outputs various information to be transmitted to the modem unit 119. The modem unit 119 modulates various information and outputs the modulated information to the wireless communication unit 113. Information transmitted to the slave unit 20A, the slave unit 20B, and the slave unit 20C includes setting information (time slot information to be used). Note that the modulation by the modem 119 may be analog modulation or digital modulation.

  The wireless communication unit 113 communicates with the child device 20A, the child device 20B, and the child device 20C on the frequency channel indicated by the channel switching signal output from the control unit 111.

  FIG. 2B is an external view of the slave unit 20A, and FIG. 3B is a block diagram illustrating a configuration of the slave unit 20A. 2B and 3B, the slave unit 20A is representatively shown, but the slave unit 20A, the slave unit 20B, and the slave unit 20C have the same configuration and the same function.

  The subunit | mobile_unit 20A is provided with the control part 211, the GPS receiving part 212, the radio | wireless communication part 213, the battery 214, the memory | storage part 215, the microphone 216, the modem part 217, the GPS receiving antenna 221, and the antenna 231 for radio | wireless communication.

  The control unit 211 is connected to a GPS receiving unit 212, a battery 214, a storage unit 215, and a modem unit 217. The battery 214 supplies power to the other units of the child device 20A.

  The control unit 211 controls the entire slave unit 20A. The control unit 211 performs various operations by executing the operation program stored in the storage unit 215. Note that the storage unit 215 also functions as a temporary memory used when the operation program is executed.

  The GPS receiving unit 212 is connected to the GPS receiving antenna 221. The GPS receiving unit 212 measures the slave unit 20A and acquires position information. Specifically, the GPS receiving unit 212 acquires the position information of the own device by calculation based on a plurality of positioning signals received by the GPS receiving antenna 221. The acquired position information is output to the control unit 211.

  The control unit 211 temporarily stores the position information acquired from the GPS reception unit 212 in the storage unit 215. Then, the control unit 211 reads out the position information at a predetermined timing and outputs it to the modem unit 217. The modem 217 modulates the position information output from the control unit 211 and outputs the modulated position information to the wireless communication unit 213.

  The microphone 216 collects the ambient sound of the child device 20A. The ambient sound collected by the microphone 216 is output to the modem unit 217. The modem 217 modulates the ambient sound and outputs the modulated ambient sound information to the wireless communication unit 213.

  Note that the modulation of the position information and the ambient sound information by the modem 217 may be analog modulation or digital modulation.

  The wireless communication unit 213 receives various modulated information transmitted from the parent device 10 and outputs the information to the modem unit 217. The modem unit 217 demodulates various received information and outputs the demodulated information to the control unit 211.

  The wireless communication unit 213 communicates with the parent device 10 on the frequency channel indicated by the channel switching signal output from the control unit 211.

  In the present embodiment, for example, wireless communication is performed according to a standard of a plurality of channels in a 150 MHz band. Transmission / reception of hound position information is performed by time division multiple access using time slots. The transmission / reception of ambient sound information of hunting dogs is performed by combining time division multiple access and channel switching. However, a channel is a frequency assigned, and a time slot is a time interval.

  In the present embodiment, the position information of the hound and the ambient sound information of the hound are transmitted / received through different channels. Hereinafter, transmission / reception of hound position information and hound ambient sound information will be described with reference to FIG. FIG. 4 is a diagram illustrating each operation of the parent device 10, the child device 20A, the child device 20B, and the child device 20C for each time.

  In the time-division multiple access, the slave unit 20A, the slave unit 20B, and the slave unit 20C transmit their own location information to the master unit 10 in the time slots assigned to the respective units. In the example shown in FIG. 4, a time slot SL2 is assigned to the slave unit 20A. The time slot SL3 is assigned to the child device 20B. The time slot SL4 is assigned to the child device 20C. The time slot SL1 is assigned to the parent device 10. The time slot allocation information is set in advance in the parent device 10, the child device 20A, the child device 20B, and the child device 20C. Also, the time slots SL5 to SL25 are not assigned to any slave unit for transmitting position information.

  With respect to time slot synchronization, the master unit 10, the slave unit 20A, the slave unit 20B, and the slave unit 20C measure each time slot with reference to the GPS synchronization timing every predetermined time (for example, every 5 seconds). Specifically, control unit 111 of base unit 10 measures each time slot with reference to the GPS synchronization timing based on the synchronization signal output from GPS reception unit 112. The control unit 211 of the slave unit 20A, the slave unit 20B, and the slave unit 20C measures each time slot based on the GPS synchronization timing based on the synchronization signal output from the GPS reception unit 212. The synchronization of the time slots in the master unit 10, the slave unit 20A, the slave unit 20B, and the slave unit 20C is extremely accurate because the synchronization signal is based on accurate time data included in the positioning signal.

  Base unit 10 transmits patrol signal P to handset 20A, handset 20B, and handset 20C in time slot SL1. The patrol signal P includes setting information such as wireless communication parameters. The setting information includes, for example, information on available time slots.

  Slave unit 20A transmits the location information of slave unit 20A to master unit 10 in assigned time slot SL2. The subunit | mobile_unit 20B transmits the positional information on the subunit | mobile_unit 20B to the main | base station 10 by time slot SL3 allocated. Slave unit 20C transmits the location information of slave unit 20C to master unit 10 in assigned time slot SL4.

  Here, in the mobile monitoring system 1 according to the present embodiment, the slave unit 20A, the slave unit 20B, and the slave unit 20C switch channels in at least one time slot other than the assigned time slot. Sends ambient sound information.

  In the example shown in FIG. 4, slave unit 20A transmits the position information of slave unit 20A on channel 1 in time slot SL2, and transmits ambient sound information on slave unit 20A on channel 2 in time slots SL3 to SL25. Similarly, handset 20B transmits position information of handset 20B on channel 1 in time slot SL3, and transmits ambient sound information on handset 20B on channel 3 in time slots SL2, 4-25. Slave unit 20C transmits the position information of slave unit 20C on channel 1 in time slot SL4, and transmits ambient sound information on slave unit 20C on channel 4 in time slots SL2, 3, and 5-25. However, the channel for transmitting ambient sound information need not be different for each slave unit.

  In time slots SL <b> 2 to SL <b> 4, base unit 10 receives position information of handset 20 </ b> A, handset 20 </ b> B, and handset 20 </ b> C on channel 1 from handset 20 </ b> A, handset 20 </ b> B, and handset 20 </ b> C. Master unit 10 switches from channel 1 to another channel in time slots SL5 to SL25 other than time slots SL2 to SL4 for receiving position information, and receives ambient sound information of any slave unit. In the example shown in FIG. 4, base unit 10 receives ambient sound information of slave unit 20A from slave unit 20A on channel 2 in time slots SL5 to SL25. As a result, the hunter 901 listens to the cry of the hunting dog 902A to which the child machine 20A is attached.

  When the operation unit 116 receives a channel switching operation, the control unit 111 outputs a channel switching signal to the wireless communication unit 113. The wireless communication unit 113 switches the channel received in the time slots SL5 to SL25 to the channel indicated by the switching signal. Thereby, the main | base station 10 receives the surrounding sound information of either the subunit | mobile_unit 20B or the subunit | mobile_unit 20C. However, base unit 10 may automatically switch channels received in time slots SL5 to SL25 without receiving an operation.

  In the mobile monitoring system 1 according to the present embodiment, the slave unit 20A, the slave unit 20B, and the slave unit 20C transmit position information on the channel 1 and transmit ambient sound information on the channels 2 to 4. 10 can receive each position information and each ambient sound information only by switching the channel.

  Further, even if a parent device different from the parent device 10 is provided with reception functions for channels 2 to 4, it is possible to receive ambient sound information of the child device 20A, the child device 20B, and the child device 20C. Accordingly, a hunter different from the hunter 901 can hear the squeaks of the hunting dog 902A, the hunting dog 902B, and the hunting dog 902C by holding the parent machine.

  In the present embodiment, position information and ambient sound information are used as monitoring information. However, the monitoring information may be information on the status of the slave unit (main body temperature, remaining battery level, etc.).

  Next, the processing for assigning a channel for transmitting ambient sound information will be described with reference to FIG. FIG. 5 is a flowchart showing each operation of the parent device 10, the child device 20A, and the child device 20B in the processing for assigning the channel for transmitting ambient sound information. However, in FIG. 5, since the operation of the child device 20C is the same as the operation of the child device 20A and the child device 20B, the description of the operation of the child device 20C is omitted.

  In the example shown in FIG. 4, the channel for transmitting ambient sound information is set in advance in the master unit 10 and each slave unit, and is fixed. However, in the flowchart shown in FIG. Is dynamically changed.

  However, the slave unit 20A, the slave unit 20B, and the slave unit 20C each transmit only the position information without transmitting the ambient sound information to the master unit 10 before assigning the channel for transmitting the ambient sound information. Shall.

  Specifically, as shown in FIG. 5, when handset 20A picks up the ambient sound (S21), it transmits the level (mV) information of the picked up ambient sound to base unit 10 (S22). For example, the slave unit 20A adds the level information of the ambient sound to the position information and transmits it to the master unit 10 when transmitting the location information of the slave unit 20A on the channel 1. However, transmission of ambient sound level information is not limited to this timing, and may be performed in empty time slots.

  Similarly, handset 20B collects ambient sound (S21), and transmits level information of the collected ambient sound to base unit 10 (S22).

  The base unit 10 receives ambient sound level information from the handset 20A, handset 20B, and handset 20C (S11). Then, base unit 10 assigns a channel for transmitting ambient sound information to each handset based on each level information (S12). The base unit 10 transmits the channel assignment information of the ambient sound information to the handset 20A, handset 20B, and handset 20C (S13). For example, base unit 10 transmits the surrounding sound information transmission channel assignment information by including it in patrol signal P transmitted in time slot SL1.

  When the slave unit 20A, the slave unit 20B, and the slave unit 20C receive the transmission channel assignment information of the ambient sound information (S12), the slave units 20A, 20B, and 20C are assigned to their own units in time slots other than the time slot that transmits the position information. Send ambient sound information on the channel.

  For example, the control unit 111 of the parent device 10 assigns a channel only to a child device having a level equal to or higher than a predetermined threshold (mV) (S12). Thereby, even if only two channels can be used as a channel for transmitting ambient sound information, master device 10 can assign a channel only to the slave device that makes a call or the like.

  In addition, when the number of slave units having a level equal to or higher than a predetermined threshold is greater than the number of available channels, the control unit 111 of the master unit 10 may assign channels in descending order of slave units (S23). Thereby, the main | base station 10 can allocate a channel only to the subunit | mobile_unit which makes a loud cry.

  Further, since the parent device 10 centrally manages the transmission channels for ambient sound information, even if the transmission channel for ambient sound information is dynamically changed, the surroundings from the child devices 20A, 20B, and 20C Transmission of sound information does not collide with each other.

  For example, when assigning channels in descending order of slave units, the master unit 10 performs the display shown in FIG. FIG. 6 is a diagram showing a display example of base unit 10 after the transmission channel of ambient sound information is assigned.

  As illustrated in FIG. 6, the control unit 111 includes an image 800A, an image 800B, and an image showing a hound 902A, a hound 902B, and a hound 902C on which a child device 20A, a child device 20B, and a child device 20C are mounted on a map image. 800C is displayed on the display unit 117. The control unit 111 displays the image 800A, the image 800A2, and the image 800A3 that indicate the channels assigned to the slave units corresponding to the images, together with the image 800A, the image 800B, and the image 800C. For example, the image 800A1 indicates that channel 3 is assigned as a channel for transmitting ambient sound information to the child device 20A corresponding to the hound image 800A. The hunter 901 can confirm the position of each hound and the channel of the ambient sound corresponding to each hound.

  When the level of the ambient sound of the child device 20C corresponding to the image 800C is the highest, as shown in FIG. 6, the control unit 111 further displays the display 800C2 indicating that the ambient sound level is the maximum together with the image 800C. Display.

  Next, channel assignment processing according to Modification 1 of the transmission channel assignment processing of ambient sound information shown in FIG. 5 will be described with reference to FIG. FIG. 7 is a flowchart showing each operation of the parent device 10 and the child device 20A for explaining the processing for assigning the channel for transmission of ambient sound information according to the first modification. However, since each operation of the slave unit 20B and the slave unit 20C is the same as that of the slave unit 20A, FIG. 7 shows only the operation of the slave unit 20A as a representative.

  The assignment process shown in FIG. 7 is different from the assignment process shown in FIG. 5 in that each child device performs an assignment process of a channel for transmitting ambient sound information.

  Slave device 20A collects ambient sounds (S41), and collects ambient sounds when the ambient sound level is equal to or higher than a predetermined amount (for example, when the ambient sound level is higher than a predetermined threshold, or at a predetermined frequency or higher). (S42: YES), a channel for transmitting ambient sound information is allocated (S43), and the allocation information is transmitted to the parent device 10 (S44). This allocation information is transmitted to the parent device 10 in a time slot for transmitting position information on channel 1. However, the transmission of the allocation information is not limited to this timing and this channel, but may be performed using an empty time slot or an empty channel. The base unit 10 receives the allocation information transmitted from the slave unit 20A (S31).

  The subunit | mobile_unit 20A returns to step S41, and collects an ambient sound, when the level of the collected ambient sound is less than predetermined amount (S42: NO).

  As described above, the assignment process according to the first modification can be performed by determining the ambient sound level of each child device on each child device side instead of each parent device 10 side, or by determining each child device based on the level of each ambient sound. Channels can be assigned.

  Next, the assignment process according to the modified example 2 will be described with reference to FIGS. 8A and 8B. FIG. 8A is a diagram illustrating positions of the parent device 10, the child device 20A, the child device 20B, and the child device 20C for explaining the assignment process according to the second modification. FIG. 8B is a flowchart illustrating operations of the parent device 10 and the child device 20A for explaining the assignment process according to the second modification. However, since the operations of the child device 20B and the child device 20C are the same as the operation of the child device 20A, FIG. 8B shows only the operation of the child device 20A as a representative.

  As shown in FIG. 8A, when the child device 20B and the child device 20C are close to each other, the parent device 10 groups the child device 20B and the child device 20C, and the ambient sound is transmitted only to one of the child devices in the group. Assign a channel for sending information.

  Specifically, as shown in FIG. 8B, the slave unit 20A transmits the position information of the slave unit to the master unit 10 by time division multiple access (S61). When receiving the position information transmitted from each child device 20A (S51), parent device 10 calculates the distance between each child device (S52). Then, base unit 10 groups slave units 20B and 20C that are close to each other, and assigns channels (S53).

  Regarding the operation of step 53, specifically, as shown in FIG. 8A, the base unit 10 has a distance d1 between the handset 20B and the handset 20C that is shorter than a predetermined threshold (for example, 50 meters). The slave unit 20B and the slave unit 20C are grouped. Since the distance d2 between the child device 20A and the child device 20B is longer than the threshold, the parent device 10A does not group the child device 20A and the child device 20B. Then, parent device 10 assigns a channel only to one of the child devices 20A and 20B in the group.

  Thereafter, the base unit 10 transmits the channel assignment information of the ambient sound information to each handset (S54). The subunit | mobile_unit 20A receives channel allocation information (S62).

  In the allocation process according to the second modification, the mobile monitoring system 1 is a plurality of slave units that are close to each other, and only a single slave unit is surrounded by a plurality of slave units that collect substantially the same ambient sound. Since the channels for transmitting sound information are allocated, the number of channels to be used can be reduced.

  In addition, the main | base station 10 may perform grouping of a subunit | mobile_unit, without using each position information. For example, base unit 10 obtains a correlation between ambient sound information based on a frequency characteristic parameter obtained by performing Fourier transform on the ambient sound information of each handset, and groups the highly correlated handset groups.

  In the above example, the parent device 10 determines the channel for transmitting the ambient sound information. However, the child device 20A, the child device 20B, and the child device 20C may determine the channel.

  An example in which the slave unit 20A, the slave unit 20B, and the slave unit 20C themselves determine a channel for transmitting ambient sound information will be described with reference to FIG. FIG. 9 is a flowchart showing each operation of the slave unit 20A and the master unit 10 when the slave unit 20A determines a channel for transmitting ambient sound information. However, FIG. 9 shows the operation of the child device 20A as a representative, but the operations of the child device 20B and the child device 20C are the same as the operation of the child device 20A.

  As shown in FIG. 9, the slave unit 20A performs carrier sense (S1). Specifically, the wireless communication unit 213 of the slave unit 20A attempts to detect radio waves in a plurality of channels of 150 MHz band. Then, the wireless communication unit 213 outputs information on the presence / absence of radio wave detection for each channel to the control unit 211.

  Next, the control unit 211 of the slave unit 20A determines whether or not there is an empty channel (S2). Specifically, the control unit 211 uses the information on the presence / absence of radio wave detection for each channel output from the wireless communication unit 213 to identify a channel that has not received radio waves. When the channel that has not detected the radio wave can be identified, the control unit 211 determines that there is a free channel (S2: YES), and transmits information on the free channel to be used to the base unit 10 (S4). The base unit 10 receives information on an empty channel used by the slave unit 20A from the slave unit 20A (S5). However, empty channel information is transmitted and received between the parent device 10 and each child device by being added to the position information.

  When it is determined that there is no empty channel (S2: NO), slave unit 20A returns to step S1 after waiting for a random time (S3).

In the above embodiment, the moving body is a hound, but is not limited to this, and is not limited to this, but a living object such as a human being or another animal, or a movable object other than a living thing such as a car (becomes a monitoring target). Object).

DESCRIPTION OF SYMBOLS 1 ... Mobile body monitoring system 10 ... Master unit 20A, 20B, 20C ... Slave unit 111 ... Control unit 112 ... GPS receiving unit 113 ... Wireless communication unit 114 ... Battery 115 ... Storage unit 116 ... Operation unit 117 ... Display unit 118 ... Speaker 119 ... Modulators / demodulators 121, 221 ... GPS reception antennas 131,231 ... Radio communication antenna 211 ... Control unit 212 ... GPS receiver 213 ... Wireless communication unit 214 ... Battery 215 ... Storage unit 216 ... Microphone 217 ... Modulator

Claims (11)

A monitoring system for a mobile unit comprising at least one slave unit mounted on a mobile unit and a master unit connected to the slave unit by wireless communication,
The slave is
A first monitoring information acquisition unit that acquires first monitoring information of a mobile body on which the device is mounted;
A second monitoring information acquisition unit for acquiring second monitoring information of the mobile body;
The first monitoring information is transmitted wirelessly in the time slot assigned to the own device, and the first monitoring information is transmitted in at least one time slot other than the time slot assigned by the own device. A first wireless communication unit for transmitting the second monitoring information on a second frequency channel different from the frequency channel;
Have
The base unit is
A second wireless communication unit for wirelessly receiving information transmitted from the slave unit;
A switching unit that switches a frequency channel of reception of the second wireless communication unit;
A monitoring system for a moving body. The mobile monitoring system according to claim 1,
The master unit has an assigning unit that assigns different frequency channels to the slave units as the second frequency channel for each slave unit,
When the first wireless communication unit receives the allocation information of the second frequency channel from the master unit, the first wireless communication unit transmits the second monitoring information on the second frequency channel. The mobile monitoring system according to claim 2,
The second monitoring information acquisition unit acquires ambient sound information of the own device as the second monitoring information,
The allocating unit allocates the second frequency channel to each slave unit based on a level of ambient sound of each slave unit, and the monitoring system for a mobile unit. It is the monitoring system for moving bodies according to claim 2 or 3,
The first monitoring information acquisition unit measures the own device, acquires the position information of the measured own device as the first monitoring information,
The mobile unit monitoring system, wherein the allocating unit allocates the second frequency channel only to any one of the handset whose positions are close to each other. The mobile monitoring system according to claim 2,
The base unit has a display unit that displays at least one of the second frequency channel and the level of ambient sound of each handset. The mobile monitoring system according to claim 1,
The first wireless communication unit detects a vacant frequency channel and uses the detected vacant frequency channel as the second frequency channel. The mobile monitoring system according to claim 6,
The mobile radio monitoring system, wherein the first wireless communication unit sets the detected vacant frequency channel as the second frequency channel when the ambient sound level of the slave unit is a predetermined amount or more. It is the monitoring system for moving bodies in any one of Claims 1-7,
The first wireless communication unit and the second wireless communication unit are monitoring systems for mobile objects that are synchronized based on time data included in a positioning signal broadcast from a satellite. A slave unit that is attached to a mobile unit and connected to the master unit by wireless communication,
A first monitoring information acquisition unit for acquiring first monitoring information of the mobile body;
A second monitoring information acquisition unit for acquiring second monitoring information of the mobile body;
The first monitoring information is transmitted wirelessly in a time slot assigned to the own device, and the first frequency of transmission of the first monitoring information is transmitted in at least one time slot other than the time slot assigned by the own device. A first wireless communication unit for transmitting the second monitoring information on a second frequency channel different from the channel;
A handset equipped with. A master unit connected by wireless communication with at least one slave unit mounted on a mobile body;
The first monitor information of the mobile unit is received from each slave unit in a time slot corresponding to each slave unit, and the second monitor information of the mobile unit is received from the slave unit as a first frequency channel for receiving the first monitor information A master unit including a receiving unit that receives a second frequency channel different from the first frequency channel. A program to be executed by a parent device connected by wireless communication with at least one child device mounted on a mobile body,
Receiving first monitoring information of the mobile unit from the slave unit in a time slot corresponding to the slave unit;
Receiving the second monitoring information of the mobile unit from the slave unit on a second frequency channel different from the first frequency channel of receiving the first monitoring information;
Is a program that causes the base unit to execute.