KR101885867B1 - Wireless communication method of measuring equipment and control equipment - Google Patents

Abstract

The present invention relates to a wireless communication method for an instrumentation device and a control device. According to the present invention, the wireless communication method for an instrumentation device and a control device sets frequencies by dividing the frequencies by each channel in an allocated frequency band and allocates the predetermined channel among the channels which are set, to the channel requesting data communications. Also, the wireless communication method for an instrumentation device and a control device searches the channel which can be used in accordance with a request and transmits data to and receives data from the corresponding channel when there is a channel which can be used as a search result. So, the wireless communication method for an instrumentation device and a control device can perform wireless communications by multiple instrumentation devices and a control device in the allocated frequency band. According to the present invention, the wireless communication method for an instrumentation device and control device is to control mechanical facilities by receiving data detected by the instrumentation device via wireless communications with multiple instrumentation devices. The wireless communication device for an instrumentation device and control device includes a channel request step, a channel search step, a channel allocation holding step, a holding channel transmitting step, a data transmitting step, and an idle channel switching step.

Description

TECHNICAL FIELD [0001] The present invention relates to a wireless communication method of a measuring apparatus and a control apparatus,

The present invention relates to a radio communication method of a measuring apparatus and a control apparatus, and more particularly, to a radio communication method of a measuring apparatus and a control apparatus, in which a frequency is divided and set for each channel in an allocated frequency range, a specific channel is allocated as a channel for requesting data communication, A measuring device capable of performing wireless communication with a plurality of measuring devices and a control device in an allocated frequency range by transmitting and receiving data to and from a corresponding channel when there is a channel available for a search result, And a wireless communication method of the control apparatus.

Generally, plant facilities such as power plants, substations, water treatment facilities, drainage facilities, or relay pumping stations that are required to manage large facilities with difficult or small access by managers are widely distributed outside the city. In such a plant, Facilities and measuring instruments are installed. The plant is equipped with a remote control station (RCS) to operate the plant. The remote monitoring and control panel is equipped with a PLC (Programmable Logic Controller) to monitor and control the equipment through the measuring device, And transmits the data to the monitoring control computer of the central control center to monitor the situation of the site comprehensively or to control the mechanical equipment when necessary.

In this configuration, the communication between the measuring device for detecting the information of the plant facility and the control device for controlling the equipment is configured to transmit and receive data using wired communication. However, in the wired communication method described above, it is difficult to install a wired line in a wide area, and there is a problem that it takes a long time to maintain and repair the installed wired line.

A wireless communication system has been applied as a technique for solving such a problem.

The frequency band used in the wireless communication system is composed of wireless LAN, ZigBee, or Bluetooth.

Among the remote control systems using the wireless system, a meter remote control system using wireless communication is disclosed in Patent Publication No. 10-1345668.

The technique includes a plurality of meters for outputting an input signal detected through one or more sensors to a first radio signal using a predetermined first frequency band; A remote controller for receiving and analyzing the first wireless signal, converting a control signal for controlling the meter into a second wireless signal, and transmitting the second wireless signal to the plurality of meters; And a variable wireless communication module for detecting a second frequency band that does not cause interference with the first frequency band and transmitting and receiving the second wireless signal using the second frequency band, And a time division controller for switching the transmission time of the first radio signal and the transmission time of the second radio signal so that the first radio signal and the second radio signal are time-division-transmitted and received, if the second frequency band does not exist And the time-division controller includes a time-division switch including transistor elements for switching the transmission and reception times of the first radio signal and the second radio signal to be automatically switched according to the time division control signal, The first radio signal is input to the remote controller or the second frequency band The first relates to remote instrument control system using a wireless communication terminal that is output from the remote controller 2, the radio signal using a.

However, in the above-described technique, frequency allocation according to time division can be inefficiently operated in a plant environment in which a plurality of sensors and a plurality of control devices are concentrated, although the number of measuring devices is effective within a certain range. There may arise a problem that data transmission / reception between the measurement apparatus and the control apparatus is not performed smoothly.

KR 10-1345668 B1 (Dec 20, 2013)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to solve the above-mentioned problems of the related art by searching for a usable channel in a frequency range allocated only when data transmission / reception is required, And a method of wireless communication between a measuring device and a control device in which data is transmitted and received using a usable channel.

In order to solve the above problems, a wireless communication method of a measuring apparatus and a control apparatus according to the present invention is a wireless communication method of a measuring apparatus and a control apparatus, comprising a plurality of measurement apparatuses, A communication method, comprising: a channel request step in which the measurement device requests a communication channel to the control device using a request channel set among allocated channels; A channel searching step of the control device searching for an available channel in an assigned channel in a frequency range set for a channel request; A channel assignment holding step of allocating and holding a usable channel to the measurement apparatus that requests a channel when it is determined that there is a usable channel in the channel search step; A holding channel transmission step of the control device transmitting a channel held in the measurement device using the request channel to the channel held in the channel allocation and holding step; A data transmitting step of transmitting data detected using the holding channel when the measuring apparatus receives the holding channel through the holding channel transmitting step; And an idle channel switching step of switching the holding channel to an idle channel when the controller receives data from the measuring device through the holding channel.

If it is determined that there is no available channel in the channel searching step (S20), the use channel importance calculating step calculates the importance of the measuring device with respect to the used channel. An importance comparing step of comparing the importance of the measuring device having the lowest value calculated in the used channel importance calculating step with the importance of the measuring device requested in the request channel; And comparing the importance of the measuring device having the lowest value calculated in the importance comparing step with the importance of the measuring device requested in the request channel and comparing the importance of the measuring device having the calculated lowest value with the importance of the measuring device requested in the request channel And a channel forced holding step of stopping and holding the channel used by the measuring device having the calculated lowest value when the value is a low value.

As a result of comparing the importance of the measuring device having the lowest value calculated in the importance comparing step with the importance of the measuring device requested by the request channel and the importance of the measuring device having the calculated lowest value is higher than the importance of the measuring device requested in the request channel A channel request ignoring step of ignoring a communication channel request of the measuring apparatus requested by the request channel if the value is a high value.

At this time, the measuring device measures one selected from electrostatic, fire, vibration, carbon dioxide, condensation, temperature and humidity.

In addition, the wireless communication is performed by long range low power wireless communication in a frequency band of 917 to 923.5 MHz, and the bandwidth of each channel is 125 KHz.

According to the present invention, frequency utilization in an allocated frequency region is increased as a channel that is not used for data transmission / reception is switched to an idle state, so that a plurality of measurement devices can be connected to a controller in a wireless manner.

Further, since the interference between the measuring apparatus and the control apparatus can be minimized, it is possible to perform accurate measurement and increase the reliability of the detected data.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a remote monitoring and control system to which a radio communication method of a measuring apparatus and a control apparatus according to the present invention is applied. FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a remote monitoring and control system to which a wireless communication method of a measuring apparatus and a control apparatus according to the present invention is applied.
3 is a table showing a frequency for a channel in a remote monitoring and control system to which a wireless communication method of a measuring apparatus and a control apparatus according to the present invention is applied.
FIG. 4 and FIG. 5 are flowcharts of a wireless communication method of the measuring apparatus and the control apparatus according to the present invention, respectively.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

According to the present invention, a frequency is divided and set for each channel in an allocated frequency range, a specific channel is allocated as a channel for requesting data communication among the set channels, a usable channel is searched according to a request, A measurement device capable of performing wireless communication between a plurality of measurement devices and a control device in an allocated frequency range, and a wireless communication method of the control device.

1 is a block diagram of a remote monitoring and control system to which a wireless communication method of a measuring apparatus and a control apparatus according to the present invention is applied.

1, the remote monitoring and control system includes a measurement device 10, a facility control device 20, a facility device 30, a control device 40, an HMI (Human-Machine Interface) 50, (60).

At this time, the remote monitoring and control system can be applied to a system for monitoring and controlling various facilities such as a power generation facility, a substation facility, a streetlight facility, a water treatment facility, a railway facility, a petrochemical plant, a vinyl house and a housing facility.

The measuring apparatus 10 is installed in a remote facility system and performs a function of transmitting the detected environment information value through wireless communication.

2 is a block diagram illustrating a measuring apparatus according to an embodiment of the remote monitoring and control system to which the wireless communication method of the measuring apparatus and the controlling apparatus according to the present invention is applied.

2, the measuring apparatus 10 includes a sensor 11, a data converting unit 12, a communication unit 13, a memory unit 14, and a position signal processing unit 15 .

The sensor unit 11 manages settings for sensors that detect and output environmental information values. That is, the sensor unit 11 stores the sensor information and the application information corresponding to the type and specification of the sensor module that can be coupled, and receives an environment information value output from the associated sensor module You can load and activate an application.

For example, when a temperature sensor capable of detecting a temperature is combined, the sensor unit 11 acquires the sensor information for the associated temperature sensor, and loads and activates the application corresponding to the acquired sensor information. In this state, when the temperature sensor is changed to the humidity sensor, the activated application corresponding to the temperature sensor is switched to the inactive state, and the application capable of receiving the humidity sensor is loaded and activated.

The data conversion unit 12 converts the environmental information value received through the sensor module connected to the logic unit 11 into transmittable data. That is, when the received environment information value is an analog signal, the data conversion unit 12 converts the digital signal into a digital signal and outputs the digital signal in units of packets.

The signal output from the sensor is generally an analog signal. Analog signals are vulnerable because signal loss can occur during long-haul transmissions. Therefore, if the sensor is a sensor for outputting an analog signal, the data converter 12 converts the digital signal into a digital signal and outputs the digital signal by bypassing the digital signal.

The communication unit 13 requests the control device 40 for a communication channel and wirelessly transmits the data converted by the data conversion unit 12 to the allocated allocated channel according to the request.

At this time, the communication unit 13 requests a communication channel from the controller 40 using a request channel among the channels set for the frequency band stored in the memory unit 14, And transmits the converted data from the data converter 12 to the received assigned channel by radio.

The wireless communication method in the communication unit 13 may be Zigbee, RF, WiFi, 3G, 4G, LTE, LTE-A, Wireless Broadband Internet and LORA, Long Range Low Power) may be selected and used.

Among the communication methods described above, LORA is a non-standard technology using a license-exempt frequency in the UHF (Ultra High Frequency) band, easy to construct in an outdoor environment where no network is constructed, This is advantageous in that it is several to several tens of kilometers.

When the Laura scheme is used as a wireless communication, it can be configured to wirelessly transmit through a channel allocated for each frequency in a range of 917 to 923.5 MHz, and the bandwidth of each channel can be configured to be set to 125KHz, .

FIG. 3 is a table showing a frequency for a channel in a remote monitoring and control system to which a wireless communication method of a measuring apparatus and a control apparatus according to the present invention is applied.

Referring to FIG. 3, channel 0 is 921.9 MHz, channel 1 is 922.1 MHz, channel 2 is 922.3 MHz, channel 3 is 922.5 MHz, channel 4 is 922.7 MHz, channel 5 is 922.9 MHz, channel 6 is 923.1 MHz, Channel 7 may be set to 923.39 MHz, and channel 0 of the channel may be set as a request channel.

The memory unit 14 stores and manages the type of sensor coupled to the sensor unit 11, the ID of the sensor, the input / output range of the sensor, and the output method. In this case, when the sensor module coupled with the sensor unit 11 is changed, the ID of the sensor module stored in the memory unit 14, the input / output range and the output method of the sensor module are updated with the information about the changed sensor module .

On the other hand, in the case where the measuring apparatus 10 is added or changed in position as needed, a beacon receiving signal corresponding to the received beacon signal is received as a configuration for recognizing the expansion or variable position of the measuring apparatus 10 And a position signal processing unit 15 for transmitting is constituted in the measuring apparatus 10.

In addition, a plurality of beacon terminals 60 for transmitting a beacon signal to the position signal processing unit 15 are configured.

The beacon terminal 60 generates and transmits a beacon signal, and transmits the beacon signal to the beacon terminal 60. The beacon terminal 60 transmits a beacon signal to the beacon terminal 60, And transmits information.

The control device 40 detects the position of the measuring device 10 based on the transmitted beacon information and transmits the detected position of the measuring device 10 to the HMI 50. [

Here, the plurality of beacon terminals 60 are installed such that beacon signals are superimposed, and the positions of the respective beacon terminals 60 are stored and managed in a memory module of the controller 40. [

That is, the controller 40 calculates the distance of the beacon reception signal in a state of knowing the location of the beacon terminal 60, calculates the distance, and calculates a virtual radius of the calculated distance do. The control device 40 determines that a position where the radiuses calculated through the three or more beacon terminals 60 overlap is the position of the measuring device 10.

At this time, the strength of the received beacon signal is used as information for selecting the beacon terminal 60. [ That is, three beacon terminals 60 are selected in order of the received beacon reception signal intensity, and the position of the measurement apparatus 10 is detected using the beacon information transmitted from the selected beacon terminal 60 .

Accordingly, it is possible to detect the position of the measurement apparatus 10 installed in the building where GPS can not be used, and to increase the reliability of the measured detection position by using the selected beacon information according to the intensity of the beacon reception signal .

The facility apparatus 30 is installed in a remote facility and is operated in accordance with a facility control signal output from the control apparatus 40. The facility apparatus 30 is selected from devices for driving or controlling remote facilities such as cooling and heating equipment, .

The control device 40 performs wireless communication with the measurement device 10 and the facility control device 30 to receive environmental information values and transmit them through a communication network and transmits the facility control signals received via the communication network to the facility device And outputs a facility control signal for controlling the facility apparatus 30 on the basis of the set threshold values.

The control device 40 is configured with a memory module in which threshold values for environment information values are preset. That is, the control device 40 compares the threshold value of the environment information value stored in the memory module with the received environment information value, and when the environment information value received as a result of the comparison is out of the threshold value, And transmits the equipment control signal to the system control unit.

For example, when it is determined that the environment information value detected in a state where the lower limit threshold value and the upper limit threshold value are set in the case of temperature exceeds the upper limit threshold value, the control device 40 outputs the facility control signal for operating the air conditioner And output the facility control signal for operating the heater when it is determined that the detected environmental information value is less than the lower limit threshold value.

Further, when it is judged that the threshold value is over or below the specific environment information value, it can be configured to output a warning sound or a signal for generating a message such as recognizable voice, bell or buzzer.

For example, when it is determined that the detected environment information value is a power failure, the warning information may be configured to send an alarm sound indicating that the power failure has occurred.

In addition, the threshold value may be divided into a first threshold value, a second threshold value, and a third threshold value. Also, a warning sound message or the like for each threshold value can be configured to be output separately.

The facility control signal or the warning sound (or message) output from the control device 40 is configured to be transmitted to the HMI 50 via the communication network and output.

The HMI (Human-Machine Interface) 50 is connected to the radio relay device through a communication network to remotely manage the facility control device and display the state of the facility control device, and includes a management server, a mobile device, .

The mobile device may be a personal portable device capable of mobile communication, and may be configured in various ways such as a smart phone, a mobile communication terminal, a PDA, or a tablet PC. It can be composed of a fire station linked to a fire signal, KEPCO linked to a power failure, and a police station linked to an unauthorized intrusion.

Next, a wireless communication method of the measuring apparatus and the control apparatus according to the present invention will be described.

FIG. 4 and FIG. 5 are flowcharts showing a method of wireless communication between the measuring apparatus and the control apparatus according to the present invention, respectively.

4, a method of wireless communication between a measuring apparatus and a control apparatus according to the present invention includes a channel request step S10, a channel searching step S20, a channel allocation holding step S30, a holding channel transmitting step S40 ), A data transmission step (S50), and an idle channel switching step (S60).

1. Channel request step (S10)

The channel requesting step S10 is a step in which the measuring device 10 requests the control device 40 for a communication channel using a request channel set among the allocated channels.

The measuring apparatus 10 detects data on the environmental information value detected by the associated sensor and requests a channel for transmitting data to the control device 40 via a request channel to transmit the detected data .

2. Channel search step (S20)

The channel search step S20 is a step in which the control device 40 searches for a usable channel in an allocated channel in a frequency range set for the channel request.

3. Channel allocation holding step (S30)

The channel allocation holding step S30 is a step of assigning and holding a usable channel to the measurement apparatus 10 which has requested the channel when the controller 40 determines that there is a usable channel in the channel searching step S20.

That is, the process of searching for a usable channel by the controller 40 in the channel searching step S20 may include searching for an idle idle channel other than the held channel, S30), if there is an idle channel, the idle channel is allocated to a channel for communication with the measurement device 10 requested by the channel, and the allocated channel is held.

At this time, the held channel can not perform wireless communication with another measuring device.

On the other hand, if it is determined that there is a usable channel in the channel searching step (S20), it is judged to what extent the detected environment information value is located in the remote facility and whether the environment information value should be received or ignored And determines whether or not to receive the data according to the determination result.

Referring to FIG. 5, if there is no available channel in the channel searching step S20, the process is performed according to the importance of the environment information value to be received. An importance comparing step S32, a channel forced holding step S33, and a channel request ignoring step S34.

3.1. The used channel importance calculating step (S31)

If it is determined that there is no available channel in the channel searching step (S20), the step of calculating the importance of the measuring apparatus with respect to the used channel is calculated.

That is, the used channel importance calculating step S31 calculates the importance of the measuring device with respect to the entire used channel when all the channels other than the request channel are the used holding channels.

In other words, the sensors connected to the measuring apparatus 10 may be given different weightings in the remote facility, and the importance may be calculated according to the given weight. In the case where the importance is relatively high, the sensors may be preferentially received .

At this time, the calculated importance can be stored in the temporary memory.

3.2. In the importance comparison step (S32)

The importance comparing step S32 compares the importance of the measuring device having the lowest value calculated in the usage channel importance calculating step S31 with the importance of the measuring device requested by the request channel.

For example, if a total of eight channels are set as shown in FIG. 3 and seven channels other than one request channel are set as holding channels for wireless communication, the environment of the measuring apparatus 10 connected to each of the seven channels An information value is detected, a type of the detected environment information value is detected, and a degree of importance of the detected type is calculated.

 At this time, the importance can be set by the user and can be configured to be changeable by an operation signal.

That is, the importance comparison step S32 compares the type of the environment information value of the requested measurement device with the type of environmental information value of the measurement device connected to the communication and receives the measurement information. And compares the environmental information value type of the lowest level of the listed order with the environmental information value type of the requested measurement device.

3.3. The channel forced holding step (S33)

The channel forced holding step S33 is a step of comparing the importance of the measuring device having the lowest value calculated in the importance comparing step S32 and the importance of the measuring device requested by the request channel, And stopping and holding the channel used by the measurement device having the calculated lowest value when the value is relatively lower than the importance of the measurement device requested by the channel.

That is, when the importance of the requested measurement apparatus is relatively higher than the importance of the measurement apparatus having the lowest value, it is a step of closing the communication channel connected to the measurement apparatus having the lowest value so as to receive the environmental information value of the requested measurement apparatus.

Thus, the forcibly held channel is transmitted to the measuring apparatus (S40).

3.4. The channel request ignoring step (S34)

The channel request ignoring step S34 is a step of comparing the importance of the measuring device having the lowest value calculated in the importance comparing step S32 and the importance of the measuring device requested by the request channel, And ignoring the communication channel request of the measurement device requested by the request channel if the value is relatively higher than the importance of the measurement device requested by the channel.

That is, if the type of the environment information value detected by the currently connected measurement apparatus 10 is relatively more important than the environmental information value of the requested measurement apparatus, the channel information request unit 20 ignores the channel request and continuously receives the environment information value currently being received .

The sensors that can be coupled to the measuring device 10 may be selected from among electrostatic, fire, vibration, carbon dioxide, condensation, temperature and humidity, and environmental information values such as condensation, temperature, Vibration, and the like. Accordingly, when the environment information value has a relatively high value, it can be configured to receive the environment information value so that quick response can be made in an emergency.

4. Holding channel transmission step (S40)

The holding channel transmission step S40 is a step in which the control device 40 transmits a channel held by the measurement device using the request channel to the channel held in the channel allocation and holding step S30.

That is, information on the holding channel is transmitted from the controller 40 to the measuring apparatus 10 using the request channel.

5. Data transmission step (S50)

The data transmission step S50 is a step of transmitting the detected data using the holding channel to the control device 40 when the measuring device 10 receives the holding channel through the holding channel transmitting step S40.

That is, the control device 40 sets the holding channel as a channel for performing wireless communication with the measuring device 10, and transmits data on environmental information values wirelessly transmitted from the measuring device 10 to the holding channel .

The control device 40 receiving the data compares the threshold value of the environment information value stored in the memory module with the received environment information value and when the received environment information value is out of the threshold value as a result of the comparison, And outputs a facility control signal to be included in the value range. In addition, the control device 40 transmits the received data and the control result to the HMI 50.

6. Idle channel switching step (S60)

And switching the holding channel to an idle channel when the controller receives data from the measuring device through the holding channel.

The channel switched to the idle channel is searched by the usable channel at the request of the measurement apparatus 10. [

According to the present invention, frequency utilization in an allocated frequency region is increased as a channel that is not used for data transmission / reception is switched to an idle state, so that a plurality of measurement devices can be connected to a controller in a wireless manner.

Further, since the interference between the measuring apparatus and the control apparatus can be minimized, it is possible to perform accurate measurement and increase the reliability of the detected data.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: Measuring device 20: Equipment control device
30: facility device 40: control device
50: HMI 60: Beacon terminal

Claims (5)

A wireless communication method of a measuring device and a control device including a plurality of measuring devices, a control device for controlling the machine equipment by receiving data detected by the measuring device by wireless communication, and a beacon terminal,
A channel request step in which the measurement device requests a communication channel to the control device using a request channel set in the assigned channel;
A channel searching step of the control device searching for an available channel in an assigned channel in a frequency range set for a channel request;
A channel assignment holding step of allocating and holding a usable channel to the measurement apparatus that requests a channel when it is determined that there is a usable channel in the channel search step;
A holding channel transmission step of the control device transmitting a channel held in the measurement device using the request channel to the channel held in the channel allocation and holding step;
A data transmitting step of transmitting data detected using the holding channel when the measuring apparatus receives the holding channel through the holding channel transmitting step; And
An idle channel switching step of switching the holding channel to an idle channel when the controller receives data from the measuring device through the holding channel;
Lt; / RTI >
A use channel importance calculating step of calculating an importance of the measuring apparatus with respect to a channel being used if it is determined that there is no available channel in the channel searching step;
An importance comparing step of comparing the importance of the measuring device having the lowest value calculated in the used channel importance calculating step with the importance of the measuring device requested in the request channel;
As a result of comparison between the importance of the measuring device having the lowest value calculated in the importance comparing step and the importance of the measuring device requested by the request channel and the importance of the measuring device having the calculated lowest value is relatively lower than the importance of the measuring device requested in the request channel A channel forced holding step of stopping and holding the channel used by the measuring apparatus having the calculated lowest value; And
As a result of comparing the importance of the measuring device having the lowest value calculated in the importance comparing step with the importance of the measuring device requested by the request channel and the importance of the measuring device having the calculated lowest value is relatively higher than the importance of the measuring device requested in the request channel A channel request ignoring step of ignoring a communication channel request of the measurement apparatus requested by the request channel;
Lt; / RTI >
The beacon terminal includes:
The beacon signal is generated and transmitted to the position signal processor, and the time of the received beacon received signal with respect to the beacon signal transmitted from the position signal processor, the intensity of the beacon received signal, A plurality of beacon signals to be transmitted are superimposed on one another,
The measuring device includes:
A sensor which stores an application corresponding to sensor information and sensor information about a type and a specification of the sensor module and loads and activates an application capable of receiving environmental information values output from the sensor module;
Converts the environmental information value received through the sensor module connected to the sensor to data that can be transmitted, converts the received environmental information into an analog signal if the received signal is an analog signal, and outputs the converted digital signal when the digital signal is a digital signal A data converter;
The control unit requests a communication channel from the set channel for the stored frequency band using the request channel, and when receiving the allocation channel from the control unit, A communication unit for transmitting;
A memory unit for storing and managing the type of sensor coupled with the sensor, the ID of the sensor, the input / output range of the sensor, the output method, and the frequency band; And
A position signal processing unit for transmitting a beacon reception signal corresponding to the received beacon signal to recognize the extension or variable position of the measurement apparatus;
The data conversion unit converts the detected data into the digital signal and requests the control unit through the communication unit to request a channel. Receiving the holding channel from the control apparatus, transmitting the environment information value and the beacon information received through the position signal processing unit to the control apparatus using the received holding channel,
The control device includes:
Calculating a distance of the received beacon signal in a state where the position of the beacon terminal is known, calculating a virtual radius of the calculated distance, Selects three beacon terminals, detects the position of the measuring apparatus using beacon information transmitted from the selected beacon terminal,
In the wireless communication,
And the bandwidth of each channel is set to 125 KHz. The channel 0 is set to 921.9 MHz, the channel 1 is set to 922.1 MHz, the channel 2 is set to 922.3 MHz, the channel 3 Is set to 922.5 MHz, channel 4 is 922.7 MHz, channel 5 is 922.9 MHz, channel 6 is 923.1 MHz, and channel 7 is 923.39 MHz, and channel 0 is set as a request channel. / RTI >
delete delete The method according to claim 1,
The measuring device includes:
Wherein the selected one is selected from the group consisting of power failure, fire, vibration, carbon dioxide, condensation, temperature and humidity.
delete

Images