JP7168536B2 - Radio wave measurement system, radio wave measurement device, radio wave measurement method, and radio wave measurement program - Google Patents

Description

The present invention relates to technology for measuring radio wave reception characteristics in a closed space.

In recent years, IoT (Internet of Things) has progressed, and sensors, control units, and the like are installed in various places, and these are often connected to networks by wireless communication. For example, in the pipe space (pipe shaft) of a building, meters for electricity, gas, water, etc. connected to wireless communication devices (terminals, subunits, etc.) are installed, and the results of automatic meter reading of the meters are sent via wireless communication. may be collected. In addition, inventory and sales information of products may be collected via wireless communication using a wireless communication device housed in a metal housing of a vending machine or the like. A space that can be opened and closed (hereinafter also referred to as "opening and closing") by human operation, such as a pipe space or a metal housing, and is normally closed (with the exception of maintenance, etc.) (hereinafter , called “enclosed space”), the reception strength of radio waves is often weak. Here, the human operation is, for example, the operation of opening and closing the door of the closed space.

Radio waves of various frequency bands are used for wireless communication. In particular, when using radio waves in a frequency band such as the sub-gigahertz band, radio waves are highly diffractive, so in anticipation of radio wave diffraction and reflection, wireless communication devices are often installed in places where there is no line of sight. . In this case, contrary to expectations, the strength of radio waves may be weak and wireless communication may not be possible.

An example of technology for stably receiving radio waves is disclosed in Patent Document 1. The portable information terminal of Patent Document 1 includes one external antenna (omnidirectional antenna), three internal antennas (directional antenna), a manual switch, a first switch, a comparison circuit, and a second switch. and a signal processing unit. Of the three internal antennas, one antenna is arranged in the long side direction of a plane (rectangular parallelepiped) of the portable information terminal, another antenna is arranged in the short side direction of the plane, and the remaining antennas are is arranged in the diagonal direction of the surface. A first switch enables input from the internal antenna in response to operation of the manual switch. The comparison circuit compares the reception sensitivities of radio waves from the three internal antennas. A second switch selects one internal antenna from the three internal antennas. Normally, a signal received by an external antenna is input to the signal processing section. By operating the manual switch, the signal received by the internal antenna is input to the signal processing section. At this time, among the three internal antennas, the signal is selectively input from the internal antenna that receives radio waves with the maximum reception sensitivity. As a result of the above configuration, the portable information terminal of Patent Document 1 stably receives radio waves.

In this way, the reception strength of radio waves varies depending not only on the installation position of the antenna, but also on the orientation of the antenna. In wireless communication between the inside and the outside of a closed space, the reception strength of radio waves is particularly weak. Therefore, in a closed space, it is necessary to arrange the wireless communication device at a suitable position including the orientation of the antenna so that the diffracted and reflected radio waves can be effectively used.

Objects that reflect, diffract, attenuate, or block radio waves (pipes installed in pipe shafts, objects stored in metal housings, etc.) are often installed in actual closed spaces. In addition, in an actual closed space, radio waves may reach the interior through gaps (vents, windows, etc.) that exist at the boundary of the closed space, and radio waves may pass through the boundary (concrete wall) of the closed space into the interior. There are many.

Therefore, when determining the installation position of the wireless communication device by simulating radio wave propagation, it is difficult to collect the simulation conditions, or the accuracy of the simulation results is insufficient due to the discrepancy between the actual closed space and the simulation conditions. There is a problem.

Therefore, when installing a wireless communication device in a closed space, it is desirable to measure the actual reception characteristics of radio waves in the closed space and then install the wireless communication device in a position where the reception characteristics of radio waves in the closed space are good. .

An example of technology for facilitating radio wave measurement in a closed space is disclosed in Patent Document 2. The meter reading data transmission system of Patent Literature 2 includes a parent device, a child device A, and a child device B. The parent machine and child machine A are installed outside the pipe shaft. The child machine B is installed inside the pipe shaft. The child device A remotely operates the child device B. When the remote button of slave device A is pressed, slave device A transmits a test radio wave transmission signal to slave device B. When slave device B receives the test radio wave transmission signal, slave device B starts a radio wave test with the master device. Handset B transmits the test result to handset A upon completion of the radio wave test. Handset A displays the received test results. As a result of the above configuration, the meter reading data transmission system of Patent Literature 2 facilitates the radio wave test.

Another example of technology for facilitating radio wave measurement in a closed space is disclosed in Patent Document 3. The automatic meter reading system of Patent Document 3 includes a meter device, a wireless slave device, a wireless master device, and a monitoring center. The wireless slave unit is connected to a meter device for automatic meter reading. The radio base station is connected to the monitoring center via a communication line. Upon receiving the field strength measurement request from the monitoring center, the radio slave device and the radio master device measure the field strength during communication between the radio slave device and the radio master device. The wireless slave device and the wireless master device transmit measured electric field intensity measurement data (maximum value, minimum value, and average value of electric field intensity) to the monitoring center. Based on the received field strength measurement data, the monitoring center determines whether or not the installation positions of the wireless slave device and the wireless master device are appropriate from the viewpoint of field strength. As a result of the above configuration, the automatic meter reading system of Patent Document 3 facilitates determination of whether or not the installation position of the wireless slave unit is appropriate from the viewpoint of electric field strength.

JP 2010-245997 A JP 2004-341648 A JP-A-2002-152853

As described above in relation to Patent Document 1, the received strength of radio waves varies depending on the orientation of the antenna. However, in the techniques of Patent Documents 2 and 3, in order to change the direction of the antenna and measure the reception characteristics of radio waves, it is necessary to open and close the closed space each time the direction of the antenna (or wireless communication device) is changed. Therefore, there is a problem that the measurement of the radio wave reception characteristics must be repeated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to make it possible to easily measure the radio wave reception characteristics of a wireless communication device in a closed space, including the influence of the direction of the antenna of the wireless communication device. The main purpose is

In one aspect of the present invention, the radio wave measurement system is installed outside a closed space that can be closed, and receives radio waves into the closed space by wireless communication using radio waves in a predetermined frequency band. a second wireless communication device that transmits a measurement instruction that instructs measurement of characteristics;
A first having an antenna group including three antennas installed inside a closed space and extending a three-dimensional space, and first control means for measuring reception characteristics using each of the antenna group when a measurement instruction is received. and a wireless communication device.

In one aspect of the present invention, the radio wave measuring device can be installed inside a closed space that can be closed, and includes an antenna group including three antennas spanning a three-dimensional space, and a predetermined frequency from outside the closed space. a first control means for measuring reception characteristics using each of the antenna group when receiving a measurement instruction for instructing measurement of reception characteristics of radio waves, which is transmitted by wireless communication using radio waves of the band.

In one aspect of the present invention, a radio wave measurement method is a radio wave measurement method in a radio wave measurement system including a second wireless communication device and a first wireless communication device, and is installed outside a closed space that can be closed. The second wireless communication device transmits a measurement instruction instructing the measurement of the reception characteristics of radio waves to the inside of the enclosed closed space by wireless communication using radio waves in a predetermined frequency band, and the inside of the closed space When a measurement instruction is received by a first wireless communication device having an antenna group including three antennas that are installed and span a three-dimensional space, each antenna group is used to measure reception characteristics.

In one aspect of the present invention, the radio wave measurement program can be installed inside a closed space that can be closed, and has a radio wave measurement device having an antenna group including three antennas spanning a three-dimensional space. When a measurement instruction is received from outside the closed space by wireless communication using radio waves in a predetermined frequency band and instructs to measure the reception characteristics of the radio waves, the reception characteristics are measured using each of the antenna groups. Execute the control process.

According to the present invention, it is possible to easily measure the radio wave reception characteristics of a wireless communication device in a closed space, including the influence of the direction of the antenna of the wireless communication device.

1 is a schematic diagram showing an example of the configuration of a radio wave measurement system according to a first embodiment of the present invention; FIG. 4 is a flow chart showing the operation of the radio wave measurement system according to the first embodiment of the present invention; 7 is a flow chart showing the operation of the first modified example of the radio wave measurement system according to the first embodiment of the present invention; 9 is a flow chart showing the operation of the second modified example of the radio wave measurement system according to the first embodiment of the present invention; 9 is a flow chart showing the operation of the third modified example of the radio wave measurement system according to the first embodiment of the present invention; FIG. 11 is a flow chart showing the operation of the fourth modified example of the radio wave measurement system according to the first embodiment of the present invention; FIG. FIG. 11 is a schematic diagram showing an example of the configuration of a fifth modified example of the radio wave measurement system according to the first embodiment of the present invention; FIG. 5 is a schematic diagram showing an example of the configuration of a radio wave measurement system according to a second embodiment of the present invention; 9 is a flow chart showing the operation of the radio wave measurement system according to the second embodiment of the present invention; 9 is a timing chart showing an example of the operation of the radio wave measurement system according to the second embodiment of the present invention; FIG. 11 is a schematic diagram showing an example of the configuration of a radio wave measurement system according to a third embodiment of the present invention; 1 is a block diagram showing an example of a hardware configuration capable of implementing a radio wave measuring device according to each embodiment of the present invention; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, in all the drawings, the same reference numerals are given to the same constituent elements, and the description thereof will be omitted as appropriate.
(First embodiment)
A first embodiment of the present invention will be described.

A configuration in this embodiment will be described.

FIG. 1 is a schematic diagram showing an example of the configuration of a radio wave measurement system according to the first embodiment of the present invention. FIG. 1 shows a perspective view of components in a radio measurement system. In the drawings after FIG. 1 and the following description, the directions in which the components are installed are examples, and the actual directions in which the components are installed may be arbitrary. In the drawings after FIG. 1 and the following description, when viewed from a certain direction, the width direction of the component is indicated by "X", the depth direction is indicated by "Y", and the height direction is indicated by "Z". do. That is, the X direction, Y direction, and Z direction are directions orthogonal to each other. In each of the X direction, Y direction, and Z direction, the right direction, the depth direction, and the upward direction are called the "positive side", and the left direction, the near direction, and the downward direction are called the "negative side".

A radio wave measurement system 300 in this embodiment includes a radio wave measurement device 100 (first wireless communication device) and a wireless master device 200 (second wireless communication device).

The radio wave measuring device 100 can be installed inside the closed space 400 . Radio wave measuring apparatus 100 includes antenna 130, wireless communication section 110, and control section 120 (first control means).

The closed space 400 is a space that can be opened and closed (hereinafter also referred to as “opening/closing”) by human operation, and is normally closed (except for exceptions such as maintenance). The closed space 400 can be opened and closed by a person opening and closing a door 410 of the closed space 400, for example. Alternatively, the closed space 400 can be opened and closed by, for example, attaching and detaching part of the wall material of the closed space 400 by a person. The enclosed space 400 may have gaps 420 (vents, windows, etc.). An object 430 (pipe, device, etc.) may be installed in the closed space 400 .

The number of antennas 130 may be any number of three or more. That is, the antennas 130 form an antenna group. Of the antenna group, a certain set of three antennas 130 (antennas 130x, 130y, and 130z) spans three-dimensional space. That is, the directional vectors representing the directivities of the three antennas 130 are not parallel to each other.

Wireless communication unit 110 performs wireless communication with wireless master device 200 using radio waves in a predetermined frequency band.

Upon receiving a measurement instruction through wireless communication, control section 120 measures reception characteristics using each of antennas 130 and holds the results of the measured reception characteristics. Here, the measurement instruction is an instruction to measure reception characteristics of radio waves used for wireless communication. Also, the reception characteristic is, for example, the received signal strength indicator (RSSI) or the signal to noise ratio (SNR).

Wireless master device 200 is installed outside closed space 400 . Wireless master device 200 includes a wireless communication unit 210 and a control unit 220 . Here, the name “wireless master device” is a name for convenience in the following description. That is, the radio wave measuring device 100 and the wireless master device 200 do not have to have a parent-child relationship.

The wireless communication unit 210 wirelessly communicates with the radio wave measuring device 100 .

The control unit 220 transmits a measurement instruction to the radio wave measuring device 100 installed in the enclosed closed space 400 by wireless communication.

Operations in this embodiment will be described.

FIG. 2 is a flow chart showing the operation of the radio wave measurement system according to the first embodiment of the present invention. 2 and subsequent drawings, "(A)" indicates the operation of the parent device, and "(B)", "(C)", and "(D)" indicate the operation of the child device. The flowcharts shown in and after FIG. 2 and their explanations are examples, and the order of processing, etc. may be changed, the processing may be reversed, or the processing may be repeated, as appropriate, according to the desired processing.

Before operating the radio wave measurement system 300, the closed space 400 is opened, and after installing the radio wave measurement apparatus 100 in a position and orientation for measuring the reception characteristics inside the closed space 400, the closed space 400 is closed. It is assumed that

First, the wireless master device 200 transmits a measurement instruction to the radio wave measuring device 100 (step S110).

Next, radio wave measuring apparatus 100 receives a measurement instruction from wireless master device 200 by wireless communication (step S210).

Subsequently, the radio wave measuring apparatus 100 measures reception characteristics using each of the antennas 130 (step S220). Here, since a set of at least three antennas 130 out of the antennas 130 spans a three-dimensional space, any antenna 130 has a non-zero reception characteristic or an effective reception characteristic unless the electric field strength of the radio wave is zero. can be measured.

Subsequently, the radio wave measuring apparatus 100 holds the measurement results of the reception characteristics (step S230). Here, the user acquires the held measurement result from the radio wave measuring apparatus 100 by some method (LED (Light Emitting Diode), display, memory, file, output to a communication line, etc.). However, if humans can sequentially observe the measurement results of the reception characteristics output by the radio wave measuring apparatus 100, the process of step S230 can be replaced with the process of "outputting the measurement results of the reception characteristics". For example, if the measurement results of the reception characteristics are sequentially output to a display or the like, and the output can be observed from the outside of the closed space 400, the process of step S230 can be replaced with the process of "outputting the measurement results of the reception characteristics". is. Alternatively, for example, if the measurement results of the reception characteristics are sequentially output to the wireless master device 200 or the like, and the measurement results can be observed or obtained from the wireless master device 200 or the like, the processing in step S230 is the “measurement results of the reception characteristics. output" process.

As described above, in the radio wave measurement system 300 of the present embodiment, after the radio wave measurement device 100 is installed in the closed space 400, when receiving a measurement instruction from the radio master device 200 by wireless communication, the radio wave measurement device 100 uses each of the antennas 130. Measures the reception characteristics and stores the measurement results. That is, when the radio wave measuring apparatus 100 is installed and the radio wave reception characteristics are measured, the closed space 400 needs to be opened and closed only once. On the other hand, in the techniques described in Patent Documents 2 and 3, it is necessary to open and close the closed space each time the orientation of the slave or the orientation of the antenna of the slave is changed in the closed space. Therefore, in the radio wave measurement system 300 of the present embodiment, the reception characteristics of radio waves by the radio wave measurement device 100 (wireless communication device) in the closed space 400 are affected by the direction of the antenna 130 of the radio wave measurement device 100 (wireless communication device). There is an effect that the measurement can be easily performed by opening and closing the closed space only once.

Note that the radio wave measurement system 300 in this embodiment may include a plurality of radio wave measurement devices 100 .
(First modification)
A first modified example of this embodiment will be described. In the radio wave measurement system 300 of this modified example, the radio wave measurement device 100 determines the antenna 130 for which the best reception characteristics are measured.

FIG. 3 is a flow chart showing the operation of the first modified example of the radio wave measurement system according to the first embodiment of the present invention.

After executing the processing in step S230, the control unit 120 of this modification determines the antenna 130 for which the best reception characteristics are measured based on the held reception characteristics results (step S260). For example, the control unit 120 determines the antenna 130 for which the largest received signal strength indicator (RSSI) or signal to noise ratio (SNR) is measured. In this embodiment and the following embodiments, "excellent reception characteristics" refer to reception characteristics measured in good reception conditions such as high radio reception strength or high signal-to-noise ratio. Here, it is assumed that the user acquires information about the determined antenna 130 from the radio wave measuring apparatus 100 by some method (LED, display, memory, output to a file, etc.).

As a result of the above operation, in the radio wave measurement system 300 of the present modified example, the user can obtain from the radio wave measurement device 100 information regarding the antenna 130 for which the best reception characteristics have been measured.
(Second modification)
A second modification of this embodiment will be described. In the radio wave measurement system 300 of this modified example, the radio wave measurement device 100 determines the orientation of the antenna 130 in which the best reception characteristics are expected.

FIG. 4 is a flow chart showing the operation of the second modified example of the radio wave measurement system according to the first embodiment of the present invention.

After executing the processing in step S230, the control unit 120 of this modification determines the orientation of the antenna 130 in which the best reception characteristics are expected based on the results of the reception characteristics held (step S270). . For example, the control unit 120, based on the radio wave reception strength (RSSI) or signal-to-noise ratio (SNR) measured by a set of three antennas 130 spanning a three-dimensional space, the above-mentioned Determine the orientation of the antenna 130 . That is, the control unit 120 calculates the corresponding electric field intensity (or a value proportional to the electric field intensity) from the result of the reception characteristics measured by each antenna 130 included in the set of three antennas 130 spanning the three-dimensional space. (If necessary, linearize the logarithm, calculate the field strength by the square root of the power, etc.). Then, the direction vector of each antenna 130 is weighted and added using the electric field intensity of each antenna 130 as a weight, thereby determining the direction of the antenna 130 in which the best reception characteristics are expected. Here, it is assumed that the user acquires information about the determined orientation of the antenna 130 from the radio wave measuring apparatus 100 by some method (LED, display, memory, output to a file, etc.).

As a result of the above operation, in the radio wave measurement system 300 of the present modified example, the user can obtain from the radio wave measurement device 100 information regarding the orientation of the antenna 130, which is expected to provide the best reception characteristics. be.
(Third modification)
A third modification of this embodiment will be described. In radio wave measurement system 300 of this modification, wireless master device 200 determines antenna 130 for which the best reception characteristics have been measured.

FIG. 5 is a flow chart showing the operation of the third modified example of the radio wave measurement system according to the first embodiment of the present invention.

After executing the processing in step S230, the control unit 120 of the present modification transmits the held measurement results of the reception characteristics to the wireless master device 200 by wireless communication (step S240).

The control unit 220 of this modification receives the measurement results of the reception characteristics from the radio wave measuring device 100 by wireless communication in response to the transmitted measurement instruction (step S140).

Next, the control unit 220 of this modified example holds the received reception characteristic measurement result (step S150).

Subsequently, the control unit 220 of this modification determines the antenna 130 for which the best reception characteristics are measured based on the held measurement results of the reception characteristics (step S160). Other operations in step S160 are similar to those in step S260.

As a result of the above operation, in the radio wave measurement system 300 of the present modified example, the user can obtain from the wireless master device 200 information regarding the antenna 130 for which the best reception characteristics have been measured.

It should be noted that if it is sufficient to obtain the measurement results of the reception characteristics from the wireless master device 200, the processing of step S160 can be omitted. Here, the user acquires the measurement result of the reception characteristics using each antenna 130 from the wireless master device 200 by some method (LED, display, memory, file, output to a communication line, etc.). .

Further, when it is sufficient for a human to observe the measurement results of the reception characteristics at the wireless master device 200, the processing of step S160 can be omitted, and the processing of step S150 is "outputting the received measurement results of the reception characteristics". ” processing. For example, if the measurement results of the reception characteristics are sequentially output to a display or the like, and the output can be observed from the outside of the closed space 400, the processing in steps S150 and S160 is to output the received measurement results of the reception characteristics. ” processing.
(Fourth modification)
A fourth modified example of this embodiment will be described. In the radio wave measurement system 300 of this modified example, the wireless master device 200 determines the orientation of the antenna 130 in which the best reception characteristics are expected.

FIG. 6 is a flow chart showing the operation of the fourth modified example of the radio wave measurement system according to the first embodiment of the present invention. A difference from the third modified example will be described.

After executing the processing in step S150, the control unit 220 of the present modification determines the direction of the antenna 130 in which the best reception characteristics are expected based on the held measurement results of the reception characteristics (step S170). . Other operations in step S170 are similar to those in step S270.

As a result of the above operation, in the radio wave measurement system 300 of this modified example, the user can acquire information about the orientation of the antenna 130, which is expected to have the best reception characteristics, from the wireless master device 200. be.

It should be noted that the case where the process of step S150 or step S170 can be omitted or replaced is the same as in the third modification.
(Fifth modification)
A fifth modification of the present embodiment will be described. In the radio wave measurement system 300 of this modified example, the radio wave measurement device 100 has at least six antennas 130 .

FIG. 7 is a schematic diagram showing an example of the configuration of a fifth modified example of the radio wave measurement system according to the first embodiment of the present invention.

The radio wave measuring apparatus 100 of this modification includes, in addition to the first set of three antennas 130 (antennas 130x, 130y, and 130z) spanning a three-dimensional space, the first set of three antennas 130 spanning a three-dimensional space. 2 (antennas 131x, 131y, and 131z). Each of the second set (antennas 131x, 131y, and 131z) is parallel and non-overlapping (1/2 preferably at least one wavelength apart).

As a result of the above operation, in the radio wave measurement system 300 of this modified example, spatial diversity can be used in addition to angular diversity. Therefore, in this modified example, there is an effect that there is a high possibility that an antenna 130 with better reception characteristics can be used.
(Second embodiment)
Next, a second embodiment of the present invention based on the first embodiment of the present invention will be described. The radio wave measurement system in this embodiment includes a plurality of radio wave measurement devices.

A configuration in this embodiment will be described.

FIG. 8 is a schematic diagram showing an example of the configuration of the radio wave measurement system according to the second embodiment of the present invention.

A radio wave measurement system 301 in this embodiment includes a plurality of radio wave measurement devices 100 and a wireless master device 201 . Here, each radio wave measuring device 100 is installed at a mutually different position inside the closed space 400 . Here, it is desirable that the number of radio wave measuring devices 100 is large. For that purpose, it is desirable that the external dimensions of the radio wave measuring device 100 are smaller.

Wireless master device 201 includes a wireless communication unit 210 and a control unit 221 .

The control unit 221 transmits measurement instructions to the plurality of radio wave measurement devices 100 installed in the closed closed space 400 by wireless communication.

Other configurations in this embodiment are the same as those in the first embodiment.

Operations in this embodiment will be described.

FIG. 9 is a flow chart showing the operation of the radio wave measurement system according to the second embodiment of the present invention.

In the radio wave measurement system 301 of the present embodiment, before operating the radio wave measurement system 301, the closed space 400 is opened, and a plurality of radio wave measurement devices 100 are installed in a position and direction for measuring the internal reception characteristics. It is assumed that the closed space 400 is closed.

First, the wireless master device 201 transmits measurement instructions to the plurality of radio wave measuring devices 100 (step S111). Here, the processing of step S111 may be executed serially for each of the radio wave measuring devices 100, or may be collectively executed for a plurality of radio wave measuring devices 100 at once.

Next, each radio wave measuring device 100 receives a measurement instruction from the wireless master device 200 by wireless communication (step S210).

Subsequently, each radio wave measuring device 100 measures reception characteristics using each of the antennas 130 (step S220).

Subsequently, each radio wave measuring device 100 holds the measurement results of the reception characteristics (step S230).

Here, the processing of steps S210 to S230 may be executed in series in each radio wave measuring device 100, or may be executed in parallel.

FIG. 10 is a timing chart showing an example of the operation of the radio wave measurement system according to the second embodiment of the invention. FIG. 10 shows the operation when the wireless master device 201 sequentially and serially measures the radio wave reception characteristics of the respective antennas 130 of the n radio wave measuring devices 100 (where n is an integer equal to or greater than 2). there is

First, during a period indicated by "radio wave measuring device 1 measurement", the wireless master device 201 ("master device") transmits a reception characteristic measurement instruction to the radio wave measuring device 100 ("radio wave measuring device 1"). The measurement instruction consists of three reception characteristic measurement instructions using the three antennas 130 ("antenna 1", "antenna 2", and "antenna 3"). Radio wave measuring device 100 (“radio wave measuring device 1”) measures three reception characteristics using three antennas 130, respectively, and then transmits a response including the measurement results to wireless master device 201 (“master device”).

Similarly, during a period indicated by “radio wave measuring device j measurement” (j is an integer satisfying 2≦j≦n), wireless master device 201 (“master device”) performs radio wave measuring device 100 (“radio wave measuring device j ”) to send an instruction to measure the reception characteristics. On the other hand, radio wave measuring device 100 (“radio wave measuring device j”) measures three reception characteristics using three antennas 130, respectively, and then sends a response including the measurement results to wireless master device 201 (“master device”). to send.

Other operations in this embodiment are the same as those in the first embodiment.

As described above, in the radio wave measurement system 301 of the present embodiment, after the plurality of radio wave measurement devices 100 are installed in the closed space 400, upon receiving a measurement instruction from the radio master device 201 through wireless communication, each of the antennas 130 is turned on. to measure reception characteristics and store the measurement results. That is, when the radio wave measuring apparatus 100 is installed and the radio wave reception characteristics are measured, the closed space 400 needs to be opened and closed only once. On the other hand, in the techniques described in Patent Documents 2 and 3, it is necessary to open and close the closed space each time the orientation of the slave or the orientation of the antenna of the slave is changed in the closed space. Therefore, in the radio wave measurement system 301 of the present embodiment, the radio wave reception characteristics of each radio wave measurement device 100 (wireless communication device) in the closed space 140 can be determined in the direction of the antenna 130 of each radio wave measurement device 100 (wireless communication device). Including the influence of , there is an effect that the measurement can be easily performed (the measurements in each radio wave measuring device 100 are collected at once) by opening and closing the closed space only once.

Further, in the radio wave measurement system 301 of the present embodiment, the radio wave reception characteristics are measured in a plurality of radio wave measurement apparatuses 100 installed at different positions. That is, in the radio wave measurement system 300 of this modified example, spatial diversity can be used in addition to angular diversity. Therefore, in the radio wave measurement system 301 of the present embodiment, there is an effect that there is a high possibility that a combination of the radio wave measurement device 100 and the antenna 130 having better reception characteristics can be used.

In the radio wave measurement system 301 of this embodiment, modifications similar to the first to fifth modifications of the first embodiment may be applied.
(Third embodiment)
A third embodiment of the present invention, which is the basis of each embodiment of the present invention, will be described.

A configuration in this embodiment will be described.

FIG. 11 is a schematic diagram showing an example configuration of a radio wave measurement system according to the third embodiment of the present invention.

A radio wave measurement system 309 in this embodiment includes a radio wave measurement device 109 (first radio communication device) and a radio communication device 209 (second radio communication device).

Wireless communication device 209 is installed outside closed space 409 that can be closed.

The radio wave measuring device 109 is installed inside the closed space 409 . The radio wave measuring device 109 has an antenna group and a control section 129 (first control means).

The antenna group includes three antennas 139x, 139y, and 139z that span three-dimensional space.

Operations in this embodiment will be described.
The wireless communication device 209 transmits a measurement instruction to the inside of the closed closed space 409 by wireless communication using radio waves of a predetermined frequency band. The measurement instruction is an instruction to measure the reception characteristics of radio waves.

Upon receiving the measurement instruction, control section 129 measures reception characteristics using each of the antenna groups.

As described above, in the radio wave measurement system 309 of the present embodiment, after the radio wave measurement device 109 is installed in the closed space 409, when receiving the measurement instruction from the radio communication device 209 by radio communication, each of the antennas included in the group of antennas Antenna 139 is used to measure reception characteristics. That is, when the radio wave measuring device 109 is installed and the radio wave reception characteristics are measured, the closed space 409 needs to be opened and closed only once. On the other hand, in the techniques described in Patent Documents 2 and 3, it is necessary to open and close the closed space each time the orientation of the slave or the orientation of the antenna of the slave is changed in the closed space. Therefore, in the radio wave measurement system 309 of the present embodiment, the radio wave reception characteristics of the radio wave measurement device 109 (wireless communication device) in the closed space 409 are affected by the direction of the antenna 130 of the radio wave measurement device 109 (wireless communication device). There is an effect that the measurement can be easily performed by opening and closing the closed space only once.

FIG. 12 is a block diagram showing an example of a hardware configuration that can implement the radio wave measuring device according to each embodiment of the present invention.

A radio wave measuring device 901 includes a storage device 902 , a CPU (Central Processing Unit) 903 , a keyboard 904 , a monitor 905 , an antenna selector 908 and an RF (Radio Frequency) circuit 909 . It is connected. Storage device 902 stores an operation program for CPU 903 of control unit 120 . A CPU 903 controls the radio wave measuring apparatus 901 as a whole, executes an operation program stored in a storage device 902 , executes a program of the control section 120 and transmits/receives data by means of an antenna selector 908 and an RF circuit 909 . The internal configuration of the radio wave measuring device 901 described above is an example. The radio wave measuring device 901 may have a configuration in which a keyboard 904 and a monitor 905 are connected as required.

The radio wave measurement device 901 in each of the embodiments of the present invention described above may be realized by a dedicated device. (information processing device). In this case, the computer reads the software program stored in the storage device 902 to the CPU 903 and executes the read software program in the CPU 903 . In each of the above-described embodiments, the software program includes a description capable of realizing the functions of the control units 120, 129, etc. shown in FIGS. 1, 8, and 11. It is good if there is However, it is assumed that each of these units includes appropriate hardware. In such a case, such a software program (computer program) can be regarded as constituting the present invention. Furthermore, a computer-readable storage medium storing such a software program can also be regarded as constituting the present invention.

As above, the present invention has been exemplified by each of the above-described embodiments and modifications thereof. However, the technical scope of the present invention is not limited to the scope described in each of the above-described embodiments and modifications thereof. It is obvious to those skilled in the art that various modifications or improvements can be made to such embodiments. In such cases, new embodiments with such changes or improvements may also be included in the technical scope of the present invention. And this is clear from the matters described in the claims.

Some or all of the above-described embodiments can also be described in the following supplementary remarks, but are not limited to the following.
(Appendix 1)
It is installed outside a closed space that can be closed, and transmits a measurement instruction instructing the inside of the closed closed space to measure the reception characteristics of the radio wave by wireless communication using radio waves in a predetermined frequency band. a second wireless communication device to
An antenna group including three antennas installed inside the closed space and spanning a three-dimensional space; and first control means for measuring the reception characteristics using each of the antenna group when the measurement instruction is received. A radio wave measurement system comprising a first wireless communication device having
(Appendix 2)
The radio wave measurement system according to supplementary note 1, wherein the first control means determines the antenna for which the best reception characteristic is measured based on the measurement result of the reception characteristic.
(Appendix 3)
The radio wave measurement system according to supplementary note 1, wherein the first control means determines an orientation of the antenna in which the best reception characteristics are expected based on the measurement result of the reception characteristics.
(Appendix 4)
The first control means transmits the measurement result of the reception characteristics to the second wireless communication device through the wireless communication,
The second radio communication device receives the measurement result of the reception characteristics from the first radio communication device through the radio communication in response to the transmitted measurement instruction, and outputs the received measurement result of the reception characteristics. 2. The radio wave measurement system according to 1.
(Appendix 5)
5. The radio wave measurement system according to appendix 4, wherein the second wireless communication device outputs information about the antenna for which the best reception characteristic is measured, based on the held measurement result of the reception characteristic.
(Appendix 6)
5. The radio wave measurement system according to appendix 4, wherein the second wireless communication device outputs information regarding the orientation of the antenna in which the best reception characteristics are expected, based on the held measurement results of the reception characteristics.
(Appendix 7)
7. The radio wave measurement system according to any one of appendices 1 to 6, wherein the second wireless communication device transmits the measurement instruction to the plurality of first wireless communication devices through the wireless communication.
(Appendix 8)
Any one of the antenna and the plurality of first wireless communication devices for which the best reception characteristics are measured based on the measurement results of the reception characteristics received from the plurality of first wireless communication devices 7. The radio wave measurement system according to appendix 7, which outputs information about the combination with the platform.
(Appendix 9)
Based on the measurement results of the reception characteristics received from the plurality of first wireless communication devices, which of the antenna orientation and the plurality of first wireless communication devices is expected to provide the best reception characteristics. 7. The radio wave measurement system according to appendix 7, which outputs information about a pair with one.
(Appendix 10)
10. The antenna group according to any one of Appendices 1 to 9, wherein each of the three antennas spans the three-dimensional space, and each of the three antennas is parallel to a different one of the antennas and does not overlap each other. Radio measurement system as described.
(Appendix 11)
11. The radio wave measurement system according to any one of Appendices 1 to 10, wherein the reception characteristic is a received signal strength indicator (RSSI) or a signal to noise ratio (SNR).
(Appendix 12)
It can be installed inside a closed space that can be closed,
an antenna group including three antennas spanning a three-dimensional space;
When a measurement instruction is received from outside the closed space by wireless communication using radio waves in a predetermined frequency band and instructs to measure the reception characteristics of the radio waves, the reception characteristics are measured using each of the antenna groups. and a first control means for measuring.
(Appendix 13)
13. The radio wave measuring apparatus according to supplementary note 12, wherein the first control means determines the antenna for which the best reception characteristic is measured based on the measurement result of the reception characteristic.
(Appendix 14)
A radio wave measurement method in a radio wave measurement system comprising a second radio communication device and a first radio communication device,
By the second wireless communication device installed outside the closed space that can be closed, by wireless communication using radio waves in a predetermined frequency band, the reception characteristics of the radio waves are transmitted to the inside of the closed space. Send a measurement instruction to instruct the measurement,
When the measurement instruction is received by the first wireless communication device having an antenna group including three antennas installed inside the closed space and spanning a three-dimensional space, the reception characteristics are obtained using each of the antenna group. A radio wave measurement method that measures
(Appendix 15)
A computer provided in a radio wave measuring device that can be installed inside a closed space that can be closed and has an antenna group including three antennas spanning a three-dimensional space,
When a measurement instruction is received from outside the closed space by wireless communication using radio waves in a predetermined frequency band and instructs to measure the reception characteristics of the radio waves, the reception characteristics are measured using each of the antenna groups. A radio wave measurement program for executing a first control process for measurement.

INDUSTRIAL APPLICABILITY The present invention can be used for supporting determination of the installation position of a wireless communication device, including the direction of an antenna, inside a closed space such as a pipe space or a metal housing.

100, 109 Radio wave measuring device 110 Wireless communication unit 120, 129 Control unit 130, 130x, 130y, 130z Antenna 131, 131x, 131y, 131z Antenna 139, 139x, 139y, 139z Antenna 200, 201 Wireless master device 209 Wireless communication device 210 Radio communication section 220, 221 Control section 300, 301, 309 Radio wave measurement system 400, 409 Closed space 410 Door 420 Gap 430 Object 901 Radio wave measurement device 902 Storage device 903 CPU
904 keyboard 905 monitor 906 antenna 907 internal bus 908 antenna selector 909 RF circuit

Claims (10)

It is installed outside a closed space that can be closed, and transmits a measurement instruction instructing the inside of the closed closed space to measure the reception characteristics of the radio wave by wireless communication using radio waves in a predetermined frequency band. a second wireless communication device to
An antenna group including three antennas installed inside the closed space and spanning a three-dimensional space; and first control means for measuring the reception characteristics using each of the antenna group when the measurement instruction is received. and a first wireless communication device having
The antenna group includes three further antennas, each of which is parallel to and does not overlap with each different one of the three antennas spanning the three-dimensional space,
Radio wave measurement system. 2. The radio wave measurement system according to claim 1, wherein said first control means determines said antenna for which said reception characteristics are measured to be the best, based on said measurement results of said reception characteristics. 2. The radio wave measurement system according to claim 1, wherein said first control means determines the direction of said antenna in which said best reception characteristic is expected based on said measurement result of said reception characteristic. The first control means transmits the measurement result of the reception characteristics to the second wireless communication device through the wireless communication,
The second radio communication device receives the measurement result of the reception characteristics from the first radio communication device through the radio communication in response to the transmitted measurement instruction, and outputs the received measurement result of the reception characteristics. Item 1. The radio wave measurement system according to item 1. 5. The radio wave measurement system according to claim 4, wherein the second wireless communication device outputs information regarding the antenna for which the best reception characteristic is measured, based on the measurement result of the reception characteristic held. 5. The radio wave measurement system according to claim 4, wherein the second wireless communication device outputs information regarding the orientation of the antenna in which the best reception characteristics are expected, based on the held measurement results of the reception characteristics. . It can be installed inside a closed space that can be closed,
an antenna group including three antennas spanning a three-dimensional space;
When a measurement instruction is received from outside the closed space by wireless communication using radio waves in a predetermined frequency band and instructs to measure the reception characteristics of the radio waves, the reception characteristics are measured using each of the antenna groups. and a first control means for measuring ,
The antenna group includes three further antennas, each of which is parallel to and does not overlap with each different one of the three antennas spanning the three-dimensional space,
Radio wave measuring device. 8. The radio wave measuring apparatus according to claim 7, wherein the first control means determines the antenna for which the best reception characteristic is measured based on the measurement result of the reception characteristic. A radio wave measurement method in a radio wave measurement system comprising a second radio communication device and a first radio communication device,
By the second wireless communication device installed outside the closed space that can be closed, by wireless communication using radio waves in a predetermined frequency band, the reception characteristics of the radio waves are transmitted to the inside of the closed space. Send a measurement instruction to instruct the measurement,
When the measurement instruction is received by the first wireless communication device having an antenna group including three antennas installed inside the closed space and spanning a three-dimensional space, the reception characteristics are obtained using each of the antenna group. to measure
The antenna group includes three further antennas, each of which is parallel to and does not overlap with each different one of the three antennas spanning the three-dimensional space,
Radio wave measurement method. A computer provided in a radio wave measuring device that can be installed inside a closed space that can be closed and has an antenna group including three antennas spanning a three-dimensional space,
When a measurement instruction is received from outside the closed space by wireless communication using radio waves in a predetermined frequency band and instructs to measure the reception characteristics of the radio waves, the reception characteristics are measured using each of the antenna groups. Execute the first control process to measure ,
The antenna group includes three further antennas, each of which is parallel to and does not overlap with each different one of the three antennas spanning the three-dimensional space,
Radio wave measurement program.

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