JP6973061B2 - Radio wave usage status output device, radio wave usage status output method and radio wave usage status output program - Google Patents

Description

The present invention relates to a radio wave usage status output device, a radio wave usage status output method, and a radio wave usage status output program.

With the spread of smartphones and tablet terminals, and the expansion of the use of video services, video calls, IoT (Internet of Things) services, etc., it is expected that the use of systems that communicate using unlicensed bands (unlicensed frequency bands) will increase. It has been. The unlicensed band is a frequency band (2.4 GHz band or the like) that does not require a radio station license, and is a frequency band used in a wireless LAN (Local Area Network), Bluetooth (registered trademark), or the like. Further, by using the frequency band of the unlicensed band, it is possible to make the user share the frequency resource in the situation where the management entity does not exist.

Conventionally, a technique for detecting an empty frequency using a mobile terminal is known (see, for example, Patent Document 1 and the like).

Japanese Unexamined Patent Publication No. 2009-200773

There is a request to confirm the range of devices (sensors, etc.) that use radio waves in each frequency band. However, in the method using the mobile terminal as described above, since the mobile terminal stays in one place for a short time, it is difficult to statistically determine the range in which the device using the radio wave of each frequency band exists.

In one aspect, the present invention provides a radio wave usage status output device, a radio wave usage status output method, and a radio wave usage status output program capable of outputting an area in which a device using radio waves in each frequency band exists. With the goal.

In one embodiment, the radio wave usage status output device includes an acquisition unit that acquires the reception intensity of radio waves in each frequency band of the detection target received by the receiving device fixed outdoors and the position information of the receiving device. An estimation unit that estimates the range in which a device using the radio wave of each frequency band exists based on the reception device based on the reception intensity of the radio wave of each frequency band received by the receiving device within a predetermined time. It also includes an output unit that outputs information on an area specified based on the estimation result of the estimation unit and the position information of the receiving device.

It is possible to output the area where the device using the radio wave of each frequency band exists.

It is a figure which shows roughly the structure of the radio wave usage condition confirmation system which concerns on one Embodiment. FIG. 2A is a diagram showing a hardware configuration of a receiving device, and FIG. 2B is a diagram showing a hardware configuration of a processing device. It is a functional block diagram of a receiving device and a processing device. It is a figure which shows an example of the data structure of the acquisition information DB. It is a flowchart which shows the processing of a receiving device. 6 (a) and 6 (b) are diagrams for explaining the process of FIG. It is a flowchart which shows the processing of a processing apparatus. 8 (a) and 8 (b) are diagrams (No. 1) for explaining the processing of the analysis unit. It is a figure (the 2) for demonstrating the processing of an analysis part. It is a figure which shows an example of the information which an output part outputs. 11 (a) and 11 (b) are diagrams showing another example of the information output by the output unit. 12 (a) and 12 (b) are diagrams for explaining the modified example 1. It is a figure for demonstrating the modification 3.

Hereinafter, one embodiment will be described in detail with reference to FIGS. 1 to 11.

FIG. 1 schematically shows the configuration of the radio wave usage status confirmation system 100. As shown in FIG. 1, the radio wave usage status confirmation system 100 acquires a plurality of street light poles 10 fixed outdoors and data acquired by the street light pole 10, and processes the acquired data. Radio wave usage status output. A processing device 70 as a device is provided. The street light pole 10 and the processing device 70 are connected to a network 80 such as the Internet. However, the present invention is not limited to this, and for example, the processing device 70 may be a portable information processing device such as a notebook PC (Personal Computer), and the processing device 70 and the street light pole 10 may be connected via a cable or the like. .. In the state of being connected in this way, the data accumulated by the street light pole 10 may be transmitted to the processing device 70.

The street light pole 10 is erected outdoors (for example, on the shoulder of a road) and has a street light that illuminates the surroundings at night. Further, the street light pole 10 holds various devices (for example, a radio) inside. Further, the street light pole 10 has a receiving device 40 (see FIG. 2A) for detecting the radio wave usage status in the vicinity.

Here, FIG. 2A shows the hardware configuration of the receiving device 40 included in the street light pole 10. As shown in FIG. 2A, the receiving device 40 includes a CPU (Central Processing Unit) 90, a ROM (Read Only Memory) 92, a RAM (Random Access Memory) 94, and a storage unit (for example, an HDD (Hard Disk Drive)). It includes 96, a network interface 97, a radio wave measuring device 93, a position detecting device 95 as a position measuring unit, and the like. Each component of the receiving device 40 is connected to the bus 98.

The radio wave measuring device 93 has an antenna and is a device such as a sensor that performs communication using an unlicensed band (license-free frequency band) such as a 920 MHz band, a 2.4 GHz band, and a 5 GHz band (hereinafter, “sensor”). The radio wave emitted from (called) is received, and the received power of each frequency band is measured as the reception intensity of each frequency band. The antenna of the radio wave measuring device 93 is an omni-antenna (omnidirectional antenna), and can receive radio waves emitted from a sensor existing at 360 ° around the street light pole 10. As the reception intensity of each frequency band, the reception voltage of each frequency band may be measured.

As a method for measuring the received power in each frequency band by the radio wave measuring device 93, various methods can be used. For example, a matching filter, which is an existing technique, can be used. Further, for example, a method of simultaneously analyzing a plurality of frequency bands by estimating the frequency and time in which the signal exists by spectrogram analysis and estimating the radio standard of the signal by mutual correlation calculation with the preamble reference signal (for example,). Akihiro Wada, 3 outsiders, "Method of separating superimposed signals for visualization of radio wave environment" 2016, General Incorporated Association Electronic Information and Communication Society) can also be used.

The position detecting device 95 is a storage unit that stores position information measured when the street light pole 10 is installed or when the receiving device 40 is installed on the street light pole 10, and is a position set by, for example, an operator. Information is received and stored via a general-purpose interface. The position information set by the builder may be the coordinates represented by the latitude and longitude specified based on the design document, or the coordinates represented by the latitude and longitude detected by the positioning device held by the builder. There may be. Further, the information to be stored is not limited to the coordinates represented by latitude and longitude. For example, a correspondence relationship between the coordinates corresponding to the map information used in the processing device 70 and the identification information for identifying the street light pole 10 that can be converted to the coordinates is prepared in the processing device 70, and the street light pole 10 is prepared. The identification information that identifies the device may be stored. Further, the position detection device 95 may be a GPS (Global Positioning System) and has an antenna for receiving a GPS signal. The position detection device 95 receives, for example, a radio wave in the 1.2 GHz band from an artificial satellite, and detects the position of the street light pole 10. The position detecting device 95 may repeatedly detect a position by GPS and store a plurality of detected centers of gravity of latitude and longitude in a storage unit. If the GPS positioning error is sufficiently small and can be ignored compared to the average error of the distance estimated from the installation interval of the street light pole 10 and the received power of the sensor, use a storage unit that stores the position. It does not have to be. For example, the position may be detected using GPS at the timing of transmitting the measurement result by the radio wave measuring device 93. In that case, it is not necessary to set the position at the time of installing the receiving device 40, the installation work can be simplified, or the setting error at the time of installation can be prevented.

The CPU 90 functions as a radio wave usage status acquisition unit 12, a position information acquisition unit 14, and a transmission unit 16 shown in FIG. 3 by executing a program stored in the ROM 92 or the storage unit 96.

The radio wave usage status acquisition unit 12 issues an instruction to the radio wave measuring device 93 at predetermined time intervals (for example, every hour) to cause the radio wave measuring device 93 to measure the received power of each frequency band to be detected, and the radio wave measuring device 93. Get the measurement result from. The radio wave usage status acquisition unit 12 passes the acquired received power data to the transmission unit 16. The received power data also includes information on the measured time.

The position information acquisition unit 14 acquires information on the position detected by the position detection device 95 in response to an instruction from the transmission unit 16, and passes the acquired position information to the transmission unit 16.

The transmission unit 16 issues a position information acquisition instruction to the position information acquisition unit 14 at a predetermined timing, and the position information received from the position information acquisition unit 14 and the received power acquired by the radio wave usage status acquisition unit 12. And the information of is transmitted to the processing device 70.

Returning to FIG. 1, the processing device 70 is a PC, a server, or the like, and has a hardware configuration as shown in FIG. 2 (b). As shown in FIG. 2B, the processing device 70 includes a CPU 190, a ROM 192, a RAM 194, a storage unit (here, an HDD) 196, a network interface 197, a portable storage medium drive 199, a display unit 193, and an input unit 195. Etc. are provided. The display unit 193 includes a liquid crystal display and the like, and the input unit 195 includes a keyboard, a mouse, a touch panel and the like. Each component of these processing devices 70 is connected to the bus 198. In the processing device 70, a program stored in the ROM 192 or the HDD 196 (including a radio wave usage status confirmation program) or a program read from the portable storage medium 191 by the portable storage medium drive 199 (including a radio wave usage status confirmation program). ) Is executed by the CPU 190, thereby realizing the functions of the receiving unit 72 as the acquisition unit, the analysis unit 76 as the estimation unit, and the output unit 78 as shown in FIG. Note that FIG. 3 also shows an acquisition information DB (database) 74 stored in the HDD 196 or the like of the processing device 70.

The receiving unit 72 receives the information (information on the received power of each frequency band and the position information of the street light pole 10) transmitted from the transmitting unit 16 of the receiving device 40 at a predetermined timing, and stores the information in the acquisition information DB 74. do.

Here, in the acquired information DB 74, the position information of the street light pole 10 and the received power of each frequency band measured by the receiving device 40 included in the street light pole 10 are stored together with the measured time information. ..

Based on the information stored in the acquired information DB 74, the analysis unit 76 estimates in what range the sensors that emit radio waves in each frequency band exist, and in which positions they are concentrated. The details of the specific processing of the analysis unit 76 will be described later. The processing result by the analysis unit 76 is passed to the output unit 78.

The output unit 78 outputs the processing result of the analysis unit 76 (displayed on the display unit 193). The details of the information output by the output unit 78 will be described later.

(Regarding the processing of the receiving device 40 and the processing device 70)
Next, the processing of the receiving device 40 and the processing device 70 will be described with reference to other drawings as appropriate with reference to the flowcharts of FIGS. 5 and 7.

(Processing of receiving device 40)
FIG. 5 is a flowchart showing the processing of the receiving device 40. In the process of FIG. 5, first, in step S10, the radio wave usage status acquisition unit 12 determines whether or not the time is predetermined. In this case, the radio wave usage status acquisition unit 12 determines whether or not the time is a predetermined time (for example, a time every hour). If the determination in step S10 is affirmed, the process proceeds to step S12, but if it is denied, the determination in step S10 is repeated.

When the determination in step S10 is affirmed and the process proceeds to step S12, the radio wave usage status acquisition unit 12 issues an instruction to the radio wave measuring device 93, causes the radio wave measuring device 93 to measure the received power for each frequency band, and obtains the measurement result. get. Here, as shown in FIG. 6A, various sensors (sensors 1 to 3 in FIG. 6A) exist around the street light pole 10, and each sensor and the street light pole are present. The distance from 10 varies. In the present embodiment, the received power for each frequency band (each sensor) is measured by using a method using a matching filter as described above, a method of simultaneously analyzing a plurality of frequency bands, and the like. Note that FIG. 6B is a diagram showing an example of the received power of each of the sensors 1 to 3. Here, when a plurality of sensors using the same frequency band exist in the vicinity of the street light pole 10, multiplexing is performed by time division or the like in order to prevent interference during communication. Therefore, the radio wave measuring device 93 separately measures the received power of the radio waves from a plurality of sensors using the same frequency band by performing the measurement according to the multiplexing method. The radio wave usage status acquisition unit 12 passes the acquired measurement result to the transmission unit 16. The transmission unit 16 stores the information received from the radio wave usage status acquisition unit 12 in a storage area (not shown).

Next, the transmission unit 16 determines in step S14 of FIG. 5 whether or not the transmission timing has come. The transmission timing is assumed to be, for example, once a day at a predetermined time at midnight. If the determination in step S14 is denied, the process returns to step S10, but if the determination is affirmed, the process proceeds to step S16.

When the process proceeds to step S16, the transmission unit 16 issues an instruction to the position information acquisition unit 14 and causes the position information acquisition unit 14 to acquire the position information of the street light pole 10. Then, the transmission unit 16 transmits the position information received from the position information acquisition unit 14 and the measurement result of the received power stored in the storage area to the processing device 70. After the process of step S16 is completed, the process returns to step S10 and the above process is repeatedly executed.

As described above, by repeatedly executing the process of FIG. 5, the receiving device 40 measures the received power of each frequency band at predetermined time intervals, and the measured received power is transmitted to the processing device 70 at each transmission timing. Can be sent.

(Processing of the processing device 70)
Next, the processing of the processing apparatus 70 will be described in detail with reference to other drawings according to the flowchart of FIG. 7.

When the process of FIG. 7 is started, the receiving unit 72 first determines in step S20 whether or not the information has been received from the receiving device 40. If the determination in step S20 is affirmed, the process proceeds to step S22, and the receiving unit 72 stores the received information in the acquisition information DB 74. The acquired information DB 74 stores the received power of each frequency band at each time acquired at each position (each street light pole 10) (see FIG. 4). After step S22, the process proceeds to step S24. On the other hand, if the determination in step S20 is denied, the process proceeds to step S24 without going through step S22.

When the process proceeds to step S24, the receiving unit 72 determines whether or not the processing timing has arrived. Here, the receiving unit 72 determines that the processing timing has arrived when the predetermined time arrives or when the user inputs a processing start instruction via the input unit 195. If the determination in step S24 is denied, the process returns to step S20, but if the determination is affirmed, the process proceeds to step S26.

When the process proceeds to step S26, the analysis unit 76 executes the process based on the information stored in the acquired information DB 74. Specifically, the analysis unit 76 executes the following processing.

First, the analysis unit 76 focuses on one frequency band of one street light pole 10. Here, it is assumed that the frequency bands of a certain street light pole 10 and the sensor 2 are focused on. Then, the analysis unit 76 creates a histogram of the received power obtained within a certain period (for example, one month) with respect to the frequency band of the sensor 2 of interest. For example, as shown in FIGS. 8A and 8B, the analysis unit 76 plots the number of occurrences of each received power on a graph in which the horizontal axis is the received power and the vertical axis is the number of occurrences.

Next, the analysis unit 76 identifies the median value of the received power based on the graphs of FIGS. 8A and 8B. That is, the analysis unit 76 identifies the value located at the center when the data of the number of occurrences is arranged in ascending order (or in descending order). Next, the analysis unit 76 identifies the value of the received power corresponding to the median number of occurrences, and from the specified received power, the range in which the sensor using the frequency band of interest exists (street light pole 10). (Distance from) R is estimated, and the position (distance from the street light pole 10) R'where the sensors using the frequency band of interest are concentrated is estimated. In addition, R'is defined as the radius of a circle having an area of 1/2 of the circle of radius R. That is, R'is R'= (1/2) ^1/2 × R≈0.707 × R.

In this case, the output power from each sensor is almost fixed, and as an example, it is set to 1 [mW] (= 0 [dBm]). At this time, if the received power corresponding to the median number of occurrences is −100 [dBm], the propagation loss is 100 [dB]. Therefore, assuming that the radio wave has a free space propagation loss, the propagation loss equation is expressed by the following equation (1).
Propagation loss = 92.5 + 20 × log (frequency [GHz]) + 20 × log (distance [Km])… (1)

In the case of the above example, assuming that the frequency of the sensor 2 is 5 [GHz], the above equation (1) is
100 = 106.5 + 20 × log (R')
= 106.5 + 20 × log (0.707 × R)
Because it becomes
R≈0.67 [km].

From the above, it is estimated that the sensor 2 exists within the range of R (≈0.67 km) from the street light pole 10 (see the broken line circle in FIG. 9). Further, it is estimated that the location where the sensors 2 are concentrated is located at a position of about 0.47 km (= 0.707 × 0.67) from the street light pole 10 (see the solid line circle in FIG. 9).

The analysis unit 76 pays attention to all the street light poles 10 and all frequency bands (all sensors), executes the same processing (analysis) as described above, and passes the processing result to the output unit 78.

Returning to FIG. 7, in the next step S28, the output unit 78 outputs the processing result of the analysis unit 76. In this case, the output unit 78 may create and output map information as shown in FIG. 10, for example, based on the position information of each street light pole 10 and the analysis result of the analysis unit 76. A procedure for outputting the processing result of the analysis unit 76 in the format of the map information shown in FIG. 10 will be described. When the user inputs the area to be analyzed and the processing start instruction via the input unit 195, the output unit 78 reads out the map information of the designated area. Further, the street light pole 10 existing in the designated area is searched, and the processing result of the corresponding street light pole 10 is acquired from the processing result of the analysis unit 76. As shown in the map information of FIG. 10, the output unit 78 displays the area where the sensor 2 exists as a broken line circle on the map, and displays the area where the sensor 2 is concentrated and exists as a solid line circle. do. This allows the user to see in which area the sensor is located and where it is concentrated. In the initial stage when the street light pole 10 is installed, it is not necessary to make all the street light poles 10 function. For example, in the initial stage, the street light pole 10 may be made to function by skipping several lines, and the street light pole 10 which is not made to function may be displayed in the map information. By displaying the street light pole 10 that is not functioning, it becomes easy to recognize the number of sensors to be measured and the street light pole 10 existing in the area where the sensors are concentrated. Then, by recognizing the street light pole 10 that exists in the area where the sensors are concentrated and is not functioning, it is possible to urge the user to function the recognized street light pole 10. In this way, by selectively functioning the street light pole 10 and making it easier for the user to recognize the street light pole 10 that needs to function, it is possible to perform measurement optimized according to the number of sensors to be detected. Become. Then, by setting the radio wave usage status acquisition unit 12 of the plurality of street light poles 10 displayed in the same map information to synchronize the time for activating the radio wave measuring device 93, the measurement range is set. Enables effective measurement. In this way, by realizing a radio wave usage status output device by using a plurality of street light poles 10 that are appropriately dispersed over a certain area of the city area and are arranged at regular intervals to some extent. Efficient and effective measurement of radio wave usage is possible. Although both the solid line circle and the broken line circle are displayed in FIG. 10, the present invention is not limited to this, and either the solid line circle or the broken line circle may be displayed. Further, at the stage of displaying the map information, only the position of the street light pole 10 is displayed, and when the user selects any of the positions of the street light pole 10, the selected street light pole 10 is centered. At least one of the solid line circle and the dashed line circle may be displayed. Also, it is not necessary to completely match the map information with the specified district. For example, although the street light pole 10 is located outside the map information, there may be a case where a solid line circle or a broken line circle is superimposed within the range of the map information. In that case, the designated area may be set to a region wider than the map information by about a radius represented by a solid line circle or a broken line circle.

In addition to the display as shown in FIG. 10, the output unit 78 may perform the display as shown in FIGS. 11 (a) and 11 (b), for example. FIG. 11A is a graph showing how the radius of the concentration area of a certain sensor (radius of the solid circle in FIG. 10) around a certain street light pole 10 changes with time. By performing such a display, the user can confirm the time change of the concentrated area. Further, FIG. 11B is a graph showing the received power (received power corresponding to the average value or the median number of occurrences) of each sensor for each month in the vicinity of a certain street light pole 10. By performing such a display, the user can confirm the change in the usage status of each sensor.

As described above in detail, according to the present embodiment, in the processing device 70, the receiving unit 72 detects that the receiving unit 72 has received the radio wave measuring device 93 of the street light pole 10 (receiving device 40) fixed to the outside. The reception power of the radio wave of each target frequency band and the position information of the street light pole 10 (reception device 40) are acquired. Further, the analysis unit 76 performs a process of estimating the range in which the device (sensor) using the radio wave of each frequency band exists based on the received power of the radio wave of each frequency band received by the receiving device 40 within a predetermined time. Run. Then, the output unit 78 outputs (displays) map information for displaying the area specified based on the processing result of the analysis unit 76 and the position information of the street light pole 10. Thereby, in the present embodiment, the device (sensor) that statistically processes the received power of each frequency band measured by the receiving device 40 installed outdoors within a predetermined period and uses the radio wave of each frequency band. It is possible to specify the existence range of and display the existence area as map information. Therefore, the existing area of each device can be displayed in a state that is easy for the user to recognize.

Further, in the present embodiment, the analysis unit 76 estimates the range in which the sensors using the radio waves of each frequency band are concentrated and exist. As a result, by outputting the range in which each sensor is concentrated as map information, the user can easily grasp the range in which each sensor is concentrated.

In the above embodiment, the case where the receiving device 40 has the position detecting device 95 has been described, but the present invention is not limited to this. For example, when the receiving device 40 does not have the position detecting device 95, the transmitting unit 16 holds the position of the street light pole 10 in advance, and holds it when transmitting the received power to the processing device 70. You may also send the existing location information. Further, when the identification information and the position information of the street light pole 10 are managed in advance in the acquisition information DB 74, the identification information of the street light pole 10 is transmitted when the transmission unit 16 transmits the received power to the processing device 70. May be sent together.

In the above embodiment, the case where the analysis unit 76 of the processing device 70 performs the above-mentioned analysis processing has been described, but the present invention is not limited to this. For example, the receiving device 40 may be provided with the same function as the analysis unit 76, the analysis may be performed by the function, and the analysis unit 16 may transmit the analysis result to the processing device 70. On the contrary, the configuration of the receiving device 40 may be simplified, and the processing device 70 may be provided with the functions described by the radio wave usage status acquisition unit 12, the position information acquisition unit 14, and the transmission unit 16. In that case, the receiving device 40 has a receiving amplifier connected to the antenna and an electric / optical modulator that modulates the electric signal amplified by the receiving amplifier into an optical signal, and receives the signal received by the antenna using an optical fiber. It may be transmitted to the processing device 70.

In the above embodiment, the case where the processing device 70 displays the map information or the like has been described, but the present invention is not limited to this, and the processing device 70 only outputs (transmits) the map information or the like to another terminal. May be good. In this case, the map information or the like will be displayed on the display unit of the other terminal.

In the above embodiment, a case where the received power corresponding to the median number of times the received power is generated is specified and the radii R and R'are calculated from the above equation (1) based on the specified received power has been described. However, it is not limited to this. For example, the average value of the received power may be specified, and the radii R and R'may be calculated from the above equation (1) based on the specified received power.

(Modification 1)
In the above embodiment, the case where the radio wave measuring device 93 of the receiving device 40 has an antenna (omni-antenna: omnidirectional antenna) capable of receiving radio waves from sensors existing at a surrounding 360 ° has been described. Not limited. For example, as schematically shown in FIG. 12A, the radio wave measuring device 93 has a plurality of directional antennas 51 having a reception range within a predetermined angle range (range surrounded by a broken line) (FIG. 12A). Then, you may have three).

In this modification, for example, in the initial stage, three directional antennas 51 are regarded as one omni-antenna, and the values measured by each of the directional antennas 51 are totaled (treated as one cell). In this case, the same analysis result as that of the above embodiment can be obtained, and the same display can be performed. On the other hand, when it is desired to confirm the area where the sensors are concentrated in detail, the received power of each frequency band is measured by each of the directional antennas 51, and the area where the sensors are concentrated is specified based on the measurement result. To do so.

In this case, as shown by the thick solid line in FIG. 12B, it is possible to specify and display the concentrated area for each measurement range of each directional antenna 51.

Note that FIG. 12A shows an example in which three directional antennas 51 are provided, but the present invention is not limited to this. For example, the number of directional antennas 51 is determined based on the angle range that can be measured by each of the directional antennas 51 so that the measurement range of the directional antenna 51 can cover 360 ° around the street light pole 10. May be good. For example, in the case of the example of FIG. 12A, six directional antennas 51 may be provided at equal intervals.

(Modification 2)
In the initial stage when the street light pole 10 is installed outdoors (in the city), it is not necessary to make all the street light poles 10 function. For example, in the initial stage, the street light pole 10 is made to function by skipping one, and the number of the street light poles 10 to be made is increased according to the number of sensors to be measured and the size of the area where the sensors are concentrated. You may.

(Modification 3)
A new street light pole 10'may be installed in the vicinity of the existing street light pole 10 (see FIG. 13). In this case, when the distance d between the existing street light pole 10 and the new street light pole 10'is smaller than a predetermined value (the distance is short), the output unit 78 is located around the new street light pole 10'. The area where the sensor is concentrated may not be displayed. By doing so, it is possible to prevent the areas where the sensors are concentrated from overlapping and becoming difficult to see. In this case, only the position of the new street light pole 10'is displayed, and the area around the new street light pole 10'is displayed when the position of the new street light pole 10'is selected by the user. May be good. The distance d can be calculated from the position information of each street light pole.

Further, even when the distance d is smaller than the predetermined value, as shown in FIG. 13, the range (radius 0.707 × R1) where the sensors around the existing street light pole 10 are concentrated is the new town. It may be all included in the range (radius 0.707 × R2) where the sensors around the road light pole 10'are concentrated. In such a case, the area on the side of the existing street light pole 10 may not be displayed, but only the area on the side of the new street light pole 10'may be displayed. That is, when the following equation (2) is satisfied, the area on the side of the new street light pole 10'may be displayed.
0.707 × R2 ≧ d + 0.707 × R1… (2)

By doing so, it is possible to prevent the areas where the sensors are concentrated from overlapping and becoming difficult to see.

The above processing function can be realized by a computer. In that case, a program that describes the processing content of the function that the processing device should have is provided. By executing the program on a computer, the above processing function is realized on the computer. The program describing the processing content can be recorded on a computer-readable recording medium (however, the carrier wave is excluded).

When a program is distributed, it is sold in the form of a portable recording medium such as a DVD (Digital Versatile Disc) or a CD-ROM (Compact Disc Read Only Memory) on which the program is recorded. It is also possible to store the program in the storage device of the server computer and transfer the program from the server computer to another computer via the network.

The computer that executes the program stores, for example, the program recorded on the portable recording medium or the program transferred from the server computer in its own storage device. Then, the computer reads the program from its own storage device and executes the processing according to the program. The computer can also read the program directly from the portable recording medium and execute the processing according to the program. Further, the computer can also sequentially execute the processing according to the received program each time the program is transferred from the server computer.

The embodiments described above are examples of preferred embodiments of the present invention. However, the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention.

The following additional notes will be further disclosed with respect to the description of the above embodiments and modifications.
(Appendix 1) An acquisition unit that acquires the reception intensity of radio waves in each frequency band of the detection target received by a receiver fixed outdoors and the position information of the receiver, and
An estimation unit that estimates the range in which a device using the radio wave of each frequency band exists based on the reception intensity of the radio wave of each frequency band received by the receiving device within a predetermined time.
A radio wave usage status output device including an output unit that outputs information of an area specified based on the estimation result of the estimation unit and the position information of the receiving device.
(Appendix 2) The receiving device is connected to an antenna installed on a pole on which a street light is installed.
The output unit superimposes the information of the area on the map information and outputs it.
The description in Appendix 1 is characterized in that the information in the area uses an estimation result estimated by information acquired from a plurality of receiving devices installed on the pole located in the range represented by the map information. Radio usage status output device.
(Appendix 3) The radio wave usage status output device according to Appendix 2, wherein the timing of receiving the reception intensity of the radio wave of each frequency band to be detected is synchronized by the plurality of receiving devices.
(Supplementary Note 4) The radio wave usage status output device according to any one of Supplementary note 1 to 3, wherein the estimation unit estimates a range in which devices using radio waves in the respective frequency bands are concentrated in a predetermined range or more.
(Appendix 5) The receiving device has a position measuring unit and has a position measuring unit.
The radio wave usage status output device according to any one of Supplementary note 1 to 4, wherein the acquisition unit acquires position information measured by the position measurement unit.
(Appendix 6) The receiving device has a plurality of directional antennas having a radio wave receiving range within a predetermined angle range.
The acquisition unit acquires the reception intensity of radio waves in each of the frequency bands by the plurality of directional antennas.
The estimation unit is any one of Supplementary note 1 to 5, wherein the estimation unit estimates a range in which a device using radio waves in each of the frequency bands exists for each angle range corresponding to each of the plurality of directional antennas. Radio usage status output device described in.
(Appendix 7) Whether the output unit outputs the information of the area specified based on the estimation result of the estimation unit and the position information of the receiving device based on the distance to the adjacent receiving device. The radio wave usage status output device according to any one of Supplementary note 1 to 6, wherein the radio wave usage status output device is characterized by determining whether or not the device is used.
(Appendix 8) The reception intensity of the radio wave of each frequency band to be detected received by the receiving device fixed outdoors and the position information of the receiving device are acquired.
Based on the reception intensity of the radio wave of each frequency band received by the receiving device within a predetermined time, the range in which the device using the radio wave of each frequency band exists is estimated.
The information of the area specified based on the estimation result of the estimation process and the acquired position information of the receiving device is output.
A radio wave usage status output method characterized by a computer performing processing.
(Appendix 9) The receiving device is connected to an antenna installed on a pole on which a street light is installed.
In the output process, the information in the area is superimposed on the map information and output.
The information in the area is described in Appendix 8, wherein the estimation result estimated by the information acquired from the plurality of receiving devices installed on the pole located in the range represented by the map information is used. Radio usage status output method.
(Appendix 10) The radio wave usage status output method according to Appendix 9, wherein the timing of receiving the reception intensity of the radio wave in each frequency band to be detected is synchronized by the plurality of receiving devices.
(Supplementary Note 11) The radio wave usage status output method according to any one of Supplementary note 8 to 10, wherein the estimation process estimates a range in which devices using radio waves in the respective frequency bands are concentrated in a predetermined range or more.
(Appendix 12) The receiving device has a position measuring unit and has a position measuring unit.
The radio wave usage status output method according to any one of Supplementary note 8 to 11, wherein in the acquisition process, the position information measured by the position measuring unit is acquired.
(Appendix 13) The receiving device has a plurality of directional antennas having a radio wave receiving range within a predetermined angle range.
In the acquisition process, the reception intensity of radio waves in each of the frequency bands by the plurality of directional antennas is acquired.
The estimation process is any of the appendices 8 to 12, wherein the estimation process estimates the range in which the device using the radio wave of each frequency band exists for each angle range corresponding to each of the plurality of directional antennas. Radio usage status output method described in.
(Appendix 14) In the output process, the information of the area specified based on the estimation result of the estimated process and the position information of the receiving device is output based on the distance to the adjacent receiving device. The radio wave usage status output method according to any one of Supplementary note 8 to 13, characterized in that it is determined whether or not to perform the radio wave usage status.
(Appendix 15) The reception intensity of the radio wave of each frequency band to be detected received by the receiving device fixed outdoors and the position information of the receiving device are acquired.
Based on the reception intensity of the radio wave of each frequency band received by the receiving device within a predetermined time, the range in which the device using the radio wave of each frequency band exists is estimated.
The information of the area specified based on the estimation result of the estimation process and the acquired position information of the receiving device is output.
A radio usage status output program that allows a computer to perform processing.

40 Receiver 51 Directional antenna 70 Processing device (Radio wave usage status output device)
72 Receiver (acquisition)
76 Analysis part (estimation part)
78 Output unit 95 Position detection device (position measurement unit)

Claims (8)

An acquisition unit that acquires the reception intensity of radio waves in each frequency band of the detection target received by a receiver fixed outdoors and the position information of the receiver, and
An estimation unit that estimates the range in which a device that uses radio waves in each frequency band exists based on the receiving device based on the reception intensity of radio waves in each frequency band received within a predetermined time by the receiving device. ,
A radio wave usage status output device including an output unit that outputs information of an area specified based on the estimation result of the estimation unit and the position information of the receiving device. The receiving device is connected to an antenna installed on a pole on which a street light is installed.
The output unit superimposes the information of the area on the map information and outputs it.
The first aspect of the present invention is characterized in that the information in the area uses an estimation result estimated by information acquired from a plurality of receiving devices installed on the pole located in the range represented by the map information. Radio usage status output device. The radio wave usage status output device according to claim 2, wherein the timing of receiving the reception intensity of the radio wave in each frequency band to be detected is synchronized by the plurality of receiving devices. The radio wave usage status output device according to any one of claims 1 to 3, wherein the estimation unit estimates a range in which a device using radio waves in each frequency band concentrates more than a predetermined range. The receiving device has a position measuring unit and has a position measuring unit.
The radio wave usage status output device according to any one of claims 1 to 4, wherein the acquisition unit acquires position information measured by the position measurement unit. The receiving device has a plurality of directional antennas having a radio wave receiving range within a predetermined angle range.
The acquisition unit acquires the reception intensity of radio waves in each of the frequency bands by the plurality of directional antennas.
The claim is characterized in that the estimation unit estimates the range in which a device using radio waves in each frequency band exists with reference to the receiving device for each angle range corresponding to each of the plurality of directional antennas. Item 5. The radio wave usage status output device according to any one of Items 1 to 5. The reception intensity of the radio wave of each frequency band to be detected received by the receiving device fixed outdoors and the position information of the receiving device are acquired.
Based on the reception intensity of the radio wave of each frequency band received by the receiving device within a predetermined time, the range in which the device using the radio wave of each frequency band exists is estimated with the receiving device as a reference.
The information of the area specified based on the estimation result of the estimation process and the acquired position information of the receiving device is output.
A radio wave usage status output method characterized by a computer performing processing. The reception intensity of the radio wave of each frequency band to be detected received by the receiving device fixed outdoors and the position information of the receiving device are acquired.
Based on the reception intensity of the radio wave of each frequency band received by the receiving device within a predetermined time, the range in which the device using the radio wave of each frequency band exists is estimated with the receiving device as a reference.
The information of the area specified based on the estimation result of the estimation process and the acquired position information of the receiving device is output.
A radio usage status output program that allows a computer to perform processing.

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