Radio wave monitoring device

Abstract

This radio wave monitoring device is provided with a television receiver that can receive radio waves in the television broadcast frequency band and generates reception quality information, and a wireless communication device that is communicable in an area to be monitored and a wider area and transmits the reception quality information.　FIG. 4

Description

[Technical field]

[0001] The present technology relates to a radio wave monitoring device that is applied to, for example, television broadcast waves. [Background technology]

[0002] For example, in digital television broadcasting, the quality of the received signal varies greatly depending on the influence of terrain, buildings, weather, etc. Therefore, by installing many radio wave monitoring devices and receiving information from the radio wave monitoring devices, it becomes possible to improve the monitoring accuracy within the reception area and map the reception quality information on a map.

[0003] Conventionally, a reception monitoring system for terrestrial digital broadcasting has been proposed, as described in Patent Document 1. This system has a transmitting station that transmits digital data and a receiving station for monitoring, and processes the BER (Bit Error Rate) received at the receiving station in a data collection terminal, returns the result to the transmitting station using a modem, and switches the transmission output if an abnormality is detected.

[0004] Another proposal is made in Patent Document 2. What is described in Patent Document 2 is a means for configuring a single frequency network (SFN). SFN is a method introduced to increase frequency utilization efficiency, and is a method for transmitting from multiple transmitting stations at the same frequency, but has the constraint that the deviation between two signals within a receiving area must be within a guard interval. This is a patent for a system that configures an optimal SFN overall by using multiple transmitting stations and a receiving level monitoring device to adjust the output levels of the multiple transmitting stations based on the receiving state at the monitoring device and by providing a source identification processing means. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2001-144654 A [Patent Document 2] JP 2008-072527 A Summary of the Invention [Problem to be solved by the invention]

[0006] The modem described in Patent Document 1 is a device that transmits and receives data using wired telephone lines, so in order for the transmitting station and the receiving station to communicate, a telephone line must be laid, and the receiving station can only be installed in places where there is a telephone line. This limits the location of the receiving station. Another problem is that the radio wave monitoring terminal cannot be carried around.

[0007] This technology is a method of communication between a transmitting station and a receiving station using LPWA (Low Power Wide Area) communication. This method is wireless, has a long communication distance, and consumes low power, so communication is possible without any restrictions on the location of the receiving station. In addition, because it consumes little power, it can continue to observe at a fixed point for a long period of time using a battery, which significantly reduces monitoring costs.

[0008] Patent Document 2 is limited to a method for constructing an SFN, and does not describe what communication method should be used to exchange data between a transmitting station and a receiving station.

[0009] In contrast, this technology is not limited to the construction of SFNs, but can quickly detect network problems and reduce support costs by monitoring the network in real time using LPWA communications. Furthermore, the electric field strength reaching the receiving side changes due to changes in weather conditions such as rainfall, but by monitoring that electric field strength and dynamically changing the transmission level, it is possible to improve the quality of the broadcasting network and reduce costs by reducing power consumption.

[0010] Therefore, an object of the present technology is to provide a radio wave monitoring device that can reduce restrictions on installation locations and restrictions on continuous monitoring when monitoring radio waves. [Means for solving the problem]

[0011] The present technology includes a television receiver capable of receiving radio waves in a television broadcast frequency band and generating reception quality information; It can communicate to the monitored area and a wider area. , receiving and a wireless communication device for transmitting communication quality information. 、 In a television receiver, the operation of a circuit block that is redundant for radio wave monitoring is stopped, The AGC signal is monitored, and when the AGC signal changes by a predetermined value or more, a circuit block is started to acquire the reception quality information. It is a radio monitoring device. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a block diagram of an example of a radio wave monitoring system according to the present technology. [Diagram 2] FIG. 2 is a block diagram of another example of a radio wave monitoring system according to the present technology. [Diagram 3] FIG. 3 is a schematic diagram showing the arrangement of a number of radio wave monitoring devices in a radio wave monitoring system. [Figure 4] FIG. 4 is a block diagram of a first example of a radio wave monitoring device according to the present technology. [Diagram 5] FIG. 5 is a block diagram of a second example of a radio wave monitoring device according to the present technology. [Figure 6] FIG. 6 is a block diagram of a third example of a radio wave monitoring device according to the present technology. [Figure 7] FIG. 7 is a block diagram of a modification of the third example of the radio wave monitoring device according to the present technology. [Figure 8] FIG. 8 is a block diagram of a fourth example of a radio wave monitoring device according to the present technology. [Figure 9] FIG. 9 is a block diagram used to explain an application example of the present technology. [Figure 10] FIG. 10 is a block diagram of an example of a television receiver that can be used with the present technology. [Figure 11] FIG. 11 is a block diagram of a first example of a television receiver that is adapted to reduce power consumption. [Figure 12] FIG. 12 is a block diagram of a second example of a television receiver adapted to reduce power consumption. [Figure 13] FIG. 13 is a block diagram of a third example of a television receiver adapted to reduce power consumption. [Figure 14] FIG. 14 is a block diagram for explaining the processing of the radio wave monitoring device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The embodiments described below are preferred specific examples of the present technology, and various technically preferable limitations are attached. However, the scope of the present technology is not limited to these embodiments unless otherwise specified in the following description to limit the present technology.

[0014] 1 illustrates an example of a radio wave monitoring system that uses a radio wave monitoring device according to the present technology. Television radio waves are transmitted from a transmission antenna 2 of a transmitting station 1, and are received by a television antenna 11 of a radio wave monitoring device 100. The radio wave monitoring device 100 is equipped with a television receiver 12 and an LPWA communication device 13.

[0015] In the radio wave monitoring device 100, the quality of the received signal of the television receiver 12 is monitored, and an index (called reception quality information) indicating the reception quality is obtained. The reception quality information is obtained in real time for each reception frequency (reception channel). For example, the following can be used as the reception quality information.

[0016] The reception quality information can include RSSI (Received Signal Strength Indicator), CNR (Carrier to Noise Ratio), BER (Bit Error Rate), PER (Packet Error Rate), FER (Frame Error Rate), the number of LDPC iterations in the case of LDPC code, lock / unlock, frequency response, phase noise, delay profile, etc. In the case of multiple receiving antennas, the reception quality information may be present in each antenna. Furthermore, since the reception algorithm may differ depending on the version of the receiver's software and firmware, the reception quality information includes the version information of the receiver's software and firmware and information on whether the update was successful. The reception quality information is transmitted from the LPWA antenna 14 to the transmitting station 1. The reception quality information is received by the LPWA antenna 3 of the transmitting station 1. The LPWA antenna 3 is provided in the LPWA communication device 4. The transmitting station 1 is configured to express the received reception quality information as a map, and to take measures such as investigating the cause of poor reception quality.

[0017] The radio wave monitoring device 100 may be implemented as a mobile station (mounted on a vehicle, etc.). In this case, there may be a plurality of television antennas 11, and television radio waves can be received by composite signal processing.

[0018] When the radio wave monitoring device is a mobile station, there is an advantage that many locations can be monitored in a short period of time.

[0019] 2 illustrates another example of a radio wave monitoring system. The radio wave monitoring device 100 may transmit reception quality information to the transmitting station 1 and also to the LPWA antenna 31 (LPWA communication device 32) of the data server 30, and store the reception quality information in the database 33. In this way, the reception quality information stored in the database 33 can be easily processed and used not only by the transmitting station 1 but also by the data server 30.

[0020] This technology uses LPWA communications to monitor reception quality in real time. This method is wireless, has a long communication distance, and consumes low power, so communication is possible without placing restrictions on the location of the receiving station. In addition, because it consumes little power, it can be used for long-term observation at a fixed point using a battery, significantly reducing monitoring costs. Mobile communications are also possible. Furthermore, the electric field strength reaching the receiving side changes due to changes in weather conditions such as rainfall. By monitoring the electric field strength, it is possible to dynamically change the transmission level and transmission parameters, thereby improving the quality of the broadcasting network and reducing costs by reducing labor costs and power consumption.

[0021] As shown in FIG. 3, a radio wave monitoring system can be configured by installing many radio wave monitoring devices around a transmitting station 1. Each radio wave monitoring device can be identified by an ID. Also, as described later, mapping can be performed by receiving location information of the radio wave monitoring device. The radio wave monitoring devices shown with solid lines are radio wave monitoring devices that have transmitted reception quality information indicating the highest reception quality, the radio wave monitoring devices that are not solid lines are radio wave monitoring devices that have transmitted reception quality information with average reception quality, and the radio wave monitoring devices shown with dashed lines are radio wave monitoring devices that have transmitted reception quality information with poor reception quality. In this way, since many radio wave monitoring devices can be installed within the reception area, the monitoring accuracy is significantly improved and it is also possible to map the signal quality situation on a map. Also, since the communication range of the LPWA communication device is equal to or wider than the reception area of ​​the television broadcast, information that cannot be received by the television broadcast can be transmitted.

[0022] For example, ELTRES (registered trademark) can be used as the LPWA communication method. The specifications of this LPWA communication method in Japan are shown below. With this technology, LPWA communication methods other than ELTRES (registered trademark) can also be used. Antenna power: 20mW Communication direction: One-way communication Transmitting frequency: 923.6MHz~928.0MHz (920MHz band) Communication speed: 6.35kpbs Currently, reception quality data is sent once per minute. Time interval can be changed Long-distance communication possible (line of sight transmission performance of over 100 km) Equipped with GNSS reception function The receivable frequency range of the television receiver 12 is 42 MHz to 3300 MHz. Also, frequency division or the like is used to prevent interference between transmission signals from a plurality of radio wave monitoring devices.

[0023] A number of embodiments of the radio wave monitoring device will be described below. In the radio wave monitoring device 101 shown in Fig. 4, a television receiver 12 connected to a television antenna 11 and an LPWA communication device 13 connected to an LPWA antenna 14 are connected to a bus 16 of a control microcomputer (hereinafter referred to as a control microcomputer) 15. The control microcomputer 15 transmits and receives data between the television receiver 12 and the LPWA 13 via the bus 16, and controls the overall operation of the radio wave monitoring device 101.

[0024] Channel selection information and reception quality information obtained as a result of reception via the television antenna 11 are supplied to the control microcomputer 15, and the control microcomputer 15 transmits the reception quality information to the transmitting station or data server via the LPWA communication device 13 and the LPWA antenna 14.

[0025] The radio wave monitoring device 101 provides the following advantages. This enables real-time monitoring of broadcasting networks, allowing problems in the broadcasting network to be detected as soon as they occur. For example, it is possible to identify in real time abnormalities in the radio wave transmission / reception environment caused by natural disasters (guerilla rainstorms, typhoons, gusts of wind, etc.), as well as the time, location, and impact of illegal radio waves. In addition, it is possible to monitor fringe areas within the broadcasting area. In addition, since there is no need for people to perform the measurement work, support costs can be reduced.

[0026] The transmitting station that receives the reception quality information from the radio wave monitoring device 101 dynamically changes the transmission power and transmission parameters based on the reception quality information. For example, by changing the transmission level and transmission parameters (e.g., coding rate) according to weather conditions, it is possible to improve the quality of the broadcast network and reduce costs by reducing labor costs and power consumption. In addition, measures are taken such as temporarily increasing the transmission power at specific locations or changing to robust parameters when the radio wave transmission / reception environment is abnormal.

[0027] Reception quality information can be accessed not only by workers at the transmitting station, but also by anyone with a communication terminal such as a smartphone, who can access information from the transmitting station or data server in real time to obtain reception quality information, thereby improving the quality of the broadcast network and reducing costs.

[0028] The radio wave monitoring device 102 will be described with reference to Fig. 5. The radio wave monitoring device 102 includes a GNSS receiver 18 connected to a GNSS antenna 17. GNSS (Global Navigation Satellite System) is a general term for satellite positioning systems such as GPS, GLONASS, Galileo, Quasi-Zenith Satellite System (QZSS), BeiDou, etc. For example, the Quasi-Zenith Satellite System (Michibiki) has recently started operation, complementing GPS and enabling more accurate positioning. If the LPWA communication device 13 is equipped with a GNSS receiver, the function of the GNSS receiver is used.

[0029] Positioning information (position, height, and time information) from the GNSS receiver 18 is supplied to the control microcomputer 15 via the bus 16. The control microcomputer 15 adds the positioning information obtained from the GNSS receiver 18 to the reception quality information obtained as a result of receiving the signal via the television antenna 11, and transmits the information from the LPWA communication device 13 and the LPWA antenna 14 to the transmitting station or data server. The transmitting station or data server can associate the reception quality information with the position information. Therefore, the radio wave monitoring device 102 does not need to be installed at a fixed (predetermined) location, and dynamic monitoring can be performed. Furthermore, the transmitting station or data server can combine the position, height, and time information with the reception quality to map the reception quality on a map. The height information is very important information because radio waves are more easily received by antennas placed at higher locations.

[0030] If there are multiple antennas, the antennas may interfere with each other, which may restrict the placement. There is also a problem that the placement becomes cumbersome. In order to solve such problems, the radio wave monitoring device 103 shown in FIG. 6 is configured so that a shared antenna 19 has the functions of the television antenna 11, the LPWA antenna 14, and the GNSS antenna 17 in the radio wave monitoring device 102 described above. The output of the shared antenna 19 is supplied to a distributor and splitter 20. The distributor and splitter 20 separates the television reception signal, the LPWA reception signal, and the GNSS reception signal. The television reception signal is supplied to the television receiver 12, the LPWA reception signal is supplied to the LPWA communication device 13, and the GNSS reception signal is supplied to the GNSS receiver 18.

[0031] Furthermore, to solve the problem of battery replacement and charging of the radio wave monitoring device, a shared antenna 21 combined with a solar cell may be used as shown in Fig. 7. The shared antenna 21 is often placed in a location with good visibility, and is likely to be exposed to sunlight. This configuration can solve the problem of power supply.

[0032] Furthermore, by equipping the antenna with a device that can detect direction, such as a gyro sensor, it is possible to detect the direction of the antenna and transmit this information together with reception quality information. This makes it possible to detect whether the deterioration of reception quality is due to the change in the direction of the antenna caused by strong winds, etc., when the reception quality deteriorates, thereby improving the accuracy of radio wave monitoring.

[0033] The radio wave monitoring device 104 shown in Fig. 8 is configured to include an antenna 22 capable of receiving radio waves other than television radio waves present in the frequency range to be monitored. The output of the antenna 22 is supplied to a television receiver 23, and the television receiver 23 acquires information such as RSSI as reception quality information. That is, since the television receiver 23 can select frequencies in a wide band, it can detect not only the reception quality of digital television broadcasting, but also signals of other wireless standards by selecting a desired frequency and acquiring information such as RSSI, and therefore it can detect whether there is illegal radio waves or radio wave interference due to unnecessary radiation, etc. For example, it can be determined whether a signal is a television signal or another signal depending on whether it can be demodulated by a demodulator in the television receiver 23.

[0034] In the radio wave monitoring system described with reference to Fig. 2, reception quality information of the radio wave monitoring device 100 is transmitted to the data server 30 by LPWA communication. However, the radio wave monitoring device 100 itself may be provided with the data server 30. As shown in Fig. 9, reception quality information is transmitted to the transmitting station 1 via the data server 30 by wireless / wired communication or the like other than LPWA communication, and the transmission power and transmission parameters are dynamically changed based on the reception quality information. For example, by changing the transmission level and transmission parameters (e.g., coding rate) according to weather conditions, it is possible to improve the quality of the broadcast network and reduce costs.

[0035] Also, the reception quality information can be transmitted wirelessly or via wired communication by the fixed television receiving station 34, and the reception settings of the television receiver can be changed according to the reception conditions. An example of changing the reception settings is to remove a booster or repeater. The reception settings inside the tuner of the television receiver can also be changed. The directivity of the television antenna can also be changed. For example, based on information obtained from a radio wave monitoring device, the directivity can be strengthened in the direction in which the radio wave monitoring device detects a high RSSI. Methods for changing the directivity include physically changing the direction of the antenna, or using adaptive array technology or a reflector.

[0036] In addition, in order to improve reception quality at a mobile television receiving station, when the same content is transmitted on a different channel, it is possible to switch to a channel that is easier to receive based on quality information obtained from a radio wave monitoring device installed at a nearby location. Furthermore, by changing the parameters on the broadcasting station side, it is possible to improve the quality of the video signal, or conversely, change the parameters to make it easier to receive. Since LPWA communication supports high-speed mobile communication, a radio wave monitoring device may be installed on a mobile body. By doing so, quality information for more locations can be obtained, and it can also be used to calculate the moving speed based on the position and time information obtained by GNSS and search for reception settings that match the moving speed and location. This is because the signal received by the television receiver changes depending on the position and moving speed. In addition, in vehicle-mounted applications, multiple antennas are sometimes placed on the front, rear, left and right sides of the vehicle to perform diversity reception, and by detecting which antenna among the placed antennas has a high level, it is possible to add information such as which direction the electric field strength is strong as quality information.

[0037] In this technology, it is very important to reduce power consumption. The configuration (method) for achieving this will be described below. As shown in Fig. 10, the television receiver 12 is composed of a tuner section (or tuner IC) 40 for selecting a channel, and a digital demodulation section 50 (or demodulation IC) 50 for demodulating the digital signal carried on the channel. Power consumption can be reduced by preventing unnecessary blocks from occurring for radio wave monitoring.

[0038] In tuner unit 40, an RF signal supplied from a television antenna is amplified by variable RF amplifier / RF filter 41 and supplied to mixer 42. A local oscillation signal is supplied to mixer 42 from local oscillator 43, and is converted to an IF frequency by mixer 42. An output signal from mixer 42 is supplied to variable IF amplifier / IF filter 44, and an IF signal is extracted from variable IF amplifier / IF filter 44 and supplied to demodulation unit 50.

[0039] In the demodulation unit 50, the input IF signal is converted to a digital signal by an A / D converter 51, and then demodulated in a digital demodulation unit 52 using Orthogonal Frequency Division Multiplex (OFDM), Quadrature Amplitude Modulation (QAM), etc., and further, in an error correction unit 53, error correction processing such as Low Density Parity check Code (LDPC), Reed-Solomon (RS), etc. is performed. An output of the error correction unit 53 is supplied to a video / audio signal multiplexing unit 54, which outputs a multiplexed signal (such as a Transport Stream (TS) or Type Length Value (TLV)).

[0040] In the A / D converter 51 of the demodulation unit 50, an AGC (Automatic Gain Control) signal is formed, and the AGC signal is supplied as a gain control signal to the variable RF amplifier / RF filter 41 and the variable IF amplifier / IF filter 44 of the tuner unit 40. Furthermore, the tuner unit 40 is provided with a logic unit 45 for control and a communication unit 46. Similarly, the demodulation unit 50 is provided with a logic unit 55 for control and a communication unit 56. Data from the communication units 46 and 56 is output to the control microcomputer and the LPWA communication device.

[0041] The above-mentioned tuner unit 40 and demodulation unit 50 are configured to include circuit blocks necessary for receiving normal television broadcasting. However, in order to function as a radio wave monitoring device as in the present technology, there are circuit blocks that generate redundant signals, and in order to reduce power consumption, it is desirable to stop the operation of such circuit blocks. Note that the RSSI as reception quality information is generated in the A / D converter 51, the SNR is generated in the digital demodulation unit 52, and the BER is generated in the error correction unit 53. These pieces of reception quality information are transmitted to the control microcomputer via the logic unit 55 and the communication unit 56.

[0042] Since the radio wave monitoring device does not need to output multiplexed signals of video and audio, the video and audio signal multiplexing unit 54 is put into a stopped state as shown by the dashed line in Fig. 11. As a result, power consumption can be reduced. Note that the control signal for stopping the operation is supplied from the control microcomputer to the target circuit block, although it is not shown in the figure.

[0043] In FIG. 12, as shown by the dashed line, the digital demodulation unit 52 and the error correction unit 53 are in a stopped state in addition to the video / audio signal multiplexing unit 54. As a result, power consumption can be further reduced. Furthermore, the digital demodulation unit 52 and the error correction unit 53 may be operated only when there is a large change in the signal input to the tuner unit 40 or the demodulation unit 50 (i.e., when an abnormality occurs). For example, the digital demodulation unit 52 and the error correction unit 53 may be activated to obtain the SNR or BER value only when there is a change of a certain amount or more in the RSSI value of the demodulation unit 50. Furthermore, the AGC voltage is adjusted according to the level input to the demodulation unit 50. This AGC voltage may be monitored by a control microcomputer, and the digital demodulation unit 52 and the error correction unit 53 may be operated only when there is a change.

[0044] To further reduce power consumption, a method may be used in which the entire demodulation unit 50 is stopped and a certain level of signal level is captured only by the tuner unit 40. For example, as shown in FIG. 13, the tuner unit 40 is often provided with an overload detector 61 for reducing the gain of the amplifier when a strong input of a certain level or more is received. Therefore, the overload detector 61 is used as a simple signal level detector to monitor the detection level of the overload detector 61. Only when there is a change in the value of the detection level, the demodulation unit 50 may be woken up to obtain reception quality information such as RSSI, SNR, and BER. This configuration can reduce power consumption because only the circuit blocks required for simple monitoring need to be operated.

[0045] 13, the value of the detection level is output as digital data from logic unit 45 to control microcomputer via communication unit 46. Also, the voltage of overload detector 61 may be output from terminal 62 and input to an A / D conversion port of the control microcomputer for monitoring. In this case, the AGC voltage during demodulation is captured by A / D converter 63 and stored as digital data in memory unit 64 (or an external memory) inside tuner unit 40. When demodulation unit 50 is stopped, the voltage data stored in memory unit 64 is applied to variable RF amplifier / RF filter 41 and variable IF amplifier / IF filter 44 using D / A converter 65, thereby making it possible to operate tuner unit 40 in the same state as when demodulation is in operation.

[0046] As shown in Fig. 14, when an abnormality is detected, it is first transmitted to the control microcomputer 15 of the radio wave monitoring device 101, an abnormality signal is transmitted from the LPWA communication device 13, and then, in order to analyze the abnormality in detail, all channels are selected one by one and the contents of the abnormality are analyzed. If the control microcomputer 15 has a memory, the results can be stored in the memory 24, and the data can be immediately referenced when a maintenance worker arrives upon receiving the abnormality transmission signal.

[0047] Although the embodiments of the present technology have been specifically described above, they are not limited to the above-mentioned embodiments, and various modifications based on the technical ideas of the present technology are possible. In addition, the modification modes can be appropriately combined with one or more arbitrarily selected ones. In addition, the configurations, methods, processes, shapes, materials, and numerical values ​​of the above-mentioned embodiments can be combined with each other as long as they do not deviate from the gist of the present technology. For example, since an LPWA communication device can communicate even when moving at high speed, a radio wave monitoring device may be mounted on a moving object to continuously monitor the reception quality. [Explanation of symbols]

[0049] 1 transmitting station, 4,13 LPWA communication device, 12 Television receiver, 15 Control microcomputer, 18 GNSS receiver, 30 Data servers, 40... tuner section, 50... demodulation section, 100,101,102,103,104... Radio wave monitoring device

Claims

1. a television receiver capable of receiving radio waves in a television broadcast frequency band and generating reception quality information; a wireless communication device capable of communicating with the area to be monitored and a wider area and transmitting the reception quality information; In the television receiver, the operation of a circuit block that is redundant for radio wave monitoring is stopped, A radio wave monitoring device that monitors an AGC signal, and when the AGC signal changes by a predetermined value or more, wakes up the circuit block and acquires the reception quality information.

2. 2. The radio wave monitoring device according to claim 1, wherein said radio waves in said television broadcast frequency band include radio waves other than television signals.

3. 2. The radio wave monitoring device according to claim 1, wherein the wireless communication device is a low power wireless (LPWA) communication device.

4. 2. The radio wave monitoring device according to claim 1, wherein said wireless communication device transmits said reception quality information to a transmitting station.

5. 2. The radio wave monitoring device according to claim 1, wherein said wireless communication device transmits said reception quality information to a server and stores the information in the server.

6. 2. The radio wave monitoring device according to claim 1, further comprising a GNSS receiver, and the position and height obtained by the GNSS receiver are transmitted by the wireless communication device.

7. 2. The radio wave monitoring device according to claim 1, further comprising a GNSS receiver, wherein time information is transmitted by the GNSS receiver through the wireless communication device.

8. 2. The radio wave monitoring device of claim 1, wherein said radio wave monitoring device comprises an antenna.

9. 9. The radio wave monitoring device of claim 8, comprising a television antenna and a LPWA antenna.

10. The radio wave monitoring device according to claim 8, comprising a television antenna, a LPWA antenna and a GNSS antenna.

11. 9. The radio wave monitoring device according to claim 8, further comprising an antenna capable of being used for multiple purposes.

12. 9. The radio wave monitoring device according to claim 8, wherein the radio wave monitoring device is a combination of a solar cell and an antenna.

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