JPWO2018154772A1 - Signal detection apparatus, sampling apparatus, illegal radio monitoring system, signal source position estimation system, interference avoidance communication system, and signal waveform data collection method - Google Patents

Abstract

It is used in communication of the same frequency band among the first signals from the combination of the signal detection unit (103) that acquires the valid signal information list from a plurality of sampling devices and detects the first signal and the valid signal information list The combination of the sampling devices of the transmission source of the valid signal information list including the reception state of the second signal, and the connection information indicating the reception period of the second signal; A message for generating a signal extraction message indicating an extraction period of signal waveform data of the signal received by the sampling device based on the combination detection unit (104) to be created and the connection information, and transmitting it to the sampling device corresponding to the connection information When the transmitter (105) and the valid signal information list are received, they are output to the signal detector and the signal waveform When receiving the data comprises a message receiving unit for transmitting to the host device (102), the.

Description

  The present invention relates to a signal detection apparatus, sampling apparatus, illegal radio wave monitoring system, signal source position estimation system, interference avoidance communication system, and signal waveform data collection method used in radio wave monitoring.

  Conventionally, in the radio wave monitoring device, the radio wave sensor has removed unnecessary radio wave information and notified the host device of necessary radio wave information. The radio wave sensor determines whether or not at least one of the frequency, bandwidth, appearance time, etc. of the received signal matches a preset one, and is obtained by a preset modulation scheme, modulation speed, etc. Unnecessary radio wave information is automatically removed by determining whether the frequency distribution to be detected matches the frequency distribution of the received signal. Such a technique is disclosed in Patent Document 1.

Patent No. 3903814

  However, according to the above-mentioned prior art, it is necessary to know waveform information such as frequency, bandwidth, modulation scheme, modulation rate, or appearance time. Therefore, the radio wave sensor can not extract necessary radio wave information if all of these are unknown. The radio wave sensor notifies the higher-level device of unnecessary radio wave information as well, resulting in an increase in the amount of data to be notified to the higher-level device.

  The present invention has been made in view of the above, and it is an object of the present invention to obtain a signal detection device capable of reducing the data amount of waveform information to be notified to a host device.

  In order to solve the problems described above and to achieve the object, the signal detection device of the present invention obtains a valid signal information list indicating reception states of signals from a plurality of sampling devices, and has a defined signal strength from the signals. The combination of the first signal, which is a signal used in the communication of the same frequency band, is detected from the combination of the signal detection unit that detects the first signal and the valid signal information list; And a combination detection unit configured to create connection information indicating a reception period of the second signal and a combination of sampling devices of transmission sources of the valid signal information list including the reception states of the two signals. Further, the signal detection apparatus generates a signal extraction message indicating an extraction period of signal waveform data of the signal received by the sampling apparatus based on the connection information, and transmits the message to the sampling apparatus corresponding to the connection information And a message receiving unit that outputs the valid signal information list from the sampling device to the signal detection unit, and transmits the signal waveform data that is a response to the signal extraction message from the sampling device to the upper apparatus It is characterized by

  The signal detection device according to the present invention has the effect of being able to reduce the amount of data of waveform information to be notified to the host device.

FIG. 1 shows a configuration example of a signal detection system according to a first embodiment. Block diagram showing a configuration example of the signal detection apparatus according to the first embodiment FIG. 2 is a diagram showing an example of a hardware configuration of a signal detection apparatus according to a first embodiment. Block diagram showing a configuration example of the sampling device according to the first embodiment A figure showing an example of hardware constitutions of a sampling device concerning Embodiment 1 A flowchart showing an example of the operation of the signal detection apparatus according to the first embodiment A diagram showing an example of a connection list created by a combination detection unit of the signal detection apparatus according to the first embodiment. Flow chart showing an example of the operation of the sampling device according to the first embodiment A sequence diagram showing the relationship between the operation of the signal detection device according to the first embodiment and the operation of the sampling device A diagram showing a configuration example of an illegal radio monitoring system according to a second embodiment FIG. 16 is a diagram showing an example of the contents of the connection list created based on the valid signal information list acquired from the sampling device by the signal detection apparatus according to the second embodiment as a specific signal arrangement. FIG. 16 is a diagram showing an example of the configuration of a signal source position estimation system according to a third embodiment. A diagram showing an example of information of a valid signal information list from a sampling device when a combination detection unit of a signal detection device according to a third embodiment estimates the position of a signal source. FIG. 16 is a diagram showing an example of configuration of an interference avoiding communication system according to a fourth embodiment.

  Hereinafter, a signal detection apparatus, a sampling apparatus, an illegal radio wave monitoring system, a signal source position estimation system, an interference avoidance communication system, and a signal waveform data collection method according to the embodiment of the present invention will be described in detail based on the drawings. The present invention is not limited by the embodiment.

Embodiment 1
FIG. 1 is a diagram showing a configuration example of a signal detection system 900 according to a first embodiment of the present invention. The signal detection system 900 includes a signal detection device 100, sampling devices 200-1 to 200-6, which are radio wave sensors, and a host device 300. When the sampling devices 200-1 to 200-6 are not distinguished from one another, they may be referred to as a sampling device 200. Although six sampling devices 200 are shown in FIG. 1, this is an example, and may be more or less than six. Physical or logical unique identifiers are assigned to all devices including the signal detection device 100 and the sampling device 200. In the signal detection system 900, the signal detection apparatus 100 acquires signal waveform data from which unnecessary radio waves have been removed from each of the six sampling apparatuses 200, and transmits the acquired signal waveform data to the host apparatus 300.

  The configuration of the signal detection apparatus 100 will be described. FIG. 2 is a block diagram showing a configuration example of the signal detection apparatus 100 according to the first embodiment. The signal detection apparatus 100 includes a wireless transmission / reception unit 101, a message reception unit 102, a signal detection unit 103, a combination detection unit 104, a message transmission unit 105, and an antenna 106.

  The wireless transmission and reception unit 101 transmits and receives a wireless signal including a message to and from the sampling devices 200-1 to 200-6 via the antenna 106.

  The message reception unit 102 determines the content of the message included in the wireless signal received by the wireless transmission / reception unit 101. For example, when the message content included in the wireless signal is the valid signal information list, the message receiving unit 102 outputs the valid signal information list to the signal detection unit 103. Further, when the content of the message included in the wireless signal is signal waveform data, the message receiving unit 102 transmits the signal waveform data to the higher-level device 300.

  The signal detection unit 103 detects a fixed length signal having a defined signal strength using the valid signal information list from the sampling devices 200-1 to 200-6 acquired from the message reception unit 102. The fixed length signal is a first signal. The detailed operation of the signal detection unit 103 will be described later.

  The combination detection unit 104 detects a combination of second signals which are signals used in communication of the same frequency band among fixed length signals, from the combination of the valid signal information list. The combination detection unit 104 creates connection information indicating the combination of the sampling apparatus 200 of the transmission source of the valid signal information list including the reception state of the second signal and the reception period of the second signal. The connection information includes information of an identifier of each sampling device 200 indicating a combination of the sampling devices 200. The reception period of the second signal may include a period during which each sampling device 200 is receiving the second signal, and may be in a range larger than the actual reception period. A collection of multiple pieces of connection information is used as a connection list. The detailed operation of the combination detection unit 104 will be described later.

  The message transmission unit 105 transmits the generated message to the sampling device 200. Specifically, the message transmission unit 105 generates a message including a trigger signal instructing the sampling device 200 to start sampling, and outputs the message to the wireless transmission / reception unit 101. The wireless transmission / reception unit 101 generates a wireless signal including the trigger signal as a message content, and transmits the wireless signal via the antenna 106 to all the sampling devices 200 as a destination or by broadcast. Further, the message transmission unit 105 generates a signal extraction message indicating an extraction period of the signal waveform data of the signal received by the sampling device 200 based on the connection list, that is, each connection information, and outputs the signal extraction message to the wireless transmission / reception unit 101. The wireless transmission / reception unit 101 generates a wireless signal including a signal extraction message, and transmits a wireless signal via the antenna 106 to the sampling device 200 corresponding to the connection information, that is, the sampling device 200 corresponding to the identifier included in the signal extraction message. Send

  FIG. 3 is a diagram illustrating an example of a hardware configuration of the signal detection apparatus 100 according to the first embodiment. The signal detection apparatus 100 is realized by a processor 120, a storage 121, a memory 122, and a wireless transceiver 123. Specifically, the wireless transmission / reception unit 101 is a wireless transmission / reception device 123. The wireless transceiver 123 also includes an antenna 106.

  The message reception unit 102, the signal detection unit 103, the combination detection unit 104, and the message transmission unit 105 are realized by software, firmware, or a combination of software and firmware. The software and firmware are described as a program and stored in the memory 122. Each function is realized by the processor 120 reading and executing the program stored in the memory 122. When the information is recorded while the program is executed, the memory 122 may be used to hold data, or the storage 121 may be used to hold data. As described above, the message reception unit 102, the signal detection unit 103, the combination detection unit 104, and the message transmission unit 105 are realized by a processing circuit including the processor 120, the storage 121, and the memory 122.

  In FIG. 3, the processor 120 is, for example, a CPU (Central Processing Unit, central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, DSP (Digital Signal Processor)). The storage 121 and the memory 122 may be, for example, a random access memory (RAM), a read only memory (ROM), a flash memory, an erasable programmable read only memory (EPROM), or an EEPROM (registered trademark) (electrically erasable programmable read only memory). Non-volatile or volatile semiconductor memory, magnetic disk, flexible disk, optical disk, compact disk, mini disk, DVD (Digital Versatile Disk), etc.

  The processing circuit including the processor 120, the storage 121, and the memory 122 may be realized by dedicated hardware. When realized by dedicated hardware, the processing circuit may be, for example, a single circuit, a complex circuit, a programmed processor, a parallel programmed processor, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or It is a combination of these.

  Next, the configuration of the sampling device 200 will be described. The sampling devices 200-1 to 200-6 have the same configuration, and therefore, here, the sampling device 200-1 will be described as an example. FIG. 4 is a block diagram showing a configuration example of the sampling device 200-1 according to the first embodiment. The sampling apparatus 200-1 includes a wireless transmission / reception unit 201, a message reception unit 202, a wireless reception unit 203, a signal waveform recording unit 204, a spectrogram generation unit 205, a valid signal determination unit 206, and a message transmission unit 207. , A signal waveform extraction unit 208, and antennas 209 and 210. The antennas 209 and 210 may be separate antennas or may be one common antenna.

  The wireless transmission / reception unit 201 transmits / receives a wireless signal including a message to / from the signal detection apparatus 100 and another surrounding sampling apparatus 200 via the antenna 209.

  The message reception unit 202 determines the content of the message included in the wireless signal received by the wireless transmission / reception unit 201. For example, when the message content included in the wireless signal is a trigger signal, the message receiving unit 202 outputs a trigger signal to the wireless receiving unit 203. Also, when the message content included in the wireless signal is a connection list, the message receiving unit 202 outputs the connection list to the signal waveform extracting unit 208.

  The wireless reception unit 203 starts sampling based on an instruction from the signal detection apparatus 100, that is, a trigger signal. Specifically, the wireless reception unit 203 receives a signal transmitted and received around the own apparatus via the antenna 210, converts the signal from a radio frequency to an intermediate frequency, and further converts an analog signal to a digital signal. Processing or the like is performed, and signal waveform data, which is digital data of the waveform of the received signal, is stored in the signal waveform recording unit 204. The wireless reception unit 203 receives, for example, an illegal wireless signal transmitted and received around the own apparatus. Unlike the wireless transmitting and receiving unit 201 transmitting and receiving a specific wireless signal, the wireless receiving unit 203 receives an unspecified wireless signal.

  The signal waveform recording unit 204 stores signal waveform data of a signal received by sampling in the wireless reception unit 203.

  The spectrogram creation unit 205 creates a spectrogram in which spectrum intensities are mapped in the time direction and the frequency direction, using the signal waveform data stored in the signal waveform recording unit 204.

  The effective signal determination unit 206 removes signal components such as noise from the spectrogram generated by the spectrogram generation unit 205, and detects an effective signal that is a candidate for a signal used in communication. The valid signal determination unit 206 calculates the valid frequency band, the reception start time, the reception duration time, the reception end time, the average reception power, and the like for the detected valid signal, and creates a valid signal information list including these information. . The detailed operation of the valid signal determination unit 206 will be described later.

  The signal waveform extraction unit 208 extracts, from the signal waveform recording unit 204, signal waveform data of the extraction period instructed by the signal extraction message from the signal detection apparatus 100.

  The message transmission unit 207 transmits the generated message to the signal detection apparatus 100. Specifically, the message transmission unit 207 generates a message including the valid signal information list generated by the valid signal determination unit 206 or the signal waveform data extracted by the signal waveform extraction unit 208, and the wireless transmission / reception unit 201. Output to The wireless transmission and reception unit 201 generates a wireless signal including the valid signal information list or the signal waveform data as a message content, and transmits the wireless signal to the signal detection apparatus 100 via the antenna 209.

  FIG. 5 is a diagram illustrating an example of a hardware configuration of the sampling device 200-1 according to the first embodiment. The sampling device 200-1 is realized by a processor 220, a storage 221, a memory 222, an A / D converter 223, a wireless receiver 224, and a wireless transceiver 225. Specifically, the wireless transmission / reception unit 201 is a wireless transmission / reception device 225. The wireless transceiver 225 also includes an antenna 209. Also, the wireless reception unit 203 is an A / D converter 223 and a wireless receiver 224. The wireless receiver 224 also includes an antenna 210. The signal waveform recording unit 204 is the storage 221 or the memory 222.

  The message reception unit 202, the spectrogram generation unit 205, the valid signal determination unit 206, the message transmission unit 207, and the signal waveform extraction unit 208 are realized by software, firmware, or a combination of software and firmware. The software and firmware are written as a program and stored in the memory 222. Each function is realized by the processor 220 reading and executing the program stored in the memory 222. The holding of data necessary for the execution of the program of each function and the recording of information by the signal waveform recording unit 204 are performed using the memory 222 or the storage 221. As described above, the message reception unit 202, the spectrogram generation unit 205, the valid signal determination unit 206, the message transmission unit 207, and the signal waveform extraction unit 208 are realized by a processing circuit including the processor 220, the storage 221, and the memory 222. .

  In FIG. 5, a processor 220 is, for example, a CPU. The storage 221 and the memory 222 correspond to, for example, nonvolatile or volatile semiconductor memory such as RAM, ROM, flash memory, EPROM, EEPROM, magnetic disk, flexible disk, optical disk, compact disk, mini disk, DVD, etc. .

  The processing circuit including the processor 220, the storage 221, and the memory 222 may be realized by dedicated hardware. When implemented in dedicated hardware, the processing circuitry may be, for example, a single circuit, a complex circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof.

  Subsequently, the operation of the signal detection system 900 according to the first embodiment will be described. The signal detection apparatus 100 and the sampling apparatus 200 use the identifier assigned to each apparatus as described above when identifying the communication partner. As an identifier, for example, a known address used in a data link layer, a network layer, or another layer can be used.

  First, the operation of the signal detection apparatus 100 will be described. FIG. 6 is a flowchart showing an example of the operation of the signal detection apparatus 100 according to the first embodiment. The flowchart shown in FIG. 6 is an example, and the order of each process may be switched if necessary, or each process may be parallelized. The values and threshold values set in the signal detection apparatus 100 may be set from the higher-level device 300 or may be set in advance by the user in the signal detection apparatus 100.

  In the signal detection apparatus 100, the message transmission unit 105 generates a trigger signal for instructing the start of sampling. The trigger signal includes information on a sampling start time and a period during which the sampling apparatus 200 receives a signal, that is, a signal such as a sampling time or a sampling end time. The message transmission unit 105 transmits a message including the generated trigger signal to the sampling device 200 (step S1). Specifically, the message transmission unit 105 outputs a message including the generated trigger signal to the wireless transmission / reception unit 101. The wireless transmission / reception unit 101 generates a wireless signal including the trigger signal as a message content, and transmits the wireless signal via the antenna 106 to all the sampling devices 200 as a destination or by broadcast.

  When the wireless transmission / reception unit 101 receives a wireless signal from the sampling device 200 via the antenna 106, the wireless transmission / reception unit 101 passes a message included in the wireless signal to the message reception unit 102. When the message includes the valid signal information list, the message receiving unit 102 acquires and holds the valid signal information list (step S2).

  If there is a sampling apparatus 200 that has not acquired the valid signal information list (step S3: No), the wireless transmission and reception unit 101 and the message reception unit 102 repeatedly perform the process of step S2. When the valid signal information list is acquired from all the sampling devices 200 (step S3: Yes), the message receiving unit 102 outputs the valid signal information list to the signal detection unit 103. Note that the message receiving unit 102 may collect the valid signal information lists of all the sampling devices 200 after outputting them together and may output them to the signal detecting unit 103, and each time the valid signal information list is acquired from each sampling device 200. , And may be output to the signal detection unit 103.

  The signal detection unit 103 detects a fixed length signal using the valid signal information list of all the sampling devices 200 acquired from the message reception unit 102 (step S4). For example, the signal detection unit 103 creates a histogram with the signal lengths of all the signals included in the valid signal information list, and detects a signal having a ratio exceeding the set threshold as a fixed length signal. Alternatively, the signal detection unit 103 classifies a signal as a feature vector by using one or more information such as a reception frequency band included in the valid signal information list, and classifies a signal included in the valid signal information list. A signal whose variance is within a certain value is detected as a fixed length signal. These methods of detecting the fixed length signal in the signal detection unit 103 are an example, and the present invention is not limited to these methods. The signal detection unit 103 outputs information of the detected fixed length signal to the combination detection unit 104 together with the acquired valid signal information list.

  The combination detection unit 104 extracts two valid signal information lists from all valid signal information lists acquired from the signal detection unit 103, and from the combination of the two extracted valid signal information lists, the same frequency band among fixed length signals. It is checked whether or not the combination of signals used in the communication of has been detected (step S5). Among fixed-length signals, that is, first signals, signals used in communication in the same frequency band are referred to as second signals.

  For example, in the combination of the effective signal information lists of two sampling devices 200, the combination detection unit 104 determines that the effective frequency bands described in the respective effective signal information lists include the same band and have equal bandwidths. It is determined that the bands match, and it is determined that the combination of signals used in the communication of the same frequency band has been detected (step S5: Yes). The bandwidth being equal means, for example, an error range in which the bandwidth of the effective frequency band described in the other effective signal information list is defined with respect to the bandwidth of the effective frequency band described in one effective signal information list. It is the case of being inside. In the combination detection unit 104, for example, from the valid signal information list of two sampling devices 200, fixed length signals are arranged at equal density, and a region where the sampling devices 200 alternately receive fixed length signals Is detected as a connection. That is, in the combination of the valid signal information list, the combination detection unit 104 combines the signals used in the communication of the same frequency band based on the reception frequency and reception order of the fixed length signals in the two sampling devices 200. It determines that it detected.

  The combination detection unit 104 adds the combination of the identifiers of the two sampling devices 200 to the combination list. Based on the valid signal information lists linked to the two sampling apparatuses 200 added to the combination list, the combination detection unit 104 assumes that there is a relation between a call and a response in one communication, and performs one Communication exchange is detected as a connection. Specifically, the communication device A is located around one of the two sampling devices 200, the communication device B is located around the other sampling device 200, and one of the sampling devices 200 is from the communication device A. It is assumed that the wireless signal transmitted to the communication device B is received, and the other sampling device 200 receives the wireless signal transmitted from the communication device B to the communication device A.

  The combination detection unit 104 creates connection information using the fact that the same number of fixed length signals exist in the connection and that one connection is temporally dense for the detected connection (step S6). The connection information includes information on the combination of the sampling apparatus 200 of the transmission source of the valid signal information list including the reception state of the second signal, and information on the reception period of the second signal. The information on the combination of sampling devices 200 is indicated by the identifier of each sampling device 200. The information on the reception period of the second signal may be the reception start time and the reception duration time, or may be the reception start time and the reception end time.

  The combination detection unit 104 sets a collection of connection information as a connection list, and adds the created connection information to the connection list. FIG. 7 is a diagram showing an example of a connection list created by the combination detection unit 104 of the signal detection apparatus 100 according to the first embodiment. The connection list includes items of a sampling device, a reception start time, and a reception end time, and one line is one connection information. For convenience of explanation, in the item of the sampling device, the code of the sampling device 200 such as 200-1 and 200-2 shown in FIG. 1 is used, but in practice the identifier of the sampling device 200 is used. As described above, the item of the reception end time may be the reception duration time.

  The combination detection unit 104 uses the reception start time and the reception duration time included in each valid signal information list or the reception start time and the reception end time of all connection information added to the connection list. Check if there is a signal at the same time. The combination detection unit 104 determines that the relationship between the call and the response does not exist, that is, communication is not performed, for connection information in which a signal exists at the same time in the same frequency band, and deletes the connection information from the connection list. The combination detection unit 104 deletes, for example, a signal other than the signal with the largest average received power from the corresponding valid signal information list for connection information in which a signal is present at the same time in the same frequency band, and deletes it from the connection list. You may not do.

  The combination detection unit 104 includes an identifier of the sampling device 200 corresponding to a combination of valid signal information lists, reception start time and reception duration time of the second signal, or reception start time and reception included in each connection information of the connection list. The message transmission unit 105 is notified of the information on the end time.

  When the combination detection unit 104 can not detect the combination of signals used in the communication of the same frequency band (step S5: No), the combination detection unit 104 notifies the message transmission unit 105 of retransmission of the trigger signal. The signal detection apparatus 100 returns to step S1 and repeats the above-described processing. Although the combination detection unit 104 has detected the combination of signals used in the communication of the same frequency band (step S5: Yes), as a result of processing for excluding connection information from the connection list, the connection list is displayed in the connection list. If no connection information remains, resending of the trigger signal may be notified to the message transmitting unit 105 as in the case of step S5: No.

  Based on the information acquired from the combination detection unit 104, the message transmission unit 105 generates a signal extraction message for collecting, from the sampling apparatus 200, signal waveform data of signals included in the connection list. The signal extraction message includes information on the reception start time and reception duration time of the second signal, or the reception start time and reception end time. Further, the signal extraction message includes the identifier of the sampling device 200 corresponding to the combination of the valid signal information list. The message transmission unit 105 transmits the generated signal extraction message to the sampling device 200 (step S7).

  Specifically, the message transmission unit 105 outputs the generated signal extraction message to the wireless transmission / reception unit 101. The wireless transmission / reception unit 101 generates a wireless signal including a signal extraction message, and transmits the wireless signal via the antenna 106 as a destination or broadcast of the sampling device 200 that is the target of the signal extraction message. When the radio signal including the signal extraction message is transmitted by broadcast from the signal detection apparatus 100, the sampling apparatus 200 which is not the target of the signal extraction message discards the radio signal including the received signal extraction message. Here, the signal detection apparatus 100 is a signal indicating that it is not necessary to transmit signal waveform data to the sampling apparatus 200 that is not the target of the signal extraction message, that is, the sampling apparatus 200 that does not need to transmit signal waveform data. An extraction message may be sent. As a result, the sampling device 200 can avoid waiting for a response from the signal detection device 100, that is, waiting for a signal extraction message after transmitting the valid signal information list.

  When the wireless transmission / reception unit 101 receives a wireless signal from the sampling device 200 via the antenna 106, the wireless transmission / reception unit 101 passes a message included in the wireless signal to the message reception unit 102. The message receiving unit 102 transmits the acquired signal waveform data to the higher-level device 300 (step S9) when acquiring the signal waveform data contained in the message (step S8), which is a response to the aforementioned signal extraction message. .

  Next, the operation of the sampling device 200 will be described. FIG. 8 is a flowchart illustrating an example of the operation of the sampling device 200 according to the first embodiment. The flowchart shown in FIG. 8 is an example, and the order of each process may be switched if necessary, or each process may be parallelized. The values and threshold values set to the sampling device 200 may be set from the signal detection device 100 or may be set to the sampling device 200 by the user in advance.

  In the sampling device 200, when the wireless transmission / reception unit 201 receives a wireless signal from the signal detection device 100, the wireless transmission / reception unit 201 passes a message included in the wireless signal to the message reception unit 202. The message reception unit 202 waits until the content of the message receives a trigger signal for instructing the start of sampling (step S21: No). When the trigger signal is received (step S21: Yes), the message reception unit 202 instructs the wireless reception unit 203 to start sampling according to the information of the sampling period included in the trigger signal.

  The wireless reception unit 203 starts sampling of the signal in synchronization with the other sampling device 200 in the sampling period indicated by the trigger signal according to the instruction from the message reception unit 202 (step S22).

  As a method of performing sampling in synchronization with each other of the sampling devices 200, for example, an absolute time obtained from a GPS (Global Positioning System) device connected to the inside or outside of the sampling device 200 is used as the sampling start time included in the trigger signal. In the case of a system that performs relay communication such as an ad hoc network, time synchronization may be performed using a time synchronization method by wireless communication, and time synchronized in the network may be used. When the signal detection device 100 and the sampling device 200 constitute a star type system centering on the signal detection device 100, the sampling device 200 starts sampling from the time when the trigger signal is received from the signal detection device 100. Alternatively, sampling may be started based on the relative time from when the trigger signal included in the trigger signal is received to when sampling is started.

  The wireless reception unit 203 causes the signal waveform recording unit 204 to store signal waveform data obtained by performing sampling.

  The spectrogram creation unit 205 reads out the signal waveform data from the signal waveform recording unit 204, and creates a spectrogram of the signal waveform data (step S23). The spectrogram creation unit 205 performs, for example, fast Fourier transform (FFT) on the signal waveform data by shifting the signal samples to create a spectrogram in which spectral intensities in the time direction and in the frequency direction are mapped.

  The valid signal determination unit 206 detects, as a valid signal, a signal from which a low power signal such as noise is removed, using the spectrogram created by the spectrogram creation unit 205 (step S24). As a method of removing a low power signal, the valid signal determination unit 206 may calculate, for example, average power over the entire region of the signal, and detect a signal at time and frequency higher than the average power as a valid signal. A signal whose power is equal to or higher than the set threshold may be detected as a valid signal. Further, the valid signal determination unit 206 may arrange the signals in the order of the signal strength, and set a signal that occupies the top 1% at a set ratio, for example, all time, as a valid signal. Further, the valid signal determination unit 206 may use a combination of these methods.

  Further, the effective signal determination unit 206 divides a plurality of frequency bands by the set frequency division value, performs time integration of signal strength in each frequency band, and detects a frequency band having a large time integration value as an effective frequency band. (Step S25).

  Further, the valid signal determination unit 206 detects an interval in which a signal is present in the detected valid frequency band as the valid signal time (step S26). As a method of detecting a section in which a signal is present, the valid signal determination unit 206 may divide the section by a set time width and set a section in which a certain number of valid signals detected in step S24 exist as a valid signal time. The signal strength may be smoothed by signal processing such as, and the section above the threshold may be set as the effective signal time. The range of the valid signal time may be specified by the reception start time of the valid signal and the reception duration of the valid signal, or may be specified by the reception start time of the valid signal and the reception end time of the valid signal.

  The valid signal determination unit 206 creates a valid signal information list including the valid frequency band obtained by the detection, the reception start time, the reception duration time or the reception end time, and the average received power (step S27). The valid signal determination unit 206 outputs the created valid signal information list to the message transmission unit 207.

  The message transmission unit 207 generates a message including the valid signal information list acquired from the signal waveform extraction unit 208, and transmits the valid signal information list to the signal detection apparatus 100 (step S28). Specifically, the message transmission unit 207 outputs the generated message to the wireless transmission / reception unit 201. The wireless transmission and reception unit 201 generates a wireless signal having the valid signal information list as the message content, and transmits the generated wireless signal to the signal detection apparatus 100 via the antenna 106.

  When the wireless transmission / reception unit 201 receives a wireless signal from the signal detection apparatus 100, the wireless transmission / reception unit 201 passes a message included in the wireless signal to the message reception unit 202. The message reception unit 202 waits until receiving the signal extraction message (step S29: No). When the message extraction unit 202 receives the signal extraction message (step S29: Yes), the message reception unit 202 outputs the signal extraction message to the signal waveform extraction unit 208. When the sampling device 200 receives a signal extraction message indicating that it is not necessary to transmit signal waveform data from the signal detection device 100, the subsequent processing is omitted. Further, if the sampling device 200 can not receive the signal extraction message from the signal detection device 100 even after the specified time has elapsed after transmitting the valid signal information list, the sampling device 200 determines that the transmission of the signal waveform data is not necessary. And the subsequent processing may be omitted.

  The signal waveform extraction unit 208 extracts the signal waveform data of the extraction period indicated by the signal extraction message from the signal waveform recording unit 204 based on the signal extraction message acquired from the message reception unit 202 (step S30). The signal waveform extraction unit 208 outputs the extracted signal waveform data to the message transmission unit 207.

  The message transmission unit 207 generates a message including the signal waveform data acquired from the signal waveform extraction unit 208, and transmits the signal waveform data to the signal detection apparatus 100 (step S31). Specifically, the message transmission unit 207 outputs the generated message to the wireless transmission / reception unit 201. The wireless transmission / reception unit 201 generates a wireless signal having signal waveform data as message content, and transmits the generated wireless signal to the signal detection apparatus 100 via the antenna 106.

  If the sampling device 200 can not detect the valid signal in step S24, the sampling device 200 may terminate the subsequent processing, or may notify the signal detection device 100 that the valid signal could not be detected.

  FIG. 9 is a sequence diagram showing the relationship between the operation of the signal detection apparatus 100 and the operation of the sampling apparatus 200 according to the first embodiment. Although the operation of the signal detection device 100 is described in FIG. 6 and the operation of the sampling device 200 is described in FIG. 8, the operations of the respective devices cooperate with each other as described above. In the signal detection system 900, as shown in FIG. 9, first, as an instruction step, the signal detection apparatus 100 performs the operation of step S1. Next, the sampling apparatus 200 performs the operations from step S21 to step S28 as the valid signal information list transmission step. Next, as a signal extraction message transmission step, the signal detection apparatus 100 performs the operations from step S2 to step S7. Next, in the first signal waveform data transmission step, the sampling device 200 performs the operations from step S29 to step S31. Then, as the second signal waveform data transmission step, the signal detection apparatus 100 performs the operations from step S8 to step S9. FIG. 9 shows the operation of a signal waveform data collection method by the signal detection system 900.

  Although the effective signal information list includes the effective frequency band, the reception start time, the reception duration time or the reception end time, and the average received power, the present invention is not limited thereto, and the effective frequency band and the reception start time , And may include at least one or more of reception duration, reception end time, and average reception power.

  As described above, according to the present embodiment, the signal detection device 100 first collects, from the sampling device 200, the valid signal information list having a smaller amount of communication data compared to the signal waveform data, and The necessary extraction period of the signal waveform data is determined from the combination of the valid signal information list collected from 200, and notified to each sampling device 200. Each sampling device 200 transmits the signal waveform data instructed in the extraction period to the signal detection device 100. Thus, even in the case of a received signal whose waveform information is unknown, it is possible to reduce the amount of communication data from the sampling device 200 to the signal detection device 100, that is, the amount of communication data of signal waveform data. Further, the amount of communication data from the signal detection device 100 to the higher-level device 300 can be reduced.

Second Embodiment
In the first embodiment, specific operations of the signal detection apparatus 100 and the sampling apparatus 200 have been described. In the second embodiment, an illegal radio monitoring system for monitoring illegal radio waves using these devices will be described.

  FIG. 10 is a diagram showing a configuration example of the illegal radio wave monitoring system 910 according to the second embodiment. The illegal radio wave monitoring system 910 includes a signal detection device 100, sampling devices 200-1 to 200-4, and a host device 300. Although four sampling devices 200 are shown in FIG. 9, this is an example, and may be more or less than four. In the illegal radio wave monitoring system 910, the host device 300 is specifically an illegal radio wave monitoring device. In the illegal radio wave monitoring system 910, illegal radio wave sources 400-1 to 400-4 exist around the sampling device 200 installed. When the illegal radio wave sources 400-1 to 400-4 are not distinguished, they may be referred to as the illegal radio wave source 400.

  In the second embodiment, the sampling device 200 detects that the illegal radio wave sources 400-1 and 400-2 perform illegal communication. For signal waveform data of the illegal radio wave sources 400-1 and 400-2 performing illegal communication, the sampling device 200 transmits only the signal waveform data of a portion required by the processing of the first embodiment through the signal detection device 100. And notifies the upper apparatus 300, which is an illegal radio wave monitoring apparatus.

  The configurations of the signal detection device 100 and the sampling device 200 are the same as in the first embodiment. The signal detection apparatus 100 creates connection information and creates a connection list. FIG. 11 shows the contents of the connection list created based on the valid signal information list acquired by the signal detection apparatus 100 according to the second embodiment from the sampling apparatuses 200-1 to 200-4 by specific signal arrangement. It is a figure which shows the example of time. The signal detection apparatus 100 detects a fixed length signal, and divides the signal included in the information of the valid signal information list into a fixed length signal and a non-fixed length signal.

  In the signal detection apparatus 100, the combination detection unit 104 has a signal in both of the two sampling apparatuses 200 in the short time domain for the same effective frequency band, and the fixed length signal and the non-fixed length signal are constant. The areas 501 to 504 existing at the ratio of are detected as connections. The combination detection unit 104 excludes the connection information corresponding to the area 504 from the connection list on the assumption that there is no relation between the call and the response in the area 504 in which the signal exists at the same time among the areas 501 to 504. Further, the combination detection unit 104 excludes the connection information corresponding to the area 503 from the connection list on the assumption that the area 503 where the two sampling apparatuses 200 do not alternately receive the signal also has no relation between the call and the response.

  In the combination detection unit 104, only connection information corresponding to the areas 501 and 502 remains in the connection list. As a result, since the combination detection unit 104 includes only the signal information received by the sampling devices 200-1 and 200-2 in the areas 501 and 502, the illegal radio wave source 400 performing illegal communication is the sampling device 200-1. , 200-2 are determined to be close to each other in distance. When the position information of the sampling devices 200-1 and 200-2 is known, the combination detection unit 104 communicates with the second signal based on the position information of the sampling devices 200-1 and 200-2 corresponding to the connection information. It is possible to estimate the position of the communication system that is performing the communication, that is, the illegal radio wave source 400. The signal detection apparatus 100 can notify the upper apparatus 300, which is an illegal radio wave monitoring apparatus, of the position information of the communication system of the illegal radio wave source 400.

  As described above, according to the present embodiment, the signal detection device 100 detects the position of the illegal radio wave source 400 based on the position information of the sampling device 200 that has detected the illegal radio wave source 400 performing illegal communication. Can be estimated. Thus, as in the first embodiment, the signal detection apparatus 100 acquires the signal waveform data from which the unnecessary radio wave has been removed from the sampling apparatus 200 and transmits the acquired signal waveform data to the illegal radio wave monitoring apparatus which is the upper apparatus 300 and estimates the illegal radio wave. The location information of the source 400 can also be sent to the illegal radio monitoring device.

Third Embodiment
In the third embodiment, a signal source position estimation system that estimates the position of a signal source using the signal detection device 100 and the sampling device 200 will be described.

  The configurations of the signal detection device 100 and the sampling device 200 are the same as in the first embodiment. In the third embodiment, the combination detection unit 104 of the signal detection apparatus 100 does not determine that communication is not performed for a connection in which a signal exists at the same time in the same frequency band, and a signal transmitted by the same signal source Estimate the position of the signal source as having received

  FIG. 12 is a diagram showing a configuration example of a signal source position estimation system 920 according to the third embodiment. The signal source position estimation system 920 includes a signal detection device 100, sampling devices 200-1 to 200-3, and a host device 300. Although the number of sampling devices 200 is three in FIG. 12, this is an example and may be more or less than three. In the signal source position estimation system 920, a signal source 500 is present in the vicinity where the sampling device 200 is installed. The signal source position estimation system 920 uses the signal detection device 100 and the sampling device 200 to estimate the position of the signal source 500.

  The operation of the combination detection unit 104 of the signal detection apparatus 100 is focused on. The combination detection unit 104 detects a fixed length signal received at the same time in the same frequency band from the combination of the valid signal information list at the time of connection detection. When the fixed length signal is present at a plurality of times in the connection in the same region of the same frequency band at the same time, the combination detection unit 104 receives the average reception included in the valid signal information list. The position of the signal source 500 that is the transmission source of the detected fixed length signal is estimated based on the power and the position information of the sampling devices 200-1 to 200-3.

  FIG. 13 illustrates an example of information of the valid signal information list from the sampling devices 200-1 to 200-3 when the combination detection unit 104 of the signal detection device 100 according to the third embodiment estimates the position of the signal source 500. FIG. In the example of FIG. 13, in the valid signal information list acquired by the signal detection apparatus 100, the average received power of the signal received by the sampling apparatus 200-1 from the signal source 500 is the largest, and the sampling apparatus 200-3 is the next signal source. The average received power of the signal received from 500 is large, which indicates that the average received power of the signal received by the sampling device 200-2 from the signal source 500 is the smallest. As a method of estimating the position of the signal source 500, the combination detection unit 104 can estimate the position using, for example, the fact that the attenuation of radio waves is proportional to the square of the distance.

  As described above, according to the present embodiment, signal detection apparatus 100 detects the average received power of each sampling apparatus 200 in a region where a signal is present at the same time in the same frequency band at the time of connection detection, and The position of the signal source 500 can be estimated based on the position information of each sampling device 200.

Fourth Embodiment
In the fourth embodiment, when the connection is detected by the method of the first embodiment and the position of the signal source is estimated by the third embodiment or other methods, interference is prevented so that radio waves are not emitted around the signal source. An interference avoidance communication system that performs avoidance communication will be described.

  The configurations of the signal detection device 100 and the sampling device 200 are the same as in the third embodiment. In interference avoidance communication, for example, in cognitive radio communication in which communication is performed without giving interference to existing communication, communication is performed so that radio waves are not emitted in the direction of the existing signal source, specifically, the communication area of the existing signal source Is effective. The specific operation of the fourth embodiment will be described. FIG. 14 is a diagram of a configuration example of the interference avoidance communication system 930 according to the fourth embodiment. The interference avoidance communication system 930 includes the signal detection device 100, the sampling devices 200-1 and 200-2, the higher-level device 300, and the interference avoidance communication devices 700-1 to 700-3. When the interference avoidance communication devices 700-1 to 700-3 are not distinguished, they may be referred to as an interference avoidance communication device 700.

  The interference avoidance communication device 700 is a communication device including a known wireless transceiver and a directional antenna. The interference avoidance communication device 700 can communicate with other interference avoidance communication devices 700 that have received the communication permission instruction message only when the communication permission instruction message is received from the upper level device 300 or the signal detection device 100. It becomes. When the interference avoidance communication device 700 receives a message for instructing to stop communication from the higher-level device 300 or the signal detection device 100, the communication device 700 immediately stops communication.

  In FIG. 14, the signal detection apparatus 100 detects the connection of the sampling apparatuses 200-1 and 200-2 according to the method of the first embodiment, and estimates the position of the signal source according to the third embodiment or another method. Do. In this case, the signal detection apparatus 100 or the host device 300 emits radio waves in the directions of the existing communication sources 600-1 and 600-2, specifically, the communication areas of the existing communication sources 600-1 and 600-2. In order to avoid the problem, a communication permission indication message is sent to the communicable interference avoidance communication devices 700-1 and 700-2 to indicate that communication is possible. In FIG. 14, the signal detection apparatus 100 or the host apparatus 300 communicates with the interference avoidance communication apparatus 700-3 and the interference avoidance communication apparatus 700-1, and the interference avoidance communication apparatus 700-3 and the interference avoidance communication apparatus 700-2. It is determined that the communication of (1) may interfere with the communication with the existing communication sources 600-1 and 600-2. The signal detection device 100 or the higher-level device 300 considers the communication between the existing communication sources 600-1 and 600-2 and sends the interference avoidance communication devices 700-1 and 700-2 to the interference avoidance communication devices 700-1 and 700-2. A message of a communication permission instruction instructing to permit only the communication between 700-2 is transmitted.

  For example, when the signal detection apparatus 100 or the host apparatus 300 determines that the communication environment around the communication changes and the communication of the interference avoiding communication apparatus 700-1 and 700-2 gives interference to the existing communication source, for example, If any one of 700-1 and 700-2 is a movable terminal and it has moved into the communication area of the existing communication sources 600-1 and 600-2 due to the movement of either, communication stop instruction Is sent to the interference avoiding communication devices 700-1 and 700-2.

  The interference avoidance communication devices 700-1 and 700-2 perform communication when the message of the communication permission instruction is received, and immediately stop communication when the message of the communication stop instruction is received.

  The control for transmitting the message of the communication permission instruction and the message of the communication stop instruction to the interference avoiding communication devices 700-1 and 700-2 may be performed by the upper device 300, or the upper device 300 detects the signal. It may be transmitted via the device 100. Further, in the signal detection device 100, the combination detection unit 104 transmits the interference avoidance communication devices 700-1 and 700-2 to the interference detection communication devices 700-1 and 700-2 based on the connection detection result, the estimated positions of the existing communication sources 600-1 and 600-2, and the like. Control may be performed to transmit the message of the communication permission instruction and the message of the communication stop instruction.

  As described above, according to the present embodiment, the interference avoidance communication system 930 is the connection information detected by the same processing as that of the first embodiment, and the signal source estimated by the processing described in the third embodiment, etc. The interference avoidance communication device 700 can perform communication by using the position information of the above without interfering with the existing communication.

  The configuration shown in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and one of the configurations is possible within the scope of the present invention. Parts can be omitted or changed.

  DESCRIPTION OF SYMBOLS 100 signal detection apparatus, 101, 201 radio | wireless transmission / reception part, 102, 202 message reception part, 103 signal detection part, 104 combination detection part, 105, 207 message transmission part, 106, 209, 210 antenna, 200-1-200-6 Sampling device, 203 wireless receiving unit, 204 signal waveform recording unit, 205 spectrogram creating unit, 206 valid signal judging unit, 208 signal waveform extracting unit, 300 higher order apparatus, 400-1 to 400-4 illegal radio wave source, 500 signal source, 600-1, 600-2 existing communication sources, 700-1 to 700-3 interference avoidance communication devices, 900 signal detection system, 910 illegal radio wave monitoring system, 920 signal source position estimation system, 930 interference avoidance communication system.

Claims (11)

A signal detection unit for acquiring a valid signal information list indicating reception states of signals from a plurality of sampling devices, and detecting a first signal having a signal strength defined from the signals;
From the combination of the valid signal information list, a combination of a second signal which is a signal used in communication of the same frequency band among the first signals is detected, and the reception state of the second signal is included. A combination detection unit that generates connection information indicating a combination of sampling devices of a transmission source of the valid signal information list and a reception period of the second signal;
A message transmission unit that generates a signal extraction message indicating an extraction period of signal waveform data of the signal received by the sampling device based on the connection information, and transmits the message to the sampling device corresponding to the connection information;
A message receiving unit that outputs the valid signal information list from the sampling device to the signal detection unit when receiving the valid signal information list, and transmits the signal waveform data that is a response to the signal extraction message from the sampling device to a host device When,
A signal detection apparatus comprising: The valid signal information list includes at least one or more of an effective frequency band, a reception start time, a reception duration, a reception end time, and an average received power.
The signal detection device according to claim 1, characterized in that: The combination detection unit detects a combination of the second signals based on the reception frequency and the reception order of the first signals in two sampling devices in the combination of the valid signal information list.
The signal detection apparatus according to claim 1 or 2, wherein The combination detection unit deletes the corresponding connection information when the first signal is present at the same time in the same frequency band in the combination of the valid signal information list.
The signal detection device according to any one of claims 1 to 3, characterized in that: The combination detection unit validates the first signal other than the first signal with the highest average received power when the first signal is present at the same time in the same frequency band in the combination of the valid signal information list. Delete from the signal information list,
The signal detection device according to any one of claims 1 to 3, characterized in that: A wireless reception unit that starts sampling based on an instruction from the signal detection device;
A signal waveform storage unit for storing signal waveform data which is waveform data of a signal received by sampling in the wireless receiving unit;
A spectrogram creation unit that creates a spectrogram using the signal waveform data;
A valid signal determination unit that creates a valid signal information list using the spectrogram;
A message transmission unit that transmits a message including the valid signal information list to the signal detection device;
A signal waveform extraction unit for extracting the signal waveform data of an extraction period indicated by a signal extraction message received from the signal detection device from the signal waveform storage unit;
Equipped with
The message transmission unit transmits a message including the signal waveform data extracted by the signal waveform extraction unit to the signal detection device.
A sampling device characterized by The valid signal information list includes at least one or more of an effective frequency band, a reception start time, a reception duration, a reception end time, and an average received power.
The sampling device according to claim 6, characterized in that: A signal detection device according to any one of claims 1 to 5,
A sampling device according to claim 6 or 7,
Equipped with
The signal detection device estimates the position of the communication system performing communication with the second signal based on the position information of the sampling device corresponding to the connection information, and uses the position information of the communication system as the upper-level device. Send,
An illegal radio surveillance system characterized by A signal detection device according to claim 1;
A sampling device according to claim 6;
Equipped with
The signal detection apparatus detects a first signal received at the same time in the same frequency band from a combination of the valid signal information list, and average received power of the first signal included in each valid signal information list, And estimating a position of a signal source that is a transmission source of the detected first signal based on position information of the sampling device.
A signal source position estimation system characterized in that. A signal detection device of the signal source position estimation system according to claim 9;
A sampling device of the signal source position estimation system according to claim 9;
A communication device,
Equipped with
The signal detection device or the upper-level device transmits a communication permission instruction message for permitting communication to a communication device outside the communication area which is a defined range from the position of the signal source, and transmits the communication permission instruction message. And transmitting a communication stop instruction message instructing the communication device whose position has become within the communication area among the received communication devices to stop communication.
The communication device starts communication when the communication permission instruction message is received, and stops communication when the communication stop instruction message is received.
Interference avoidance communication system characterized in that. An instruction step in which the signal detection device instructs the sampling device to perform sampling;
A valid signal information list transmission step of the sampling device creating a valid signal information list indicating a reception state of a signal using the signal waveform data obtained by sampling, and transmitting the list to the signal detection device;
A signal extraction message transmitting step of generating a signal extraction message indicating an extraction period of the signal waveform data based on the valid signal information list, and transmitting the signal extraction message to the sampling device;
A first signal waveform data transmission step in which the sampling device transmits the signal waveform data indicated in the extraction period to the signal detection device;
A second signal waveform data transmission step in which the signal detection device transmits the acquired signal waveform data to a host device;
A signal waveform data collection method comprising:

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