JP2014027594A - Electric wave type determination system and electric wave type determination method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an electric wave type determination system and an electric wave type determination method capable of surely determining an electric wave type by identifying interference sources of various types of interference electric waves, while being capable of establishing an optimum communication state, even when using a signal processor which does not have high processing capability.SOLUTION: A detection unit 10 calculates a reception intensity signal from a reception signal received by an antenna 1, and outputs the calculated signal. A processing unit 20 divides a used frequency band by each of different band widths on the basis of the reception intensity signal, and detects electric wave intensity for frequencies scanned in a plurality of bands or frequencies of a plurality of assumed communication systems. A determination unit 30 sums up the number of emergence of the detected reception intensity for each frequency band and for each electric wave intensity; and determines an electric wave type for each band on the basis of an emergence pattern of the maximum value and the average value of the electric wave intensity, an electric wave intensity whose emergency frequency is maximum, and an electric wave intensity whose emergency frequency is next to the maximum.

Description

  The present invention relates to a radio wave type determination system and a radio wave type determination method for detecting a radio wave in a communication system and determining the type of the detected radio wave.

  In a communication system, in order to establish a good communication state, it detects the interference radio waves within the usable band, measures the interference radio wave intensity of multiple channels, and selects the channel with the highest S / N ratio. Method is used.

  As such a system, a radio wave monitoring device including a distribution unit, an FFT converter, a phase difference detection unit, a storage unit, and a signal extractor is known (for example, see Patent Document 1). In this radio wave monitoring apparatus, the distribution unit distributes the received radio wave signal into an in-phase component and a quadrature component. The FFT converter performs a fast Fourier transform process on the distributed in-phase component and quadrature component. The phase difference detection means compares the in-phase component and the quadrature component output from the FFT converter, and detects the phase difference of the received radio wave signal. The storage means stores the frequency spectrum for each time output from the FFT converter and having a peak level frequency value.

  Further, the signal extractor obtains the radio wave specification from the frequency bandwidth based on the fluctuation bandwidth and the appearance time of the frequency value of the peak level of the frequency spectrum for each time stored in the storage means, and the frequency distribution of the frequency spectrum, This radio wave specification is compared with the radio wave specification of the target wave set in advance to determine whether the received radio wave signal is the target wave or not, and the fluctuation bandwidth and appearance time of the frequency value and the frequency distribution of the frequency spectrum The modulation method of the received radio wave signal is identified from the frequency bandwidth based on and the phase difference detected by the phase difference detection means.

Japanese Patent No. 3903814

However, the prior art has the following problems.
In conventional radio wave monitoring equipment, fast Fourier transform is used to reliably detect radio waves of communication systems with different modulation methods and bandwidths, identify the interference source by determining the radio wave type, and select the optimum channel. There is a problem that a signal processor having a high processing capability capable of conversion or the like is required.

  The present invention has been made in order to solve the above-described problems. Even when a signal processor having no high processing capability is used, it is possible to identify and reliably identify various interference radio wave interference sources. An object of the present invention is to obtain a radio wave type determination system and a radio wave type determination method capable of determining a radio wave type and establishing an optimal communication state.

  The radio wave type determination system according to the present invention divides a frequency band to be used by a different bandwidth based on a detection unit that obtains and outputs a received intensity signal from a received signal received by an antenna, and the received intensity signal. , The processing unit that detects the radio wave intensity for the frequency scanned in multiple bands or the frequency of multiple assumed communication methods, and the number of occurrences of the detected received intensity for each frequency band and radio wave intensity are tabulated And a determination unit that determines the type of radio wave for each band based on the appearance pattern of the radio wave intensity having the highest appearance frequency, the average value, the radio wave intensity having the highest appearance frequency, and the radio wave intensity having the second highest occurrence frequency.

  The radio wave type determination method according to the present invention includes a detection step of obtaining and outputting a received intensity signal from a received signal received by an antenna, and dividing a frequency band to be used by a different bandwidth based on the received intensity signal. , Processing step to detect radio wave intensity for frequencies scanned in multiple bands or frequencies of multiple assumed communication methods, and count the number of appearances of detected received intensity for each frequency band and radio wave intensity, And a determination step of determining the type of radio wave for each band based on the appearance pattern of the radio wave intensity having the largest number, the highest value, and the second highest number of appearance.

According to the radio wave type determination and radio wave type determination method according to the present invention, the detection unit (step) obtains and outputs a reception intensity signal from the reception signal received by the antenna, and the processing unit (step) receives the reception intensity signal. Based on the above, the frequency band to be used is divided into different bandwidths, and the radio wave intensity is detected for the frequency scanned in the plurality of bands or the frequency of the plurality of communication schemes assumed, and the determination unit (step) Counts the number of occurrences of detected received intensity for each frequency band and radio field strength, based on the maximum value, average value, radio wave intensity with the highest number of radio field strengths, and the appearance pattern of the second highest radio field strength The radio wave type is determined for each band.
Therefore, even when a signal processor that does not have high processing capability is used, it is possible to identify the interference source of various interfering radio waves, reliably determine the radio wave type, and establish an optimal communication state It is possible to obtain a radio wave type determination system and a radio wave type determination method.

It is a block block diagram which shows the electromagnetic wave classification determination system which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows operation | movement of the process part of the electromagnetic wave classification determination system which concerns on Embodiment 1 of this invention. It is a flowchart which shows operation | movement of the determination part of the electromagnetic wave classification determination system which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the example of a preservation | save of the appearance number for every receiving band and every radio field intensity value of the 1st-4th measurement mode in the electromagnetic wave classification determination system which concerns on Embodiment 1 of this invention. Description showing an example in which the number of appearances for each reception band and for each radio wave intensity value in the first to fourth measurement modes in the radio wave type determination system according to Embodiment 1 of the present invention is averaged from n bands to m bands. FIG. It is explanatory drawing which shows the smoothing process of the appearance number data in the electromagnetic wave classification determination system which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the detection process of the radio wave intensity with many appearances in the radio wave type determination system which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the example of the preservation | save data of the maximum value for every band in the radio wave classification determination system which concerns on Embodiment 1 of this invention, an average value, and the radio | wireless intensity value of the level 1 and the level 2. It is explanatory drawing which shows the example of the determination threshold value of the radio wave type in all the bands in the radio wave type determination system which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the example of the determination threshold value of the radio wave classification for every zone | band in the radio wave type determination system which concerns on Embodiment 1 of this invention.

  Hereinafter, preferred embodiments of a radio wave type determination system and a radio wave type determination method according to the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts will be described with the same reference numerals. .

Embodiment 1 FIG.
FIG. 1 is a block configuration diagram showing a radio wave type determination system according to Embodiment 1 of the present invention. In FIG. 1, the radio wave type determination system includes an antenna 1, a detection unit 10, a processing unit 20, and a determination unit 30.

  The detection unit 10 obtains a reception intensity signal 210 from the reception signal input from the antenna 1 and outputs it to the processing unit 20. The processing unit 20 obtains the frequency control signal 220 and the bandwidth control signal 230 from the reception intensity signal 210 input from the detection unit 10 and outputs the frequency control signal 220 and the bandwidth control signal 230 to the detection unit 10 and obtains the reception intensity signal 240 for each band. Output to 30. The determination unit 30 selects an optimum band for determination of radio wave type and communication from the reception intensity signal 240 for each band input from the processing unit 20.

Next, the function of the detection unit 10 will be described.
Here, the detection unit 10 includes an RF amplifier 110, a local oscillator 120, a mixer 130, a band pass filter 140, and an A / D conversion circuit 150. The RF amplifier 110 amplifies the reception signal from the antenna 1 to a level necessary for detection and outputs the amplified signal to the mixer 130.

  The local oscillator 120 oscillates a signal having a frequency corresponding to the frequency control signal 220 from the processing unit 20. The mixer 130 converts the amplified reception signal from the RF amplifier 110 into a reception signal in an intermediate frequency band corresponding to the signal from the local oscillator 120 and outputs the reception signal to the band pass filter 140.

  The band pass filter 140 limits the band of the received signal converted into the intermediate frequency band signal based on the bandwidth control signal 230 from the processing unit 20 and outputs the band signal to the A / D conversion circuit 150. The A / D conversion circuit 150 digitally converts the received signal whose band is limited and outputs the received signal as the received intensity signal 210 to the processing unit 20.

Next, functions of the processing unit 20 will be described.
The processing unit 20 outputs a frequency control signal 220 to the local oscillator 120 in order to sequentially detect the radio wave intensity from a lower limit value to an upper limit value of a preset frequency band. Further, the processing unit 20 outputs a bandwidth control signal 230 for setting the bandwidth of the reception intensity signal 210 to the band pass filter 140. Thereby, the reception intensity signal 210 in the set band can be obtained.

  Note that a plurality of scanning patterns can be set by changing the frequency changing step at the time of frequency scanning while switching the bandwidth to be scanned when detecting the radio wave intensity. The reception intensity signal 240 for each band of each frequency within the detection frequency range obtained by such processing is output to the determination unit 30.

  FIG. 2 is an explanatory diagram showing the operation of the processing unit 20 of the radio wave type determination system according to Embodiment 1 of the present invention. Here, a concept is shown in which the processing unit 20 performs frequency scanning with a plurality of scanning patterns to detect the radio wave intensity. Note that the processing unit 20 has a plurality of measurement modes in which a reception band and an intensity measurement time are set in accordance with a burst wave of a communication method assumed to be detected when the radio field intensity is measured.

  In FIG. 2, in the first measurement mode, a predetermined first bandwidth X1 is set, and the frequency band for detecting the radio wave intensity is divided into a plurality of bands in units of the first bandwidth X1. Further, the radio wave intensity is detected by changing the frequency within the band while sequentially shifting the band from the band having the lowest center frequency to the band having the highest center frequency.

  Subsequently, in the second measurement mode, a predetermined second bandwidth X2 different from the first bandwidth X1 is set, and the frequency band for detecting the radio wave intensity is divided into a plurality of bands in units of the second bandwidth X2. Further, the radio wave intensity is detected by changing the frequency within the band while sequentially shifting the band from the band having the lowest center frequency to the band having the highest center frequency.

  Next, in the third measurement mode, a predetermined third bandwidth X3, the smallest first frequency H1 in the assumed communication method, and the first frequency shift Y1 in the assumed communication method are set. Further, the frequency within the band is changed while sequentially shifting the band from the band of the third bandwidth X3 having the first frequency H1 as the center frequency to the band having the largest center frequency according to the first frequency shift Y1. Change the signal strength to detect.

  Subsequently, in the fourth measurement mode, a predetermined fourth bandwidth X4, the smallest second frequency H2 in the assumed communication method, and the second frequency shift Y2 in the assumed communication method are set. In addition, the frequency within the band is changed while sequentially shifting the band from the band of the fourth bandwidth X4 having the second frequency H2 as the center frequency to the band having the largest center frequency according to the second frequency shift Y2. Change the signal strength to detect.

  Here, in the detection of the radio wave intensity in the first measurement mode and the second measurement mode, the optimum bandwidth and detection time are set for the modulation content of the assumed communication method, and the third measurement mode and the fourth measurement mode are set. The detection of the radio wave intensity in the case of the modulation method and frequency of the communication system that communicates while sequentially changing the frequency, and by setting the optimum bandwidth, detection time and frequency for detection, multiple detection frequencies A range of communication methods can be supported.

  Note that FIG. 2 shows the concept of radio wave intensity detection when four types of measurement modes from the first measurement mode to the fourth measurement mode are set, but the present invention is not limited to this, and is assumed within the frequency band to be detected. When there are many communication systems to be used, it is possible to cope with many communication systems by adding a measurement mode.

Next, the function of the determination unit 30 will be described.
The determination unit 30 is a part that determines a radio wave type for selecting a band in which wireless communication such as a wireless LAN is performed, and within a detection frequency range set based on the reception intensity signal 240 for each band from the processing unit 20. The frequency used for communication is changed by selecting a band in which no interference radio wave exists.

  At this time, the determination unit 30 includes a plurality of bands at the time of radio wave detection in the reception intensity signal 240 for each band from the processing unit 20 and a detection result of the radio wave intensity according to a plurality of scanning patterns by a plurality of frequency steps. The radio wave type is determined based on the radio wave intensity of each frequency band obtained by the integration.

FIG. 3 is a flowchart showing the operation of the determination unit 30 of the radio wave type determination system according to Embodiment 1 of the present invention.
First, the radio field intensity in the frequency range to be detected is measured in the reception bands X1 to X4 in the four types of measurement modes of the first to fourth measurement modes (step S101). This step S101 is the operation of the processing unit 20 described above.

Subsequently, the radio field intensity values of the four types of measurement modes measured in step S101 are stored (step S102).
Next, the number of appearances for each reception band and each radio wave intensity value is tabulated from the radio wave intensity values measured in the four measurement modes of the first to fourth measurement modes (step S103).

Subsequently, in the first to fourth measurement modes, it is determined whether or not measurement for the set period has been performed (step S104).
If it is determined in step S104 that the measurement for the set period has not been performed (that is, No), the process proceeds to step S101.

  On the other hand, if it is determined in step S104 that the measurement for the set period has been performed (that is, Yes), the values are counted from the values of the radio field intensity measured in the four measurement modes of the first to fourth measurement modes. The number of appearances is stored (step S105). Here, FIG. 4 shows an example of storing the number of appearances for each reception band and each radio field intensity value in the first to fourth measurement modes.

  Next, the maximum value for each reception band is calculated and stored based on the data of the number of appearances totaled from the values of the radio field intensity measured in the four measurement modes of the first to fourth measurement modes (step S106). .

  Subsequently, the number of bands is averaged from n to m based on the data of the number of appearances aggregated from the values of the radio field intensity measured in the four types of measurement modes of the first to fourth measurement modes (step S107). . Here, an example of data on the number of appearances after averaging is shown in FIG.

  Next, smoothing processing is performed on the number of occurrences of radio field intensity values in the first measurement mode and the second measurement mode for each of m bands (step S108). Here, an outline of the smoothing process is shown in FIG.

  Subsequently, the maximum value and the average value of the radio field intensity values are calculated for each of m bands from the radio field intensity values measured in the four types of measurement modes of the first to fourth measurement modes, and stored together with the number of appearances ( Step S109).

  Next, from the radio wave intensity values after the smoothing process in the first measurement mode and the second measurement mode, the radio wave intensity having the highest number of appearances (level 1) and the radio wave intensity having the second highest number of appearances (level 2) are banded. Detection is performed every time (step S110). Here, FIG. 7 shows an outline of detection processing of level 1 and level 2 radio wave intensity values for each band, and examples of stored data of the maximum value, average value, and level 1 and level 2 radio wave intensity values for each band. As shown in FIG.

  Subsequently, for the radio wave types A to F, it is sequentially determined whether the conditions of the radio wave type are met in all m bands (step S111). Here, an example of the determination threshold value of the radio wave type in all bands is shown in FIG.

Next, it is determined whether or not there is a radio wave type that meets the determination condition for the radio wave type (step S112).
If it is determined in step S112 that there is no radio wave type that matches the determination condition (that is, No), the process proceeds to step S111.

  On the other hand, if it is determined in step S112 that there is a radio wave type that matches the determination condition (that is, Yes), the compatible radio wave type is recorded as applicable (step S113).

Subsequently, it is determined whether the determination is completed for all the radio wave types A to F (step S114).
If it is determined in step S114 that determination has not been completed for all the radio wave types A to F (that is, No), the process proceeds to step S111.

  On the other hand, if it is determined in step S114 that the determination has been completed for all of the radio wave types A to F (that is, Yes), the radio wave type conditions are set for each of the m bands for the radio wave types A to G. Are sequentially determined (step S115). Here, an example of the determination threshold value of the radio wave type in each band is shown in FIG.

Next, for each of the m bands, it is determined whether or not there is a radio wave type that meets the radio wave type determination condition (step S116).
If it is determined in step S116 that there is no radio wave type that matches the determination condition (that is, No), the process proceeds to step S115.

  On the other hand, if it is determined in step S116 that there is a radio wave type that matches the determination condition (that is, Yes), the compatible radio wave type is recorded as applicable for each band (step S117).

Subsequently, it is determined whether or not the determination is completed for all the radio wave types A to G (step S118).
If it is determined in step S118 that determination has not been completed for all the radio wave types A to G (that is, No), the process proceeds to step S115.

  On the other hand, if it is determined in step S118 that determination has been completed for all the radio wave types A to G (that is, Yes), the maximum value and average value of each band and the determination result of the radio wave type are output. (Step S119), and the process of FIG.

As described above, according to the first embodiment, the detection unit obtains and outputs a reception intensity signal from the reception signal received by the antenna, and the processing unit determines the frequency band to be used based on the reception intensity signal. Divide each with different bandwidths to detect the radio wave intensity for the frequency scanned in multiple bands or the frequency of multiple assumed communication methods, and the determination unit is for each frequency band and radio wave intensity of the detected reception intensity And the radio wave type is determined for each band based on the maximum value, the average value, the radio wave intensity with the highest number of appearances, and the appearance pattern of the radio wave intensity with the second highest number of appearances.
Therefore, even when a signal processor that does not have high processing capability is used, it is possible to identify the interference source of various interfering radio waves, reliably determine the radio wave type, and establish an optimal communication state It is possible to obtain a radio wave type determination system and a radio wave type determination method.

  1 antenna, 10 detection unit, 20 processing unit, 30 determination unit, 110 RF amplification unit, 120 local oscillator, 130 mixer, 140 band pass filter, 150 A / D conversion circuit, 210 reception intensity signal, 220 frequency control signal, 230 Bandwidth control signal, 240 received intensity signal for each band.

The radio wave type determination system according to the present invention includes a detection unit that obtains and outputs a received intensity signal from a received signal received by an antenna, and a frequency band to be used for each of a plurality of different measurement modes based on the received intensity signal. , and divided in different frequency bandwidths, and a processing unit that detects the radio wave intensity of the frequency of the plurality of communication scheme in which the scanning frequency or assumed in divided in a plurality of frequency bands, the detected reception intensity, Aggregate the number of occurrences for each divided frequency band and radio field strength, based on the maximum, average value, radio wave intensity with the most occurrences, and the appearance pattern of the radio wave intensity with the second most occurrences, And a determination unit that determines a radio wave type for each of the divided frequency bands.

The radio wave type determination method according to the present invention includes a detection step of obtaining and outputting a received intensity signal from a received signal received by an antenna, and a frequency band to be used for each of a plurality of different measurement modes based on the received intensity signal. , and divided in different frequency bandwidths, the processing step of detecting a radio wave intensity of the frequency of the plurality of communication scheme in which the scanning frequency or assumed in divided in a plurality of frequency bands, the detected reception intensity, Aggregate the number of occurrences for each divided frequency band and radio field strength, based on the maximum, average value, radio wave intensity with the most occurrences, and the appearance pattern of the radio wave intensity with the second most occurrences, And a determination step of determining a radio wave type for each divided frequency band.

Claims (8)

From the received signal received by the antenna, a detection unit that obtains and outputs a received intensity signal;
Based on the received intensity signal, each of the frequency bands to be used is divided by different bandwidths, and a processing unit that detects the radio field intensity for a frequency scanned in a plurality of bands or a frequency of a plurality of assumed communication methods,
Counts the number of occurrences of detected received intensity for each frequency band and radio field strength, based on the maximum value, average value, radio wave intensity with the highest number of radio field strengths, and the appearance pattern of the second highest radio field strength A determination unit for determining a radio wave type for each band;
A radio wave type determination system characterized by comprising: The detector is
An RF amplifier for amplifying a received signal from the antenna;
A mixer for converting the amplified received signal to an intermediate frequency;
A local oscillator that changes the oscillation frequency under the control of the processing unit;
A bandpass filter that changes a bandwidth detected by control from the processing unit;
An A / D conversion circuit that digitally converts the received signal that has passed through the band-pass filter,
The processor is
At least once in each measurement cycle, the radio wave intensity is determined by scanning the frequency in a plurality of bands obtained by dividing a predetermined frequency band for detecting the radio wave intensity by a predetermined first bandwidth. Detect
The radio wave intensity is detected by scanning the frequency in a plurality of bands obtained by dividing by a second bandwidth different from the first bandwidth,
Within the frequency band, the radio wave intensity is detected by scanning the frequency in a plurality of bands separated by the first frequency shift,
Within the frequency band, a radio frequency intensity is detected by scanning a frequency in a plurality of bands separated and separated by a second frequency shift different from the first frequency shift,
From the radio field intensity detected in multiple measurement periods including the radio field intensity detected in the measurement period, the maximum radio field intensity is calculated for each band,
The determination unit
Calculate the number of occurrences of the detected radio field intensity for each frequency band and radio field intensity,
Average the number of occurrences calculated for each frequency band in multiple frequency bands,
Smooth the number of occurrences averaged over multiple frequency bands,
From the number of appearances that have been smoothed, calculate a value indicating the level 1 radio wave intensity with the highest number of appearances and the level 2 radio wave intensity with the second highest number of appearances for each band after averaging,
The radio wave type of the entire band is determined from the calculated maximum value, average value, and level 1 and level 2 appearance patterns for each frequency band,
The radio wave type determination system according to claim 1, wherein the radio wave type for each band is determined from the calculated maximum value, average value, and level 1 and level 2 appearance patterns of radio wave intensity for each frequency band. The radio wave type determination according to claim 2, wherein the determination unit determines an assumed radio wave type based on a predetermined maximum value, average value, and level 1 and level 2 radio wave type determination conditions. system. The determination unit
Calculates the number of appearances for each of multiple bandwidths from radio wave intensity signals over a certain period of time obtained by scanning the frequency within multiple bands of different bandwidths or within bands that are discrete with different frequency shifts. ,
Average the calculated number of occurrences across multiple bandwidths,
From the average number of appearances, calculate the maximum value, average value, field strength value with the highest number of occurrences, and field strength value with the second highest number of occurrences,
2. The radio wave type according to claim 1, wherein the radio wave type determination is performed based on an appearance pattern of a maximum value, an average value, a radio wave intensity value having the highest number of appearances, and a radio wave intensity value having the second highest number of appearances for each bandwidth. Type determination system. The determination unit further includes:
For the entire target bandwidth, determine each radio wave type using a preset threshold for each radio wave type,
Each radio wave type is determined based on a determination threshold value for each radio wave type set in advance for each of a plurality of bandwidths based on the determination result. The radio wave type determination system described in 1. A detection step of obtaining and outputting a received intensity signal from the received signal received by the antenna;
Based on the received intensity signal, a processing step of dividing a frequency band to be used by a different bandwidth, and detecting a radio field intensity for a frequency scanned in a plurality of bands or a frequency of a plurality of assumed communication methods;
Counts the number of occurrences of detected received intensity for each frequency band and radio field strength, based on the maximum value, average value, radio wave intensity with the highest number of radio field strengths, and the appearance pattern of the second highest radio field strength A determination step for determining a radio wave type for each band;
A radio wave type determination method comprising: The processing step includes
At least once in each measurement cycle, the radio wave intensity is determined by scanning the frequency in a plurality of bands obtained by dividing a predetermined frequency band for detecting the radio wave intensity by a predetermined first bandwidth. Detecting step;
Scanning the frequency in a plurality of bands obtained by dividing by a second bandwidth different from the first bandwidth to detect the radio field intensity;
Within the frequency band, detecting a radio wave intensity by scanning a frequency in a plurality of bands separated and separated by a first frequency shift;
Within the frequency band, detecting a radio wave intensity by scanning a frequency in a plurality of bands separated and separated by a second frequency shift different from the first frequency shift; and
Calculating the maximum radio wave intensity for each band from the radio wave intensity detected in a plurality of measurement periods including the radio wave intensity detected in the measurement period,
The determination step includes
Calculating the number of occurrences of the detected radio wave intensity for each frequency band and radio wave intensity;
Averaging the number of occurrences calculated for each frequency band in a plurality of frequency bands;
Smoothing the number of occurrences averaged over a plurality of frequency bands;
Calculating a value indicating the level 1 radio wave intensity having the highest number of appearances and the level 2 radio wave intensity having the second highest number of appearances from each smoothed number of appearances;
Determining the radio wave type of the entire band from the maximum value, average value, and level 1 and level 2 appearance patterns of the calculated radio field intensity for each frequency band;
The step of determining the radio wave type for each band from the calculated maximum value, average value, and level 1 and level 2 appearance patterns of the radio wave intensity for each frequency band is included. Radio wave type determination method. The determination step includes
Calculates the number of appearances for each of multiple bandwidths from radio wave intensity signals for a certain period of time obtained by scanning a frequency within a plurality of bands of different bandwidths or within bands separated by different frequency shifts. Steps,
Averaging the calculated number of occurrences across multiple bandwidths;
Calculating a maximum value, an average value, a radio field strength value with the highest number of appearances, and a radio field strength value with the second highest number of appearances from the averaged number of appearances;
And a step of determining a radio wave type from an appearance pattern of a maximum value, an average value, a radio wave intensity value having the highest number of occurrences, and a radio wave intensity value having the second highest number of occurrences for each bandwidth. 6. The radio wave type determination method according to 6.

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