JP7050850B2 - Radar detection program - Google Patents

Description

The present invention relates to a radio device and a radar detection method, and more particularly to a radio device and a radar detection method having a dynamic frequency selection (DFS) function.

Dynamic frequency selection (hereinafter referred to as DFS) means that wireless LAN (Local Area Network) equipment that uses the 5.3 GHz band or higher (W53 and W56) can be used for weather radars and marine radars that use the same frequency band. It is a mechanism to prevent interference.

For example, a weather radar is a system that emits multiple pulses per second in the C band (5 GHz band) and grasps interfering substances such as rain clouds by the pulse echo, so noise from wireless LAN equipment is mistakenly recognized as an interfering object. there is a possibility. Therefore, wireless LAN devices that use the 5.3 GHz band or higher are equipped with a DFS function that changes the channel (frequency) used by the wireless LAN device to avoid interference when a predetermined level of radio waves from the radar is detected. Is an essential requirement. The radio wave from the radar is referred to as a radar wave or a radar signal.

As a wireless LAN device that uses the 5.3 GHz band or higher, there are standards of IEEE802.11a, IEEE802.11n, and IEEE802.11ac. IEEE is an abbreviation for "Institute of Electrical and Electronic Engineers". Then, there is IEEE802.11h as a standard defined for the above-mentioned coexistence control of the 5 GHz band wireless LAN.

As a DFS, the following functions are generally defined.

First, the effectiveness check (CAC, Channel Availability Check) is performed to intercept whether or not there is a radar wave in the channel used for communication for a certain period (60 seconds) after the device is started. If a radar wave is detected during the CAC period, the use of that channel is abandoned and the channel is changed to another free channel for CAC.

When the effectiveness is confirmed by CAC, the channel is started to be used, but radar waves are always detected even during operation (In-Service Monitoring).

Then, when a radar wave is detected, the emission of radio waves from the own device is immediately stopped (within 10 seconds according to the standard) (Channel Move Time). After that, it is stipulated that radio waves are not emitted (Non-Occupancy Period) for a certain period of time (30 minutes or more according to the standard) to the channel where the radar wave is detected once.

The radar radio wave that is the target of DFS operation specified in Japan's W56 band is in the form of pulse-modulated radio signals output at regular intervals and in an intermittent burst state, and the pulse conditions are those of the radar. It is open to the public as a feature point of radar pulse. This feature is defined by the pulse width (Pw), pulse repetition frequency (PRF, Pulse Repetition Frequency) or pulse repetition interval (PRI, Pulse Repetition Interval), number of consecutive pulses (Pn), and repetition period (Tcycle). ing.

At present, the characteristic points of the radar pulse of the radar differ from region to region, and the characteristic points of the radar pulse of the radar targeted in each region are also disclosed in Europe and North America. Therefore, even in the wireless LAN equipment operating in those areas, the function of detecting the radio wave of the radar having the characteristic point of the radar pulse according to each area and operating the DFS is indispensable.

Patent Documents 1 to 3 are documents that disclose the above-mentioned techniques related to radar detection and DFS.

Patent Document 1 discloses a technique for reliably identifying a radar signal from a received radio frequency (RF, Radio Frequency) signal for the purpose of avoiding erroneous detection of a signal other than the radar signal as a radar signal.

According to the technique disclosed in Patent Document 1, the wireless network apparatus determines whether or not the RF signal is a legitimate wireless data packet by obtaining the correlation of a series of predetermined portions of the RF signal. The wireless network device obtains the signal strength of the received RF signal, and when the signal strength exceeds a predetermined threshold and determines that the RF signal is not a legitimate radio data packet, the wireless network device uses a predetermined algorithm to signal the RF signal. Measure parameters such as pulse width and frequency. The wireless network device compares the measured parameters with the exemplary parameters of a known type of radar signal to determine if the RF signal is a known type of radar signal. If the wireless network device determines in this determination that the RF signal is a known type of radar signal, it determines that the channel should be changed.

Patent Document 2 discloses a system in which a radar can be efficiently and accurately specified in a wireless LAN device and the device can switch frequency channels without undue load on the traffic processing throughput.

In the technique disclosed in Patent Document 2, in order to correctly identify the received non-LAN signal as a radar signal, an event is analyzed using a predetermined algorithm, and it is determined whether or not the event is a radar signal. Periodicity, pulse characteristics, burst characteristics, pattern matching, etc. are used in the analysis of events.

Patent Document 3 discloses a technique for identifying interference that requires dynamic frequency selection without erroneous detection.

In the technique disclosed in Patent Document 3, the received signal strengths are compared by a threshold circuit, and when the threshold is exceeded, "1" is set in the bit stream, and such a bit stream is defined as a radar signal signature. The presence of the radar signal is determined by comparison with.

Japanese Unexamined Patent Publication No. 2007-171164 Japanese Unexamined Patent Publication No. 2005-512436 Japanese Unexamined Patent Publication No. 2014-155225

With the recent spread of wireless LAN, the number of wireless communication systems having a DFS function is increasing, and wireless interference between the relevant wireless communication systems is also occurring. If a non-radar signal used in a wireless LAN is erroneously detected as a specified radar signal, the DFS function must stop the emission of radio waves and change the channel used, and the wireless communication operating rate. Will be reduced.

Therefore, in a wireless communication system having a DFS function, it is required to accurately and easily determine a non-radar signal without erroneously detecting it as a specified radar signal. The techniques disclosed in Patent Document 1 and Patent Document 2 require analysis using a predetermined algorithm, and have a drawback in terms of simplicity. Further, in the technique disclosed in Patent Document 3, although the processing is simple, there is a difficulty in the accuracy of determination.

Further, in a wireless communication system having a DFS function, the system form uses various antennas suitable for the wireless communication system. For example, an omni-antenna is used to form a communicable area (cell), a sector antenna is used to restrict the directionality of the communicable area, or an extremely directional antenna (for example, a parabolic antenna). There is a form of configuring long-distance transmission using.

Therefore, a wireless device in a wireless communication system having a DFS function is required to detect a specified radar signal with a specified radar threshold even when operating in an environment using antennas with various receiving antenna gains. .. In the techniques disclosed in Patent Documents 1 to 3, it is not considered to operate a wireless device in a wireless communication system having a DFS function in an environment using antennas having various receiving antenna gains.

INDUSTRIAL APPLICABILITY The present invention can accurately and easily determine whether or not the DFS function needs to be applied without erroneously detecting a non-radar signal as a specified radar signal even in an environment where antennas having various receiving antenna gains are applied. It provides a wireless device and a radar detection method.

In order to realize the above object, the radio device according to one embodiment of the present invention corrects and converts the signal level of the radio signal received by the antenna by the receiving antenna gain of the antenna, and corrects and converts the received signal in the corrected and converted radio space. Corrected received signal level indicating the level Corrected received signal level correction conversion means that outputs the data series, radar information including the characteristic points of the radar pulse of the radar wave that is the target of DFS (dynamic frequency selection) control, and DFS control. A memory storage cycle signal having a predetermined cycle generated by storing the radar threshold level indicating the received signal level of the radar wave in the radio space, which is the threshold to be activated, and the cycle of the memory storage cycle signal. Radar information setting means for outputting radar judgment information including a radar mask indicating a radar mask indicating a radar pulse signal pattern corresponding to the radar information generated using the radar and the radar threshold level, and the received signal level correction conversion means for outputting the radar information A sample data storage means that samples the data series of the corrected reception signal level in the cycle of the memory storage cycle signal output by the radar information setting means and stores the corrected reception signal level as sample data in the memory in the cycle. Match comparison between the signal pattern indicated by the data series of the sample data read from the sample data storage means and the radar mask corresponding to the radar information, and comparison between the corrected received signal level and the radar threshold level are performed. Then, when the radar wave determination means for determining the presence or absence of the radar wave subject to DFS control and the radar wave determination means detect the existence of the radar wave subject to DFS control, DFS control is started. It is characterized by including a DFS control activation means.

Further, the radar detection method according to another embodiment of the present invention includes radar information including the received antenna gain of the antenna, the characteristic points of the radar pulse of the radar wave to be controlled by DFS (dynamic frequency selection), and DFS control. The radar threshold level indicating the received signal level of the radar wave in the radio space, which is the threshold for activating the radar wave, is stored in advance, the signal level of the radio signal received by the antenna is corrected and converted by the received antenna gain, and the correction conversion is performed. A data series of corrected received signal levels indicating the received signal level in the wireless space is output, a memory storage cycle signal having a predetermined cycle is generated using the radar information, and the radar using the cycle of the memory storage cycle signal. A radar mask showing the signal pattern of the radar pulse corresponding to the information is generated, the data series of the corrected received signal level is sampled in the cycle of the memory storage cycle signal, and the corrected received signal level is used as sample data in the cycle. Match comparison between the signal pattern indicated by the data series of the sample data stored in the memory and the radar mask corresponding to the radar information, and comparison between the corrected received signal level and the radar threshold level. Is performed to determine the presence or absence of a radar wave subject to DFS control, and when the presence of a radar wave subject to DFS control is detected in the determination, DFS control is started. ..

INDUSTRIAL APPLICABILITY The present invention can accurately and easily determine whether or not the DFS function needs to be applied without erroneously detecting a non-radar signal as a specified radar signal even in an environment where antennas having various receiving antenna gains are applied. ..

It is a block diagram which illustrates the structure of the radio apparatus of 1st Embodiment of this invention. It is a flow diagram which illustrates the operation of the wireless apparatus of 1st Embodiment of this invention. It is a block diagram which illustrates the structure of the radio apparatus of the 2nd Embodiment of this invention. It is a figure explaining the outline of the received signal level correction conversion. It is a figure which shows the time domain of the characteristic point of a radar pulse. It is a figure explaining the radar mask. It is a block diagram which illustrates the structure of the extraction comparison determination unit and the reception signal level determination unit. It is a flow diagram which illustrates the operation of the radio apparatus of the 2nd Embodiment of this invention. It is a flow diagram which illustrates the operation of the comparison determination processing. It is a figure explaining the comparison judgment process with a radar mask, and the increment of a sample data. It is a figure which shows the state which detected the pattern matching of a sample data and a radar mask n. It is a figure explaining the outline of the determination of the radio space reception level and the radar threshold value converted by correction.

The embodiment for carrying out the present invention will be described in detail below with reference to the drawings.

It should be noted that the embodiments are exemplary, and the disclosed devices and methods are not limited to the configurations of the following embodiments. Further, the reference numerals attached to the figures are added for convenience as an example to help understanding, and are not intended to be limited in any way. Further, the direction of the arrow in the drawing shows an example and does not limit the direction of the signal between the blocks.

(First Embodiment)
The first embodiment will be described with reference to FIGS. 1 and 2.

FIG. 1 is a block diagram illustrating the configuration of the wireless device 1 according to the first embodiment of the present invention.

The wireless device 1 includes an antenna 11, a received signal level correction conversion means 12, a radar information setting means 13, a sample data storage means 14, a radar wave determination means 15, and a DFS (dynamic frequency selection) control activation means 16. ing.

The received signal level correction conversion means 12 corrects and converts the signal level of the radio signal received by the antenna 11 by the receiving antenna gain of the antenna 11, and corrects and converts the received signal level data indicating the received signal level in the corrected and converted radio space. Output the series.

The radar information setting means 13 determines the radar information including the characteristic points of the radar pulse of the radar wave to be controlled by DFS and the radar threshold level indicating the received signal level of the radar wave which is the threshold for activating DFS control in the radio space. Store. The radar information setting means 13 uses radar information to generate a memory storage cycle signal having a predetermined cycle and a radar mask showing a signal pattern of a radar pulse corresponding to the radar information using the cycle of the memory storage cycle signal. .. Then, the radar information setting means 13 outputs radar determination information including a memory storage cycle signal, a radar mask, and a radar threshold level.

The sample data storage means 14 samples the data series of the correction reception signal level output by the reception signal level correction conversion means 12 in the cycle of the memory storage cycle signal output by the radar information setting means 13. Then, the sample data storage means 14 stores the corrected reception signal level as sample data in the memory in the cycle.

The radar wave determination means 15 performs a match comparison between the signal pattern indicated by the data series of the sample data read from the sample data storage means 14 and the radar mask corresponding to the radar information. Further, the radar wave determination means 15 compares the corrected reception signal level with the radar threshold level to determine the presence or absence of the radar wave to be controlled by DFS.

The DFS control starting means 16 starts DFS control when the radar wave determining means 15 detects the existence of a radar wave to be controlled by DFS.

FIG. 2 is a flow chart illustrating the operation of the wireless device 1 according to the first embodiment of the present invention. The radar detection method of the first embodiment is realized by operating the wireless device 1 of the first embodiment as shown in FIG.

In step S101, various information necessary for radar detection is preset.

The following information is stored in advance as preset information.
-Received antenna gain of the antenna.
-Radar information including the characteristic points of the radar pulse of the radar wave to be controlled by DFS (Dynamic Frequency Selection).
-Radar threshold level indicating the received signal level in the radio space of the radar wave that is the threshold for activating DFS control.

In step S102, the received signal level is converted.

In this process, the signal level of the radio signal received by the antenna is corrected and converted by the receiving antenna gain, and a data series of the corrected received signal level indicating the received signal level in the corrected and converted radio space is output.

In step S103, the memory storage cycle signal and the radar mask are generated.

This process uses radar information to generate a memory storage cycle signal having a predetermined cycle, and uses the cycle of the memory storage cycle signal to generate a radar mask showing a signal pattern of a radar pulse corresponding to the radar information.

In step S104, sample data storage processing is performed.

In this process, the data series of the corrected received signal level is sampled in the cycle of the memory storage cycle signal, and the corrected received signal level is stored in the memory as sample data in the cycle.

In step S105, a match comparison between the sample data and the radar mask and a signal level comparison with the radar threshold level are performed.

This process performs a match comparison between the signal pattern indicated by the data series of the sample data read from the memory and the radar mask corresponding to the radar information. Further, the presence or absence of the radar wave to be controlled by DFS is determined by comparing the corrected received signal level with the radar threshold level.

In step S106, when the presence of the radar wave subject to DFS control is detected in the determination, DFS control is started.

As described above, in the present embodiment, the signal level of the radio signal received by the antenna is corrected and converted by the receiving antenna gain of the antenna, and is based on the data series of the corrected received signal level indicating the received signal level in the corrected and converted radio space. Take control. Therefore, common processing can be performed without depending on the type of the receiving antenna used in the wireless device.

Further, a memory storage cycle signal having a predetermined cycle is generated based on the radar information including the characteristic points of the radar pulse of the radar wave. Using this memory storage cycle signal cycle, sampling is performed for the data series of the corrected reception signal level, and a radar mask showing the signal pattern is generated for the radar information. As a result, the sample data and the radar mask can be synchronized, and the matching comparison between the sample data and the radar mask can be performed accurately and easily.

Therefore, in the present embodiment, even in an environment where antennas having various receiving antenna gains are applied, it is possible to accurately and easily determine whether or not the DFS function needs to be applied without erroneously detecting a non-radar signal as a specified radar signal. be able to.

(Second embodiment)
Next, a second embodiment will be described.

The wireless device of this embodiment assumes a wireless LAN device equipped with a DFS (dynamic frequency selection) function.

[Description of configuration]
FIG. 3 is a block diagram illustrating the configuration of the wireless device 2 according to the second embodiment of the present invention.

The wireless device 2 includes an antenna 21, a received signal level correction conversion unit 22, a radar information setting unit 23, a sample data storage unit 24, a radar wave determination unit 25, and a DFS control activation unit 26.

The received signal level correction conversion unit 22 corresponds to the reception signal level correction conversion unit 12 of the wireless device 1 of the first embodiment, and includes a reception setting unit 221 and a correction conversion unit 222.

As the antenna 21 of the wireless device 2, various antennas are used properly according to the usage pattern of the wireless device 2. The form includes, for example, a form in which an omni-antenna is used to form a communicable area (cell), a form in which a sector antenna is used to restrict the directionality of the communicable area, and an antenna having extremely high directivity. There is a form in which long-distance transmission is configured by using (for example, a parabolic antenna). Each antenna has a fixed gain (signal amplification value) as the receiving antenna gain, and a fixed gain (xdBi in absolute gain) is amplified and received with respect to the radio reception signal from the opposite station. ..

On the other hand, the threshold value of the signal level detected as a radar wave is defined by the signal level received by the antenna having an absolute gain of 0 dBi. Therefore, depending on the antenna used in the wireless device 2, it is necessary to correct the antenna received signal level with the fixed gain of the antenna and convert it to the received signal level in the wireless space.

The reception setting unit 221 stores the fixed gain (xdbi) of each antenna as a correction value in consideration of the types of antennas that can be used in the wireless device 2, and the correction value of the fixed gain corresponding to the antenna to be used. Switch to and set. This correction value switching setting may be changed by access from the outside.

The correction conversion unit 222 subtracts the fixed gain (xdBi) of the antenna, which is the correction value set in the reception setting unit 221, from the antenna reception signal level (ydBm) received by the antenna 21 of the wireless device 2 (y-). x) and convert it to the received signal level in the wireless space.

FIG. 4 is shown as a diagram illustrating the outline of the above-mentioned received signal level correction conversion.

FIG. 4A shows the antenna reception signal level received by the antenna 21 of the wireless device 2. Then, FIG. 4B shows an image of the received signal level in the wireless space converted by subtracting the fixed gain of the antenna, which is the correction value set in the reception setting unit 221, from the antenna received signal level. Although the images before and after the antenna gain correction are displayed in analog in FIG. 4, the correction conversion unit 222 processes the digital data after the analog / digital conversion.

Returning to FIG. 3, the description of the configuration of the wireless device 2 will be continued.

The radar information setting unit 23 corresponds to the radar information setting unit 13 of the wireless device 1 of the first embodiment, and includes a radar setting unit 231, a sample cycle generation unit 232, and a radar determination information generation unit 233.

The radar setting unit 231 stores information about the radar signal to be detected by the wireless device 2 as a set value.

The information about the radar signal is the pulse width (Pw), the pulse repetition frequency (PRF) or the pulse repetition interval (PRI), which are the characteristic points of the radar pulse for distinguishing the target radar, and the number of continuous pulses (Pn). ), It is a repetition period (Tcycle).

Further, the radar setting unit 231 also sets in advance a radar threshold level (Rx-th) indicating a received signal level in the radio space of the radar wave which is a threshold for activating DFS control.

When there are a plurality of target radars, all the set values for each radar type are stored in the radar setting unit 231. By storing the set values of a plurality of radar types, it is possible to simultaneously determine the matching of the characteristic points of the radar pulse for all the radars.

FIG. 5 is a diagram showing the time domain of the feature points of the radar pulse.

The pulse width (Pw) of a radar pulse is the duration of the radar pulse. The pulse repetition interval (PRI) is the time interval from the start of one radar pulse to the next radar pulse, which is the inverse of the pulse repetition frequency (PRF), which is the number of radar pulses transmitted per second. be equivalent to. That is, the radar pulse is configured by repeating the operation of continuously radiating the radar signal for the pulse width (Pw) and stopping the radiation for the duration of (PRI-Pw). The number of consecutive pulses (Pn) is the number of pulses that are continuously repeated at the pulse repetition interval (PRI). The repetition period (Tcycle) is the time from the start of a series of continuously repeated pulse groups in PRI to the next pulse group.

For example, in a radio device that uses the 5.6 GHz band in Japan, the characteristics of radar pulses are defined for fixed pulse radars of types 1 to 3, variable pulse radars of types 4 to 6, other chirp radars, and frequency hopping radars. There is. Then, it is required as a technical standard to detect radar waves with a predetermined detection probability for these (Reference: Radio Law Appendix 45 Certification Regulations Article 2, Paragraph 1, Item 19-3 and No. Test method for radio equipment listed in No. 19-3-2).

For example, in the case of a fixed pulse radar, a pulse width Pw = 1 μsec, a pulse repetition frequency PRF = 700 Hz, a number of continuous pulses Pn = 18, and a repetition period Tcycle = 15 seconds are specified. Further, a fixed pulse radar having a pulse width of Pw = 2.5 μsec, a pulse repetition frequency of PRF = 260 Hz, a number of continuous pulses Pn = 18, and a repetition period of Tcycle = 15 seconds is also specified. Further, the detection probability of the radar wave is, for example, 60% or more for the fixed pulse radar and the variable pulse radar, 80% or more for the chirp radar, and 70% or more for the frequency hopping radar. This detection probability standard uses the detection capability when a radar wave exceeding the radar threshold level (Rx-th), which indicates the received signal level of the radar wave in the radio space, is received for each radar as the detection probability. It is specified.

Furthermore, even if the target radar type is different for each operating area (for example, Japan, North America, EU), all the characteristic points of the radar pulse of those radar waves can be stored in the radar setting unit 231. , Radar detection suitable for the operating area becomes possible.

The application change of the plurality of setting values stored in the radar setting unit 231 may be changed by access from the outside. Further, the radar setting unit 231 may be configured to acquire the position information, determine the area where the wireless device is operated based on the position information, and switch the set value to be applied accordingly. With this configuration, it is possible to realize a wireless device that can be applied to a plurality of operating areas in which radar detection determination is common.

Returning to FIG. 3, the sample cycle generation unit 232 has a memory storage cycle signal (a) of the Tsamp cycle for sampling the received signal level corrected and converted to the signal level in the wireless space by the received signal level correction conversion unit 22. To generate. Hereinafter, the received signal level corrected and converted into the signal level in the wireless space by the received signal level correction conversion unit 22 will be referred to as a corrected reception signal level.

As will be described later, the wireless device 2 of the present embodiment is configured to perform radar determination using a common processing circuit and a common memory for a plurality of radars to be controlled by DFS. On the other hand, the corrected reception signal level output from the received signal level correction conversion unit 22 is a data series in which the clock reproduced from the analog signal when converting the analog signal received by the antenna into a digital signal is used as a unit. ..

Therefore, for the purpose of facilitating processing and reducing the memory capacity, the data series of the corrected reception signal level including the characteristic points of the radar pulse of the radar wave to be detected is stored in the memory storage cycle signal (a) of the Tsamp cycle. It is configured to use the sample data thinned out in.

The sample cycle generation unit 232 is a memory for sampling the data series of the corrected reception signal level in the Tsamp cycle based on the feature points of the radar pulse of the radar wave to be controlled by DFS set in the radar setting unit 231. The storage cycle signal (a) is generated.

When the feature points of the radar pulses of a plurality of radar waves are set, the memory storage cycle signal (a) having a unique Tsamp cycle is generated by the feature points of the radar pulses of the plurality of radar waves.

The Tsamp cycle of the memory storage cycle signal (a) is the cycle of the shorter of the following two time intervals based on the feature points of the plurality of radar pulses set in the radar setting unit 231. Generated. One is a time interval (Tsamp <Pw / 2) shorter than half the time of the shortest pulse width (Pw) among the feature points of a plurality of radar pulses, and the other is a feature point of a plurality of radar pulses. The time interval is shorter than half of the time of the shortest radar emission stop width (PRI-Pw) (Tsamp <(PRI-Pw) / 2).

In other words, the memory storage period signal (a) is a periodic signal that can be sampled more than once for a shorter time width of the minimum pulse width of the radar pulse of a plurality of radar waves and the minimum time width of the radar radiation stop time. Is generated as. This is because when the corrected received signal level including the characteristic points of the radar pulse of a plurality of radar waves is sampled, the characteristic points of the radar pulse of each radar wave are reproduced in the data series of the sampled corrected received signal level. This is to ensure that you are there. For example, when the Tsamp period is 1/10 of the time width of one pulse of the radar wave, the equivalent of one pulse of this radar wave is a pulse shape with a width of 9 × Tsamp or 11 × Tsamp, considering the error. Obtained as sample data.

The memory storage cycle signal (a) generated by the sample cycle generation unit 232 is supplied to the sample data storage unit 24 and the radar determination information generation unit 233.

The radar determination information generation unit 233 outputs a radar mask (b) and a radar threshold level (c) as radar determination information.

The radar mask (b) is supplied to the extraction comparison determination unit 251 of the radar wave determination unit 25, which will be described later, and is used for determining the matching of the radar wave signal pattern included in the data series of the sample data of the corrected reception signal level. Further, the radar threshold level (c) is supplied to the received signal level determination unit 252 of the radar wave determination unit 25 described later, and whether or not the corrected received signal level of the radar wave matching the signal pattern exceeds the specified value. Used for judgment.

As the radar threshold level (c), the radar threshold level (Rx-th) indicating the received signal level in the radio space of the radar wave, which is preset in the radar setting unit 231 and serves as the threshold for activating DFS control, is used. ..

The radar mask (b) includes the feature points (Pw, PRF or PRI, Pn, Tcycle) of the radar pulse of the radar wave set in the radar setting unit 231 and the memory storage cycle signal (Pw, PRF or PRI, Pn, Tcycle) generated by the sample cycle generation unit 232. It is generated based on the Tsamp period of a). When information on a plurality of radar types is set, the radar mask is generated as mask data indicating the signal pattern of each radar wave, corresponding to the feature points of the radar pulse of each radar wave.

The radar determination information generation unit 233 samples the time domain information of the characteristic points of the radar pulse of the radar wave set in the radar setting unit 231 in the Tsamp period generated by the sample cycle generation unit 232, and the radar mask (b). To generate.

FIG. 6 is a diagram illustrating a radar mask.

The sample data shown at the top of FIG. 6 shows an example of the above-mentioned sampled corrected received signal level data series. Further, in FIG. 6, n types of radar masks corresponding to each set radar are generated.

By sampling the time domain information of the feature points of the radar pulse of each radar wave in a single Tsamp cycle, each radar mask is synchronized with the data series of the corrected received signal level sampled in the same Tsamp cycle. Further, each radar mask is series data having a repetition period corresponding to the repetition period (Tcycle) of the feature points of the radar pulse of the corresponding radar wave.

Returning to FIG. 3, the sample data storage unit 24 corresponds to the sample data storage unit 14 of the wireless device 1 of the first embodiment, and includes a memory 241 and a storage control unit 242.

The memory 241 is a storage means for storing individual data of the sampled corrected received signal level.

The storage control unit 242 samples the data series of the corrected reception signal level output from the reception signal level correction conversion unit 22 at the timing (Tsamp cycle) of the memory storage cycle signal (a) output by the sample cycle generation unit 232. And store it in the memory 241.

That is, the memory 241 stores individual data of the corrected reception signal level sampled in the Tsamp cycle for each address.

The radar wave determination unit 25 corresponds to the radar wave determination unit 15 of the radio device 1 of the first embodiment, and includes an extraction comparison determination unit 251 and a received signal level determination unit 252.

The extraction comparison determination unit 251 displays the signal pattern indicated by the radar mask (b) output by the radar determination information generation unit 233 and the signal pattern indicated by the data series of the sample data of the corrected reception signal level read from the sample data storage unit 24. Compare and judge.

In FIG. 6, the pulse-shaped portion shown in the data series of the sample data indicates a state in which the received signal level is detected, and the portion without the pulse-shaped display indicates a state in which the received signal level cannot be detected. Then, the signal pattern indicated by the sample data data sequence is matched and compared with the signal pattern indicated by each radar mask (b), and the radar wave included in the sample data data sequence of the corrected received signal level is extracted. This signal pattern matching comparison is performed individually and simultaneously for each radar mask.

The reception signal level determination unit 252 converts the data series of the sample data extracted by the extraction comparison determination unit 251 into the data series of the corresponding corrected reception signal level before sampling. Then, it is determined whether or not the predetermined signal level of the radar wave included in the data series of the corrected received signal level exceeds the radar threshold level (c) output by the radar determination information generation unit 233.

For example, the radar threshold level (Rx-th) indicating the received signal level in the radio space of the radar wave, which is the threshold for activating DFS control, is defined as follows in Japan.

When the maximum equivalent radiated power of the wireless device is less than 0.2 W, the threshold value of the average power per 1 μsec received by the antenna having an absolute gain of 0 dBi is −62 dBm. When the maximum equivalent radiated power of the wireless device is 0.2 W or more, the threshold value is −64 dBm. Then, when a value equal to or greater than the threshold value is detected, it is determined that a radar wave exists.

The above-mentioned radar wave determination unit 25 extracts the radar wave and compares it with the threshold value of the received signal level. It is determined that the radar wave is detected when the predetermined protection condition is satisfied without processing by one determination. You just have to do it. Further, this protection condition may be different for each type of radar. By setting such protection conditions, erroneous detection can be prevented.

The DFS control activation unit 26 corresponds to the DFS control activation means 16 of the wireless device 1 of the first embodiment, and the received signal level determination unit 252 of the radar wave determination unit 25 determines the existence of a radar wave to be controlled by DFS. When it is detected, DFS control is started.

FIG. 7 is a block diagram illustrating the configuration of the extraction comparison determination unit 251 and the received signal level determination unit 252 of the radar wave determination unit 25 described above.

The extraction comparison determination unit 251 includes a pattern comparison circuit 2511 that compares the sample data with the signal pattern of the radar mask (b), and an increment control circuit 2512 that controls the increment described later.

Further, the received signal level determination unit 252 is configured to include a match determination circuit 2521 and a signal level determination circuit 2522.

The pattern comparison circuit 2511 is provided corresponding to the radar mask (b) to be compared. In FIG. 7, it corresponds to the radar masks (b) of 1 to n.

Common sample data read from the sample data storage unit 24 shown in FIG. 3 in the Tsamp cycle and each radar mask (b) output by the radar determination information generation unit 233 are input to each pattern comparison circuit 2511. ..

The radar mask (b) has a sequence length corresponding to the radar repetition period (Tcycle) of the feature point of the corresponding radar pulse. Therefore, in each pattern comparison circuit 2511, sample data having at least a sequence length that can be compared with a radar mask having the maximum sequence length among the radars to be compared is input.

The pattern comparison circuit 2511 performs matching comparison between the input sample data and the signal pattern of the radar mask (b), and outputs the comparison result (radar mask comparison result).

The matching determination circuit 2521 inputs the radar mask comparison result output by each pattern comparison circuit 2511, and determines the matching status of the sample data and the signal pattern of the radar mask (b).

If none of the radar masks (b) is matched, the match determination circuit 2521 outputs an increment A = 0, which is a signal instructing the increment, to the increment control circuit 2512, and immediately instructs the start of the increment. In this case, the match determination circuit 2521 does not output any sample data to the signal level determination circuit 2522.

Further, when the match is matched with any one of the radar masks, the match determination circuit 2521 outputs the increment A = 1 to the increment control circuit 2512 and instructs the increment control circuit 2512 to stop the increment. Then, the match determination circuit 2521 outputs the sample data that matches the radar mask to the signal level determination circuit 2522.

The increment will be described later.

The signal level determination circuit 2522 converts the sample data input from the match determination circuit 2521 into the corresponding corrected reception signal level before sampling, and the corrected reception signal level is the radar threshold level input from the radar determination information generation unit 233. It is determined whether or not (c) is exceeded. In this case, the determination is made as shown in FIG. 12, which will be described later.

When the signal level determination circuit 2522 determines that the radar threshold level (c) has been exceeded, the signal level determination circuit 2522 outputs a radar determination result (d): 1 indicating that fact to the DFS control activation unit 26 shown in FIG. It should be noted that the case where it is determined that the radar threshold level (c) is exceeded is the case of (B) in FIG. 12, which will be described later, and when the determination protection condition is attached, the determination protection condition is satisfied. Corresponds to the case.

If the signal level determination circuit 2522 determines that the radar threshold level (c) is not exceeded, it outputs increment B = 0, which is a signal instructing increment, to the increment control circuit 2512, and immediately starts incrementing. To instruct. The case where it is determined that the radar threshold level (c) is not exceeded is the case of (A) of FIG. 12, which will be described later, or the case of (B) of FIG. 12 when the determination protection condition is attached. However, it corresponds to the case where the judgment protection condition is not satisfied.

The increment control circuit 2512 executes the increment process based on the content of the increment A or the increment B, which is a signal instructing the increment.

Upon receiving increment A = 0 or increment B = 0, the increment control circuit 2512 increments the address to be compared with the sample data to be compared with the radar mask (b) in each pattern comparison circuit 2511 by one (that is, 1 Tsamp). do. Here, incrementing the address by one means controlling the radar masks (b) of 1 to n to be compared with the sample data shifted by one address in synchronization as shown in FIG. 10 described later. means.

When the increment A = 1 is received, the signal level determination circuit 2522 shifts to the comparison determination with the radar threshold level (c), so that the increment control circuit 2512 prevents the sample data from being incremented.

When the increment B = 1 is received, it means that the re-judgment based on the judgment protection condition is executed, and the increment control circuit 2512 shifts the sample data for a predetermined address and compares it with a new sample data series. To be able to do it.

The details of the increment will be described later with reference to FIG.

[Explanation of operation]
The operation of the wireless device 2 of the present embodiment configured as described above will be described with reference to FIGS. 8 to 12.

FIG. 8 is a flow chart illustrating the operation of the wireless device 2 according to the second embodiment of the present invention. The radar detection method of the second embodiment is realized by operating the wireless device 2 as shown in FIG.

First, the reception setting (S201) for setting the receive antenna gain (fixed gain) of the antenna as a correction value, and the radar setting (S202) for setting the radar pulse of the radar wave to be detected and the threshold level. Make settings.

In the reception setting (S201), the fixed gain (xdBi) of the antenna used for signal reception is set.

In the radar setting (S202), radar information (Pw, PRF or PRI, Pn, Tcycle) indicating the characteristic points of the radar pulse for discriminating the radar and a radar threshold level (Pw, PRF or PRI, Pn, Tcycle) indicating a signal level as a threshold for activating DFS control ( Rx-th) is set. When there are a plurality of radars to be controlled by DFS, all radar information and radar threshold levels for each radar type are set.

The received radio signal is amplified and controlled at an analog signal level to a predetermined signal level, and is generated as time-series digital data in clock units obtained by clock reproduction from the analog signal during analog / digital conversion. With this clock as a reference, the received signal level detected by the amplification control value to the predetermined signal level is input as a time-series digital data value (S203).

Since the threshold value of the signal level detected as a radar wave is defined by the signal level received by the antenna having an absolute gain of 0 dBi, the fixed gain of the antenna to be used is corrected and converted into the received signal level in the radio space ( S204).

Here, the fixed gain (xdBi) of the antenna, which is the correction value set for reception in step S201, is subtracted (yx) from the received signal level (ydBm) of the time-series digital data input in step S203. , Convert to the received signal level in wireless space.

That is, in step S204, the corrected received signal level corrected and converted to the received signal level in the wireless space is output as time-series digital data in the clock unit. The corrected received signal level data sequence includes radar waves that are subject to DFS control.

Next, the process of extracting the radar wave to be DFS controlled from the data series of the corrected received signal level output in the process of step S204 is started.

First, a memory storage cycle signal (a) for storing sample data obtained by thinning out a data series of corrected reception signal levels in a predetermined cycle (Tsamp cycle) is generated (S205).

The Tsamp period of the memory storage cycle signal (a) is generated as the cycle of the shorter of the following two time intervals based on the feature points of the plurality of radar pulses set in step S202. One is a time interval (Tsamp <Pw / 2) shorter than half the time of the shortest pulse width (Pw) among the feature points of a plurality of radar pulses, and the other is a feature point of a plurality of radar pulses. The time interval is shorter than half of the time of the shortest radar emission stop width (PRI-Pw) (Tsamp <(PRI-Pw) / 2).

In other words, the memory storage period signal (a) is a periodic signal that can be sampled more than once for a shorter time width of the minimum pulse width of the radar pulse of a plurality of radar waves and the minimum time width of the radar radiation stop time. Is generated as.

That is, even if the data series of the corrected reception signal level is sampled, the characteristic points of the radar pulse included in the data series of the corrected reception signal level are not lost from the data series of the sampled data. Set to. The finer the Tsamp, the higher the reproducibility of the radar pulse feature points, but there is a trade-off that the memory area (number of addresses) for storing sample data increases.

Then, the data series of the corrected reception signal level output in the process of step S204 is sampled in the Tsamp cycle of the memory storage cycle signal (a) and stored for each address of the memory (S206).

Subsequently, the characteristic point of the radar pulse of the radar wave is based on the radar information (Pw, PRF or PRI, Pn, Tcycle) set in step S202 and the Tsamp period of the memory storage cycle signal (a) generated in step S205. A radar mask (b) indicating the above is generated (S207). When a plurality of radar information is set, a plurality of radar masks (b) indicating the feature points of the radar pulse of each radar wave are generated corresponding to each radar information.

The radar mask (b) is generated as sequence data obtained by sampling the time domain information of the characteristic points (Pw, PRF or PRI, Pn, Tcycle) of the radar pulse in the Tsamp period. By sampling the time domain information of the feature points of the radar pulse of each radar wave in a common Tsamp cycle, each radar mask (b) is synchronized with the data series of the sample data in which the corrected received signal level is sampled. Further, the series length of each radar mask (b) has a different length depending on the repetition period (Tcycle) of the corresponding radar.

The radar mask (b) is used for comparison determination with the signal pattern of the radar wave included in the data series of the sample data of the corrected received signal level.

Further, the radar threshold level (Rx-th) indicating the signal level that becomes the threshold for activating the DFS control set in step S202 is output as the radar threshold level (c) (S208).

The comparison determination between the sample data and the radar mask (b) is performed by matching comparison between the signal pattern indicated by the data series of the sample data and the signal pattern indicated by the radar mask (b) (S209). When there are a plurality of radar masks (b), the determination is performed by matching comparison at the same time.

The comparison between the sample data and the radar mask (b) is performed from the respective head address data, and the comparison is made within the range of the series length of the repetition period (Tcycle) of the radar mask (b) to be compared. Therefore, the final address of the comparison differs depending on the repetition period (Tcycle) of each radar mask (b).

The comparison result between the sample data and the radar mask (b) is transmitted to step S210 of the next process as a radar mask comparison result (1, 2, ... n).

If the plurality of radar mask comparison results (1, 2, ... n) do not match, the increment A = 0, which is a signal instructing the increment of the sample data, is output in step S210. When the increment A = 0 is output, the data increment process is performed (S211), and the comparison determination in step S209 is continued with respect to the incremented sample data.

On the other hand, if it matches any one of the radar masks, the increment A = 1 is output in step S210, and the reception level is determined for the sample data that matches the radar mask. The increment A = 1 output here is used as a signal instructing the stop of the data increment process.

Even when the match between the sample data and any of the radar masks is determined, if the corrected received signal level is less than the radar threshold level (c), the increment B instructing the increment of the sample data in step S210. = 0 is output.

When the increment B = 0 is output, the data increment process is performed (S211) in the same manner as when the increment A = 0 is output, and the comparison determination in step S209 is continued with respect to the incremented sample data. ..

On the other hand, if the match between the sample data and any of the radar masks is determined and the corrected received signal level is equal to or higher than the radar threshold level (c), the radar determination result (d): 1 is output in step S210.

When the judgment protection condition is attached, when it is judged that the corrected reception signal level is equal to or higher than the radar threshold level (c), the increment B = instructing the increment of the sample data in order to perform the judgment again. 1 is output. By increment B = 1, a process of shifting the sample data by a predetermined address is performed so that the comparison with a new sample data series can be performed. The comparison determination in step S209 is continued for the new sample data series. Then, when the determination protection condition is satisfied and the corrected reception signal level is determined to be equal to or higher than the radar threshold level (c), the radar determination result (d): 1 is output.

When the radar determination result (d): 1 is output, DFS control is activated (S212), and the frequency channel to be used is changed. After changing the frequency channel used in DFS control, the comparison determination process for the changed frequency channel is restarted again.

The operation of the comparison determination process in steps S209 to S211 described above will be described in detail with reference to FIGS. 9 to 12.

FIG. 9 is a flow chart illustrating the operation of the comparison determination process.

FIG. 10 is a diagram illustrating comparison determination processing with a radar mask and increment of sample data.

FIG. 11 is a diagram showing a state in which a pattern match between the sample data and the radar mask n is detected.

FIG. 12 is a diagram illustrating an outline of determination between the correction-converted radio space reception level and the radar threshold level.

The operation flow of the comparison determination process will be described with reference to FIG. 9.

In the operation of the comparison determination process, in step S301, the sample data and the radar mask (b) are input, and the matching comparison between the signal pattern shown by the sample data and the signal pattern shown by the radar mask (b) is performed. That is, it is compared whether or not the sample data includes the signal pattern corresponding to the radar mask (b).

In the process of step S301, the signal pattern shown by the sample data of the predetermined sequence length read from the sample data storage unit 24 shown in FIG. 3 is simultaneously compared with the signal pattern shown by each radar mask (b). Will be done. Since the series length of the radar mask (b) has a length corresponding to the repetition period (Tcycle) of the corresponding radar, the data series of sample data comparable to the radar mask (b) having the maximum series length can be read. It is assumed that it has been issued.

For example, referring to FIGS. 6 and 10, since the radar n has the maximum repetition period (Tcycle) among the radars 1 to n, at least a sample data series having the number of data corresponding to the repetition period of the radar n is read out. There is. Then, the signal pattern indicated by the range of the sequence length of each radar mask (b) in this sample data sequence is compared with the signal pattern indicated by the radar mask (b).

Next, the matching comparison result of the signal pattern with the sample data for each radar mask (b) described above is output (S302).

Matching of signal pattern with sample data for each radar mask (b) It is determined whether or not the signal pattern of at least one radar mask (b) and sample data matches in the comparison result (S303).

If no match is determined with any of the radar masks (b) in the determination in step S303 (S303, No), the increment A = 0, which is a signal instructing the increment of the sample data, is output (S304).

When the increment A = 0 is output, in step S309, the address of the sample data to be compared with the radar mask (b) is incremented by one, and the process returns to step S301 to make a comparison judgment with respect to the incremented sample data. Will be continued. Therefore, in the process returned to step S301, the incremented sample data series is compared and determined with the radar mask (b). As described above, incrementing the address by one means controlling so as to compare the sample data series shifted by one address with the radar mask (b). Further, one address means one memory portion of the sample data stored in the memory 241 of the sample data storage unit 24 in the Tsamp cycle of the memory storage cycle signal (a).

On the other hand, if the determination in step S303 determines that the radar mask (b) matches at least one (S303, Yes), the corrected reception signal level and the radar threshold value corresponding to the sample data that matches the radar mask (b). Comparison with level (c) is performed (S305). When a match with at least one radar mask (b) is determined, an increment A = 1 is output and the sample data increment process is stopped, although not shown. Further, a comparison between the corrected received signal level corresponding to the sample data matching the radar mask (b) and the radar threshold level (c) will be described later with reference to FIG.

In the comparison in step S305, it is determined whether or not the corrected reception signal level corresponding to the sample data is equal to or higher than the radar threshold level (S306).

If it is determined in step S306 that the corrected reception signal level corresponding to the sample data is equal to or higher than the radar threshold level (S306, Yes), the radar determination result (d): 1 is output (S308).

On the other hand, when it is determined in step S306 that the corrected reception signal level corresponding to the sample data is less than the radar threshold level (S306, No), the increment B = 0, which is a signal instructing the increment of the sample data, is output. (S307).

When the increment B = 0 is output, the process of incrementing the address of the sample data to be compared with the radar mask (b) by one is performed in step S309 in the same manner as when the increment A = 0 is output. Then, the process returns to step S301, and the comparison determination with respect to the incremented sample data is continued.

Although not shown, when the determination protection condition is attached, when the correction reception signal level is determined to be equal to or higher than the radar threshold level in the determination in step S306, the determination of the number of times according to the protection condition is performed again. It may work as it does. In this case, the increment B = 1 instructing the increment of the sample data may be output, and the sample data for a predetermined address may be shifted so that the sample data can be compared with the new sample data series. When the comparison determination from step S301 is continued for the new sample data series and the corrected received signal level is determined to be equal to or higher than the radar threshold level (c) by satisfying the number of times according to the protection conditions, the step is taken. The radar determination result (d): 1 may be output in S308.

The comparison determination process with the radar mask (b) and the increment of the sample data will be described with reference to FIG.

As described above, sample data having a sequence length comparable to that of the radar mask (b) having the maximum sequence length (Tcycle) has been read out, and the sample data sequence is the sequence length of each radar mask (b). The signal patterns shown in the range of are compared. As described above, since the sampling is performed in a common Tsamp period, the series data and the sampling data of each radar mask are synchronized. Then, the comparison between the radar mask (b) and the sample data is performed from the same address data, and the comparison is made within the range of the series length of the corresponding radar mask (b).

For example, assuming that the radar mask n of the radar n has the maximum sequence length and it is 15, the sample data from the start data address 1 to the final data address 15 is read out from at least the sample data storage unit 24. Then, it is assumed that the series length of the radar mask 1 of the radar 1 is 10 and the series length of the radar mask 2 of the radar 2 is 8.

In the match comparison, the signal pattern shown by the sample data series of the data addresses 1 to 10 and the signal pattern shown by the radar mask 1 are compared with respect to the radar 1. For the radar 2, the signal pattern shown by the sample data series of the data addresses 1 to 8 and the signal pattern shown by the radar mask 2 are matched and compared. Then, for the radar n, the signal pattern indicated by the sample data series of the data addresses 1 to 15 and the signal pattern indicated by the radar mask n are matched and compared.

If it does not match any of the radar masks (b), the comparison head data address of the sample data is incremented, and the data addresses 2 to 11 for the radar 1 and the data addresses 2 to 9 for the radar 2 are incremented. The sample data of is compared. Then, for the radar n, the sample data of the data addresses 2 to 16 is compared. Along with this increment, read control is performed so that at least 15 sample data are always read so that the radar mask n having the maximum sequence length can be compared.

FIG. 10 shows a situation in which increment A = 0 or increment B = 0 is output and the above-mentioned increment is continued during the dotted line arrow.

FIG. 11 is a diagram showing a state in which a pattern match between the sample data and the radar mask n is detected while the increment shown in FIG. 10 is continued.

When a pattern match between the sample data and the radar mask is detected, increment A = 1 is output and the increment process is stopped. Then, the corrected reception signal level corresponding to the sample data series corresponding to the matched radar mask is calculated, and the reception level determination to be compared with the radar threshold level (c) is executed.

FIG. 12 is a diagram illustrating an outline of determination between the correction-converted radio space reception level and the radar threshold level.

The antenna received signal level, the fixed gain of the antenna, and the radio space received signal level shown in the figure are the same as those described in FIG. 4, and the received signal level in the radio space obtained by subtracting the fixed gain of the antenna from the antenna received signal level is obtained. Compare with the radar threshold level (c). Note that FIG. 12 is an analog representation of the corrected reception signal level corresponding to the sample data series in order to facilitate understanding, and is processed by a digital value in actual processing.

Since the sample data is data obtained by sampling the corrected reception signal level in the Tsamp cycle, the sample data series matching the radar mask is converted into the data series of the corrected reception signal level before sampling when determining the reception level. Then, it is determined whether or not the predetermined signal level of the radar wave included in the data series of the corrected received signal level exceeds the value (Rx-th) defined by the radar threshold level (c).

FIG. 12A shows a case where the signal level to be compared is less than the radar threshold level (Rx-th), and FIG. 12B shows the case where the signal level to be compared is the radar threshold level (Rx-th). The case where the radar wave is detected is shown.

The predetermined signal level of the radar wave included in the data series of the corrected received signal level may be calculated as the average power per predetermined time width of the radar pulse included in the data series. Then, in the above comparison for all radar pulses included in the data series, when a radar threshold level (Rx-th) or higher is detected with a predetermined probability (for example, 60% or more), the radar determination result (d): 1. Is output.

Further, each radar pulse included in the data series of the corrected received signal level may be compared with the radar threshold level (Rx-th). Also in this case, the radar determination result (d): 1 is output when the probability of detecting the radar pulse signal level of the radar threshold level (Rx-th) or higher is equal to or higher than the predetermined probability.

In the above-mentioned reception level determination, if the probability of detecting the radar threshold level (Rx-th) or higher is less than a predetermined probability, the increment B = 0 is output and the above-mentioned increment is performed. Then, the matching comparison with the radar mask (b) for the incremented sample data series is continued.

Further, the comparison with the radar threshold level (Rx-th) may be performed by comparing with at least one of the maximum value, the minimum value, and the average value of the signal level of each radar pulse included in the data series of the corrected received signal level. It doesn't matter.

When the radar determination result (d): 1 is output, DFS control is activated.

It should be noted that the determination by matching with the radar mask described above and the determination by comparison with the radar threshold level of the received signal level may be added with a predetermined protection condition without being processed by one determination. As the protection condition, for example, a condition such as "when the detection condition is satisfied t times in a row" or "when the detection condition is satisfied k times or more in m times" may be added.

For example, when the protection condition is that the detection condition is satisfied twice in succession, as in the previous example, when the radar mask n of the radar n has the maximum series length and it is set to 15, the following Processing is done.

It is assumed that the sample data from the first data address 1 to the final data address 15 matches the radar mask n in the first matching comparison, and the radar threshold level (Rx-th) or higher is detected even in the signal level determination. In this case, increment A = 1 and increment B = 1 are output.

Increment A = 1 is used for the purpose of stopping the increment in order to determine the signal level by matching with the radar mask n. Then, the increment B = 1 is used for the purpose of processing the target sample data series into a new sample data series shifted by 15 addresses for the Tcycle of the laser mask n in order to perform the second comparison determination. Will be done. That is, when the increment B = 0, the increment (+1) process for one address is performed, and when the increment B = 1, the address for the Tcycle is shifted (address + Tcycle).

Therefore, the second comparison determination is performed for the sample data series from the start data address 16 to the final data address 30. When the radar mask n is matched in this second comparison judgment and the radar threshold level (Rx-th) or higher is detected in the signal level judgment, it is assumed that the protection condition is satisfied, and the radar judgment result (d): 1. Is output.

In this way, when the comparison judgment is performed by adding the protection condition, it is sufficient to control so as to perform the comparison judgment of the number of times of the predetermined protection condition by using the sample data series of another repetition period (Tcycle). ..

As described above, in the present embodiment, the received signal level of various external antennas used according to the wireless communication system is corrected and converted to the signal level of the wireless space with the fixed gain of the antenna to be used. Be prepared. Therefore, it is possible to perform a common radar detection threshold determination without depending on the type of the receiving antenna used in the wireless device.

Further, in the present embodiment, the data series of the received signal level is sampled and used in the cycle of the memory storage cycle signal generated based on the characteristic points of the radar pulse of the radar wave without losing the characteristic points of the radar pulse. To prepare for. Therefore, it is possible to reduce the memory capacity for storing the received signal level data to be processed in time series.

Further, in the present embodiment, even when a plurality of radars are targeted, a configuration is provided for generating a cycle of a memory storage cycle signal common to the feature points of the radar pulses of those radar waves. Then, a radar mask that samples the time domain information of the feature points of the radar pulse of each radar wave in the cycle is generated, and the received signal level is sampled in the same cycle. Therefore, it is possible to synchronize the data series of the received signal level with each radar mask, and simultaneously perform the determination by the matching comparison of the data series of the received signal level and the signal pattern indicated by each radar mask. That is, since the matching is determined by synchronizing a plurality of radar masks, it is not necessary to perform asynchronous processing for each target radar, so that a simplified configuration is possible. Moreover, since the received signal level data to be processed is stored in the memory as the only time series, the memory capacity can be reduced from this viewpoint as well.

As described above, in the present embodiment, even in an environment where antennas having various receiving antenna gains are applied, the necessity of applying the DFS function can be accurately and simply simplified without erroneously detecting a non-radar signal as a specified radar signal. Can be determined.

The wireless device of the present embodiment realizes its operation by mounting circuit components made of hardware components such as LSI (Large Scale Integration) in which a program for realizing each of the above-mentioned functions is incorporated in the wireless device. You may. Further, the wireless device of the present embodiment may be realized by software by executing a program that provides each function of each of the above-mentioned components by a CPU (Central Processing Unit) provided as a control unit. That is, the configuration may be such that each function is realized by software by the CPU executing a program that provides each function and controlling the operation of the wireless device.

It should be noted that some or all of the above embodiments may be described as in the following appendix, but are not limited to the following.
(Appendix 1) The signal level of the radio signal received by the antenna is corrected and converted by the received antenna gain of the antenna, and the received signal level that outputs the data series of the corrected received signal level indicating the received signal level in the corrected and converted radio space. The correction conversion means, radar information including the characteristic points of the radar pulse of the radar wave to be controlled by DFS (dynamic frequency selection), and the received signal level of the radar wave in the radio space which is the threshold for activating DFS control. The signal pattern of the radar pulse corresponding to the radar information generated by storing the indicated radar threshold level and having a predetermined period of the memory storage cycle signal generated by using the radar information and the cycle of the memory storage cycle signal. The radar information setting means outputs a radar information setting means for outputting radar determination information including a radar mask indicating the above and the radar threshold level, and a data series of the corrected reception signal level output by the received signal level correction conversion means. The sample data storage means that samples in the cycle of the memory storage cycle signal and stores the corrected reception signal level in the memory as sample data in the cycle, and the data series of the sample data read from the sample data storage means indicate. By comparing the signal pattern with the radar mask corresponding to the radar information and comparing the corrected received signal level with the radar threshold level, it is determined whether or not there is a radar wave to be controlled by DFS. A wireless device comprising: a radar wave determining means for performing DFS control, and a DFS control starting means for starting DFS control when the radar wave determining means detects the presence of a radar wave to be controlled by DFS.
(Appendix 2) The radar information setting means includes a radar setting unit that stores radar pulse feature points of a plurality of radar waves as the radar information, and a minimum pulse width and a minimum pulse width indicated by the radar pulse feature points of the plurality of radar waves. Features of the sample cycle generator that generates the memory storage cycle signal having a cycle that can be sampled at least twice for the shorter of the minimum time widths of the radar radiation stop time, and the radar pulses of the plurality of radar waves. The radar determination information generation unit that generates the radar mask corresponding to each of the plurality of radar waves by sampling each of the time domain information of the points with the period of the memory storage cycle signal generated by the sample cycle generation unit. The wireless device according to Appendix 1, wherein the radio device comprises.
(Appendix 3) The radar wave determination means obtains the radar mask corresponding to each of the data series of the sample data read from the sample data storage means and the plurality of radar waves generated by the radar determination information generation unit. An extraction comparison determination unit that inputs and compares the signal pattern indicated by the sample data data sequence with the signal pattern indicated by the radar mask, and the sample data data sequence of the signal pattern that matches any of the radar masks. 2. The wireless device according to Appendix 2, comprising a received signal level determination unit that compares the corrected received signal level and the radar threshold level corresponding to the above.
(Appendix 4) The extraction comparison determination unit includes a pattern comparison circuit for inputting each of the plurality of radar masks, and each of the pattern comparison circuits has sample data having a series length comparable to that of the radar mask having the longest repetition period. Is read from the sample data storage means and input as the sample data to be compared, and the corresponding radar mask is characterized in that the matching comparison of the signal pattern is performed within the range of the sequence length of the repetition period of each radar mask. The wireless device according to Appendix 3.
(Appendix 5) The received signal level determination unit inputs the match comparison determination result between the sample data and the radar mask from each of the pattern comparison circuits, and the signal pattern does not match with any of the radar masks. In that case, the first sample data update information instructing the update of the sample data to be compared is output, and when the signal pattern matches with any one of the radar masks, the matched sample data is output. The corrected reception signal level and the radar threshold level are compared based on the match determination circuit and the sample data in which the radar mask output by the match determination circuit and the signal pattern match, and the corrected reception signal level is the said. If it is less than the radar threshold level, the first sample data update information is output, and if the corrected received signal level is equal to or higher than the radar threshold level, the presence of the radar wave to be DFS controlled is detected. The wireless device according to Appendix 4, wherein the signal level determination circuit for outputting radar determination result information for notifying the detection is included.
(Appendix 6) When the extraction comparison determination unit receives the first sample data update information from the reception signal level determination unit, the sample to be compared with the radar mask for each of the pattern comparison circuits. The wireless device according to Appendix 5, further comprising an increment control circuit instructing the data to be updated to a data sequence shifted by one address of the memory.
(Appendix 7) Even when the corrected reception signal level is equal to or higher than the radar threshold level, the signal level determination circuit is added with a predetermined determination protection condition and does not reach the determination protection condition. The wireless device according to Appendix 6, characterized in that it outputs second sample data update information instructing the update of the data series of the sample data to be compared and determined.
(Appendix 8) When the increment control circuit receives the second sample data update information from the signal level determination circuit, the increment control circuit outputs sample data corresponding to the sequence length of the sample data to be compared to each of the pattern comparison circuits. The wireless device according to Appendix 7, wherein the data is read from the memory and instructed to be updated as the comparison target sample data.
(Appendix 9) Radar information including the receiving antenna gain of the antenna, the characteristic points of the radar pulse of the radar wave to be controlled by DFS (dynamic frequency selection), and the radio of the radar wave which is the threshold for activating DFS control. A radar threshold level indicating the received signal level in space is stored in advance, the signal level of the radio signal received by the antenna is corrected and converted by the received antenna gain, and the corrected received signal indicating the received signal level in the corrected and converted radio space is corrected. A level data series is output, a memory storage cycle signal having a predetermined cycle is generated using the radar information, and a signal pattern of a radar pulse corresponding to the radar information is shown using the cycle of the memory storage cycle signal. The radar mask is generated, the data series of the corrected received signal level is sampled in the cycle of the memory storage cycle signal, the corrected received signal level is stored in the memory as sample data in the cycle, and the read from the memory. A radar to be controlled by DFS by comparing the signal pattern shown by the data series of the sample data with the radar mask corresponding to the radar information and comparing the corrected reception signal level with the radar threshold level. A radar detection method comprising determining the presence or absence of a wave, and starting DFS control when the presence or absence of a radar wave to be controlled by DFS is detected in the determination.
(Appendix 10) The radar information includes the feature points of the radar pulses of a plurality of radar waves subject to DFS control, and the memory storage cycle signal is the minimum pulse width indicated by the feature points of the radar pulses of the plurality of radar waves. And the radar mask generated as a signal having a period capable of sampling at least twice for the shorter time width of the minimum time width of the radar radiation stop time, and corresponding to each of the plurality of radar waves, is the plurality of radar masks. The radar detection method according to Appendix 9, wherein each of the time domain information of the feature points of the radar pulse of the radar wave is sampled and generated in the cycle of the memory storage cycle signal.
(Appendix 11) A signal pattern indicated by the data series of the sample data read from the memory is compared with the radar mask corresponding to each of the plurality of radar waves, and a signal matching any of the radar masks is compared. The radar detection method according to Appendix 10, wherein the corrected received signal level corresponding to the data series of the sample data of the pattern is compared with the radar threshold level.
(Appendix 12) The matching comparison between the sample data and the radar mask corresponds to each of the radar masks and the sample data having a series length comparable to the radar mask having the longest repetition period read from the memory. The radar detection method according to Appendix 11, wherein the radar masks are compared within the range of the sequence length of the repetition period of the radar mask.
(Appendix 13) If the signal pattern does not match any of the radar masks in the determination result of the match comparison between the sample data and each of the radar masks, the sample data to be compared is used as 1 in the memory. The data series is updated with the address shifted, and the matching comparison between the sample data and the radar mask is repeated. If the signal pattern matches with any one of the radar masks, the correction is made based on the matching sample data. The radar detection method according to Appendix 12, wherein the received signal level is compared with the radar threshold level.
(Appendix 14) When the corrected received signal level is less than the radar threshold level in the comparison result between the corrected received signal level and the radar threshold level, the sample data to be compared is used as one address of the memory. The sample data is updated to a staggered data series, and the matching comparison between the sample data and the radar mask is repeated. If the corrected received signal level is equal to or higher than the radar threshold level, the presence of a radar wave to be controlled by DFS. The radar detection method according to Appendix 13, wherein the radar determination result information for notifying that the above is detected is output.
(Appendix 15) In the comparison result between the corrected received signal level and the radar threshold level, even if the corrected received signal level is equal to or higher than the radar threshold level, a predetermined judgment protection condition is added and the judgment protection is applied. If the condition is not met, the sample data corresponding to the series length of the comparison target sample data is read from the memory, updated as the comparison target sample data, and the matching comparison between the sample data and the radar mask is repeated. The radar detection method according to Appendix 14, wherein the radar is detected.

1, 2 Radio equipment 11, 21 Antenna 12 Received signal level correction conversion means 13 Radar information setting means 14 Sample data storage means 15 Radar wave judgment means 16 DFS control activation means 22 Received signal level correction conversion unit 23 Radar information setting unit 24 Sample Data storage unit 25 Radar wave judgment unit 26 DFS control activation unit 221 Reception setting unit 222 Correction conversion unit 231 Radar setting unit 232 Sample cycle generation unit 233 Radar judgment information generation unit 241 Memory 242 Storage control unit 251 Extraction comparison judgment unit 252 Received signal Level judgment unit 2511 Pattern comparison circuit 2512 Increment control circuit 2521 Match judgment circuit 2522 Signal level judgment circuit

Claims (2)

Received antenna gain of the antenna, radar information including the characteristic points of the radar pulse of the radar wave to be controlled by DFS (dynamic frequency selection), and the received signal of the radar wave in the radio space which is the threshold for activating DFS control. Processing to store the radar threshold level indicating the level in advance and
A process of correcting and converting the signal level of the radio signal received by the antenna with the receiving antenna gain and outputting a data series of the corrected received signal level indicating the received signal level in the corrected and converted radio space.
The radar information is used to generate a memory storage cycle signal having a predetermined cycle, and the cycle of the memory storage cycle signal is used to generate a radar mask showing a signal pattern of a radar pulse corresponding to the radar information, and the correction is performed. A process of sampling the data series of the received signal level in the cycle of the memory storage cycle signal and storing the corrected received signal level as sample data in the memory in the cycle.
A match comparison between the signal pattern indicated by the data series of the sample data read from the memory and the radar mask corresponding to the radar information, and a comparison between the corrected received signal level and the radar threshold level are performed to perform DFS. Processing to determine the presence or absence of radar waves to be controlled,
In the above determination, when the existence of a radar wave to be controlled by DFS is detected, the process of starting DFS control and
The memory storage cycle signal is included in the radar information, and is the shorter of the minimum pulse width indicated by the feature points of the radar pulses of the plurality of radar waves subject to DFS control and the minimum time width of the radar radiation stop time. On the other hand, the radar mask generated as a signal having a period capable of sampling at least twice and corresponding to each of the plurality of radar waves obtains each of the time domain information of the feature points of the radar pulses of the plurality of radar waves. , The process of sampling and generating in the cycle of the memory storage cycle signal,
The signal pattern indicated by the data series of the sample data read from the memory is compared with the radar mask corresponding to each of the plurality of radar waves, and the sample of the signal pattern matching any of the radar masks is compared. The process of comparing the corrected received signal level corresponding to the data series of data with the radar threshold level, and
In the matching comparison between the sample data and the radar mask, each of the radar masks and the sample data having a series length comparable to the radar mask having the longest repetition period read from the memory are combined with the corresponding radar mask. And the process of comparing within the range of the sequence length of the repetition period of
When the signal pattern does not match with any of the radar masks in the determination result of the match comparison between the sample data and each of the radar masks, the sample data to be compared is shifted by one address of the memory. The data series is updated and the matching comparison between the sample data and the radar mask is repeated. When the signal pattern matches with any one of the radar masks, the corrected received signal level is determined based on the matched sample data. The process of comparing with the radar threshold level and
A radar detection program characterized by having a computer execute. In the comparison result between the corrected received signal level and the radar threshold level, if the corrected received signal level is less than the radar threshold level, the sample data to be compared is shifted by one address of the memory. After updating to a series and repeating matching comparison between the sample data and the radar mask, if the corrected received signal level is equal to or higher than the radar threshold level, the presence of radar waves subject to DFS control is detected. And the process of outputting the radar judgment result information to notify
In the comparison result between the corrected received signal level and the radar threshold level, even when the corrected received signal level is equal to or higher than the radar threshold level, a predetermined judgment protection condition is added and the judgment protection condition is reached. If not, the process of reading the sample data for the series length of the sample data to be compared from the memory, updating the sample data as the sample data to be compared, and repeating the matching comparison between the sample data and the radar mask. of,
The radar detection program according to claim 1, wherein the computer is executed.

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