JP2019219315A - Radar device and radar signal processing method therefor - Google Patents

Abstract

To reduce the overlooking of an interference and enable the interference to be removed with high accuracy, without requiring to specify a complex interference source.SOLUTION: A radar device pertaining to one embodiment of the present invention receives a desired signal of a transmit signal reflected by an observation object after being transmitted and an interfering signal transmitted from an other radar device when receiving a reflected wave of a transmit signal based on a modulating pulse signal, generates an interference reference signal from information relating to the interfering signal, pulse compresses the output of a the received signal with the interference reference signal, compares the pulse compressed signal with a threshold and detects interference data mixed with an interference, blanks the detected interference data, and restores the desired signal from the blanked interference data using the interference reference signal.SELECTED DRAWING: Figure 1

Description

  An embodiment of the present invention relates to a radar device and a radar signal processing method thereof.

  In recent years, it has been eager to reduce damage such as local torrential rains and tornadoes that have caused enormous damage, and there is a high expectation for higher accuracy of weather radar data used for predicting such occurrences. Local meteorological phenomena occur in a very narrow range of several hundred meters, so it is necessary to observe the whole country without gaps in order to capture the occurrence.

  Here, the radar apparatus has a problem that if there is a shield such as a mountain or a building in the observation area, a dead zone is generated behind the obstruction or the data accuracy is likely to be reduced. That is, in order to observe the whole country without omission, it is desirable not to perform wide-area observation with one radar having a wide observation range but to perform observation without omission with a plurality of radars having a narrow observation range. However, when a plurality of radars are disturbed, a signal from another radar site or the like becomes an interference signal, which causes another problem that data accuracy is reduced. In Patent Document 1, when the difference between the average power of 1 CPI (Coherent Processing Interval) of each range and the power of a single hit in the same range exceeds a threshold, it is determined that there is interference. According to the technique described in Patent Document 1, the interference detection accuracy is high when the power difference between the desired signal and the interference signal is large, but when the power is almost the same, it is easy to miss the interference. According to Patent Literature 2, when radar interference of a modulation different from that of a desired signal arrives, first, an interference replica generated by specifying the modulation specifications (carrier frequency, modulation code, PRF, etc.) of the interference signal is subtracted from the received signal. Thus, the interference signal can be removed. On the other hand, it is necessary to accurately estimate the carrier frequency difference between the radars, the amount of uncertain rotation of the phase of the interference signal, the interference power, etc. so that the interference signal and the interference replica match. Unless an additional device or additional information such as sharing of radar information with a signal or the like is prepared, the interference identification processing tends to be complicated.

JP 2011-59024 A JP 2015-52527 A

Fukao, Hamazu. Radar Remote Sensing of Weather and Atmosphere, Revised Second Edition, Kyoto University Press, 502p., 2005.

  As described above, in the conventional radar device, when the interference is detected and removed from the average power of 1 CPI and the power difference of each hit, the estimation accuracy is reduced by overlooking the interference when the power difference between the interference power and the desired signal is small. Cheap. In addition, when subtracting an interference replica, the process of estimating an interference source tends to be complicated.

  The present embodiment has been made in view of the above-described problems, and provides a radar apparatus and a radar signal processing method thereof that do not need to specify a complicated interference source, reduce interference oversight, and can remove interference with high accuracy. The purpose is to do.

  When receiving a reflected wave of a transmission signal due to a modulated pulse signal, the radar apparatus according to one embodiment receives a desired signal in which the transmission signal is reflected from an observation target and an interference signal transmitted from another radar apparatus. Then, an interference reference signal is generated from the information on the interference signal, the output of the received signal is pulse-compressed with the interference reference signal, and the pulse-compressed signal is compared with a threshold value to obtain interference data that interferes with interference. Detecting, blanking the detected interference data, and recovering the desired signal from the blanked interference data using the interference reference signal.

FIG. 1 is a block diagram illustrating a configuration of a radar device according to a first embodiment. FIG. 2 is a block diagram showing a specific example based on the configuration of the embodiment shown in FIG. 1. 3 is a flowchart illustrating a processing operation of the first embodiment illustrated in FIG. 2. FIG. 4 is a diagram showing an example showing that interference oversight can be reduced by performing pulse compression with an interference reference signal in the first embodiment. FIG. 3 is a block diagram illustrating a configuration of an interference signal analysis unit provided in the interference reference signal generation unit according to the first embodiment. 5 is a flowchart illustrating an example of a process performed by an interference signal analyzer according to the first embodiment. FIG. 6 is a block diagram showing a configuration of a radar device according to a second embodiment. 9 is a flowchart illustrating a processing operation according to the second embodiment. FIG. 9 is a block diagram illustrating a configuration of a radar device according to a third embodiment. 9 is a flowchart illustrating a processing operation according to the third embodiment. FIG. 13 is a block diagram showing a configuration of a radar device according to a fourth embodiment. FIG. 9 is a diagram showing an example of occurrence of overlooked interference which is a problem of the conventional method (Patent Document 1).

Hereinafter, embodiments will be described with reference to the drawings.
(1st Embodiment)
FIG. 1 is a block diagram showing the configuration of the radar device according to the first embodiment. This radar apparatus includes a receiving unit 100, an interference pulse compression unit 200, an interference reference signal generation unit 300, an interference detection unit 400, an interference removal unit 500, a desired signal restoration unit 60A, and a desired pulse compression unit 60B. , A desired reference signal generator 700.

  The receiving unit 100 receives a signal including at least one of a desired signal and an interference signal from another radar. The interference reference signal generation unit 300 generates a reference signal of an interference signal in which interference is expected. Here, the interference reference signal generation section 300 may generate a reference signal using basic interference reference information (pulse length and modulation frequency information) estimated in advance in the interference observation mode. Alternatively, a database or the like for managing the proximity radar waveform information may be provided, and the reference signal may be generated by appropriately acquiring the interference signal information from the database.

  The interference pulse compression unit 200 performs pulse compression on the output of the reception unit 100 with the output of the interference reference signal generation unit 300. The interference detection unit 400 compares the power difference between the average power of 1 CPI in the same range and each hit power with a threshold, and outputs data exceeding the threshold. The interference removing unit 500 removes interference by performing a blanking process of replacing the interference data detected by the interference detecting unit 400 with 0. Desired signal restoration section 60A restores the desired signal based on the interference reference signal. Desired reference signal generation section 700 generates a reference signal of the desired signal based on the transmission waveform information of the own radar. Desired pulse compression section 60B pulse-compresses the output of desired signal restoration section 60A with the output of desired reference signal generation section 700, and estimates desired signal information.

  In the radar apparatus having the above-described configuration, the signals are appropriately accumulated by first performing pulse compression using the interference reference signal having a high correlation with the interference signal, so that it is possible to reduce missed interference. Also, since interference removal only requires blanking of interference data, the process of estimating interference signal information is simpler than a method of subtracting an interference replica that requires a strict phase rotation amount, interference signal power, and the like. .

Hereinafter, embodiments for carrying out the invention will be described in more detail. In the embodiment, only a part directly related to the operation is described, and other parts are omitted.
FIG. 2 shows a specific example based on the configuration of the embodiment shown in FIG. In the radar apparatus shown in FIG. 2, the interference pulse compression unit 200 includes a first Fourier transform unit 201, an interference reference signal product unit 202, and a first inverse Fourier transform unit 203. The pulse compression unit 60B includes a second Fourier transform unit 601, a desired signal restoration unit 602, a desired reference signal product unit 603, and a second inverse Fourier transform unit 604. Then, the interference reference signal generated by interference reference signal generating section 300 is input to interference reference signal multiplying section 202 and desired signal restoring section 602, and the desired reference signal generated by desired reference signal generating section 700 is converted to the desired reference signal. It is input to the product section 603.

FIG. 3 is a flowchart showing the processing operation of the first embodiment shown in FIG. Hereinafter, the pulse compression processing according to the first embodiment will be described with reference to this flowchart.
First, a reception signal is input to the reception unit 100 (step S111). The first Fourier transform unit 201 performs a Fourier transform on the output of the receiving unit 100 (step S112). The interference reference signal generation section 300 generates a reference signal of an interference signal in which interference is expected, and the interference reference signal multiplication section 202 outputs the output of the first Fourier transform section 201 and the output of the interference reference signal generation section 300. (Step S113). The first inverse Fourier transform unit 203 performs an inverse Fourier transform on the output of the interference reference signal product unit 202 (step S115). This is equivalent to pulse compression of the received signal with the interference reference signal.

  The interference detection unit 400 compares the power difference between the average power of 1 CPI in the same range and each hit power with a threshold (step S116), and determines that the data has interference interference if the threshold is exceeded (step S117). The average power of one CPI in the same range may be the average power of all hits in the same range, or may be the average power excluding interference hits as in Patent Document 1. If the value is equal to or smaller than the threshold value or after determining the interference data, it is checked whether all range data checks have been completed (step S118). If not completed, the process returns to step S116. Output the interference identification data.

  For example, the interference detection unit 400 outputs a data vector in which 0 is input to a range with interference and 1 is input to a range without interference in order to identify the presence or absence of interference. The interference removing unit 500 removes the interference by blanking processing for replacing the interference data detected by the interference detecting unit 400 with 0 (step S119).

  The second Fourier transform unit 601 performs a Fourier transform on the output of the interference removing unit 500 (Step S120). The output of the second Fourier transform unit 601 is a signal obtained by pulse-compressing the desired signal with the interference reference signal. In order to return this signal to the original desired signal, the desired signal restoring section 602 restores the desired signal based on the interference reference signal (step S121). For example, the desired signal restoration unit 602 restores the desired signal by dividing the output signal of step S120 by the interference reference signal.

  Desired reference signal generation section 700 generates a reference signal of the desired signal based on the transmission waveform information of the own radar. The desired reference signal multiplying section 603 multiplies the output of the desired signal restoring section 602 by the output of the desired reference signal generating section 700 (step S122). The second inverse Fourier transform unit 604 performs an inverse Fourier transform on the output of the desired reference signal product unit 603 (step S123). This is equivalent to pulse compression with a desired reference signal, and it is possible to estimate desired signal information from a signal in which the adverse effect of interference is reduced.

FIG. 12 shows an example of occurrence of interference oversight which is a problem of the conventional system (Patent Document 1).
In Patent Literature 1, when the difference between the average power of 1 CPI in each range and the power of a single hit in the same range exceeds a threshold, it is determined that there is interference. According to the technique described in Patent Document 1, although the interference detection accuracy is high when the power difference between the desired signal and the interference signal is large, the detection accuracy decreases when the power is substantially the same. In a pulse compression radar that performs pulse compression on a signal that has been subjected to frequency or code modulation, the correlation between the interference signal and the desired reference signal is reduced, so that power is not easily accumulated and interference detection is likely to be difficult.

  FIG. 12A is a linear chirp signal in which the pulse lengths of the desired signal and the interference signal are 108 μsec and 56 μsec, respectively, and the modulation frequencies are 1.65 MHz and 1.5 Mz, respectively. The number of hits per CPI is 32, and the range number 100th to 100th. At 540th, a precipitation echo (desired signal) is distributed, and the interference signal simulates an environment in which interference signals are present in the vicinity of the 260th to 290th range numbers of the 5, 15, and 25th hits. The average SN of the desired signal is 50 dB, and the average SN of the interference signal is 75 dB.

FIG. 12B illustrates the power (square of the amplitude value) of each range IQ of the fifth hit where interference is caused by interference, and interference occurs around the range circled from this figure. Can be confirmed.
FIG. 12C illustrates the power of each hit of the 275th range data. As can be seen from FIG. 12 (c), in a weather radar in which the observation target is a cloud of particles that independently move, such as a cloud or rain, the power of each hit per CPI excludes the interference cross hit even when there is no interference. Fluctuates about 10 dB compared to the average power. When the average power of 1 CPI and the received power difference of each hit are used as in Patent Document 1, the interference signal does not accumulate by pulse compression due to reduced correlation with the desired reference signal, and the power difference from the desired signal decreases. In such a case, it is easy to imagine that interference is overlooked and the estimation accuracy is reduced.

  On the other hand, FIG. 4 shows an example showing that it is possible to reduce missed interference by performing pulse compression with an interference reference signal. FIG. 4A illustrates the power (square of the amplitude value) of the entire range IQ of the fifth hit where interference occurs with respect to the desired signal and the interference signal equal to FIG. From FIG. 4A, it can be confirmed that a steep peak occurs in the interference interference range by performing pulse compression with the interference reference signal.

  In FIG. 4B, the solid line indicates the power of each hit of the 325th range data causing interference interference, and the dotted line PA indicates the average power of hits without interference interference. For comparison, in FIG. 4B, the power of each hit of the 275th range data when pulse compression is performed with a desired signal is indicated by a dotted line, and the average power of hits without interference interference is indicated by a dotted line PB. (Re-listed in FIG. 12 (c)). From FIG. 4A, when pulse compression is performed with the desired reference signal, the difference between the interference power of the interference signal and the average power of the hit without interference is less than 10 dB. It can be confirmed that the desired signal power difference increases to 20 dB or more. In this way, by first performing pulse compression with the interference reference signal, it can be expected that the difference between the interference signal power and the average power is likely to increase, and that it is easy to reduce missed interference.

  The interference reference signal may be provided with a database or the like that manages the proximity radar waveform information, may appropriately acquire the interference signal information from the database to generate a reference signal, or may generate the interference reference information estimated in advance in the interference observation mode. The reference signal may be generated using the reference signal. When estimating the interference reference signal in the interference observation mode, the interference reference signal generator 300 includes the interference signal analyzer shown in FIG. The interference signal analyzer may include a pulse length estimator 301, a frequency analyzer 302, and a modulation estimator 303. An example of the process of the interference signal analysis unit will be described with reference to the flowchart shown in FIG.

  First, the received signal in the interference observation mode is input to the pulse length estimation unit 301 (step S201). Then, each input range data power is compared with a threshold (step S202), and when the power exceeds the threshold, it is determined that the data has interference interference (step S203). If it does not exceed the threshold or after determining the interference data, it is checked whether all range data checks have been completed (step S204). If not completed, the process returns to step S202. The interference pulse length is estimated from the length (step S205). The frequency analysis unit 302 analyzes a temporal frequency change of the interference signal using a spectrogram (step S206). The modulation estimator 303 extracts frequency representative values for the specified number of points from the analysis frequencies (step S207), approximates the extracted points by regression analysis, and estimates the modulation frequency of the interference signal (step S208).

(Second embodiment)
According to the interference signal analysis unit of the interference reference signal generation unit 300 described in the first embodiment, rough waveform information of the interference signal can be estimated, but occurrence of an estimation error is inevitable. Also, when acquiring waveform information from a database and generating an interference reference signal, an error is expected to occur in the interference reference signal due to a sampling clock or oscillation frequency shift between radars. In the second embodiment, an interference reference signal more suitable for a received interference signal can be selected from a plurality of interference reference signals. According to the second embodiment, since interference is detected with an interference reference signal having a small error from the interference signal, it is possible to reduce missed interference and improve the estimation accuracy of a desired signal.

  FIG. 7 is a block diagram illustrating a configuration of a radar device according to the second embodiment. In the second embodiment, an interference reference signal selection unit 900 is provided after the first inverse Fourier transform unit 203. In the second embodiment, processing different from that of the first embodiment will be described with reference to the flowchart shown in FIG.

  In the second embodiment, the received signal after the Fourier transform is input to the interference signal product unit (step S301). The interference reference signal multiplying unit 202 holds a plurality of interference reference signal candidates, and multiplies the input with the interference reference signal candidates by sequential processing or parallel processing (step S302). For example, when the interference signal is a linear chirp signal, a plurality of interference reference signal candidates can be generated by changing the pulse length and the modulation frequency within a specified range by a specified step width. When the interference signal is a nonlinear chirp, a plurality of interference reference signal candidates may be generated by processing such as changing the frequency representative point or changing the initial value of the regression analysis. By performing an inverse Fourier transform on the output of step S302, pulse compression using the interference reference signal is performed (step S303), and it is confirmed whether pulse compression has been performed for the number of interference reference signal candidates (step S304). If the processing has not been completed for all the candidates, the process returns to step S302 to execute pulse compression on the interference reference signal that has not been executed. If the processing is completed for all candidates, the power after pulse compression is compared for each candidate, and the interference reference signal candidate having the maximum power is selected as the interference reference signal (step S305).

(Third embodiment)
In the above-mentioned radar apparatus, when the interference detection threshold value is lowered, the oversight of interference can be reduced, but erroneous detection of interference increases. That is, the desired signal is also invalidated by blanking, and the desired signal component is removed, which may lower the estimation accuracy. In the third embodiment, interference components are removed by performing signal interpolation instead of blanking using peripheral range data of blanked data. According to the third embodiment, loss of a desired signal due to blanking processing can be avoided, and estimation accuracy can be improved.

  FIG. 9 is a block diagram illustrating a configuration of a radar device according to the third embodiment. Note that the third embodiment has a configuration in which an interpolation information calculation unit 1000 is added after the interference detection unit 400 of the second embodiment, but the interpolation information calculation unit 1000 is provided at the same location in the first embodiment. An additional configuration may be used.

In the third embodiment, processing different from that of the first embodiment or the second embodiment will be described with reference to the flowchart shown in FIG.
The interpolation information calculation unit 1000 receives the IQ data sampled in the reception time order and the interference identification data (step S401), and calculates the IQ phase of the interference data based on the interference identification data (step S402). Next, the amplitude values of the range data on both sides of the interference data are extracted as representative interpolation amplitude values (step S403). When interference exists over a plurality of ranges, the amplitude values of the data on both sides of the data having the smallest and largest interference range numbers are extracted as representative interpolation amplitude values. Next, an interpolation amplitude value of the interference data is calculated from the representative interpolation amplitude value (step S404), and output from the interpolation information calculation unit 1000. Note that the interpolation value may be calculated by linear interpolation, Gaussian interpolation, or the like. The interference removal unit 500 replaces the interference data with the output of the interpolation information calculation unit 1000 (Step S405). As the data to be replaced by the interference removing unit 500, a value obtained by multiplying the phase value calculated in step S402 by the interpolation amplitude value calculated in step S404, or the interpolation amplitude value itself calculated in step S404 may be used. When the interpolation amplitude value itself is used as the interpolation value, the processing in step S402 may be omitted.

(Fourth embodiment)
In the recent meteorological observation industry, multi-parameter radar using information between horizontal and vertical polarizations, which is effective for particle determination and estimation of rainfall shape, is becoming mainstream. In a multi-parameter radar, a power difference, a phase difference, and a correlation value between polarizations are calculated (see Non-Patent Document 1). When observing the information between polarizations, if the interference removal processing is performed independently for each polarization, the relationship between the polarizations may be broken, and the multi-parameter estimation accuracy may be reduced. In the fourth embodiment, data to be subjected to interference removal is shared between polarizations. According to the fourth embodiment, signals are not separately removed between polarizations, and the relationship between polarizations is not broken, so that it is possible to estimate the polarization information with high accuracy.

  FIG. 11 is a block diagram illustrating a configuration of a radar device according to the fourth embodiment. Note that the fourth embodiment has a configuration in which an inter-polarization interference data sharing unit 1100 is added after the interference detection unit 400 of the third embodiment. However, the first embodiment and the second embodiment May be added to the same location.

  In the fourth embodiment, each of the polarization signals of the horizontal polarization and the vertical polarization is input to the reception unit 100, the above-described processing is performed, and the interference detection unit 400 outputs the interference identification data of each polarization. You. The interference identification data may be a data vector in which 0 is input in a range with interference interference and 1 is input in a range without interference interference.

  The inter-polarization interference data sharing unit 1100 shares the interference identification data of each polarization. For example, by performing an OR operation on the interference identification data of each polarization, the interference identification data between the polarizations can be shared. As described above, by removing the signal based on the interference identification data shared between the polarizations, the common signal removal processing is performed between the polarizations (the signal removal processing for both polarizations is always performed). Information can be maintained.

In the above embodiment, the pulse signal subjected to the frequency modulation is used as the transmission signal. However, the modulation method is not limited to the frequency modulation, but may be another modulation method for pulse compression such as coded modulation.
Although the above embodiment has been described on the premise that pulse compression is performed, the present embodiment functions effectively even when pulse compression is not performed.

  Further, the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the gist thereof at the stage of implementation. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiment. Further, components of different embodiments may be appropriately combined.

  Reference Signs List 100: receiving unit, 200: interference pulse compression unit, 201: first Fourier transform unit, 202: interference reference signal product unit, 203: first inverse Fourier transform unit, 300: interference reference signal generation unit, 301: pulse length Estimating section, 302: frequency analyzing section, 303: modulation estimating section, 400: interference detecting section, 500: interference removing section, 60A: desired signal restoring section, 60B: desired pulse compressing section, 601: second Fourier transform section, 602 ... desired signal restoring unit, 603 ... desired reference signal multiplying unit, 604 ... second inverse Fourier transform unit, 700 ... desired reference signal generating unit, 900 ... interference reference signal selecting unit, 1000 ... interpolation information calculating unit, 1100 ... Inter-wave interference data sharing unit.

Claims (13)

A radar device for receiving a reflected wave of a transmission signal by a modulated pulse signal,
A reception unit that receives a desired signal reflected from the observation target and an interference signal transmitted from another radar device,
An interference reference signal generation unit that generates an interference reference signal from information on the interference signal,
An interference pulse compression unit that performs pulse compression on the output of the reception unit with the interference reference signal,
An interference detection unit that compares the output of the interference pulse compression unit with a threshold and detects data that interferes with interference,
An interference removing unit that blanks the interference data detected by the interference detecting unit,
A desired signal restoration unit that restores the desired signal from the output of the interference removal unit using the interference reference signal,
A radar device comprising: The interference pulse compression unit,
A first Fourier transform unit for performing a Fourier transform on an output of the receiving unit;
An interference reference signal multiplying unit that multiplies the output of the first Fourier transform unit and the interference reference signal,
A first inverse Fourier transform unit for performing an inverse Fourier transform on an output of the interference reference signal product unit;
The radar device according to claim 1, further comprising: further,
A desired reference signal generation unit that generates a desired reference signal from information on the desired signal,
The radar apparatus according to claim 1, further comprising: a desired pulse compression unit that performs pulse compression on an output of the desired signal restoration unit using the desired reference signal. The desired signal restoration unit and the desired pulse compression unit,
A second Fourier transform unit for performing a Fourier transform on an output of the interference removing unit;
A restoration unit for restoring a desired signal with the interference reference signal from an output of the second Fourier transform unit;
A multiplying unit that multiplies the output of the reconstructing unit with the desired reference signal and performs pulse compression,
The radar device according to claim 3, further comprising a second inverse Fourier transform unit that performs an inverse Fourier transform on an output of the product unit.   The radar device according to claim 4, wherein the restoration unit divides an output of the second Fourier transform unit by the interference reference signal. The interference reference signal generator,
The interference reference signal is a linear or nonlinear chirp signal,
Analyze the interference signal received in the interference observation mode to estimate the pulse length and modulation frequency,
The radar apparatus according to claim 1, wherein the interference reference signal is generated based on the estimated pulse length and the modulation frequency. The interference reference signal generator,
As an analysis of the interference signal,
Determine the interference data by comparing the interference signal power and the threshold received in the interference observation mode,
Estimating the pulse length of the interference signal from the interference data,
Analyze the temporal frequency change of the interference signal,
Extract frequency representative points from the analyzed frequencies,
7. The radar device according to claim 6, wherein a modulation frequency is estimated from the frequency representative point. The interference reference signal generator,
Generating a plurality of interference reference signal candidates;
Perform interference pulse compression on the output of the receiving unit in each of the plurality of interference reference signal candidates,
The radar apparatus according to claim 1, wherein an interference reference signal having the highest power among the results of the interference pulse compression is selected. The interference reference signal generator,
When the plurality of interference reference signal candidates are each linear chirp signals,
9. The radar apparatus according to claim 8, wherein a pulse length and a modulation frequency of each of the plurality of interference reference signals are changed by a specified step width within a specified range. further,
An interpolation information calculation unit that calculates the amplitude value of the non-interference data on both sides of the interference data detected by the interference detection unit as a representative interpolation amplitude value,
The interpolation information calculation unit estimates the amplitude value of the interference data from the representative interpolation amplitude value,
The radar device according to claim 1, wherein the interference removing unit replaces the interference data with the estimated amplitude value. The interpolation information calculation unit calculates the phase information of the IQ signal of the interference data,
The radar apparatus according to claim 10, wherein the interference removing unit replaces the interference data with a value obtained by multiplying the estimated amplitude value and the phase information. further,
When the transmission signal is transmitted in a horizontal polarization and a vertical polarization, when receiving the respective reflected waves, a common unit that commonizes data for removing interference between the horizontal polarization and the vertical polarization. Prepare,
The radar device according to claim 1, wherein the interference removing unit removes data corresponding to interference removal data between polarizations shared by the sharing unit. A radar signal processing method for a radar device that receives a reflected wave of a transmission signal by a modulated pulse signal,
The transmission signal receives a desired signal reflected from an observation target and an interference signal transmitted from another radar device,
Generating an interference reference signal from information about the interference signal,
Pulse compression of the output of the received signal with the interference reference signal,
Detecting interference data where interference is caused by comparing the pulse-compressed signal with a threshold,
Blanking the detected interference data,
A radar signal processing method for a radar apparatus for restoring the desired signal from the blanked interference data using the interference reference signal.

Images