CN112526456B - Radar signal identification method - Google Patents
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- CN112526456B CN112526456B CN202011574266.9A CN202011574266A CN112526456B CN 112526456 B CN112526456 B CN 112526456B CN 202011574266 A CN202011574266 A CN 202011574266A CN 112526456 B CN112526456 B CN 112526456B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
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- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/021—Auxiliary means for detecting or identifying radar signals or the like, e.g. radar jamming signals
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Abstract
The invention relates to a radar signal identification method in the field of radar signal processing, which comprises a radar signal identification algorithm design stage, a signal membership degree calculation stage, a signal reliability calculation stage and an unknown signal threat level calculation stage; the invention provides a radar signal identification method, which takes a carrier frequency parameter of an input signal as a basic value, sequentially matches and compares three parameters of a carrier frequency, a repetition period and a pulse width in a database, improves the radar signal identification rate through a signal matching threshold, and calculates the signal reliability and threat level through judging the frequency, the pulse width and the repetition period of an unmatched signal; thereby providing confidence and threat level for each identification signal and further improving work efficiency.
Description
Technical Field
The invention relates to an identification method in the field of radar signal processing.
Background
On a modern battlefield, whether radar signal identification is correct or not directly influences fighting decisions on enemy attack and self defense; the diversity of the radar system and the complexity of the radar signals provide a serious challenge for the radar signal identification technology; the classical radar signal identification process is: comparing the sorted parameter information of the signal to be identified with known radar data in a radar database in an identification processor; when each parameter is consistent with the data of a certain radar in the database, the radiation source is identified as the radar, so that the threat level, type, application, configuration condition and the like of the radar are identified; in an actual electromagnetic environment, multiple operating modes of radar radiation sources, instability of parameters and measurement errors, and the presence of new radars may lead to situations where no recognition results, recognition is ambiguous, or multiple recognition results are generated.
Disclosure of Invention
The invention aims to provide a radar signal identification method, which takes a carrier frequency parameter of an input signal as a basic value, sequentially matches and compares three parameters of a carrier frequency, a repetition period and a pulse width in a database, improves the radar signal identification rate through a signal matching threshold, and calculates the signal reliability and threat level of an unmatched signal through judging the frequency, the pulse width and the repetition period of the unmatched signal; thereby providing confidence level and threat level for each identification signal and further improving working efficiency.
The purpose of the invention is realized as follows: the method comprises a radar signal identification algorithm design stage, a signal membership degree calculation stage, a signal reliability calculation stage and an unknown signal threat level calculation stage; the radar signal identification algorithm design stage comprises
The method comprises the following steps: an antenna and microwaves are used as receiving front ends to receive external electromagnetic signals;
step two: the receiver forms a pulse description word PDW by measuring and calculating the received signal and sends the pulse description word PDW to the signal processing;
step three: the signal processing is to sort the input PDW to form a radiation source description word EDW and send the EDW to signal identification;
step four: the EDW is matched with radar parameters in a database by signal identification, and if the EDW is successfully matched with the radar parameters in the database, an identification result is sent to display equipment;
step five: the EDW is matched with radar parameters in a database by signal identification, and if the EDW is not matched with the radar parameters in the database, the EDW is stored in an unknown signal database for future database expansion;
the signal membership calculation stage comprises
Step six: sequentially searching in a database by taking the carrier frequency parameter of the input signal as a base value, and directly jumping to the next batch if the carrier frequencies are not matched;
step seven: if the carrier frequency is matched, continuously comparing three parameters of the carrier frequency, the repetition period and the pulse width, and calculating the membership UF;
the signal confidence level calculation stage comprises
Step eight: after traversing the database, finding a batch with the highest membership degree, if the membership degree is greater than the matching threshold of the signal, the identification is considered to be successful, and displaying the radar name, threat level and identification reliability of the database sequence number on a displayed identification result column;
the stage of calculating the threat level of the unknown signal comprises
Step nine: if the threat level is greater than or equal to 3, the batch of targets is displayed in red;
step ten: if the maximum membership degree is not over the threshold, the result is not recognized, and unknown information is displayed on a displayed recognition result column;
step eleven: displaying the resolved signal threat level in a display column of which the display identification result is unknown;
step twelve: performing a matching process within a tolerance range of a technical parameter between a tolerance err set based on an actual measurement value and another tolerance err set based on a database value;
step thirteen: selecting three main signal parameters of carrier frequency RF, pulse width PW and repetition period PRI for calculation and identification;
fourteen steps: judging the frequency, the pulse width and the repetition period of a signal which cannot be matched with a known radar in a database;
step fifteen: and judging the calculated signal reliability and threat level, thereby providing the reliability and the threat level for each identification signal.
The radar signal identification method has the advantages that the carrier frequency parameters of input signals are used as basic values, three types of parameters including carrier frequency, repetition period and pulse width are sequentially matched and compared in a database, the radar signal identification rate is improved through a signal matching threshold, and for unmatched signals, the signal reliability and threat level are calculated through judging the frequency, the pulse width and the repetition period of the unmatched signals; thereby providing confidence and threat level for each identification signal and further improving work efficiency.
As a further improvement of the invention, the invention ensures that the tolerance err and the tolerance ferr can realize real-time matching in the technical parameter range and improves the working efficiency; the radar signal identification algorithm design stage comprises two kinds of tolerance with fixed values as parameters, wherein one is a tolerance err set based on an actual measured value, and the other is a tolerance err set based on a database value; the tolerance err and the tolerance fer perform a matching process within a tolerance of a technical parameter.
The method is further improved to ensure that the data of the radar name, the threat level and the identification reliability of the database serial number are effectively displayed; the threshold is set according to the wave band, and the threshold is set to be 0.5-0.7.
As a further improvement of the invention, the danger level is convenient to set; the threat level is set at a value between 0 and 9.
As a further improvement of the present invention, to ensure easy signal identification; the pulse description word PDW includes the carrier frequency, pulse width, arrival time, azimuth, amplitude, and intra-pulse characteristics data described above.
As a further improvement of the invention, the signals are convenient to identify; the radiation source description word EDW comprises carrier frequency, carrier frequency type, pulse width type, repetition frequency type, azimuth, amplitude and intra-pulse characteristic data.
Drawings
Fig. 1 is a table of tolerance settings for carrier frequency RF.
Fig. 2 is a tolerance setting table of the pulse width PW.
FIG. 3 is a schematic flow chart of the present invention.
Detailed Description
As shown in FIGS. 1-3, the object of the present invention is achieved by a radar signal identification algorithm design stage, a signal membership degree calculation stage, a signal reliability calculation stage, and an unknown signal threat level calculation stage; the radar signal identification algorithm design stage comprises
The method comprises the following steps: an antenna and microwaves are used as receiving front ends to receive external electromagnetic signals;
step two: the receiver forms a pulse description word PDW by measuring and calculating the received signal and sends the pulse description word PDW to the signal processing;
step three: the signal processing is to sort the input PDW to form a radiation source description word EDW and send the EDW to signal identification;
step four: the EDW is matched with radar parameters in a database by signal identification, and if the EDW is successfully matched with the radar parameters in the database, an identification result is sent to display equipment;
step five: the EDW is matched with radar parameters in a database by signal identification, and if the EDW is not matched with the radar parameters in the database, the EDW is stored in an unknown signal database for future database expansion;
the signal membership calculation stage comprises
Step six: sequentially searching in a database by taking the carrier frequency parameter of the input signal as a base value, and directly jumping to the next batch if the carrier frequencies are not matched;
step seven: if the carrier frequency is matched, continuously comparing the carrier frequency, the repetition period and the pulse width to calculate the membership UF;
the signal reliability calculation stage comprises
Step eight: after traversing the database, finding a batch with the highest membership degree, if the membership degree is greater than the matching threshold of the signal, the identification is considered to be successful, and displaying the radar name, threat level and identification reliability of the database sequence number on a displayed identification result column;
the stage of threat level calculation of the unknown signal comprises
Step nine: if the threat level is greater than or equal to 3, the batch of targets is displayed in red;
step ten: if the maximum membership degree is not over the threshold, the recognition result is not recognized, and unknown data is displayed on a displayed recognition result column;
step eleven: displaying the calculated signal threat level in a display column of which the display identification result is unknown;
step twelve: performing a matching process within a tolerance range of a technical parameter between a tolerance err set based on an actual measurement value and another tolerance err set based on a database value;
step thirteen: selecting three main signal parameters of carrier frequency RF, pulse width PW and repetition period PRI for calculation and identification;
fourteen steps: judging the frequency, the pulse width and the repetition period of a signal which cannot be matched with a known radar in a database;
step fifteen: and judging the calculated signal reliability and threat level, thereby providing the reliability and the threat level for each identification signal.
When the invention works, the antenna and the microwave are used as receiving front ends to receive external electromagnetic signals; the receiver forms a pulse description word PDW by measurement and calculation into a signal to be processed, wherein the pulse description word PDW comprises carrier frequency, pulse width, arrival time, direction, amplitude and intra-pulse characteristics; the signal processing is carried out by sorting the input PDW to form a radiation source description word EDW which comprises carrier frequency, carrier frequency type, pulse width type, repetition frequency type, direction, amplitude and intra-pulse characteristics, and the EDW is sent to the signal identification; the EDW is matched with the radar parameters in the database by signal identification, and if the EDW is successfully matched with the radar parameters in the database, the identification result is sent to display equipment; if the match is not successful, the signal is stored in the unknown signal database for future data expansion.
Defining two parameters in a radar signal identification algorithm as tolerances of fixed values, wherein one parameter is a tolerance err set based on an actual measured value, and the other parameter is a tolerance fer set based on a database value; the matching process is performed within the tolerances of the technical parameters.
The tolerance of the actual measured value carrier frequency RF is set to a fixed value according to the frequency band, see fig. 1; the pulse width PW tolerance setting is shown in figure 2; the tolerance of the PRI of the repetition period is calculated according to the repetition frequency precision of PRF2 multiplied by 10 < -6 > +1, and the calculation formula is as follows:
err（us）= PRI - (1/(PRF+(PRF2×10-6+1)))×1000000
note: here PRI is the input repetition period in us, PRF is the repetition frequency calculated from PRI, PRF =1/(PRI 10-6).
Settings on the database values fer: fer = (max-min)/2
Sequentially searching in a database by taking the carrier frequency parameter of the input signal as a base value, and directly jumping to the next batch when the carrier frequencies are not matched; and if the carrier frequency is matched, continuously comparing the carrier frequency, the repetition period and the pulse width to calculate the membership UF.
The total membership degree is 1, and the weights of three parameters of carrier frequency RF, pulse width PW and repetition period PRI are respectively as follows: 0.6, 0.15, 0.25; the carrier frequency membership Urf consists of a carrier frequency value Urf and a carrier frequency type urft, and the repetition period membership Upri consists of a repetition interval value Upri and a repetition interval type uprit. The calculation method of the carrier frequency membership Urf, the pulse width membership Upw and the repetition period membership Upri is as follows:
Urf=urf*0.5+urft
Upw=upw*0.15
Upri=upri*0.20+uprit
total degree of membership: UF = Urf + Upw + Upri.
Reliability: CON = UF 100.
After traversing the database, finding a batch with the highest membership degree, if the membership degree is greater than the matching threshold of the signal, the threshold is set according to the wave band, and the current default is 0.6, the identification is successful, the radar name, the threat level, the identification reliability and the like of the serial number of the database are displayed on a displayed identification result column, and if the threat level is greater than or equal to 3 and the threat level is between 0 and 9, the batch of targets are displayed in red; if the maximum membership degree is not over the threshold, it is determined that no recognition result is obtained, and an unknown is displayed on the displayed recognition result column.
Confidence and threat level calculations for unidentified signals:
A) threat level calculation
1) Frequency threat determination
9470GHz <= RF < 18000GHz， THL1=3；
2000GHz <= RF < 9300GHz， THL1=2；
9300GHz < = RF < 9470GHz and 1us < = PW, THL1= 2;
9300GHz < = RF < 9470GHz and 0.1us < = PW < =1us, THL1= 1;
500GHz <= RF < 2000GHz， THL1=1；
2) repeatedly spaced threat determination
2us <= PRI < 100us， THL2=3；
100us <= PRI < 1000us， THL2=2；
1000us <= PRI < 10000us， THL2=1；
3) Threat determination of pulse width
Continuous wave, THL3= 3;
0.1us <= PW < 1us， THL3=2；
1us <= PRI < 500us， THL3=1；
total threat level: THL = 9- (THL 1+ THL2+ THL 3)
The threat level is 0 at the highest and 9 at the lowest.
B) Reliability: 0
And displaying the calculated signal threat level in a display column of which the display identification result is unknown.
The present invention is not limited to the above embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts based on the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (6)
1. A radar signal identification method is characterized by comprising a radar signal identification algorithm design stage, a signal membership degree calculation stage, a signal reliability calculation stage and an unknown signal threat level calculation stage; the radar signal identification algorithm design stage comprises
The method comprises the following steps: an antenna and microwaves are used as receiving front ends to receive external electromagnetic signals;
step two: the receiver forms a pulse description word PDW by measuring and calculating the received signal and sends the pulse description word PDW to the signal processing;
step three: the signal processing is to sort the input PDW to form a radiation source description word EDW and send the EDW to signal identification;
step four: the EDW is matched with radar parameters in a database by signal identification, and if the EDW is successfully matched with the radar parameters in the database, an identification result is sent to display equipment;
step five: the EDW is matched with radar parameters in a database by signal identification, and if the EDW is not matched with the radar parameters in the database, the EDW is stored in an unknown signal database for future database expansion;
the signal membership calculation stage comprises
The method comprises the following steps: sequentially searching in a database by taking the carrier frequency parameter of the input signal as a base value, directly jumping to the next record if the carrier frequencies are not matched;
step two: if the carrier frequency is matched, continuously comparing the two parameters of the repetition period and the pulse width, and calculating the membership UF;
the carrier frequency matching means that the carrier frequency of the input signal is compared with the carrier frequency recorded by the database within a certain tolerance range, if the two parameters are within the certain tolerance range, the matching is considered to be successful, otherwise the matching is unsuccessful;
the signal reliability calculation stage comprises
The method comprises the following steps: after traversing the database, finding a record with the highest membership degree, if the membership degree is greater than the matching threshold of the signal, determining that the identification is successful, and displaying the radar name, the threat level and the identification reliability in the database on a displayed identification result column;
step two: if the threat level of the identification result is more than or equal to 3, the signal is displayed in red;
the stage of threat level calculation of the unknown signal comprises
The method comprises the following steps: after traversing the database, finding a record with the highest membership degree, if the membership degree is not beyond a threshold, determining that no recognition result is obtained, and displaying unknown information on a displayed recognition result column;
step two: calculating the threat level of a signal which cannot be matched with the known radar in the database by judging the frequency, the pulse width and the repetition period of the signal, and calling the threat level as an unknown signal, wherein the credibility of the unknown signal is set to be 0;
step three: and displaying the threat level of the unknown signal in a display column for displaying that the identification result is unknown.
2. A radar signal identification method according to claim 1, characterized in that the tolerance range includes two kinds, one is a tolerance err set based on actual measurement values, and the other is a tolerance fer set based on database values.
3. The radar signal identifying method of claim 1, wherein the threshold is set according to a band, and the threshold is set to be between 0.5 and 0.7.
4. A radar signal identification method according to claim 1, characterized in that the threat level is a value set between 0 and 9.
5. The radar signal identification method of claim 1, wherein the Pulse Description Word (PDW) comprises a carrier frequency, a pulse width, an arrival time, an azimuth, an amplitude, and an intra-pulse characteristic.
6. The radar signal identification method of claim 1, wherein the EDW includes a carrier frequency, a carrier frequency type, a pulse width type, an repetition frequency type, an orientation, an amplitude, and an intra-pulse feature.
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