CN106483506B - A kind of cognition type self-adapting interference suppression method - Google Patents
A kind of cognition type self-adapting interference suppression method Download PDFInfo
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Abstract
The invention discloses a kind of cognition type self-adapting interference suppression methods, characterized in that first array received to signal by digital beam froming obtain required for wave beam output, extraction section accessory channel to interference number judge；The analysis of first time interference characteristic is completed after digital beam froming；According to different interference types, using different interference cancellation methods.Advantageous effects of the invention: this method establishes the thought of interference describing word and adaptive strategy selection, to enable radar that interference characteristic analysis is rapidly completed, by the way that intelligent cognition technology is effectively combined with Anti-Jamming Technique, feature judgement to interference, a variety of interference types are identified after digital beam froming and pulse compression respectively, it constructs a kind of with intelligentized adaptive strategy center module, matched interference cancellation method is dispatched in adaptive strategy center module, to realize the Anti-Jamming Technique of cognition type.
Description
Technical field
The present invention relates to a kind of cognition type self-adapting interference suppression methods, belong to Digital Array Radar technical field.
Background technique
Electromagnetic environment is increasingly complicated, needs radar that the sensing capability of environment is continuously improved.The complexity of electromagnetic interference and
Diversity will lead to the target detection capabilities degradation of radar.Interference can be there are many type, such as continuous wave CO_2 laser, turns
Hairdo interference and impulse disturbances etc..When continuous wave CO_2 laser enters from secondary lobe, press down frequently with Adaptive Sidelobe Canceling (SLC) technology
System interference；When impulse disturbances enter from secondary lobe, inhibited using sidelobe blanking technology.But sidelobe blanking be easy to cause target
Loss.And conventional sidelobe cancellation algorithm is unable to complete effectively interference sample.Repeating jamming obtains larger when pulse is compressed
Gain, using the sidelobe cancellation before traditional pulse compression after completing to offset, part interference is still under noise.Cause
This needs to carry out after pulse is compressed offseting processing, and sidelobe cancellation is referred to as PC-SLC after pulse pressure.Since interference cancellation needs needle
The different effective cognitions for offseting method, then needing to realize to interference is used to different interference, thus the corresponding interference of selection
Suppressor mode.
Since conventional radar systems can not effectively recognize interference environment, cause radar that can not distinguish interference type automatically,
Corresponding means are taken to inhibit interference.Under battlefield surroundings complicated and changeable, manual anti-interference mode cannot have been coped with quickly
The interference environment of variation, common Anti-Jamming Technique can not cope with complicated and diversified interference mode.
Summary of the invention
To solve the deficiencies in the prior art, the purpose of the present invention is to provide a kind of cognition type adaptive interference mitigation sides
Method is effectively combined intelligent cognition technology with Anti-Jamming Technique, by the feature judgement to interference, respectively in digital beam froming
(DBF) and after pulse compression a variety of interference types are identified, constructing one kind has intelligentized adaptive strategy center module,
Matched interference cancellation method is dispatched in adaptive strategy center module, to realize the Anti-Jamming Technique of cognition type.
In order to achieve the above objectives, the present invention adopts the following technical scheme that:
A kind of cognition type self-adapting interference suppression method, characterized in that include the following steps:
1) by array received to signal obtained by digital beam froming required for export after wave beam；
2) extraction section accessory channel judges interference number, according to the interference number selection accessory channel obtained
Number；This step is the accessory channel number in order to determine sidelobe cancellation use, simplifies adaptive interference mitigation calculation amount, needs
Interference number is judged.
3) interference characteristic analysis is carried out, image parameter is pulse envelope, pulsewidth and pulse spacing in its time domain, by these
Parameter combines and forms cognition describing word；
4) it is differentiated according to type of the result of step 3) to all kinds of wave beams, is selected after being transmitted to adaptive strategy center module
Appropriate anti-interference mode is selected, judgment criterion is as follows:
If continuous wave CO_2 laser, signal sampling point, which is chosen, emits the preceding moment, and open a window 1024 sampled points of length, and use is adaptive
Sidelobe cancellation afterpulse is answered to compress；
If impulse disturbances, interference sample is realized in a frame data period receiving, interference sample intercepts at 2048 points, uses
The compression of Adaptive Sidelobe Canceling afterpulse；
If repeating jamming, directly progress pulse compression；
5) for step 4), treated that interference carries out interference characteristic analysis, and judges treatment effect:
For continuous wave CO_2 laser and impulse disturbances, if interference signal envelope is less than preset threshold value and without spike arteries and veins
Punching then proves that interference is effectively suppressed；
For repeating jamming, interference envelope, pulse width and pulse spacing are determined, interference characteristic is transmitted to adaptively
Inhibit conflicting mode to be handled using Adaptive Sidelobe Canceling after Strategy Center's module, carries out interference characteristic point again later
Analysis is extracted spike sample and is counted if interference envelope, pulse width and pulse spacing are more than setting value and generate spike
Sidelobe cancellation weight vector is calculated, interference is inhibited.
Further, specific steps in the step 1) are as follows: for the radar uniform line-array array of M unit, if i-th
Channel receiving signal is xi(k), k indicates discrete time, if signal beam is oriented to θ, a (θ) is input signal steering vector, meter
Calculating formula isJ represents imaginary number in formula, and d is array element spacing, and λ is wave
It is long, []TIndicate transposition；After array beams form weighting, exports and beIn formula ()*Indicate conjugation,
wiFor i-th of channel DBF weight.
Further, the specific steps of the step 2) are as follows:
21) the following X of data composition for extracting N number of accessory channel is sets(k)=[x1(k),x2(k),…,xN(k)]T；
22) accessory channel covariance matrix R is soughtXX=Xs(k)Xs H(k), ()HRepresent conjugate transposition；
23) Eigenvalues Decomposition λ is carried out to covariance matrixi=eig [RXX], i=1,2 ..., N, eig [] is indicated in formula
Characteristic root analytic function, λiIt is expressed as ith feature root, wherein smallest real eigenvalue is expressed as λmin=min { λ1,λ2,…,λN}；
24) ratio for calculating other feature root and smallest real eigenvalue, is denoted as
25) defined variable Λ=[δ1,δ2,…,δN], when with threshold value ρ0When comparing, greater than the characteristic root number of threshold value
It is exactly corresponding interference number, accessory channel number is chosen according to interference number.
Further, it is for the judgment criterion of parameters object in the step 4):
I) differentiated using pulsewidth: to acquire output signal pulses width, being needed to each disturbing pulse rising edge and failing edge
Judged；Obtained rising edge and failing edge sampled point are marked, the rising edge and failing edge of same pulse are utilized
Difference calculates pulse width, the following PW=T of calculation formulasNs, T in formulasFor sampling period, NsFor rising edge and failing edge difference
Sampling number；
If σPW1For pulsewidth threshold value, when signal pulsewidth is greater than σPW1When, it can be determined that interference signal is pulse signal；Work as letter
It feels the pulse wide less than σPW1When, then it may determine that interference signal is continuous wave signal；
II) differentiated using pulse envelope: after digital beam froming, seeking the envelope of required beamformer output signalY in formulaI(k) and yQ(k) real part and imaginary part for being beam signal y (k)；
Threshold value σ is taken to the signal envelope at a certain moment after digital beam fromingPA1If signal envelope is greater than threshold value
σPA1, then it is assumed that interference exists, otherwise it is assumed that not interfering with；
III) differentiated using the pulse spacing: after digital beam froming, threshold value σ being set to waveform pulse intervalPR1, when
Signal pulse interval is greater than σPR1, it can be determined that interference signal is impulse disturbances；When signal recurrence interval is less than σPR1, then can sentence
Disconnected interference signal is continuous wave CO_2 laser.
Advantageous effects of the invention: this method establishes the thought of interference describing word and adaptive strategy selection,
It is right by effectively being combined intelligent cognition technology with Anti-Jamming Technique to enable radar that interference characteristic analysis is rapidly completed
The feature of interference judges, identifies after digital beam froming (DBF) and pulse compression to a variety of interference types respectively, building one
Kind has intelligentized adaptive strategy center module, dispatches matched interference cancellation method in adaptive strategy center module,
To realize the Anti-Jamming Technique of cognition type.
Detailed description of the invention
Fig. 1 is the functional block diagram of this method；
Fig. 2 is the continuous wave CO_2 laser signal time domain modulus value of embodiment 1；
Fig. 3 is AF panel result of the embodiment 1 using this method；
Fig. 4 is that the continuous wave CO_2 laser of embodiment 1 inhibits afterpulse compression result；
Fig. 5 is the pulse interference signal time domain modulus value of embodiment 2；
Fig. 6 is AF panel result of the embodiment 2 using this method；
Fig. 7 is the pulse interference suppression afterpulse compression result of embodiment 2；
Fig. 8 is the repeating jamming signal amplitude of embodiment 3；
Fig. 9 is the repeating jamming pulse compression of embodiment 3；
Figure 10 be embodiment 3 pulse pressure after signal pulse width；
Figure 11 be embodiment 3 pulse pressure after signal repetition rate；
Figure 12 is AF panel result of the embodiment 3 using this method.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
In conjunction with attached drawing 1, the principle of this method is: realizing the output of target observation wave beam, later, root using digital beam froming
Different Adaptive Sidelobe Cancelings is realized according to interference type.
Interference cognition is divided into the progress of three steps: interference number is determined using accessory channel, after digital beam froming and arteries and veins
Interference temporal signatures are extracted after punching press contracting respectively.Obtained interference characteristic is transmitted to adaptive strategy center module, is completed
To the signature analysis of interference, continuous wave CO_2 laser, impulse disturbances and repeating jamming are distinguished.If interference be continuous wave CO_2 laser with
Impulse disturbances, switch 1 connect the end a, carry out Adaptive Sidelobe Canceling before DBF afterpulse compresses.If interference is dry for relay type
It disturbs, switch 1 connects the end b after digital beam froming, carries out pulse to signal and compresses to close switch 2, adaptive after carrying out pulse pressure
Sidelobe cancellation.Actually namely according to different interference types, to determine the use of pulse compression and Adaptive Sidelobe Canceling
Tandem.
Interference characteristic after DBF is extracted, the present invention is mainly to pulse envelope, pulsewidth, pulse spacing in its time domain
Equal characteristic parameters are analyzed, these parameters are combined and form cognition describing word (RDW), can efficiently be completed to characteristic parameter
Statistics, fast implements the classification and identification to interference, but can also carry out the selection of characteristic parameter according to the actual needs
With analysis.
In the method by carrying out interference characteristic point to interference signal envelope, pulse width and pulse spacing after DBF
Analysis, can tell continuous wave CO_2 laser and impulse disturbances.Be transmitted to select after adaptive strategy center module it is appropriate anti-interference
Mode, so inhibiting to interfere using Adaptive Sidelobe Canceling.
Adaptive Sidelobe Canceling is to subtract each other that reach suppressed sidelobes dry with main channel signal by weighting to auxiliary channel signal
The purpose disturbed.Main processes of calculation is as follows:
Calculate accessory channel covariance matrix RXX=Xs(k)Xs H(k), major-minor channel cross-correlation vector P is calculatedXy=Xs(k)
y*(k), adaptive weighted W in sidelobe cancellation is calculateds=RXX -1PXy, in formula, []-1Representing matrix inversion operation, ()*It indicates
Conjugation.Wave beam after weighting offsets exports z (k) are as follows: z (k)=y (k)-Ws *(k)Xs(k), ()*Indicate conjugation.
It is compressed in the present invention using pulse, for continuous wave CO_2 laser and impulse disturbances, Adaptive Sidelobe Canceling afterpulse pressure
The purpose of contracting is to detect whether interference is suppressed.
For repeating jamming, is compressed in digital beam froming afterpulse, complete the detection to interference signal.
Pulse compression is will to emit wider width and the lower pulse compression of peak power, obtains narrower width, peak value
The detection performance and distance resolution of power.It is substantially exactly that optimum filtering is carried out to echo-signal.Usually have time domain correlation and
Frequency domain Fast Fourier Transform (FFT) (FFT) two methods:
Time domain correlation is exactly that convolution algorithm is carried out to radar echo signal, and calculation formula is p (k)=r (k) * h (k), formula
Middle * indicates convolution, and r (k) is the echo-signal after A/D sampling, and h (k) is the impulse response of pulse pressure filtering；P (k) be pulse pressure after believe
Number output.
Frequency domain method be then echo-signal FFT is calculated frequency spectrum R (ω), then with pulse pressure filtering frequency response H (ω) phase
Multiply, finally completes Fast Fourier Transform Inverse (IFFT), pulse pressure result can be obtained.Calculation formula is p (k)=IFFT [R (ω)
H (ω)]=IFFT { FFT [r (k)] FFT [h (k)] } is same in two ways since convolution is equivalent to frequency domain multiplication product
One concept.When signal is big Timed automata, frequency domain FFT method is generally used.
It is identical as the method for interference characteristic is extracted after DBF that interference characteristic is extracted after pulse pressure for repeating jamming.For
Continuous wave CO_2 laser and impulse disturbances extract interference characteristic after pulse compression, if interference signal envelope is less than threshold value σPA2, then
Prove that interference is effectively suppressed.For repeating jamming, interference characteristic is extracted after pulse compression, determines interference envelope, pulse
Interference characteristic is transmitted to adaptive strategy center module by width and pulse spacing.It is completed by policy selection dry to relay type
Disturb inhibition.
(8) adaptive strategy center module
When interference mode difference, anti-interference mode changes therewith, and the two is mapped and constitutes adaptive strategy center
Module.This module refers to the interference identified according to interference characteristic, and it is complete to choose corresponding one or several kinds of antijamming measures
At AF panel, so that the interference free performance of radar system be made to be optimal.Compared with traditional anti-interference mechanism method, dry
The cognition for inhibiting front and back to complete to interference is disturbed, Radar cross-section redaction level is more effectively improved.Particular content is as shown in the table:
Table 1 is interference cognitive strategy table
Wherein, pulse width is denoted as PA, and impulse amplitude is denoted as PW, and the pulse spacing, which is denoted as the subscript in PR table, indicates the
The value that one/secondary interference characteristic extracts, threshold value σPA1, σPW1, σPR1, σPA2, σPW2, σPR2Empirically value is chosen.
Embodiment
Three kinds of interference signals are completed to method validation of the invention by Computer Simulation.Assuming that the radar of Unit 1 is equal
Even linear array, cell spacing are half-wavelength, and signal-to-noise ratio takes 20dB.
Wherein, the interference signal in embodiment 1 is noise FM continuous wave CO_2 laser.
Interference signal in embodiment 2 is impulse disturbances.
Interference signal in embodiment 3 is repeating jamming.
Three kinds of interference signal verifying interference characteristic extracting methods, jamming exposure area and final adaptive disturbance are pressed down respectively
Performance processed.
Given in table 2 three kinds interference after DBF with the compressed interference characteristic parameter of pulse.If interference characteristic after DBF
Signal envelope thresholding σPA1It is 60, pulse width thresholding σPW1Take 20 μ s, pulse spacing thresholding σPR1For 200 sampled points.Pulse compression
Interference characteristic signal envelope thresholding σ afterwardsPA2For 80dB, pulsewidth thresholding σPW2For 0.3 μ s, pulse spacing thresholding σPR1For 1000 samplings
Point.
Table 3DBF and interference characteristic parameter after pulse pressure
Embodiment 1:
Interference signal is noise FM continuous wave, and interference is located at -45 °, and signal is located at 30 °.It is interfered before pulse pressure and noise
Ratio takes 30dB.The time domain modulus value of interference is as shown in Figure 2.Interference signal is arranged in interference characteristic after analyzing DBF in the present embodiment
Envelope value PA1It is 150, pulse width values PW1For 40 μ s, pulse spacing PR1It is 0.As can be seen from Figure 2, continuous wave CO_2 laser amplitude is greater than
Threshold value σPA1.Interference signal pulsewidth is greater than pulsewidth threshold value σPW1, interference signal pulse interval is less than threshold value σPR1.The present invention
Afterpulse compression pulse pressure effect is suppressed in continuous wave CO_2 laser as shown in figure 4, obtaining interference very well using method of the invention
Ground inhibits.
By being schemed in embodiment 1 it is found that interference signal envelope is greater than thresholding 60 after DBF, pulse width is greater than 20 μ s of thresholding,
Repetition rate is less than 200 points.Use the present invention cancellation ratio is obtained for 15.25dB to AF panel to method.Pulse compression
Afterwards, interference signal does not generate obvious spike, then proves that interference is effectively suppressed.So can tell through the invention continuous
Interference wave signal.
Embodiment 2
Interference signal is the impulse disturbances that duty ratio is 50%, and interference is located at -45 °, and interference and the ratio of noise take 30dB.
The time domain modulus value of interference is as shown in Figure 5.AF panel performance is obtained using method of the invention as shown in fig. 6, interference obtains very
Inhibit well.The present invention impulse disturbances be suppressed afterpulse compression pulse pressure effect it is as shown in Figure 7.
By being schemed in embodiment 2 it is found that being greater than thresholding 60 in DBF afterpulse interference signal envelope, pulse width is less than thresholding
20 μ s, repetition rate are greater than at 200 points.Use the present invention cancellation ratio is obtained for 11.43dB to AF panel to method.Pulse
Signal envelope then proves that interference being effectively suppressed less than threshold value and without spike after compression.So can divide through the invention
It Chu not pulse interference signal.
Embodiment 3
Interference signal is repeating jamming, and interference is located at -45 °, and interference and the ratio of noise take 30dB.Interference is in the time domain
Amplitude it is as shown in Figure 8.For pulse compression pulse pressure effect of the present invention as shown in figure 9, analyzing interference characteristic after pulse compression, pulse is wide
Degree and repetition rate are as shown in Figure 10,11.It is as shown in figure 12 using method AF panel performance of the invention, again to Figure 12 into
Row supplementary explanation, when actually emulating, picture is really color image, can be best seen in boundary, among data
Be have echo signal, but while being changed to completely black be not it is clear that still from both sides this it appears that interference is suppressed,
Interference is inhibited well.
By being schemed in embodiment 3 it is found that repeating jamming signal envelope is greater than thresholding 60 after DBF, pulse width is greater than door
20 μ s are limited, repetition rate is less than 200 points.After pulse compression, interference signal envelope is greater than threshold value 80, and pulse width is greater than thresholding
0.3 μ s, repetition rate are 2000 points and generate spike.After extracting spike, sidelobe cancellation weight is calculated, interference is believed
Number inhibit obtain cancellation ratio be 9.87dB.So repeating jamming signal can be gone out respectively through the invention.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (3)
1. a kind of cognition type self-adapting interference suppression method, characterized in that include the following steps:
1) by array received to signal obtained by digital beam froming required for export after wave beam；
2) extraction section accessory channel judges interference number, according to of the interference number selection accessory channel obtained
Number；
3) interference characteristic analysis is carried out, image parameter is pulse envelope, pulsewidth and pulse spacing in its time domain, by these parameters
Describing word is recognized in conjunction with being formed；
4) it is differentiated according to type of the result of step 3) to all kinds of wave beams, is selected just after being transmitted to adaptive strategy center module
When anti-interference mode, judgment criterion is as follows:
If continuous wave CO_2 laser, signal sampling point, which is chosen, emits the preceding moment, and open a window 1024 sampled points of length, using adaptive side
Valve offsets afterpulse compression；
If impulse disturbances, interference sample is realized in a frame data period receiving, interference sample intercepts at 2048 points, and use is adaptive
Sidelobe cancellation afterpulse is answered to compress；
If repeating jamming, directly progress pulse compression；
Judgment criterion for parameters object is:
I) differentiated using pulsewidth: to acquire output signal pulses width, needing to carry out each disturbing pulse rising edge and failing edge
Judgement；Obtained rising edge and failing edge sampled point are marked, the rising edge of same pulse and the difference of failing edge are utilized
Calculate pulse width, the following PW=T of calculation formulasNs, T in formulasFor sampling period, NsIt is sampled for rising edge and failing edge difference
Points；If σPW1For pulsewidth threshold value, when signal pulsewidth is greater than σPW1When, it can be determined that interference signal is pulse signal；Work as signal
Pulsewidth is less than σPW1When, then it may determine that interference signal is continuous wave signal；
II) differentiated using pulse envelope: after digital beam froming, seeking the envelope of required beamformer output signalY in formulaI(k) and yQ(k) real part and imaginary part for being beam signal y (k)；
Threshold value σ is taken to the signal envelope at a certain moment after digital beam fromingPA1If signal envelope is greater than threshold value σPA1, then
Think that interference exists, otherwise it is assumed that not interfering with；
III) differentiated using the pulse spacing: after digital beam froming, threshold value σ being set to waveform pulse intervalPR1, work as signal
Pulse spacing is greater than σPR1, it can be determined that interference signal is impulse disturbances；When signal recurrence interval is less than σPR1, then may determine that dry
Disturbing signal is continuous wave CO_2 laser；
5) for step 4), treated that interference carries out interference characteristic analysis, and judges treatment effect:
For continuous wave CO_2 laser and impulse disturbances, if interference signal envelope is less than preset threshold value and without spike,
Then prove that interference is effectively suppressed；
For repeating jamming, interference envelope, pulse width and pulse spacing are determined, interference characteristic is transmitted to adaptive strategy
Inhibit conflicting mode to be handled using Adaptive Sidelobe Canceling after center module, carries out interference characteristic analysis again later, if
Interference envelope, pulse width and pulse spacing are more than setting value and generate spike, then extract spike sample and calculate side
Valve offsets weight vector, inhibits to interference.
2. a kind of cognition type self-adapting interference suppression method according to claim 1, characterized in that tool in the step 1)
Body step are as follows:
For the radar uniform line-array array of M unit, if i-th of channel receiving signal is xi(k), k indicates discrete time, if
Signal beam is oriented to θ, and a (θ) is input signal steering vector, and calculation formula isJ represents imaginary number in formula, and d is array element spacing, and λ is wavelength, []T
Indicate transposition；
Array beams are formed and are weighted, exports and isIn formula ()*Indicate conjugation, wiFor i-th of channel
DBF weight.
3. a kind of cognition type self-adapting interference suppression method according to claim 1, characterized in that the tool of the step 2)
Body step are as follows:
21) the following X of data composition for extracting N number of accessory channel is sets(k)=[x1(k),x2(k),…,xN(k)]T；
22) accessory channel covariance matrix R is soughtXX=Xs(k)Xs H(k), ()HRepresent conjugate transposition；
23) Eigenvalues Decomposition λ is carried out to covariance matrixi=eig [RXX], i=1,2 ..., N, eig [] indicates feature in formula
Root analytic function, λiIt is expressed as ith feature root, wherein smallest real eigenvalue is expressed as λmin=min { λ1,λ2,…,λN}；
24) ratio for calculating other feature root and smallest real eigenvalue, is denoted as
25) defined variable Λ=[δ1,δ2,…,δN], when with threshold value ρ0When comparing, the characteristic root number greater than threshold value is exactly
Corresponding interference number chooses accessory channel number according to interference number.
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| CN111245455A (en) * | 2020-02-19 | 2020-06-05 | 北京紫光展锐通信技术有限公司 | Dynamic interference suppression method for receiver, receiver system and storage medium |
| CN111337886B (en) * | 2020-03-23 | 2022-01-25 | 中国人民解放军空军工程大学 | Radar interference suppression method and device based on channel ratio function and electronic equipment |
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| JPS59171540A (en) * | 1983-03-18 | 1984-09-28 | 富士通株式会社 | Measurement utilizing spectrum shape |
| AU2001282275A1 (en) * | 2000-08-11 | 2002-02-25 | Alenia Marconi Systems Limited | Method of interference suppression in a radar system |
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