CN109884598A - A kind of radio frequency shielding method, apparatus and computer equipment - Google Patents
A kind of radio frequency shielding method, apparatus and computer equipment Download PDFInfo
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Abstract
The present invention is suitable for field of computer technology more particularly to a kind of radio frequency shielding method, apparatus and computer equipment.A kind of radio frequency shielding method specifically includes: obtaining the received target radar returns signal of the first receiving channel and the received external interference signal of the second receiving channel；Digitized processing is carried out to the external interference signal, and signature analysis is carried out to external interference signal after digitized processing, obtains the attribute functional character information of the external interference signal；Interference analysis result is determined according to the attribute functional character information of the external interference signal and the attribute functional character information of target radar returns signal；It screens the timing of tranmitting frequency and radar emission signal to be adjusted radio frequency according to the interference analysis result, carries out radio frequency shielding transmitting.This method is adjusted Anti-interference Strategy, the intelligence for realizing radar radio frequency shielding system is anti-interference by obtaining external interference signal in real time and carrying out cognitive analysis to it.
Description
Technical field
The present invention relates to field of computer technology more particularly to a kind of radio frequency shielding method, apparatus and computer equipment.
Background technique
Radio frequency shielding is a kind of active and Intended radiation electromagnetic signal to cheat or upset hostile electromagnetic detection and detect receipts and set
It is standby, consume enemy's operating resources, a kind of tactics technology behavior that protection one's own side equipment, personnel and electromagnetic information are taken safely.
Radar with radio frequency shielding function emits the radio frequency shielding of other frequencies usually before working signal
Signal is used for deception jammer, if jammer is when receiving radio frequency shielding signal, it is believed that it is radar working signal, will
Radio frequency shielding signal is interfered；And radar does not handle radio frequency shielding signal when signal processing, and only handle work
Signal, therefore have the function of confusion jamming machine, eliminate interference.
But tradition has the radar of radio frequency shielding function, operating mode is fixed, such as: the pulse of front is covered for radio frequency
Signal f2 is protected, subsequent pulse is radar working signal f1.F1-f2 is fixed Δ f, and operating mode, which is easy disturbed machine, to be known
Not, thus it is disturbed.
Summary of the invention
The embodiment of the present invention is designed to provide a kind of radio frequency shielding method, it is intended to solve existing radio frequency shielding Working mould
The technical issues of formula is fixed, and disturbed machine identification is easy.
The embodiments of the present invention are implemented as follows, and a kind of radio frequency shielding method specifically includes,
Obtain the received target radar returns signal of the first receiving channel and the received external interference letter of the second receiving channel
Number；
Digitized processing is carried out to the external interference signal, and digitlization treated external interference signal is carried out special
Sign analysis, obtains the attribute functional character information of the external interference signal；
Attribute function according to the attribute functional character information of the external interference signal and target radar returns signal is special
Reference breath determines interference analysis result；
The timing of tranmitting frequency and radar emission signal is screened to be adjusted radio frequency according to the interference analysis result, into
The shielding transmitting of row radio frequency.
The another object of the embodiment of the present invention is to provide a kind of radio frequency shielding apparatus, specifically include:
Signal acquisition module, for obtaining the received target radar returns signal of the first receiving channel and the second receiving channel
Received external interference signal；
Signature analysis module, for carrying out digitized processing to the external interference signal, and to digitized processing
External interference signal afterwards carries out signature analysis, obtains the attribute functional character information of the external interference signal；
Analysis module is interfered, for the attribute functional character information and target radar returns according to the external interference signal
The attribute functional character information of signal determines interference analysis result；And
Signal emission module screens tranmitting frequency and radar emission signal to radio frequency for analyzing result according to the interference
Timing be adjusted, carry out radio frequency shielding transmitting.
The another object of the embodiment of the present invention is to provide a kind of computer equipment, which is characterized in that including memory and
Processor is stored with computer program in the memory, when the computer program is executed by the processor, so that described
Processor executes the step of radio frequency shielding method.
A kind of radio frequency shielding method provided in an embodiment of the present invention passes through real-time reception external interference signal and target radar
Echo-signal, and signature analysis is carried out to extraneous interference signal, then by comparing to obtain with target radar returns signal
Interference analysis as a result, and according to interference analysis result real-time perfoming radio frequency shielding parameter be adjusted, realize radar shielding system
The intelligence of system is anti-interference, reaches optimal anti-jamming effectiveness.
Detailed description of the invention
Fig. 1 is the flow chart that a kind of radio frequency that the embodiment of the present invention one provides screens method；
Fig. 2 is the flow chart that a kind of radio frequency provided by Embodiment 2 of the present invention screens method；
Fig. 3 is the flow chart that a kind of radio frequency that the embodiment of the present invention three provides screens method；
Fig. 4 is the flow chart that a kind of radio frequency that the embodiment of the present invention four provides screens method；
Fig. 5 is a kind of flow chart for time and frequency domain characteristics analysis that the embodiment of the present invention five provides；
Fig. 6 is a kind of flow chart for spatial feature analysis that the embodiment of the present invention six provides；
Fig. 7 is a kind of flow chart for polarizing field signature analysis that the embodiment of the present invention seven provides；
Fig. 8 is a kind of structural block diagram for radio frequency shielding apparatus that the embodiment of the present invention eight provides；
Fig. 9 is a kind of structural block diagram for radio frequency shielding apparatus that the embodiment of the present invention nine provides.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
It is appreciated that term " first " used in this application, " second " etc. can be used to describe various elements herein,
But unless stated otherwise, these elements should not be limited by these terms.These terms are only used to by first element and another yuan
Part is distinguished.For example, in the case where not departing from scope of the present application, the first xx script can be known as the 2nd xx script,
And similarly, the 2nd xx script can be known as the first xx script.
As shown in Figure 1, can specifically include following steps in one embodiment it is proposed that a kind of radio frequency screens method:
Step S101, obtains the received target radar returns signal of the first receiving channel and the second receiving channel is received outer
Boundary's interference signal.
In the present embodiment, the channel characteristic and radar of the first receiving channel are matched by shielding transmitting characteristics of signals, use
In receiving target radar returns signal, the working frequency points covering radar of the second receiving channel it is all can frequency at working frequency points,
Bandwidth is the bandwidth of entire radar system, and the mode for receiving external interference signal includes that narrow band scanning formula or broadband instantaneously cover
Formula, when the available working frequency points of radar system are less, using narrow band scanning mode, when the available working frequency points of radar system compared with
It is more, using the instantaneous cover type in broadband.
Step S102 carries out digitized processing to the external interference signal, and believes external interference after digitized processing
Number carry out signature analysis, obtain the attribute functional character information of the external interference signal.
In an embodiment of the present invention, the external interference signal received is time, the continuous analog quantity of amplitude, is led to
Cross AD conversion process, specifically include sampling, holding, quantization and coding 4 processes, obtain the time and amplitude it is discrete number letter
Number；The attribute functional character information may include energy, time-frequency domain characteristic, Spatial characteristic and polarizing field characteristic, should
Understand, when carrying out the analysis of attribute functional character, can choose it is therein it is any it is several analyzed, for different categories
Sexual function feature carries out signature analysis by establishing different cognitive models, to obtain the attribute functional character of external interference signal
Information.
Step 103, according to the category of the attribute functional character information of the external interference signal and target radar returns signal
Sexual function characteristic information determines interference analysis result.
In an embodiment of the present invention, wherein the attribute functional character information Yu external interference of target radar returns signal are believed
Number characteristic information it is corresponding, for example the characteristic information of external interference signal obtained by step 102 includes time-frequency domain characteristic
When information and polarizing field characteristic information, need to obtain from target radar returns signal corresponding time-frequency domain characteristic information and
Polarizing field characteristic information, and corresponding comparative analysis is carried out, obtain the interference of the target radar returns signal of external interference signal
Degree, as interference analysis result.
Step S104, according to the interference analysis result to radio frequency screen the timing of tranmitting frequency and radar emission signal into
Row adjustment carries out radio frequency shielding transmitting.
In an embodiment of the present invention, radio frequency shielding tranmitting frequency includes radar operating frequency and false shielding signal frequency
Rate is believed according to interference signal attribute functional characteristic information and the attributive character of target radar returns signal in interference analysis result
Breath, it is known that the range of interfering frequency, or the frequency that the biggish frequency of interference is weaker with interference, so that selection is suitable
The frequency of radar operating frequency and false shielding signal；Wherein the timing of radar emission signal specifically includes two ways, i.e., " empty
Dummy screen signal+by shielding signal ", " falseness shielding signal+by shielding signal+falseness shielding signal ", pass through interference analysis knot
Fruit determines the concrete mode of the timing of radar signal；According to the radar operating frequency of above-mentioned determination, false shielding signal frequency with
And the timing of radar signal carries out radio frequency shielding transmitting.
It should be understood that radar system works continual, signal is acquired in real time, and is constantly carried out
The analysis of external interference signal carries out the real-time adjustment of corresponding shielding parameter based on interference analysis result, which is one
The cyclic process of closed loop keeps radar shielding process to have flexible initiative.
The radio frequency screens method to pass through the echo-signal of real-time reception external interference signal and target radar, and does to the external world
It disturbs signal and carries out signature analysis, then by comparing to obtain interference analysis as a result, simultaneously according to dry with target radar returns signal
It disturbs analysis result progress radio frequency shielding parameter to be adjusted, the intelligence for realizing radar shielding system is anti-interference, reaches best
Anti-jamming effectiveness.
In one embodiment, as shown in Fig. 2, providing a kind of radio frequency shielding method, following steps be can specifically include:
Wherein step S201-S204 is identical as the step S101-104 in upper one embodiment, main extraneous by obtaining
The echo-signal of interference signal and target radar, and pass through the echo-signal of the signature analysis of external interference signal and target radar
It combines, obtains interference analysis and adjust as a result, carrying out shielding parameter again and carry out shielding radiation.
Radio frequency adjusted is screened the timing of tranmitting frequency and radar emission signal anti-interference as one by step S205
Scheme is stored.
In an embodiment of the present invention, Anti jamming Scheme specifically includes: radar operating frequency in radio frequency shielding, falseness shielding
Radio frequency adjusted is screened tranmitting frequency and radar emission signal by the timing of signal frequency and the above two signal of radar emission
Timing stored as a jamming program, and be identified, the method for being specifically identified can be to carry out Anti jamming Scheme
It numbers or is named.It should be understood that being received in real-time signal and after anti-Interference Analysis, carrying out radio frequency shielding parameter
Adjustment, multiple Anti jamming Schemes can be obtained, to obtain an anti-interference knowledge base, while Anti jamming Scheme can be carried out
Anti-jamming evaluation existing anti-interference knowledge is updated according to the preferable scheme of anti-jamming evaluation effect selection anti-jamming effectiveness
Library.
This method can form anti-interference knowledge base by joined the storage of Anti jamming Scheme, can be in current radio frequency
In the case where screening parameter anti-jamming effectiveness bad, the preferable scheme of anti-jamming effectiveness is called directly from anti-interference knowledge base,
Improve anti-jamming effectiveness.
In one embodiment, as shown in figure 3, step S102 can specifically include following steps:
The external interference signal is carried out digitized processing, to obtain digitized processing interference signal by step S301.
In an embodiment of the present invention, the external interference signal received is time, the continuous analog quantity of amplitude, is led to
Cross AD conversion process, specifically include sampling, holding, quantization and coding 4 processes, obtain the time and amplitude it is discrete number letter
Number, to obtain the interference signal of digitized processing.
Step S302 carries out frequency band division to the digitized processing interference signal according to preset frequency partition rule,
Multiple narrow-band interference signals are obtained, the narrow-band interference signal is subjected to time and frequency domain characteristics analysis according to scheduled cognitive model,
Obtain external interference signal time-frequency domain characteristic information.
In an embodiment of the present invention, external interference signal is believed according to frequency partition rule set by user by number
Roadization carries out frequency band division, obtains multiple narrow-band interference signals, it should be appreciated that when the external interference signal of acquisition is narrowband
Infection signal can then save above-mentioned steps.Then the multiple narrow-band interference signal is carried out according to Fourier transformation model outer
The Time-Frequency Analysis of boundary's interference signal obtains the Fourier transformation set of interference signal, so that it is determined that external interference signal when
Frequency domain characteristic information.
The digitized processing interference signal is carried out Spatial characteristic and polarization according to scheduled cognitive model by step S303
Characteristic of field analysis, obtains external interference signal Spatial characteristic information and external interference polarizations domain characteristic information.
In embodiments of the present invention, different attribute functional character analyses are directed to and use different cognitive models, when obtaining
After digitized processing interference signal, be directed to the analysis of the Spatial characteristic of external interference signal, can using beam search method,
Adjacent amplitude comparision method, phase method, any one in MUSIC (Multiple Signal Classification) algorithm carry out special
Sign analysis, obtain Spatial characteristic information, be directed to the polarizing field signature analysis of external interference signal, can using signal phasor into
Row analysis obtains polarizing field characteristic information.
Time that this method will acquire, the continuous external interference signal of amplitude are obtained by suitable digitalized processing method
Different characteristic analysis model is able to carry out the signal data of signature analysis, and carries out external interference signal by different models
Signature analysis obtains the characteristic information of multiple external interference signals, provides sufficient data for subsequent interference analysis.
In one embodiment, step S103 can specifically include following steps:
In an embodiment of the present invention, by the attribute functional character information and target radar returns of the external interference signal
The attribute functional character information of signal compares, and obtains the external interference signal and target radar returns signal time-frequency domain is special
Property information, the overlapping region of Spatial characteristic information and polarizing field characteristic information and Non-overlapping Domain, with determine interfere analyze result.
The step is obtained by comparing the attribute functional character information of external interference signal and target radar returns signal
The annoyance level of echo signal, in order to the adjustment of radio frequency shielding parameter.
In one embodiment, as shown in figure 4, step S104 can specifically include following steps:
Step S401, according to the interference analysis as a result, selecting to interfere most weak frequency as radar operating frequency, selection
The frequency of 1GHz or more is differed with the radar operating frequency as false shielding signal frequency, and determines the radar work frequency
The timing of rate and the false shielding signal frequency.
In an embodiment of the present invention, according to interference analysis as a result, obtaining each available work frequency point of radar system same
The size for the degree that hand interferes in one period, and believe in this, as the selection of radar emission signal frequency, adjustment and time division emission
The foundation of number timing selection, by the radar available work frequency point that select interference most weak as radar operating frequency, simultaneous selection
The frequency of 1GHz or more is differed with the radar operating frequency as false shielding signal frequency.It should be understood that working as basis
The current radar radio frequency shielding parameter of interference analysis interpretation of result is not interfered, then does not need the phase to current radar system
It closes parameter to be changed, if current n interference environment has received serious influence to the performance of radar system, directly according to above-mentioned
Selection scheme carries out the shielding parameter adjustment of radar radio frequency.Wherein the timing of radar emission signal includes two ways, it may be assumed that " false
Shielding signal+by shielding signal ", " falseness shielding signal+by shielding signal+falseness shielding signal ", it is main to pass through interference analysis
As a result it is selected with the anti-jamming effect evaluation comprehensive analysis of different timing, obtains the optimal radar emission letter of anti-jamming effectiveness
Number timing.
Step S402 carries out radio frequency shielding hair according to the timing of the radar operating frequency and the false shielding signal
It penetrates.
In an embodiment of the present invention, carrying out radio frequency shielding transmitting includes two signal transmission channels, and one is radar work
Make signal transmission channel, for carrying out signal transmitting according to selected radar working signal frequency, the other is false shielding
Signal transmission channel, for carrying out shielding signal transmitting according to selected false shielding signal frequency, it should be appreciated that when
It when radar working signal frequency changes, needs to be adjusted the receiving channel parameter of receiving channel 1, sends out it with radar
The parameter for penetrating signal matches, and in order to receive the echo-signal of target radar, keeps the smooth connection between radar.
This method is adjusted the timing of radar operating frequency and radar emission signal according to interference analysis result, goes forward side by side
Row radio-frequency transmissions reach jamproof purpose by quick frequency error factor, and weightlessness keeps the flexible initiative of radar.
In one embodiment, as shown in figure 5, described carry out the narrow-band interference signal according to scheduled cognitive model
The step of time and frequency domain characteristics analysis, acquisition external interference signal time-frequency domain characteristic information, does not specifically include:
Step S501 establishes window function, and the narrow-band interference signal and the window function is combined and carry out Fourier
Transformation obtains signal Fourier transformation set.
Narrow-band interference signal is set as x (t), the STFT (Short Time Fourier Transform) of continuous domain is in short-term
Fourier transform definition is shown in formula (1):
STFTx(t, Ω)=∫ x (τ) g*(τ-t)e-jΩτdτ
=< x (τ), ht,Ω(τ)>
=< x (τ), g (τ-t) ejΩτ> (1)
Wherein g*(τ-t) is window function,<x, y>expression signal x and y inner product, it may be assumed that
<x, y>=∫ x (t) y*(t)dt (2)
The expression of Fourier transformation are as follows:
FTx(Ω)=∫ x (τ) e-jΩτdτ (3)
To obtain the form such as formula (4) of the Fourier transformation containing window function.
STFTx(t, Ω)=∫ x*(τ)e-jΩτdτ
=∫ x (τ) g*(τ-t)e-jΩτdτ (4)
Can be obtained by formula (4): STFT can be considered does Fourier transformation to after narrow-band interference signal adding window again.Window function g (τ) is
Symmetric function, and be finite support in time domain.By constantly moving the position of window function, Fourier transformation is carried out, can be obtained
A series of set of signal Fourier transformation after different time sections interceptions.
Step S502 determines interference signal time-frequency domain characteristic information according to the Fourier transformation set.
In an embodiment of the present invention, the time-frequency domain characteristic information can be divided into time domain specification information and frequency domain characteristic
Information, the Fourier transformation set are the two-dimensional functions about time t and angular frequency Ω, are in the window function time domain of STFT
Finite support, to obtain the time domain specification information of external interference signal, and the temporal resolution of STFT has the time domain of window function
Width determines, so that it is determined that the frequency domain characteristic information of external interference signal.
Using above-mentioned Short Time Fourier Transform model can to high dynamic and non-stationary external interference signal when
Frequency domain characteristic carries out quick cognitive analysis, obtains the time-frequency domain characteristic information of external interference signal, mentions for subsequent interference analysis
Accurate time-frequency domain characteristic information data are supplied.
In one embodiment, as shown in fig. 6, described interfere the digitized processing according to scheduled cognitive model is believed
Number carry out spatial feature analysis, obtain external interference signal Spatial characteristic information the step of, specifically include:
Step S601 establishes DOA (Direction-of-Arrival) mathematical model, and according to the interference signal and institute
It states mathematical model and obtains interference signal covariance matrix.
In an embodiment of the present invention, shown in the DOA mathematical model such as formula (5).
X=A (θ) s (t)+N (t) (5)
On the basis of DOA model, the covariance matrix of available external interference signal is shown in formula (6).
R=E [XXH]=AE [SSH]AH+δ2I=ARSAH+δ2I (6)
Wherein Rs is the covariance matrix of signal s (t), and since signal and noise are mutually indepedent, data covariance is decomposable
For signal subspace and noise subspace.
The interference signal covariance matrix is carried out feature decomposition, it is corresponding to obtain interference signal component by step S602
The signal subspace noise subspace mutually orthogonal with signal component.
In an embodiment of the present invention, feature decomposition is carried out according to formula (7) according to above-mentioned covariance matrix and to it, obtained
Obtain signal subspace and noise subspace.
R=USΣSUHS+UNΣNUHN (7)
Wherein USIt is by the subspace of the corresponding feature vector of big characteristic value, i.e. signal subspace.UNIt is by small feature
It is worth the subspace of corresponding characteristic vector, as noise subspace.Since signal subspace and noise subspace are mutual
Orthogonal, then the steering vector A of signal subspaceH(θ) and noise subspace UNIt is orthogonal, meet AH(θ)UN=0.
Step S603 determines interference signal Spatial characteristic information according to the signal subspace and noise subspace.
In an embodiment of the present invention, the array of the external interference signal received is limited, to obtainThen rightFeature decomposition is carried out, noise subspace characteristic vector is calculatedAnd carry out minimum
Change Optimizing Search, to obtain interference signal Spatial characteristic information.
Quick cognitive analysis is carried out using the airspace domain characteristic that above-mentioned MUSIC algorithm carries out external interference signal, is obtained outer
The Spatial characteristic information of boundary's interference signal provides accurate Spatial characteristic information data for subsequent interference analysis.
In one embodiment, as shown in fig. 7, described interfere the digitized processing according to scheduled cognitive model is believed
Number carry out polarizing field signature analysis, obtain external interference polarizations domain characteristic information the step of, specifically include:
Step 701, the field amplitude and horizontal amplitude of orthogonally polarized signal are obtained according to the external interference signal.
In an embodiment of the present invention, it according to external interference signal, is extracted from the interference signal relevant orthogonal
Polarized signal, and polarized signal progress vertical polarization and horizontal polarization are obtained into its field amplitude AhAnd horizontal amplitude.
Step 702, axis ratio tan α is obtained according to the field amplitude and horizontal amplitudepAnd phase differenceAnd according to formulaObtain polarization ratio.
In an embodiment of the present invention, field amplitude will be obtained to compare with horizontal amplitude, obtaining its ratio is axis ratio
tanαpAnd phase differenceThere is the polarization characteristic of type signal to identify that polarization pattern, main identical criterion are as shown in table 1 again.
The typical criterion of 1 polarization measurement of table and identification
And polarization ratio is obtained according to formula (8).
Wherein, SJh、SJvRespectively represent complex component of the interference signal on horizontal, vertical base.
Step 703, according to the plan than determining external interference signal phasor, as external interference polarizations domain
Characteristic information.
In an embodiment of the present invention, interference signal vector SJ, horizontal, vertical polarization base is (h, v), then according to polarization point
Solution theory can obtain:
Plan ratio ρ can be used further according to formula (8)hvInterference signal vector is indicated, as shown in formula (10).
Wherein interference signal vector is denoted as the polarizing field characteristic information of external interference signal.
Quickly recognized using the polarizing field characteristic that above-mentioned Jones vector sum polarization ratio analyzes hair progress external interference signal
Know analysis, obtain the polarizing field characteristic information of external interference signal, provides accurate polarizing field characteristic for subsequent interference analysis
Information data.
As shown in figure 8, in one embodiment, providing a kind of radio frequency shielding apparatus, can specifically include signal acquisition
Module 810, signature analysis module 820 interfere analysis module 830, signal emission module 840.
Signal acquisition module 810 is received for obtaining the received target radar returns signal of the first receiving channel and second
The external interference signal of channel reception.
In embodiments of the present invention, signal acquisition module by with the first receiving channel and the second receiving channel communication link
It connects, obtains the coherent signal that the two is received.The channel characteristic of first receiving channel emits characteristics of signals phase by shielding with radar
Matching, for receiving target radar returns signal, the working frequency points covering radar of the second receiving channel is all can be at working frequency points
Frequency, bandwidth be entire radar system bandwidth, receive external interference signal mode include narrow band scanning formula or broadband
Instantaneous cover type, when the available working frequency points of radar system are less, using narrow band scanning mode, when the available work of radar system
It is more to make frequency point, using the instantaneous cover type in broadband.
Signature analysis module 820, for the external interference signal carry out digitized processing, and to digitlization at
External interference signal carries out signature analysis after reason, obtains the attribute functional character information of the external interference signal.
In an embodiment of the present invention, signature analysis module carries out number to the external interference signal received first
Change processing specifically includes 4 sampling, holding, quantization and coding processes, obtains time and amplitude mainly by AD conversion process
Discrete digital signal；The attribute functional character information may include energy, time-frequency domain characteristic, Spatial characteristic and polarization
Domain characteristic, it should be appreciated that when carrying out the analysis of attribute functional character, can choose it is therein it is any it is several analyzed,
Signature analysis is carried out by establishing different cognitive models for different attribute functional characters, to obtain external interference signal
Attribute functional character information.
Analysis module 830 is interfered, for the attribute functional character information and target radar according to the external interference signal
The attribute functional character information of echo-signal determines interference analysis result.
In an embodiment of the present invention, wherein the attribute functional character information Yu external interference of target radar returns signal are believed
Number characteristic information to correspondence, such as by signature analysis module 820 obtain external interference signal characteristic information packet
When including time-frequency domain characteristic information and polarizing field characteristic information, need to obtain corresponding time-frequency from target radar returns signal
Domain characteristic information and polarizing field characteristic information, and corresponding comparative analysis is carried out, the target radar for obtaining external interference signal returns
The annoyance level of wave signal, as interference analysis result.
Signal emission module 840 screens tranmitting frequency and radar emission to radio frequency for analyzing result according to the interference
The timing of signal is adjusted, and carries out radio frequency shielding transmitting.
In an embodiment of the present invention, radio frequency shielding tranmitting frequency includes radar operating frequency and false shielding signal frequency
Rate is believed according to interference signal attribute functional characteristic information and the attributive character of target radar returns signal in interference analysis result
Breath, it is known that the range of interfering frequency, or the frequency that the biggish frequency of interference is weaker with interference, so that selection is suitable
The frequency of radar operating frequency and false shielding signal；Wherein the timing of radar emission signal specifically includes two ways, i.e., " empty
Dummy screen signal+by shielding signal ", " falseness shielding signal+by shielding signal+falseness shielding signal ", pass through interference analysis knot
Fruit determines the concrete mode of the timing of radar signal；According to the radar operating frequency of above-mentioned determination, false shielding signal frequency with
And the timing of radar signal carries out radio frequency shielding transmitting.
It should be understood that radar system works continual, signal acquisition module carries out signal real-time
Acquisition, and the analysis of external interference signal is constantly carried out, the real-time tune of corresponding shielding parameter is carried out based on interference analysis result
Whole, each mutually coordinated cooperation of module keeps radar shielding process tool so that radio frequency shielding process is the cyclic process of a closed loop
There is flexible initiative.
As shown in figure 9, in one embodiment, a kind of radio frequency shielding apparatus is provided, with device phase shown in Fig. 8
Than further including Anti jamming Scheme memory module 950, jamming program evaluation module 960.
Anti jamming Scheme memory module 950, for radio frequency adjusted screen tranmitting frequency and radar emission signal when
Sequence is stored as an Anti jamming Scheme.
In an embodiment of the present invention, which resists dry for storing the preferable Anti jamming Scheme of anti-jamming effectiveness
The scheme of disturbing specifically includes: radar operating frequency in radio frequency shielding, falseness shielding signal frequency and the above two signal of radar emission
Timing, screen the timing of tranmitting frequency and radar emission signal to make the radio frequency adjusted of signal emission module 840 for described
Stored, and be identified for a jamming program, the method for being specifically identified can for Anti jamming Scheme is numbered or
It is named.
Anti jamming Scheme evaluation module 960 comments Anti jamming Scheme for establishing anti-jamming effect evaluation model
Estimate, obtains the optimal Anti jamming Scheme of anti-jamming effectiveness.
In example in real time of the invention, wherein anti-jamming effect evaluation model is anti-interference probabilistic model, mainly according to user
It intercepts and captures radar emitter signal probability, correctly sort identification probability, standard in the jammer front end that input or big data analysis obtain
True Guiding probability is respectively as follows: Pk、Pj2、Pj3, radio frequency shielding radar is P by the probability of cheating interferencej, then radio frequency shielding is anti-interference
Probability is Pr=1-Pj=1-PkPj2Pj3.Finally, determining optimal Anti jamming Scheme by the size of anti-interference probability.
The radio frequency shielding apparatus receives in real-time signal and after anti-Interference Analysis, carries out the adjustment that radio frequency screens parameter,
Multiple Anti jamming Schemes can be obtained, to obtain an anti-interference knowledge base, are further carried out using evaluation module anti-interference
The anti-jamming evaluation of scheme updates existing anti-interference according to the preferable scheme of anti-jamming evaluation effect selection anti-jamming effectiveness
Knowledge base.
In an embodiment of the present invention, the present invention also provides a kind of computer equipment, including memory and processor, institutes
It states memory and is stored with computer program, the processor realizes the step of radio frequency shielding method when executing the computer program
Suddenly.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the program can be stored in a non-volatile computer and can be read
In storage medium, the program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein, provided herein
Each embodiment used in any reference to memory, storage, database or other media, may each comprise non-volatile
And/or volatile memory.Nonvolatile memory may include that read-only memory (ROM), programming ROM (PROM), electricity can be compiled
Journey ROM (EPROM), electrically erasable ROM (EEPROM) or flash memory.Volatile memory may include random access memory
(RAM) or external cache.By way of illustration and not limitation, RAM is available in many forms, such as static state RAM
(SRAM), dynamic ram (DRAM), synchronous dram (SDRAM), double data rate sdram (DDRSDRAM), enhanced SDRAM
(ESDRAM), synchronization link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) directly RAM (RDRAM), straight
Connect memory bus dynamic ram (DRDRAM) and memory bus dynamic ram (RDRAM) etc..
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of radio frequency screens method, which is characterized in that it specifically includes,
Obtain the received target radar returns signal of the first receiving channel and the received external interference signal of the second receiving channel；
Digitized processing is carried out to the external interference signal, and feature point is carried out to digitlization treated external interference signal
Analysis, obtains the attribute functional character information of the external interference signal；
Believed according to the attribute functional character of the attribute functional character information of the external interference signal and target radar returns signal
Breath determines interference analysis result；
It screens the timing of tranmitting frequency and radar emission signal to be adjusted radio frequency according to the interference analysis result, is penetrated
Frequency shielding transmitting.
2. radio frequency according to claim 1 screens method, which is characterized in that the method also includes:
The timing of tranmitting frequency and radar emission signal is screened to store as an Anti jamming Scheme radio frequency adjusted.
3. radio frequency according to claim 1 screens method, which is characterized in that described to be counted to the external interference signal
Wordization processing, and signature analysis is carried out to external interference signal after digitized processing, obtain the attribute of the external interference signal
The method of functional character information, specifically includes:
The external interference signal is subjected to digitized processing, to obtain digitized processing interference signal；
Frequency band division is carried out to the digitized processing interference signal according to preset frequency partition rule, it is dry to obtain multiple narrowbands
Signal is disturbed, the narrow-band interference signal is subjected to time and frequency domain characteristics analysis according to scheduled cognitive model, obtains external interference letter
Number time-frequency domain characteristic information；
The digitized processing interference signal is subjected to Spatial characteristic and polarizing field signature analysis according to scheduled cognitive model, is obtained
Obtain external interference signal Spatial characteristic information and external interference polarizations domain characteristic information.
4. radio frequency according to claim 1 screens method, which is characterized in that the category according to the external interference signal
The attribute functional character information of sexual function characteristic information and target radar returns signal determines the step of interference analysis result, specifically
Include:
By the attribute functional character information of the attribute functional character information of the external interference signal and target radar returns signal
Compare, obtain the external interference signal and each attribute functional character information of target radar returns signal overlapping region and
Non-overlapping Domain analyzes result to determine to interfere.
5. radio frequency screens method according to claim 1, which is characterized in that described to analyze result to radio frequency according to the interference
The step of shielding tranmitting frequency and the timing of radar emission signal are adjusted, and carry out radio frequency shielding transmitting, specifically includes:
According to the interference analysis as a result, selecting to interfere most weak frequency as radar operating frequency, selection and the radar work
Working frequency differs the frequency of 1GHz or more as false shielding signal frequency, and determines the radar operating frequency and the falseness
Screen the timing of signal frequency；
According to the timing of the radar operating frequency and the false shielding signal, radio frequency shielding transmitting is carried out.
6. radio frequency according to claim 3 screens method, which is characterized in that it is described will be described according to scheduled cognitive model
The step of narrow-band interference signal carries out time and frequency domain characteristics analysis, obtains external interference signal time-frequency domain characteristic information, specifically includes:
Window function is established, and the narrow-band interference signal and the window function are combined into carry out Fourier transformation, obtains signal
Fourier transformation set；
Interference signal time-frequency domain characteristic information is determined according to the Fourier transformation set.
7. radio frequency according to claim 3 screens method, which is characterized in that it is described will be described according to scheduled cognitive model
The step of digitized processing interference signal carries out spatial feature analysis, obtains external interference signal Spatial characteristic information, it is specific to wrap
It includes:
DOA mathematical model is established, and interference signal covariance matrix is obtained according to the interference signal and the mathematical model；
The interference signal covariance matrix is subjected to feature decomposition, obtain the corresponding signal subspace of interference signal component and
The mutually orthogonal noise subspace of signal component；
Interference signal Spatial characteristic information is determined according to the signal subspace and noise subspace.
8. radio frequency according to claim 3 screens method, which is characterized in that it is described will be described according to scheduled cognitive model
The step of digitized processing interference signal carries out polarizing field signature analysis, obtains external interference polarizations domain characteristic information, tool
Body includes:
The field amplitude and horizontal amplitude of orthogonally polarized signal are obtained according to the external interference signal；
Axis ratio tan α is obtained according to the field amplitude and horizontal amplitudepAnd phase differenceAnd according to formulaObtain polarization ratio；
According to the plan than determining external interference signal phasor, as external interference polarizations domain characteristic information.
9. a kind of radio frequency shielding apparatus, which is characterized in that specifically include:
Signal acquisition module is received for obtaining the received target radar returns signal of the first receiving channel and the second receiving channel
External interference signal；
Signature analysis module, for carrying out digitized processing to the external interference signal, and treated to digitlization
External interference signal carries out signature analysis, obtains the attribute functional character information of the external interference signal；
Analysis module is interfered, for the attribute functional character information and target radar returns signal according to the external interference signal
Attribute functional character information determine interference analysis result；And
Signal emission module, for according to the interference analysis result to radio frequency screen tranmitting frequency and radar emission signal when
Sequence is adjusted, and carries out radio frequency shielding transmitting.
10. a kind of computer equipment, which is characterized in that including memory and processor, be stored with computer in the memory
Program, when the computer program is executed by the processor, so that the processor perform claim requires any one of 1 to 8
Radio frequency described in claim screens the step of method.
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