CN106950547A - A kind of composite interference method based on extension Radar Echo Parameters time-varying - Google Patents
A kind of composite interference method based on extension Radar Echo Parameters time-varying Download PDFInfo
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- CN106950547A CN106950547A CN201710337920.6A CN201710337920A CN106950547A CN 106950547 A CN106950547 A CN 106950547A CN 201710337920 A CN201710337920 A CN 201710337920A CN 106950547 A CN106950547 A CN 106950547A
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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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
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Abstract
The invention discloses a kind of composite interference method for extending Radar Echo Parameters time-varying, the interference method includes being expanded back into Bomi collection false target jamming profile signal and noise jamming, and signal echo parameter time-varying type uses amplitude time-varying.Technical scheme includes：Produce decoy signal and noise interferences needed for radar chaff, by decoy signal and noise signal according to certain modulation system progress uniform modulation, the radar target signal that generation amplitude is changed over time, the signal modulated is launched by potato masher antenna, the influence that the interference is caused to the detection of the backscatter signal of radar is finally analyzed.There is the present invention the complicated echo electromagnetic environment of simulation, the echo-signal characteristic for modulating radar, interference system can flexibly load, it is adaptable to the interference to radar to echo detecting.
Description
Technical field
The invention belongs to gate stealing field, more particularly, to a kind of answering based on extension Radar Echo Parameters time-varying
Close interference method.
Background technology
At present in radar chaff, for the jamming countermeasure of radar, mainly the secondary lobe of radar is disturbed, existing thunder
Up to the interference protection measure disturbed for this secondary lobe, including the measure such as sidelobe cancellation and side-lobe blanking is also provided, its is anti-interference
Effect is obvious.
For above-mentioned Anti-jamming Technology for Radar, radar chaff is taken at present the strong noise signal of with strong points, power or
The intensive decoy signal of person, however, the conflicting mode has following problems：Due to the finiteness of radar resource, radar receiver
It can not possibly carry out whole (repetition period) offseting in sampling, and the sampling that can only sample or sample in short-term, this causes signal transacting
Resource consumption is huge, and interference signal can not be sampled for a long time, so the interference signal used can not be received to radar
Machine is effectively disturbed.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the invention provides one kind based on extension Radar Echo Parameters time-varying
Composite interference method, it is intended that the interference signal for solving to use in existing radar chaff method can not be received to radar
The technical problem that machine is effectively disturbed.
To achieve the above object, according to one aspect of the present invention there is provided a kind of based on extension Radar Echo Parameters time-varying
Composite interference method, comprises the following steps：
(1) intensive false target jamming profile signal is produced using digital frequency memory technique；
(2) FM Noise Jamming Signal is generated.
(3) echo-signal of radar is modulated by Si Weilin models so that the FM Noise Jamming Signal of generation
Entered with intensive false target jamming profile signal with complicated echo shaping in radar receiver, disturbed with producing extension Radar Echo Parameters time-varying
Signal；
(4) the extension Radar Echo Parameters time-varying interference signal of acquisition is modulated in the echo-signal of radar, to obtain target
Echo model.
Preferably, it is to generate intensive false target jamming profile using directly storage forwarding or duplication stacked system to believe in step (1)
Number.
Preferably, the FM Noise Jamming Signal in step (2) is：
Wherein u (t) represents zoop,For be uniformly distributed in [0,2 π] and with u (t) mutually independent random variables,
UjRepresent the range value of interference signal, ωjRepresent the modulation angular frequency of interference signal, KFMRepresent chirp rate.
Preferably, the Si Weilin model mesorelief characterisitic parameters of step (3) are generated by procedure below：
(1) [0,1] equally distributed random number u is obeyed in generation；
(2) variances sigma is generated according to random number u：σ=- σavLn (1-u), wherein σavThe echo sectional area of target is represented, its
Value is 0.5m2~1m2；
(3) the fluctuation characteristic parameter of target is obtained according to random number u and variances sigma
Preferably, the echo model of moving target is in step (4)：
ψ (t)=KGJ (t) (t- τ0)exp[j2π(f0+fd)(t-τ0)]
Wherein G represents the antenna gain of radar, represents the distance delay of the echo-signal of radar, represents the echo letter of radar
Number frequency, fdFrequency displacement of the echo-signal relative to radar emission signal of radar is represented, that reflects between target and radar
Relative motion；τ0Time delay is represented, that reflects the position relationship between target and radar.
In general, by present inventive concept, following beneficial effect can be obtained：
In general, by the contemplated above technical scheme of the present invention compared with prior art, it can obtain down and show
Beneficial effect：
The present invention believes as a result of niose-modulating-frenquency jamming and the compound output of intensive false target jamming profile, and in the echo of radar
The mode for carrying out Si Weilin modulation in number is disturbed radar, and radar gathers signal in flyback under regular situation, and trace is carried out
Offset, when being disturbed using this, because noise FM adjusts the modulating bandwidth of whole interference signal, intensive decoy causes radar inverse
Journey sample is more, and carries out Si Weilin amplitude adjustment in echo-signal, radar receiver is completed in time
Trace is offseted so that secondary lobe disturbs failure, can not be to radar secondary lobe therefore, it is possible to the interference signal that solves to use in existing method
The technical problem effectively disturbed.
Brief description of the drawings
Fig. 1 is generation and the interference principle schematic diagram of intensive decoy.
Fig. 2 is that noise jamming produces procedure chart.
Fig. 3 is the design and analogous diagram of FM Noise Jamming Signal.
Fig. 4 is Radar Echo Parameters amplitude time-varying figure.
Fig. 5 is the echo-signal secondary lobe Interference Detection figure of radar.
Fig. 6 is the flow chart of composite interference method of the present invention based on extension Radar Echo Parameters time-varying.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
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.As long as in addition, technical characteristic involved in each embodiment of invention described below
Not constituting conflict each other can just be mutually combined.
As shown in fig. 6, composite interference method of the present invention based on extension Radar Echo Parameters time-varying comprises the following steps：
Step 1, digital frequency memory technique is utilized to produce intensive false target jamming profile signal；
Fig. 1 produces schematic diagram for the intensive decoy of the present invention, and system detects receipts by AD completion signals, and carries out phase
Pass process processing, completes the delay superposition of signal, and each signal is handled by the multiplier of certain coefficient, final logical
The output that high speed D/A completes interference signal is crossed, producing method analysis is carried out to the interference, according to the intensive decoy of radar signal
Cheating interference needs for further analysis to Radar Return.
Being intended that for generation false target jamming profile signal provides many from real goal apart from different decoys to radar, makes
Obtain radar system and cannot distinguish between true and false target, play the purpose of deception subject radar, or at least correct area of increase subject radar
Divide the difficulty of true and false target or delay it to identify the time of true target.
Specifically, two ways may be selected in this step and produces decoy, one kind is direct store-and-forward mode, it is a kind of
It is to replicate stacked system；
(1) direct store-and-forward mode
Jammer proceeds by pulse replication delay forwarding, has forwarded one after a complete radar pulse is received
After complete pulse, then the 2nd pulse is forwarded, the rest may be inferred.Under this conflicting mode, if objects interfered is the narrow arteries and veins of transmitting
The radar of punching, then can form the false target jamming profile signal than comparatively dense；But if objects interfered is the thunder of transmitting broad pulse
Reach, then the interval between false target jamming profile signal can increase with the increase of pulsewidth, it is impossible to reach preferable interference effect.
(2) stacked system is replicated
Jammer is superimposed to the false target jamming profile signal of duplication in the enterprising line delay of time domain, and radar receives false target jamming profile
The laggard horizontal pulse compression processing of signal, is compressed into burst pulse, the decoy now formed will be than comparatively dense, and its is intensive by broad pulse
Degree is determined by the delay size between jammer copy pulse.Because jammer transmission power is certain, when the vacation of transmitting
When target jamming signal is overlapped in time domain, each false target jamming profile signal can only get a part of jamming power,
Therefore the energy of decoy can decrease relative to the transmission power of jammer.
The quantity of decoy and the quality of interference effect have very close contact.Decoy quantity is more, radar system
System is more to these false target jamming profile signals progress signal transacting, the data processing resource to be expended, and the interference to radar is imitated
Fruit is also better.
Step 2, generation FM Noise Jamming Signal；
FM Noise Jamming Signal is due to easily realizing wider jamming bandwidth and larger noise power, by appropriate place
Reason, can also obtain the more uniform power spectrum in the range of jamming bandwidth, therefore as the most frequently used in current noise jamming
Interference signal form.
Fig. 2 is the schematic diagram that noise jamming is produced, and gathering the related of signal by AD guides, and completes multiplying for digital noise
Plus, FM Noise Jamming Signal can carry out certain bandwidth modulation, finally export interference signal by high speed D/A.Noise jamming is a kind of
Power-type signal is disturbed, the Infinite Energy with limited power, so its frequency characteristic can only be characterized with power spectrum.Noise
Frequency modulation interference signal is a kind of random signal for carrier wave formed after amplitude modulation with noise.It can be used to as radar covering type
A kind of form of interference signal.FM Noise Jamming Signal is a kind of most suppression jamming signal form of current application, it
With wide jamming bandwidth and larger noise power, and pass through proper treatment, can also obtain in the range of jamming bandwidth compared with
Uniform power spectrum.
Preferable white noise has uniform infinite frequency spectrum, and actual white noise then only exists positive frequency component, by white noise
The interference signal that sound is formed after amplifying through radio frequency.Due to the finite bandwidth of amplifier, make band limited white noise, its bandwidth by
Amplifier bandwidth is determined.
Fig. 3 is the band limited white noise interference signal schematic diagram produced, the white noise spectrum of required bandwidth can be produced, with reference to this
Figure can carry out formula description.
The expression formula of FM Noise Jamming Signal is：
In above formula, u (t) represents zoop, and it is zero-mean, the random process of extended stationary,To be uniform in [0,2 π]
Distribution and with u (t) mutually independent random variables, UjRepresent the range value of interference signal, ωjRepresent the modulation angle of interference signal
Frequency, two values are constant, KFMRepresent chirp rate.
Commonly referred to as mfe=KFMσn/ΔFnReferred to as effective frequency modulation index (FM index), Δ FnFor zoop u (t) bandwidth,For modulation
Noise u (t) variance.
As mfe ＜ 1, jamming bandwidth is narrower, and jamming bandwidth is decided by KFM、With zoop bandwidth △ Fn, therefore can be with
It is used as arrowband spot jamming；As mfe ＞ 1, very big jamming bandwidth is can obtain, because jamming bandwidth and zoop
Bandwidth is unrelated, is decided by the power of zoop, therefore can be used as broadband barrage jamming.
FM Noise Jamming Signal is due to easily realizing wider jamming bandwidth and larger noise power, by appropriate place
Reason, can also obtain the more uniform power spectrum in the range of jamming bandwidth, therefore as the most frequently used in current noise jamming
Interference signal form.
Step 3, by Si Weilin models the echo-signal of radar is modulated so that the niose-modulating-frenquency jamming letter of generation
Number and intensive false target jamming profile signal entered with complicated echo shaping in radar receiver, realize extension Radar Echo Parameters time-varying interference
The generation of signal.
For being not added with the too simple interference signal of amplitude modulation(PAM) or modulation waveform, radar receiver is easy to calculate properly
Offset weighted vector, realization is offseted；For relative complex amplitude modulation(PAM) waveform, radar receiver is right within a bit of time
The weights that interference signal sampling is calculated, decoy realization that can only be close to fraction amplitude is offseted, and offsets effect variation.
That is, amplitude modulation(PAM) waveform is more complicated, and the weight computing of radar receiver is more difficult, offsets that effect is poorer, and interference effect is got over
It is good.
Echo-signal for radar is modulated, and mainly the glint characteristic to target is modulated, main bag
Include the factors such as attitude angle, shape, size, structure, radar frequency and the polarization mode of target echo.Due to the probability of target fluctuation
Density function and correlation function are difficult to be described with accurate mathematic(al) representation, so generally using some Mathematical Modelings in engineering
Carry out approximate representation.
It is Si Weilin (Swerling) model that the most frequently used target modulation, which sets up model,.Si Weilin models mainly include this prestige
Woods I~IV pattern types, is mainly analyzed I types and II pattern types below, completes intensive false target jamming profile signal and noise is adjusted
The amplitude modulation(PAM) output of frequency signal.
The types of Si Weilin I：It is applied to the target for having multiple uniform independent scattering sub-portfolios.Its fluctuation characteristic is slow fluctuating,
Single pass changes according to certain rules to its echo amplitude is scanned next time.Its typical target flies for miniature jet formula
Machine.
The types of Si Weilin II：It is applied to the target for having multiple uniform independent scattering sub-portfolios.Its fluctuation characteristic is fast fluctuating,
It between the echo impulse obtained by each scanning is all to rise and fall that feature, which is, and pulse is independent to pulse.Its typical mesh
It is designated as propeller aeroplane, helicopter, rain clutter and land clutter.
The radar cross section of target, which rises and falls, obeys exponential distribution：
σ=- σavln[1-u]
In formula, u obeys being uniformly distributed for [0,1], and it is σ that σ, which obeys average,avExponential distribution.As shown in figure 4, being target thunder
Up to sectional area scintillation index distributed simulation figure.
The generating process of random number sequence (i.e. fluctuation characteristic parameter) is in Si Weilin models：
(1) [0,1] equally distributed random number u is obeyed in generation；
(2) variances sigma is generated according to random number u：σ=- σavLn (1-u), wherein σavThe echo sectional area of target is represented, its
Mainly determined by target type, main analog target of the invention is jet plane, helicopter, propeller aeroplane and ground
Clutter and sea clutter, σavValue is from 0.5m2~1m2。
(3) the fluctuation characteristic parameter of target is obtained according to random number u and variances sigma
Modulated, after the fluctuation characteristic parameter K for forming target, joined using the fluctuation characteristic by both Si Weilin model
Number K is modulated to the echo-signal of radar, and FM Noise Jamming Signal and intensive false target jamming profile signal carry out complex superposition
Modulation, finally enters radar receiver with complicated echo shaping, forms extension Radar Echo Parameters time-varying interference signal.
4th, the extension Radar Echo Parameters time-varying interference signal of acquisition is modulated in the echo-signal of radar, to obtain target
Echo model, for disturbing radar formation.
Specifically, this step is to complete to believe extension Radar Echo Parameters time-varying interference using coherent video analogy method
Number modulated process.
The echo model of moving target can be expressed as：
ψ (t)=KGJ (t) (t- τ0)exp[j2π(f0+fd)(t-τ0)]
Wherein G represents the antenna gain of radar, and K represents the fluctuation characteristic parameter of target, and G and K reflect target echo
Amplitude size, represents the distance delay of the echo-signal of radar, represents the frequency of the echo-signal of radar, fdRepresent returning for radar
Ripple signal is relative to the frequency displacement of radar emission signal, and that reflects the relative motion between target and radar；τ0The expression time prolongs
Late, that reflects the position relationship between target and radar；In motion echo model, while by the noisy modulated signal of generation
Radiate, simultaneously because intercept replicate superposition, radar range dimension on form intensive false target jamming profile, to radar shape
Into interference.
The interference of radar secondary lobe is tested and analyzed by Fig. 5, the common practice of radar receiver is in flyback (stand-down)
Interference signal sample is gathered, realizes and offsets in trace (work phase), so as to play a part of suppressing interference signal.With electronic warfare
Radar is understood in depth, by constantly obtaining radar information in rivalry-drilling, be the analysis found that, is implementing the mistake of interference
Cheng Zhong, does not launch interference signal or flyback in radar flyback and trace transmitting interference signal is inconsistent so that by general radar
Valve offsets effect and declined.
Radar constantly carries out interactive development with electronic warfare in antagonistic process, and advanced sidelobe cancellation technology is
Through can in trace to interference signal in sampling while offset, sidelobe cancellation effect is highlighted, the interference effect of above-mentioned conflicting mode
It is decreased obviously.
The present invention has advantages below by the way of composite interference：
1st, to radar formation, targetedly compacting is disturbed, and snr loss is caused to detections of radar signal, it is found that target is general
Rate declines；
2nd, to radar formation cheating interference, radar is difficult to the echo-signal that distinguishes truth from false, and causes to radar intensive false mesh
Mark interference, increases search lighting, the difficulty of tracking；
3rd, FM Noise Jamming Signal and intensive false target jamming profile signal are formed not by numbers pile up, but by double
Passage DRFM carries out signal imitation, and noise interferences are synthesized with intensive false target jamming profile signal in space, by radar
Valve interference is more complicated, more effective.
4th, exported by Si Weilin modulation, be more nearly the echo signal approached so that radar can not be filtered out back effectively
Interference in ripple signal, easily forms interference.
5th, the composite interference can complete to disturb purpose to radar secondary lobe, radar receiver is constantly in busy state, no
Signal can be effectively recognized in the detection phase, cause powerful interference.
As it will be easily appreciated by one skilled in the art that the foregoing is only presently preferred embodiments of the present invention, it is not used to
The limitation present invention, any modification, equivalent and the improvement made within the spirit and principles of the invention etc., it all should include
Within protection scope of the present invention.
Claims (5)
1. a kind of composite interference method based on extension Radar Echo Parameters time-varying, it is characterised in that comprise the following steps：
(1) intensive false target jamming profile signal is produced using digital frequency memory technique；
(2) FM Noise Jamming Signal is generated.
(3) echo-signal of radar is modulated by Si Weilin models so that the FM Noise Jamming Signal of generation and close
Collect false target jamming profile signal with complicated echo shaping to enter in radar receiver, believed with producing the time-varying interference of extension Radar Echo Parameters
Number；
(4) the extension Radar Echo Parameters time-varying interference signal of acquisition is modulated in the echo-signal of radar, to obtain returning for target
Wave pattern.
2. composite interference method according to claim 1, it is characterised in that be using directly storage forwarding in step (1)
Or replicate the intensive false target jamming profile signal of stacked system generation.
3. composite interference method according to claim 1, it is characterised in that the FM Noise Jamming Signal in step (2)
For：
Wherein u (t) represents zoop,For be uniformly distributed in [0,2 π] and with u (t) mutually independent random variables, UjTable
Show the range value of interference signal, ωjRepresent the modulation angular frequency of interference signal, KFMRepresent chirp rate.
4. composite interference method according to claim 1, it is characterised in that the Si Weilin models mesorelief of step (3) is special
Property parameter is generated by procedure below：
(1) [0,1] equally distributed random number u is obeyed in generation；
(2) variances sigma is generated according to random number u：σ=- σavLn (1-u), wherein σavThe echo sectional area of target is represented, its value is
0.5m2~1m2；
(3) the fluctuation characteristic parameter of target is obtained according to random number u and variances sigma
5. composite interference method according to claim 4, it is characterised in that the echo model of moving target in step (4)
For：
ψ (t)=KGJ (t) (t- τ0)exp[j2π(f0+fd)(t-τ0)]
Wherein G represents the antenna gain of radar, represents the distance delay of the echo-signal of radar, represents the echo-signal of radar
Frequency, fdFrequency displacement of the echo-signal relative to radar emission signal of radar is represented, that reflects the phase between target and radar
To motion；τ0Time delay is represented, that reflects the position relationship between target and radar.
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Application publication date: 20170714 |