CN106443597B - Fight the adaptive anti-spoofing system and its anti-spoofing method of active decoy interference - Google Patents
Fight the adaptive anti-spoofing system and its anti-spoofing method of active decoy interference Download PDFInfo
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- CN106443597B CN106443597B CN201611109543.2A CN201611109543A CN106443597B CN 106443597 B CN106443597 B CN 106443597B CN 201611109543 A CN201611109543 A CN 201611109543A CN 106443597 B CN106443597 B CN 106443597B
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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
- G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures
Abstract
A kind of adaptive anti-spoofing system and its anti-spoofing method of the interference of confrontation active decoy, radar emission module generates according to radar signal parameter and emits deception pulse signal and true pulse signal, radar receiving module receives the active decoy interference signal of target echo signal and jammer transmitting simultaneously, after signal processing module carries out pulse pressure processing and detection to the signal received, calculate the difference of target gain and surrounding clutter or obstacle gain, adaptation algorithm block judges whether gain difference meets desired value, if meeting desired value, the radar signal parameter that the last period obtains is transferred to radar emission module, if being unsatisfactory for desired value, new radar signal parameter is calculated according to gain difference using adaptive algorithm and is transferred to radar emission module.The present invention destroys the correlation of interference, and interference effect is weakened from source, makes jammer that can not intercept and capture radar true pulse signal, improves anti-jamming effectiveness.
Description
Technical field
The present invention relates to electronic countermeasure field more particularly to a kind of adaptive anti-spoofing systems of confrontation active decoy interference
System and its anti-spoofing method.
Background technique
With the development of digital RF storage DRFM technology, active decoy interference is also more and more diversified, in addition to hardware
Common aliasing filtering generates false target jamming profile mode, the novel false target jamming profile of linear FM signal in
Smeared Spectrum (SMSP) and Chopping and Interleaving (C&I) interference is also come into being.It only leans at present
Radar controller empirically carries out artificial pressure point, is no longer satisfied the requirement of real-time and accuracy, so having to adopt
With intelligentized interference protection measure.
General confrontation false target jamming profile is from signal processing angle, as feature extraction, pattern-recognition, ambiguity function are known
Not etc..It is true can be used in distinguishing although there is many parameters that can identify interference type at present in terms of disturbance ecology
The parameter of real target and decoy is seldom, increasingly carrys out mature, false target jamming profile and true with digital RF memory technology
Correlation between real echo signal is also increasingly stronger, so it is relatively difficult for distinguishing false target jamming profile using recognition methods.
Anti-spoofing method is to be added to deception pulse from system design view, can weaken interference effect from source, is broken
The correlation of bad false target jamming profile, the gain that false target jamming profile obtains in pulse pressure processing can become very little.But enemy interferes
The time of intercept of machine can not determine, it is easy to just detect the actual signal for receiving radar emission, the effect of AF panel is unknown
It is aobvious.
Summary of the invention
The present invention provides the adaptive anti-spoofing system and its anti-spoofing method of a kind of confrontation active decoy interference, true
It is added to deception pulse signal before TRUE pulse signals, destroys the correlation of interference, interference effect is weakened from source, is added
Adaptive algorithm, according to the pulsewidth of the adaptive adjustment radar emission deception pulse signal of the detection result of radar return and very
The transmission interval of false pulse signal makes jammer that can not intercept and capture radar true pulse signal, and during radar pulse pressure, interference is just
It can be suppressed, the gain of true echo pulse signal just will increase, and improve anti-jamming effectiveness.
In order to achieve the above object, the present invention provides a kind of adaptive anti-spoofing system of confrontation active decoy interference,
Include:
Radar emission module, for deception pulse signal and true pulse letter to be generated and emitted according to radar signal parameter
Number；
Radar receiving module, for sampling the active decoy interference letter for receiving target echo signal and jammer transmitting
Number；
Signal processing module is electrically connected radar receiving module, for calculating target gain and surrounding clutter or interference
The difference of gain；
Adaptive algorithm module is electrically connected signal processing module and radar receiving module, for according to gain difference
New radar signal parameter is calculated and is transferred to radar emission module.
The radar emission module includes:
Waveform generator is electrically connected transmitting radar antenna and adaptive algorithm module, for radar based on the received
Signal parameter generates the radar emission waveform of deception pulse signal and true pulse signal；
Transmitting radar antenna, the deception pulse signal generated for transmitted waveform generator and true pulse signal.
The present invention also provides a kind of adaptive anti-spoofing methods of confrontation active decoy interference comprising the steps of:
Step S1, radar emission module generates according to radar signal parameter and emits deception pulse signal and true pulse letter
Number；
The radar signal parameter includes: cheating the pulsewidth of pulse signal, and deception pulse signal and true pulse
Transmission interval between signal；
Step S2, radar receiving module receives the active decoy interference letter of target echo signal and jammer transmitting simultaneously
Number it is sent to signal processing module；
Step S3, after signal processing module carries out pulse pressure processing and detection to the signal that receives, calculate target gain with
The difference of surrounding clutter or obstacle gain is sent to adaptive algorithm module；
Step S4, adaptation algorithm block judges whether gain difference is more than or equal to desired value, if so, the last period is obtained
To radar signal parameter be transferred to radar emission module, if not, being calculated using adaptive algorithm according to gain difference
New radar signal parameter is transferred to radar emission module.
The deception pulse signal and the correlation of true pulse signal are inconsistent.
The signal received is down-converted to intermediate frequency by radar receiving module, is transferred to signal processing module after sample quantization.
The pulse pressure processing is that radar return signal and the actual signal of radar emission are carried out matched filtering.
The detection is to carry out square-law or envelope detection, determines target arteries and veins using the thresholding that constant false alarm is handled
Punching.
The adaptive algorithm includes lms algorithm and recursive least squares.
The LMS algorithm comprises the steps of:
The poor e (n) of the gain difference y (n) of calculating desired value d (n) and actual feedback, i.e. e (n)=d (n)-y (n), wherein
N is time quantum, also illustrates that the number of iterations, and n 0,1,2..., n indicate initial value when being 0；
According to the new waveform parameter of the step size computation of setting, w (n)=w (n-1)+2ux (n) e*(n), wherein u is adaptive
Step-length, x (n) are the input signal that adaptive anti-spoofing system is equivalent to FIR filter structure, and w (n) is the power of filter
Value, i.e. the two of adaptive change waveform parameter.
The RLS algorithm comprises the steps of:
Set the initial value of p (n)；
It calculates gain factor k (n), i.e.,Wherein λ
For forgetting factor；
The poor e (n) of the gain difference y (n) of desired value d (n) and actual feedback is calculated, i.e.,
E (n)=d (n)-y (n)；
It calculates p (n), i.e. p (n)=λ-1p(n-1)-λ-1k(n)xH(n)p(n-1)；
Calculate new waveform parameter, w (n)=w (n-1)+k (n) e*(n)；
Wherein n is time quantum, also illustrates that the number of iterations, and n 0,1,2..., n indicate initial value when being 0.
The present invention is added to deception pulse signal before true pulse signal, the correlation of interference is destroyed, from source
Interference effect is weakened, joined adaptive algorithm, adaptive adjustment radar emission is taken advantage of according to the detection result of radar return
The pulsewidth of pulse signal and the transmission interval of true and false pulse signal are deceived, makes jammer that can not intercept and capture radar true pulse signal,
During radar pulse pressure, interference will be suppressed, and the gain of true echo pulse signal just will increase, and improve anti-interference effect
Fruit.
Detailed description of the invention
Fig. 1 is a kind of structure chart of the adaptive anti-spoofing system of confrontation active decoy interference provided by the invention.
Fig. 2 is a kind of flow chart of the adaptive anti-spoofing method of confrontation active decoy interference provided by the invention.
Specific embodiment
Below according to FIG. 1 to FIG. 2, presently preferred embodiments of the present invention is illustrated.
As shown in Figure 1, the present invention provides a kind of adaptive anti-spoofing system of confrontation active decoy interference, include:
Radar emission module 1, for deception pulse signal and true pulse letter to be generated and emitted according to radar signal parameter
Number；
Radar receiving module 2, for sampling the active decoy interference letter for receiving target echo signal and jammer transmitting
Number；
Signal processing module 3 is electrically connected radar receiving module 2, for calculating target gain and surrounding clutter or doing
Disturb the difference of gain；
Adaptive algorithm module 4 is electrically connected signal processing module 3 and radar receiving module 2, for according to gain inequality
Value is calculated new radar signal parameter and is transferred to radar emission module.
The radar signal parameter includes: cheating the pulsewidth of pulse signal, and deception pulse signal and true pulse
Transmission interval between signal.
The radar emission module 1 includes:
Waveform generator 102 is electrically connected transmitting radar antenna 101 and adaptive algorithm module 4, for according to reception
Radar signal parameter generate deception pulse signal and true pulse signal radar emission waveform；
Transmitting radar antenna 101, the deception pulse signal generated for transmitted waveform generator and true pulse signal.
As shown in Fig. 2, the present invention also provides it is a kind of confrontation active decoy interference adaptive anti-spoofing method, comprising with
Lower step:
Step S1, radar emission module generates according to radar signal parameter and emits deception pulse signal and true pulse letter
Number；
The radar signal parameter includes: cheating the pulsewidth of pulse signal, and deception pulse signal and true pulse
Interval between signal；Set the initial value of the radar signal parameter；
Radar signal parameter generates deception pulse signal and true based on the received for waveform generator in radar emission module
The radar emission waveform of TRUE pulse signals, transmitting radar antenna in radar emission module is by the deception pulse signal of generation and true
TRUE pulse signals are launched；
The true pulse signal uses linear FM signal, and the modulation format of the deception pulse signal should be protected
Card is inconsistent with the correlation of true pulse signal, and deception pulse signal can use single-frequency of the frequency point outside true pulse bandwidth
Signal, the linear FM signal different from the chirp rate of true pulse signal, pseudo noise code phase-modulated signal etc.；
Step S2, radar receiving module receives the active decoy interference letter of target echo signal and jammer transmitting simultaneously
Number it is sent to signal processing module；
The signal received is down-converted to intermediate frequency by radar receiving module, is transferred to signal processing module after sample quantization；
Jammer carries out replicating to forward generating active decoy after detecing the radar signal for receiving intercepting and capturing radar emission module transmitting
Interference signal；
Step S3, after signal processing module carries out pulse pressure processing and detection to the signal that receives, calculate target gain with
The difference of surrounding clutter or obstacle gain is sent to adaptive algorithm module；
The pulse pressure processing is that radar return signal and the actual signal of radar emission are carried out matched filtering, true mesh
It marks echo and the actual signal correlation of radar emission is strong, the target amplitude that pulse pressure obtains is big, but since what jammer was intercepted and captured is
Pulse is cheated, is to be interfered based on deception pulse release, the correlation for cheating pulse and true pulse is inconsistent, so in pulse pressure
In interference magnitude it is just small, play inhibit interference purpose；
The detection is to carry out square-law or envelope detection, determines target arteries and veins using the thresholding that constant false alarm is handled
Punching；
Feedback of the gain difference that signal processing module is calculated as adaptive algorithm module；
Step S4, adaptive algorithm module judges whether gain difference is more than or equal to desired value, if it is, carrying out step
S5, if it is not, then carrying out step S6；
Step S5, the radar signal parameter that the last period obtains is transferred to radar emission module by adaptive algorithm module,
Carry out step S1；
Step S6, adaptive algorithm module is calculated new radar signal according to gain difference using adaptive algorithm and joins
Number is transferred to radar emission module, carries out step S1；
Minimum Mean Square Error (LMS) algorithm and recurrence least square (RLS) algorithm can be used in the adaptive algorithm, will be certainly
It adapts to anti-spoofing system and is equivalent to FIR filter structure；
The LMS algorithm comprises the steps of:
The poor e (n) of the gain difference y (n) of calculating desired value d (n) and actual feedback, i.e. e (n)=d (n)-y (n), wherein
N is time quantum, also illustrates that the number of iterations, and n 0,1,2..., n indicate initial value when being 0；
According to the new waveform parameter of the step size computation of setting, w (n)=w (n-1)+2ux (n) e*(n), wherein u is adaptive
Step-length, adaptive step existBigger convergence rate is faster within the scope of this, and M is filter length, and Smax is
The maximum value of input power spectrum density, x (n) are the input signal that adaptive anti-spoofing system is equivalent to FIR filter structure,
W (n) is the weight of filter, i.e. [w1(n)w2(n)], it is two waveform parameters of adaptive change, cheats the arteries and veins of pulse signal
Transmission interval wide and between deception pulse signal and true pulse signal；
The convergence and stability of LMS algorithm are related with the step-length of setting, when the adaptive step of setting is bigger, target with
The speed that surrounding clutter or the gain inequality of interference converge to desired value is faster, but the bad stability of system, i.e. gain inequality exist
It is big that desired value oscillates about amplitude, when the too big algorithm of adaptive step will dissipate；
The RLS algorithm comprises the steps of:
Set the initial value of p (n)；
It calculates gain factor k (n), i.e.,Wherein λ be forget because
Son；
The poor e (n) of the gain difference y (n) of desired value d (n) and actual feedback is calculated, i.e.,
E (n)=d (n)-y (n)；
It calculates p (n), i.e. p (n)=λ-1p(n-1)-λ-1k(n)xH(n)p(n-1)；
Calculate new waveform parameter, w (n)=w (n-1)+k (n) e*(n)；
Wherein n is time quantum, also illustrates that the number of iterations, and n 0,1,2..., n indicate initial value when being 0；
The convergence of RLS algorithm is unrelated with step-length, and convergence rate is faster than LMS algorithm, but algorithm is complicated, computationally intensive；
Two kinds of adaptive algorithms respectively have advantage and disadvantage, need selection algorithm according to the actual situation, for the jammer time of intercept
In the case where variation infrequently, LMS algorithm can be used, change more for the jammer time of intercept and requires algorithmic statement fast
Spending in faster situation can choose RLS algorithm.
The present invention is added to deception pulse signal before true pulse signal, the correlation of interference is destroyed, from source
Interference effect is weakened, joined adaptive algorithm, adaptive adjustment radar emission is taken advantage of according to the detection result of radar return
The pulsewidth of pulse signal and the transmission interval of true and false pulse signal are deceived, makes jammer that can not intercept and capture radar true pulse signal,
During radar pulse pressure, interference will be suppressed, and the gain of true echo pulse signal just will increase, and improve anti-interference effect
Fruit.The present invention can also cope with the case where jammer detects the variation of receipts phase, even if jammer detects the variation of receipts phase, repeat week by several
Adaptive algorithm can adjust radar emission signal parameter after phase, and gain inequality is made to converge to desired value.
It is discussed in detail although the contents of the present invention have passed through above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read above content, for of the invention
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (8)
1. it is a kind of confrontation active decoy interference adaptive anti-spoofing system, characterized by comprising:
Radar emission module (1), for deception pulse signal and true pulse signal to be generated and emitted according to radar signal parameter；
Radar receiving module (2), for sampling the active decoy interference signal for receiving target echo signal and jammer transmitting；
Signal processing module (3) is electrically connected radar receiving module (2), for calculating target gain and surrounding clutter or doing
Disturb the difference of gain；
Adaptive algorithm module (4) is electrically connected signal processing module (3) and radar receiving module (2), for according to gain
Difference is calculated new radar signal parameter and is transferred to radar emission module.
2. the adaptive anti-spoofing system of confrontation active decoy interference as described in claim 1, which is characterized in that described
Radar emission module (1) includes:
Waveform generator (102) is electrically connected transmitting radar antenna (101) and adaptive algorithm module (4), connects for basis
The radar signal parameter of receipts generates the radar emission waveform of deception pulse signal and true pulse signal；
Transmitting radar antenna (101), the deception pulse signal generated for transmitted waveform generator and true pulse signal.
3. a kind of confrontation of the adaptive anti-spoofing system using confrontation active decoy interference as claimed in claim 1 or 2
The adaptive anti-spoofing method of active decoy interference, which is characterized in that comprise the steps of:
Step S1, radar emission module generates according to radar signal parameter and emits deception pulse signal and true pulse signal；
The radar signal parameter includes: cheating the pulsewidth of pulse signal, and deception pulse signal and true pulse signal
Between transmission interval；
Step S2, radar receiving module receives the active decoy interference signal hair of target echo signal and jammer transmitting simultaneously
Give signal processing module；
Step S3, after signal processing module carries out pulse pressure processing and detection to the signal received, target gain and surrounding are calculated
The difference of clutter or obstacle gain is sent to adaptive algorithm module；
Step S4, adaptation algorithm block judges whether gain difference is more than or equal to desired value, if so, the last period is obtained
Radar signal parameter is transferred to radar emission module, if not, being calculated using adaptive algorithm according to gain difference new
Radar signal parameter is transferred to radar emission module.
4. the adaptive anti-spoofing method of confrontation active decoy interference as claimed in claim 3, which is characterized in that described
It cheats pulse signal and the correlation of true pulse signal is inconsistent.
5. the adaptive anti-spoofing method of confrontation active decoy interference as claimed in claim 3, which is characterized in that radar connects
It receives module and the signal received is down-converted to intermediate frequency, be transferred to signal processing module after sample quantization.
6. the adaptive anti-spoofing method of confrontation active decoy interference as claimed in claim 3, which is characterized in that described
Pulse pressure processing is that radar return signal and the actual signal of radar emission are carried out matched filtering.
7. the adaptive anti-spoofing method of confrontation active decoy interference as claimed in claim 3, which is characterized in that described
Detection is to carry out square-law or envelope detection, determines target pulse using the thresholding that constant false alarm is handled.
8. the adaptive anti-spoofing method of confrontation active decoy interference as claimed in claim 3, which is characterized in that described
Adaptive algorithm includes lms algorithm and recursive least squares.
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| SE2000153A1 (en) * | 2020-09-08 | 2022-03-09 | Anders Widman | Radar electronic protection method against DRFM false target jamming |
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