CN107037410A - A kind of method disturbed radar, device and frequency control battle array jammer - Google Patents
A kind of method disturbed radar, device and frequency control battle array jammer Download PDFInfo
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- CN107037410A CN107037410A CN201710251961.3A CN201710251961A CN107037410A CN 107037410 A CN107037410 A CN 107037410A CN 201710251961 A CN201710251961 A CN 201710251961A CN 107037410 A CN107037410 A CN 107037410A
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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
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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
- G01S7/38—Jamming means, e.g. producing false echoes
Abstract
The present invention relates to a kind of method disturbed radar, device and frequency control battle array jammer.Frequency control battle array jammer is used as the front end basic element of character using digital radiofrequency memory, storage processing is carried out to the enemy's detectable signal received, flexibly use repeating jamming or smart munition, finally by frequency control array antenna transmitting interference signal, to produce more decoys, detection and tracking of the effective destruction enemy radar to our moving target are disturbed than conventional.This method innovative point is the application that this new array of battle array is controlled to frequency, interference signal is launched by frequency control array antenna, make the interference signal launched between each array element different in frequency, on the one hand, strengthen the power of interference signal in the form of array, on the other hand, the interference signal of transmitting presents otherness in frequency, and serious puzzlement is caused to the detection of the target of enemy radar on frequency domain.
Description
Technical field
The invention belongs to the gate stealing field in electronic countermeasure, and in particular to a kind of side disturbed radar
Method, device and frequency control battle array jammer.
Background technology
Radar chaff is an important component in electronic countermeasure, is also essential one of modern electronic warfare
Point.With the electromagnetic environment of battlefield space increasingly complexity, countries in the world are efficiently controlled all finding optimal solution
Electromagnetic space.With enriching constantly and perfect for radar theory, advanced electronic technology is also constantly obtained in radar system
Widely apply, occur in that pulse Doppler radar, pulse compression radar, phased-array radar and synthetic aperture radar etc. are a variety of
New system radar.The various Anti-Jamming Techniques of these new system radar integrated uses, significantly reduce traditional briquettability and do
The effect disturbed with duplicity is disturbed, the antijamming capability of radar system is substantially increased, this is researched and proposed to gate stealing
Stern challenge.
In radar chaff, except interference signal to be ensured possesses enough jamming powers, in frequency, direction and polarization
It is aligned beyond enemy radar, in addition it is also necessary to which a kind of good jamming signal type is so as to the interference effective to radar implementation.Therefore New System
Effective interference problem of radar becomes the focus of interference circle research, based on digital radiofrequency memory (Digital Radio
Frequency Memory, DRFM) coherent interference technology be widely used.DRFM can intercept and capture, store, handling,
Enemy radar signal is replicated, at present, the smart noise jamming based on DRFM, multi-false targets cheating interference true to nature etc. provide for radar
New effective jamming signal type.
Using coherent interference technology the interference signal into radar receiver can be made to obtain and realistic target echo identical phase
Dry-cure gain, it is that it can accurately imitate radar hair with noise jamming or the maximum difference of other cheating interference patterns
Penetrate the waveform of signal.Traditional suppression jamming is to launch high-power interference signal using interference transmitting equipment, makes the thunder of enemy
Saturation is overloaded up to receiver or makes the disturbed covering of useful signal, but this conflicting mode is for the interference effect of new system radar
Not very good, it can not obtain the gain that matching is received, and cause most interfering energy not all to be utilized, this
Outside, the characteristic of its exposed property interference is even more to be easy to be discovered by enemy radar.Therefore, modern radar is mainly done using duplicity
Mode is disturbed, wherein repeating jamming and smart munition is widely used.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of method disturbed radar, device and frequency control battle array and done
Machine is disturbed, frequency control battle array jammer is carried out using digital radiofrequency memory as the front end basic element of character to the radar appearance received
Storage is handled, and flexibly uses repeating jamming or smart munition, finally by frequency control array antenna transmitting interference signal, to produce ratio
The conventional more decoys of interference, detection and tracking of the effective destruction radar to our moving target.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：
A kind of method disturbed radar, comprises the following steps：
(1) reflected signal by target of investication in the investigation region from the radar is obtained；
(2) reflected signal is replicated to obtain original disturbed signal；
(3) according to difference on the frequency set in advance and reference frequency, the original disturbed signal is launched by frequency control array antenna
To disturb the radar.
The beneficial effects of the invention are as follows：
The present invention by frequency control battle array technology by being applied to effective interference to radar, based on this interference is disturbed with duplicity,
This method has interference performance strong, and jamming effectiveness is high, the features such as interference is disguised strong, great when for various new system radars
Research and application value.
On the basis of above-mentioned technical proposal, the present invention can also do following improvement.
Further, the frequency control battle array is linear array, and the transmission signal of each array element in the frequency control battle array is：
Wherein, J (t) is original disturbed signal, and m is the label of array element, fmFor the transmitting carrier frequency of m-th of array element, fm=f0+
(m-1) Δ f, f0On the basis of frequency, Δ f be difference on the frequency.
Above-mentioned further scheme has the beneficial effect that：Linear FM signal can be increased by being modulated to carrier frequency
The transmitted bandwidth of signal simultaneously realizes pulse compression when receiving, efficiently solve radar system operating distance and range resolution ratio it
Between contradiction.
In addition, present invention also offers a kind of device disturbed radar, including：
Signal acquisition module, for obtaining the reflected signal by target of investication in the investigation region from the radar；
Signal replication module, for replicating the reflected signal to obtain original disturbed signal；And
Signal emission module, for according to difference on the frequency set in advance and reference frequency, institute to be launched by frequency control array antenna
Original disturbed signal is stated to disturb the radar.
Further, the frequency control battle array is linear array, the transmission signal of each array element in the frequency control battle array
Wherein, J (t) is original disturbed signal, and m is the label of array element, fmFor the transmitting carrier frequency of m-th of array element, fm=f0+
(m-1) Δ f, f0On the basis of frequency, Δ f be difference on the frequency.
Further, described device is located at outside the scouting region.
In addition, present invention also offers a kind of frequency control battle array jammer, including：Disturbing radar in accordance with the above
Device.
Further, the frequency control battle array jammer is many, and every frequency control battle array jammer single can take turns to operate or multiple associations
With work.
Above-mentioned further scheme has the beneficial effect that：Enemy's reconnaissance radar is difficult to the interference rule of our jammer
Rule, and when there is multiple moving targets, substantial amounts of decoy generation can have a strong impact on the normal work of enemy radar, make it
Lose detecting function.
Further, the frequency control battle array jammer is many, and every frequency control battle array jammer single can take turns to operate or multiple associations
With work.
Above-mentioned further scheme has the beneficial effect that：Enemy's reconnaissance radar is difficult to the interference rule of our jammer
Rule, and when there is multiple moving targets, substantial amounts of decoy generation can have a strong impact on the normal work of enemy radar, make it
Lose detecting function.
Further, the frequency control battle array interference is using digital radiofrequency memory as the front end basic element of character, to control array antenna work frequently
For rear firing emission part.
Above-mentioned further scheme has the beneficial effect that：Digital radiofrequency memory can be intercepted and captured, stores, handles, replicate radar
Signal, at present, the smart noise jamming based on digital radiofrequency memory, multi-false targets cheating interference true to nature are provided newly for radar
Effective jamming signal type；Meanwhile, interference signal is launched by frequency control array antenna, makes the interference signal launched between each array element
All be different in frequency, on the one hand, strengthen the power of interference signal in the form of array, on the other hand, transmitting it is dry
Disturb signal and otherness is presented in frequency, serious puzzlement is caused to the detection of the target of radar on frequency domain.
Brief description of the drawings
Fig. 1 controls the array structure schematic diagram of battle array for the homogenous linear frequency that the present invention is utilized；
Fig. 2 schemes for the application scenarios modeling of the present invention；
Fig. 3 is overview flow chart of the invention；
Fig. 4 is single antenna retransmitted jamming receiver time-frequency target search figure；
Fig. 5 is frequency control battle array retransmitted jamming receiver time-frequency target search figure.
Embodiment
The principle and feature of the present invention are described below in conjunction with accompanying drawing, the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
The present invention designs a kind of method disturbed radar in view of the shortcomings of the prior art, and this method innovative point is
Application to frequency control this new array of battle array, frequency control battle array is applied to obtain having more effectively than traditional interference machine on jammer
Interference effect.The concept of frequency control battle array comes from phased array, and one of the advantage of phased-array radar is freely realize the sky of wave beam
Between scan, the transmitting of usual each of which array element, receive same signal, realize that the spatial domain of wave beam is swept by adjusting the phase-shift phase of phase shifter
Retouch.Therefore current, phased array has been widely used among the systems such as modern communicationses, radar and navigation.Frequency control battle array and phased array
Difference is that frequency control battle array has a less frequency increment, the proposition of its concept between the carrier frequency of adjacent array element
Itself it is, in order to improve the distance dependencies that phased array beam does not have, to be provided for the interference and clutter of suppression distance dependencies
May.Frequency control array beam is time, the periodic function of angle and distance, and usual we use the frequency control battle array array junctions of homogenous linear
Structure, M transmitting antenna spacing d is evenly distributed.
The array structure schematic diagram of battle array, the hair of first array element are controlled for the homogenous linear frequency that the present invention is utilized as shown in Figure 1
Penetrate signal carrier frequency and be designated as f0, adjacent array element transmission signal carrier frequency difference is Δ f, then the carrier wave of m-th of array element transmission signal
Frequency is：
fm=f0+ (m-1) Δ f, m=1,2, M (1)
In an embodiment of the invention, we launch interference signal by frequency control array antenna, make each array element
Between the interference signal launched all be different in frequency, on the one hand, strengthen the power of interference signal in the form of array,
On the other hand, the interference signal of transmitting presents otherness in frequency, to the detection of the target of enemy radar on frequency domain
Cause serious puzzlement.
Assuming that the original disturbed signal of transmitting is J (t), then be by the signal that each array element of control battle array is launched frequently：
When m-th of interference signal is transmitted into the (r in far fieldm, θ) position when, its signal expression is
Wherein,
rm=r- (m-1) dsin θ (4)
θ is target direction, and r is that reference array element is first array element range-to-go.
Bring (1), (2), (4) into formula (3), signal can be obtained：
By abbreviation, ignore minimum item, the result that can obtain the interference signal superposition at far field objects is：
Wherein, the Section 1 of exponential term embodies FDA time variation, and Section 2 is as the phase difference of phased array, and the 3rd
Item embodies FDA distance and frequency increment dependence, and Section 4 embodies the pass that FDA has coupling in distance and angle
System, its effect is the frequency bias properties that a burst of row are controlled using frequency, is realized than traditional interference method more preferably interference effect.
As can be seen here, FDA beam patterns not only have dependence of angle, also with time and distance dependencies.
Pulse Doppler radar is that the Doppler effect produced using relative motion between target and radar is tested the speed to realize
A kind of New Type Radar of function.Being proposed to of pulse Doppler radar solves asking for the strong land clutter interference of airborne head-down radar
Topic, it is a kind of radar of the full coherent system of utilization Doppler effect detection target information, can be realized to radar signal pulse
Frequency spectrum a single spectral line of going here and there is filtered, and with the ability that speed resolution is carried out to target, can more effectively solve to suppress extremely strong ground
The problem of noise jamming.In addition, pulse Doppler radar can be while mensuration distance, the velocity information of sensitivity, can be utilized many
General Le treatment technology realizes high-resolution synthetic aperture image.Due to existing most airborne radars, how general all employ pulse
The radar strangled in system, therefore the present invention is also modeled as pulse Doppler radar.
Radar signal employed in an embodiment of the invention is linear frequency modulation (Linear Frequency
Modulation, LFM) signal, the speed resoluting force and rate accuracy of radar system, its big band are improved the characteristics of its big time width
Wide the characteristics of, improves the range resolution and range accuracy of radar system again.Meanwhile, to improve the operating distance of radar system
It is required that signal has big energy, pulse compression technique is efficiently solved between radar system operating distance and range resolution
Contradiction.Linear frequency modulation becomes one of the most frequently used radar signal of modern radar as a kind of pulse compression technique.It is linear to adjust
The time-domain expression of frequency signal is s (t)=exp { j (2 π f0t+πkrt2), wherein, f0For carrier frequency, krFor frequency modulation rate.If arteries and veins
The duration is rushed for T, modulating bandwidth is B, then frequency modulation rate kr=B/T.The letter that linear FM signal is received after being handled through overcompression
Number, it exports D times that pulse peak power is input pulse peak power, and D is pulse pressure ratio, D=BT.In output power of transmitter
In the case of certain, the target echo signal of receiver output is handled by matched filtering compression, with narrower pulse width
Higher peak power, this just improves the range resolution and detection range of radar system simultaneously, this unique superior
Property makes its application prospect very considerable.
The application scenarios modeling figure of the present invention is illustrated in figure 2, the T regions set up in application scenarios model, figure are enemy
The monitoring and protecting region of reconnaissance radar, our frequency control battle array jammer is designed as in T regions to avoid being detected by enemy radar
Outside place flexibly place, frequency control battle array interference using digital radiofrequency memory as the front end basic element of character, with control frequently array antenna work
For rear firing emission part.Assuming that the J in figureiPoint is the location of frequency control battle array jammer, i number flexibly configurable.Enemy
Radar modelling is the pulse Doppler radar in single base, the E points in figure.The purpose that we controls gust jammer frequently will exactly be entered
Our moving target for entering enemy radar scouting region is hidden, and makes enemy radar can not be just by the illusion for forming multiple decoys
Our moving target is often monitored, so that enemy radar can not judge the location of our real goal and its motion
Speed.Frequency control battle array jammer single can take turns to operate, and multiple can also cooperate, such working method can detect enemy
The interference rule that radar is difficult to our jammer is examined, and when there is multiple moving targets, substantial amounts of decoy life
Into the normal work of enemy radar can be had a strong impact on, it is set to lose detecting function.Technical scheme is based on above-mentioned foundation
Application scenarios model, its interference method concrete technical scheme is as follows：
Step 1：E position of the pulse Doppler reconnaissance radar of an enemy in figure is simulated, radar covering is certain
Search coverage, be designated as T regions, radar is judged to the field emission radar signal s (t) by the detection to echo-signal
Whether there is foreign target to enter the region.
Step 2：When our moving target enters the T regions described in step 1, enemy radar can be sent to the region
Signal s (t) reflects, and a reflected signal part returns to radar receiver as true echo-signal, and some another signal is then
It will be reflected in the frequency control battle array jammer that we places outside region.
Step 3：The signal that jammer can send or reflect to the region carries out identification search repeatedly.When jammer is received
Signal intensity be more than certain threshold value when, can determine that it has searched the enemy's reconnaissance signal reflected back by target, otherwise
Continue search for.
Step 4：Jammer the enemy's reconnaissance signal received is identified storage using DRFM, realizes the height to signal
Speed capture and preservation.
Step 5：The pulse pattern and signal parameter of the radar signal received in accurate judgment step 4, are accurately replicated
The signal, and forward a signal to the frequency control battle array transmitting terminal of jammer.
Step 6：Frequency control battle array jammer scouts region T areas using the enemy residing for the array format to moving target of frequency control battle array
Domain transmitting interference signal J (t).
Step 7：A large amount of moving targets in the region can reflex to the interference signal produced by step 6 scouting of enemy
Radar.
Step 8：The radar of enemy can detect the clutter of echo-signal and a large amount of interference signals, and it receives signal r
(t)=s (t- τ1)+Jtotal(t-τ2).Wherein, τ1For the time delay of real goal echo, τ2For the time delay of interference signal.
Step 9：Estimation frequency control battle array jammer is to the interference decoy effect produced by enemy radar, with common single antenna
The decoy number that repeating jamming contrast is produced.
The invention discloses it is a kind of based on frequency control battle array jammer gate stealing method, compared to the prior art, its
Have the following advantages that：
(1) existing document is mostly to launch interference signal by traditional single antenna or array antenna, and our rule
It is that the forwarding to interference signal is realized by the new a burst of array antenna of frequency control, is the innovation in principle；
(2) compared with traditional interference, enemy is directly exposed to carry out reflectivity jammer to interference signal by target
Square monitored area is more disguised.
(3) existing interference method is limited to the deception effect of enemy radar, it is easy to is identified interference rule and loses
Interference effect is lost, the flexible configuration of the method intermediate frequency control battle array jammer can make enemy radar be difficult to out rule, so that taking advantage of
Deceive the better of interference.
(4) a certain new system radar of the present invention not just for enemy, and suitable for a variety of new system radars, can have
Preferable interference effect, has a wide range of application.
Embodiment 1
In the present embodiment, enemy radar is modeled as pulse Doppler radar, and its principle is relative using target and chaff interference
Different in the radial velocity of radar, echo-signal also has different Doppler frequencies and designed.It is mainly characterized by having
Stronger anti-deceptive interference and noise resisting ability, the typically interference to pulse Doppler radar can be divided into suppression jamming, distance
Cheating interference and velocity gate deception interference, the frequency control battle array jammer that the present invention is designed can be tried hard to while realizing that three of the above disturbs shape
The effect of formula, makes its interference to pulse Doppler radar more efficient.
It is illustrated in figure 3 the overview flow chart of the present invention.Radar signal of the present invention is linear FM signal, line
Property FM signal time-domain expression be s (t)=exp { j (2 π f0t+πkrt2), wherein, f0For carrier frequency, krFor frequency modulation rate.
If pulse duration T is 10us, modulating bandwidth B is 30MHZ, frequency modulation rate
The array number of a burst of array structure of frequency control of the present invention is 10, and array element spacing d is the half of wavelength X, battle array
Frequency difference Δ f between member is 10kHz, and the launching beam of frequency control battle array points to target T regions, and specific implementation step is as follows：
Step 1：Single base pulse Doppler radar is in E points to T field emission LFM pulse signals, and signal expression is s
(t)=exp { j (2 π f0t+πkrt2), wherein f0For the carrier frequency of radar, initiation parameter makes f0=10GHZ,For
Frequency modulation rate, wherein modulating bandwidth B=30MHZ, pulse duration T=10us, time domain isDetecting in T regions is
It is no with the presence of target.
Step 2：, can radar signal reflected, a part of signal reflex to radar reception when there is moving target in T regions
Machine, is designated as echo-signal r1(t)=s (t- τ1), wherein τ1For the time delay of echo-signal,R is the distance of target.Motion
Target can have Doppler frequency shift fd, andNow, can be by surveying fdObtain the radial velocity v of moving target.
Step 3：Part signal can be reflexed to our frequency control battle array jammer by target, and frequency control battle array jammer is assumed in this emulation
Only one in running order, and jammer receives the signal using DRFM, and accurately the signal parameter is analyzed in storage.
Step 4：DRFM forwards a signal to the transmitting terminal that frequency controls battle array jammer, and array number is 10, and array element spacing d is ripple
Frequency difference Δ f between long half, array element is 10kHz, the appropriate weight by setting, by interfering beam alignment target region.
Step 5：The frequency control battle array interference signal of the emulation is directly based upon the radar signal s (t) that jammer receives and enters line frequency
Control battle array forwarding, interference signalH (t) controls the array response of battle array equivalent to frequency.
Step 6：The frequency control paroxysm feature of penetrating is can be by the interference signal of different frequency while being sent to target area in synchronization
Domain, situation of the emulation based on single moving-target is better when for multiple moving-targets.
Step 7：The interference signal of each array element reflexes to radar receiver through target, and interference signal superposition expression formula is
Step 8：Radar receiver receive target echo signal with frequency control battle array interference signal and signal r (t)=sr(t)
+Jtotal(t)。
Step 9：Radar receiver carries out the two-dimentional matched filtering of time-frequency domain, when signal intensity is more than certain threshold value
It is determined with the appearance of target.Now, the interference signal of deception can by radar receiver as real target echo signal so that
Influence the judgement to moving target distance and speed.
Single antenna retransmitted jamming receiver time-frequency target search figure is illustrated in figure 4, now, single decoy letter can be produced
Number, it is possible to achieve the deception of distance dimension, but disturb readily identified.
Frequency control battle array retransmitted jamming receiver time-frequency target search figure is illustrated in figure 5, now, multiple decoy letters can be produced
Number, and the deception of distance and speed dimension can be realized simultaneously, the interference is disguised strong, is not easy to identification, and when frequency control battle array interference
Machine be multiple collaborative works when, interference effect more preferably, in addition, when target number for it is multiple when, its reflect interference signal
Also it can be incremented by double, its decoy generation number can be huger, and the interference to radar can be more efficient.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (8)
1. a kind of method disturbed radar, it is characterised in that comprise the following steps：
(1) reflected signal by target of investication in the investigation region from the radar is obtained；
(2) reflected signal is replicated to obtain original disturbed signal；
(3) according to difference on the frequency set in advance and reference frequency, launch the original disturbed signal to do by frequency control array antenna
Disturb the radar.
2. the method according to claim 1 disturbed radar, it is characterised in that the frequency control battle array is linear battle array
Arrange, the transmission signal of each array element in the frequency control battle array is：
Wherein, J (t) is original disturbed signal, and m is the label of array element, fmFor the transmitting carrier frequency of m-th of array element, fm=f0+(m-
1) Δ f, f0On the basis of frequency, Δ f be difference on the frequency.
3. a kind of device disturbed radar, it is characterised in that including：
Signal acquisition module, for obtaining the reflected signal by target of investication in the investigation region from the radar；
Signal replication module, for replicating the reflected signal to obtain original disturbed signal；And
Signal emission module, for according to difference on the frequency set in advance and reference frequency, the original to be launched by frequency control array antenna
Beginning interference signal is to disturb the radar.
4. the device according to claim 3 disturbed radar, it is characterised in that the frequency control battle array is linear battle array
The transmission signal of each array element in row, the frequency control battle array
Wherein, J (t) is original disturbed signal, and m is the label of array element, fmFor the transmitting carrier frequency of m-th of array element, fm=f0+(m-
1) Δ f, f0On the basis of frequency, Δ f be difference on the frequency.
5. the device according to claim 3 disturbed radar, it is characterised in that described device is located at described scout
Outside region.
6. a kind of frequency control battle array jammer, it is characterised in that including：Entering to radar according to any one of claim 3 to 5
The device of row interference.
7. frequency control battle array jammer according to claim 6, it is characterised in that the frequency control battle array jammer is many, every
Frequency control battle array jammer single can take turns to operate or multiple collaborative works.
8. frequency control battle array jammer according to claim 6, it is characterised in that the frequency control battle array interference is stored with digital RF
Device is as the front end basic element of character, to control array antenna frequently as rear firing emission part.
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