CN106646398B - The active camouflage means of defence and device of modulation radar chaff are segmented based on leggy - Google Patents
The active camouflage means of defence and device of modulation radar chaff are segmented based on leggy Download PDFInfo
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- CN106646398B CN106646398B CN201610874469.7A CN201610874469A CN106646398B CN 106646398 B CN106646398 B CN 106646398B CN 201610874469 A CN201610874469 A CN 201610874469A CN 106646398 B CN106646398 B CN 106646398B
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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
- G01S7/021—Auxiliary means for detecting or identifying radar signals or the like, e.g. radar jamming signals
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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
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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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
Abstract
The invention discloses a kind of active camouflage means of defences and device that modulation radar chaff is segmented based on leggy.By controlling interference signal feature, in diameter radar image generation quantity, position, area, brightness controllable image block coverage goal and periphery background image, reach camouflaging purpose.Method of the invention is the processing done to two dimension, signal is received as pulse signal at equal intervals, the maximum length of block signal is short segmentation than a pulse width for receiving signal in short-term, it is the interference of dimension of adjusting the distance, it is long segmentation when the minimum length of block signal is longer than a pulse repetition period for receiving signal, is the interference to Doppler's dimension.Device in the present invention, including controller and digital radiofrequency memory DRFM, controller are connected with digital radiofrequency memory DRFM, and controller controls the segmented mode and phase modulation value of the radar signal；DRFM obtains a peacekeeping two dimension interference signal according to segmented mode and phase modulation value.
Description
Technical field
The present invention relates to camouflage of target protection technology fields, and in particular to one kind is based on leggy segmentation modulation radar chaff
Active camouflage means of defence and device.
Background technique
Synthetic aperture radar has round-the-clock, the round-the-clock ability being imaged on a surface target, passes through the fine two dimension of target
Structural information realizes the identification to target.
The hidden camouflage method of target is generally divided into inside and outside two classes." internal type " hidden camouflage measure, that is, stealth technology, passes through
Telltale characteristics are reduced, to radar, mirror-reflection and corner reflection effect are mainly avoided using form construction design, used
Absorbing material weakens radar scattering etc., and depending merely on stealth technology, to reduce telltale characteristics difficulty big, at high cost, can not solve at all
The certainly hidden spoofing problem of target." external-added " hidden camouflage is mainly according to target shape size, exposure symptoms etc., additional camouflage
Net, shield equipment, decoy etc. change target scattering feature, reduce synthetic aperture radar discovery and identification destination probability.Mesh
Before, main " external-added " hidden camouflage mode is using passive equipment, and the major defect of such equipment is to install to remove to receive
Journey is complicated, and area coverage is limited, and is generally not used to maneuvering target.Synthetic aperture radar is returned by radar on a surface target
Two dimension compression processing imagings of distance and bearing of wave signal, azimuth dimension is also referred to as Doppler's dimension, in the arteries and veins of radar signal
Reason, obtain range information, handle the arteries and veins of radar signal, obtain azimuth information, that is, doppler information, individually obtain away from
Belong to one-dimensional processing from information or azimuth information；It is comprehensive to obtain two information by one or many processing, belong to two-dimentional place
Reason.Currently used for mainly having for SAR imaging: Range-Doppler algorithm, Chirp-Scaling algorithm and Specan are calculated
Method etc., it all includes Range compress, Azimuth Compression, distance translation correction, DOPPLER parameter Estimation that algorithm, which generally comprises,
It as sequencing and is not fixed, imaging radar reception can usually be handled and be regarded as depending on algorithms of different by imaging process
One two-dimensional linear system, it is assumed that signal meets the condition decoupled to orientation in distance, can be by the processing of the two-dimentional system
The process for being decomposed into two one-dimensional processing accounts for respectively.
Summary of the invention
In view of this, current camouflage there are aiming at the problem that, the present invention provides one kind based on leggy segmentation adjust
The active camouflage protection side of (Multiple Phase Sectionalized Modulation, MPSM) the radar chaff method of system
Method and device, by controlling interference signal feature, controllable in diameter radar image generation quantity, position, area, brightness
Image block coverage goal and periphery background image, reach camouflaging purpose.Method of the invention is the processing done to two dimension, receives letter
Number for pulse signal at equal intervals, the maximum length of block signal is short segmentation than a pulse width for receiving signal in short-term, is
It is long segmentation when the minimum length of the interference for dimension of adjusting the distance, block signal is longer than a pulse repetition period for receiving signal, is
Interference to Doppler's dimension.The active camouflage means of defence for being segmented modulation radar chaff based on leggy includes the following steps:
Step 1, the radar signal received is temporally segmented, obtains each block signal, the maximum of block signal
Length is shorter than a pulse width of the radar signal, and wherein segments is not less than 2；Phase is carried out respectively to each block signal
Modulation, the block signal after obtaining phase-modulation, wherein phase modulation value takes an arbitrary value in [0,2 π], all segmentation letters
Number phase modulation value at least there are two not identical；All modulated block signals are integrated into one entirely in chronological order
Segment signal to get arrive one-dimensional interference signal；
Step 2, this signal is temporally segmented, obtains as input signal by one-dimensional interference signal step 1 obtained
Minimum length to each block signal, block signal is longer than a pulse repetition period of the radar signal, wherein segments
Not less than 2；Phase-modulation is carried out respectively to each block signal, the block signal after obtaining phase-modulation, wherein phase modulation value
Take an arbitrary value in [0,2 π], at least there are two not identical in the phase modulation value of all block signals；By all modulation
Block signal afterwards is integrated into a full section signal in chronological order to get final two-dimentional interference signal is arrived；
Step 3, the two-dimentional interference signal that will be obtained is sent to enemy radar, realizes active camouflage protection.
Further, the two-dimentional interference signal expression formula are as follows:
sJ(t)=s (t) p (t) q (t) (1)
Wherein s (t) is radar signal, and p (t) is the modulated signal function that phase-modulation uses in step 1, p (t) expression formula
Are as follows:
Wherein, subscript j indicate j-th of phase modulation value, j=1,2 ..., p, p be phase modulation value sum, j-th
Phase modulation value φjThe starting of corresponding block signal and cut-off time be respectivelyWithSubscript i indicates phase modulation value pair
The segmentation subscript answered, i=1,2 ..., nj, njIt is φ for phase modulation valuejBlock signal sum, the total segments of signal is institute
State the sum of the block signal number for including under all phase modulation values in step 1；
Q (t) is the modulated signal function that phase-modulation uses in step 2, q (t) expression formula are as follows:
Wherein, subscript v indicate v-th of phase modulation value, v=1,2 ..., q, q be phase modulation value sum, v-th
Phase modulation value φvThe starting of corresponding block signal and cut-off time be respectivelyWithSubscript u indicates phase modulation value pair
The segmentation subscript answered, u=1,2 ..., nv, nvIt is φ for phase modulation valuevBlock signal sum, the total segments of signal is institute
State the sum of the block signal number for including under all phase modulation values in step 2.
The device that the active camouflage means of defence of modulation radar chaff is segmented based on leggy, including control are realized in the present invention
Device and digital radiofrequency memory DRFM processed, controller are connected with digital radiofrequency memory DRFM, and controller controls the radar letter
Number segmented mode and phase modulation value；DRFM obtains peacekeeping two dimension interference letter according to segmented mode and phase modulation value
Number.
Controller in the active camouflage protective device of modulation radar chaff is wherein segmented based on leggy to pass through to segmentation side
The control of section length in formula controls the size that enemy radar receives generation interference image block after interference signal with this.
Further, controller is controlled enemy's imaging radar with this and is received by the control to signal processing channel number
Interference signal generate interference image number of blocks.
It is segmented the active camouflage protective device of modulation radar chaff based on leggy, further includes that receiving antenna, low noise are put
Big device LNA, low-converter, upconverter, power amplifier, transmitting antenna and signal measurement unit, receiving antenna receive radar
Signal is divided into two channels, a downconverted device in channel, into DRFM processing through low-noise amplifier；Another channel signal
The metrical information of entering signal measuring unit, measuring unit output is input to controller, controller and digital radiofrequency memory
DRFM series connection, through upconverter, power amplifier is emitted two-dimentional interference signal that treated by transmitting antenna.
Passed through by the control and controller of the installation site to active camouflage protective device to signal amount of delay and more
The general control for strangling modulation voltage controls the position that the interference signal that enemy's imaging radar receives generates interference image block with this.
The utility model has the advantages that
Leggy is segmented modulated interferer method and is applied to interference synthetic aperture radar, can be used for generating distance and bearing two
Diffusion decoy in dimension, generates rectangular interference image block in SAR image, and the size of rectangular interference image block can be controlled
System.
When applied to camouflage, countermeasure set is installed in the objective of defense, the size of setting interference image block is greater than anti-eye protection
The brightness of dimensioning, setting interference image block is better than objective of defense brightness, it can the coverage goal figure in space, brightness of image
Picture, to realize camouflage protection purpose.
By signal replication, multiple images block also can produce, be distributed in objective of defense periphery, generate fascination effect.
Detailed description of the invention
Fig. 1 is the non-equal part modulation principle schematic diagram of three phases.
Fig. 2 is interference covering effect schematic diagram, wherein (a), (b) are respectively that the two-dimensional surface of state no interference signal and three-dimensional are stood
Body schematic diagram, (c), (d) be respectively interference signal two-dimensional surface and 3 D stereo schematic diagram.
Fig. 3 is embodiment device figure.
Fig. 4 is diameter radar image, and camouflage is not carried out in two vehicle targets A, B.
Fig. 5 is that two vehicles A, B independently implement camouflage, respectively control interference tile size and brightness.
Fig. 6 is the effect picture for implementing collaboration camouflage by vehicle A, and control produces the biggish interference image block of area, simultaneously
Masking camouflage vehicle A itself and vehicle B.
Fig. 7 is to implement to pretend by vehicle A, generates multiple interference image blocks, and the position of control interference image block guarantees masking
Vehicle A and vehicle B, while multiple images block is generated, reach fascination effect.
Specific embodiment
The present invention will now be described in detail with reference to the accompanying drawings and examples.
The present invention provides a kind of active camouflage means of defence and device that modulation radar chaff is segmented based on leggy, bases
Include the following steps: in the active camouflage means of defence that leggy is segmented modulation radar chaff
Step 1, the radar signal received is temporally segmented, obtains each block signal, the maximum of block signal
Length is shorter than a pulse width of the radar signal, and wherein segments is not less than 2；Phase is carried out respectively to each block signal
Modulation, the block signal after obtaining phase-modulation, wherein phase modulation value takes an arbitrary value in [0,2 π], all segmentation letters
Number phase modulation value at least there are two not identical；All modulated block signals are integrated into one entirely in chronological order
Segment signal to get arrive one-dimensional interference signal；
Step 2, this signal is temporally segmented, obtains as input signal by one-dimensional interference signal step 1 obtained
Minimum length to each block signal, block signal is longer than a pulse repetition period of the radar signal, wherein segments
Not less than 2；Phase-modulation is carried out respectively to each block signal, the block signal after obtaining phase-modulation, wherein phase modulation value
Take an arbitrary value in [0,2 π], at least there are two not identical in the phase modulation value of all block signals；By all modulation
Block signal afterwards is integrated into a full section signal in chronological order to get final two-dimentional interference signal is arrived；
Step 3, the two-dimentional interference signal that will be obtained is sent to enemy radar, realizes active camouflage protection.
The two dimension interference signal expression formula are as follows:
sJ(t)=s (t) p (t) q (t) (4)
Phase modulation value jump between block signal is indicated with jump function ε (t), respectively with split time starting point
Block signal is obtained multiplied by radar full section signal with the difference of two jump functions centered on cut off；To each block signal point
Not carry out phase-modulation, i.e., by block signal multiplied by phase modulation value complex exponential, block signal after obtaining phase-modulation owns
Block signal is integrated into a full section signal in chronological order, obtains final interference signal, and wherein s (t) is radar signal, p
(t) the modulated signal function used for phase-modulation in step 1, p (t) expression formula are as follows:
Wherein, subscript j indicate j-th of phase modulation value, j=1,2 ..., p, p be phase modulation value sum, j-th
Phase modulation value φjThe starting of corresponding block signal and cut-off time be respectivelyWithSubscript i indicates phase modulation value pair
The segmentation subscript answered, i=1,2 ..., nj, njIt is φ for phase modulation valuejBlock signal sum, the total segments of signal is institute
State the sum of the block signal number for including under all phase modulation values in step 1；
Q (t) is the modulated signal function that phase-modulation uses in step 2, q (t) expression formula are as follows:
Wherein, subscript v indicate v-th of phase modulation value, v=1,2 ..., q, q be phase modulation value sum, v-th
Phase modulation value φvThe starting of corresponding block signal and cut-off time be respectivelyWithSubscript u indicates phase modulation value pair
The segmentation subscript answered, u=1,2 ..., nv, nvIt is φ for phase modulation valuevBlock signal sum, the total segments of signal is institute
State the sum of the block signal number for including under all phase modulation values in step 2.
Leggy segmentation is modulated to combine the jamming signal type under control by two-dimensional parameter, interference signal expression formula and signal point
Section length and quantity, the size of phase modulation value and sequence it is related, the output result that modulated signal obtains is equivalent to original signal
It is multiplied with compound function, is only multiplied with p (t) when receiving radar signal, then only changes signal arteries and veins internal characteristic, target is obtained to radar
Range information is interfered；When the radar signal received is only multiplied with q (t), then only changes characteristic between signal arteries and veins, radar is obtained
It takes target speed information i.e. doppler information to be interfered, passes through doppler information computer azimuth information；When radar signal and p
(t) it is multiplied with q (t), then characteristic changes between arteries and veins in the arteries and veins of signal, and the image information for obtaining target to radar is done
It disturbs.In Fig. 1, p=3, n1=n2=n3=2, q=3, N1=N2=N3=2.
By Radar Signal Processing process it is found that handling in arteries and veins is the fast time, it is set as tr, indicate using emission time as starting point
Time, fast time are used to measure the time of radio wave propagation；It is the slow time that the time is handled between arteries and veins, is set as tm, pulse signal is to repeat
Cycle T successively emits, i.e. emission time tm=mT (m=0,1,2 ...), the slow time is the metering exomonental moment, when fast
Between, slow time and fulltime relationship be t=tm+tr.Interference signal is written as follow form:
sJ(t)=s (tr,tm)·p(tr)·q(tm) (6)
Regard the two-dimensional process process of interference signal as two one-dimensional processing, it may be assumed that
In formula,Indicate distance dimension reference function, wherein TPFor signal pulsewidth, μrFor letter
Number chirp rate.Indicate azimuth dimension reference function, wherein TLFor synthetic aperture time, μaFor
The change rate of Doppler frequency.
Radar receives echo-signal s (t) and interference signal sJ(t) and matched filtering processing is carried out, it is therefore an objective to export
End obtains maximum signal-to-noise ratio.It is as follows to the process description of interference signal processing:
Step 1, signal is obtained in the expression formula of frequency domain by Fourier transformation:
In formula, η indicates that amplitude changed factor, τ indicate the minimum length of signal subsection, tdIndicate from radar emission signal to
Receive the time delay of interference signal, ωkIndicate each angular frequency component in signal band, 0 < ω1,ω2,...,ωK<
B, B are signal bandwidth, φkIndicate the phase modulation value in the frequency component.
Step 2, according to matched filtering principle, consider in specific TMThe Signal to Noise Ratio (SNR) that moment obtains is maximum, expression formula
Are as follows:
The formula be maximized and if only ifIn formula, F (j ω) indicates the frequency of radar emission signal
Domain expression formula, * indicate the conjugate operation of signal.
It further derives, the matched filtering processing of interference signal can obtain:
The formula is the matched filtering output of interference signal.
Step 3, it substitutes into typical linear frequency modulation (LFM) signal to be calculated, signal expression are as follows:
F in formula0For signal carrier frequency, μrFor signal chirp rate.
LFM signal spectrum can be approximately a fixed value in a certain range, can be written as:
ω in formulaLAnd ωHIndicate the bound of frequency spectrum, and ωH-ωL=B.
Since LFM signal has time-frequency correlation properties, phase-modulation makes signal generate frequency displacement, and shift frequency amount is set asIt is by frequency displacement bring delay volumeThat is delay volume td k=td-Δ
tk.Substitution formula (11), obtains:
Consideration phase modulation difference is Δ φ1Block signal, if its frequency bandwidth isThen
Δf1=B1/2π.This section of interference signal pulse compression result is calculated, can be obtained:
In formula,It enables
Then above formula is equivalent toThe final calculation result of formula (14) are as follows:
In complex plane, finally obtained power is multiple vector superposed as a result, its statistical model can be described as be at
The orderly distance of swimming in coordinate plane, signal are overlapped mutually and offset and obtained final output result.From the above equation, we can see that signal
The amplitude of vector is related with the bandwidth of each block signal, and argument and amplitude are related with the phase modulation of each block signal, segmentation
It causes signal bandwidth to reduce, by the characteristic of LFM compression of signal pulse it is found that output signal main lobe can broaden, that is, generates extension mesh
Mark when the extension target's center is overlapped with real goal center in time or is close, generates the compressed dry for covering real goal
Disturb effect.
Processing for one-dimensional distance dimension, calculated result can be expressed as:
sj′(tr,tm)=sj_r(tr,tm)·q(tm) (17)
CF signal is exp (j2 π f0T), wherein t is full-time, is tieed up after reference function matches by distance and is not sent out
Changing, and dimension processing output result of adjusting the distance is without influence.This is proposed that then above formula is further write:
s′(tr,tm)=s 'j_r(tr,tm)·exp(j2πf0tm)·q(tm) (18)
When azimuth dimension makees synthetic aperture processing, by oblique distanceTaylor decomposition is carried out, is obtained:
Wherein, RcFor the most short oblique distance of antenna and target.In view of doppler centroid fdAnd Algorithm for Doppler Frequency Rate-of-Change
fr:
Substituting into expression formula can obtain:
It substitutes the above to formula (18), the signal expression after Range compress can be write:
ByIt is found that signal in azimuth dimension is still a linear FM signal, therefore itself and distance
Dimension handles rule having the same, generates same interference effect, and azimuth dimension processing has same rule with apart from dimension processing.
Two dimension interference covering effect is as shown in Fig. 2, (a) in Fig. 2, (b) are respectively the two-dimensional surface and three of state no interference signal
Tie up stereoscopic schematic diagram, (c), (d) be respectively interference signal two-dimensional surface and 3 D stereo schematic diagram.
The active camouflage means of defence and device for being segmented modulation radar chaff based on leggy are as shown in figure 3, include receiving
Antenna, low-noise amplifier LNA, low-converter, digital radiofrequency memory DRFM, upconverter, power amplifier, transmitting day
Line, signal measurement apparatus, controller.
Receiving antenna receives radar signal, through low-noise amplifier, is divided into two channels, a downconverted device in channel,
Into DRFM processing；Another channel signal entering signal measuring unit, obtains signal characteristic information, these characteristic informations are input to
Controller, as the input quantity of camouflage effectiveness control, controller is connected with digital radiofrequency memory DRFM, by split time to control
The input instruction of device processed is operated, the segmented mode and phase modulation value of controller control radar signal；DRFM according to point
Segment signal and phase modulation value obtain a peacekeeping two dimension interference signal, and two-dimentional interference signal that treated is through upconverter, function
Rate amplifier is emitted by transmitting antenna.
Controller output control DRFM realizes control and modulation to signal amplitude, frequency, phase etc., realizes different puppets
Fill effect.By covering, upsets target image and realize camouflage effectiveness, make synthetic aperture radar that can not find and identify target.It is pseudo-
Dress effect control is mainly reflected in the control of quantity, position, size, intensity to interference image block, wherein interference image block number
Amount is determined by signal processing channel number, interferes tile location by the installation site and signal amount of delay of active protection camouflage device
And the control of Doppler modulation amount, interference tile size are controlled by section length in segmented mode, interfere image bulk strength by believing
Number power control.The image number of blocks of image is interfered, tile location, tile size, image Block Brightness is controllable, and can be with
Independent control, wherein signal processing channel number, signal amount of delay and Doppler modulation amount and segmented mode are by controller control
System.
By taking vehicle target pretends as an example, illustrate camouflage effectiveness, diameter radar image as shown in Figure 4, two vehicle mesh
A is marked, camouflage is not carried out in B.In Fig. 5, two vehicles A, B independently implement camouflage, respectively control interference tile size and bright
Degree.In Fig. 6, implemented to cooperate with camouflage by vehicle A, control generates the biggish interference image block of area, while covering camouflage vehicle A certainly
Body and vehicle B.In Fig. 7, implement to pretend by vehicle A, generate multiple interference image blocks, the position of control interference image block guarantees
Vehicle A and vehicle B is covered, while generating multiple images block, reaches fascination effect.
The active camouflage method of target of the invention modulates gate stealing using phasor fragmentation, interferes synthetic aperture thunder
Reach picture, by interference image coverage goal position and periphery, reaches and change target image characteristics camouflage screening target
Purpose, the target, including ground, the fixed target of the water surface and moving target and target region.Installation or mesh in target
Mark nearby lays active dazzle system, handles synthetic aperture radar working signal by receiving, generates interference signal, active camouflage
Device can be used for pretending static target and moving target, adapts to multiband and pretends demand, can be with other active/passive camouflages
It is applied in combination with device, wherein controller includes signal amplitude, frequency, phase etc. to the control amount of DRFM, but is not limited to these
Control amount.
Active dazzle system uses relay type structure during embodiment realizes camouflage；Signal processing is using DRFM number
Signal processing or analog signal processing mode；Controlled using frequency measuring method, investigation equipment first to the enemy's signal received into
Row measurement obtains frequency range locating for signal, and jamming equipment uses the receiving antenna of corresponding band, realizes most preferably connecing to signal
It receives.The essential signal features of radar signal have signal pulse repetition period, pulse width, bandwidth, centre frequency, impulse amplitude.
In addition to this response formula structure or other structures also can be used in active dazzle system；When working frequency range, that is, feelings of known enemy radar
Notify breath when, can according to external input information carry out the corresponding jammer receiving antenna of control selections.
In conclusion the above is merely preferred embodiments of the present invention, being not intended to limit the scope of the present invention.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (7)
1. being segmented the active camouflage means of defence of modulation radar chaff based on leggy, which comprises the steps of:
Step 1, the radar signal received is temporally segmented, obtains each block signal of radar signal, radar signal
Each block signal in, the maximum length of block signal is shorter than a pulse width of the radar signal, and wherein segments is not
Less than 2；
Phase-modulation is carried out respectively to each block signal of radar signal, each segmentation letter of the radar signal after obtaining phase-modulation
Number, wherein phase modulation value takes an arbitrary value in [0,2 π], all block signals of the radar signal after phase-modulation
At least there are two not identical in phase modulation value；
By all block signals of the radar signal after phase-modulation be integrated into chronological order radar signal it is corresponding one it is complete
Segment signal to get arrive one-dimensional interference signal；
Step 2, this signal is temporally segmented as input signal, obtains one by one-dimensional interference signal step 1 obtained
Each block signal for tieing up interference signal, in each block signal of one-dimensional interference signal, the minimum length of block signal is than the thunder
A pulse repetition period up to signal is long, and wherein segments is not less than 2；
Phase-modulation is carried out respectively to each block signal of one-dimensional interference signal, the one-dimensional interference signal after obtaining phase-modulation
Each block signal, wherein phase modulation value takes an arbitrary value in [0,2 π], the institute of the one-dimensional interference signal after phase-modulation
Have in the phase modulation value of block signal at least that there are two not identical；
It is corresponding that all block signals of one-dimensional interference signal after phase-modulation are integrated into one-dimensional interference signal in chronological order
A full section signal to get to final two-dimentional interference signal；
Step 3, the two-dimentional interference signal that will be obtained is sent to enemy radar, realizes active camouflage protection.
2. being segmented the active camouflage means of defence of modulation radar chaff based on leggy as described in claim 1, feature exists
In the two dimension interference signal expression formula are as follows:
sJ(t)=s (t) p (t) q (t)
Wherein s (t) is radar signal, and p (t) is the modulated signal function that phase-modulation uses in step 1, p (t) expression formula are as follows:
Wherein, subscript j indicates the corresponding subscript of j-th of phase modulation value, j=1, and 2 ..., p, p are the sum of phase modulation value,
J-th of phase modulation value φjThe starting of corresponding block signal and cut-off time be respectivelyWithSubscript i indicates modulation phase
The corresponding segmentation subscript of place value, i=1,2 ..., nj, njIt is φ for phase modulation valuejBlock signal sum, signal is always segmented
Number is the sum of the block signal number for including under all phase modulation values in the step 1；
Q (t) is the modulated signal function that phase-modulation uses in step 2, q (t) expression formula are as follows:
Wherein, subscript v indicates v-th of phase modulation value, v=1, and 2 ..., q, q are the sum of phase modulation value, v-th of modulation
Phase value φvThe starting of corresponding block signal and cut-off time be respectivelyWithSubscript u indicates that phase modulation value is corresponding
Segmentation subscript, u=1,2 ..., nv, nvIt is φ for phase modulation valuevBlock signal sum, the total segments of signal is described
The sum of block signal number for including under all phase modulation values in step 2.
3. a kind of realize the dress for being segmented the active camouflage means of defence of modulation radar chaff described in claim 1 based on leggy
It sets, which is characterized in that including controller and digital radiofrequency memory DRFM, controller is connected with digital radiofrequency memory DRFM,
Controller controls the segmented mode and phase modulation value of the radar signal；DRFM is according to segmented mode and phase modulation value
Obtain a peacekeeping two dimension interference signal.
4. device as claimed in claim 3, which is characterized in that controller by the control to section length in segmented mode,
The size that enemy radar receives generation interference image block after interference signal is controlled with this.
5. device as claimed in claim 3, which is characterized in that controller is by the control to signal processing channel number, with this
The interference signal that control enemy's imaging radar receives generates interference image number of blocks.
6. device as claimed in claim 3, which is characterized in that further include receiving antenna, low-noise amplifier LNA, down coversion
Device, upconverter, power amplifier, transmitting antenna and signal measurement unit, receiving antenna receive radar signal, put through low noise
Big device is divided into two channels, a downconverted device in channel, into DRFM processing；Another channel signal entering signal measurement is single
The metrical information of member, signal measurement unit output is input to controller, and controller is connected with digital radiofrequency memory DRFM, DRFM
Through upconverter, power amplifier is emitted the two-dimentional interference signal of output by transmitting antenna.
7. device as claimed in claim 3, which is characterized in that pass through the control and control of the installation site to described device
Device is controlled the interference signal that enemy's imaging radar receives with this and is produced by the control to signal amount of delay and Doppler modulation amount
The position of raw interference image block.
Priority Applications (1)
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