CN105929376B - Smart munition noise signal design method based on speed tracting - Google Patents
Smart munition noise signal design method based on speed tracting Download PDFInfo
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- 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
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Abstract
Smart munition noise signal design method based on speed tracting, the present invention relates to smart munition noise signal design method.The present invention is to solve decoy flight path it is uncorrelated when easily offseted by Radar cross-section redaction, the smart munition noise signal design method based on speed tracting that pressing type interference can not be played the role of and proposed the problem of to the less effectives of the interference protection measures such as echo sidelobe cancellation.This method is by Step 1: calculating time delay τ；Step 2: the rescattering for calculating target returns to the Doppler frequency shift f of radar antennad；Step 3: the rescattering calculated Jing Guo target returns to the range value A of radar antenna t moment target echo signalt；Step 4: calculate target echo signal sr(t) Step 5: adding Doppler frequency shift fdOffset and etc. realize.The present invention is applied to smart munition noise signal design field.
Description
Technical field
The present invention relates to smart munition noise signal design method, the smart munition noise more particularly to based on speed tracting
Design of Signal method.
Background technology
Assuming that radar emission signal is linear FM signal s (t), its expression formula is：
Wherein, f0For carrier frequency, μ is chirp rate.Assuming that target is point target, scattering resonance state σ, target range R,
Then the receptance function of target is：
H (t)=σ δ (t- τR) (2)
Wherein, τR=R/ (2c), c are the light velocity, then target echo is：
If the pulse compressed coefficient of signal processor is s*(- t), after matched filtering, obtains target echo after pulse pressure
Expression formula is as follows：
The frequency spectrum for making h (t) is H (f), and the frequency spectrum of s (t) is S (f), then the frequency spectrum of result is after matched filtering：
Spc(f)=H (f) | S (f)2(5)
Its time-domain expression can be write：
Wherein F-1(Spc(f)) it is the point spread function of linear FM signal.It is if the frequency spectrum S (f) of linear FM signal is near
Seemingly regard rectangular function as, then point spread function is Sinc functions, it can be seen that target echo pulse compression output result determines
In target response function.
Derived more than, arbitrary function collinearity FM signal phase convolution, its pulse compressed output signal is the letter
The convolution of number and point spread function, can also obtain process of pulse-compression gain.
(1) Pulse convolution jamming
Various forms of interference waveforms can be produced according to the multi-form that vision signal uses.Assuming that h (t) is k width
The train of pulse of the different shock pulse composition of different delay is spent, then h (t) can be expressed as：
Wherein UiFor each impulse amplitude, tiFor each impulse time delay.Jammer is by the linear FM signal of the radar emission of intercepting and capturing
The position of k shock pulse is displaced to respectively, and convolution results are equivalent to k time delay is different, the different radar signal of amplitude
It is overlapped.Each linear FM signal has identical time-frequency characteristic with radar echo signal, therefore can obtain identical
Pulse compression gains.The mechanism that such case produces Range Profile with the target that multi-scatter is formed is identical, i.e., in real goal
Multiple false point targets are generated afterwards.
Pulse convolution jamming can function well as the effect of cheating interference as from the foregoing, but decoy quantity is very little,
It can not play the role of pressing type interference.
Electronic countermeasure and the important component that anti-countermeasure techniques are modern high technology wars, through the beginning of whole war
Eventually, outcome of a war is served key.Radar system is electronic countermeasure and the kernel object for opposing to resist, and therefore, carries out thunder
It is one of current subject study direction extremely paid attention to both at home and abroad up to system interference technical research.
In recent years, as digital RF stores the gradual ripe and extensive utilization of (DRFM) technology, have concurrently cheating interference and
The smart noise jamming of the characteristics of noise jamming progressively becomes noticeable new interference.Video is used in type interference
Noise carries out the radar emission signals of intercepting and capturing the modulation in time domain, produce in time domain and frequency domain with real target echo weight
Folded and coverage goal echo signal waveform, signal energy utilization rate is high, but to interference protection measures such as echo sidelobe cancellations
Less effective.
The content of the invention
The purpose of the present invention is to solve decoy flight path it is uncorrelated when easily offseted by Radar cross-section redaction, pressure can not be played
The effect of standard interference and propose the problem of the less effective to interference protection measures such as echo sidelobe cancellations based on speed
The smart munition noise signal design method towed.
Above-mentioned goal of the invention is achieved through the following technical solutions：
Step 1: after the electromagnetic signal for calculating radar emission is irradiated to target, the rescattering by target returns to thunder
Up to the time delay τ of antenna；
Step 2: after the electromagnetic signal for calculating radar emission is irradiated to target, the rescattering by target returns to thunder
Up to the Doppler frequency shift f of antennad；
Step 3: after the electromagnetic signal for calculating radar emission is irradiated to target, the rescattering by target returns to thunder
Up to the range value A of antenna t moment target echo signalt；
Step 4: assume that radar emission signal is st(t), then target echo signal sr(t) expression formula is：
In formula, e is natural logrithm；J is imaginary unit；G is the reception gain of radar antenna, and γ is the reception of radar antenna
Efficiency；RtFor the radial distance between t moment target and radar；λ is the operation wavelength of radar；
Step 5: speed tracting；According to radar echo signal sr(t), speed tracting interference signal is believed compared to target echo
Number add Doppler frequency shift fdOffset, i.e.,：
sr(t)=At exp[j(ωc+ωd+△ω)(t-2Rt/c)] (14)
In formula, AtFor the range value of t moment target echo；ωcFor radar emission signal frequency；ωdIt is the opposite radar of target
Doppler frequency caused by radial motion；△ ω are frequency departure of the keeper signal relative to real motion target, are interference
Signal tows speed in the corresponding Doppler frequency of radar observation radially projecting；RtIt is the radial direction between t moment target and radar
Distance；C is the light velocity, i.e. propagation velocity of electromagnetic wave；
The corresponding speed gate pull-off jamming signal Doppler frequency shift f of △ ω in formula (14)d' change procedure represent
For：
In formula, vfSpeed is towed in the corresponding Algorithm for Doppler Frequency Rate-of-Change of radar observation radially projecting, list for interference signal
Position Hz/s, vf(t-t1) it is that interference signal tows speed in the corresponding Doppler frequency of radar observation radially projecting, wherein vf≤
2a/λ；A is the peak acceleration of radar lock on；t1For radar speed track circuit capture time, generally 0.5s~
2s；TjFor the smart munition noise signal simulation time based on speed tracting；t2For speed tracting Disturbance and deceit finish time.
Invention effect
The present invention is from the radar smart noise jamming signal based on Convolution Modulation, combining target echo-signal flight path phase
Pass technology, is devised a kind of interference waveform for being combined speed tracting deception and Convolution Modulation dexterity noise, is had concurrently with enhancing
Deception and the smart noise jamming effect of noise jamming, and interference effect to the signal form etc. has carried out emulation and has tested
Card.
Object of the present invention is to provide smart munition noise signal ripple under a kind of true complex environment to design, its form
It is simple in structure to be easily achieved and have very strong practical application potential quality, enhance the dexterous noise for having deception and noise jamming concurrently
Interference effect.It is an object of the invention to provide new dexterous noise signal ripple design method, improves in actual electronic countermeasure
Antagonism.It is dexterous dry in analysis Convolution Modulation for the dexterous noise Anti-Jamming Technique such as sidelobe cancellation and SLB technique
On the basis of the working mechanism for disturbing noise signal, speed tracting deception is introduced, it is proposed that the smart munition noise based on speed tracting
Signal waveform designs；
One as the present invention is innovated, by the way that speed tracing ripple door is towed out from the Doppler frequency of real goal,
So that radar is lost target Doppler frequency and can not correctly be tracked, i.e.,：
sr(t)=At exp[j(ωc+ωd+△ω)(t-2Rt/c)]
In formula, △ ω are frequency departure of the keeper signal relative to real goal.How general speed gate pull-off jamming signal is
The change procedure for strangling frequency is expressed as：
In formula, fdFor the Doppler frequency of true echo-signal, vf(Hz/s) speed is towed for interference signal, its value is little
In the peak acceleration of radar lock on, i.e. vf≤2a/λ。
The purpose of the present invention is design to improve destruction or hinder radar to target by new more practical signal wave
Frequency sonding ability, improve survival ability.Implementation method is：
Radar is effectively disturbed just to make full use of the work characteristics of radar equipment to the acquisition and tracking ability of target,
Radar tracking system is implemented to disturb from energy, distance, speed and angle many aspects.Therefore the effective noise signal of structure must
Must have the characteristics that following two：
1) there is high density decoy, the echo of real goal can be covered；
2) angel echoes in noise signal do not require nothing more than has identical intrapulse modulation characteristic with real goal echo,
And the flight path of angel echoes must be related, to resist the interference protection measures such as sidelobe cancellation.
Based on above feature, the flight path correlation of angel echoes reenters movement difference equations by target aircraft in the present invention
Realize velocity correlation.
The present invention compares situation when being not added with speed tracting originally, there is good lifting in terms of the pressurization system of deception, because
Response situation is different under different situations, but in general, capability improving scope is in 30%-60% such as Fig. 3 and Fig. 4.
The present invention is directed to the reality of the anti-sidelobe cancellation less effective of smart munition noise, combining target echo flight path correlation skill
Art, devises a kind of new interference signal form for being combined speed tracting deception and Convolution Modulation dexterity noise, with enhancing
Have the smart noise jamming effect of deception and noise jamming concurrently.Surveyed the advantage of the invention is that the Waveform Design destroys radar
Stability away from system tracking loop, enhances deception and the pressing result of interference signal so that common echo sidelobe cancellation
The interference protection measures such as processing, echo peak signal MTD, MTD-CFAR fail.The present invention is shown by simulation analysis：Based on speed
The smart noise jamming signal form towed has reached design effect, has engineering application value.
Main advantages of the present invention are embodied in：It can realize the stability for destroying radar ranging system tracking loop, enhancing
The deception of interference signal and pressing result so that common echo sidelobe cancellation processing, echo peak signal MTD, MTD-
The interference protection measures such as CFAR fail, and improve practicality.Such as Fig. 5 (a), Fig. 5 (b), Fig. 6 and Fig. 7.
The present invention use smart noise jamming realization method consider video noise signal be considered as many amplitudes at random
Shock pulse string, therefore video noise signal is made into shock pulse falsification, and with linear FM signal convolution, then the interference produced
It is equivalent to the sum of intensive linear FM signal of many amplitude random delay.
Setting video noise is n (t), and the interference echo that video noise is produced with radar signal convolution is：
The result of matched filtering is：
From time domain, the result that the interference waveform of so modulation formation is compressed through extra pulse is just decided by mutually to roll up therewith
Long-pending video noise.And interference signal can obtain part or all of gain after pulse compression, produce intensive decoy,
The effect of deception and pressing type interference is taken into account at the same time.Analyzed from frequency domain, convolution is multiplied equivalent to frequency domain, linear frequency modulation letter
It is [f number to be considered as passband0-B/2,f0- B/2] bandpass filter, therefore produce Convolution Modulation interference when, do not carrying out
In the case of frequency alignment can coverage goal echo frequency domain, interference can fully enter receiver, greatly improve dry
Disturb utilization rate.
Brief description of the drawings
Fig. 1 (a) is Hybrid-modulated Signal (13 Barker code+linear frequency modulations) radar emission signal waveform that embodiment proposes
Figure；
Fig. 1 (b) is signal spectrum radar emission signal waveforms in the code of embodiment proposition；
Fig. 2 is that the preferable radar echo pulse that embodiment proposes compresses handling result；
Fig. 3 is the echo-signal (time domain) for 3 decoys that embodiment proposes；
Fig. 4 is the echo-signal (frequency domain) for 3 decoys that embodiment proposes；
Fig. 5 (a) is 3 target echo sidelobe cancellation handling result real part schematic diagrames that embodiment proposes；
Fig. 5 (b) is 3 target echo sidelobe cancellation handling result imaginary part schematic diagrames that embodiment proposes；
Fig. 6 is 3 target echo peak signal MTD handling results that embodiment proposes；
Fig. 7 is 3 target echo MTD-CFAR handling results (using constant false alarm handling result) that embodiment proposes；
Fig. 8 is that the dexterous noise signal based on speed tracting that embodiment proposes produces block diagram.
Embodiment
Embodiment one：The smart munition noise signal design method based on speed tracting of present embodiment, tool
Body is prepared according to following steps：
Step 1: after the electromagnetic signal of interference echo guinea pig transmitting is irradiated to target, by the rescattering of target
Back to radar antenna；At this time, the echo-signal of target is compared with the transmitting signal of radar, in time, frequency and amplitude
Obvious change occurs for three aspects；After the electromagnetic signal of calculating radar emission is irradiated to target, by the rescattering of target
Back to the time delay τ of radar antenna；The size of the time delay reflects radial distance of the target relative to radar；
Step 2: after the electromagnetic signal for calculating radar emission is irradiated to target, the rescattering by target returns to thunder
Up to the Doppler frequency shift f of antennad；
Step 3: after the electromagnetic signal for calculating radar emission is irradiated to target, the rescattering by target returns to thunder
Up to the range value A of antenna t moment target echo signalt；
Step 4: based on Step 1: two and three, it is assumed that radar emission signal is st(t), then target echo signal sr(t)
Expression formula is：
In formula, e is natural logrithm；J is imaginary unit；G is the reception gain of radar antenna, and γ is the reception of radar antenna
Efficiency；RtFor the radial distance between t moment target and radar；λ is the operation wavelength of radar；
Step 5: speed tracting；The purpose of speed tracting interference is exactly destruction or hinders frequency sonding of the radar to target,
By the way that speed tracing ripple door is towed out from the Doppler frequency of real goal so that radar loses target Doppler frequency and nothing
Method is correctly tracked；According to radar echo signal sr(t), speed tracting interference signal adds more compared to target echo signal
General Le frequency displacement fdOffset, i.e.,：
sr(t)=At exp[j(ωc+ωd+△ω)(t-2Rt/c)] (14)
In formula, AtFor the range value of t moment target echo；ωcFor radar emission signal frequency；ωdIt is the opposite radar of target
Doppler frequency caused by radial motion；△ ω are frequency departure of the keeper signal relative to real motion target, are interference
Signal tows speed in the corresponding Doppler frequency of radar observation radially projecting；RtIt is the radial direction between t moment target and radar
Distance；C is the light velocity, i.e. propagation velocity of electromagnetic wave；
The corresponding speed gate pull-off jamming signal Doppler frequency shift f of △ ω in formula (14)d' change procedure represent
For：
In formula, vfSpeed is towed in the corresponding Algorithm for Doppler Frequency Rate-of-Change of radar observation radially projecting, list for interference signal
Position Hz/s, vf(t-t1) it is that interference signal tows speed in the corresponding Doppler frequency of radar observation radially projecting, wherein vf≤
2a/λ；A is the peak acceleration of radar lock on；t1For radar speed track circuit capture time, generally 0.5s~
2s；t2-t1For speed tracting Disturbance and deceit time, t2-t1It should be slightly bigger than the capture time and AGC electricity of radar speed tracking circuit
The sum of road recovery time, is generally 0.5s~2s, and during which pull-off jamming signal makes radar speed tracking loop progressively disengage originally
The true Doppler frequency of target of tracking；Tj-t2It is stopped the phase for interference signal, generally more than 3s；TjTo be dragged based on speed
The smart munition noise signal simulation time drawn；t2For speed tracting Disturbance and deceit finish time.
Present embodiment effect：
Present embodiment is from the radar smart noise jamming signal based on Convolution Modulation, combining target echo-signal boat
Mark correlation technique, devises a kind of interference waveform for being combined speed tracting deception and Convolution Modulation dexterity noise, with enhancing
Have the smart noise jamming effect of deception and noise jamming concurrently, and interference effect to the signal form etc. is emulated
Verification.
The purpose of present embodiment is the provision of smart munition noise signal ripple under a kind of true complex environment and designs, its
Form structure is simply easily achieved and has very strong practical application potential quality, enhances the dexterity for having deception and noise jamming concurrently
Noise jamming effect.The purpose of present embodiment is to provide new dexterous noise signal ripple design method, the actual electronics of raising
Antagonism in confrontation.For the dexterous noise Anti-Jamming Technique such as sidelobe cancellation and SLB technique, in analysis convolution tune
On the basis of the working mechanism of smart munition noise signal processed, speed tracting deception is introduced, it is proposed that the dexterity based on speed tracting
Interfering noise signal Waveform Design；
As an innovation of present embodiment, by the way that speed tracing ripple door is dragged from the Doppler frequency of real goal
Open so that radar is lost target Doppler frequency and can not correctly be tracked, i.e.,：
sr(t)=At exp[j(ωc+ωd+△ω)(t-2Rt/c)]
In formula, △ ω are frequency departure of the keeper signal relative to real goal.How general speed gate pull-off jamming signal is
The change procedure for strangling frequency is expressed as：
In formula, fdFor the Doppler frequency of true echo-signal, vf(Hz/s) speed is towed for interference signal, its value is little
In the peak acceleration of radar lock on, i.e. vf≤2a/λ。
The purpose of present embodiment is designed by new more practical signal wave to improve destruction or hinder radar pair
The ability of the frequency sonding of target, improves survival ability.Implementation method is：
Radar is effectively disturbed just to make full use of the work characteristics of radar equipment to the acquisition and tracking ability of target,
Radar tracking system is implemented to disturb from energy, distance, speed and angle many aspects.Therefore the effective noise signal of structure must
Must have the characteristics that following two：
1) there is high density decoy, the echo of real goal can be covered；
2) angel echoes in noise signal do not require nothing more than has identical intrapulse modulation characteristic with real goal echo,
And the flight path of angel echoes must be related, to resist the interference protection measures such as sidelobe cancellation.
Based on above feature, the flight path correlation of angel echoes reenters movement side by target aircraft in present embodiment
Journey group realizes velocity correlation.
Present embodiment compares situation when being not added with speed tracting originally, there is good carry in terms of the pressurization system of deception
Rise, because response situation is different under different situations, but in general, capability improving scope is in 30%-60% such as Fig. 3 and Fig. 4.
Present embodiment is directed to the reality of the anti-sidelobe cancellation less effective of smart munition noise, combining target echo flight path phase
Pass technology, devises a kind of new interference signal form for being combined speed tracting deception and Convolution Modulation dexterity noise, with
Enhancing has the smart noise jamming effect of deception and noise jamming concurrently.Advantage of this embodiment is that the Waveform Design is broken
The stability of bad radar ranging system tracking loop, enhances deception and the pressing result of interference signal so that common echo
The interference protection measures such as sidelobe cancellation processing, echo peak signal MTD, MTD-CFAR fail.Present embodiment passes through simulation analysis
Show：Smart noise jamming signal form based on speed tracting has reached design effect, has engineering application value.
The major advantage of present embodiment is embodied in：It can realize the stability for destroying radar ranging system tracking loop,
Enhance deception and the pressing result of interference signal so that common echo sidelobe cancellation processing, echo peak signal MTD,
The interference protection measures such as MTD-CFAR fail, and improve practicality.Such as Fig. 5 (a), Fig. 5 (b), Fig. 6 and Fig. 7.
Present embodiment use smart noise jamming realization method in view of video noise signal be considered as many amplitudes for
The shock pulse string of machine, therefore video noise signal is made into shock pulse falsification, and with linear FM signal convolution, then produce
Interference is equivalent to the sum of intensive linear FM signal of many amplitude random delay.
Setting video noise is n (t), and the interference echo that video noise is produced with radar signal convolution is：
The result of matched filtering is：
From time domain, the result that the interference waveform of so modulation formation is compressed through extra pulse is just decided by mutually to roll up therewith
Long-pending video noise.And interference signal can obtain part or all of gain after pulse compression, produce intensive decoy,
The effect of deception and pressing type interference is taken into account at the same time.Analyzed from frequency domain, convolution is multiplied equivalent to frequency domain, linear frequency modulation letter
It is [f number to be considered as passband0-B/2,f0- B/2] bandpass filter, therefore produce Convolution Modulation interference when, do not carrying out
In the case of frequency alignment can coverage goal echo frequency domain, interference can fully enter receiver, greatly improve dry
Disturb utilization rate.
Embodiment two：The present embodiment is different from the first embodiment in that：The time prolongs described in step 1
τ is specially late：
τ=2Rt/c (11)
In formula, τ is time delay of the target echo signal relative to transmitting signal.Other steps and parameter and embodiment
One is identical.
Embodiment three：The present embodiment is different from the first and the second embodiment in that：Pass through described in step 2
The rescattering of target returns to the Doppler frequency shift f of radar antennadSpecially：
When, there are during relative radial motion, the frequency of target echo signal will change, that is, send out between target and radar
Raw Doppler effect；Due to the influence of Doppler effect, there are Doppler compared with tranmitting frequency for the frequency of target echo signal
Frequency displacement fdExpression formula is：
In formula,It is target range radar RtWhen target relative to radar radial velocity.Other steps and parameter and tool
Body embodiment one or two is identical.
Embodiment four：Unlike one of present embodiment and embodiment one to three：Described in step 3
Range value AtSpecially：
Due to scattering process of the target to electromagnetic wave, only part energy is reflected along the incident direction of radar electromagnetic wave
Save the situation line.The degree of amplitude fading is heavily dependent on the Radar Cross Section (RCS) of target, in addition, additionally depending on
The influence of various factors in the various losses of system and communication process.Other steps and parameter and embodiment one to three
One of it is identical.
Embodiment five：Unlike one of present embodiment and embodiment one to four：Described in step 5
t1For 0.5s~2s.Other steps and parameter are identical with one of embodiment one to four.
Beneficial effects of the present invention are verified using following embodiments：
Embodiment one：
Smart munition noise signal design method of the present embodiment based on speed tracting, specifically prepares according to following steps
's：
Generate ballistic trajectory
Smaller in view of the range of target reentry stage, the flight time is shorter, it is therefore assumed that target is flat in reentry stage movement
Face is moved, and establishing the reentry stage movement difference equations under velocity coordinate system is：
Wherein, V is the flight speed (m/s) of target；X is the air drag (N) suffered by target；M is aimed quality (kg)；
G is gravity acceleration magnitude (m/s2)；R is target the earth's core radius vector size (m)；Θ is speed to local horizontal line inclination angle (rad)；
βeFor target flight when angle of range (rad).
For above-mentioned analysis, the present embodiment is obtained according to hypothesis target in the position in space and stressing conditions, emulation first
Three flight paths for meeting Target Motion Character；Secondly according to the position of the radar chaff target detected in advance, war technical indicator and
Wave character produces radar target signal；Then speed tracting is carried out to multi-false targets echo-signal, finally using Rayleigh
Noise signal carries out Convolution Modulation and produces smart noise jamming.Signal produces block diagram and sees Fig. 8, and radar is set with jammer simulation parameter
Put and be shown in Table 1.
1 radar of table and jammer running parameter
Smart noise jamming signal simulation based on speed tracting is carried out according to the radar of hypothesis and jammer running parameter,
The result is shown in attached drawing, wherein Fig. 1 (a)~Fig. 2 is ideally radar emission signal waveform and target echo pulse pressure handling result；
Fig. 3~Fig. 4 is the time domain and frequency domain figure of 3 target echoes based on speed tracting, and Fig. 5 (a)~Fig. 7 is using fixed clutter pair
The technology that disappears and MTD technologies carry out object detection results to the smart noise jamming signal based on speed tracting.
It can be seen that from above simulation analysis result and taken advantage of using the smart noise jamming signal based on speed tracting having concurrently
While deceiving and suppress radar chaff performance, the speed tracting deception of introducing destroys the stabilization of radar ranging system tracking loop
Property so that common interference protection measure failure in radar electronic warfare, has reached expected design effect；
The new smart munition noise signal waveforms design method based on speed tracting proposed according to the present invention, is radar
Electronic countermeasure proposes new thinking.
The present invention can also have other various embodiments, in the case of without departing substantially from spirit of the invention and its essence, this area
Technical staff makes various corresponding changes and deformation in accordance with the present invention, but these corresponding changes and deformation should all belong to
The protection domain of appended claims of the invention.
Claims (4)
1. the smart munition noise signal design method based on speed tracting, it is characterised in that this method is specifically according to following
What step carried out：
Step 1: after the electromagnetic signal for calculating radar emission is irradiated to target, the rescattering by target returns to radar day
The time delay τ of line；
Step 2: after the electromagnetic signal for calculating radar emission is irradiated to target, the rescattering by target returns to radar day
The Doppler frequency shift f of lined；
Step 3: after the electromagnetic signal for calculating radar emission is irradiated to target, the rescattering by target returns to radar day
The range value A of line t moment target echo signalt；
Step 4: assume that radar emission signal is st(t), then target echo signal sr(t) expression formula is：
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<mn>13</mn>
<mo>)</mo>
</mrow>
</mrow>
In formula, e is natural logrithm；J is imaginary unit；G is the reception gain of radar antenna, and γ is that the reception of radar antenna is imitated
Rate；RtFor the radial distance between t moment target and radar；λ is the operation wavelength of radar；
Step 5: speed tracting；According to radar echo signal sr(t), speed tracting interference signal is compared to target echo signal increase
Doppler frequency shift fdOffset, i.e.,：
sr(t)=Atexp[j(ωc+ωd+△ω)(t-2Rt/c)] (14)
In formula, AtFor the range value of t moment target echo；ωcFor radar emission signal frequency；ωdFor target with respect to radar radially
Doppler frequency caused by movement；△ ω for keeper signal relative to the frequency departure of real motion target, be interference signal
Speed is towed in the corresponding Doppler frequency of radar observation radially projecting；RtIt is the radial distance between t moment target and radar；
C is the light velocity, i.e. propagation velocity of electromagnetic wave；
The corresponding speed gate pull-off jamming signal Doppler frequency shift f of △ ω in formula (14)d' change procedure be expressed as：
In formula, vfSpeed is towed in the corresponding Algorithm for Doppler Frequency Rate-of-Change of radar observation radially projecting, unit Hz/ for interference signal
S, vf(t-t1) it is that interference signal tows speed in the corresponding Doppler frequency of radar observation radially projecting, wherein vf≤2a/λ；a
For the peak acceleration of radar lock on；t1The capture time of circuit is tracked for radar speed；TjFor the spirit based on speed tracting
Skilful interfering noise signal simulation time；t2For speed tracting Disturbance and deceit finish time.
2. the smart munition noise signal design method based on speed tracting according to claim 1, it is characterised in that：Step
Time delay τ described in one is specially：
τ=2Rt/c (11)
In formula, τ is time delay of the target echo signal relative to transmitting signal.
3. the smart munition noise signal design method based on speed tracting according to claim 2, it is characterised in that：Step
Two rescatterings by target return to the Doppler frequency shift f of radar antennadSpecially：
When there are during relative radial motion, Doppler effect occurs between target and radar；The frequency and hair of target echo signal
Radio frequency rate is compared to there are Doppler frequency shift fdExpression formula is：
<mrow>
<msub>
<mi>f</mi>
<mi>d</mi>
</msub>
<mo>=</mo>
<mn>2</mn>
<msub>
<mi>v</mi>
<msub>
<mi>R</mi>
<mi>t</mi>
</msub>
</msub>
<mo>/</mo>
<mi>&lambda;</mi>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>12</mn>
<mo>)</mo>
</mrow>
</mrow>
In formula,It is target range radar RtWhen target relative to radar radial velocity.
4. the smart munition noise signal design method based on speed tracting according to claim 3, it is characterised in that：Step
Five t1For 0.5s~2s.
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| US10656248B2 (en) * | 2017-05-11 | 2020-05-19 | GM Global Technology Operations LLC | Radar post processing for sidelobe suppression |
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| CN108196229B (en) * | 2018-02-11 | 2022-01-28 | 哈尔滨工业大学 | Communication radar integrated design method based on time modulation array |
| CN110231615B (en) * | 2019-05-17 | 2023-05-16 | 北京理工大学 | Distance measurement anomaly discrimination method based on sea surface target space constraint |
| CN110971335B (en) * | 2019-11-25 | 2023-12-22 | 维沃移动通信有限公司 | Signal processing method and device and electronic equipment |
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| CN113671452B (en) * | 2021-08-09 | 2023-08-29 | 成都众享天地网络科技有限公司 | Active interference simulation design method for synchronous towing of distance and speed |
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