CN108120963A - A kind of radar signal interference method and radar signal jammer - Google Patents
A kind of radar signal interference method and radar signal jammer Download PDFInfo
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- CN108120963A CN108120963A CN201711431366.4A CN201711431366A CN108120963A CN 108120963 A CN108120963 A CN 108120963A CN 201711431366 A CN201711431366 A CN 201711431366A CN 108120963 A CN108120963 A CN 108120963A
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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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Abstract
The invention discloses a kind of radar signal interference method and radar signal jammer, which includes：The radar signal that emission source is sent is obtained, and impulse radar signal is generated according to radar signal；Impulse radar signal and noise signal are subjected to process of convolution, form Convolution jamming signal；Convolution jamming signal is emitted to emission source.Radar signal interference method and radar signal jammer provided in an embodiment of the present invention, since impulse radar signal and noise signal are carried out process of convolution, form Convolution jamming signal so that for the jamming-to-signal ratio of Convolution jamming signal compared to conventional interference signal, jamming-to-signal ratio improves more than 1400 times.Compared to traditional interference signal, Convolution jamming signal has relatively low input power and better interference effect, solves the problems, such as to need high-power interference signal in existing Radar Technology existing for Barrage radio jamming.
Description
Technical field
The present invention relates to Radar Technology fields, and in particular to a kind of radar signal interference method and radar signal jammer.
Background technology
The anti-interference of radar is two aspects of contradiction, has radar just to have interference, has interference that will go out
It is existing anti-interference, and new conflicting mode also can with appearance.So Xun Huan is more than, promotes perturbation technique and Anti-Jamming Technique
Advance.Divide by source, radar chaff be divided into intentionally it is active, unintentionally it is passive, unintentionally it is active, be not intended to passive four major class.Its
In, the intentional active interference to radar, also referred to as actively interference, and two kinds are disturbed including Barrage radio jamming and duplicity.
In existing Barrage radio jamming technology, the interference signal that receives of radar is calculated using the following formula (1)
Power Prj：
Prj=(PjGjAr'/4πRj 3)×(Δf/(Δf)j) (1)
Wherein, PjRepresent the input power of interference；GjRepresent jammer against the antenna gain of radar direction；Ar' represent thunder
Up to reception antenna against the effective area in jammer direction；RjRepresent jammer to the distance of radar；(Δf)jRepresent interference frequency
Band；Δ f represents the bandwidth of radar receiver, under normal circumstances, Δ f≤(Δ f)j。
For useful target, the power P for the interference signal that the target that radar receiver receives is reflectedr,
It is calculated using the following formula (2)：
Wherein, PtRepresent transmitting signal power；GtRepresent the gain of transmitting antenna；GrRepresent the gain of reception antenna；λ tables
Show radar operation wavelength；R represents the distance of reconnaissance range, i.e. target to radar receiver.
The echo-signal of interference signal and target is together into radar receiver, from formula (2), the work(of interference signal
Inversely, i.e., jamming power is bigger, and radar can identify that the distance of target is shorter for the quadratic power of rate and reconnaissance range R.
That is traditional Barrage radio jamming will effectively disturb target, it is for cost with powerful input.In reality
In, the power of interference signal will not increase always, always there is the upper limit of the power, and when target range is far, even if increasing
The power of big interference signal will not reach satisfied interference effect.
The content of the invention
In view of this, an embodiment of the present invention provides a kind of radar signal interference method and radar signal jammer, with solution
The problem of needing high-power interference signal existing for Barrage radio jamming in certainly existing Radar Technology.
According in a first aspect, an embodiment of the present invention provides a kind of radar signal interference methods, comprise the following steps：It obtains
The radar signal that emission source is sent, and impulse radar signal is generated according to the radar signal；By the impulse radar signal with
Noise signal carries out process of convolution, forms Convolution jamming signal；The Convolution jamming signal is emitted to the emission source.
Radar signal interference method provided in an embodiment of the present invention, since impulse radar signal being rolled up with noise signal
Product processing, forms Convolution jamming signal so that the jamming-to-signal ratio of Convolution jamming signal is believed compared to conventional interference signal, i.e. noise
Number jamming-to-signal ratio improve more than 1400 times, i.e., the amplitude of interference signal is improved more than 1400 times by process of convolution, is converted into
Process of convolution is can be understood as into decibels so that the jamming-to-signal ratio of interference signal improves about 30 decibels.It is done compared to traditional
Signal is disturbed, Convolution jamming signal has relatively low input power and better interference effect, solves and hidden in existing Radar Technology
The problem of needing high-power interference signal existing for lid interference.
With reference to first aspect, in first aspect first embodiment, according to the following formula to the impulse radar signal
Process of convolution is carried out with noise signal：
Wherein, Jm(t) noise signal is represented, s (t- τ) represents impulse radar signal, and J (t) represents Convolution jamming signal.
Radar signal interference method provided in an embodiment of the present invention, using formula by impulse radar signal and noise signal into
Row process of convolution, calculating process more simplify.
With reference to first aspect, in first aspect second embodiment, the noise signal is white noise.
Radar signal interference method provided in an embodiment of the present invention, use white noise the most common form Convolution jamming letter
Number, suitable for most application scenario.
According to second aspect, an embodiment of the present invention provides a kind of radar signal jammer, including：Receiving module is used for
The radar signal that emission source is sent is obtained, and impulse radar signal is generated according to the radar signal；Noise module, for generating
Noise signal；Convolution module for the impulse radar signal and noise signal to be carried out process of convolution, forms Convolution jamming letter
Number；Transmitting module, for emitting the Convolution jamming signal to the emission source.
According to the third aspect, an embodiment of the present invention provides a kind of electronic equipment, including：Signal receiving device, signal hair
Injection device, memory and processor, the signal receiving device, the sender unit, the memory and the processing
Connection is communicated between device, computer instruction is stored in the memory, the processor is by performing the computer
Instruction, so as to perform the radar signal interference method as described in first aspect embodiment.
It is described computer-readable an embodiment of the present invention provides a kind of computer readable storage medium according to fourth aspect
Storage medium is stored with computer instruction, and the computer instruction is used to that the computer to be made to perform such as first aspect embodiment institute
The radar signal interference method stated.
Description of the drawings
The features and advantages of the present invention can be more clearly understood by reference to attached drawing, attached drawing is schematically without that should manage
It solves to carry out any restrictions to the present invention, in the accompanying drawings：
Fig. 1 shows the flow chart of a specific example of the radar signal interference method in the embodiment of the present invention；
Fig. 2 shows the waveform of traditional interference signal and Convolution jamming signal；
Fig. 3 shows waveform through the compressed Convolution jamming signal of extra pulse and believes through the compressed echo of extra pulse
Number waveform；
Fig. 4 shows that probability of detection is to the cluster relation curve of jamming-to-signal ratio during using false-alarm probability as parameter；
Fig. 5 shows the functional block diagram of a specific example of the radar signal jammer in the embodiment of the present invention；
Fig. 6 shows the functional block diagram of a specific example of the electronic equipment in the embodiment of the present invention.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those skilled in the art are not having
All other embodiments obtained under the premise of creative work are made, belong to the scope of protection of the invention.
Fig. 1 shows a kind of radar signal interference method that the embodiment of the present invention proposes, which can
To comprise the following steps：
Step S101：The radar signal that emission source is sent is obtained, and impulse radar signal is generated according to radar signal；
Step S102：Impulse radar signal and noise signal are subjected to process of convolution, form Convolution jamming signal；
Step S103：Convolution jamming signal is emitted to emission source.
In a specific embodiment, for step S102 shown in FIG. 1, formula (3) may be employed and carry out process of convolution
And form Convolution jamming signal：
Wherein, Jm(t) noise signal is represented, s (t- τ) represents impulse radar signal, and J (t) represents Convolution jamming signal.
In a specific embodiment, in step S102 shown in FIG. 1, noise signal can be white noise.
For step S103 shown in FIG. 1, Convolution jamming signal enters emission source, and after radar receiver, radar connects
The process that receipts machine carries out Convolution jamming signal process of pulse-compression can utilize formula (4) to represent：
By above formula as it can be seen that after process of pulse-compression, output obtains a noise with Sa convolution of functions, if Sa
Approximation to function is shock pulse, then what is obtained after extra pulse is compressed is exactly for forming the noise signal of Convolution jamming signal.
Fig. 2 shows traditional interference signal, such as the waveform 202 of white noise signal and the waveform of Convolution jamming signal
201.As seen from Figure 2, in baseband noise under the same conditions, Convolution jamming has amplitude more stronger than conventional interference signal
(also being understood as power) inputs.
In step S103 shown in FIG. 1, Convolution jamming signal can echo letter corresponding with the radar signal that emission source is sent
The reception device of the corresponding radar system of emission source is inputted number together, respectively enters bandpass filter and pulse shortener.By
Radar system pulse compression after, echo-signal is compressed to a burst pulse, and Convolution Modulation noise is then broadened, and when
The time width of compression prepulse has been paved in domain, echo-signal can be covered.Fig. 3 is shown through the compressed Convolution jamming of extra pulse
The waveform 301 of signal and the waveform 302 through the compressed echo-signal of extra pulse.As shown in figure 3, by pulse pressure back echo
Signal is submerged in Convolution jamming signal completely, it is difficult to detect.
Convolution jamming signal is analyzed in terms of constant false alarm below.Due to after the wave detector of radar receiver,
The voltage probability density function of noise signal submits to rayleigh distributed, and therefore, Convolution jamming signal is defeated by wave detector as noise
Go out to still conform to rayleigh distributed, as shown in formula (5)：
Wherein, σ is input noise variance, represents the noise variance of Convolution jamming signal herein；P (x) for continuity with
The probability distributing density function of machine variable represents Convolution jamming signal herein.
False-alarm probability more than thresholding ν can be calculated according to rayleigh distributed, as shown in formula (6)：
Wherein, σ is input noise variance, represents the noise variance of Convolution jamming signal herein；ν is false-alarm probability door
Limit；PfFor false-alarm probability.
Detection probability P simultaneouslyDAs shown in formula (7)：
Wherein, σ is input noise variance, represents the noise variance of Convolution jamming signal herein；U is echo-signal and volume
The voltage that product interference signal is added, ν is the thresholding corresponding to false-alarm probability, usFor the amplitude of echo-signal, I0For zero-order Bessel
Function, PDFor probability of detection.
In formula (7), zero Bessel function I0Progression form be：
Expansion obtains：
I0(x)≈1+(x/2)2+(x/2)4×1/4+(x/2)6×1/36+(x/2)8×1/576 (9)
Formula (9) is substituted into formula (7), is obtained
From above formula, detection probability PDFor the amplitude u of false-alarm probability thresholding ν, input noise variances sigma and echo-signals's
Function, and v/ σ2With false-alarm probability PfIt corresponds.Due to (us/σ)2=2 × (Ps/Pr)=2 × (S/N)=2/D, wherein PsWith
PrRepresent the Mean Input Power of echo-signal and noise respectively, S/N is input signal-to-noise ratio, and N/S is known as jamming-to-signal ratio (or letter of making an uproar
Than), in false-alarm probability PfUnder conditions of certain, one group of jamming-to-signal ratio can obtain one group of corresponding probability of detection.Compare plus disturb
Front and rear jamming-to-signal ratio, obtains：
(1) as baseband noise mean power PjWhen=13.9, the mean power P of Convolution jamming signalg=2.0 × 104, Pg/
Pj≈1.40×103；
(2) as baseband noise mean power PjWhen=347.8, the mean power P of Convolution jamming signalg=4.77 × 105,
Pg/Pj≈1.37×103；
(3) as baseband noise mean power Pj=1.4 × 103When, the mean power P of Convolution jamming signalg=2.08 ×
106, Pg/Pj≈1.48×103。
It can be seen that under identical primary condition, the jamming-to-signal ratio of Convolution jamming signal is the dry of traditional interference signal
Believe ratio more than 1400 times, therefore, under conditions of echo-signal is constant, are equal to using Convolution jamming by the noise of echo-signal
Amplitude improves 1400 times or so, and chemical conversion decibels can be understood as jamming-to-signal ratio and improve 30 decibels.
Fig. 4 is shown with false-alarm probability PfFor parameter detection probability PDTo the cluster relation curve of jamming-to-signal ratio D.In Fig. 4,
Abscissa represents detection probability PD, ordinate expression jamming-to-signal ratio D；The false-alarm probability P of every curvefIt is identical, the false-alarm of different curves
Probability PfIt is different.As shown in figure 4, in false-alarm probability PfUnder the same conditions, jamming-to-signal ratio D is higher, detection probability PDIt is smaller, i.e., it is dry
It is better to disturb effect.In identical baseband noise input, Convolution jamming makes the jamming-to-signal ratio of echo-signal much larger than noise jamming
Jamming-to-signal ratio, that is to say, that Convolution Modulation disturbs the probability of detection that can reduce radar, reaches better interference effect.
Theoretical and simulation results show, in baseband noise the input phase under the conditions of, Convolution jamming noise has traditional noise
Incomparable superiority is disturbed, relatively low input power, better interference effect imply that Convolution jamming will have extensively
Application prospect.
Fig. 5 shows a kind of radar signal jammer that the embodiment of the present invention proposes, which can wrap
Include receiving module 501, noise module 502, convolution module 503 and transmitting module 504.Wherein, receiving module 501 is sent out for obtaining
The radar signal that the source of penetrating is sent, and impulse radar signal is generated according to radar signal, particular content refers to above method embodiment
In step S101；Noise module 502 is used to generate noise signal；Convolution module 503 is used for impulse radar signal and noise
Signal carries out process of convolution, forms Convolution jamming signal, and particular content refers to the step S102 in above method embodiment；Transmitting
For module 504 for emitting Convolution jamming signal to emission source, particular content refers to the step S103 in above method embodiment.
The embodiment of the present invention additionally provides a kind of electronic equipment, is received as shown in fig. 6, the electronic equipment can include signal
Device 601, sender unit 602, memory 603 and processor 604, wherein memory 603 and processor 604 can pass through
Bus or other modes connect, in Fig. 6 exemplified by being connected by bus.
Processor 604 can be central processing unit (Central Processing Unit, CPU).Processor 604 may be used also
Think other general processors, digital signal processor (Digital Signal Processor, DSP), application-specific integrated circuit
(Application Specific Integrated Circuit, ASIC), field programmable gate array (Field-
Programmable GateArray, FPGA) either other programmable logic device, discrete gate or transistor logic,
The combination of the chips such as discrete hardware components or above-mentioned all kinds of chips.
Memory 603 is used as a kind of non-transient computer readable storage medium storing program for executing, available for storing non-transient software program, non-
Transient computer executable program and module, as the corresponding program of radar signal interference method in the embodiment of the present invention refers to
Order/module (for example, receiving module 501, noise module 502, convolution module 503 and transmitting module 504 shown in Fig. 5).Processing
Device 604 is stored in non-transient software program, instruction and module in memory 603 by operation, so as to perform processor
The radar signal interference method in above method embodiment is realized in various function application and data processing.
Memory 603 can include storing program area and storage data field, wherein, storing program area can store operation system
System, the required application program of at least one function；Storage data field can store data that processor 604 is created etc..In addition,
Memory 603 can include high-speed random access memory, can also include non-transient memory, and a for example, at least disk is deposited
Memory device, flush memory device or other non-transient solid-state memories.In some embodiments, memory 603 is optional including opposite
In the remotely located memory of processor 604, these remote memories can pass through network connection to processor 604.Above-mentioned net
The example of network includes but not limited to internet, intranet, LAN, mobile radio communication and combinations thereof.
One or more of modules are stored in the memory 603, when being performed by the processor 604, are held
Radar signal interference method in row embodiment as shown in Figure 1.
Above-mentioned electronic equipment detail can be corresponded to refering to corresponding associated description and effect in embodiment shown in FIG. 1
Understood, details are not described herein again.
It is that can lead to it will be understood by those skilled in the art that realizing all or part of flow in above-described embodiment method
Computer program is crossed relevant hardware to be instructed to complete, the program can be stored in a computer read/write memory medium
In, the program is upon execution, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic disc,
CD, read-only memory (Read-Only Memory, ROM), random access memory (RandomAccess Memory,
RAM), flash memory (Flash Memory), hard disk (Hard Disk Drive, abbreviation：) or solid state disk (Solid- HDD
State Drive, SSD) etc.；The storage medium can also include the combination of the memory of mentioned kind.
The embodiment of the present invention gives a kind of computer readable storage medium, which has
Computer instruction, the computer instruction are used to that computer to be made to perform corresponding associated description in embodiment as shown in Figure 1.
Although being described in conjunction with the accompanying the embodiment of the present invention, those skilled in the art can not depart from the present invention
Spirit and scope in the case of various modification can be adapted and modification, such modifications and variations are each fallen within by appended claims institute
Within the scope of restriction.
Claims (6)
1. a kind of radar signal interference method, which is characterized in that comprise the following steps：
The radar signal that emission source is sent is obtained, and impulse radar signal is generated according to the radar signal；
The impulse radar signal and noise signal are subjected to process of convolution, form Convolution jamming signal；
The Convolution jamming signal is emitted to the emission source.
2. radar signal interference method according to claim 1, which is characterized in that according to the following formula to the base band thunder
Process of convolution is carried out up to signal and noise signal：
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<mi>t</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<msubsup>
<mo>&Integral;</mo>
<mrow>
<mo>-</mo>
<mi>&infin;</mi>
</mrow>
<mi>&infin;</mi>
</msubsup>
<msub>
<mi>J</mi>
<mi>m</mi>
</msub>
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<mo>(</mo>
<mi>&tau;</mi>
<mo>)</mo>
</mrow>
<mi>s</mi>
<mrow>
<mo>(</mo>
<mi>t</mi>
<mo>-</mo>
<mi>&tau;</mi>
<mo>)</mo>
</mrow>
<mi>d</mi>
<mi>&tau;</mi>
<mo>,</mo>
</mrow>
Wherein, Jm(t) noise signal is represented, s (t- τ) represents impulse radar signal, and J (t) represents Convolution jamming signal.
3. radar signal interference method according to claim 1, which is characterized in that the noise signal is white noise.
4. a kind of radar signal jammer, which is characterized in that including：
Receiving module for obtaining the radar signal that emission source is sent, and generates impulse radar signal according to the radar signal；
Noise module, for generating noise signal；
Convolution module for the impulse radar signal and noise signal to be carried out process of convolution, forms Convolution jamming signal；
Transmitting module, for emitting the Convolution jamming signal to the emission source.
5. a kind of electronic equipment, which is characterized in that including：
Signal receiving device, sender unit, memory and processor, the signal receiving device, signal transmitting dress
It puts, communicate connection between the memory and the processor, computer instruction, the place are stored in the memory
Device is managed by performing the computer instruction, so as to perform such as the radar signal disturber any one of claim 1-3
Method.
6. a kind of computer readable storage medium, which is characterized in that the computer-readable recording medium storage has computer to refer to
Order, the computer instruction are used to that the computer to be made to perform the radar signal interference as any one of claim 1-3
Method.
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| CN113009430B (en) * | 2021-03-01 | 2023-06-30 | 西安电子科技大学 | FPGA implementation method and system of radar interference based on noise convolution |
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