CN106772280B - A kind of SAR cheating interference production method and system based on a bit sample - Google Patents
A kind of SAR cheating interference production method and system based on a bit sample Download PDFInfo
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- CN106772280B CN106772280B CN201710051048.9A CN201710051048A CN106772280B CN 106772280 B CN106772280 B CN 106772280B CN 201710051048 A CN201710051048 A CN 201710051048A CN 106772280 B CN106772280 B CN 106772280B
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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 SAR cheating interference production method and system based on a bit sample, method includes: to obtain the signal that SAR emits to be compared with predetermined threshold, generates a bit sequential sampling according to comparison result；The instantaneous oblique distance for obtaining the scattering coefficient of several to be generated False Intersection Points is poor, is quantified as discrete instantaneous oblique distance difference unit, obtains one-dimensional range profile according to instantaneous oblique distance difference unit；One bit sequential sampling and one-dimensional range profile are subjected to convolution algorithm and generate cheating interference vector；A bit sequence is generated according to the point-by-point of cheating interference vector and the comparison result of the noise threshold generated in advance；One bit sequence is amplified, and is forwarded to the disturbed SAR of needs；It in different pulse recurrence intervals, repeats the above steps, generates the cheating interference target of focusing.The present invention greatly reduces the calculation amount and computational complexity of cheating interference Convolution Modulation, reduces the cost of SAR deception jammer, and cheating interference effect is good.
Description
Technical field
The present invention relates to signal processing technology field more particularly to a kind of SAR cheating interference productions based on a bit sample
Generation method and system.
Background technique
SAR deception jammer carries out delay and phase tune according to SAR signal of the pre-designed false scene to intercepting and capturing
System, it is lower than power needed for traditional compacting interference, and endanger bigger.Wherein SAR is Synthetic Aperture
The abbreviation of Radar, Chinese translation are synthetic aperture radar.Jammer generates false target true to nature in real scene, thus
The acquisition of information and decision of SAR are upset, therefore causes the extensive concern of scholars for the research of SAR cheating interference.But with
The increase of false scene, computation complexity needed for generating cheating interference be consequently increased with operation time, this is not only to taking advantage of
The cost of jammer is deceived, also more stringent requirements are proposed to its real-time performance.In order to reduce the operation of SAR deception jammer
Amount promotes the real-time that cheating interference generates, research is needed more to be concisely and efficiently cheating interference production method.It is received using more
Machine system carries out cheating interference modulation, has carried out biggish promotion to SAR cheating interference precision and robustness.But this method is
It is intercepted and captured based on traditional high-precision signal, modulation, repeater system, however it remains the big problem of system complex, operand.
Therefore cheating interference modulator approach in the prior art, when intercepting and capturing, modulate to high-precision signal, forwarding, modulation system
System is complicated, and operand is big, improves the cost of SAR deception jammer, brings inconvenience for cheating interference modulation.
Therefore, the existing technology needs to be improved and developed.
Summary of the invention
In view of the deficiencies in the prior art, it is an object of that present invention to provide a kind of SAR cheating interferences based on a bit sample
Production method and system, it is intended to solve cheating interference modulator approach in the prior art, high-precision signal is intercepted and captured, modulation, is turned
When hair, modulating system is complicated, and operand is big, improves the cost of SAR deception jammer, for cheating interference modulation bring it is many not
Just the technical issues of.
Technical scheme is as follows:
A kind of SAR cheating interference production method based on a bit sample, wherein method comprising steps of
A, deception jammer obtains the signal of SAR transmitting, and the numerical value of the signal of SAR transmitting is compared with predetermined threshold
Compared with different sampled values, which is respectively adopted, according to different comparison results indicates, is adopted according to the bit that sampled value generates SAR signal
Sample sequence；
B, the scattering coefficient for obtaining several False Intersection Points of the confidential generation of cheating interference obtains corresponding wink according to scattering coefficient
When oblique distance it is poor, several moment oblique distance residual quantity are turned into several discrete instantaneous oblique distance difference units, it is single according to instantaneous oblique distance difference
Member obtains the data of one-dimensional range profile；
C, a bit sequential sampling and one-dimensional range profile are subjected to convolution algorithm, the cheating interference after obtaining convolution algorithm to
Amount；
D, the point-by-point of cheating interference vector is compared with the noise threshold generated in advance, generates one according to comparison result
Bit sequence；
E, a bit sequence is amplified, and is forwarded to the disturbed SAR of needs；
F, in different pulse recurrence intervals, step A~step E is repeated, generates the cheating interference mesh focused in SAR
Mark.
The SAR cheating interference production method based on a bit sample, wherein the step A specifically includes step:
A1, deception jammer obtain the signal of SAR transmitting, and the numerical value of the signal of SAR transmitting is compared with 0；
A2, the sampled value in the numerical value of the signal of SAR transmitting greater than 0 being expressed as 1, the sampled value less than 0 is expressed as 0,
The one bit sequential sampling s of SAR signal obtained according to sampled value records the range parameter A of a bit sample front signal.
The SAR cheating interference production method based on a bit sample, wherein the step B specifically includes step:
B1, obtain the confidential generation of cheating interference several False Intersection Points scattering coefficient δk, δkCorresponding instantaneous oblique distance difference is denoted as
ΔRk, the corresponding maximum oblique distance difference of False Intersection Points and minimum oblique distance difference are respectively Δ RmaxWith Δ Rmin.In Δ RmaxWith Δ RminBetween
Uniform quantization is U discrete instantaneous oblique distance difference units,
ΔR0=[Δ Rmin ΔRmin+ΔRstep … ΔRmin+(u-1)ΔRstep … ΔRmax]T
Wherein Δ RstepFor quantized interval, u=1,2 ..., U, wherein Δ Rstep=ρr/ 8, wherein ρrFor the distance point of SAR
Distinguish unit；
B2, the false scattering point target with identical instantaneous oblique distance difference is classified as the same set, it is assumed that in u-th of unit
N number of False Intersection Points are shared, then the numerical value of u-th of unit of one-dimensional range profile σ is
Wherein, taAt the time of correspondence for current PRF, δnFor scattering coefficient.
The SAR cheating interference production method based on a bit sample, wherein the step C specifically includes step:
C1, the element position of one-dimensional range profile vector σ is overturn, it is assumed that sequence originally is 1,2,3 ..., U, then
Sequence after overturning is U, U-1, U-2 ..., 1, it is expressed as σ '；
C2, a bit signal s is translated point by point, makes the point of its rear end and one-dimensional as vector σ ' is gradually weighed after overturning
It closes, until signal s translates out the range of σ ' completely, then needs to carry out M+U-1 translation altogether；
C3, the data of two vector laps are multiplied point by point after the q times translation (1≤q≤M+U-1),
Multiplication operations carry out XOR operation by a bit sample signal s and the one-dimensional highest order as vector σ ', to one-dimensional range profile to
The data bit of amount σ is retained；
C4, after being multiplied point by point to lap, the calculated result of all overlapping dot-products is subjected to summation operation, gained
Result storage to a new data vector sJQ-th of position, after translating M+U-1, obtained cheating interference sJIt is one
The vector of a (M+U-1) × 1 dimension, by sJThe maximum value of vector magnitude is denoted as AJ。
The SAR cheating interference production method based on a bit sample, wherein the step D specifically includes step:
D1, the mean value of generation Gaussian distributed is 0, variance is in advanceRandom noise, the probability of random noise is close
Degree is
The definition of Signal to Noise Ratio (SNR) is
D2, using the random noise generated in advance as the cheating interference s of noise threshold and generationJPoint-by-point comparison is carried out, when
When cheating interference is greater than the threshold value, then in a bit sequence sJ1Corresponding position be denoted as 1, be then denoted as -1 when less than the threshold value, from
And generate a bit sequence sJ1。
The SAR cheating interference production method based on a bit sample, wherein the step E specifically includes step:
E1, by a bit sequence sJ1It amplifies, amplified cheating interference is α sJ1, wherein α is amplification coefficient, can be by
Following formula is calculated
Wherein the value of β is inquired pre-set relation table according to different signal-to-noise ratio and is selected；
E2, by amplified cheating interference α sJ1The SAR disturbed to needs is forwarded.
A kind of SAR cheating interference generation system based on a bit sample, wherein system includes:
Bit sequential sampling generation module obtains the signal of SAR transmitting, and the letter that SAR is emitted for deception jammer
Number numerical value be compared with predetermined threshold, different sampled value, which is respectively adopted, according to different comparison results indicates, according to adopting
One bit sequential sampling of sample value generation SAR signal；
Data quantization module, the scattering coefficient of several False Intersection Points for obtaining the confidential generation of cheating interference, according to scattered
It is poor to penetrate the corresponding instantaneous oblique distance of coefficient acquisition, several moment oblique distance residual quantity are turned into several discrete instantaneous oblique distance difference units,
The data of one-dimensional range profile are obtained according to instantaneous oblique distance difference unit；
Convolution module, for a bit sequential sampling and one-dimensional range profile to be carried out convolution algorithm, after obtaining convolution algorithm
Cheating interference vector；
Comparison module, for the point-by-point of cheating interference vector to be compared with the noise threshold generated in advance, according to than
Relatively result generates a bit sequence；
Amplification forwarding module is forwarded for amplifying a bit sequence, and to the disturbed SAR of needs；
Cheating interference target generation module forwards a bit sequence for repeating in different pulse recurrence intervals, produces
The raw cheating interference target focused in SAR.
The SAR cheating interference generation system based on a bit sample, wherein the bit sequential sampling generates mould
Block specifically includes:
First comparing unit, for deception jammer obtain SAR transmitting signal, and by SAR transmitting signal numerical value
It is compared with 0；
Sequence generates and recording unit, and the sampled value in the numerical value of the signal for emitting SAR greater than 0 is expressed as 1, small
Sampled value in 0 is expressed as 0, the one bit sequential sampling s of SAR signal obtained according to sampled value, believes before recording a bit sample
Number range parameter A.
The SAR cheating interference generation system based on a bit sample, wherein the data quantization module is specifically wrapped
It includes:
Quantifying unit, the scattering coefficient δ of several False Intersection Points for obtaining the confidential generation of cheating interferencek, δkIt is corresponding instantaneous
Oblique distance difference is denoted as Δ Rk, the corresponding maximum oblique distance difference of False Intersection Points and minimum oblique distance difference are respectively Δ RmaxWith Δ Rmin.In Δ RmaxWith
ΔRminBetween uniform quantization be the discrete instantaneous oblique distance difference units of U,
ΔR0=[Δ Rmin ΔRmin+ΔRstep … ΔRmin+(u-1)ΔRstep … ΔRmax]T
Wherein Δ RstepFor quantized interval, u=1,2 ..., U, wherein Δ Rstep=ρr/ 8, wherein ρrFor the distance point of SAR
Distinguish unit；
One-dimensional range profile data capture unit, for that will have the false scattering point target of identical instantaneous oblique distance difference to be classified as together
One set, it is assumed that N number of False Intersection Points are shared in u-th of unit, then the numerical value of u-th of unit of one-dimensional range profile σ is
Wherein, taAt the time of correspondence for current PRF, δnFor scattering coefficient.
The SAR cheating interference generation system based on a bit sample, wherein the convolution module specifically includes:
Vector roll-over unit, for overturning the element position of one-dimensional range profile vector σ, it is assumed that sequence originally is
1,2,3 ..., U, then overturn after sequence be U, U-1, U-2 ..., 1, be expressed as σ '；
Translation unit, for a bit signal s to be translated point by point, make the point of its rear end and one-dimensional picture after overturning to
Amount σ ' is gradually overlapped, until signal s translates out the range of σ ' completely, then needs to carry out M+U-1 translation altogether；
First arithmetic element, for carrying out the q times after translating (1≤q≤M+U-1), by the number of two vector laps
According to being multiplied point by point, multiplication operations carry out XOR operation by a bit sample signal s and the one-dimensional highest order as vector σ ',
The data bit of one-dimensional range profile vector σ is retained；
Second operation and recording unit, after being used to be multiplied to lap point by point, by the calculating of all overlapping dot-products
As a result summation operation, resulting result storage to a new data vector s are carried outJQ-th of position, translation M+U-1 it
Afterwards, the cheating interference s obtainedJIt is the vector of one (M+U-1) × 1 dimension, by sJThe maximum value of vector magnitude is denoted as AJ。
The present invention provides a kind of SAR cheating interference production method and system based on a bit sample, the present invention is utilized
One bit sample technology intercepts and captures SAR signal, cheating interference is modulated and forwarding, greatly reduces cheating interference Convolution Modulation
Calculation amount and computational complexity, while but also traditional signal interception has obtained significantly simplifying with forwarding module,
The cost of SAR deception jammer is reduced, cheating interference effect is good.
Detailed description of the invention
Fig. 1 is a kind of stream of the preferred embodiment of SAR cheating interference production method based on a bit sample of the invention
Cheng Tu.
Fig. 2 is a kind of concrete application embodiment of SAR cheating interference production method based on a bit sample of the invention
Pre-set relation table schematic diagram.
Fig. 3 is a kind of concrete application embodiment of SAR cheating interference production method based on a bit sample of the invention
Real scene imaging results schematic diagram.
Fig. 4 is a kind of concrete application embodiment of SAR cheating interference production method based on a bit sample of the invention
False target imaging results schematic diagram.
Fig. 5 is a kind of concrete application embodiment of SAR cheating interference production method based on a bit sample of the invention
Be added false target after cheating interference imaging results schematic diagram.
Fig. 6 is a kind of function of the preferred embodiment of SAR cheating interference generation system based on a bit sample of the invention
It can functional block diagram.
Specific embodiment
To make the purpose of the present invention, technical solution and effect clearer, clear and definite, below to the present invention further specifically
It is bright.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The stream of the preferred embodiment of the present invention also provides a kind of SAR cheating interference production method based on a bit sample
Cheng Tu, as shown in Figure 1, method comprising steps of
S100, deception jammer obtain SAR transmitting signal, and by SAR transmitting signal numerical value and predetermined threshold into
Row compares, and different sampled values, which is respectively adopted, according to different comparison results indicates, a ratio of SAR signal is generated according to sampled value
Special sample sequence.
When it is implemented, obtaining the numerical value of the signal of SAR transmitting, and 1 is set by predetermined threshold.Then step S100 is specific
Comprising steps of
S101, deception jammer obtain the signal of SAR transmitting, and the numerical value of the signal of SAR transmitting is compared with 0；
S102, the sampled value in the numerical value of the signal of SAR transmitting greater than 0 is expressed as 1, the sampled value less than 0 is expressed as
0, the one bit sequential sampling s of SAR signal obtained according to sampled value record the range parameter A of a bit sample front signal.
When it is implemented, deception jammer intercepts and captures the numerical value of the signal of SAR transmitting, and it is compared with 0, be will be greater than
0 sampled value is expressed as 1, is expressed as 0 less than 0, so that the one bit sequential sampling s of SAR signal indicated with 0 and 1 is obtained, it
It is the vector of a M × 1 dimension.The range parameter A of a bit sample front signal is recorded simultaneously.
S200, obtain the confidential generation of cheating interference several False Intersection Points scattering coefficient, according to scattering coefficient obtain pair
It answers instantaneous oblique distance poor, several moment oblique distance residual quantity is turned into several discrete instantaneous oblique distance difference units, according to instantaneous oblique distance
Poor unit obtains the data of one-dimensional range profile.
When it is implemented, the scattering coefficient of a point refers to that this point is capable of the amplitude and phase of scatter radar wave, usually
It is a plural number, uses δ herekIt indicates.
Step S200 specifically includes step:
S201, obtain the confidential generation of cheating interference several False Intersection Points scattering coefficient δk, δkCorresponding instantaneous oblique distance difference note
For Δ Rk, the corresponding maximum oblique distance difference of False Intersection Points and minimum oblique distance difference are respectively Δ RmaxWith Δ Rmin.In Δ RmaxWith Δ RminIt
Between uniform quantization be the discrete instantaneous oblique distance difference units of U,
ΔR0=[Δ Rmin ΔRmin+ΔRstep … ΔRmin+(u-1)ΔRstep … ΔRmax]T
Wherein Δ RstepFor quantized interval, u=1,2 ..., U, wherein Δ Rstep=ρr/ 8, wherein ρrFor the distance point of SAR
Distinguish unit；Wherein Δ RstepFor quantized interval, u=1,2 ..., U.In view of the required precision of imaging algorithm range migration correction,
Δ R is enabled hereinstep=ρr/ 8, wherein ρrFor the Range resolution unit of SAR, can be obtained by the method for electronic reconnaissance.
B2, the false scattering point target with identical instantaneous oblique distance difference is classified as the same set, it is assumed that in u-th of unit
N number of False Intersection Points are shared, then the numerical value of u-th of unit of one-dimensional range profile σ is
Wherein, taAt the time of correspondence for current PRF, δnFor scattering coefficient.
When it is implemented, the scattering coefficient for assuming to need the False Intersection Points generated is δk, wherein k=1,2 ..., K.δkCorresponding wink
When oblique distance difference Δ RkCalculation method belongs to the prior art, is no longer described in detail herein.One-dimensional range profile σ is one and Δ R0Have
Identical dimension, it is the vector of a U × 1 dimension.
Different according to the demand of application, one-dimensional range profile σ refers to the composition of false target scattering point, by being calculated above
σuThe vector of the dimension of a U × 1 made of being arranged in order, each of σ vector number is usually with 16 or other precision
Multidimensional binary number representation, wherein highest order is the sign bit of data, indicates the positive and negative of data, remaining position is data bit, is indicated
The size of data.
S300, a bit sequential sampling and one-dimensional range profile are subjected to convolution algorithm, the deception after obtaining convolution algorithm is dry
Disturb vector.One bit signal s and one-dimensional range profile σ is subjected to convolution algorithm.
When it is implemented, step S300 specifically includes step:
S301, the element position of one-dimensional range profile vector σ being overturn, it is assumed that sequence originally is 1,2,3 ..., U,
Then overturn after sequence be U, U-1, U-2 ..., 1, be expressed as σ '；
S302, a bit signal s is translated point by point, make the point of its rear end and after overturning it is one-dimensional as vector σ ' gradually
It is overlapped, until signal s translates out the range of σ ' completely, then needs to carry out M+U-1 translation altogether；
S303, it carries out that the data of two vector laps are carried out point-by-point phase after the q times translation (1≤q≤M+U-1)
Multiply, multiplication operations carry out XOR operation by a bit sample signal s and the one-dimensional highest order as vector σ ', to one-dimensional range profile
The data bit of vector σ is retained；
S304, after being multiplied point by point to lap, the calculated result of all overlapping dot-products is subjected to summation operation, institute
The result obtained is stored to a new data vector sJQ-th of position, after translating M+U-1, obtained cheating interference sJIt is
The vector of one (M+U-1) × 1 dimension, by sJThe maximum value of vector magnitude is denoted as AJ。
When it is implemented, carry out the data of two vector laps after the q times translation (1≤q≤M+U-1)
Point-by-point to be multiplied, which can carry out exclusive or fortune by a bit signal s and the one-dimensional highest order (sign bit) as vector σ '
It calculates, and the one-dimensional data bit as vector is retained and is realized.
S400, the point-by-point of cheating interference vector is compared with the noise threshold generated in advance, it is raw according to comparison result
At a bit sequence.
Specifically, step S400 specifically includes step:
S401, the mean value of generation Gaussian distributed is 0, variance is in advanceRandom noise nh, the probability of random noise
Density is
S402, using the random noise generated in advance as the cheating interference s of noise threshold and generationJPoint-by-point comparison is carried out,
When cheating interference is greater than the threshold value, then in a bit sequence sJ1Corresponding position be denoted as 1, be then denoted as -1 when less than the threshold value,
To generate a bit sequence sJ1。
When it is implemented, the mean value for generating Gaussian distributed is 0, variance isRandom noise.Random noise it is general
Rate density is
The definition of Signal to Noise Ratio (SNR) is
Random noise can be configured according to different application demands, usually more than 0dB.Using the noise as threshold value
With the cheating interference s of generationJPoint-by-point comparison is carried out, when cheating interference is greater than the threshold value, then in a new bit sequence sJ1's
Corresponding position is denoted as 1, is then denoted as -1 when less than the threshold value.
S500, a bit sequence is amplified, and is forwarded to the disturbed SAR of needs.
When it is implemented, step S500 specifically includes step:
S501, by a bit sequence sJ1It amplifies, amplified cheating interference is α sJ1, wherein α is amplification coefficient, can
It is calculated by following formula
Wherein the value of β is inquired pre-set relation table according to different signal-to-noise ratio and is selected；
S502, by amplified cheating interference α sJ1The SAR disturbed to needs is forwarded.
When it is implemented, by sJ1It amplifies and is forwarded to the disturbed SAR of needs.Amplified cheating interference is
αsJ1, wherein α is amplification coefficient, can be calculated by following formula
The value of corresponding different SNR, β can according to fig. 2 in pre-set relation table in inquire and obtain, which is
The relation table of signal-to-noise ratio and β.
S600, in different pulse recurrence intervals, repeat step S100~step S500, generate and focused in SAR
Cheating interference target.
When it is implemented, pulse recurrence interval: SAR by continuously emit in certain period of time pulse signal carry out at
Picture, the time interval between two neighboring pulse signal is pulse recurrence interval.This patent is directed to the design of jammer,
So needing jammer to pass through the means of electronic reconnaissance to obtain the pulse recurrence interval of SAR.
After SAR receives echo-signal, need to carry out range pulse compression, range curvature correction, Azimuth Compression etc.
A series of processing of standardization and then obtain SAR image.After carrying out cheating interference using the method for this patent, SAR is received
Echo-signal among be mixed with the bit sequence of amplification.And whether be mixed with cheating interference be for SAR it is unknown, it
Still it can be handled, be passed through according to old process as conventional range pulse compression, range curvature correction, Azimuth Compression
After this series of processes, it just will appear false target in SAR imaging results.(deception jammer and SAR are separate from
Two systems, this patent pertain only to the former, and the imaging of the latter has a set of conventional and complicated process, will not influence this specially
The effect of sharp method).
A concrete application embodiment of the invention can further illustrate by emulation experiment below, and when emulation uses
MATLAB software is emulated.
The parameter for emulating data is as follows, and: Fig. 3 show the real goal imaging results there are cheating interference, one in scene
The road of bifurcated, Fig. 4 show the image of the cheating interference of addition, and shape is identical as the road of bifurcated, and it is dry that Fig. 5 show deception
The road of imaging results after disturbing, bifurcated is covered by false target, cannot be found.Therefore preferable cheating interference knot is achieved
Fruit.
The function of the preferred embodiment for the SAR cheating interference generation system based on a bit sample that the present invention provides a kind of
Functional block diagram, as shown in Figure 6, wherein system includes:
Bit sequential sampling generation module 100 obtains the signal of SAR transmitting for deception jammer, and SAR is emitted
The numerical value of signal is compared with predetermined threshold, and different sampled values, which is respectively adopted, according to different comparison results indicates, according to
One bit sequential sampling of sampled value generation SAR signal；Specifically as described in embodiment of the method.
Data quantization module 200, the scattering coefficient of several False Intersection Points for obtaining the confidential generation of cheating interference, according to
The corresponding instantaneous oblique distance of scattering coefficient acquisition is poor, and it is single that several moment oblique distance residual quantity are turned to several discrete instantaneous oblique distances differences
Member obtains the data of one-dimensional range profile according to instantaneous oblique distance difference unit；Specifically as described in embodiment of the method.
Convolution module 300 obtains convolution algorithm for a bit sequential sampling and one-dimensional range profile to be carried out convolution algorithm
Cheating interference vector afterwards；Specifically as described in embodiment of the method.
Comparison module 400, for the point-by-point of cheating interference vector to be compared with the noise threshold generated in advance, according to
Comparison result generates a bit sequence；Specifically as described in embodiment of the method.
Amplification forwarding module 500 is forwarded for amplifying a bit sequence, and to the disturbed SAR of needs；
Specifically as described in embodiment of the method.
Cheating interference target generation module 600 forwards a bit sequence for repeating in different pulse recurrence intervals
Column generate the cheating interference target focused in SAR；Specifically as described in embodiment of the method.
The SAR cheating interference generation system based on a bit sample, wherein the bit sequential sampling generates mould
Block specifically includes:
First comparing unit, for deception jammer obtain SAR transmitting signal, and by SAR transmitting signal numerical value
It is compared with 0；Specifically as described in embodiment of the method.
Sequence generates and recording unit, and the sampled value in the numerical value of the signal for emitting SAR greater than 0 is expressed as 1, small
Sampled value in 0 is expressed as 0, the one bit sequential sampling s of SAR signal obtained according to sampled value, believes before recording a bit sample
Number range parameter A；Specifically as described in embodiment of the method.
The SAR cheating interference generation system based on a bit sample, wherein the data quantization module is specifically wrapped
It includes:
Quantifying unit, the scattering coefficient of several False Intersection Points for obtaining the confidential generation of cheating interference
δk, δkCorresponding instantaneous oblique distance difference is denoted as Δ Rk, the corresponding maximum oblique distance difference of False Intersection Points and minimum oblique distance difference are respectively Δ
RmaxWith Δ Rmin.In Δ RmaxWith Δ RminBetween uniform quantization be the discrete instantaneous oblique distance difference units of U,
ΔR0=[Δ Rmin ΔRmin+ΔRstep … ΔRmin+(u-1)ΔRstep … ΔRmax]T
Wherein Δ RstepFor quantized interval, u=1,2 ..., U, wherein Δ Rstep=ρr/ 8, wherein ρrFor the distance point of SAR
Distinguish unit；Specifically as described in embodiment of the method.
One-dimensional range profile data capture unit, for that will have the false scattering point target of identical instantaneous oblique distance difference to be classified as together
One set, it is assumed that N number of False Intersection Points are shared in u-th of unit, then the numerical value of u-th of unit of one-dimensional range profile σ is
Wherein, taAt the time of correspondence for current PRF, δnFor scattering coefficient；Specifically as described in embodiment of the method.
The SAR cheating interference generation system based on a bit sample, wherein the convolution module specifically includes:
Vector roll-over unit, for overturning the element position of one-dimensional range profile vector σ, it is assumed that sequence originally is
1,2,3 ..., U, then overturn after sequence be U, U-1, U-2 ..., 1, be expressed as σ '；Specifically as described in embodiment of the method.
Translation unit, for a bit signal s to be translated point by point, make the point of its rear end and one-dimensional picture after overturning to
Amount σ ' is gradually overlapped, until signal s translates out the range of σ ' completely, then needs to carry out M+U-1 translation altogether；Specific such as method is real
It applies described in example.
First arithmetic element, for carrying out the q times after translating (1≤q≤M+U-1), by the number of two vector laps
According to being multiplied point by point, multiplication operations carry out XOR operation by a bit sample signal s and the one-dimensional highest order as vector σ ',
The data bit of one-dimensional range profile vector σ is retained；Specifically as described in embodiment of the method.
Second operation and recording unit, after being used to be multiplied to lap point by point, by the calculating of all overlapping dot-products
As a result summation operation, resulting result storage to a new data vector s are carried outJQ-th of position, translation M+U-1 it
Afterwards, the cheating interference s obtainedJIt is the vector of one (M+U-1) × 1 dimension, by sJThe maximum value of vector magnitude is denoted as AJ；Specifically such as
Described in embodiment of the method.
In conclusion the invention proposes a kind of SAR cheating interference production method and system based on a bit sample, side
Method includes: to obtain the signal that SAR emits to be compared with predetermined threshold, generates a bit sequential sampling according to comparison result；It obtains
It takes the instantaneous oblique distance of the scattering coefficient of several to be generated False Intersection Points poor, is quantified as discrete instantaneous oblique distance difference unit, according to
Instantaneous oblique distance difference unit obtains one-dimensional range profile；One bit sequential sampling and one-dimensional range profile are subjected to convolution algorithm and generate deception
Interfere vector；A bit sequence is generated according to the point-by-point of cheating interference vector and the comparison result of the noise threshold generated in advance；
One bit sequence is amplified, and is forwarded to the disturbed SAR of needs；In different pulse recurrence intervals, repeat
Above-mentioned steps generate the cheating interference target of focusing.The present invention greatly reduces the calculation amount and fortune of cheating interference Convolution Modulation
Complexity is calculated, reduces the cost of SAR deception jammer, cheating interference effect is good.
It should be understood that the application of the present invention is not limited to the above for those of ordinary skills can
With improvement or transformation based on the above description, all these modifications and variations all should belong to the guarantor of appended claims of the present invention
Protect range.
Claims (10)
1. a kind of SAR cheating interference production method based on a bit sample, which is characterized in that method comprising steps of
A, deception jammer obtains the signal of SAR transmitting, and the numerical value of the signal of SAR transmitting is compared with predetermined threshold,
Different sampled values, which is respectively adopted, according to different comparison results indicates, a bit sample of SAR signal is generated according to sampled value
Sequence；
B, the scattering coefficient for obtaining several False Intersection Points of the confidential generation of cheating interference obtains corresponding instantaneous oblique according to scattering coefficient
Away from difference, several moment oblique distance residual quantity are turned into several discrete instantaneous oblique distance difference units, are obtained according to instantaneous oblique distance difference unit
Take the data of one-dimensional range profile；
C, a bit sequential sampling and one-dimensional range profile are subjected to convolution algorithm, the cheating interference vector after obtaining convolution algorithm；
D, the point-by-point of cheating interference vector is compared with the noise threshold generated in advance, a bit is generated according to comparison result
Sequence；
E, a bit sequence is amplified, and is forwarded to the disturbed SAR of needs；
F, in different pulse recurrence intervals, step A~step E is repeated, generates the cheating interference target focused in SAR.
2. the SAR cheating interference production method according to claim 1 based on a bit sample, which is characterized in that described
Step A specifically includes step:
A1, deception jammer obtain the signal of SAR transmitting, and the numerical value of the signal of SAR transmitting is compared with 0；
A2, the sampled value in the numerical value of the signal of SAR transmitting greater than 0 being expressed as 1, the sampled value less than 0 is expressed as 0, according to
The one bit sequential sampling s of SAR signal that sampled value obtains records the range parameter A of a bit sample front signal.
3. the SAR cheating interference production method according to claim 2 based on a bit sample, which is characterized in that described
Step B specifically includes step:
B1, obtain the confidential generation of cheating interference several False Intersection Points scattering coefficient δk, δkCorresponding instantaneous oblique distance difference is denoted as Δ
Rk, the corresponding maximum oblique distance difference of False Intersection Points and minimum oblique distance difference are respectively Δ RmaxWith Δ Rmin；In Δ RmaxWith Δ RminBetween
It is even to be quantified as U discrete instantaneous oblique distance difference units,
ΔR0=[Δ Rmin ΔRmin+ΔRstep … ΔRmin+(u-1)ΔRstep … ΔRmax]T
Wherein Δ RstepFor quantized interval, u=1,2 ..., U, wherein Δ Rstep=ρr/ 8, wherein ρrFor the Range resolution list of SAR
Member；
B2, the false scattering point target with identical instantaneous oblique distance difference is classified as the same set, it is assumed that share in u-th of unit
N number of False Intersection Points, then the numerical value of u-th of unit of one-dimensional range profile σ be
Wherein, taAt the time of correspondence for current PRF, δnFor scattering coefficient.
4. the SAR cheating interference production method according to claim 3 based on a bit sample, which is characterized in that described
Step C specifically includes step:
C1, the element position of one-dimensional range profile vector σ is overturn, it is assumed that sequence originally is 1,2,3 ..., and U is then overturn
Sequence afterwards be U, U-1, U-2 ..., 1, be expressed as σ '；
C2, a bit signal s is translated point by point, make the point of its rear end with it is one-dimensional as vector σ ' is gradually overlapped after overturning,
Until signal s translates out the range of σ ' completely, then need to carry out M+U-1 translation altogether；
C3, it carries out the q times after translating, the data of two vector laps are multiplied by 1≤q≤M+U-1 point by point, are multiplied
Operation carries out XOR operation by a bit sample signal s and the one-dimensional highest order as vector σ ', to one-dimensional range profile vector σ's
Data bit is retained；
C4, after being multiplied point by point to lap, the calculated result of all overlapping dot-products is subjected to summation operation, resulting knot
Fruit stores to a new data vector sJQ-th of position, after translating M+U-1, obtained cheating interference sJIt is (a M
+ U-1) × 1 vector tieed up, by sJThe maximum value of vector magnitude is denoted as AJ。
5. the SAR cheating interference production method according to claim 4 based on a bit sample, which is characterized in that described
Step D specifically includes step:
D1, the mean value of generation Gaussian distributed is 0, variance is in advanceRandom noise, the probability density of random noise is
The definition of Signal to Noise Ratio (SNR) is
D2, using the random noise generated in advance as the cheating interference s of noise threshold and generationJPoint-by-point comparison is carried out, when deception is dry
When disturbing greater than the threshold value, then in a bit sequence sJ1Corresponding position be denoted as 1, -1 is then denoted as when less than the threshold value, to generate
One bit sequence sJ1。
6. the SAR cheating interference production method according to claim 5 based on a bit sample, which is characterized in that described
Step E specifically includes step:
E1, by a bit sequence sJ1It amplifies, amplified cheating interference is α sJ1, wherein α is amplification coefficient, can be by following formula
It is calculated
Wherein the value of β is inquired pre-set relation table according to different signal-to-noise ratio and is selected；
E2, by amplified cheating interference α sJ1The SAR disturbed to needs is forwarded.
7. a kind of SAR cheating interference generation system based on a bit sample, which is characterized in that system includes:
Bit sequential sampling generation module, obtains the signal of SAR transmitting for deception jammer, and by the signal of SAR transmitting
Numerical value is compared with predetermined threshold, and different sampled values, which is respectively adopted, according to different comparison results indicates, according to sampled value
Generate a bit sequential sampling of SAR signal；
Data quantization module, the scattering coefficient of several False Intersection Points for obtaining the confidential generation of cheating interference are according to scattering
The corresponding instantaneous oblique distance of number acquisition is poor, several moment oblique distance residual quantity are turned to several discrete instantaneous oblique distance difference units, according to
Instantaneous oblique distance difference unit obtains the data of one-dimensional range profile；
Convolution module, for a bit sequential sampling and one-dimensional range profile to be carried out convolution algorithm, taking advantage of after obtaining convolution algorithm
Deceive interference vector；
Comparison module is tied for being compared the point-by-point of cheating interference vector with the noise threshold generated in advance according to comparing
Fruit generates a bit sequence；
Amplification forwarding module is forwarded for amplifying a bit sequence, and to the disturbed SAR of needs；
Cheating interference target generation module forwards a bit sequence for repeating in different pulse recurrence intervals, generates
The cheating interference target focused in SAR.
8. the SAR cheating interference generation system according to claim 7 based on a bit sample, which is characterized in that described
Bit sequential sampling generation module specifically includes:
First comparing unit, for deception jammer obtain SAR transmitting signal, and by SAR transmitting signal numerical value and 0 into
Row compares；
Sequence generates and recording unit, and the sampled value in the numerical value of the signal for emitting SAR greater than 0 is expressed as 1, less than 0
Sampled value be expressed as 0, the one bit sequential sampling s of SAR signal that is obtained according to sampled value, one bit sample front signal of record
Range parameter A.
9. the SAR cheating interference generation system according to claim 8 based on a bit sample, which is characterized in that described
Data quantization module specifically includes:
Quantifying unit, the scattering coefficient δ of several False Intersection Points for obtaining the confidential generation of cheating interferencek, δkCorresponding instantaneous oblique distance
Difference is denoted as Δ Rk, the corresponding maximum oblique distance difference of False Intersection Points and minimum oblique distance difference are respectively Δ RmaxWith Δ Rmin；In Δ RmaxAnd Δ
RminBetween uniform quantization be the discrete instantaneous oblique distance difference units of U,
ΔR0=[Δ Rmin ΔRmin+ΔRstep … ΔRmin+(u-1)ΔRstep … ΔRmax]T
Wherein Δ RstepFor quantized interval, u=1,2 ..., U, wherein Δ Rstep=ρr/ 8, wherein ρrFor the Range resolution list of SAR
Member；
One-dimensional range profile data capture unit, it is same for that will have the false scattering point target of identical instantaneous oblique distance difference to be classified as
Set, it is assumed that N number of False Intersection Points are shared in u-th of unit, then the numerical value of u-th of unit of one-dimensional range profile σ is
Wherein, taAt the time of correspondence for current PRF, δnFor scattering coefficient.
10. the SAR cheating interference generation system according to claim 9 based on a bit sample, which is characterized in that described
Convolution module specifically includes:
Vector roll-over unit, for overturning the element position of one-dimensional range profile vector σ, it is assumed that sequence originally is 1,2,
3 ..., U, then overturn after sequence be U, U-1, U-2 ..., 1, be expressed as σ '；
Translation unit makes the point of its rear end and the one-dimensional picture vector σ ' after overturning for being translated a bit signal s point by point
It is gradually overlapped, until signal s translates out the range of σ ' completely, then needs to carry out M+U-1 translation altogether；
First arithmetic element, after carrying out the q times translation, 1≤q≤M+U-1 carries out the data of two vector laps
Point-by-point to be multiplied, multiplication operations carry out XOR operation by a bit sample signal s and the one-dimensional highest order as vector σ ', to one-dimensional
The data bit of Range Profile vector σ is retained；
Second operation and recording unit, after being used to be multiplied to lap point by point, by the calculated results of all overlapping dot-products
Carry out summation operation, resulting result storage to a new data vector sJQ-th of position obtained after translating M+U-1
The cheating interference s arrivedJIt is the vector of one (M+U-1) × 1 dimension, by sJThe maximum value of vector magnitude is denoted as AJ。
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| CN111896952B (en) * | 2020-06-17 | 2022-05-10 | 深圳大学 | Multi-target deception jamming method and device based on 1-bit quantization |
| CN111814608B (en) * | 2020-06-24 | 2023-10-24 | 长沙一扬电子科技有限公司 | SAR target classification method based on fast full convolution neural network |
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| CN112255596B (en) * | 2020-11-09 | 2023-09-15 | 中国人民解放军战略支援部队航天工程大学 | Space-borne SAR deception jamming signal generation method based on spatial frequency interpolation |
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