CN106569185B - A kind of improvement SMSP interference method of linear frequency modulated(FM) radar - Google Patents
A kind of improvement SMSP interference method of linear frequency modulated(FM) radar Download PDFInfo
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- 230000006798 recombination Effects 0.000 claims description 2
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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 improvement SMSP interference methods of linear frequency modulated(FM) radar, belong to Radar ECM field.The present invention includes: that jammer receives radar signal, is converted into intermediate-freuqncy signal by frequency mixer down coversion；It will turn radar intermediate frequency signal by being sent into A/D converter after low-pass filter, it will be sampled with high-frequency clock；Radar pulse signal is grouped, is replicated, is spliced into a complete radar generated pulse train, processing is modulated to new complete radar generated pulse train；Pulse after modulation treatment is subjected to D/A conversion, is re-fed into low-pass filter；Pulse interference signal after low-pass filtering is upconverted to the center carrier frequencies of radar by frequency mixer, and is launched.The present invention is using subpulse string circulation forwarding working method, since subpulse string signal and radar signal contain identical chirp rate, and match with the matched filter of radar signal, therefore false target can be generated in radar receiving end, to achieve the effect that deception.
Description
Technical field
The present invention relates to a kind of improvement SMSP interference methods of linear frequency modulated(FM) radar, belong to Radar ECM neck
Domain.
Background technique
Target is detected using radar and a kind of important means that strike is modern military is carried out to target.Radar is a kind of
Electronic system, the purpose is to detect target and measure distance, angle and the speed of target.Radar needs to emit radio frequency by antenna
Pulse signal, calculated by the time between the target echo that measures transmitted pulse and detected by radar receiver away from
From.As Radar Technology is with the fast development of Radar Technology, to the operating distance, resolution capability and measurement accuracy etc. of radar
Requirement it is also higher and higher.It is understood that the resolution by radar signal is theoretical, is guaranteeing certain signal-to-noise ratio and realizing optimization process
Under the premise of, the requirement of measurement accuracy and resolving power to signal form is completely the same: range accuracy and range resolution mainly take
Certainly in the frequency structure of signal, he requires signal to have big bandwidth；Rate accuracy and speed resoluting force depend on signal when
Between structure, he require signal have big time width.Therefore, ideal radar signal should have big time width bandwidth product.When big
Width ensure that speed resoluting force, and big bandwidth then ensure that range resolution.But big time width and big bandwidth can not often get both.?
That is there is implacable contradictions between range accuracy and range resolution and rate accuracy and speed resoluting force.
In order to solve this to contradiction, it is necessary to using the sophisticated signal form with big time width bandwidth product.Due to linearly adjusting
Frequency signal has characteristic outstanding, then chirp and its matching treatment --- and pulse compression is contemplated first,
His wide range of applications, the application especially in radar system are very universal.
This signal is that signal is extended under the premise of big time width to reach in the included load wave linear frequency modulation of broad pulse
Bandwidth.In order to obtain high resolution range ability corresponding to chirped big bandwidth, its Doppler to echo-signal is utilized
Insensitive feature is translated, the signal with different Doppler shifts can be handled with a matched filter, this will significantly
Simplify signal processing system, and since linear FM signal is easy to produce and is handled, so that chirp pulse signal is current
Radar engineering is using a kind of upper pulse compression signal widest, technology is most mature.
The interference method of linear FM pulse compression radar just becomes the research hotspot in Radar EW field.At present
Mainly use digital radiofrequency memory (DRFM) Lai Shixian.Interference system based on DRFM intercepts radar signal, downconverted
After be acquired, store, in due course it is machine-readable go out, be converted into analog signal through D/A and up-convert to radiofrequency signal again, in certain item
Under part, the interference signal of DRFM reconstruct is the accurate duplication of radar signal, therefore can generate to chirp-pulse compression radar
Effective false target deceptive jamming.
DRFM repeating jamming generally uses two kinds of common working methods: overall pulse storage forwarding and short pulse storage follow
Ring forwarding.Overall pulse store-and-forward mode can produce a decoy very true to nature, but decoy at least lags behind true target
One pulse width, this is totally unfavorable for the interference of big time width radar；Short pulse storage circulation retransmitted jamming solves
The problem of decoy time lag, by the novel decoy and multi-false targets that carry out complicated intra-pulse modulation to the short pulse of storage
Interference have suppress and deception double grading, into radar receiver after multiple decoys are generated in distance and speed, will be true
Real target is submerged in decoy group.
SMSP interference is new-type distance false mesh of the Sparrow et al. in the special confrontation pulse compression radar of invention in 2006
One of mark interference.Such interference is formation to be received, modulated and forwarded to radar signal, it is by more based on DRFM platform
A subpulse composition, wherein each subpulse is that interval sampling generation is carried out to the radar signal received, therefore it can be
Radar receiving end generates a large amount of false targets, to make radar that can not correctly detect the parameter information of real goal, influences true
The detection of target.
The SMSP interference that Sparrow et al. is proposed is a kind of reconstruct interference, and the thunder received is received and stored using DRFM
It is sampled up to signal and in the time domain；Then clock frequency is increased to original n times, to sampled data carry out extract and by
Former sequence is ranked up, and then to the signal replication n times after sequence, obtains the jamming signal type of signal, as SMSP interference.It is this
Interfering its instantaneous frequency is segmented, and chirp rate is different from the chirp rate of radar signal.When receive signal in containing only
When SMSP interferes or contain interference and very high jamming-to-signal ratio, extracting and receiving the instantaneous frequency of signal is to propose the instantaneous frequency of interference
Rate, this feature are easy to carry out interference type identification as feature by radar and detect to interference composition.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of improvement SMSP interference method of linear frequency modulated(FM) radar,
On the basis of receiving and storing the radar signal received using DRFM and being sampled in the time domain to it, sampled data is carried out not
Rule extraction recycles forwarding working method using short pulse, by being modulated to the subpulse of storage, forms intermittent sampling weight
The jamming signal type forwarded again, the jamming signal type can make radar generate large number of, the stronger decoy true to nature of amplitude, and can be with
By the way that interference parameter is arranged, decoy number, amplitude and the relative position before and after true target can be adjusted, be realized to decoy
The regulation of pattern generates the interference effect of multiplicity so as to search, detection, the tracking to radar.
The present invention uses following technical scheme to solve above-mentioned technical problem:
The present invention provides a kind of improvement SMSP interference method of linear frequency modulated(FM) radar, is recycled and is forwarded using subpulse string
Working method is generated in radar receiving end apart from upper false target, the specific steps are as follows:
Step 1, jammer receives radar signal, then the radar signal received is converted into thunder by frequency mixer down coversion
Up to intermediate-freuqncy signal；
Step 2, by radar intermediate frequency signal by being sent into A/D converter after low-pass filter, with high-frequency clock to its into
Row sampling obtains radar pulse signal；
Step 3, after carrying out splitting and reorganizing to radar pulse signal, processing is modulated to the subpulse after recombination and obtains arteries and veins
Interference signal is rushed, specifically includes the following steps:
Radar pulse signal is divided into M group, there is N number of subpulse in each group by step 3-1；
Then step 3-2 randomly selects M from each group respectivelyiA subpulse, andWherein, MiIt is
The number for the subpulse chosen in i group；
The subpulse chosen in M group is formed the subpulse string that a length is N by step 3-3 in order；Again by the sub- arteries and veins
After punching string duplication M-1 times, make the M sub- train of pulse splicing one new radar generated pulse train of composition；
Step 3-4 is modulated processing to new radar generated pulse train, obtains pulse interference signal, wherein at specific modulation
The rule of reason are as follows: in addition to the subpulse on the top n position of new radar generated pulse train remains unchanged, the subpulse of remaining position is equal
With the son in the subpulse of the position in new radar generated pulse train and step 2 on the adjacent position of radar pulse signal in the position
The half of the difference of pulse is replaced after being added；
Step 4, after pulse interference signal being carried out D/A conversion, it is re-fed into low-pass filter；
Step 5, the pulse interference signal after low-pass filtering is upconverted to the center carrier frequencies of radar by frequency mixer,
And launch.
As a further optimization solution of the present invention, digital RF is carried out to radar pulse signal using DRFM in step 2
Storage.
As a further optimization solution of the present invention, pass through center frequency of the frequency mixer down coversion by radar signal in step 1
Rate is transformed into a certain intermediate frequency or zero-frequency, and the radar signal received is converted into intermediate-freuqncy signal.
As a further optimization solution of the present invention, M is even number.
As a further optimization solution of the present invention, N is even number.
The invention adopts the above technical scheme compared with prior art, has following technical effect that the present invention is utilizing
On the basis of DRFM receives and stores the radar signal received and samples in the time domain to it, sampled data is irregularly taken out
It takes, forwarding working method is recycled using short pulse, by being modulated to the subpulse of storage, form intermittent sampling and repeat to forward
Jamming signal type, the jamming signal type can make radar generate large number of, the stronger decoy true to nature of amplitude, followed using subpulse string
Ring forwards working method, since subpulse string signal and radar signal contain identical chirp rate, and with radar signal
Match with filter, therefore false target can be generated in radar receiving end, to achieve the effect that deception.
Detailed description of the invention
Fig. 1 is that interference of the invention generates flow chart.
Fig. 2 is the packet fragmentation schematic diagram of radar pulse signal after high-speed sampling.
Fig. 3 is the subpulse schematic diagram extracted in every group.
Fig. 4 is to merge the subpulse string extracted in every group to piece together the schematic diagram for being put into first group.
Fig. 5 is that the subpulse string in first group is replicated M-1 times to and merged the complete radar generated pulse train schematic diagram of composition.
Fig. 6 is the time domain waveform of improvement SMSP interference proposed by the present invention.
Fig. 7 is the effect picture of improvement SMSP interference proposed by the present invention.
Specific embodiment
Technical solution of the present invention is described in further detail with reference to the accompanying drawing:
The present invention provides a kind of improvement SMSP interference method of linear frequency modulated(FM) radar, is recycled and is forwarded using subpulse string
Working method is generated apart from upper false target, as shown in Figure 1 in radar receiving end, the specific steps are as follows:
Step 1, jammer receives radar signal, then is transformed into the centre frequency of radar signal by frequency mixer down coversion
The radar signal received is converted into radar intermediate frequency signal by a certain intermediate frequency or zero-frequency.
Step 2, by radar intermediate frequency signal by being sent into A/D converter after low-pass filter, with high-frequency clock to its into
Row sampling obtains radar pulse signal.
Step 3 is grouped radar pulse signal, then several subpulses are chosen out of each group, then selects these
The subpulse taken out forms subpulse string in order, and the new subpulse string duplication of composition is then spliced into a complete thunder
Up to train of pulse, processing finally is modulated to new complete radar generated pulse train, specifically includes the following steps:
Step 3-1, the radar pulse signal after high-speed sampling, which is divided into M group, (has N number of subpulse, here M, N in each group
It is even number), as shown in Figure 2.Then respectively from the random taking-up M in each groupiA subpulse, so that the son that M group is taken out
The sum of umber of pulse is equal to N, i.e.,(M hereiIt is the number of the subpulse taken out in i-th group, keeps this M out in mindiIt is a
Position of the subpulse in i-th group is nj(j=1,2 ..., Mi), as shown in Figure 3.
The subpulse taken out in M group is formed the subpulse string that length is N, as shown in Figure 4 by step 3-2 in order.
Step 3-3 after the subpulse string for newly forming 3-2 replicates M-1 times, is allowed to splicing one complete radar arteries and veins of composition
Punching string, as shown in Figure 5.
Step 3-4 is modulated processing to new radar generated pulse train, obtains pulse interference signal, wherein at specific modulation
The rule of reason are as follows: in addition to the subpulse on the top n position of new radar generated pulse train remains unchanged, the subpulse of remaining position is equal
With the son in the subpulse of the position in new radar generated pulse train and step 2 on the adjacent position of radar pulse signal in the position
The half of the difference of pulse is replaced after being added, the new train of pulse after obtaining modulation treatment, as pulse interference signal.
Step 4, after pulse interference signal being carried out D/A conversion, it is re-fed into low-pass filter.
Step 5, the pulse interference signal after low-pass filtering is upconverted to the center carrier frequencies of radar by frequency mixer,
And launch.
Technical solution of the present invention is further elaborated below by specific embodiment:
The actual measurement radar data received is handled, radar pulse data are carried out according to (M=4, N=8) respectively
Grouping, then process in accordance with the present invention 3, first take out two subpulses in each group at random, then take out extraction
Subpulse forms the subpulse string that a length is 8, then again replicates the subpulse string that the length newly formed is 83 times, is placed in
After the subpulse string, it is allowed to be spliced into the complete pulse string that a length is 32.Finally to the complete pulse string newly formed into
Row modulation treatment；The rule of modulation treatment is other than the subpulse that first length of train of pulse is 8 remains unchanged, other positions
Subpulse and original pulse adjacent position subpulse in the position of the subpulse with new splicing pulse in the position difference
Half be added, the new train of pulse after obtaining modulation treatment, as pulse interference signal.
Fig. 6 is M=4, when N=8 the time domain waveform proposed by the present invention for improving SMSP interference.Fig. 7 is M=4, when N=8
The effect picture proposed by the present invention for improving SMSP interference.As can be seen from Figures 6 and 7, method proposed by the present invention can form void
Decoy has deception effect.Meanwhile by adjusting the spacing parameter N between packet parameters M and subpulse, this can be made
What invention proposed recycles the interference that forwarding working method generates using subpulse string has deception and compacting interference effect simultaneously.
The above, the only specific embodiment in the present invention, but scope of protection of the present invention is not limited thereto, appoints
What is familiar with the people of the technology within the technical scope disclosed by the invention, it will be appreciated that expects transforms or replaces, and should all cover
Within scope of the invention, therefore, the scope of protection of the invention shall be subject to the scope of protection specified in the patent claim.
Claims (5)
1. a kind of improvement SMSP interference method of linear frequency modulated(FM) radar, which is characterized in that specific step is as follows:
Step 1, jammer receives radar signal, then the radar signal received is converted into radar by frequency mixer down coversion
Frequency signal；
Step 2, radar intermediate frequency signal adopts it with high-frequency clock by being sent into A/D converter after low-pass filter
Sample obtains radar pulse signal；
Step 3, after carrying out splitting and reorganizing to radar pulse signal, being modulated processing to the subpulse after recombination, to obtain pulse dry
Signal is disturbed, specifically includes the following steps:
Radar pulse signal is divided into M group, there is N number of subpulse in each group by step 3-1；
Then step 3-2 randomly selects M from each group respectivelyiA subpulse, andWherein, MiIt is i-th group
In the number of subpulse chosen；
The subpulse chosen in M group is formed the subpulse string that a length is N by step 3-3 in order；Again by the subpulse string
After duplication M-1 times, make the M sub- train of pulse splicing one new radar generated pulse train of composition；
Step 3-4 is modulated processing to new radar generated pulse train, obtains pulse interference signal, wherein specific modulation treatment
Rule are as follows: in addition to the subpulse on the top n position of new radar generated pulse train remains unchanged, the subpulse of remaining position is used newly
Radar generated pulse train in the position subpulse and step 2 in subpulse on the adjacent position of radar pulse signal in the position
Difference half be added after replace；
Step 4, after pulse interference signal being carried out D/A conversion, it is re-fed into low-pass filter；
Step 5, the pulse interference signal after low-pass filtering is upconverted to the center carrier frequencies of radar by frequency mixer, concurrently
It is shot out.
2. a kind of improvement SMSP interference method of linear frequency modulated(FM) radar according to claim 1, which is characterized in that step
Digital RF storage is carried out to radar pulse signal using DRFM in rapid 2.
3. a kind of improvement SMSP interference method of linear frequency modulated(FM) radar according to claim 1, which is characterized in that step
The centre frequency of radar signal is transformed by a certain intermediate frequency or zero-frequency by frequency mixer down coversion in rapid 1, the radar that will be received
Signal is converted into intermediate-freuqncy signal.
4. a kind of improvement SMSP interference method of linear frequency modulated(FM) radar according to claim 1, which is characterized in that M
For even number.
5. a kind of improvement SMSP interference method of linear frequency modulated(FM) radar according to claim 1, which is characterized in that N
For even number.
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| CN110824441B (en) * | 2019-10-31 | 2023-11-21 | 上海交通大学 | Deception jamming system and method based on time modulation technology |
| CN112666529B (en) * | 2020-12-04 | 2022-05-03 | 南京工程学院 | Adaptive interference method for linear frequency modulation pulse compression radar |
| CN112881984B (en) * | 2021-01-14 | 2023-09-12 | 中山大学 | Radar signal anti-interference processing method, device and storage medium |
| CN113109769B (en) * | 2021-02-25 | 2024-02-13 | 中国人民解放军空军预警学院 | Random recombination frequency modulation coding anti-interference signal generation method |
| CN114660549A (en) * | 2021-10-29 | 2022-06-24 | 南京长峰航天电子科技有限公司 | Method, system and device for improving antenna isolation |
| CN115629360B (en) * | 2022-12-21 | 2023-03-28 | 西安电子科技大学 | Linear frequency modulation short pulse sampling modulation forwarding interference signal generation method |
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