CN104267379B - A kind of active radar and passive radar based on Waveform Design works in coordination with anti-interference method - Google Patents
A kind of active radar and passive radar based on Waveform Design works in coordination with anti-interference method Download PDFInfo
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- CN104267379B CN104267379B CN201410468299.3A CN201410468299A CN104267379B CN 104267379 B CN104267379 B CN 104267379B CN 201410468299 A CN201410468299 A CN 201410468299A CN 104267379 B CN104267379 B CN 104267379B
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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
- G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures
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Abstract
A kind of active radar and passive radar based on Waveform Design of this invention works in coordination with anti-interference method, belongs to Anti-jamming Technology for Radar field, and it is particularly to technology of radar waveform design.This invention uses active radar and passive radar cooperative work mode, utilize the echo information of passive radar detecting real-time, interference is detected and identifies, and estimate the relevant parameter of interference, Active Radar utilizes the interference information that passive radar provides, the transmitted waveform that design is optimum, and echo information is processed, thus there is the effect of the capacity of resisting disturbance that amount of calculation is little, real-time is high, improve radar under complicated electromagnetic interference environment.
Description
Technical field
The invention belongs to Anti-jamming Technology for Radar field, it is particularly to technology of radar waveform design.
Background technology
Modern radar is operated in the electromagnetic interference environment of complexity, it is necessary to possessing effective capacity of resisting disturbance could survive afield.
Along with the development of gate stealing, it is based particularly on the appearance of the active deception jamming technology of digital radiofrequency memory (DRFM),
The accuracy of radar target acquisition and the stability of target following are brought and greatly challenged, and Anti-jamming Technology for Radar is faced with more to be come
The biggest difficulty.Radar active cheating interference pattern is various, and can obtain bigger interference effect with relatively low jamming-to-signal ratio gain, makes
Radar is difficult to be correctly detected and follow the tracks of real goal, the serious detection reducing radar and tracking performance.
Conventional radar is owing to using fixed transmission waveform, and the most disturbed machine is intercepted and captured and replicated, therefore is highly susceptible to interference, and impact is true
The detection of real target.Waveform Design is one of effective measures of Radar cross-section redaction, in recent years, has scholar to utilize Active Radar convertible
The advantage of transmitted waveform, by waveform design method to anti-deceptive interference.But these are studied and are both for list portion radar, and list portion
Radar horizon is less, and the real-time of the acquisition interference of list portion radar and target component is poor, therefore at fast-changing complicated electromagnetism
Capacity of resisting disturbance in interference environment is limited.The active radar and passive radar net suppression deception formula that Li Shizhong etc. propose the configuration of a kind of strange land is false
The method of target jamming, the method obtains the measurement information of target range, azimuth and the angle of pitch according to Active Radar, and passively
Radar obtains azimuth of target and the measurement information of the angle of pitch, is differentiated by a mark correlating method and is rejected false target jamming profile, can improve
Active radar and passive radar detection tracking performance under false target jamming profile, is shown in that [Li Shizhong, kingdom is grand, Xu sea congruence.The master of strange land configuration/
The anti-multi-false-target jamming of passive radar.Firepower controls with commander, and 2013,38 (5): 10-13].But the method is at data analysis layer
In the face of interference processes, add the resource consumption of radar, and higher to the mistake mirror probability of decoy.
Summary of the invention
The defect existed for background technology, the present invention uses active radar and passive radar cooperative work mode, utilizes passive radar detecting real-time
Echo information, interference is detected and identifies, and estimate interference relevant parameter, Active Radar utilizes passive radar to provide
Interference information, the transmitted waveform that design is optimum, and echo information is processed, thus reach that amount of calculation is little, real-time is high, carry
High radar capacity of resisting disturbance under complicated electromagnetic interference environment.
The invention provides a kind of active radar and passive radar based on Waveform Design and work in coordination with anti-interference method, it comprises the following steps:
Step 1, passive radar Interference Detection
Active radar and passive radar works simultaneously, and Active Radar is constantly to emission pulse signal, and active radar and passive radar the most constantly receives radar and returns
Echo-signal is also processed by ripple signal, and passive radar carries out detecting real-time to specific region, is receiving the thunder of target reflection
After reaching echo, use dualism hypothesis etection theory that interference is detected:
Wherein, x (t) represents that passive radar receives signal, and n (t) represents additive white Gaussian noise, and s (t) is real goal echo-signal, J (t)
The interference signal generated after intercepting and capturing radar signal for jammer；H0、H1Represent that interference signal J (t) does not exists and has two kinds respectively
Hypothesis testing result；
Under the conditions of CFAR, interference detection results is differentiated by passive radar, if be not detected by interference, Active Radar under
One moment selected to launch general pulse signal；If be detected that there is interference, then interference is identified by jump procedure 2 and parameter is estimated
Meter；
Step 2, passive radar disturbance ecology and parameter estimation
2.1, disturbance ecology
Shape information and the radar return information of active radar and passive radar reception that Active Radar is launched can be expressed as a K through information fusion
Dimension functionWhereinBeing the parameter set relevant with target and interference signal, A is
The amplitude collection that target and interference are constituted, ω is target and disturbs the frequency set constituted,The azimuth set constituted for target and interference,
θ is target and the angle of pitch set of interference composition, fdThe Doppler's collection constituted for target and interference；Signal after merging is carried out spy
Levying extraction, signal carries out polytype nonlinear transformation the most simultaneously, transformed rear signal is all represented by:
Wherein Sq=f (R1,R2,…Rk), k≤K, RkRepresent signal SqKth category feature parameter；Signal characteristic after each conversion is joined
Number uses interference type sorting algorithm based on neutral net to be identified interference, and at least one of which can successfully identify interference class
Type；
2.2, parameter estimation
After interference is identified classification, for interference type, by the multichannel estimation technique or maximum likelihood method, it is carried out accordingly
Parameter estimation, its parameter specifically includes that interference signal and the amplitude of echo signal, Doppler and time delay；
Step 3, the interference type obtained according to passive radar in step 2 and interference parameter, select suitable Waveform Design criterion,
Constructing corresponding cost function, then select the Waveform Design algorithm of optimum to calculate the disaggregation making cost function optimum, utilization is tried to achieve
Optimal solution set construct optimum waveform；
The optimum waveform pulse signal that step 4, Active Radar step of transmitting 3 obtain, receives echo-signal simultaneously, and believes echo
Number carry out matched filtering process and doppler processing, then carry out anti-jamming evaluation, if testing result well, is carried out defeated by Evaluated effect
Going out display, effect is bad then uses data to process interference protection measure rejecting interference, and testing result is carried out output display.
In described step 2.1, the signal after merging is carried out Fourier transformation simultaneously, Fourier Transform of Fractional Order, in short-term Fourier become
Change and mate conversion, then signal after each transformation into itself being carried out feature extraction.
Described step 3 select maximum signal noise ratio principle or stopband interfering energy minimum criteria construct corresponding cost function, then profit
Calculate the optimal solution of this cost function with conjugate gradient algorithms or loop iteration algorithm, reconstruct out optimum waveform.
The advantage that a kind of active radar and passive radar based on Waveform Design of the present invention works in coordination with anti-interference method: 1, increase the power model of radar
Enclose；2, interference and the parameter of target can be estimated in real time, improve radar capacity of resisting disturbance in the fast complex jamming environment become；3、
By launching different waveforms, after normal signal processes, just can suppress interference, alleviate the burden that radar data processes.
Accompanying drawing explanation
Fig. 1 is the Technical Architecture figure of the present invention；
Fig. 2 is the flow chart of Waveform Design.
Fig. 3 is under velocity gate deception disturbs, and uses the fixed waveform of list portion Active Radar transmitting and uses active radar and passive radar
The waveform launched after collaborative Waveform Design, the simulation result comparison diagram of radar return Doppler frequency spectrum.
In Fig. 3, Fig. 3-1 is list portion Active Radar Doppler frequency spectrum after Echo Processing；Fig. 3-2 is active radar and passive radar
Doppler frequency spectrum after Echo Processing.
Detailed description of the invention
Illustrating the detailed description of the invention of the present invention below as a example by velocity gate deception disturbs, its step is as follows:
Step 1 passive radar Interference Detection
Active radar and passive radar works simultaneously, and Active Radar is constantly to emission pulse signal, and active radar and passive radar the most constantly receives radar and returns
Echo-signal is also processed by ripple signal.Passive radar carries out detecting real-time to specific region, is receiving the thunder of target reflection
After reaching echo, use dualism hypothesis etection theory that interference is detected:
Wherein, x (t) represents that passive radar receives signal, and n (t) represents additive white Gaussian noise, and s (t) is real goal echo-signal, J (t)
The interference signal generated after intercepting and capturing radar signal for jammer；H0、H1Represent that interference signal J (t) does not exists and has two kinds respectively
Hypothesis testing result.
Use energy detection algorithm that interference is detected, i.e. the echo-signal received is carried out envelope detection, if at one
CPI detects that echo signal amplitude is unexpected in (the guarantee target amplitude of choosing of pulse number keeps constant in a CPI)
Increase to more than twice, be then judged to interference, otherwise it is assumed that do not interfere with.
Active Radar selects transmitted waveform according to the result of passive radar Interference Detection, if passive radar detects there is not interference,
Then jump procedure 4, Active Radar selects to launch general pulse signal at subsequent time；If be detected that there is interference, then redirect step
Interference is identified and parameter estimation by rapid 2.
Step 2 passive radar disturbance ecology and parameter estimation
2.1, disturbance ecology
Shape information and the radar return information of active radar and passive radar reception that Active Radar is launched can be expressed as one 3 through information fusion
Dimension function Sr=f (A, ω, fd), wherein A, ω, fdBeing the parameter set relevant with target and interference signal, A is target and interference structure
The amplitude collection become, ω is target and the frequency set of interference composition, fdThe Doppler's collection constituted for target and interference.After merging
Signal carries out feature extraction, signal is carried out the most simultaneously Fourier transformation, Fourier Transform of Fractional Order, Short Time Fourier Transform and
Join conversion.After Fourier transformation, transformed to frequency domain, i.e. characteristic function Sq=FT (Sr), wherein, FT () represents Fu
In leaf transformation.For speed is disturbed, owing to jammer quantization digit affects, interference there will be a lot of harmonic component at frequency domain,
And velocity gate deception interference Doppler has significantly difference with other interference Doppler, therefore two parameters of selected harmonic parameter and Doppler are made
It is characterized parameter.Utilize interference type recognizer based on neutral net can identify interference to disturb for velocity gate deception.
2.2, parameter estimation
Identify interference for velocity gate deception disturb after, employing the multichannel estimation technique to target and the parameter such as the amplitude of interference and Doppler
Estimate.Receive signal simultaneously by M passage, each passage connect a matched filtering device, i.e. reception signal successively with
Current transmission pulse, front m (m=1,2 ..., M) individual transmitting pulse make matched filtering process, then carry out doppler processing can be at it
In passage in estimate target and the amplitude of interference and doppler information.
Step 3 Active Radar Waveform Design
After knowing that interference is disturbed for velocity gate deception, select to launch inter-pulsed phase-coded waveform in next coherent processing inteval, its
The phase place of each pulse draws by optimizing design, and specific design is as follows: choose stopband interfering energy minimum criteria as Waveform Design
Optimality Criteria, at each target proximity, one stopband is set；Passive radar is utilized to estimate the parameter of target and the interference obtained in real time,
Such as target and the amplitude of interference, Doppler etc., construct corresponding optimization problem；Loop iteration Algorithm for Solving optimization problem is selected to obtain
To optimum disaggregation, each exomonental initial phase in i.e. next coherent processing inteval.
Step 4 Active Radar transmitted waveform selects
Active Radar possesses the ability launching different wave, and its waveform launched is by the result of passive radar Interference Detection in step 1 certainly
Fixed.If passive radar detects there is not cheating interference, then Active Radar selects to launch general pulse signal, as simple pulse is believed
Number or simple linear frequency modulation on pulse etc.；If passive radar detects the presence of cheating interference, then Active Radar selects to launch through design
Impulse waveform, step 3 i.e. designs the waveform obtained.If additionally, Active Radar is commented through anti-jamming effectiveness in steps of 5
Evaluated effect after estimating is preferable, then Active Radar selects to maintain the impulse waveform launched through design.
Step 5 Active Radar echo signal processing
When passive radar is not detected by interference, Active Radar launches general pulse signal, and Active Radar is carrying out matched filtering process
With after doppler processing, testing result is carried out output display；If passive radar detects interference, then Active Radar is launched through setting
The pulse of meter, and carry out matched filtering and doppler processing to being received back to ripple signal, result is carried out anti-jamming effectiveness simultaneously and comment
Estimating, if effect is preferable, testing result is carried out output display, effect is bad then utilizes some mark association algorithm to reject from data plane
Interference, carries out output display by testing result after process.
Claims (3)
1. active radar and passive radar based on Waveform Design works in coordination with an anti-interference method, and the method includes:
Step 1, passive radar Interference Detection
Active radar and passive radar works simultaneously, and Active Radar is constantly to emission pulse signal, and active radar and passive radar the most constantly receives radar and returns
Echo-signal is also processed by ripple signal, and passive radar carries out detecting real-time to specific region, is receiving the thunder of target reflection
After reaching echo, use dualism hypothesis etection theory that interference is detected:
Wherein, x (t) represents that passive radar receives signal, and n (t) represents additive white Gaussian noise, and s (t) is real goal echo-signal, J (t)
The interference signal generated after intercepting and capturing radar signal for jammer；H0、H1Represent that interference signal J (t) does not exists and has two kinds respectively
Hypothesis testing result；
Under the conditions of CFAR, interference detection results is differentiated by passive radar, if be not detected by interference, Active Radar under
One moment selected to launch general pulse signal；If be detected that there is interference, then interference is identified by jump procedure 2 and parameter is estimated
Meter；
Step 2, passive radar disturbance ecology and parameter estimation
Step 2.1, disturbance ecology
Shape information and the radar return information of active radar and passive radar reception that Active Radar is launched can be expressed as a K through information fusion
Dimension functionWhereinBeing the parameter set relevant with target and interference signal, A is
The amplitude collection that target and interference are constituted, ω is target and disturbs the frequency set constituted,The azimuth set constituted for target and interference,
θ is target and the angle of pitch set of interference composition, fdThe Doppler's collection constituted for target and interference；Signal after merging is carried out spy
Levying extraction, signal carries out polytype nonlinear transformation the most simultaneously, transformed rear signal is all represented by:
Wherein Sq=f (R1,R2,…Rk), k≤K, RkRepresent signal SqKth category feature parameter；Signal characteristic after each conversion is joined
Number uses interference type sorting algorithm based on neutral net to be identified interference, and at least one of which can successfully identify interference class
Type；
Step 2.2, parameter estimation
After interference is identified classification, for interference type, by the multichannel estimation technique or maximum likelihood method, it is carried out accordingly
Parameter estimation, its parameter specifically includes that interference signal and the amplitude of echo signal, Doppler and time delay；
Step 3, the interference type obtained according to passive radar in step 2 and interference parameter, select suitable Waveform Design criterion,
Constructing corresponding cost function, then select the Waveform Design algorithm of optimum to calculate the disaggregation making cost function optimum, utilization is tried to achieve
Optimal solution set construct optimum waveform；
The optimum waveform pulse signal that step 4, Active Radar step of transmitting 3 obtain, receives echo-signal simultaneously, and believes echo
Number carry out matched filtering process and doppler processing, then carry out anti-jamming evaluation, if testing result well, is carried out defeated by Evaluated effect
Going out display, effect is bad then uses data to process interference protection measure rejecting interference, and testing result is carried out output display.
A kind of active radar and passive radar based on Waveform Design works in coordination with anti-interference method, it is characterised in that described
Step 2.1 carries out Fourier transformation, Fourier Transform of Fractional Order, Short Time Fourier Transform and coupling to the signal after merging simultaneously
Conversion, then carries out feature extraction to signal after each transformation into itself.
A kind of active radar and passive radar based on Waveform Design works in coordination with anti-interference method, it is characterised in that institute
State and step 3 selects maximum signal noise ratio principle or stopband interfering energy minimum criteria construct corresponding cost function, then utilize conjugation
Gradient algorithm or loop iteration algorithm calculate the optimal solution of this cost function, reconstruct out optimum waveform.
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