CN107490791A - A kind of conformal array airborne radar clutter suppression method based on MIMO systems - Google Patents
A kind of conformal array airborne radar clutter suppression method based on MIMO systems Download PDFInfo
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- CN107490791A CN107490791A CN201610414677.9A CN201610414677A CN107490791A CN 107490791 A CN107490791 A CN 107490791A CN 201610414677 A CN201610414677 A CN 201610414677A CN 107490791 A CN107490791 A CN 107490791A
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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
- G01S7/42—Diversity systems specially adapted for radar
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- Radar, Positioning & Navigation (AREA)
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- Computer Networks & Wireless Communication (AREA)
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- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a kind of conformal array airborne radar clutter suppression method based on MIMO systems.The characteristics of this method combination MIMO radars antenna can form equivalent virtual array, MIMO systems are used for machine back of the body ring array and wing curve battle array conformal array airborne radar, and select suitable STAP methods to carry out clutter recognition based on the array feature.The present invention is disposed vertically an even linear array in machine back first and launches omnidirectional's orthogonal signalling, is then placed in machine back and curve battle array is placed on ring array or wing for receiving, equivalent virtual cylinder battle array or curved surface battle array can be formed after matched filtering；The suitable STAP methods of reselection complete the suppression to clutter；CFAR detections finally are carried out to data after processing.This method not only has MIMO systems and the advantage of conformal antenna concurrently, and can overcome traditional cylindrical array load greatly and influence carrier aircraft it is pneumatic the shortcomings that, and traditional wing conformal array pitching tie up angular resolution difference the shortcomings that.
Description
Technical field
The present invention relates to a kind of clutter suppression method based on MIMO system conformal array airborne radars, especially suitable for next
In generation, uses the radar of the airborne pulse Doppler (PD) of conformal array antenna.
Background technology
Modern war is proposed higher and higher to the stealth capabilities of airborne radar, maneuverability and target acquisition ability
It is required that conformal array antenna can effectively reduce carrier aircraft reflection cross section, itself anti-lethality is lifted；By using conformal with fuselage
Mode reduces flight resistance, improves the mobility of carrier aircraft；Meanwhile conformal array element point to it is different, when phased array beam scans
Gain decline and Sidelobe degradation and unobvious, these features meet above-mentioned requirements just.Therefore, conformal array airborne radar is next
For the important directions of airborne radar development.
Current more typical conformal array antenna form includes cylindrical array and wing battle array etc..Wherein, cylinder array antenna is placed
Carried on the back in machine, cylindrical antenna array element points to difference in all directions, and by working, array element handover mechanism completes comprehensive scanning, therefore
It can ensure that each side is consistent for scanning beam waveform, the serious broadening of main lobe and secondary lobe lift when overcoming planar phased array high scan angles
The problem risen, but because cylindrical array is not completely conformal in itself with fuselage, therefore load heavy burden is larger, and have a strong impact on carrier aircraft
Pneumatic property；Wing array antenna is distributed in carrier aircraft both wings, and antenna is conformal with aerofoil surface, the mode electromagnetic radiation of generally use end-fire
Ripple, can be achieved it is horizontal scanned to wide-angle beam, therefore be ideal conformal fashion, but due to wing vertical to size very
It is small, angular resolution vertically upward can not be obtained.
Multiple-input and multiple-output (MIMO) radar is a kind of new system radar to grow up in recent years, airborne MIMO radar
It is following new system radar hair because it has the performances such as excellent anti-reflective radiation, anti-interference, anti-stealthy and low target detection at a slow speed
The important trend of exhibition, belong to one of focus of current radar technical research.The most distinguishing feature of MIMO systems is more by launching
Individual orthogonal waveforms, the matched filtering in conjunction with each receiving channel are handled, and form the big new virtual array form of aperture several times.Than
Such as, be respectively used to launch and receive using two parallel linear arrays of MIMO systems, then it is equivalent to form the longer linear array in an aperture.Base
In the feature, if MIMO systems combined with conformal antenna, it can be expected to overcome intrinsic present in foregoing conformal array ask
Topic.Meanwhile suitable space-time adaptive processing (STAP) method is selected to enter MIMO system conformal array antenna airborne radar clutters
Row suppresses, and the moving target effective detection of the radar can be achieved.
The content of the invention
It is an object of the invention to avoid the weak point in above-mentioned background technology, conformal array airborne radar is used into MIMO
System, by setting transmitting antenna backwards perpendicular to machine, placed in machine back and conformation curve battle array is placed on ring array or wing
The mode of reception antenna, equivalent virtual array is formed, and select suitable STAP technologies to carry out clutter recognition, so as to realize airborne thunder
Up to the effective detection to moving target.The present invention program is applied to the airborne early warning radar of future generation for using conformal array antenna, special
It is not the airborne early warning radar and airbome battle-field reconnaissance surveillance radar using pulse-Doppler's system.
In order to realize above-mentioned goal of the invention, the invention provides a kind of based on the miscellaneous of MIMO system conformal array airborne radars
Ripple suppressing method, including following technical step：
(1) an even linear array antenna, each array element omnidirectional uniform emission orthogonal signalling ripple of antenna are disposed vertically in the carrier aircraft machine back of the body
Shape；
(2) place conformal reception antenna at other positions of carrier aircraft to receive for signal, and carry out matched filtering processing；
(3) according to linear restriction minimum output power criterion, space-time two-dimensional data is received to each array element and carry out space-time certainly
Adaptation is handled, and completes effective suppression of the airborne radar to clutter；
(4) CFAR processing is carried out to data after clutter recognition, completes the detection to moving target.
Wherein, transmitting antenna uses M array element even linear array antennas in step (1), and antennas orthogonal is positioned over the machine back of the body, each array element
Spacing is wavelength and transmitting omnidirectional orthogonal waveforms.
Reception antenna uses N array element conformal antennas in step (2), including is positioned over the ring array or both sides wing of machine back
On curve battle array；Each array element spacing of reception antenna is wavelength, and each array element carries out matched filtering processing to reception signal, after processing etc.
Effect forms N × M dimension virtual three-dimensional battle array receives echo-signals.
According to linear restriction minimum output power criterion in step (3), STAP processing is carried out to the echo data received,
STAP processing is carried out in array element-Doppler domain, and then realizes effective suppression of the airborne radar to clutter.
According to clutter recognition result in step (4), suitable CFAR detection algorithms are selected, are realized to the effective of moving target
Detection.
The advantage of the invention is that：
(1) present invention is based on MIMO systems, and the equivalent formation virtual cylinder array of a vertical linear array and a ring array was both protected
Cylindrical array and MIMO system inherent advantages have been stayed, has solved the problems, such as that cylindrical array load-carrying is big again and influences carrier aircraft aeroperformance.
(2) present invention is based on MIMO systems, by the equivalent formation two two of a vertical linear array and two wing conformation curve battle arrays
Curved surface battle array is tieed up, wing conformal array and MIMO system inherent advantages had both been remained, and had solved wing conformal array again vertically to resolution
The problem of power difference.
(3) two kinds of MIMO conformal array airborne radar forms proposed by the invention, due to being provided with front pitch freedom,
Therefore short range non-stationary clutter can also effectively be suppressed；
(4) thinking of the present invention is combined, also MIMO systems can be applied to other conformal array radars.
Brief description of the drawings
Fig. 1 is the structured flowchart of embodiments of the invention, and Fig. 2 is vertical linear array, ring array and its formed virtual cylinder
Array schematic diagram, Fig. 3 are vertical linear array, wing conformation curve battle array and its formed virtual curved face battle array schematic diagram.Reference picture 1, this
The embodiment of invention is by airborne radar spatial domain transmitter unit 1, spatial domain receiving unit 2, AD conversion unit 3, STAP processing units 4
Formed with CFAR processing units 5.Above-mentioned spatial domain transmitting, spatial domain reception, analog-to-digital conversion, STAP processing and CFAR processing can be
Programming realization on general programmable signal-processing board.
Embodiment
The principle for implementing the present invention is as follows：Airborne MIMO radar is vertically believed by machine back to antennas transmitting orthogonal first
Number, fuselage ring array (see Fig. 2) or the matched filtering of wing curve (see Fig. 3) conformal array antenna receive spatial domain echo data；So
After carry out analog-to-digital conversion, realize the digitlization of echo data；STAP processing is carried out to receiving space-time two-dimensional data again, is completed to miscellaneous
Effective suppression of ripple；CFAR processing is finally carried out to output result, and then completes the detection to moving target.
Assuming that airborne MIMO radar vertical radiator array number is M, orientation reception antenna array element number is N, and one relevant
Receive K pulse in pulse recurrence interval, M=3, N=8, K=128 in example, reception antenna array element spacing dRAnd dTIt is impartial
In wavelength X, the detailed step illustratively entirely invented with reference to Fig. 2 and example：
(1) spatial domain transmitter unit 1 is vertically launching the orthogonal dimension signal of M × 1, each K relevant arteries and veins of array element transmitting to antenna
Punching；
(2) spatial domain receiving unit 2 is filtered processing to antenna N roads in level using matched filter, is equivalent to be formed
Virtual cylinder array received echo (see Fig. 2), finally give the echo data signal X that NMK × 1 is tieed up：
Xl=Cl+Nl (1)
Wherein, l represents l-th of range gate, and N represents noise signal, and C represents noise signal, and has
Wherein, NcClutter block number in a rang ring is represented, L represents range gate number, βiRepresent clutter block for width
Degree, θiWithMain beam azimuth and the angle of pitch, d are represented respectivelyTAnd dRRespectively transmitting antenna and reception antenna array element coordinate bit
Put pointing vector, FdFor Doppler frequency, TrFor pulse repetition period, SstAnd SsrRespectively transmitting antenna and reception antenna are corresponding
Spatial domain steering vector, StFor time domain steering vector,Accumulated for Kronecker.
(3) down-converted is carried out as the echo-signal received by radar, then carries out modulus in AD conversion unit 3
Conversion, and the echo data after digitlization is stored into system.
(4) STAP processing units 4 receive data to space-time and carry out clutter recognition processing, and STAP adaptive weights are represented by
W=μ Rz -1Sz (7)
Wherein,Represent the constant coefficient of weights, Rz=THRT is represented after carrying out discrete Fourier transform
Clutter covariance matrix, Sz=THST represents the space-time two-dimensional steering vector after discrete Fourier transform, and T is time domain transformation matrix,Represent space-time steering vector corresponding to virtual plane array.
(5) CFAR processing units 5 carry out CAFR processing to the data after self-adaptive processing, and then complete the airborne thunder of phased array
Up to the detection process to moving target.Data can after having handled is input to terminal device and shown.
Although being described in conjunction with the accompanying embodiments of the present invention, those of ordinary skill in the art can be in appended power
Profit makes various deformations or amendments in the range of requiring.
Claims (4)
1. a kind of conformal array airborne radar clutter suppression method based on MIMO systems, including following technical step：
(1) an even linear array antenna, each array element omnidirectional uniform emission orthogonal signal waveforms of antenna are disposed vertically in the carrier aircraft machine back of the body；
(2) place conformal reception antenna at other positions of carrier aircraft to receive for signal, and carry out matched filtering processing；
(3) according to linear restriction minimum output power criterion, it is adaptive that space-time two-dimensional data progress space-time is received to reception antenna
It should handle, complete effective suppression of the airborne radar to clutter；
(4) CFAR processing is carried out to data after clutter recognition, completes the detection to moving target.
2. a kind of conformal array airborne radar clutter suppression method based on MIMO systems according to claim 1, its feature
The transmitting antenna form being in step (1)；Transmitting antenna uses the even linear array antenna for including M array element, and antennas orthogonal is put
The machine back of the body is placed in, each array element spacing is wavelength size and transmitting omnidirectional orthogonal waveforms.
3. a kind of conformal array airborne radar clutter suppression method based on MIMO systems according to claim 1, its feature
The reception antenna form being in step (2)；Reception antenna uses the conformal antenna for including N number of array element, including is positioned over the machine back of the body
On ring array, the curve battle array on the wing of both sides；Each array element spacing of reception antenna is wavelength size, and reception signal is matched
Filtering process, N × M roads echo-signal of virtual three-dimensional battle array reception is equivalent to after processing；N and M is all higher than being equal to 2.
4. a kind of conformal array airborne radar clutter suppression method based on MIMO systems according to claim 1, its feature
It is in step (3) that space-time adaptive processing method of the selection based on virtual three-dimensional battle array carries out clutter recognition；Wherein, it is contemplated that three
It is more to tie up the array 1 system free degree, space-time adaptive processing method selection is handled in array element-Doppler domain local；STAP is adaptive
Weights are answered to be expressed as：
W=μ Rz -1Sz
Wherein,Represent the constant coefficient of weights, Rz=THRT represents to carry out the clutter association after discrete Fourier transform
Variance matrix, Sz=THST represents the space-time two-dimensional steering vector after discrete Fourier transform, and T is time domain transformation matrix,Represent space-time steering vector corresponding to virtual three-dimensional array, StFor time domain steering vector, SsrAnd SstRespectively
For spatial domain steering vector corresponding to reception antenna and transmitting antenna,Accumulated for Kronecker.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108549077A (en) * | 2018-03-20 | 2018-09-18 | 西安电子工程研究所 | A kind of radar seeker scan method |
| CN111289960A (en) * | 2020-05-08 | 2020-06-16 | 之江实验室 | Method for improving angular resolution of MIMO radar and target positioning method |
| CN114779198A (en) * | 2022-04-24 | 2022-07-22 | 中国人民解放军空军预警学院 | Conformal array airborne radar space-time clutter spectrum adaptive compensation and clutter suppression method |
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| US8570210B1 (en) * | 2011-06-21 | 2013-10-29 | Lockheed Martin Corporation | Aircraft MIMO radar |
| CN104345299A (en) * | 2014-11-03 | 2015-02-11 | 西安电子科技大学 | Airborne MIMO (Multiple Input Multiple Output) radar space-time self-adaptive processing method based on simplified EC |
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| US8570210B1 (en) * | 2011-06-21 | 2013-10-29 | Lockheed Martin Corporation | Aircraft MIMO radar |
| CN104345299A (en) * | 2014-11-03 | 2015-02-11 | 西安电子科技大学 | Airborne MIMO (Multiple Input Multiple Output) radar space-time self-adaptive processing method based on simplified EC |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108549077A (en) * | 2018-03-20 | 2018-09-18 | 西安电子工程研究所 | A kind of radar seeker scan method |
| CN108549077B (en) * | 2018-03-20 | 2021-09-17 | 西安电子工程研究所 | Radar seeker scanning method |
| CN111289960A (en) * | 2020-05-08 | 2020-06-16 | 之江实验室 | Method for improving angular resolution of MIMO radar and target positioning method |
| CN111289960B (en) * | 2020-05-08 | 2020-09-04 | 之江实验室 | Method for improving angular resolution of MIMO radar and target positioning method |
| CN114779198A (en) * | 2022-04-24 | 2022-07-22 | 中国人民解放军空军预警学院 | Conformal array airborne radar space-time clutter spectrum adaptive compensation and clutter suppression method |
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