CN106093883B - The lower main distribution calculation method of principal subsidiary lobe ground and sea clutter is detected after regarding tail under a kind of radar - Google Patents
The lower main distribution calculation method of principal subsidiary lobe ground and sea clutter is detected after regarding tail under a kind of radar Download PDFInfo
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- CN106093883B CN106093883B CN201610377418.3A CN201610377418A CN106093883B CN 106093883 B CN106093883 B CN 106093883B CN 201610377418 A CN201610377418 A CN 201610377418A CN 106093883 B CN106093883 B CN 106093883B
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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
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
- G01S7/295—Means for transforming co-ordinates or for evaluating data, e.g. using computers
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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
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
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Abstract
The invention discloses a kind of main distribution calculation methods of principal subsidiary lobe ground and sea clutter comprising the steps of: and it is strong and weak according to detection wave beam all directions gain after regarding tail under radar, determine the main distribution corresponding region of principal subsidiary lobe ground and sea clutter；Corresponding clutter point is chosen in corresponding region, and calculates the position coordinates of all clutter points；According to the position coordinates of the position coordinates of radar, velocity vector parameter and all clutters point, the relative distance and opposite Doppler frequency of all clutter points and radar are calculated；Maximum unam, pulse recurrence frequency parameter in conjunction with radar emission signal, the apparent range and view for calculating all clutter points are in Doppler frequency；The apparent range and view for quantifying all clutter points map to distance-Doppler domain in Doppler frequency, and by the quantized distance of all clutter points and quantization Doppler frequency, obtain the accurate location of the main distribution of principal subsidiary lobe ground and sea clutter.The present invention calculates strong real-time, is effectively promoted and detects power and tracking performance after regarding tail under radar.
Description
Technical field
The present invention relates to detection technology field after tail is regarded under radar, and in particular to detects lower major-minor after regarding tail under a kind of radar
The main distribution calculation method of valve ground and sea clutter.
Background technique
Ground and sea clutter is the maximum restraining factors for detecting and tracking target capabilities after regarding tail under radar.It is detected after lower view tail empty
Middle target, target echo signal fall into minor lobe clutter area, and repetition rate waveform is for detecting target in radar emission.Opposite Gao Chong
Complex frequency waveform, repetition rate waveform can reduce minor lobe clutter apart from aliasing degree in, and further pass through distance dimension
Cutting reduces minor lobe clutter power, and radar is made to have detectivity after lower view tail.But due to minor lobe clutter radar handle away from
From on-Doppler domain and non-uniform Distribution, but there are strength distributions, when target echo signal falls into strong minor lobe clutter region
When, detection signal to noise ratio is on the one hand greatly reduced, radar range is influenced；On the other hand radar error lock has been significantly greatly increased
Or the probability of tracking minor lobe clutter, cause to lose target, such case needs to improve.
Summary of the invention
The purpose of the present invention is to provide detect the lower main distribution calculating side of principal subsidiary lobe ground and sea clutter after regarding tail under a kind of radar
Method can obtain main distribution accurate location of the ground and sea clutter on distance-Doppler domain in line computation, it is tight to solve strong minor lobe clutter
The problem of ghost image detects after being thundering up to lower view tail and tracks target capabilities makes target echo when under radar depending on detecting target after tail
Signal avoids strong minor lobe clutter, avoids falling into the necessary reference conditions of strong minor lobe clutter region offer, is effectively promoted under radar and regard tail
Power and tracking performance are detected afterwards.
In order to achieve the above object, the invention is realized by the following technical scheme: detecting lower master after regarding tail under a kind of radar
The main distribution calculation method of minor lobe ground and sea clutter, its main feature is that comprising the steps of:
S1, according to detecting after view tail under radar, the gain of wave beam all directions is strong and weak, determines the main distribution pair of principal subsidiary lobe ground and sea clutter
Answer region；
S2, corresponding clutter point is chosen in the main distribution corresponding region of principal subsidiary lobe ground and sea clutter, and calculate all clutter points
Position coordinates；
S3, according to the position coordinates of the position coordinates of radar, the velocity vector parameter of radar and all clutters point, calculate institute
There are the relative distance and opposite Doppler frequency of clutter point and radar；
The pulse recurrence frequency parameter of S4, the maximum unam in conjunction with radar emission signal and radar emission signal,
The apparent range and view for calculating all clutter points are in Doppler frequency；
S5, the apparent range of all clutter points of quantization and view are in Doppler frequency, and by the quantized distance of all clutter points
Distance-Doppler domain is mapped to quantization Doppler frequency, obtains the accurate location of the main distribution of principal subsidiary lobe ground and sea clutter.
The step S1 includes:
S1.1, the frame of reference and platform coordinate system are established respectively；
S1.2, master is arranged with the direction angle under platform coordinate system according to practical radar directional pattern strength distribution feature
Minor lobe ground and sea clutter long distance boundary point and low coverage boundary point direction opposite with radar antenna, and according to radar under the frame of reference
Position and posture calculate separately the coordinate of long distance boundary point and low coverage boundary point under the frame of reference；
S1.3, under the frame of reference, principal subsidiary lobe ground and sea clutter is constituted by the line of long distance boundary point and low coverage boundary point
The computation interval of main distribution corresponding region.
The origin of the frame of reference is set on ground/sea in the step S1.1, and X-axis is north orientation, and Y-axis is day
To Z axis is east orientation, and radar present position is defined as PR, the coordinate under the frame of reference is (xR, yR, zR), it is fixed according to the right hand
Then determine that radar posture, radar posture are defined as (Ψ, θ, γ), Ψ indicates yaw angle, and θ indicates that pitch angle, γ indicate roll angle.
Platform coordinate system in the step S1.1 is by frame of reference origin translation to radar present position, then general
It is successively rotated according to Ψ, θ, γ attitude angle three times, obtains platform coordinate system PRX " Y " Z ", being directed toward angle (α, β) indicates thunder
Up to antenna beam, the ground/relative positional relationship of sea location point and radar in platform coordinate system, α indicates azimuth, β table
Show pitch angle.
Coordinate calculation method of the long distance boundary point under the frame of reference includes in the step S1.2:
Under platform coordinate system, angle is directed toward by long distance boundary point, direction unit vector is calculated；
It is converted by Eulerian coordinates, the direction unit vector under platform coordinate system is transformed into the frame of reference, calculated
It obtains being directed toward unit vector under the frame of reference；
By being directed toward unit vector under the frame of reference, long distance boundary point is calculated under the frame of reference in platform coordinate
Coordinate.
Coordinate calculation method of the low coverage boundary point under the frame of reference includes in the step S1.2:
Under platform coordinate system, angle is directed toward by low coverage boundary point, direction unit vector is calculated；
It is converted by Eulerian coordinates, the direction unit vector under platform coordinate system is transformed into the frame of reference, calculated
It obtains being directed toward unit vector under the frame of reference；
By being directed toward unit vector under the frame of reference, low coverage boundary point is calculated under the frame of reference in platform coordinate
Coordinate.
The step S2 includes:
Under the frame of reference, according to the coordinate of the coordinate of long distance boundary point and low coverage boundary point calculate long distance boundary point and
The relative distance of low coverage boundary point；
Under the frame of reference, long distance boundary point is calculated by the coordinate of long distance boundary point and the coordinate of low coverage boundary point and is arrived
The angle of low coverage boundary point line and Z axis；
A number is taken on setting long distance boundary point and low coverage boundary point line, successively calculates each selected point relative to low coverage side
(X, the Z) coordinate of the distance and each selected point of boundary's point in the frame of reference；
Successively (X, Z) coordinate according to each selected point in the frame of reference, inquires the Y of each selected point from altitude data
Coordinate, to obtain position coordinates of all clutter points under the frame of reference.
The calculation method of the relative distance of all clutter points and radar in the step S3 are as follows:
Under the frame of reference, using the position coordinates of clutter point and the position coordinates of radar, according to distance between two points meter
The relative distance of all clutter points and radar can be obtained by calculating formula.
The calculation method of the opposite Doppler frequency of all clutter points and radar in the step S3 are as follows:
Under the frame of reference, using the position coordinates of clutter point and the position coordinates of radar, pointing vector is calculated；
The angle of each clutter point and radar line and directional velocity is calculated using pointing vector and radar speed vector；
Calculate to do odds and ends the opposite Doppler frequency of wave point and radar using platform aggregate velocity value.
A number N is taken on the long distance boundary point and low coverage boundary point line, the following conditions need to be met:
Wherein, Δ R indicates adjacent and takes a little direct distance interval, RFNIndicate that long distance boundary point and low coverage boundary point are direct
Relative distance, N expression take a number, Δ RRIndicate radar resolution ratio.
The lower main distribution calculation method of principal subsidiary lobe ground and sea clutter and prior art phase are detected after regarding tail under a kind of radar of the present invention
Than having the advantage that by determining that main be distributed of principal subsidiary lobe clutter simplifies clutter region with ground/water area corresponding relationship
Zoning is reduced in selection, the relative distance and opposite Doppler frequency of all clutter units and radar in zoning, and reflects
It is incident upon distance-Doppler domain, obtains the accurate location of the main distribution of clutter, can be regarded under radar when detecting target after tail, quickly
Principal subsidiary lobe clutter echo-signal is calculated in the main distributing position in distance-Doppler domain, utilizes echo signal and strong minor lobe miscellaneous for radar
Wave signal relative distance and frequency relation judgement avoid echo signal from falling into or pass through strong minor lobe clutter area offer core
Parameter and important evidence；The present invention calculates strong real-time, can satisfy requirement of the airborne, missile-borne radar to processing real-time.
Detailed description of the invention
Fig. 1 is the process that the lower main distribution calculation method of principal subsidiary lobe ground and sea clutter is detected after regarding tail under a kind of radar of the present invention
Figure；
Fig. 2 is the geometrical relationship block diagram under radar depending on detecting after tail；
Fig. 3 is the main distribution schematic diagram of calculation result of principal subsidiary lobe ground and sea clutter in the embodiment of the present invention.
Specific embodiment
The present invention is further elaborated by the way that a preferable specific embodiment is described in detail below in conjunction with attached drawing.
As shown in Figure 1, the lower main distribution calculation method of principal subsidiary lobe ground and sea clutter is detected after regarding tail under a kind of radar, comprising following
Step:
S1, according to detecting after view tail under radar, the gain of wave beam all directions is strong and weak, determines the main distribution pair of principal subsidiary lobe ground and sea clutter
Answer region.
Step S1 specifically includes:
S1.1, the frame of reference and platform coordinate system are established respectively, as shown in Figure 2；
Wherein, the origin of the frame of reference is set on ground/sea, and X-axis is north orientation, Y-axis be day to, Z axis is east orientation,
Radar present position is defined as PR, the coordinate under the frame of reference is (xR, yR, zR), radar appearance is determined according to the right-hand rule
State, radar posture are defined as (Ψ, θ, γ), and Ψ indicates yaw angle, and θ indicates that pitch angle, γ indicate roll angle；Platform coordinate system is
It is successively rotated, is obtained three times according to Ψ, θ, γ attitude angle by frame of reference origin translation to radar present position, then by it
To platform coordinate system PRX " Y " Z ", being directed toward angle (α, β) indicates radar antenna wave beam, ground/sea location point and radar in platform
Relative positional relationship in coordinate system, α indicate azimuth, and β indicates pitch angle；
S1.2, master is arranged with the direction angle under platform coordinate system according to practical radar directional pattern strength distribution feature
Minor lobe ground and sea clutter long distance boundary point P1With low coverage boundary point PNIt is opposite with radar antenna to be directed toward, long distance boundary point P1With low coverage side
Boundary point PNDirection angle be respectively (αFar, βFar) and (αNear, βNear), and according to position of the radar under the frame of reference and appearance
State calculates separately long distance boundary point P1With low coverage boundary point PNCoordinate under the frame of reference；
Long distance boundary point P1Coordinate calculation method under the frame of reference includes:
Under platform coordinate system, angle (α is directed toward by long distance boundary pointFar, βFar) be calculated and be directed toward unit vector (xP1,
yP1, zP1)；
xP1=cos (βFar)×cos(αFar)
yP1=cos (βFar)×sin(αFar)
zP1=sin (- βFar)
It is converted by Eulerian coordinates, by the direction unit vector (x under platform coordinate systemP1, yP1, zP1) it is transformed into benchmark seat
In mark system, direction unit vector (x under the frame of reference is calculatedU1, yU1, zU1)；
By being directed toward unit vector under the frame of reference, long distance boundary point P is calculated in platform coordinate1In the frame of reference
Under coordinate (x1, y1, z1)；
Similarly, low coverage boundary point PNCoordinate calculation method under the frame of reference includes:
Under platform coordinate system, angle is directed toward by low coverage boundary point, direction unit vector is calculated；
It is converted by Eulerian coordinates, the direction unit vector under platform coordinate system is transformed into the frame of reference, calculated
It obtains being directed toward unit vector under the frame of reference；
By being directed toward unit vector under the frame of reference, low coverage boundary point P is calculated in platform coordinateNIn the frame of reference
Under coordinate (xN, yN, zN)；
S1.3, under the frame of reference, by long distance boundary point P1With low coverage boundary point PNLine constitute principal subsidiary lobe sea it is miscellaneous
The computation interval of the main distribution corresponding region of wave.
S2, corresponding clutter point is chosen in the main distribution corresponding region of principal subsidiary lobe ground and sea clutter, and calculate all clutter points
Position coordinates.
Step S2 specifically includes:
Under the frame of reference, according to the coordinate (x of long distance boundary point1, y1, z1) and low coverage boundary point coordinate (xN, yN,
zN) calculate long distance boundary point P1With low coverage boundary point PNRelative distance RFN；
Under the frame of reference, pass through the coordinate (x of long distance boundary point1, y1, z1) and low coverage boundary point coordinate (xN, yN,
zN) calculate long distance boundary point P1To low coverage boundary point PNThe angle ε of line and Z axis；
Set long distance boundary point P1With low coverage boundary point PNA number N is taken on line, successively calculates each selected point relative to close
Away from boundary point PNDistance RnNAnd (X, Z) coordinate (x of each selected point in the frame of referencen, zn)；
Wherein, take a number N that need to meet condition
Wherein Δ RRFor radar resolution ratio
RnN=(N-n+1) × Δ R
xn=RnN×sin(ε)+xN
zn=RnN×cos(ε)+zN
Successively (X, the Z) coordinate (x according to each selected point in the frame of referencen, zn), each choosing is inquired from altitude data
Take Y coordinate y a littlen, wherein yn=HGn, HGnGround/sea level height where selected point is sat with obtaining all clutter points in benchmark
Position coordinates (x under mark systemn, yn, zn), n is by 1 to N value.
S3, according to the position coordinates of the position coordinates of radar, the velocity vector parameter of radar and all clutters point, calculate institute
There are the relative distance and opposite Doppler frequency of clutter point and radar.
Step S3 specifically includes:
Under the frame of reference, the position coordinates (x of clutter point is utilizedn, yn, zn) and radar position coordinates (xR, yR,
zR), the relative distance R of all clutter points and radar can be obtained according to distance between two points calculation formulan；
Under the frame of reference, the position coordinates (x of clutter point is utilizedn, yn, zn) and radar position coordinates (xR, yR,
zR), pointing vector is calculated
Utilize pointing vectorWith radar speed vectorEach clutter point and radar line is calculated
With the included angle of directional velocityn；
The opposite Doppler frequency F of clutter point and radar is calculated using radar aggregate velocity valuen；
Wherein, λ is radar emission signal wavelength, and radar speed vector is obtained by inertial device, airborne radar or missile-borne
Radar, that is, corresponding platform velocity vector.
The pulse recurrence frequency parameter of S4, the maximum unam in conjunction with radar emission signal and radar emission signal,
The apparent range and view for calculating all clutter points are in Doppler frequency.
Apparent range Δ R in step S4nWith view in Doppler frequency Δ FnCalculation formula be respectively as follows:
ΔRn=mod (Rn, Rmax)
Wherein, RmaxTo emit signal maximum unam；
ΔFn=mod (Fn, PRF)
Wherein, PRF is the pulse recurrence frequency for emitting signal.
S5, the apparent range of all clutter points of quantization and view are in Doppler frequency, and by the quantized distance of all clutter points
Distance-Doppler domain (Δ QR is mapped to quantization Doppler frequencyn, Δ QFn), (n=1,2 ... N), sea is miscellaneous with obtaining principal subsidiary lobe
The accurate location of the main distribution of wave.
In step S5, quantify the apparent range Δ R of all clutter pointsnWith view in Doppler frequency Δ Fn, obtain quantized distance
ΔQRnWith quantization Doppler frequency Δ QFn, wherein
Wherein, ΔRR is radar resolution ratio；
Wherein, Δ FRRadar frequency resolution ratio.
As shown in figure 3, radar fix (61310,14958,52736) are given, and radar posture (- 38, -22,0), speed
Vector (709, -371,564), long distance boundary point are directed toward (- 0.5, -10), and low coverage boundary point is directed toward (0, -80), radar emission letter
Number pulse recurrence frequency 41kHz under the conditions of, the main distribution calculated result figure of a principal subsidiary lobe ground and sea clutter.
It is discussed in detail although the contents of the present invention have passed through above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read above content, for of the invention
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. detecting the lower main distribution calculation method of principal subsidiary lobe ground and sea clutter after regarding tail under a kind of radar, which is characterized in that comprising following
Step:
S1, according to detecting after view tail under radar, the gain of wave beam all directions is strong and weak, determines the corresponding area of the main distribution of principal subsidiary lobe ground and sea clutter
Domain；
S2, corresponding clutter point is chosen in the main distribution corresponding region of principal subsidiary lobe ground and sea clutter, and calculate the position of all clutter points
Set coordinate；
S3, according to the position coordinates of the position coordinates of radar, the velocity vector parameter of radar and all clutters point, calculate all miscellaneous
The relative distance and opposite Doppler frequency of wave point and radar；
The pulse recurrence frequency parameter of S4, the maximum unam in conjunction with radar emission signal and radar emission signal calculate
The apparent range and view of all clutter points are in Doppler frequency；
S5, the apparent range of all clutter points of quantization and view are in Doppler frequency, and by the quantized distance and amount of all clutter points
Change Doppler frequency and map to distance-Doppler domain, obtains the accurate location of the main distribution of principal subsidiary lobe ground and sea clutter.
2. detecting the lower main distribution calculation method of principal subsidiary lobe ground and sea clutter, feature after regarding tail under radar as described in claim 1
It is, the step S1 includes:
S1.1, the frame of reference and platform coordinate system are established respectively；
S1.2, principal subsidiary lobe is arranged with the direction angle under platform coordinate system according to practical radar directional pattern strength distribution feature
Ground and sea clutter long distance boundary point and low coverage boundary point direction opposite with radar antenna, and the position according to radar under the frame of reference
It sets and calculates separately the coordinate of long distance boundary point and low coverage boundary point under the frame of reference with posture；
S1.3, under the frame of reference, principal subsidiary lobe ground and sea clutter master point is made of the line of long distance boundary point and low coverage boundary point
The computation interval of cloth corresponding region.
3. detecting the lower main distribution calculation method of principal subsidiary lobe ground and sea clutter, feature after regarding tail under radar as claimed in claim 2
It is, the origin of the frame of reference is set on ground/sea in the step S1.1, and X-axis is north orientation, and Y-axis is day to Z
Axis is east orientation, and radar present position is defined as PR, the coordinate under the frame of reference is (xR,yR,zR), it is true according to the right-hand rule
Determine radar posture, radar posture is defined as (Ψ, θ, γ), and Ψ indicates yaw angle, and θ indicates the pitch angle under the frame of reference, γ
Indicate roll angle.
4. detecting the lower main distribution calculation method of principal subsidiary lobe ground and sea clutter, feature after regarding tail under radar as claimed in claim 3
Be, the platform coordinate system in the step S1.1 be by frame of reference origin translation to radar present position, then by its
It is successively rotated three times according to Ψ, θ, γ attitude angle, obtains platform coordinate system PRX " Y " Z ", being directed toward angle (α, β) indicates radar
Antenna beam, the ground/relative positional relationship of sea location point and radar in platform coordinate system, α indicate azimuth, and β is indicated
Pitch angle under platform coordinate system.
5. detecting the lower main distribution calculation method of principal subsidiary lobe ground and sea clutter, feature after regarding tail under radar as claimed in claim 4
It is, Coordinate calculation method of the long distance boundary point under the frame of reference includes in the step S1.2:
Under platform coordinate system, angle is directed toward by long distance boundary point, direction unit vector is calculated；
It is converted by Eulerian coordinates, the direction unit vector under platform coordinate system is transformed into the frame of reference, is calculated
Unit vector is directed toward under the frame of reference；
By being directed toward unit vector under the frame of reference, seat of the long distance boundary point under the frame of reference is calculated in platform coordinate
Mark.
6. detecting the lower main distribution calculation method of principal subsidiary lobe ground and sea clutter, feature after regarding tail under radar as claimed in claim 5
It is, Coordinate calculation method of the low coverage boundary point under the frame of reference includes in the step S1.2:
Under platform coordinate system, angle is directed toward by low coverage boundary point, direction unit vector is calculated；
It is converted by Eulerian coordinates, the direction unit vector under platform coordinate system is transformed into the frame of reference, is calculated
Unit vector is directed toward under the frame of reference；
By being directed toward unit vector under the frame of reference, seat of the low coverage boundary point under the frame of reference is calculated in platform coordinate
Mark.
7. detecting the lower main distribution calculation method of principal subsidiary lobe ground and sea clutter, feature after regarding tail under radar as claimed in claim 6
It is, the step S2 includes:
Under the frame of reference, long distance boundary point and low coverage are calculated according to the coordinate of the coordinate of long distance boundary point and low coverage boundary point
The relative distance of boundary point；
Under the frame of reference, long distance boundary point is calculated to low coverage by the coordinate of long distance boundary point and the coordinate of low coverage boundary point
The angle of boundary point line and Z axis；
A number is taken on setting long distance boundary point and low coverage boundary point line, successively calculates each selected point relative to low coverage boundary point
(X, Z) coordinate in the frame of reference of distance and each selected point；
Successively (X, Z) coordinate according to each selected point in the frame of reference, the Y that each selected point is inquired from altitude data are sat
Mark, to obtain position coordinates of all clutter points under the frame of reference.
8. detecting the lower main distribution calculation method of principal subsidiary lobe ground and sea clutter, feature after regarding tail under radar as claimed in claim 7
It is, the calculation method of the relative distance of all clutter points and radar in the step S3 are as follows:
Under the frame of reference, using the position coordinates of clutter point and the position coordinates of radar, calculated according to distance between two points public
The relative distance of Shi Ke get all clutter points and radar.
9. detecting the lower main distribution calculation method of principal subsidiary lobe ground and sea clutter, feature after regarding tail under radar as claimed in claim 7
It is, the calculation method of the opposite Doppler frequency of all clutter points and radar in the step S3 are as follows:
Under the frame of reference, using the position coordinates of clutter point and the position coordinates of radar, pointing vector is calculated；
The angle of each clutter point and radar line and directional velocity is calculated using pointing vector and radar speed vector；
The opposite Doppler frequency of clutter point and radar is calculated using platform aggregate velocity value.
10. detecting the lower main distribution calculation method of principal subsidiary lobe ground and sea clutter, feature after regarding tail under radar as claimed in claim 7
It is, takes a number N on the long distance boundary point and low coverage boundary point line, the following conditions need to be met:
Wherein, Δ R indicates adjacent and takes a little direct distance interval, RFNIndicate that long distance boundary point and low coverage boundary point are directly opposite
Distance, N expression take a number, Δ RRIndicate radar resolution ratio.
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| CN106646392B (en) * | 2017-01-11 | 2019-06-14 | 胡文 | A kind of target minor lobe clutter removing method based on complex network |
| CN107607916B (en) * | 2017-08-18 | 2020-07-31 | 上海无线电设备研究所 | Self-defense type speed and distance joint deception jamming resisting method |
| CN111812598B (en) * | 2020-07-30 | 2022-03-22 | 中国电波传播研究所（中国电子科技集团公司第二十二研究所） | Time domain and frequency domain multi-feature-based ground and sea clutter classification method |
| CN113608209B (en) * | 2021-08-04 | 2023-09-19 | 上海无线电设备研究所 | Calculation method for main lobe clutter time-frequency domain distribution of airborne radar |
| CN116224249B (en) * | 2023-03-29 | 2023-11-21 | 上海雷骥电子科技有限公司 | Doppler frequency width acquisition method for main lobe clutter region of airborne radar |
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| Ocean-clutter model for high-frequency radar;R.H. Khan;《IEEE Journal of Oceanic Engineering 》;19910430;第16卷(第2期);第181-188页 |
| 机载线性调频-捷变频雷达地海杂波特性;王海涛 等;《系统工程与电子技术》;20070715;第29卷(第7期);第1070-1072页 |
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| CN106093883A (en) | 2016-11-09 |
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