CN109031232A - A kind of adaptive blanking coefficient altitudeline clutter suppressing method - Google Patents
A kind of adaptive blanking coefficient altitudeline clutter suppressing method Download PDFInfo
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- CN109031232A CN109031232A CN201810897281.3A CN201810897281A CN109031232A CN 109031232 A CN109031232 A CN 109031232A CN 201810897281 A CN201810897281 A CN 201810897281A CN 109031232 A CN109031232 A CN 109031232A
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- clutter
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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
- G01S7/414—Discriminating targets with respect to background clutter
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- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
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- Radar Systems Or Details Thereof (AREA)
Abstract
The present invention relates to a kind of adaptive blanking coefficient altitudeline clutter suppressing methods; the adaptive blanking coefficient altitudeline clutter suppressing method includes: S1: being obtained in the antenna direction diagram of actual measurement; when primary antenna side lobe gain is higher than protection antenna gain, the corresponding antenna parameter A of antenna；S2: the corresponding antenna parameter C of present level line clutter incident angle is obtained according to the parameter information of aircraft inertial navigation transmitting；S3: the antenna parameter A numerical value of comparison present level line clutter incident angle corresponding antenna parameter C numerical value and actual measurement then uses new blanking coefficient if the former falls into latter range, and on the contrary then blanking coefficient remains unchanged.Adaptive blanking coefficient altitudeline clutter suppressing method of the invention can inhibit altitudeline clutter to the influence of target detection to greatest extent, reduce the false alarm rate of radar, improve the detection performance of radar.
Description
Technical field
The invention belongs to Radar Signal Processing Technology field more particularly to a kind of adaptive blanking coefficient altitudeline clutter suppressions
Method processed.
Background technique
Detect that echo signal is that modern Airborne pulse Doppler radar (abbreviation PD radar) is basic from strong clutter environment
Function, to realize this basic function, radar generally emits the waveform of diversified forms.It is different according to the pulse recurrence frequency of waveform
High pulse repetition frequency (High pulse repetition frequency, HPRF), medium-PRF can be divided into
(Medium Pulse Repetition Frequency, MPRF), low pulse repetition frequency (Low Pulse Repetition
Frequency, LPRF).Hemisphere echo-signal before height weight waveform is mainly used for, target and carrier aircraft relative velocity are larger at this time, return
Wave Doppler frequency is higher, and Gao Zhongying transmitting signal speed will not obscure；Low heavy waveform is mainly used for distant object, returns at this time
Wave Doppler frequency is fuzzy, but is not obscured apart from detection；General speed and distance all can when middle heavy signal waveform detection
It is fuzzy.But it can be by the period (Pulse Repetition Interval, PRI) of repetition signal in changing to solve
The fog-level of speed and distance.
MPRF in the detection waveform of three kinds of forms is because have comprehensive detection, good ranging and the performance that tests the speed is from forming
For the preferred waveform of modern Airborne PD radar.But repetition waveform works in use, the clutter that radar needs to fight is more complex, has
The main lobe echo on ground, ground sidelobe echo and it is fuzzy after land clutter.PD radar, which generally passes through aircraft motion com pensation, to be made to lead
Clutter frequency is zeroed and slowly moving target detection protection zone is arranged to be influenced to eliminate main-lobe clutter, and sidelobe clutter is generally logical
Overprotection antenna blanking solves.
Minor lobe clutter has two o'clock to radar performance influence: first is to increase detections of radar false-alarm, and clutter itself can be taken as
Echo signal error detection comes out；Second is distance-speed unit noise gate where improving real goal, reduces target
Detection probability；The influence with altitudeline clutter to radar performance is the most prominent again in secondary sidelobe clutter, and altitudeline clutter is from load
The ground sidelobe echo received immediately below machine radar, due to special incident angle, the incident distance of relative close and big
The irradiated area of range, altitudeline clutter are detected the performance that radar is seriously affected as target sometimes.Therefore, most
Influence of the inhibition altitudeline clutter of limits in target detection has important meaning to Airborne PD Radar performance is improved.
Summary of the invention
The object of the present invention is to provide a kind of adaptive blanking coefficient altitudeline clutter suppressing methods, for solving above-mentioned ask
Topic.
In order to achieve the above objectives, the technical solution adopted by the present invention is that: a kind of adaptive blanking coefficient altitudeline clutter suppression
Method processed, the adaptive blanking coefficient altitudeline clutter suppressing method include:
S1: obtaining in the antenna direction diagram of actual measurement, and when primary antenna side lobe gain is higher than protection antenna gain, antenna is corresponding
Antenna parameter A；
S2: the corresponding antenna parameter of present level line clutter incident angle is obtained according to the parameter information of aircraft inertial navigation transmitting
C；
S3: the antenna parameter A number of comparison present level line clutter incident angle corresponding antenna parameter C numerical value and actual measurement
Value then uses new blanking coefficient if the former falls into latter range, and on the contrary then blanking coefficient remains unchanged.
Further, the antenna parameter includes antenna azimuth, pitch angle, beam pointing-angle and working frequency.
Further, the parameter information of the inertial navigation includes climb angle and roll angle.
It further, further include that the body coordinate system of the roll angle that climbs is converted into antenna coordinate system in step S3.
Further, in step S3, present level line clutter is injected angle and is based under the coordinate system of the world.
Further, new blanking coefficient is greater than former blanking coefficient.
Adaptive blanking coefficient altitudeline clutter suppressing method of the invention can inhibit altitudeline clutter pair to greatest extent
The influence of target detection, has the advantages that compared with prior art
(1) adaptive change of sidelobe blanking coefficient can remove altitudeline clutter false-alarm caused by antenna constant error；
(2) related frequency point and beam pointing-angle have just been collected when radar dispatches from the factory, has only been needed when radar works normally
It tables look-up to modify blanking coefficient, and complicated operation is omitted, computing resource is greatly saved and improves efficiency；
(3) it does not need to deduct altitudeline clutter position in frequency spectrum when detection, so not will lead to real goal in height
Missing inspection when near line clutter；
(4) it can be applied to airborne radar and inhibit altitudeline clutter to greatest extent in flight course, reduce the false-alarm of radar
Rate improves the detection performance of radar.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows and meets implementation of the invention
Example, and be used to explain the principle of the present invention together with specification.
Fig. 1 is adaptive blanking coefficient altitudeline clutter suppressing method flow chart of the invention.
Fig. 2 is the actual measurement antenna radiation pattern of one embodiment of the invention；
Fig. 3 be and the radar three-dimensional spectrogram in Fig. 2 when corresponding practical flight；
Fig. 4 is the three-dimensional spectrogram changed after blanking coefficient.
Specific embodiment
To keep the purposes, technical schemes and advantages of the invention implemented clearer, below in conjunction in the embodiment of the present invention
Attached drawing, technical solution in the embodiment of the present invention is further described in more detail.
Radar antenna is the equipment for being used to radiate and receive electromagnetic wave and determine its detection direction in radar.It actually used
Cheng Zhong, radar antenna is since the factors such as different beams center, frequency point and mismachining tolerance can change directional diagram performance, in certain feelings
The practical side lobe gain of primary antenna is caused to be higher than protection antenna under condition.In order to minimize its influence, by changing in software
Blanking coefficient to guarantee that sidelobe echo target will not be regarded indirectly.Since influence most serious in sidelobe echo is exactly altitude line
Cause, therefore forwarding method of the invention changes its blanking coefficient just for altitude line.
Adaptive blanking coefficient altitudeline clutter suppressing method process referring to Fig. 1, in the present invention are as follows:
Actual measurement primary antenna side lobe gain when factory is higher than the corresponding secondary lobe angle of protection antenna and frequency point and wave beam refers to
It is stored to azimuth pitch angle and is put into set A, be denoted as set A (f0,θ0,φ0,θ1,φ1), wherein f0It is working frequency points, θ0It is
Beam position azimuth, φ0It is beam position pitch angle, θ1It is the azimuth that main channel antenna sidelobe gain is more than protection channel,
φ1It is pitch angle.
When radar works normally, the carrier aircraft angle of climb and roll angle information that inertial navigation is transmitted are received, by body coordinate system
Aerial system is changed into, altitudeline clutter incident angle corresponding antenna coordinate system azimuth is calculated and pitch angle is put into set C
(f1,θ4,φ4,θ3,φ3), wherein f1It is working frequency points, θ4It is beam position azimuth, φ4It is beam position pitch angle, θ3It is
Altitudeline clutter is in the azimuth of antenna coordinate system, φ3It is pitch angle.
If the value of C, in set A, radar uses new blanking coefficient value, the value be inversely proportional to main channel performance number and
The difference of channel power is protected, so that blanking coefficient is less than protection antenna multiplied by power after primary antenna echo, thus blanking success.
It should be noted that under normal conditions, the value of blanking coefficient is to increase, i.e., new blanking coefficient is greater than former blanking
Coefficient.
If C value, not in set A, radar blanking coefficient remains unchanged.
In order to more understand the contents of the present invention, the antenna radiation pattern shown in Figure 2 for actual measurement.
Fig. 2 a is that be directed toward angle be 0 degree, when working frequency is 8GHz to beam positional, and solid line is radar primary antenna actual measurement direction
Figure, dotted line are protection antenna actual measurement directional diagrams, it can be seen that all side lobe gains in all primary antenna directional diagrams are below guarantor
Antenna gain is protected, set A is sky；
Fig. 2 b be wave beam pitching be directed toward angle be -15 spend, working frequency is when being 9.7GHz, solid line is radar primary antenna actual measurement side
Xiang Tu, dotted line are protection antenna actual measurement directional diagrams, and main antenna gain is higher than protection antenna gain near -70 degree, at this time set A
(9.7GHZ, θ0, -15 °, θ1, -100 °~-65 °)；
Fig. 2 c be wave beam pitching be directed toward angle be -30 spend, working frequency is when being 9.7GHz, solid line is radar primary antenna actual measurement side
Xiang Tu, dotted line are protection antenna actual measurement directional diagrams, and main antenna gain is higher than protection antenna gain near -50 degree, at this time set A
(9.7GHz, θ0, -30, θ1, -48 °~-41 °)
Fig. 2 d is that be directed toward angle be 0 degree, when working frequency is 9.7GHz for wave beam pitching, and solid line is radar primary antenna actual measurement direction
Figure, dotted line are protection antenna actual measurement directional diagrams, it can be seen that all side lobe gains in all primary antenna directional diagrams are below guarantor
Antenna gain is protected, set A is sky.
Absolutely empty echo spectrum figure corresponding with Fig. 2 shown in Figure 3, since (main lobe is emitted to returning for ground to main clutter
Wave) all range gates are occupied, altitudeline clutter is located near frequency door zero, it can be seen that in some cases, altitudeline clutter
It can be taken as real goal, cause false-alarm.
In Fig. 2 a and Fig. 2 d corresponding with Fig. 3 a and Fig. 3 d, rationally, there is protection antenna the setting of blanking coefficient protection to make
With, therefore altitudeline clutter is not detected, is not caused empty quiet.
And in Fig. 2 b and Fig. 2 c corresponding with Fig. 3 b and Fig. 3 c, the setting of blanking coefficient is unreasonable, and protection antenna does not play guarantor
The effect of shield, therefore altitudeline clutter is detected, and is caused empty quiet.By taking the absolutely empty echo spectrum figure in Fig. 3 b as an example, pass through
It is -80 °~-90 ° that aircraft inertial navigation, which obtains the corresponding antenna elevation angle of present level line clutter incident angle, is fallen at this time such as set A
In, therefore former blanking coefficient 1 has been increased to 1.1.After by the above process, in subsequent detection, altitudeline clutter is by mistake
Filter, as shown in Figure 4.
By above-mentioned steps, the method for the present invention can inhibit altitudeline clutter to greatest extent, reduce carrier aircraft in practical examination
False alarm rate during flying, improves the detection system energy of radar.
Adaptive blanking coefficient altitudeline clutter suppressing method of the invention can inhibit altitudeline clutter pair to greatest extent
The influence of target detection, has the advantages that compared with prior art
(1) adaptive change of sidelobe blanking coefficient can remove altitudeline clutter false-alarm caused by antenna constant error；
(2) related frequency point and beam pointing-angle have just been collected when radar dispatches from the factory, has only been needed when radar works normally
It tables look-up to modify blanking coefficient, and complicated operation is omitted, computing resource is greatly saved and improves efficiency；
(3) it does not need to deduct altitudeline clutter position in frequency spectrum when detection, so not will lead to real goal in height
Missing inspection when near line clutter；
(4) it can be applied to airborne radar and inhibit altitudeline clutter to greatest extent in flight course, reduce the false-alarm of radar
Rate improves the detection performance of radar.
The above, optimal specific embodiment only of the invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of the claim
Subject to enclosing.
Claims (6)
1. a kind of adaptive blanking coefficient altitudeline clutter suppressing method, which is characterized in that the adaptive blanking coefficient height
Line clutter suppression method includes:
S1: obtaining in the antenna direction diagram of actual measurement, when primary antenna side lobe gain is higher than protection antenna gain, the corresponding antenna of antenna
Parameter A；
S2: the corresponding antenna parameter C of present level line clutter incident angle is obtained according to the parameter information of aircraft inertial navigation transmitting；
S3: the antenna parameter A numerical value of comparison present level line clutter incident angle corresponding antenna parameter C numerical value and actual measurement, such as
The former falls into latter range, then uses new blanking coefficient, and on the contrary then blanking coefficient remains unchanged.
2. adaptive blanking coefficient altitudeline clutter suppressing method according to claim 1, which is characterized in that the antenna
Parameter includes antenna azimuth, pitch angle, beam pointing-angle and working frequency.
3. adaptive blanking coefficient altitudeline clutter suppressing method according to claim 1, which is characterized in that the inertial navigation
Parameter information include climbing angle and roll angle.
4. adaptive blanking coefficient altitudeline clutter suppressing method according to claim 1, which is characterized in that step S3
In, it further include that the body coordinate system of the roll angle that climbs is converted into antenna coordinate system.
5. adaptive blanking coefficient altitudeline clutter suppressing method according to claim 3, which is characterized in that step S3
In, present level line clutter is injected angle and is based under the coordinate system of the world.
6. adaptive blanking coefficient altitudeline clutter suppressing method according to claim 1, which is characterized in that new blanking
Coefficient is greater than former blanking coefficient.
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| CN201810897281.3A CN109031232B (en) | 2018-08-08 | 2018-08-08 | Adaptive masking coefficient height line clutter suppression method |
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| CN201810897281.3A CN109031232B (en) | 2018-08-08 | 2018-08-08 | Adaptive masking coefficient height line clutter suppression method |
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| CN110618411A (en) * | 2019-10-23 | 2019-12-27 | 电子科技大学 | Airborne radar clutter real-time signal generation method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110618411B (en) * | 2019-10-23 | 2022-11-04 | 电子科技大学 | Airborne radar clutter real-time signal generation method |
| CN111044971A (en) * | 2019-12-23 | 2020-04-21 | 南京长峰航天电子科技有限公司 | Two-dimensional interferometer direction finding system |
| CN111044971B (en) * | 2019-12-23 | 2022-07-01 | 南京长峰航天电子科技有限公司 | Two-dimensional interferometer direction finding system |
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