CN109459737A - A kind of clutter suppression method based on dynamic distance door - Google Patents
A kind of clutter suppression method based on dynamic distance door Download PDFInfo
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- CN109459737A CN109459737A CN201910007134.9A CN201910007134A CN109459737A CN 109459737 A CN109459737 A CN 109459737A CN 201910007134 A CN201910007134 A CN 201910007134A CN 109459737 A CN109459737 A CN 109459737A
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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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- Engineering & Computer Science (AREA)
- 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 clutter suppression methods based on dynamic distance door, comprising: determines range gate of the target under the default viewing directional angle according to projector distance of the target on radar line of sight under default viewing directional angle；According to one-dimensional range profile data of the echo signal form target of target under the default viewing directional angle, the data in the one-dimensional range profile data not in the range gate are curbed to obtain effective one-dimensional range profile data；Effective echo-signal of target is generated according to effective one-dimensional range profile data.The present invention can be dynamically determined the range gate of target under each viewing directional angle, interfered based on dynamic distance door clutter reduction, improve the efficiency of clutter recognition.
Description
Technical field
The present invention relates to radar target signature technical field more particularly to a kind of clutter recognition sides based on dynamic distance door
Method.
Background technique
The electromagnetic scattering of optics area radar target shows as the synthesis of electromagnetic scattering on the certain local locations of target, these offices
The scattering source of portion's property typically occurs within the geometric shape size of target.When obtaining the test data of target, background clutter
Often enter in test signal, target truthful data is interfered, it, can be with for appearing in the clutter except target size
It is curbed by the method for range gate.
Purpose using range gate be by range gate signal retain, by outside range gate signal inhibit, it is common away from
It is a fixed value, the generally higher than maximum value of target overall dimensions from door, doing so can make range gate sufficiently large, avoid
The actual signal of target is also given and is curbed.But doing so also has its disadvantage, be exactly cannot clutter reduction as much as possible, in difference
Viewing directional angle under, target be apart from upward projection it is continually changing, under certain angles can very little, if still using solid
Fixed range gate has considerable clutter and is mixed into echo signal, interferes.
Therefore, a kind of range gate that is able to solve is needed to choose clutter that is improper and causing except multiple target in the prior art
Interfere the scheme of actual signal.
Summary of the invention
In order to solve the above-mentioned technical problems, the present invention provides a kind of clutter suppression method based on dynamic distance door, energy
It is enough dynamically determined the range gate of target under each viewing directional angle, is interfered based on dynamic distance door clutter reduction, improves clutter recognition
Efficiency.
Clutter suppression method according to the present invention based on dynamic distance door, comprising:
Determine target under the default viewing directional angle according to projector distance of the target on radar line of sight under default viewing directional angle
Range gate；
According to one-dimensional range profile data of the echo signal form target of target under the default viewing directional angle, by described one
Data in dimension Range Profile data not in the range gate are curbed to obtain effective one-dimensional range profile data；
Effective echo-signal of target is generated according to effective one-dimensional range profile data.
Optionally, determine target in the default view according to projector distance of the target on radar line of sight under default viewing directional angle
Range gate under to angle, comprising:
Projector distance of each scattering center on radar line of sight in target under the default viewing directional angle of acquisition, according to the projection
The maxima and minima of distance determines range gate of the target under the default viewing directional angle.
Optionally, the viewing directional angle includes: pitching viewing directional angle and orientation viewing directional angle；Throwing of the scattering center on radar line of sight
Shadow distance are as follows:
R (θ, φ)=x (φ) sin θ cos φ+y (φ) sin θ sin φ+z (φ) cos θ,
In formula, R (θ, φ) represents projector distance of the scattering center on radar line of sight, and θ, φ are respectively radar line of sight in mesh
The pitching viewing directional angle and orientation viewing directional angle in body coordinate system are marked, (x, y, z) is scattering center in target body coordinate system
Coordinate.
Optionally, determine target in the default view according to projector distance of the target on radar line of sight under default viewing directional angle
Range gate under to angle, comprising:
One polyhedron comprising target of construction；
Determine projector distance of the polyhedral each vertex under the default viewing directional angle on radar line of sight；
By the maximum of projector distance of the polyhedral each vertex under the default viewing directional angle on radar line of sight
Value and range gate of the minimum value as target under the default viewing directional angle.
Optionally, the polyhedron is cube.
Above-mentioned technical proposal of the invention has the advantages that the present invention according to target under default viewing directional angle in radar line of sight
On projector distance determine range gate of the target under the default viewing directional angle, target under each viewing directional angle can be dynamically determined
Range gate is interfered based on dynamic distance door clutter reduction, improves the efficiency of clutter recognition.
Detailed description of the invention
Fig. 1 is to show the clutter suppression method schematic diagram according to the present invention based on dynamic distance door；
Fig. 2 is schematic diagram of the fixed range gate in different viewing directional angles for showing the prior art；
Fig. 3 is to show the dynamic distance door schematic diagram of the invention under different viewing directional angles；
Fig. 4 is clutter suppression of the fixed range gate under 60 ° of pitching viewing directional angles, 70 ° of orientation viewing directional angles according to prior art
Schematic diagram processed；
Fig. 5 is clutter recognition of the dynamic distance door according to the present invention under 60 ° of pitching viewing directional angles, 70 ° of orientation viewing directional angles
Schematic diagram；
Fig. 6 clutter recognition of the fixed range gate under 60 ° of pitching viewing directional angles, 90 ° of orientation viewing directional angles according to prior art
Schematic diagram；
Fig. 7 is clutter recognition of the dynamic distance door according to the present invention under 60 ° of pitching viewing directional angles, 90 ° of orientation viewing directional angles
Schematic diagram；
Fig. 8 be according to prior art the echo signal after fixed range gate clutter reduction in 60 ° of pitching viewing directional angles, 70 °
Two-dimensional image under orientation viewing directional angle；
Fig. 9 is echo signal after dynamic distance door clutter reduction according to the present invention in 60 ° of pitching viewing directional angles, 70 ° of sides
Two-dimensional image under the viewing directional angle of position；
Figure 10 be according to prior art the echo signal after fixed range gate clutter reduction in 60 ° of pitching viewing directional angles, 90 °
Two-dimensional image under orientation viewing directional angle；
Figure 11 is echo signal after dynamic distance door clutter reduction according to the present invention in 60 ° of pitching viewing directional angles, 90 ° of sides
Two-dimensional image under the viewing directional angle of position；
In each view, azimuth represents orientation viewing directional angle, and dross range represents range gate, and amplitude is represented
Amplitude, down range represent two-dimensional image in the distance in radar ray direction, and cross range represents two-dimensional image in vertical radar
The distance of directions of rays.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Currently, the clutter suppression method of test data has the following problems: common range gate is a fixed value, one
As be greater than target shape size maximum value, doing so can make range gate sufficiently large, avoid being pressed down the actual signal of target
System is fallen.Fig. 2 is schematic diagram of the fixed range gate in different viewing directional angles for showing the prior art.With the variation of viewing directional angle, distance
The value of door immobilizes, i.e., is interfered under each viewing directional angle using identical range gate clutter reduction.But doing so also has it to lack
Point, being exactly cannot clutter reduction as much as possible.Under different viewing directional angles, projector distance of the target on radar line of sight is continuous
Variation, the meeting very little under certain viewing directional angles, if still having considerable clutter using fixed range gate and being mixed into target
Signal interferes.
For the defects in the prior art, the present invention is directed to propose a kind of clutter suppression method based on dynamic distance door,
To improve the efficiency of clutter reduction.
Fig. 1 is to show the clutter suppression method schematic diagram according to the present invention based on dynamic distance door.As shown in Figure 1, this
Invention the clutter suppression method based on dynamic distance door include:
Step S101, determine target described default according to projector distance of the target on radar line of sight under default viewing directional angle
Range gate under viewing directional angle；
Step S102, the one-dimensional range profile number according to the echo signal form target of target under the default viewing directional angle
According to the data in the one-dimensional range profile data not in the range gate being curbed to obtain effective one-dimensional range profile number
According to；
Step S103, effective echo-signal of target is generated according to effective one-dimensional range profile data.
The present invention determines target in the default view according to projector distance of the target on radar line of sight under default viewing directional angle
Range gate under to angle can be dynamically determined the range gate of target under each viewing directional angle；It is dry based on dynamic distance door clutter reduction
It disturbs, data of the target in the one-dimensional range profile data under default viewing directional angle not in the range gate is curbed, such echo
Clutter recognition only is improved to inhibit invalid noise signal comprising the useful signal in target shape size in signal
Efficiency.
In some embodiments, determine target in institute according to projector distance of the target on radar line of sight under default viewing directional angle
The range gate under default viewing directional angle is stated, may include: to obtain under default viewing directional angle in target each scattering center in radar line of sight
On projector distance, distance of the target under the default viewing directional angle is determined according to the maxima and minima of the projector distance
Door.It is dynamically determined range gate of the target under each viewing directional angle by the maxima and minima of projector distance, is simple and efficient.
In further embodiments, determine that target exists according to projector distance of the target on radar line of sight under default viewing directional angle
Range gate under the default viewing directional angle may include: to construct the polyhedron comprising target；It determines described polyhedral each
Projector distance of a vertex under the default viewing directional angle on radar line of sight；By polyhedral each vertex described pre-
If the maxima and minima of the projector distance under viewing directional angle on radar line of sight is as target under the default viewing directional angle
Range gate.
When the quantity of scattering center in target is more, if calculating separately projection of each scattering center on radar line of sight
Distance it is computationally intensive.In the present embodiment, according to polyhedral each vertex of construction in radar line of sight under default viewing directional angle
On projector distance determine the range gate of target, need to only calculate the projector distance on polyhedral each vertex, calculation amount subtracts significantly
It is small.
Polyhedral specific configuration can carry out selective setting, such as tetrahedron, hexahedron, octahedral according to the actual situation
Body etc..Optionally, polyhedron is cube.
For example, determining target in the default visual direction according to projector distance of the target on radar line of sight under default viewing directional angle
Range gate under angle includes
According to the overall dimensions of target: length constitutes the cube comprising target, and the target is i.e. herein
In the cube of construction；
Calculate separately out projection of 8 vertex of the cube constructed under a certain viewing directional angle on radar line of sight away from
From by the vector of projector distance composition one 8 dimension of 8 vertex of this cube under some viewing directional angle on radar line of sight；
8 dimensional vectors can be constructed under each viewing directional angle, the minimum value and maximum value of this vector are that target exists
Range gate under this viewing directional angle.It, will be each because the minimum value and maximum value of 8 dimensional vectors are dynamic changes under each viewing directional angle
Range gate under viewing directional angle combines, and is exactly the dynamic distance door model under different viewing directional angles.It is with 60 ° of pitching viewing directional angle
Example, dynamic distance door model is referring to Fig. 3, and the value of range gate is dynamic change under each orientation viewing directional angle, in orientation
Reach maximum value at 0 °, 180 ° of viewing directional angle, reaches minimum value at -90 °, 90 ° of orientation viewing directional angle.
Viewing directional angle includes: pitching viewing directional angle and orientation viewing directional angle.Projector distance of the scattering center on radar line of sight can be with
Are as follows:
R (θ, φ)=x (φ) sin θ cos φ+y (φ) sin θ sin φ+z (φ) cos θ,
In formula, R (θ, φ) represents projector distance of the scattering center on radar line of sight, and θ, φ are respectively radar line of sight in mesh
The pitching viewing directional angle and orientation viewing directional angle in body coordinate system are marked, (x, y, z) is scattering center in target body coordinate system
Coordinate.
By taking 60 ° of pitching viewing directional angle, 70 ° of orientation viewing directional angle as an example, according to the fixed range gate of the prior art, inhibit miscellaneous
Referring to fig. 4, using dynamic distance door of the invention, the process of clutter reduction is referring to Fig. 5 for the process of wave；
By taking 60 ° of pitching viewing directional angle, 90 ° of orientation viewing directional angle as an example, according to the fixed range gate of the prior art, inhibit miscellaneous
The process of wave is referring to Fig. 6；Using dynamic distance door of the invention, the process of clutter reduction is referring to Fig. 7.
By taking 60 ° of pitching viewing directional angle, 70 ° of orientation viewing directional angle as an example, according to the fixed range gate of the prior art, inhibit miscellaneous
Signal after wave extra scattering point can occur, referring to Fig. 8 when at two-dimensional image except target；Using dynamic of the invention
When at two-dimensional image these extra scattering points have effectively been discharged, referring to Fig. 9 in range gate, the signal after clutter reduction.
By taking 60 ° of pitching viewing directional angle, 90 ° of orientation viewing directional angle as an example, according to the fixed range gate of the prior art, inhibit miscellaneous
Signal after wave extra scattering point can occur, referring to Figure 10 when at two-dimensional image except target；Using dynamic of the invention
When at two-dimensional image these extra scattering points have effectively been discharged, referring to Figure 11 in range gate, the signal after clutter reduction.
This signal effectively prevents the interference of clutter in application later, compares fixed range gate and dynamic distance door
Two-dimensional image after clutter reduction, it can be seen that advantages of the present invention.
In conclusion the clutter suppression method according to the present invention based on dynamic distance door, without requiring range gate to be solid
Determine size, dynamic distance door can more effectively inhibit the interference of clutter, improve the efficiency of clutter recognition.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (5)
1. a kind of clutter suppression method based on dynamic distance door characterized by comprising
According to projector distance of the target on radar line of sight under default viewing directional angle determine target under the default viewing directional angle away from
From door；
According to one-dimensional range profile data of the echo signal form target of target under the default viewing directional angle, by it is described it is one-dimensional away from
It curbs from as the data in data not in the range gate to obtain effective one-dimensional range profile data；
Effective echo-signal of target is generated according to effective one-dimensional range profile data.
2. clutter suppression method according to claim 1, which is characterized in that regarded according to target under default viewing directional angle in radar
Projector distance on line determines range gate of the target under the default viewing directional angle, comprising:
Projector distance of each scattering center on radar line of sight in target under the default viewing directional angle of acquisition, according to the projector distance
Maxima and minima determine range gate of the target under the default viewing directional angle.
3. clutter suppression method according to claim 2, which is characterized in that the viewing directional angle include: pitching viewing directional angle and
Orientation viewing directional angle；Projector distance of the scattering center on radar line of sight are as follows:
R (θ, φ)=x (φ) sin θ cos φ+y (φ) sin θ sin φ+z (φ) cos θ,
In formula, R (θ, φ) represents projector distance of the scattering center on radar line of sight, and θ, φ are respectively radar line of sight in target sheet
Pitching viewing directional angle and orientation viewing directional angle in body coordinate system, (x, y, z) are coordinate of the scattering center in target body coordinate system.
4. clutter suppression method according to claim 3, which is characterized in that regarded according to target under default viewing directional angle in radar
Projector distance on line determines range gate of the target under the default viewing directional angle, comprising:
One polyhedron comprising target of construction；
Determine projector distance of the polyhedral each vertex under the default viewing directional angle on radar line of sight；
By the maximum value of projector distance of the polyhedral each vertex under the default viewing directional angle on radar line of sight with
Range gate of the minimum value as target under the default viewing directional angle.
5. clutter suppression method according to claim 4, which is characterized in that the polyhedron is cube.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910007134.9A CN109459737A (en) | 2019-01-04 | 2019-01-04 | A kind of clutter suppression method based on dynamic distance door |
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| CN201910007134.9A CN109459737A (en) | 2019-01-04 | 2019-01-04 | A kind of clutter suppression method based on dynamic distance door |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110061790A (en) * | 2019-04-03 | 2019-07-26 | 北京环境特性研究所 | Inhibit the method for radio frequency interference in a kind of frequency sweep RCS test |
| CN111123269A (en) * | 2019-12-30 | 2020-05-08 | 成都纳雷科技有限公司 | Ground clutter suppression method, module and device for unmanned aerial vehicle obstacle avoidance radar |
-
2019
- 2019-01-04 CN CN201910007134.9A patent/CN109459737A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110061790A (en) * | 2019-04-03 | 2019-07-26 | 北京环境特性研究所 | Inhibit the method for radio frequency interference in a kind of frequency sweep RCS test |
| CN110061790B (en) * | 2019-04-03 | 2021-07-09 | 北京环境特性研究所 | Method for inhibiting radio frequency interference in sweep frequency RCS test |
| CN111123269A (en) * | 2019-12-30 | 2020-05-08 | 成都纳雷科技有限公司 | Ground clutter suppression method, module and device for unmanned aerial vehicle obstacle avoidance radar |
| CN111123269B (en) * | 2019-12-30 | 2022-02-18 | 成都纳雷科技有限公司 | Ground clutter suppression method, module and device for unmanned aerial vehicle obstacle avoidance radar |
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