CN104569937B - A kind of new synthetic aperture radar corner reflector and its design method - Google Patents
A kind of new synthetic aperture radar corner reflector and its design method Download PDFInfo
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- CN104569937B CN104569937B CN201510042788.7A CN201510042788A CN104569937B CN 104569937 B CN104569937 B CN 104569937B CN 201510042788 A CN201510042788 A CN 201510042788A CN 104569937 B CN104569937 B CN 104569937B
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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
- G01S7/40—Means for monitoring or calibrating
Abstract
A kind of design method of new synthetic aperture radar corner reflector, comprises the following steps：Using input parameters such as radar system parameters, scaling requirements, trihedral corner reflector reflection plate suqare is calculated；According to reflecting plate boundary curve citation form, calculate area and be equal toCandidate edge curve form, that is,；According to candidateWithNumerical value pair, calculate corresponding minimum edge length；It is determined that the boundary curve of whole reflecting plate.The present invention is directed to conventional trihedral corner reflector corner ground clutter interference problem, and using the reflecting plate of full-reflector type, that is, all radar waves that corner reflector is exposed to along normal direction can return to radar after triple reflection；Secondly the problem of being also easy to produce reflecting plate edge diffraction for Low-frequency radar ripple, the reflection plate shape of optimization design trihedral corner reflector, so that the edge length of reflecting surface is most short in given reflection plate suqare lower edge length, so as to improve corner reflector applied to the calibration of SAR load and the precision of image quality measure.
Description
Technical field
The present invention relates to SAR remote sensing field, is related to a kind of new synthetic aperture radar corner reflector design side
Method, it is that a kind of elimination corner reflector clutter influences and minimizes the new synthetic aperture radar corner reflection of reflecting plate edge length
Device design method.The inventive method principle is simple, convenience of calculation, is commented available for synthetic aperture radar high accuracy Scaling with quality
Valency.
Background technology
As the development of synthetic aperture radar (SAR) satellite remote sensing technology and the round-the-clock quantitative remote sensing application of round-the-clock need
The continuous growth asked, in-orbit high accuracy Scaling is carried out to SAR, the importance of image quality evaluation becomes increasingly conspicuous.SAR is calibrated and figure
Picture quality evaluation generally use corner reflector is carried out as point target, lays corner reflector at test site first, and it is anti-to obtain angle
The SAR image of emitter；Corner reflector shows as " point " target with two-dimentional sinc function shapes in SAR image, in cross
Shape, the resolution ratio of halfwidth (3dB pulsewidths) evaluation image of the main lobe power by calculating the point target；Reflected by trihedral angle
The theoretical radar cross section (RCS) of device obtains radar cross section with measurement and determines calibration coefficient, and evaluation Electrodynamic radiation etc. is respectively
Item quality index.
Trihedral corner reflector is the most widely used a kind of SAR corner reflectors.Trihedral corner reflector common at present is anti-
Penetrating plate shape has isosceles right triangle, square, 1/4 circular arc etc..
Major technique defect：
(1) calibration of SAR load and image quality evaluation be by the theoretical RCS values of corner reflector and its in SAR image
Brightness value contrasted so as to obtain calibration coefficient；Image is determined by the point target impulse response of corner reflector in the picture
Quality index.In actual applications, corner reflector reflecting plate will produce " radar-earth's surface-trihedral angle reflection with background environment
The Multiple Scattering effect of device-radar " or " radar-trihedral corner reflector-earth's surface-radar ".It is caused if ground is strong reflection face
Extra RCS errors will be up to 16%.For high radiation calibration accuracy requirement, above-mentioned error is difficult to receive.
2) during corner reflector reflection radar wave, in reflecting plate marginal existence radar wave diffraction effect, this phenomenon pair
Become apparent in Low-frequency radar ripple.The effect will make the RCS values that actually obtain and deviation occurs for theoretical RCS values, and then reduce SAR
The precision of calibration and image quality evaluation.Edge diffraction is directly proportional to edge length, according to isoperimetric theorem, existing three face
For the edge length of corner reflector under given reflection plate suqare, girth is not most short, thus can not optimally suppress edge around
Penetrate the influence of effect.
The content of the invention
The present invention provides a kind of new synthetic aperture radar corner reflector and its design method, is made by the new design
Ground clutter influence and edge diffraction influence can preferably be suppressed by obtaining corner reflector.
The present invention is directed to conventional trihedral corner reflector corner clutter problem, using the reflection of full-reflector reflector type
Plate, that is, all radar waves for exposing to one reflecting plate of corner reflector can return to radar (no by another reflecting plate
There is a situation where to return radar by ground return)；Secondly the problem of being also easy to produce edge diffraction for Low-frequency radar ripple, optimization design
The reflection plate shape of trihedral corner reflector so that the edge length of reflecting surface is most short in given reflection plate suqare lower edge length,
So as to improve corner reflector applied to the calibration of SAR load and the precision of image quality measure.
It can be seen from the above technical proposal that the invention has the advantages that：
(1) as a result of full symmetrical configuration, corner reflector influenceed by Land-oceanic clutters it is small, to lay environment requirement it is low；
(2) edge length under equal corner reflector reflection plate suqare is smaller, RCS precision small by radar wave diffraction effect
It is high；
(3) utilization rate of reflecting plate sheet material is high.
Brief description of the drawings
Fig. 1 is the flow chart of the inventive method；
Fig. 2 is corner reflector reflecting plate boundary curve general expression of the present invention；
Fig. 3 is C1For the reflecting plate schematic diagram of straight line；
Fig. 4 is C1For the reflecting plate schematic diagram of elliptic arc；
Fig. 5 is C1For the reflecting plate schematic diagram of circular arc；
Circular arc reflecting plate length of side L when Fig. 6 is different ribs long l；
Fig. 7 is the dimensional structure diagram using a kind of trihedral corner reflector of design method of the present invention design.
Embodiment
As shown in figure 1, the design method of the present invention comprises the following steps that：
A) using input parameters such as radar system parameters, scaling requirements, trihedral corner reflector reflection plate suqare A is calculated0；
B) according to trihedral corner reflector reflecting plate basic configuration, calculate area and be equal to A0Candidate edge parameter of curve,
That is, (y0,l)i；
C) according to candidate y0With l numerical value to (y0,l)i, calculate corresponding trihedral corner reflector reflecting plate minimum edge length
Spend Lmin；
D the boundary curve parameter of whole reflecting plate) is determined.
Describe in detail as follows：
Step A：Inputted using radar system parameters (such as radar wavelength), scaling requirements (such as signal to noise ratio, calibration precision)
Parameter, calculate trihedral corner reflector reflection plate suqare A0.It is to ensure the RCS of corner reflector to calculate trihedral corner reflector area
Be worth sufficiently large so that it is guaranteed that corner reflector can be visible in radar image, at the same avoid corner reflection reflected intensity it is too high cause it is full
With.
Wherein
S in formula1It is to meet the signal to noise ratio that given measuring uncertainty requires, such as S1During=14dB, measuring uncertainty is
+ 0.9dB arrives -0.8dB, works as S1During=20dB, measuring uncertainty is that+0.4dB arrives -0.4dB；S2For radar system dynamic range
Higher limit, σ are corner reflector peak value RCS values, ρaAnd ρrIt is SAR load orientation and distance to resolution ratio；λ is radar center ripple
It is long；σ0For ground backscattering coefficient.For the corner reflector for airborne synthetic aperture radar calibration and quality evaluation, take full
The larger A of sufficient formula (1)0Value.
Step B：According to reflecting plate boundary curve citation form, as shown in figure 1, by a kind of traversal mode, calculating is appeared
Product is equal to A0All candidate edge curve forms.Comprise the steps of：
B1, selection reflecting plate curve C1Curve form：
If selecting straight line, it is easy to develop processing as shown in figure 3, advantage is that structure is relatively easy, but same area can not be obtained
Under shorter edge length, expression formula is
If selecting elliptic arc, it is not easy to develop processing as shown in figure 4, advantage is that structure is relative complex, but can obtain coplanar
Shorter edge length under product, expression formula are
If circular arc is selected, as shown in figure 5, advantage and disadvantage, between above two shape, expression formula is
B2, according to selected reflecting plate basic configuration and corresponding boundary curve C1Expression formula, y is traveled through by one kind0
With l value methods, the reflection plate suqare A under respective value is calculated respectivelyc。
Ac=2 ∫ (f1′g1-g′1f1)dτ (5)
In formula ' represent derivative.
B3, the candidate y for meeting to require according to formula (6) determination0With l values：
|Ac-A0| ＜ e (6)
E represents threshold value, value 0.0001 in formula.
Step C：According to candidate y0With l numerical value pair, corresponding minimum edge length is calculated, is comprised the steps of：
C1, each y calculated according to following formula0With reflecting plate the edge length L, edge length L of l numerical value pairiWith liRelation such as
Shown in Fig. 6.
C2, the L from calculatingiIn obtain minimum value, then obtain corresponding y0With l numerical value, so as to be met the edge of requirement
Curve C1。
Step D：Curve C is determined according to formula (8)2, and then according to C1And C2The shape of whole reflecting plate is determined on Z=X mirror images
Shape.
C2(τ)=[0, g1(τ),g1(τ)-f1(τ)] (8)
It is using a kind of dimensional structure diagram of trihedral corner reflector of above-mentioned design method design, bag referring to Fig. 7
Support 2 and three reflecting plates 1 are included, three reflecting plates 1 are provided with a right angle, and the right-angle side of three reflecting plates 1 is connected with each other composition
Three faces right angle, it is connected with the top of support 2 below one of reflecting plate 1.The other parts at three edges of reflecting plate 1 are served as reasons
Curve C1With curve C2The A1 parts of connecting line composition, and be made up of A1 parts with A2 parts two parts of diagonal mirror images.
S1 is 20dB, S2 45dB, ground backscattering coefficient 5dB/m2 in the embodiment；ρaAnd ρrFor 1m；λ is
5.5cm.According to formula (1), A0 is obtained as 0.9.Consideration takes into account development and edge length, selects basic configuration of the edge for circular arc,
Such as formula (4), according to step B and C, it may be determined that l 0.8962m, as shown in Figure 7.Support 2 is prior art, and having to adjust
Save the function in inclination angle and direction.
Claims (2)
1. a kind of design method of new synthetic aperture radar corner reflector, it is characterised in that comprise the following steps：
A, using radar system parameters, scaling requirements input parameter, trihedral corner reflector reflection plate suqare A is calculated0；
B, according to trihedral corner reflector reflecting plate basic configuration, calculate area and be equal to A0Candidate edge parameter of curve, that is,
(y0,l)i；
C, according to candidate y0With l numerical value to (y0,l)i, calculate the minimum edge length of corresponding trihedral corner reflector reflecting plate
Lmin；
D, the boundary curve parameter of whole reflecting plate is determined；
Trihedral corner reflector reflection plate suqare A in described step A0Calculated according to formula (1)：
Wherein
S in formula1It is the signal to noise ratio for meeting given measuring uncertainty requirement, works as S1During=14dB, measuring uncertainty is+0.9dB
To -0.8dB；Work as S1During=20dB, measuring uncertainty is that+0.4dB arrives -0.4dB；S2For polarization sensitive synthetic aperture radar system dynamic model
Place limit value, σ is corner reflector peak value RCS values, ρaAnd ρrIt is synthetic aperture radar orientation and distance to resolution ratio；λ is radar
Centre wavelength；σ0For the backscattering coefficient on ground；It is anti-with the angle of quality evaluation for being calibrated for airborne synthetic aperture radar
Emitter, take the larger A for meeting formula (1)0Value；
Described step B：According to reflecting plate boundary curve citation form, by a kind of traversal mode, calculate area and be equal to A0's
All candidate edge curve forms, are comprised the steps of：
B1, selection trihedral corner reflector reflecting plate basic configuration, that is, determine its boundary curve C1Form：
If selecting straight line, expression formula is：
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Value method, calculate corresponding reflection plate suqare Ac；
Ac=2 ∫ (f1′g1-g1′f1)dτ (5)
In formula ' represent derivative；
B3, the candidate y for meeting to require according to formula (6) determination0With l values：
|Ac-A0| ＜ e (6)
E represents threshold value, value 0.0001 in formula；
Described step C：According to candidate y0With l numerical value pair, corresponding minimum edge length is calculated, is comprised the steps of：
C1, each y calculated according to following formula0With reflecting plate the edge length L, edge length L of l numerical value pairiWith liRelational expression be：
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C2, the L from calculatingiIn obtain minimum value, then obtain corresponding y0With l numerical value, so as to be met the boundary curve of requirement
C1；
Described step D：Curve C is determined according to formula (8)2：
C2(τ)=[0, g1(τ),g1(τ)-f1(τ)] (8)
And then according to C1And C2The shape of whole reflecting plate is determined on Z=X mirror images.
A kind of 2. new synthetic aperture radar corner reflector that design method using described in claim 1 designs.
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| CN105629208B (en) * | 2016-01-08 | 2018-09-18 | 中国人民解放军国防科学技术大学 | A kind of synthetic aperture radar two dimensional image modulator based on phase-modulation surface |
| CN108594191B (en) * | 2018-04-24 | 2020-03-17 | 北京环境特性研究所 | Three-sided corner reflector, method and device for determining semi-elliptical concave structure |
| CN109459736B (en) * | 2019-01-04 | 2020-10-13 | 北京环境特性研究所 | Radar target design method and device |
| CN110118968B (en) * | 2019-04-30 | 2021-01-05 | 华中科技大学 | Inclined four-reflecting-plate mirror image synthetic aperture radiometer and imaging method |
| CN112444783A (en) * | 2019-09-05 | 2021-03-05 | 中国科学院光电研究院 | Synthetic aperture radar on-orbit rapid calibration method based on natural uniform target |
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