CN106556819A - Low Scattering Targets support of terahertz wave band and preparation method thereof - Google Patents
Low Scattering Targets support of terahertz wave band and preparation method thereof Download PDFInfo
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- CN106556819A CN106556819A CN201610957290.8A CN201610957290A CN106556819A CN 106556819 A CN106556819 A CN 106556819A CN 201610957290 A CN201610957290 A CN 201610957290A CN 106556819 A CN106556819 A CN 106556819A
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- metal pylon
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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
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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
- G01S7/023—Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Aerials With Secondary Devices (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a kind of low Scattering Targets support of terahertz wave band, comprises the steps of：Determine the material and shape of initial fabrication Metal pylon；By simulation calculation, Metal pylon surface maximum mismachining tolerance and reflectivity error relationship model are obtained；According to the material and shape of the initial fabrication Metal pylon for determining, corresponding Metal pylon model is made；Reflectance test is carried out to Metal pylon model using terahertz time-domain spectroscopy system, the reflectivity and Terahertz frequency relation figure of Metal pylon model is obtained；Interpretation of result is carried out to the reflectivity and Terahertz frequency relation figure of Metal pylon model, it is determined that finally making the material and shape of Metal pylon.The preparation method of the present invention is simple, and the material of making has relatively low reflectivity in terahertz wave band, and Metal pylon Surface Machining roughness meets measurement request, and Metal pylon reflection very little solves the problems, such as that THz wave wave band Electromagnetic Scattering of Target test target is supported.
Description
Technical field
The present invention relates to radar target signature technical field of measurement and test, and in particular to a kind of low Scattering Targets of terahertz wave band
Frame and preparation method thereof.
Background technology
In the electromagnetic scatterings such as target radar scattering cross-section (RCS), dispersion image measurement, Metal pylon is most important setting
It is one of standby, and one of the main background clutter source in targeted test region, due to Metal pylon reasons for its use clutter when
Between it is upper and apart from upper identical with measured target electromagnetic scattering echo, it is difficult with hardware range gate and software disappear apart from gate technique
Remove, generally eliminated the effects of the act using background clutter vector washout technology, but background vector cancellation technology cannot eliminate Metal pylon with
Measured target coupling clutter affects, therefore, usually requiring that Metal pylon possesses low scattering property in itself, the RCS of itself must
Very little, and possess certain azimuth stabilization, i.e. RCS with Orientation differences very little, support is little with the interaction of target.
The most frequently used Metal pylon form of microwave frequency band has sphenoid (cross section is almond-shaped, as shown in Figure 1), circular cone
Shape, cylindrical stent, wherein sphenoid are metallic support, and cone, cylindrical stent are essentially foamed material.Tanghai is just, slowly
The paper that long queue, Xu get Ming were delivered in microwave journal in 2000《A kind of design and analysis of new Metal pylon》In, to ovum
At the top of shape metallic support, the field structure of lower section is analyzed, it is proposed that a kind of new Metal pylon, and the main part of support is
One front and rear edges is towards incident wave tilt and upper section area is less than the avette post of lower section area, similar to sphenoid；Tang
Know the paper that bright, Li En, Li Huajun et al. are delivered for 2010 in microwave journal《Plastic target support RCS is imitated using FEKO
It is true to study》In, using Ansys companies Feko softwares to various shapes such as single circular cone, multistage cylinder, multi-level cone, pyramid cylinders
Shape, the Metal pylon of different materials have carried out RCS simulation calculation, give the simulation result of 2GHz～18GHz,
The single circular cone manufactured with polystyrene foam plastics and the scattering of pyramid conical stent are minimum.Publication No. CN201107406Y
Chinese patent literature disclose a kind of low RCS tests metallic support, the cross section of designed metallic support is in almond-shaped, the back of the body
It is the symmetrical arc in both sides to the side of direction of illumination, it is adaptable to low RCS tests；The China of Publication No. CN102967774A is specially
Sharp document discloses a kind of low radar scattering cross section metallic support total scattering field computation method, installs one additional by metallic support top
The individual low scattering metal end caps through reasonable configuration design, and metal is filtered from scattered field of the metallic support with end cap assembly
The scattered field of end cap, obtains the scattered field of metallic support, and the RCS accurate measurements for final goal provide guarantee；Publication No.
The Chinese patent literature of CN102944868A discloses a kind of low radar scattering cross section metallic support and its method for designing, according to low
RCS predictor formulas, select an outline line to be used for setting for cross section from one group of outline line characteristic formula expression in cross section
Meter, according to height and the inclination angle of support, uniformly connects each cross section, obtains the profile of support.
Above-mentioned patent document is optimized mainly for the scattering properties of low scattering support, and contoured cradle continues to use the wedge of classics
Body.Paper mainly simulates polystyrene foam plastics support and sphenoid metallic support.Polystyrene foam plastics support
In the reflection very little of centimetre wave band, application is wider；Sphenoid metallic support is less in the reflection of centimetre wave band and millimere-wave band, should
With relatively extensively, its cost is costly.
Terahertz wave band test system transmission power and dynamic range are limited, and test target is small-sized, substantially exist
Within 10cm, object module RCS very littles are not applied to the measurement such as terahertz wave band target RCS, dispersion image in prior art
Research.
The content of the invention
It is an object of the invention to provide low Scattering Targets support of a kind of terahertz wave band and preparation method thereof, preparation method
Simply, the material that the Metal pylon of making is selected has relatively low reflectivity in terahertz wave band, and Metal pylon Surface Machining is coarse
Degree meets measurement request, and Metal pylon reflection very little solves the support of THz wave wave band Electromagnetic Scattering of Target test target
Problem
In order to achieve the above object, the present invention is achieved through the following technical solutions：A kind of low Scattering Targets of terahertz wave band
The preparation method of support, is characterized in, comprises the steps of：
S1, the material and shape that determine initial fabrication Metal pylon；
S2, by simulation calculation, obtain Metal pylon surface maximum mismachining tolerance and reflectivity error relationship model；
S3, according to the material and shape of the initial fabrication Metal pylon for determining, make corresponding Metal pylon model；
S4, carried out instead using the Metal pylon model of different shapes that terahertz time-domain spectroscopy system is made to different materials
Rate test is penetrated, the reflectivity and Terahertz frequency relation figure of the Metal pylon model of different shapes that different materials make is obtained；
S5, the reflectivity of the Metal pylon model of different shapes made to different materials and Terahertz frequency relation figure enter
Row interpretation of result, it is determined that finally making the material and shape of Metal pylon.
The material of described initial fabrication Metal pylon is polytetrafluoroethylmaterial material and polystyrene material.
Described initial fabrication Metal pylon it is cylindrically shaped and conical.
In described step S3, the Surface Machining error of Metal pylon model is less than 0.13 times of wavelength.
In described step S3, a diameter of 2cm of the Metal pylon model of cylinder, is highly 12cm.
The a diameter of 2cm in upper surface of conical Metal pylon model in described step S3, basal diameter is 5cm, height
For 12cm.
In described step S5, the final material for making Metal pylon is polytetrafluoroethylmaterial material, described final making mesh
The conically shaped of support, and a diameter of 2cm in upper surface are marked, basal diameter is 5cm, is highly 12cm；Described final system
The Surface Machining error for making Metal pylon is less than 0.13 times of wavelength.
A kind of low Scattering Targets support of terahertz wave band, is characterized in,
Metal pylon is cone, and a diameter of 2cm in upper surface, and basal diameter is 5cm, is highly 12cm；Metal pylon
Surface Machining error be less than 0.13 times of wavelength；The material of Metal pylon is polytetrafluoroethylmaterial material.
Low Scattering Targets support of a kind of terahertz wave band of the present invention and preparation method thereof has following compared with prior art
Advantage：The preparation method of the present invention is simple, the Metal pylon of the present invention, and which is shaped as cone, with propping up that microwave frequency band is used
Frame form is similar to, but its material for using is polytetrafluoroethylene (PTFE), and the material of Metal pylon selection has relatively low in terahertz wave band
Reflectivity, the conventional foamed material of microwave band do not apply to, reflects larger, be not suitable for terahertz wave band, while being based on
Impact of the target surface microfluctuation to terahertz wave band scattering properties, it is proposed that the surface roughness processing of Metal pylon will
Ask, Metal pylon Surface Machining roughness meets measurement request.
Description of the drawings
Fig. 1 is the overall structure diagram of sphenoid Metal pylon in prior art；
Fig. 2 is a kind of flow chart of the preparation method of the low Scattering Targets support of terahertz wave band of the invention；
Fig. 3 is Metal pylon surface maximum mismachining tolerance and the reflectivity error model schematic diagram for causing；
Schematic diagrames of the Fig. 4 for cylindrical target support；
Fig. 5 is the schematic diagram of conical Metal pylon；
Fig. 6 is the schematic diagram of the Terahertz reflectivity of cylindrical polystyrene Metal pylon；
Fig. 7 is the schematic diagram of the Terahertz reflectivity of conical polytetrafluoroethylene (PTFE) Metal pylon.
Specific embodiment
Below in conjunction with accompanying drawing, by describing a preferably specific embodiment in detail, the present invention is further elaborated.
As shown in Fig. 2 a kind of preparation method of the low Scattering Targets support of terahertz wave band, comprises the steps of：
S1, the material and shape that determine initial fabrication Metal pylon.
Need in the present invention using the timbering material in terahertz wave band with antiradar reflectivity, can from material dielectric constant
To find out, polytetrafluoroethylene (PTFE) and polystyrene material are less in the dielectric constant of terahertz wave band, real part of permittivity 1.5～
Between 2, correspondingly its reflectivity in terahertz wave band is relatively low, i.e., the material of initial fabrication Metal pylon is polytetrafluoroethyl-ne
Alkene material and polystyrene material, initial fabrication Metal pylon it is cylindrically shaped and conical.
S2, by simulation calculation, obtain Metal pylon surface maximum mismachining tolerance and reflectivity error relationship model.
Terahertz wave band target surface smoothness has considerable influence to scattering properties, therefore, obtained by simulation calculation
Metal pylon surface maximum mismachining tolerance and reflectivity error relationship model, as shown in figure 3, according to computation model, will be anti-
Rate control errors are penetrated within 1dB, Metal pylon Surface Machining error needs control below 0.13 times of wavelength.
S3, according to the material and shape of the initial fabrication Metal pylon for determining, make corresponding Metal pylon model.
Cylindrical target stent model and cone have been made respectively using polytetrafluoroethylmaterial material and polystyrene material
Metal pylon model, totally four models, wherein, a diameter of 2cm of cylindrical target stent model is highly 12cm, such as Fig. 4 institutes
Show；The a diameter of 2cm in upper surface of conical Metal pylon model, basal diameter is 5cm, is highly 12cm, as shown in Figure 5.
S4, carried out instead using the Metal pylon model of different shapes that terahertz time-domain spectroscopy system is made to different materials
Rate test is penetrated, the reflectivity and Terahertz frequency relation figure of the Metal pylon model of different shapes that different materials make is obtained.
Reflectance test is carried out to two kinds of brackets of different materials using terahertz time-domain spectroscopy system, has been obtained
Cylindrical polytetrafluoroethylene (PTFE) support and cylindrical polystyrene holder reflectivity and Terahertz frequency relation figure, such as Fig. 6 and Fig. 7 institutes
Show, from terms of result, terahertz wave band reflectivity all very littles of two kinds of Metal pylon models, cylindrical polystyrene Metal pylon exist
Reflectivity between 0.2THz～1THz is 0.005～0.02, and more than 1THz reflectivity is substantially below 0.005；Cylinder
Reflectivity of the polytetrafluoroethylene (PTFE) Metal pylon between 0.2THz～1THz is 0.004～0.02, and more than 1THz reflectivity is basic
On below 0.002, the reflectivity of polytetrafluoroethylene (PTFE) cylindrical target support is especially little；Conical polytetrafluoroethylene (PTFE) and polyphenyl second
Alkene Metal pylon reflectance test is not received by THz wave reflected signal, and conical Metal pylon can make its reflection too
Hertz wave is away from detector.
S5, the reflectivity of the Metal pylon model of different shapes made to different materials and Terahertz frequency relation figure enter
Row interpretation of result, it is determined that finally making the material and shape of Metal pylon.
The final material for making Metal pylon is polytetrafluoroethylmaterial material, and described final making Metal pylon is shaped as
Cone, and a diameter of 2cm in upper surface, basal diameter is 5cm, is highly 12cm；The table of described final making Metal pylon
Face mismachining tolerance is less than 0.13 times of wavelength.
The invention also discloses the Metal pylon that a kind of employing said method is obtained, Metal pylon is cone, and upper table
The a diameter of 2cm in face, basal diameter is 5cm, is highly 12cm；The Surface Machining error of Metal pylon is less than 0.13 times of wavelength；Mesh
The material of mark support is polytetrafluoroethylmaterial material.
Although present disclosure has been made to be discussed in detail by 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 the above, for the present invention's
Various modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (8)
1. the preparation method of the low Scattering Targets support of a kind of terahertz wave band, it is characterised in that comprise the steps of：
S1, the material and shape that determine initial fabrication Metal pylon；
S2, by simulation calculation, obtain Metal pylon surface maximum mismachining tolerance and reflectivity error relationship model；
S3, according to the material and shape of the initial fabrication Metal pylon for determining, make corresponding Metal pylon model；
S4, reflectivity is carried out using the Metal pylon model of different shapes that terahertz time-domain spectroscopy system is made to different materials
Test, obtains the reflectivity and Terahertz frequency relation figure of the Metal pylon model of different shapes that different materials make；
S5, the reflectivity of the Metal pylon model of different shapes made to different materials and Terahertz frequency relation figure are tied
Fruit is analyzed, it is determined that finally making the material and shape of Metal pylon.
2. preparation method as claimed in claim 1, it is characterised in that the material of described initial fabrication Metal pylon is poly- four
Fluoride material and polystyrene material.
3. preparation method as claimed in claim 1, it is characterised in that described initial fabrication Metal pylon is shaped as cylinder
Shape and cone.
4. preparation method as claimed in claim 1, it is characterised in that the surface of Metal pylon model adds in described step S3
Work error is less than 0.13 times of wavelength.
5. preparation method as claimed in claim 1, it is characterised in that the Metal pylon model of cylinder in described step S3
A diameter of 2cm, be highly 12cm.
6. preparation method as claimed in claim 1, it is characterised in that conical Metal pylon model in described step S3
The a diameter of 2cm in upper surface, basal diameter is 5cm, is highly 12cm.
7. preparation method as claimed in claim 1, it is characterised in that the final material for making Metal pylon in described step S5
Expect for polytetrafluoroethylmaterial material, conically shaped, and a diameter of 2cm in upper surface of described final making Metal pylon, bottom
The a diameter of 5cm in face, is highly 12cm；The Surface Machining error of described final making Metal pylon is less than 0.13 times of wavelength.
8. the low Scattering Targets support of a kind of terahertz wave band, it is characterised in that
Metal pylon is cone, and a diameter of 2cm in upper surface, and basal diameter is 5cm, is highly 12cm；The table of Metal pylon
Face mismachining tolerance is less than 0.13 times of wavelength；The material of Metal pylon is polytetrafluoroethylmaterial material.
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| CN201610957290.8A CN106556819B (en) | 2016-10-27 | 2016-10-27 | Low Scattering Targets bracket of terahertz wave band and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112066207A (en) * | 2020-09-14 | 2020-12-11 | 北京环境特性研究所 | Integrated support for large-mass low-scattering target RCS test and application thereof |
| CN113008172A (en) * | 2021-03-03 | 2021-06-22 | 北京理工大学 | Terahertz wave-based ice and snow track inspection device and method |
| CN113655454A (en) * | 2021-09-13 | 2021-11-16 | 上海无线电设备研究所 | Terahertz cloud-finding radar reflectivity factor calibration method based on millimeter-wave radar |
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| EP0943101A1 (en) * | 1996-07-05 | 1999-09-22 | Försvarets Forskningsanstalt | Method of detecting and classifying objects by means of radar |
| CN105242250A (en) * | 2015-11-25 | 2016-01-13 | 北京机电工程研究所 | Calibration device capable of facing very low radar cross-section (RCS) targets to measure |
| CN105676184A (en) * | 2016-01-11 | 2016-06-15 | 北京环境特性研究所 | Low-scattering metal bracket system for remote calibration during RCS measurement process |
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| EP0943101A1 (en) * | 1996-07-05 | 1999-09-22 | Försvarets Forskningsanstalt | Method of detecting and classifying objects by means of radar |
| CN105242250A (en) * | 2015-11-25 | 2016-01-13 | 北京机电工程研究所 | Calibration device capable of facing very low radar cross-section (RCS) targets to measure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112066207A (en) * | 2020-09-14 | 2020-12-11 | 北京环境特性研究所 | Integrated support for large-mass low-scattering target RCS test and application thereof |
| CN113008172A (en) * | 2021-03-03 | 2021-06-22 | 北京理工大学 | Terahertz wave-based ice and snow track inspection device and method |
| CN113655454A (en) * | 2021-09-13 | 2021-11-16 | 上海无线电设备研究所 | Terahertz cloud-finding radar reflectivity factor calibration method based on millimeter-wave radar |
| CN113655454B (en) * | 2021-09-13 | 2024-01-02 | 上海无线电设备研究所 | Terahertz cloud detection radar reflectivity factor calibration method based on millimeter wave radar |
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