CN113075626A - Low-scattering carrier for darkroom background level evaluation test - Google Patents
Low-scattering carrier for darkroom background level evaluation test Download PDFInfo
- Publication number
- CN113075626A CN113075626A CN202110347454.6A CN202110347454A CN113075626A CN 113075626 A CN113075626 A CN 113075626A CN 202110347454 A CN202110347454 A CN 202110347454A CN 113075626 A CN113075626 A CN 113075626A
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- carrier
- low
- scattering carrier
- low scattering
- rotating top
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- 238000012360 testing method Methods 0.000 title claims abstract description 12
- 238000011156 evaluation Methods 0.000 title abstract description 14
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000853 adhesive Substances 0.000 claims abstract description 5
- 230000001070 adhesive effect Effects 0.000 claims abstract description 5
- 239000011888 foil Substances 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 3
- 230000003746 surface roughness Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000013461 design Methods 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 3
- 239000006260 foam Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
- G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention relates to a low-scattering carrier for a darkroom background level evaluation test, which is drop-shaped and is provided with a head part and a tail part which is relatively sharp relative to the head part, wherein the included angle alpha of the tail part is 10-60 degrees; the carrier has an upper surface and a lower surface; the upper surface is a curved surface protruding upwards; the lower surface is a plane, and a circular interface for fixedly connecting with the rotating top is designed in the middle of the lower surface; the upper surface and the lower surface are connected seamlessly. The evaluation equipment and the bracket interface integrated structure design enables the equipment and the bracket to be smoothly connected, the curvature of the interface is consistent, no obvious step difference exists, the gaps and the screws are sealed by aluminum foils or conductive adhesives, the scattering interference of the bottom edge and the inner cavity structure of the equipment can be eliminated, the evaluation equipment is vital to the accuracy of obtaining the background level response of a darkroom in a test, and good economic benefit and social benefit can be generated after wide popularization and application.
Description
Technical Field
The invention relates to the technical field of electromagnetic scattering property measurement, in particular to a low-scattering carrier for darkroom background level evaluation test.
Background
The method comprises the following steps that firstly, a blank field is measured to obtain background level response in darkroom RCS measurement, when a foam support supports, a low-scattering evaluation device needs to be loaded to obtain a background scattering magnitude under a target test state, and when a low-scattering metal support supports, a two-dimensional turntable exists at the top of the support, so that if effective shielding is not performed, background scattering test cannot be performed. Therefore, a low scattering carrier for measuring background level response is needed, which avoids specular reflection and edge diffraction and can better suppress traveling wave scattering, so that the carrier can be used for more accurately measuring and evaluating.
Therefore, in response to the above deficiencies, it is desirable to provide a low scattering carrier for darkroom background level evaluation tests.
Disclosure of Invention
Technical problem to be solved
The invention aims to solve the technical problem that the conventional RCS measuring method has the problems of mirror reflection, edge diffraction and traveling wave scattering.
(II) technical scheme
In order to solve the technical problem, the invention provides a low-scattering carrier for a darkroom background level evaluation test, which is drop-shaped and comprises a head part and a tail part which is relatively sharp relative to the head part, wherein the tail part has an included angle alpha of 10-60 degrees; the carrier has an upper surface and a lower surface; the upper surface is a curved surface protruding upwards; the lower surface is a plane, a circular interface for fixedly connecting with the rotating top is designed in the middle of the lower surface, and a plurality of screw holes are formed in the circumference of the circular interface; the upper surface and the lower surface are connected seamlessly.
And the included angle alpha of the tail part of the low-scattering carrier is the included angle of the vertical projection of the tail tip on the bottom surface.
The length L between the head and the tail of the low scattering carrier is 0.5-3 m.
Preferably, the width W of the lower surface of the low scattering carrier is 0.7-0.8 m.
Preferably, the height H from the apex of the curved surface of the upper surface to the lower surface of the low scattering carrier is 0.2 to 0.4 m.
Preferably, the surface roughness of both the upper and lower surfaces of the low scattering support is less than 1.6.
Preferably, the rotating top fixedly connected with the lower surface of the low scattering carrier is provided with a screw hole, and the low scattering carrier is connected with the rotating top through a countersunk screw.
Preferably, the screw hole of the rotating top is arranged at the position where the distance between the circle center of the screw hole and the circle center of the rotating top is 180 mm and 190 mm.
Preferably, the low scattering carrier is made of an aluminum material.
Preferably, a gap between the upper surface of the low-scattering carrier and the rotating top is covered by aluminum foil or conductive adhesive.
(III) advantageous effects
The technical scheme of the invention has the following advantages:
the invention has the characteristics of reliability and applicability, has good popularization and application values, evaluates the integrated structural design of the equipment and the bracket interface, enables the equipment and the bracket to be smoothly connected, has consistent curvature of the interface, has no obvious step difference, seals gaps and screws by using aluminum foil or conductive adhesive, can eliminate scattering interference of the bottom edge and inner cavity structure of the equipment, is vital to the accuracy of obtaining darkroom background level response in a test, and can generate good economic benefit and social benefit after wide popularization and application.
Drawings
FIG. 1 is a top view of a low scattering carrier of the present invention;
FIG. 2 is a side view of a low scatter carrier of the present invention;
FIG. 3 is an oblique view of the low scattering carrier of the present invention;
fig. 4 is a schematic view of the combination of the low scattering carrier of the present invention and a rotating roof.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention provides a low-scattering carrier for a darkroom background level evaluation test, which is shown in figure 1, and the mutual coupling influence is as low as possible in consideration of the assembly relationship of the carrier and a bracket system, the low-scattering carrier is in a drop shape and is provided with a head part and a tail part which is relatively sharp relative to the head part, and the included angle alpha of the tail part is 10-60 degrees; and the included angle alpha of the tail part of the low-scattering carrier is the included angle of the vertical projection of the tail tip on the bottom surface.
As shown in fig. 2, the carrier has an upper surface and a lower surface; the upper surface is a curved surface protruding upwards; as shown in fig. 3, the lower surface is a plane, a circular interface for fixedly connecting with a rotating top is designed in the middle of the lower surface, and a plurality of screw holes are formed in the circumference of the circular interface; the upper surface and the lower surface are connected seamlessly. The carrier has good surface current guiding function, avoids mirror reflection and edge diffraction, and can well inhibit traveling wave scattering.
The length L between the head and the tail of the low scattering carrier is 0.5-3m (e.g. 1.509 m).
Preferably, the width W of the lower surface of the low scattering carrier is 0.7-0.8m (e.g. 0.715 m).
Preferably, the height H from the apex of the curved surface of the upper surface to the lower surface of the low scattering carrier is 0.2-0.4m (e.g., 0.244 m).
Preferably, the upper surface and the lower surface of the carrier have high smoothness, and the surface roughness of the upper surface and the lower surface of the low-scattering carrier are less than 1.6.
Preferably, the rotating top fixedly connected with the lower surface of the low scattering carrier is provided with a screw hole, and the low scattering carrier is connected with the rotating top through a countersunk screw.
Preferably, the screw hole of the rotating top is arranged at a position (for example, 182.5m) with the distance of 180 mm and 190mm between the center of the screw hole and the center of the rotating top.
Preferably, the low scattering carrier is made of an aluminum material.
Preferably, a gap between the upper surface of the low-scattering carrier and the rotating top is covered by aluminum foil or conductive adhesive.
The evaluation equipment and the bracket interface are designed into an integrated structure, so that the equipment and the bracket rotating top can be smoothly connected, the curvatures of the interfaces are consistent, and no obvious step difference exists.
The evaluation equipment is designed to be universal and is suitable for evaluation and evaluation of various darkroom background level responses. A circular cover plate with corresponding size is designed for a circular interface on the lower surface of the carrier, so that the circular cover plate is suitable for both a metal support and a foam support, and accurate measurement can be performed under both conditions.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A low scattering carrier for use in darkroom background level assessment testing, comprising: the low-scattering carrier is in a water-drop shape and is provided with a head part and a tail part which is relatively sharp relative to the head part, and the included angle alpha of the tail part is 10-60 degrees;
the carrier has an upper surface and a lower surface;
the upper surface is a curved surface protruding upwards; the lower surface is a plane, a circular interface for fixedly connecting with the rotating top is designed in the middle of the lower surface, and a plurality of screw holes are formed in the circumference of the circular interface;
the upper surface and the lower surface are connected seamlessly.
2. The low scattering carrier of claim 1, wherein:
the length L between the head and the tail of the low scattering carrier is 0.5-3 m.
3. The low scattering carrier of claim 1, wherein:
the width W of the lower surface of the low scattering carrier is 0.7-0.8 m.
4. The low scattering carrier of claim 1, wherein:
the height H from the curved surface vertex of the upper surface of the low scattering carrier to the lower surface is 0.2-0.4 m.
5. The low scattering carrier of claim 1, wherein:
the surface roughness of the upper surface and the lower surface of the low scattering carrier are both less than 1.6.
6. The low scattering carrier of claim 1, wherein:
the rotating top fixedly connected with the lower surface of the low scattering carrier is provided with a screw hole, and the low scattering carrier is connected with the rotating top through a sunk screw.
7. The low scattering carrier of claim 6, wherein:
the screw hole of the rotating top is arranged at the position where the distance between the circle center of the screw hole and the circle center of the rotating top is 180 mm and 190 mm.
8. The low scattering carrier of claim 1, wherein:
the low-scattering carrier is made of aluminum material.
9. The low scattering carrier of claim 8, wherein:
and a gap between the upper surface of the low-scattering carrier and the rotating top is covered by aluminum foil adhesion or conductive adhesive sealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110347454.6A CN113075626A (en) | 2021-03-31 | 2021-03-31 | Low-scattering carrier for darkroom background level evaluation test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110347454.6A CN113075626A (en) | 2021-03-31 | 2021-03-31 | Low-scattering carrier for darkroom background level evaluation test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113075626A true CN113075626A (en) | 2021-07-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110347454.6A Pending CN113075626A (en) | 2021-03-31 | 2021-03-31 | Low-scattering carrier for darkroom background level evaluation test |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113687323A (en) * | 2021-10-26 | 2021-11-23 | 中国航发四川燃气涡轮研究院 | Low-scattering shell for binary vector engine and application thereof |
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|---|---|---|---|---|
| US20140002297A1 (en) * | 2012-06-27 | 2014-01-02 | Government Of The United States, As Represented By The Secretary Of The Air Force | Low Clutter Method for Bistatic RCS Measurements |
| CN106428625A (en) * | 2016-09-14 | 2017-02-22 | 北京环境特性研究所 | Low-scattering carrier used for RCS test |
| CN106443611A (en) * | 2015-11-11 | 2017-02-22 | 北京航空航天大学 | RCS measurement method for weak scattering targets |
| CN108445463A (en) * | 2018-03-07 | 2018-08-24 | 北京环境特性研究所 | Low scattering part RCS test methods based on scattering center space filtering and carrier |
| CN108535712A (en) * | 2018-03-29 | 2018-09-14 | 北京环境特性研究所 | A kind of polarimetric calibration device and radar scattering polarization measurement system |
| CN109212504A (en) * | 2018-10-09 | 2019-01-15 | 北京环境特性研究所 | To scattering carrier low with what is laterally designed before taking into account |
| CN110954868A (en) * | 2019-12-05 | 2020-04-03 | 中国航发四川燃气涡轮研究院 | Low-scattering shell for engine suitable for electromagnetic test of external field wind environment |
| CN111273247A (en) * | 2020-02-14 | 2020-06-12 | 北京环境特性研究所 | Test method for RCS measurement background cancellation and indoor RCS test system |
| CN111504952A (en) * | 2020-04-15 | 2020-08-07 | 成都飞机工业（集团）有限责任公司 | Low-scattering carrier with both horizontal polarization and vertical polarization and testing method thereof |
-
2021
- 2021-03-31 CN CN202110347454.6A patent/CN113075626A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140002297A1 (en) * | 2012-06-27 | 2014-01-02 | Government Of The United States, As Represented By The Secretary Of The Air Force | Low Clutter Method for Bistatic RCS Measurements |
| CN106443611A (en) * | 2015-11-11 | 2017-02-22 | 北京航空航天大学 | RCS measurement method for weak scattering targets |
| CN106428625A (en) * | 2016-09-14 | 2017-02-22 | 北京环境特性研究所 | Low-scattering carrier used for RCS test |
| CN108445463A (en) * | 2018-03-07 | 2018-08-24 | 北京环境特性研究所 | Low scattering part RCS test methods based on scattering center space filtering and carrier |
| CN108535712A (en) * | 2018-03-29 | 2018-09-14 | 北京环境特性研究所 | A kind of polarimetric calibration device and radar scattering polarization measurement system |
| CN109212504A (en) * | 2018-10-09 | 2019-01-15 | 北京环境特性研究所 | To scattering carrier low with what is laterally designed before taking into account |
| CN110954868A (en) * | 2019-12-05 | 2020-04-03 | 中国航发四川燃气涡轮研究院 | Low-scattering shell for engine suitable for electromagnetic test of external field wind environment |
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| CN111504952A (en) * | 2020-04-15 | 2020-08-07 | 成都飞机工业（集团）有限责任公司 | Low-scattering carrier with both horizontal polarization and vertical polarization and testing method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113687323A (en) * | 2021-10-26 | 2021-11-23 | 中国航发四川燃气涡轮研究院 | Low-scattering shell for binary vector engine and application thereof |
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Application publication date: 20210706 |