CN111504952B - Low-scattering carrier with both horizontal polarization and vertical polarization and testing method thereof - Google Patents
Low-scattering carrier with both horizontal polarization and vertical polarization and testing method thereof Download PDFInfo
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Abstract
The invention provides a low-scattering carrier giving consideration to both horizontal and vertical polarization and a test method thereof, relating to the field of electromagnetic scattering measurement, and firstly providing the low-scattering carrier which comprises a carrier, wherein the carrier consists of an upper curved surface, a lower curved surface and a transition curved surface, the carrier is of a metal hollow structure and is in a water-drop shape, the left and right axes are symmetrical, the more sharp ends of the two ends of the carrier are head parts, the other ends of the two ends of the carrier are tail parts, the upper curved surface 1 of the carrier, which is close to the head parts, is a plane, and the tail parts of the carrier are bent downwards; the forward sharp angle and the backward sharp angle of the carrier meet certain limitation, horizontal polarization and vertical polarization can be considered due to special structural limitation, and the test method provided based on the low-scattering carrier can be directly applied to the low-scattering carrier, so that the problem that the existing low-scattering carrier cannot well consider horizontal polarization and vertical polarization is solved.
Description
Technical Field
The invention relates to the field of electromagnetic scattering measurement, in particular to a low-scattering carrier with both horizontal polarization and vertical polarization and a test method thereof.
Background
In the development process of the stealth aircraft, a large number of designed RCS (Radar Cross Section) tests are required to select parameters and verify simulation calculation results. The size of the aircraft stealth part is generally between 1 and 5m, if the aircraft stealth part is directly used for RCS testing, on one hand, the RCS of the part cannot be implemented due to the fact that the size of the aircraft stealth part is larger than the size of a common darkroom dead zone, on the other hand, the RCS of the part can be larger than that of a pre-testing material, a pre-testing detail or an antenna, and therefore the RCS mound of the pre-testing material or the pre-testing detail is not included in the RCS of the part; on the other hand, if only the detail or the antenna is tested separately, the detail and the antenna once isolated from the stealth component will have their edges and the buried structure completely exposed, and a new scattering source is introduced to affect the accuracy of the test. The prior art uses a low scattering carrier which is an effective solution, the size of the low scattering carrier is far smaller than that of a stealth part and is within the range of a darkroom dead zone; the low-scattering carrier can eliminate edge scattering of the measured target and cover the inner cavity structure; the scattering level of the low scattering carrier is low and is generally 1-2 orders of magnitude lower than that of the target to be detected, and the pre-test material, the detailed structure or the antenna is arranged on the low scattering carrier, so that the RCS of the target to be detected can be embodied.
Generally, when the vertical polarization (VV) effect is good, the horizontal polarization (HH) effect is poor, and when the horizontal polarization effect is good, the vertical polarization effect is poor, for the same low-scattering carrier. In order to ensure that both polarizations have good low scattering levels, a scheme of multiple sets of carriers sometimes has to be adopted to meet requirements, so that the design and manufacturing cost is increased, the workload of replacing the carriers during testing is increased, and the working efficiency is reduced.
The invention discloses a low-scattering carrier for RCS test, which is disclosed in patent publication No. CN106428625A, published 2017, 2, 22 and named as 'a low-scattering carrier for RCS test', and the scheme has the advantages that the state of the component in actual installation can be simulated well, and meanwhile, the backscattering can be lower in a larger angle range. The disadvantage is that it is difficult to compromise between low scattering levels for both horizontal and vertical polarization.
The invention discloses an invention patent of publication No. CN109212504A, published 2019, 1, 15 and named as 'low scattering carrier with both forward and lateral design', and the scheme discloses a low scattering carrier with both forward and lateral design, which has the advantages of good surface current guiding effect, effective reduction of traveling wave scattering contribution and lower scattering level in both forward and lateral directions. Also, it has the disadvantage that it is difficult to compromise between low scattering levels for both horizontal and vertical polarizations.
There is an urgent need for a low scattering carrier that can achieve both horizontal and vertical polarization.
Disclosure of Invention
The invention aims to: the invention provides a low scattering carrier giving consideration to horizontal polarization and vertical polarization and a test method thereof, and the low scattering carrier is provided firstly, can give consideration to the horizontal polarization and the vertical polarization due to the special structural limitation, and can be directly applied to the low scattering carrier based on the test method provided by the low scattering carrier, thereby solving the problem that the existing low scattering carrier cannot give consideration to the horizontal polarization and the vertical polarization well.
The technical scheme adopted by the invention is as follows:
a low-scattering carrier giving consideration to both horizontal polarization and vertical polarization comprises a carrier, wherein the carrier is composed of an upper curved surface, a lower curved surface and a transition curved surface, is of a metal hollow structure, is in a water-drop shape, and is symmetrical to the left and right;
the sharper ends of the two ends of the carrier are head parts, the other ends of the two ends of the carrier are tail parts, the upper curved surface of the carrier close to the head parts is a plane, and the tail parts of the carrier are bent downwards;
the carrier satisfies the following conditions:
forward tip angle thetaf≤180°-2(α+Δ) (1)
Rear tip angle thetae≥2(α+Δ) (2)
Where α is the angle of the forward angular region of interest, Δ is the margin from the forward angular region of interest, and the angles α and Δ in the equation are in degrees.
For a forward tip angle theta in this schemefAnd a rear tip angle thetaeThe angle of the front sharp angle and the back sharp angle are respectively the angle of the head part and the angle of the tail part in the top view of the carrier, the angle alpha of the forward attention angle domain plus the margin delta deviating from the forward attention angle domain are the included angles of the incident line and the scattering line at the position of the mirror scattering wave peak when the incident is carried out in the direction which is opposite to the front sharp angle and is parallel to the angle bisector of the front sharp angle in the practical test, and then the angle of the front sharp angle theta is measuredfAfter the limitation in the formula (1), when the electromagnetic wave is vertically incident to the side edge of the carrier under horizontal polarization and vertical polarization, the included angle between the mirror reflection peak and the 0-degree incident direction is larger than or equal to alpha + delta and is positioned outside the forward RCS key reduction area.
And we aim at backward sharp angles thetaeAfter the limitation in the formula (2), when the electromagnetic wave is incident at an incident angle of 0 degrees under horizontal polarization, the surface of the carrier is parallel to the electric field, and traveling wave electricity cannot occur; the edge of the carrier forms an included angle with the electric field at a certain angle, so that the edge of the carrier can generate traveling wave current, and when the edge suddenly changes, the carrier can generate reflection to form traveling wave scattering at the edge, and because the carrier backwards forms a sharp angle thetaeThe included angle between the trailing edge travelling wave scattering wave crest and the 0-degree incident position is more than or equal to alpha + delta and is positioned outside the forward RCS key reduction area;
when electromagnetic waves are incident perpendicularly to the rear edge of the carrier under vertical polarization, the carrier has a sharp angle thetaeThe included angle between the trailing edge traveling wave scattering peak and the 0-degree incidence position is less than or equal to 90 degrees- (alpha + delta), and is within the azimuth angle of the forward RCS reduction key point, so that the traveling wave scattering is further inhibited, the tail of the carrier is bent downwards, the curvature radius of the surface wave is gradually and continuously reduced from large when the surface wave is propagated along the surface of the shape, no obvious abrupt change boundary line exists, the traveling wave radiates energy along the tangential direction of the traveling wave at any time in the conduction process, and the traveling wave is gradually reduced, so that the contribution of the traveling wave is inhibited.
In order to better realize the scheme, further, a flange interface is concavely arranged on the plane part of the upper curved surface, the flange interface is lower than the plane part of the upper curved surface, and the upper surface of the mounting seat of the test target is flush with the plane part of the upper curved surface after the mounting seat of the test target is mounted on the flange interface.
In order to better realize the scheme, further, the angle alpha of the forward attention angle domain is 45 degrees, the margin delta of the deviation from the forward attention angle domain ranges from 5 degrees to 10 degrees, and the surface roughness Ra of the carrier is less than or equal to 1.6.
In order to better implement the scheme, further, the length L of the carrier ranges from 800mm to 1000mm, and the width W of the carrier ranges from 600mm to 800 mm.
In order to better realize the scheme, the height H of the carrier is determined according to the height of the embedded part of the part to be tested, and the Delta H is 5 mm-10 mm, or the range of the part without the embedded part H is 60 mm-80 mm.
In order to better realize the scheme, further, the height H1 of the tail end point of the carrier is less than or equal to H.
In order to better implement the scheme, furthermore, the curvature is continuous at the butt joint part along the curved surface of the length direction of the carrier.
A method for testing a low scattering carrier with both horizontal and vertical polarization, which is used for testing the low scattering carrier with both horizontal and vertical polarization, and comprises the following steps in sequence:
first, the installation before testing was performed:
step S1: the head of the carrier is just opposite to the incident direction of the electromagnetic wave;
step S2: placing a test target to be tested into a flange interface on the upper curved surface of the carrier, and enabling the edge of a cover plate of the test target to be parallel to the edge of the carrier, so that the wave crests of traveling waves formed by the edge of the cover plate and the edge of the carrier are overlapped when electromagnetic waves are vertically polarized and incident;
step S3: after the test target is installed, detection ensures that when the carrier is placed on the rotary table, the end point of the tail of the carrier does not contact the rotary table, so that sharp point scattering caused by exposure to an electromagnetic wave illumination area during testing is avoided;
then, respectively carrying out horizontal polarization test and vertical polarization test, wherein the horizontal polarization test is as follows:
step S4: when electromagnetic waves are incident at an incident angle of 0 degrees under horizontal polarization, the surface of the carrier is parallel to the electric field, and traveling wave current cannot occur;
because the edge of the carrier forms a certain angle included angle with the electric field, the edge of the carrier can generate traveling wave current, when the edge suddenly changes, the carrier can generate reflection to form traveling wave scattering of the edge, and because the carrier backwards forms a sharp angle thetaeThe included angle between the trailing edge travelling wave scattering wave crest and the 0-degree incident position is more than or equal to alpha + delta and is positioned outside the forward RCS key reduction area;
wherein the vertical polarization test is:
step S5: electromagnetic waves are incident perpendicularly to the trailing edge of the carrier under vertical polarization due to the backward pointing angle theta of the carriereThe included angle between the trailing edge traveling wave scattering peak and the 0-degree incidence azimuth is not more than 90- (alpha + delta), and the included angle is within the forward RCS reduction key azimuth;
the carrier tail is bent downward, so that the traveling wave scattering can be further suppressed, and the curvature radius of the surface wave is gradually and continuously reduced from large when the surface wave propagates along the surface of the shape.
The steps S4 and S5 can be switched in order or performed simultaneously using two identical carriers.
The method for testing the low-scattering carrier with both horizontal polarization and vertical polarization in the scheme is a method for testing the low-scattering carrier with both horizontal polarization and vertical polarization in the scheme, and particularly a method for testing the horizontal polarization and the vertical polarization.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the invention provides a low scattering carrier giving consideration to both horizontal polarization and vertical polarization and a test method thereof, and provides the low scattering carrier which can give consideration to both horizontal polarization and vertical polarization due to special structural limitation, so that the problem that the existing low scattering carrier cannot give consideration to both horizontal polarization and vertical polarization and has lower scattering level is solved;
2. the invention provides a low-scattering carrier with horizontal polarization and vertical polarization and a test method thereof, and provides a test method of the low-scattering carrier with horizontal polarization and vertical polarization.
Drawings
In order to more clearly illustrate the technical solution, the drawings needed to be used in the embodiments are briefly described below, and it should be understood that, for those skilled in the art, other related drawings can be obtained according to the drawings without creative efforts, wherein:
FIG. 1 is a flow chart of a test method of the present invention;
FIG. 2 is an isometric view of an uninstalled test object of the present invention;
FIG. 3 is a schematic diagram of the present invention for conducting an RCS test of an onboard antenna;
FIG. 4 is a schematic diagram of the gap width RCS test performed by the present invention;
FIG. 5 is a top view of the carrier of the present invention;
FIG. 6 is a side perspective projection of the carrier of the present invention;
FIG. 7 is a front perspective projection view of the carrier of the present invention;
FIG. 8 is a boundary view of the carrier of the present invention in top projection;
FIG. 9 is a cross-sectional view of a carrier of the present invention;
FIG. 10 is a schematic diagram of the incidence/reflection of electromagnetic waves perpendicular to the lateral edges under horizontal and vertical polarization of a carrier according to the present invention;
FIG. 11 is a schematic diagram of the reflection of the trailing traveling wave of the present invention when the electromagnetic wave is incident at 0 ° with horizontal polarization of the carrier;
FIG. 12 is a schematic diagram of the reflection of the trailing traveling wave at 0 incident of an electromagnetic wave under vertical polarization of a carrier according to the present invention;
FIG. 13 is a schematic illustration of carrier tail bending to suppress traveling waves in accordance with the present invention;
FIG. 14 is a plot of the RCS of an embodiment of the present invention as a function of azimuth angle for both horizontal and vertical polarizations of the carrier C-band of the present invention;
FIG. 15 is a plot of the RCS of an embodiment of the present invention as a function of azimuth angle for both horizontal and vertical polarizations of the carrier X band of the present invention;
FIG. 16 is a plot of RCS as a function of azimuth for an embodiment of the present invention under both horizontal and vertical polarizations of the carrier Ku band of the present invention;
in the figure, 1-upper curved surface, 2-lower curved surface, 3-transition curved surface and 4-flange interface.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, 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 should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and therefore should not be considered as a limitation to the scope of protection. 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.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The present invention will be described in detail with reference to fig. 1 to 16.
Example 1:
a low-scattering carrier with both horizontal and vertical polarization, as shown in fig. 2-9, comprises a carrier composed of an upper curved surface 1, a lower curved surface 2 and a transition curved surface 3, wherein the carrier is of a metal hollow structure and is in a drop shape and is symmetrical with respect to a left axis and a right axis
The sharper ends of the two ends of the carrier are head parts, the other ends of the two ends of the carrier are tail parts, the upper curved surface 1 of the carrier close to the head parts is a plane, and as shown in figures 2, 3, 4, 6 and 9, the tail parts of the carrier are bent downwards;
as shown in fig. 8 and 10, the carrier satisfies
Forward tip angle thetaf≤180°-2(α+Δ) (1)
Rear tip angle thetae≥2(α+Δ) (2)
As shown in fig. 10, where α is the angle of the forward angular region of interest, Δ is the margin from the forward angular region of interest, and the angle units of α and Δ in the formula are degrees.
For a forward tip angle theta in this schemefAnd a rear tip angle thetaeThe angle of the front sharp angle and the back sharp angle are respectively the angle of the head part and the angle of the tail part in the top view of the carrier, the angle alpha of the forward attention angle domain plus the margin delta deviating from the forward attention angle domain are the included angles of the incident line and the scattering line at the position of the mirror scattering wave peak when the incident is carried out in the direction which is opposite to the front sharp angle and is parallel to the angle bisector of the front sharp angle in the practical test, and then the angle of the front sharp angle theta is measuredfAfter the limitation in the formula (1), when the electromagnetic wave is vertically incident to the side edge of the carrier under horizontal polarization and vertical polarization, the included angle between the mirror reflection peak and the 0-degree incident direction is larger than or equal to alpha + delta and is positioned outside the forward RCS key reduction area.
And we aim at backward sharp angles thetaeAfter the limitation in the formula (2), when the electromagnetic wave is incident at an incident angle of 0 degrees under horizontal polarization, the surface of the carrier is parallel to the electric field, and traveling wave electricity cannot occur; the edge of the carrier forms an included angle with the electric field at a certain angle, so that the edge of the carrier can generate traveling wave current, and when the edge suddenly changes, the carrier can generate reflection to form traveling wave scattering at the edge, and because the carrier backwards forms a sharp angle thetaeThe included angle between the trailing edge travelling wave scattering wave crest and the 0-degree incident position is more than or equal to alpha + delta and is positioned outside the forward RCS key reduction area;
when electromagnetic waves are incident perpendicularly to the rear edge of the carrier under vertical polarization, the carrier has a sharp angle thetaeNot less than 2 (alpha + delta), the included angle between the trailing edge traveling wave scattering wave crest and the 0-degree incident orientation is not more than 90 degrees- (alpha + delta),the carrier tail is bent downwards, so that the curvature radius of the surface wave is gradually and continuously reduced from large to small when the surface wave is transmitted along the surface of the carrier, no obvious abrupt change boundary line exists, the traveling wave radiates energy along the tangential direction of the traveling wave at any time in the transmission process, and the traveling wave is gradually weakened, so that the contribution of the traveling wave is restrained.
Example 2:
on the basis of the above embodiment 1, as shown in fig. 3, the planar portion of the upper curved surface 1 is concavely provided with a flange interface 4, the flange interface 4 is lower than the planar portion of the upper curved surface 1, and it is ensured that the upper surface of the mounting base of the test object is flush with the planar portion of the upper curved surface 1 after the mounting base of the test object is mounted on the flange interface 4, as shown in fig. 4, the edge of the cover plate is parallel to the edge of the carrier, as shown in fig. 5, so that the traveling wave peaks formed by the edge of the cover plate and the edge of the carrier when the electromagnetic waves are vertically polarized and incident are coincident.
In order to better realize the scheme, further, the angle alpha of the forward attention angle domain is 45 degrees, the margin delta of the deviation from the forward attention angle domain ranges from 5 degrees to 10 degrees, and the surface roughness Ra of the carrier is less than or equal to 1.6.
In order to better implement the scheme, further, the length L of the carrier ranges from 800mm to 1000mm, and the width W of the carrier ranges from 600mm to 800 mm. As shown in FIG. 6, the carrier is symmetrical about the symmetry line, the length L ranges from 800mm to 1000mm, the width W ranges from 600mm to 800mm, and the height H of the carrier ranges from 60mm to 80mm for a part without an embedded part, thereby meeting the requirements of a general low-scattering target test. For the embedded part of the tested object, as shown in fig. 6, 7 and 9, the height difference margin delta H between the bottom of the carrier and the bottom of the embedded part is 5 mm-10 mm, the height H1 of the tail end point of the carrier is not more than H, so that the tail end point is prevented from contacting with the turntable when the carrier is installed on the turntable, and the tail end point is exposed in an electromagnetic wave illumination area to introduce sharp point scattering during testing.
In order to better realize the scheme, the height H of the carrier is determined according to the height of the embedded part of the part to be tested, and the Delta H is 5 mm-10 mm, or the range of the part without the embedded part H is 60 mm-80 mm.
In order to better realize the scheme, further, as shown in FIGS. 6, 7 and 9, the height H1 of the tail end point of the carrier is less than or equal to H.
In order to better realize the scheme, furthermore, the curvature at the butt joint part is continuous along the curved surface in the length direction of the carrier, and the curvature at the butt joint part of the curved surface in the length direction of the carrier is kept continuous, so that the traveling wave scattering caused by surface discontinuity is avoided.
Example 3:
a method for testing a low scattering carrier with both horizontal and vertical polarization, as shown in fig. 1, for testing a low scattering carrier with both horizontal and vertical polarization as described in the above embodiment 1 or embodiment 2, comprising the following steps in sequence:
first, the installation before testing was performed:
step S1: the carrier head is just opposite to the incident direction of the electromagnetic wave, as shown in fig. 10;
step S2: placing a test target to be tested into a flange interface 4 on the upper curved surface 1 of the carrier, and enabling the edge of a cover plate of the test target to be parallel to the edge of the carrier, as shown in fig. 5, enabling the wave crests of traveling waves formed by the edge of the cover plate and the edge of the carrier to coincide when electromagnetic waves are vertically polarized and incident;
step S3: after the test target is installed, detection ensures that when the carrier is placed on the rotary table, the end point of the tail of the carrier does not contact the rotary table, so that sharp point scattering caused by exposure to an electromagnetic wave illumination area during testing is avoided;
then, horizontal and vertical polarization tests are respectively performed, wherein the horizontal polarization test is as shown in fig. 11:
step S4: when electromagnetic waves are incident at an incident angle of 0 degrees under horizontal polarization, the surface of the carrier is parallel to the electric field, and traveling wave current cannot occur;
because the edge of the carrier forms a certain angle included angle with the electric field, the edge of the carrier can generate traveling wave current, when the edge suddenly changes, the carrier can generate reflection to form traveling wave scattering of the edge, and because the carrier backwards forms a sharp angle thetaeMore than or equal to 2 (alpha + delta), trailing edge traveling wave dispersionThe included angle between the wave crest and the 0-degree incidence direction is more than or equal to alpha + delta and is positioned outside the forward RCS key reduction area;
wherein the vertical polarization test is as shown in FIG. 12:
step S5: electromagnetic waves are incident perpendicularly to the trailing edge of the carrier under vertical polarization due to the backward pointing angle theta of the carriereThe included angle between the trailing edge traveling wave scattering peak and the 0-degree incident position is less than or equal to 90 degrees- (alpha + delta), and the included angle is within the forward RCS reduction key point azimuth angle;
as shown in fig. 13, the tail of the carrier is bent downward, so that the scattering of the traveling wave can be further suppressed, and when the surface wave propagates along the surface of the shape, the radius of curvature of the surface wave is gradually and continuously reduced from large, and no sharp change boundary is formed, and the traveling wave radiates energy along the tangential direction of the traveling wave at any time in the process of propagation, so that the traveling wave can be gradually weakened, and the contribution of the traveling wave is suppressed.
While in testing between horizontal and vertical polarization:
step S6: as shown in FIG. 10, when the carrier is forward pointing at a sharp angle θfNot more than 180-2 (alpha + delta), when the electromagnetic wave is vertically incident to the side edge of the carrier under horizontal polarization and vertical polarization, the included angle between the mirror reflection wave crest and the 0-degree incident direction is not less than alpha + delta and is positioned outside the forward RCS key reduction area.
The steps S4, S5, and S6 may be interchanged in order, or performed simultaneously using three identical carriers.
Fig. 14, 15 and 16 are RCS simulation curves of carriers with geometric parameters within the above value range by using a multilayer fast multipole algorithm, and it can be seen from the graphs that the RCS of the C-band is lower than-35 dBsm, and the RCS of the X-and Ku-bands is lower than-40 dBsm under most azimuth angles, so as to meet the requirements of RCS tests of most antennas and other low-scattering targets.
In this scheme, a method for testing a low scattering carrier with both horizontal and vertical polarization is a method for testing a low scattering carrier with both horizontal and vertical polarization in embodiment 1 or 2, especially a method for testing horizontal and vertical polarization.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (8)
1. A low scattering carrier that is both horizontally and vertically polarized, comprising a carrier, characterized in that: the carrier consists of an upper curved surface (1), a lower curved surface (2) and a transition curved surface (3), the carrier is of a metal hollow structure, is in a water drop shape and is symmetrical with the left and the right axes,
the sharper ends of the two ends of the carrier are head parts, the other ends of the two ends of the carrier are tail parts, the upper curved surface (1) of the carrier close to the head parts is a plane, and the tail parts of the carrier are bent downwards;
the carrier satisfies the forward sharp corner
And a rear pointing angle
；
Wherein,
for forward attention to the angle of the angular domain,
is a margin from the forward angular region of interest, and the angles α and
the angular unit of (a) is degrees.
2. A low scattering carrier with both horizontal and vertical polarization as claimed in claim 1, wherein: the plane part of the upper curved surface (1) is provided with a flange interface (4) in a concave mode, the flange interface (4) is lower than the plane part of the upper curved surface (1), and the upper surface of the mounting seat of the test target is flush with the plane part of the upper curved surface (1) after the mounting seat of the test target is mounted on the flange interface (4).
3. A low scattering carrier with both horizontal and vertical polarization as claimed in claim 1, wherein: the angle alpha of the forward attention angle domain is 45 degrees, the range of the allowance delta deviating from the forward attention angle domain is 5 degrees-10 degrees, and the surface roughness Ra of the carrier is less than or equal to 1.6.
4. A low scattering carrier with both horizontal and vertical polarization as claimed in claim 1, wherein: the length L range of the carrier is 800 mm-1000 mm, and the width W range of the carrier is 600 mm-800 mm.
5. A low scattering carrier with both horizontal and vertical polarization as claimed in claim 1, wherein: the height H of the carrier is determined according to the height of the embedded part of the part to be tested, and delta H =5 mm-10 mm, or the range of the part H without the embedded part is 60 mm-80 mm.
6. A low scattering carrier with both horizontal and vertical polarization as claimed in claim 5, wherein: the height H1 of the tail end point of the carrier is not more than H.
7. A low scattering carrier with both horizontal and vertical polarization as claimed in claim 1, wherein: the curvature of the curved surface along the length of the carrier is continuous at the butt joint.
8. A method for testing a horizontally and vertically polarized low scattering carrier, which comprises the steps of testing a horizontally and vertically polarized low scattering carrier according to any one of claims 1 to 7, wherein: comprises the following steps which are carried out in sequence:
step S1: the head of the carrier is just opposite to the incident direction of the electromagnetic wave;
step S2: placing a test target to be tested into a flange interface (4) on the upper curved surface (1) of the carrier, and enabling the edge of a cover plate of the test target to be parallel to the edge of the carrier, so that the wave crests of traveling waves formed by the edge of the cover plate and the edge of the carrier are overlapped when electromagnetic waves are vertically polarized and incident;
step S3: after the test target is installed, detection ensures that when the carrier is placed on the rotary table, the end point of the tail of the carrier does not contact the rotary table, so that sharp point scattering caused by exposure to an electromagnetic wave illumination area during testing is avoided;
step S4: when electromagnetic waves are incident at an incident angle of 0 degrees under horizontal polarization, the surface of the carrier is parallel to the electric field, and traveling wave current cannot occur;
step S5: electromagnetic waves are incident perpendicular to the trailing edge of the carrier under vertical polarization due to the backward sharp corner of the carrier
Angle between trailing edge traveling wave scattering peak and 0 degree incidence azimuth
Within the azimuth angle of the forward RCS reduction key point, the tail of the carrier is bent downwards, so that the traveling wave scattering can be further inhibited, and the curvature radius of the surface wave is gradually and continuously reduced from large when the surface wave is propagated along the surface of the shape;
the steps S4 and S5 can be switched in order or performed simultaneously using two identical carriers.
Priority Applications (1)
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| CN112798560B (en) * | 2020-12-24 | 2023-05-23 | 中国航空工业集团公司西安飞机设计研究所 | Carrier for estimating scattering characteristics of inner wall of cavity |
| CN112834997B (en) * | 2021-01-07 | 2023-08-18 | 中国航发沈阳发动机研究所 | Low-scattering carrier appearance design method with rectangular opening characteristic |
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| CN114355311B (en) * | 2022-03-10 | 2022-08-12 | 成都飞机工业（集团）有限责任公司 | Low-scattering carrier for RCS (Radar Cross section) test of airfoil leading edge wave-absorbing structure and test method |
| CN116629109B (en) * | 2023-05-16 | 2024-05-24 | 中国电子科技集团公司第五十四研究所 | Low-scattering carrier optimization design method |
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