EP4274026A1 - Anti-aliasing rotary dislocation array antenna - Google Patents
Anti-aliasing rotary dislocation array antenna Download PDFInfo
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- EP4274026A1 EP4274026A1 EP22734742.4A EP22734742A EP4274026A1 EP 4274026 A1 EP4274026 A1 EP 4274026A1 EP 22734742 A EP22734742 A EP 22734742A EP 4274026 A1 EP4274026 A1 EP 4274026A1
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- array antenna
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- 238000005070 sampling Methods 0.000 claims abstract description 23
- 230000035945 sensitivity Effects 0.000 abstract description 10
- 238000001514 detection method Methods 0.000 abstract description 8
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000003384 imaging method Methods 0.000 description 5
- 238000003786 synthesis reaction Methods 0.000 description 5
- 230000005855 radiation Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005305 interferometry Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/061—Two dimensional planar arrays
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/08—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a rectilinear path
Definitions
- the invention relates to the field of passive microwave remote sensing under aperture synthesis system, in particular, to an anti-aliasing rotation dislocation array antenna.
- Aperture synthesis microwave radiation detection as a passive microwave remote sensing technology that obtains target characteristics by receiving microwave energy radiated from the observed scene, is different from the principle of traditional real-aperture radiation detection that directly performs power measurement and imaging. It obtains the high spatial resolution that cannot be achieved due to the limitations on the size of the real-aperture antenna by using large-aperture antennas for equivalent real-aperture detection of multiple small-unit antennas according to a certain array layout (T-type, Y-type, O-type, etc.). Through the interferometry between every two small-unit antennas, the spatial frequency domain of the radiation brightness temperature distribution in the field of view is sampled to obtain the visibility function, and then the brightness temperature images are reconstructed by performing mathematical operations on the visibility function.
- the array layout has a significant impact on the performance of synthesis aperture radiation detection: the maximum length of the array determines the spatial resolution of the system imaging, the minimum unit spacing of the array determines the alias-free field of view of the system imaging, and the system sensitivity is also closely related to the number of array units and the arrangement of array unit intervals.
- the performance in sampling the visibility function of different array layouts is different, and the impact on the imaging performance of the system is also different. Therefore, the optimal design of the array layout must comprehensively consider various factors such as system performance indicators (resolution, sensitivity, field of view, etc.) and realizability of the hardware.
- the technical objective of the invention is to provide an anti-aliasing rotation dislocation array antenna, so as to solve the technical problems of serious aliasing and low sensitivity.
- the invention uses the following technical solutions:
- distances between the antenna units of the second sub-array antenna and the antenna units of the first sub-array antenna close to both ends of the first sub-array antenna and between the antenna units of the third sub-array antenna and the antenna units of the first sub-array antenna close to both ends of the first sub-array antenna are ⁇ u .
- N V 8 N 2 + 8 N + 1.
- the invention has the following advantages and positive effects due to the adoption of the above technical solutions:
- an array antenna is obtained to achieve dislocated sampling of the visibility function
- the anti-aliasing rotation dislocation array antenna is obtained by rotating the array antenna by 45° to achieve dislocated sampling and rotation of the grids, so that the invention densifies the number of sampling points of the visibility function, and increases the detection area without aliasing and improve the detection sensitivity of the system, thereby widening the inversion imaging area and improving the clarity of the inversion image.
- the embodiment provides an anti-aliasing rotation dislocation array antenna, and how it is obtained will now be described in detail.
- the spacing 1 in the coordinate system represents 1 ⁇ ⁇ u .
- the spacing between several adjacent antenna units is ⁇ u
- the U-shaped array includes three sides composed of antenna units, and each side is a straight line and two adjacent sides are perpendicular to each other.
- the U-shaped array is now divided into a first sub-array antenna, a second sub-array antenna and a third sub-array antenna, wherein the first sub-array antenna is a bottom side of the U-shaped array and includes N+1 antenna units, and the second sub-array antenna and the third sub-array antenna both include N antenna units, N being a positive integer.
- x-coordinates of the antenna units of the second sub-array antenna are consistent and both are 0, and x-coordinates of the antenna units of the third sub-array antenna are consistent and both are 8.
- sampling of a standard rectangular grid is formed, a view of the sampling of the visibility function of the standard rectangular grid is shown in Fig. 4 .
- a sampling spacing of the standard rectangular grid is ⁇ u
- the total number of sample points of N v 1 4 N 2 + 4 N + 1.
- the fourth sub-array antenna is added at an opening in the above U-shaped array layout; the number of the antenna units of the fourth sub-array antenna is N, the antenna units are arranged in a straight line with the spacing of ⁇ u , and the fourth sub-array antenna is perpendicular to the first sub-array antenna.
- coordinates of the antenna units at both ends of the fourth sub-array antenna are (0.5, 8.5), (7.5, 8.5) respectively, i.e., a distance between antenna units at both ends of the fourth sub-array antenna and the antenna unit of the nearest second sub-array antenna, and between the antenna units at both ends of the fourth sub-array antenna and the antenna unit of the third sub-array antenna is 2 2 ⁇ u .
- the above antenna units in the first sub-array antenna, the second sub-array antenna, the third sub-array antenna and the fourth sub-array antenna are rotated counterclockwise by 45°, then the anti-aliasing rotation dislocation array antenna of the embodiment is obtained.
- an interval of the rotation dislocation array layout of the embodiment is 2 2 ⁇ u , with corresponding aliasing-free field of view shown in Fig. 7 ; by comparison, the range of aliasing-free field of view is expanded by 2 times.
- sensitivity is an important index to measure the effect of remote sensing, which reflects the minimum detectable degree of brightness temperature changes of each pixel in the image, and is expressed as the clarity of the inverted images, thereby providing beneficial help for subsequent extraction of required information from images.
- the sensitivity ⁇ T is proportional to the product of the square root N v of the minimum unit area ⁇ s of the visibility sampling plane and the number of sample points of the visibility function.
- MATLAB software is used for inversion simulation.
- Fig. 9 is the optical image of the scene
- Fig. 11 is the inversion image of the U-shaped array layout using inverse Fourier transform
- Fig. 10 is an inversion image based on the array layout of the embodiment using inverse Fourier transform. It can be seen that the inversion image based on the new layout of the embodiment reflects more detailed information, the outline is clearer, and the performance is better.
- the spacing between antenna units is 2 times that of the U-shaped layout.
- the new layout may greatly reduce the number of units, and reduce the design and engineering requirements for unit antennas.
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- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
Disclosed is an anti-aliasing rotation dislocation array antenna. A first sub-array, a second sub-array and a third sub-array are in a U-shaped layout, and the second sub-array is parallel to the third sub-array. The first sub-array is perpendicular to the second and the third sub-array, and the first sub-array is arranged at 45° to a positive direction of both x-axis and y-axis of the coordinate system. The fourth sub-array is parallel to the first sub-array. Distances between the units of the fourth sub-array at both ends with the unit of the second and the third sub-array at one end away from the first sub-array are 22Δu. The invention densifies the number of sampling points of the visibility function, increases the detection area without aliasing and improves the system sensitivity.
Description
- The invention relates to the field of passive microwave remote sensing under aperture synthesis system, in particular, to an anti-aliasing rotation dislocation array antenna.
- Aperture synthesis microwave radiation detection, as a passive microwave remote sensing technology that obtains target characteristics by receiving microwave energy radiated from the observed scene, is different from the principle of traditional real-aperture radiation detection that directly performs power measurement and imaging. It obtains the high spatial resolution that cannot be achieved due to the limitations on the size of the real-aperture antenna by using large-aperture antennas for equivalent real-aperture detection of multiple small-unit antennas according to a certain array layout (T-type, Y-type, O-type, etc.). Through the interferometry between every two small-unit antennas, the spatial frequency domain of the radiation brightness temperature distribution in the field of view is sampled to obtain the visibility function, and then the brightness temperature images are reconstructed by performing mathematical operations on the visibility function.
- The array layout has a significant impact on the performance of synthesis aperture radiation detection: the maximum length of the array determines the spatial resolution of the system imaging, the minimum unit spacing of the array determines the alias-free field of view of the system imaging, and the system sensitivity is also closely related to the number of array units and the arrangement of array unit intervals. The performance in sampling the visibility function of different array layouts is different, and the impact on the imaging performance of the system is also different. Therefore, the optimal design of the array layout must comprehensively consider various factors such as system performance indicators (resolution, sensitivity, field of view, etc.) and realizability of the hardware.
- The technical objective of the invention is to provide an anti-aliasing rotation dislocation array antenna, so as to solve the technical problems of serious aliasing and low sensitivity.
- In order to solve the problems, the invention uses the following technical solutions:
- An anti-aliasing rotation dislocation array antenna is provided, the anti-aliasing rotation dislocation array antenna being distributed in a staggered manner based on a coordinate system for determining a spatial position of the anti-aliasing rotation dislocation array antenna, the anti-aliasing rotation dislocation array antenna comprising a first sub-array antenna, a second sub-array antenna, a third sub-array antenna and a fourth sub-array antenna;
- the first sub-array antenna comprises N+1 antenna elements arranged at an equal interval Δu in a straight line;
- the second sub-array antenna comprises N antenna elements arranged at an equal interval Δu in a straight line;
- the third sub-array antenna comprises N antenna elements arranged at an equal interval Δu in a straight line;
- the fourth sub-array antenna comprises N antenna elements arranged at an equal interval Δu in a straight line;
- wherein the first sub-array antenna, the second sub-array antenna and the third sub-array antenna are in a U-shaped layout, and the second sub-array antenna is parallel to the third sub-array antenna; the first sub-array antenna is perpendicular to the second sub-array antenna and the third sub-array antenna respectively, and the first array antenna is arranged at 45° to a positive direction of an x-axis of the coordinate system and 45° to a positive direction of a y-axis of the coordinate system;
- the fourth sub-array antenna is parallel to the first sub-array antenna; distances between the antenna units of the fourth sub-array at both ends of the fourth sub-array antenna and the antenna unit at one end of the second sub-array antenna away from the first sub-array antenna, and between the antenna units of the fourth sub-array antenna at both ends of the fourth sub-array antenna and the antenna unit of the third sub-array antenna at one end of the third sub-array antenna away from the first sub-array antenna are
- Specifically, distances between the antenna units of the second sub-array antenna and the antenna units of the first sub-array antenna close to both ends of the first sub-array antenna and between the antenna units of the third sub-array antenna and the antenna units of the first sub-array antenna close to both ends of the first sub-array antenna are Δu.
- Specifically, a formula for the total number of sample points NV of a visibility function of the anti-aliasing rotation dislocation array antenna is as follows: Nv = 8N 2 + 8N + 1.
-
- Compared with the prior art, the invention has the following advantages and positive effects due to the adoption of the above technical solutions:
Through the reasonable layout of the antenna units, an array antenna is obtained to achieve dislocated sampling of the visibility function, and the anti-aliasing rotation dislocation array antenna is obtained by rotating the array antenna by 45° to achieve dislocated sampling and rotation of the grids, so that the invention densifies the number of sampling points of the visibility function, and increases the detection area without aliasing and improve the detection sensitivity of the system, thereby widening the inversion imaging area and improving the clarity of the inversion image. - By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only used for the purpose of illustrating the preferred embodiments, and are not considered as a limitation to the invention.
-
Fig. 1 is a view of an array layout of an anti-aliasing rotation dislocation array antenna according to the invention; -
Fig. 2 is a view of the sampling of a visibility function corresponding to the array layout based onFig. 1 ; -
Fig. 3 is a view of a U-shaped array layout; -
Fig. 4 is a view of the sampling of a visibility function of a standard rectangular grid corresponding to the array layout based onFig. 3 ; -
Fig. 5 is a view of a layout of adding a dislocated unit arm in the U-shaped array; -
Fig. 6 is a view of the sampling of a visibility function corresponding to the array layout based onFig. 5 ; -
Fig. 7 is a view of an aliasing-free field of view of the new array layout acquired based onFig. 1 ; -
Fig. 8 is a view of an aliasing-free field of view of a standard rectangular array acquired based onFig. 3 ; -
Fig. 9 is an optical image of a certain scene; -
Fig. 10 is an inversion image acquired through the array layout of the invention based onFig. 9 ; -
Fig. 11 is an inversion image acquired through the U-shaped array layout based onFig. 9 . - In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the specific implementation manners of the invention will be described below with reference to the accompanying drawings. Obviously, the drawings below are only some examples of the invention, and the ordinary artisans concerned may obtain other drawings on the basis of these drawings without making creative efforts and other embodiments.
- In order to make the drawing concise, each drawing only schematically shows the parts related to the invention, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, only one of the components having the same structure or function is schematically shown, or only one of them is marked. Herein, "a" not only means "only one", but also means "more than one".
- An anti-aliasing rotation dislocation array antenna proposed by the invention will be further described in combination with drawings and embodiments. Advantages and features of the invention will be apparent from the following description and claims.
- As shown in
Fig. 1 and Fig.2 , the embodiment provides an anti-aliasing rotation dislocation array antenna, and how it is obtained will now be described in detail. - As shown in
Fig. 3 , in the embodiment, first, several antenna units need to be placed in a coordinate system according to a U-shaped layout array, wherein the coordinate system is only for intuitively viewing the positional relationship of the antenna units, and has nothing to do with practical applications. Thespacing 1 in the coordinate system represents 1∗Δu. Specifically, the spacing between several adjacent antenna units is Δu, the U-shaped array includes three sides composed of antenna units, and each side is a straight line and two adjacent sides are perpendicular to each other. The U-shaped array is now divided into a first sub-array antenna, a second sub-array antenna and a third sub-array antenna, wherein the first sub-array antenna is a bottom side of the U-shaped array and includes N+1 antenna units, and the second sub-array antenna and the third sub-array antenna both include N antenna units, N being a positive integer. As shown inFig. 3 , combined with the coordinate system, x-coordinates of the antenna units of the second sub-array antenna are consistent and both are 0, and x-coordinates of the antenna units of the third sub-array antenna are consistent and both are 8. Based on the above U-shaped array layout, sampling of a standard rectangular grid is formed, a view of the sampling of the visibility function of the standard rectangular grid is shown inFig. 4 . A sampling spacing of the standard rectangular grid is Δu, a minimum unit area Δs = Δu 2 of a sampling plane of the visibility function is Δs = Δu 2, with the total number of sample points of N v1 = 4N 2 + 4N + 1. - Next, as shown in
Fig. 5 , in the embodiment, the fourth sub-array antenna is added at an opening in the above U-shaped array layout; the number of the antenna units of the fourth sub-array antenna is N, the antenna units are arranged in a straight line with the spacing of Δu, and the fourth sub-array antenna is perpendicular to the first sub-array antenna. Combined with the coordinate system, coordinates of the antenna units at both ends of the fourth sub-array antenna are (0.5, 8.5), (7.5, 8.5) respectively, i.e., a distance between antenna units at both ends of the fourth sub-array antenna and the antenna unit of the nearest second sub-array antenna, and between the antenna units at both ends of the fourth sub-array antenna and the antenna unit of the third sub-array antenna isFig. 6 ; the total number of samples of the visibility function is N v2 = 8N2 + 8N + 1. - As shown in
Fig. 1 , finally, combined with the coordinate system, with the coordinate point (0, 0) as an origin of rotation, the above antenna units in the first sub-array antenna, the second sub-array antenna, the third sub-array antenna and the fourth sub-array antenna are rotated counterclockwise by 45°, then the anti-aliasing rotation dislocation array antenna of the embodiment is obtained. The rotation dislocated grid sampling is formed by this arrangement, with a specific view of sampling of the visibility function shown inFig. 6 ; a sampling spacing of the visibility function is - The anti-aliasing capabilities of the U-shaped array layout and the array layout of the embodiment are now compared. According to the relationship between the synthesis aperture sampling interval Δl and the aliasing-free field of view, if a range of the aliasing-free field of view is |ξmin, ξmax |, a condition for aliasing-free in the field of view is
Fig. 8 ; an interval of the rotation dislocation array layout of the embodiment isFig. 7 ; by comparison, the range of aliasing-free field of view is expanded by - As shown in
Figs. 9 to 11 , in order to further illustrate the performance of the embodiment, the clarities of the inversion for the images of the same scene performed by the embodiment and the U-shaped array layout are described. In the field of microwave remote sensing, sensitivity is an important index to measure the effect of remote sensing, which reflects the minimum detectable degree of brightness temperature changes of each pixel in the image, and is expressed as the clarity of the inverted images, thereby providing beneficial help for subsequent extraction of required information from images. According to the relationship formulaFig. 9 is the optical image of the scene,Fig. 11 is the inversion image of the U-shaped array layout using inverse Fourier transform, andFig. 10 is an inversion image based on the array layout of the embodiment using inverse Fourier transform. It can be seen that the inversion image based on the new layout of the embodiment reflects more detailed information, the outline is clearer, and the performance is better. - As a supplementary note, if the alias-free field of view required by the system detection is certain, in the dislocation layout corresponding to the embodiment, the spacing between antenna units is
- The implementations of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above implementations. Even if various changes are made to the invention, if these changes fall within the scope of the claims of the invention and equivalent technologies, they still fall within the protection scope of the invention.
Claims (4)
- An anti-aliasing rotation dislocation array antenna, the anti-aliasing rotation dislocation array antenna being distributed in a staggered manner based on a coordinate system for determining a spatial position of the anti-aliasing rotation dislocation array antenna, the anti-aliasing rotation dislocation array antenna comprising a first sub-array antenna, a second sub-array antenna, a third sub-array antenna, and a fourth sub-array antenna;the first sub-array antenna comprises N+1 antenna units arranged at an equal interval Δu in a straight line, N being a positive integer;the second sub-array antenna comprises N antenna units arranged at an equal interval Δu in a straight line;the third sub-array antenna comprises N antenna units arranged at an equal interval Δu in a straight line;the fourth sub-array antenna comprises N antenna units arranged at an equal interval Δu in a straight line;wherein the first sub-array antenna, the second sub-array antenna, and the third sub-array antenna are in a U-shaped layout, and the second sub-array antenna is parallel to the third sub-array antenna; the first sub-array antenna is perpendicular to the second sub-array antenna and the third sub-array antenna respectively, and the first array antenna is arranged at 45° to a positive direction of an x-axis of the coordinate system and 45° to a positive direction of a y-axis of the coordinate system;the fourth sub-array antenna is parallel to the first sub-array antenna; distances between the antenna units of the fourth sub-array at both ends of the fourth sub-array antenna and the antenna unit of the second sub-array antenna at one end of the second sub-array antenna away from the first sub-array antenna, and between the antenna units of the fourth sub-array antenna at both ends of the fourth sub-array antenna and the antenna unit of the third sub-array antenna at one end of the third sub-array antenna away from the first sub-array antenna are
- The anti-aliasing rotation dislocation array antenna according to claim 1, wherein distances between the antenna units of the second sub-array antenna and the antenna units of the first sub-array antenna close to both ends of the first sub-array antenna and between the antenna units of the third sub-array antenna and the antenna units of the first sub-array antenna close to both ends of the first sub-array antenna are Δu.
- The anti-aliasing rotation dislocation array antenna according to claim 1, wherein a formula for the total number of sample points NV of a visibility function of the array layout is as follows: Nv = 8N2 + 8N + 1.
Applications Claiming Priority (2)
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CN202110003955.2A CN112768955B (en) | 2021-01-04 | 2021-01-04 | Anti-aliasing rotation dislocation array antenna |
PCT/CN2022/070029 WO2022144017A1 (en) | 2021-01-04 | 2022-01-04 | Anti-aliasing rotary dislocation array antenna |
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CN112768955B (en) * | 2021-01-04 | 2022-12-13 | 上海航天测控通信研究所 | Anti-aliasing rotation dislocation array antenna |
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JP3912777B2 (en) * | 2002-04-24 | 2007-05-09 | 三菱電機株式会社 | Array antenna device |
WO2011065876A1 (en) * | 2009-11-25 | 2011-06-03 | Saab Ab | Array antenna system |
CN101841084A (en) * | 2010-04-30 | 2010-09-22 | 北京航空航天大学 | 8-millimeter waveband synthetic aperture radiometer antenna array layout method capable of relieving aliasing |
CN101975947B (en) * | 2010-10-22 | 2012-07-04 | 华中科技大学 | Two-dimensional radial imaging method for mirror image synthetic aperture |
US8937570B2 (en) * | 2012-09-28 | 2015-01-20 | Battelle Memorial Institute | Apparatus for synthetic imaging of an object |
CN103985970A (en) * | 2014-04-28 | 2014-08-13 | 零八一电子集团有限公司 | Distribution method capable of restraining grating lobes of large-space phased-array antenna |
CN104467947B (en) * | 2014-12-18 | 2018-07-10 | 中国电子科技集团公司第三十八研究所 | Helicopter platform satellite communication terminal |
CN104808201B (en) * | 2015-04-23 | 2017-09-29 | 中国电子科技集团公司第四十一研究所 | A kind of two-dimentional MIMO array implementation method |
CN106093882B (en) * | 2016-06-02 | 2018-08-31 | 华中科技大学 | Synthetic aperture radiometer array arrangement method of the ring-type based on positive triangle grid |
IL250381A0 (en) * | 2017-01-31 | 2017-03-30 | Arbe Robotics Ltd | A compact radar switch/mimo array antenna with high azimuth and elevation angular resolution |
CN106911010B (en) * | 2017-03-01 | 2020-04-07 | 中国电子科技集团公司第三十八研究所 | Large-unit-spacing phased array antenna based on subarray level |
JP6756300B2 (en) * | 2017-04-24 | 2020-09-16 | 株式会社村田製作所 | Array antenna |
CN109037885B (en) * | 2018-08-17 | 2020-10-20 | 中国电子科技集团公司第三十八研究所 | Satellite-borne SAR phased-array antenna based on subarray dislocation |
CN209342935U (en) * | 2018-12-29 | 2019-09-03 | 清华大学 | Rays safety detection apparatus |
CN110492252B (en) * | 2019-08-23 | 2021-01-05 | 西北核技术研究院 | Array antenna with large scanning angle and design method thereof |
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CN112768955B (en) * | 2021-01-04 | 2022-12-13 | 上海航天测控通信研究所 | Anti-aliasing rotation dislocation array antenna |
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