CN108987937B - Method and device for designing bifocal shaped reflector antenna - Google Patents
Method and device for designing bifocal shaped reflector antenna Download PDFInfo
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- CN108987937B CN108987937B CN201810562110.5A CN201810562110A CN108987937B CN 108987937 B CN108987937 B CN 108987937B CN 201810562110 A CN201810562110 A CN 201810562110A CN 108987937 B CN108987937 B CN 108987937B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/14—Reflecting surfaces; Equivalent structures
- H01Q15/141—Apparatus or processes specially adapted for manufacturing reflecting surfaces
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/14—Reflecting surfaces; Equivalent structures
- H01Q15/16—Reflecting surfaces; Equivalent structures curved in two dimensions, e.g. paraboloidal
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
- H01Q19/12—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave
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Abstract
The embodiment of the invention discloses a method for a bifocal shaping reflector antenna, which is used for the bifocal shaping reflector antenna, wherein the bifocal shaping reflector antenna comprises a phased array feed source and a shaping reflector; the method comprises the following steps: presetting an shaping reflecting surface as a paraboloid, and determining a curve of an orientation tangent plane and a curve of a distance tangent plane of the shaping reflecting surface; the curve of the azimuth tangent plane and the curve of the distance tangent plane are combined to obtain a curved surface equation of the shape-endowing reflecting surface, and because the azimuth and the distance of the reflecting surface adopt different equations to construct the surface shape of the whole reflecting surface, the reflecting surface antenna can realize the scanning range of the azimuth +/-5-degree distance +/-3-degree, and the antenna has stable gain output in the scanning range. The embodiment of the invention also discloses a device of the bifocal shaped reflector antenna, the bifocal shaped reflector antenna and a computer readable storage medium.
Description
Technical Field
The invention relates to a multi-polarization Synthetic Aperture Radar (SAR) technology in the field of satellite-borne, in particular to a method and a device for a bifocal shaped reflector antenna, the bifocal shaped reflector antenna and a computer readable storage medium.
Background
Multi-polar synthesis of geosynchronous orbitAperture Radar (SAR) antenna Aperture area is 1000m2Above, therefore, a lightweight deployable antenna technology is required. The reflector antenna composed of the phased array feed source and the expandable mesh reflector has the characteristics of relatively simple expansion mechanism, light weight, high efficiency, and capability of realizing space power synthesis and full-power continuous scanning of wave beams, and becomes the mainstream of the large-caliber light expandable antenna in the field of the satellite-borne radar at present, but the wide-angle electric scanning required by SAR staring imaging realized by the phased array feed source reflector antenna has high difficulty.
Disclosure of Invention
In order to solve the above technical problems, embodiments of the present invention provide a method and an apparatus for a bifocal shaped reflector antenna, and a computer-readable storage medium, which can implement a wide-angle scanning capability of a reflector antenna by performing bifocal shaped design on the reflector antenna using an active phased array feed source, thereby providing a strong support for engineering application.
The technical scheme of the invention is realized as follows:
in one aspect, an embodiment of the present invention provides a method for a bifocal shaping reflector antenna, where the method is used for the bifocal shaping reflector antenna, and the bifocal shaping reflector antenna includes a phased array feed source and a shaping reflector; the method comprises the following steps:
presetting an shaping reflecting surface as a paraboloid, and determining a curve of an orientation tangent plane and a curve of a distance tangent plane of the shaping reflecting surface;
and combining the curve of the azimuth tangent plane and the curve of the distance tangent plane to obtain a curved surface equation of the shape-giving reflecting surface.
In the above solution, the determining a curve of the azimuth tangent plane of the shaped reflecting surface includes:
determining a first parameter of the shaping reflecting surface and a first axial position of the feed source, and generating a curve of an azimuth tangent plane of the shaping reflecting surface according to the first parameter and the first axial position of the feed source.
In the above scheme, the determining a first parameter of the shaped reflecting surface and a first axial position of the feed source includes:
setting a single feed source positioned in the axial direction of a paraboloid as an original irradiation source, setting parameters of a shaping reflecting surface as preset parameters, adjusting the axial position of the single feed source, and determining the axial position of the single feed source as an initial axial position when the beam width coverage angle of the single feed source passing through the reflecting surface meets a first preset condition;
arranging a plurality of single feed sources into line feed sources along the azimuth direction at the initial axial position, adjusting the parameters of the forming reflecting surface and the axial position of the line feed sources, determining the parameters of the current forming reflecting surface as second parameters when the beam width coverage angle of each single feed source meets the first preset condition and the fluctuation of the directional diagram of each single feed source in the beam width coverage angle meeting the first preset condition meets the second preset condition, and determining the axial position of the current line feed source as a second axial position;
calculating directional diagram data of each single feed source by adopting a phase-only weighting method to obtain scanning beams of the antenna, adjusting parameters of the forming reflecting surface and the axial position of the line feed source, determining the parameters of the current forming reflecting surface as first parameters and determining the axial position of the current line feed source as a first axial position when the sidelobe level of the directional diagram and the beam width of the scanning beams meet a third preset condition.
In the above scheme, determining a curve of the distance between the shaping reflecting surface and the tangent plane includes:
and performing offset feed setting on the reflecting surface in the distance direction, adjusting the focal length parameter of the parabola, determining the focal length parameter of the parabola as the optimal focal length parameter when the scanning angle of the antenna in the distance direction meets a fourth preset condition, and generating a curve of the distance direction tangent plane according to the optimal focal length parameter.
In the foregoing scheme, the adjusting the parameter of the shaping reflective surface and the axial position of the line feed source, when the sidelobe level of the directional diagram and the beam width of the scanning beam satisfy a third preset condition, determining that the parameter of the current shaping reflective surface is the first parameter, and determining that the axial position of the current line feed source is the first axial position includes:
and adjusting the surface type of a shaping reflecting surface of the feed source, the axial position of a linear feed source, the arrangement interval of the feed source and the length of the feed source, determining the surface type of the current shaping reflecting surface, the arrangement interval of the feed source and the length of the feed source as first parameters of the shaping reflecting surface when the sidelobe level of the directional diagram and the beam width of the scanning beam meet a third preset condition, and determining the axial position of the current linear feed source as a first axial position.
In the above scheme, after the combining the curve of the azimuth tangent plane and the curve of the distance tangent plane to obtain the curved surface equation of the shape-giving reflecting surface, the method further includes:
and calculating typical wave beams of the antenna surface type based on the curved surface equation of the shaping reflecting surface, and verifying the performance of the antenna.
In one aspect, an embodiment of the present invention further provides an apparatus for a bifocal reflective surface antenna, where the apparatus includes: a determination unit and a processing unit, wherein,
the determining unit is used for presetting an shaping reflecting surface as a paraboloid and determining a curve of an orientation tangential plane and a curve of a distance tangential plane of the shaping reflecting surface;
and the processing unit is used for combining the curve of the azimuth tangent plane and the curve of the distance tangent plane to obtain a curved surface equation of the shape-giving reflecting surface.
In one aspect, an embodiment of the present invention further provides a bifocal reflective surface antenna, including: phased array feed source, shaping reflecting surface; the phased array feed source generates a beam with scanning capability, and the beam with scanning capability passes through the shaping reflecting surface to realize large-angle scanning of the reflecting surface antenna.
In the above scheme, the phased array feed source is placed at an offset feed position.
In one aspect, embodiments of the present invention also provide a computer-readable storage medium storing one or more programs, which are executable by one or more processors to implement the steps of the method as described in any one of the above.
The embodiment of the invention provides a method and a device for a bifocal shaped reflector antenna, the bifocal shaped reflector antenna and a computer readable storage medium, which can well utilize an active phased array feed source, realize the wide-angle scanning capability of the reflector antenna by carrying out bifocal shaped design on the reflector antenna, and further provide powerful support for the engineering application aspect of the reflector antenna. Compared with the conventional reflector antenna, the beam width of the shaped single reflector antenna can cover +/-5 degrees of azimuth and +/-3 degrees of azimuth so as to meet the requirement of a large scanning angle of the antenna azimuth.
Drawings
Fig. 1 is a schematic flow chart of a method for forming a reflector antenna with dual focal points according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a feed source structure provided by an embodiment of the present invention;
FIG. 3 is a top view of a bifocal reflective surface provided in accordance with an embodiment of the present invention;
FIG. 4 is a side view of a bifocal reflective surface provided by an embodiment of the present invention;
fig. 5 illustrates antenna normal beam information provided by an embodiment of the present invention;
fig. 6 shows beam information of an antenna oriented toward 5 ° and 0 ° according to an embodiment of the present invention;
fig. 7 shows beam information of the antenna oriented toward 0 ° and 3 ° according to an embodiment of the present invention;
fig. 8 shows the information of beams from the antenna direction to 5 ° and from the antenna direction to 3 ° according to the embodiment of the present invention;
fig. 9 is a schematic structural diagram of an apparatus of a bifocal reflective surface antenna according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
An embodiment of the present invention provides a method for forming a reflector antenna with two focuses, as shown in fig. 1, the method may include:
Specifically, the method provided by the embodiment of the present invention may be applied to a bifocal shaped reflector antenna, where the bifocal shaped reflector antenna at least includes: phased array feed source and shaping reflecting surface.
For example, the design of the two-dimensional planar active phased array feed source can be as shown in fig. 2, and the feed source adopts a design of cutting a square into an octagon to achieve the performance of the scanning beam required to be provided. The two-dimensional electronic scanning capability of the wave beam can be realized under the condition that the antenna is not mechanically rotated, and the flexibility is improved. Meanwhile, the engineering easy implementation provides powerful guarantee for the whole structural design and stability of the reflector antenna. The active phased array feed parameters of fig. 2 are shown in the table below, where the cell spacing is the distance between two adjacent single feeds.
TABLE 1 active phased array feed source parameter table
| Feed source size | 1920mm×1920mm |
| Cell pitch | 30mm×30mm |
| Number of cells (AZ X EL) | 64×64 |
| Unit arrangement mode | Rectangular grid |
| Center frequency | 5.4GHz |
In one possible implementation, the determining the curve of the azimuth tangent plane of the shaped reflecting surface includes: determining a first parameter of the shaping reflecting surface and a first axial position of the feed source, and generating a curve of an azimuth tangent plane of the shaping reflecting surface according to the first parameter and the first axial position of the feed source.
Specifically, determining a first parameter of a shaped reflecting surface and a first axial position of a feed source comprises the following steps:
setting a single feed source positioned in the axial direction of a paraboloid as an original irradiation source, setting parameters of a shaping reflecting surface as preset parameters, adjusting the axial position of the single feed source, and determining the axial position of the single feed source as an initial axial position when the beam width coverage angle of the single feed source passing through the reflecting surface meets a first preset condition;
arranging a plurality of single feed sources into line feed sources along the azimuth direction at the initial axial position, adjusting the parameters of the forming reflecting surface and the axial position of the line feed sources, determining the parameters of the current forming reflecting surface as second parameters when the beam width coverage angle of each single feed source meets the first preset condition and the fluctuation of the directional diagram of each single feed source in the beam width coverage angle meeting the first preset condition meets the second preset condition, and determining the axial position of the current line feed source as a second axial position;
calculating directional diagram data of each single feed source by adopting a phase-only weighting method to obtain scanning beams of the antenna, adjusting parameters of the forming reflecting surface and the axial position of the line feed source, determining the parameters of the current forming reflecting surface as first parameters and determining the axial position of the current line feed source as a first axial position when the sidelobe level of the directional diagram and the beam width of the scanning beams meet a third preset condition.
Here, the fact that the beam width coverage angle of the single feed source after passing through the reflecting surface meets the first preset condition can be understood that the beam width coverage angle of the single feed source after passing through the reflecting surface is ± 5 ° so as to meet the requirement of ± 5 ° for the azimuth scanning of the antenna. The initial axial position is the axial position of the single feed source when the beam width of the single feed source passes through the reflecting surface covers +/-5 degrees.
Specifically adjusting the parameters of the shaping reflecting surface and the axial position of the line feed source, when the sidelobe level of the directional diagram and the beam width of the scanning beam meet a third preset condition, determining that the parameters of the current shaping reflecting surface are first parameters, and determining that the axial position of the current line feed source is a first axial position, including:
and adjusting the surface type of a shaping reflecting surface of the feed source, the axial position of a linear feed source, the arrangement interval of the feed source and the length of the feed source, determining the surface type of the current shaping reflecting surface, the arrangement interval of the feed source and the length of the feed source as first parameters of the shaping reflecting surface when the sidelobe level of the directional diagram and the beam width of the scanning beam meet a third preset condition, and determining the axial position of the current linear feed source as a first axial position.
In one possible implementation, determining a distance profile of the shaped reflecting surface from the tangential plane includes:
and performing offset feed setting on the reflecting surface in the distance direction, adjusting the focal length parameter of the parabola, determining the focal length parameter of the parabola as the optimal focal length parameter when the scanning angle of the antenna in the distance direction meets a fourth preset condition, and generating a curve of the distance direction tangent plane according to the optimal focal length parameter.
And 102, combining the curve of the azimuth tangent plane and the curve of the distance tangent plane to obtain a curved surface equation of the shaping reflecting surface.
Further, after the curve of the azimuth tangent plane and the curve of the distance tangent plane are combined to obtain a curved surface equation of the shape-giving reflecting surface, the method further includes:
and calculating typical wave beams of the antenna surface type based on the curved surface equation of the shaping reflecting surface, and verifying the performance of the antenna.
Exemplary bifocal shaped reflector designs are described in detail below.
The method comprises the steps of taking a paraboloid as a base, taking a single feed source located in the axial direction of the paraboloid as an original irradiation source, enabling the beam width of the feed source after passing through a reflecting surface to cover +/-5 degrees by optimizing the axial position of the feed source so as to meet the requirement of scanning +/-5 degrees in the azimuth direction of an antenna, determining the initial axial position of the feed source, namely adjusting the axial position of the single feed source, and determining the axial position of the single feed source as the initial axial position when the beam width coverage angle of the single feed source after passing through the reflecting surface meets a first preset condition.
In the axial position in the last step, namely the initial axial position, the feed sources are arranged into line feed sources along the azimuth direction, the beam width of each feed source can cover +/-5 degrees by optimizing the parameters of the shaping surface and adjusting the axial position of the feed source in a small range, the directional diagram fluctuation of each feed source in +/-5 degrees is minimum to meet the scanning capacity of +/-5 degrees and the low side lobe level requirement, the parameters of the shaping surface and the position of the feed source are determined, namely the parameters of the shaping reflecting surface and the axial position of the line feed source are adjusted, when the beam width covering angle of each single feed source meets a first preset condition, and when the directional diagram of each single feed source in the beam width covering angle meeting the first preset condition meets a second preset condition, the parameters of the current shaping reflecting surface when the first preset condition and the second preset condition are met are determined as second parameters, and when the first preset condition and the second preset condition are met, the axial position of the current line feed source is determined as the fluctuation of the second axial position And (4) placing.
And calculating the scanning beam of the antenna by adopting a phase-only weighting mode for the directional pattern data of each feed source, and verifying the side lobe and the beam width of the directional pattern. The beam width can be determined by optimizing the array spacing and the feed source length of the feed source, namely the beam width can meet a third preset condition by adjusting the array spacing and the feed source length of the feed source, the sidelobe level needs to be optimized by adjusting the axial positions of the surface type and the feed source, namely the sidelobe level can meet the third preset condition by adjusting the surface type of the shaping reflecting surface of the feed source and the axial position of the linear feed source.
And performing offset feed design on the reflecting surface in the distance direction, optimizing the optimal focal length parameter of the parabola to meet the requirements of the scanning capability and low side lobe of the distance direction of +/-3 degrees, namely, adjusting the focal length parameter of the parabola to enable the scanning angle of the distance direction of the antenna to meet a fourth preset condition, and determining the focal length parameter of the parabola to be the optimal focal length parameter when the fourth preset condition is met.
Combining the curves of the two tangent planes to form a total curved surface equation; and then, calculating typical wave beams of the whole antenna surface type, and verifying the performance of the antenna, namely combining the curve of the azimuth tangent plane and the curve of the distance tangent plane to obtain a curved surface equation of the shaping reflecting surface.
The method is adopted for calculation, and the antenna topological configuration is preliminarily determined according to the overall constraint condition of the antenna, so that the antenna topological configuration has good performance.
The surface type of the single reflecting surface is a shaping surface, and the equation of the reflecting surface is as follows:
wherein, F1＝10.9，F29.5, k 0.05, a 1.2, wherein F1、F2The focal length of the bifocal reflecting surface is shown, k is a telescopic factor, a is a curvature factor, and the caliber AZ multiplied by EL of the reflecting surface is as follows: 24m 22 m. The distance between the feed source and the vertex of the shaping surface is 10 m. The antenna structure parameters are defined as shown in fig. 3 and fig. 4.
In order to enable the two-dimensional scanning capability of the reflector antenna to meet the technical index requirements in engineering application, the azimuth direction and the distance direction of the reflector are shaped by adopting different curves respectively to obtain a two-dimensional shaping equation of the reflector, and the reflector is ensured to obtain different beam scanning capabilities in two dimensions.
Analyzing the performance of the reflector antenna obtained by the method, wherein the directional diagram of the antenna beam pointing to the normal direction is shown in figure 5; the antenna beam is directed to the azimuth direction of 5 degrees, and the distance direction of 0 degrees is shown in figure 6; the antenna beam is directed to the azimuth direction 0 degrees, and the distance direction 3 degrees directional diagrams are shown in figure 7; the antenna beam is directed to a 5-azimuth and a 3-range directional pattern as shown in fig. 8.
The directivity coefficients of the antenna at different scanning angles are shown in table 2 below, where the horizontal axis angle in table 2 is the distance direction and the vertical axis angle is the azimuth direction. As can be seen from table 2, the variation of the directivity coefficient is small with the variation of the scan angle.
TABLE 2
The beam width of the antenna in the azimuth direction is changed with the scanning angle as shown in table 3 below, and the angle of the horizontal axis in table 3 is the distance direction and the angle of the vertical axis is the azimuth direction. As can be seen from table 3, the change in antenna azimuth beam width is small with the change in scan angle.
TABLE 3
The beam width in the antenna direction varies with the scanning angle as shown in table 4 below, where the horizontal axis angle in table 4 is the distance direction and the vertical axis angle is the azimuth direction. As can be seen from table 4, the antenna distance has little change to the beam width with a change in the scan angle.
TABLE 4
The variation of the antenna azimuth sidelobe level with the scan angle is shown in table 5 below, where the horizontal axis angle in table 5 is the distance direction and the vertical axis angle is the azimuth direction. As can be seen from table 5, the variation of the antenna azimuth sidelobe level is small with the variation of the scan angle.
TABLE 5
The variation of the antenna distance direction side lobe level with the scanning angle is shown in table 6 below, where the horizontal axis angle in table 6 is the distance direction and the vertical axis angle is the azimuth direction. As can be seen from table 6, the antenna distance changes little to the side lobe level with a change in the scan angle.
TABLE 6
As can be seen from the above tables, the variation of the directivity coefficient, the azimuth beam width, the range beam width, the azimuth sidelobe level, and the range sidelobe level is small as the scanning angle varies. In conclusion, the bifocal shaped reflector antenna has good wide-angle two-dimensional scanning capability, engineering realizability and can meet design requirements.
The method for forming the reflector antenna with the double focuses can well utilize the active phased array feed source, and realize the wide-angle scanning capability of the reflector antenna by performing the double-focus forming design on the reflector antenna, thereby providing powerful support for the engineering application aspect of the reflector antenna. Compared with the conventional reflector antenna, the beam width of the shaped single reflector antenna can cover +/-5 degrees of azimuth and +/-3 degrees of azimuth so as to meet the requirement of a large scanning angle of the antenna azimuth.
An embodiment of the present invention further provides an apparatus 20 for a bifocal reflector antenna, as shown in fig. 9, the apparatus includes: a determination unit 201 and a processing unit 202, wherein,
the determining unit 201 is configured to preset the shaping reflecting surface as a paraboloid, and determine a curve of an orientation tangential plane and a curve of a distance tangential plane of the shaping reflecting surface;
the processing unit 202 is configured to combine the curve of the azimuth tangent plane and the curve of the distance tangent plane to obtain a curved surface equation of the shape-giving reflecting surface.
Further, the determining unit 201 is specifically configured to determine a first parameter of the shaping reflecting surface and a first axial position of the feed source, and generate a curve of an azimuth tangent plane of the shaping reflecting surface according to the first parameter and the first axial position of the feed source.
Further, the determining unit 201 is specifically configured to:
setting a single feed source positioned in the axial direction of a paraboloid as an original irradiation source, setting parameters of a shaping reflecting surface as preset parameters, adjusting the axial position of the single feed source, and determining the axial position of the single feed source as an initial axial position when the beam width coverage angle of the single feed source passing through the reflecting surface meets a first preset condition;
arranging a plurality of single feed sources into line feed sources along the azimuth direction at the initial axial position, adjusting the parameters of the forming reflecting surface and the axial position of the line feed sources, determining the parameters of the current forming reflecting surface as second parameters when the beam width coverage angle of each single feed source meets the first preset condition and the fluctuation of the directional diagram of each single feed source in the beam width coverage angle meeting the first preset condition meets the second preset condition, and determining the axial position of the current line feed source as a second axial position;
calculating directional diagram data of each single feed source by adopting a phase-only weighting method to obtain scanning beams of the antenna, adjusting parameters of the forming reflecting surface and the axial position of the line feed source, determining the parameters of the current forming reflecting surface as first parameters and determining the axial position of the current line feed source as a first axial position when the sidelobe level of the directional diagram and the beam width of the scanning beams meet a third preset condition.
Further, the determining unit 201 is specifically configured to:
and performing offset feed setting on the reflecting surface in the distance direction, adjusting the focal length parameter of the parabola, determining the focal length parameter of the parabola as the optimal focal length parameter when the scanning angle of the antenna in the distance direction meets a fourth preset condition, and generating a curve of the distance direction tangent plane according to the optimal focal length parameter.
Further, the determining unit 201 is specifically configured to:
and adjusting the surface type of a shaping reflecting surface of the feed source, the axial position of a linear feed source, the arrangement interval of the feed source and the length of the feed source, determining the surface type of the current shaping reflecting surface, the arrangement interval of the feed source and the length of the feed source as first parameters of the shaping reflecting surface when the sidelobe level of the directional diagram and the beam width of the scanning beam meet a third preset condition, and determining the axial position of the current linear feed source as a first axial position.
Further, the processing unit 202 is further configured to perform typical beam calculation on the antenna surface based on the curved surface equation of the shaped reflecting surface, and verify the performance of the antenna.
Specifically, for understanding the apparatus of the bifocal shaped reflector antenna according to the embodiments of the present invention, reference may be made to the description of the method embodiment of the bifocal shaped reflector antenna, and details of the embodiments of the present invention are not repeated herein.
An embodiment of the present invention further provides a bifocal shaped reflector antenna, including: phased array feed source, shaping reflecting surface; the phased array feed source generates a beam with scanning capability, and the beam with scanning capability passes through the shaping reflecting surface to realize large-angle scanning of the reflecting surface antenna.
And the phased array feed source is arranged at an offset feed position.
Embodiments of the present invention also provide a computer readable storage medium storing one or more programs, which are executable by one or more processors to implement the steps of the method as described above.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (7)
1. A design method of a bifocal shaped reflector antenna is characterized in that the method is used for the bifocal shaped reflector antenna, and the bifocal shaped reflector antenna comprises a phased array feed source and a shaped reflector; the method comprises the following steps:
presetting a shaping reflecting surface as a paraboloid, and determining a curve of an orientation tangent plane and a curve of a distance tangent plane of the shaping reflecting surface;
combining the curve of the azimuth tangent plane and the curve of the distance tangent plane to obtain a curved surface equation of the shape-giving reflecting surface;
the determining the curve of the orientation tangent plane of the shaped reflecting surface comprises:
determining a first parameter of the shaped reflecting surface and a first axial position of the feed source;
generating a curve of an azimuth tangent plane of the shaping reflecting surface according to a first parameter of the shaping reflecting surface and a first axial position of the feed source; the first parameters comprise the surface type of the shaped reflecting surface, the arrangement interval of the feed source and the length of the feed source; the first axial position is determined by:
setting single feed sources positioned in the axial direction of a paraboloid as original irradiation sources, calculating directional diagram data of each single feed source by adopting a phase-only weighting method to obtain scanning beams of the antenna, adjusting parameters of the shaping reflecting surfaces and the axial positions of the line feed sources, determining the parameters of the current shaping reflecting surfaces as first parameters and determining the axial positions of the current line feed sources as the first axial positions when the sidelobe levels of the directional diagrams and the beam widths of the scanning beams meet third preset conditions; the third preset condition indicates that the beam width of the antenna can cover directions of +/-5 degrees and +/-3 degrees, and the side lobe level changes weakly along with the change of a scanning angle; the line feed source is obtained by arranging a plurality of single feed sources along the azimuth direction at the initial axial position; setting the single feed source positioned in the axial direction of the paraboloid as an original irradiation source, setting parameters of a shaping reflecting surface as preset parameters, adjusting the axial position of the single feed source, and determining the axial position of the single feed source when the beam width coverage angle of the single feed source passing through the reflecting surface meets a first preset condition; the first preset condition represents that the beam width of the single feed source passing through the reflecting surface covers +/-5 degrees;
the determining the curve of the distance of the shaped reflecting surface to the tangent plane comprises the following steps:
performing offset feedback setting on the reflecting surface in the distance direction, and generating a curve of the distance tangent plane according to the optimal focal length parameter of the parabola; wherein the optimal focal length parameter represents a focusing parameter when the requirements of a scanning capability of a distance direction of +/-3 degrees and low sidelobe can be met.
2. The method of claim 1, wherein the adjusting the parameters of the shaped reflectors and the axial position of the line feed, determining the parameter of the current shaped reflector as the first parameter and determining the axial position of the current line feed as the first axial position when the sidelobe level of the directional diagram and the beam width of the scanned beam satisfy a third preset condition comprises:
and when the sidelobe level of the directional diagram and the beam width of the scanning beam meet a third preset condition, determining the surface type of the current shaping reflecting surface, the arrangement interval of the feed source and the length of the feed source as first parameters of the shaping reflecting surface, and determining the axial position of the current linear feed source as a first axial position.
3. The method of claim 1, further comprising, after the combining the curve of the azimuth tangent plane and the curve of the distance tangent plane to obtain the curve equation of the shaped reflecting surface:
and calculating typical wave beams of the antenna surface type based on the curved surface equation of the shaping reflecting surface, and verifying the performance of the antenna.
4. An apparatus for designing a bifocal shaped reflector antenna, the apparatus comprising: a determination unit and a processing unit, wherein,
the determining unit is used for presetting a shaping reflecting surface as a paraboloid and determining a curve of an orientation tangent plane and a curve of a distance tangent plane of the shaping reflecting surface;
the processing unit is used for merging the curve of the azimuth tangent plane and the curve of the distance tangent plane to obtain a curved surface equation of the shape-giving reflecting surface;
wherein, the determining unit is used for determining the curve of the azimuth tangent plane of the shaped reflecting surface, and comprises:
generating a curve of an azimuth tangent plane of the shaping reflecting surface according to a first parameter of the shaping reflecting surface and a first axial position of the feed source; the first parameters comprise the surface type of the shaped reflecting surface, the arrangement interval of the feed source and the length of the feed source; the first axial position is determined by:
setting single feed sources positioned in the axial direction of a paraboloid as original irradiation sources, calculating directional diagram data of each single feed source by adopting a phase-only weighting method to obtain scanning beams of the antenna, adjusting parameters of the shaping reflecting surfaces and the axial positions of the line feed sources, determining the parameters of the current shaping reflecting surfaces as first parameters and determining the axial positions of the current line feed sources as the first axial positions when the sidelobe levels of the directional diagrams and the beam widths of the scanning beams meet third preset conditions; the third preset condition indicates that the beam width of the antenna can cover directions of +/-5 degrees and +/-3 degrees, and the side lobe level changes weakly along with the change of a scanning angle; the line feed source is obtained by arranging a plurality of single feed sources along the azimuth direction at the initial axial position; setting the single feed source positioned in the axial direction of the paraboloid as an original irradiation source, setting parameters of a shaping reflecting surface as preset parameters, adjusting the axial position of the single feed source, and determining the axial position of the single feed source when the beam width coverage angle of the single feed source passing through the reflecting surface meets a first preset condition; the first preset condition represents that the beam width of the single feed source passing through the reflecting surface covers +/-5 degrees;
the determining unit is used for determining a curve of the distance of the shaped reflecting surface to the tangent plane, and comprises:
performing offset feedback setting on the reflecting surface in the distance direction, and generating a curve of the distance tangent plane according to the optimal focal length parameter of the parabola; wherein the optimal focal length parameter represents a focusing parameter when the requirements of a scanning capability of a distance direction of +/-3 degrees and low sidelobe can be met.
5. A bifocal shaped reflector antenna obtained by the method of claim 1, comprising: phased array feed source, shaping reflecting surface; the phased array feed source generates a beam with scanning capability, and the beam with scanning capability passes through the shaping reflecting surface to realize large-angle scanning of the reflecting surface antenna.
6. The antenna of claim 5, wherein the phased array feed is positioned as an offset feed.
7. A computer readable storage medium, characterized in that the computer readable storage medium stores one or more programs which are executable by one or more processors to implement the steps of the method according to any one of claims 1 to 3.
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