CN108987937B - Design method and device for bifocal shaped reflector antenna - Google Patents

Abstract

The embodiment of the present invention discloses a method for a bifocal shaped reflective surface antenna, the method is used for a bifocal shaped reflective surface antenna, and the bifocal shaped reflective surface antenna includes a phased array feed source and a shaped reflective surface The method includes: presetting the shaped reflection surface as a paraboloid, determining the curve of the azimuth tangent plane and the curve of the distance tangent plane of the shaped reflection surface; combining the curve of the azimuth tangent plane and the curve of the distance tangent plane to obtain The curved surface equation of the shaped reflector, because the azimuth and distance of the reflector use different equations to construct the surface shape of the entire reflector, this reflector antenna can achieve a scanning range of ±5° in the azimuth direction and ±3° in the distance, and Ensure that the antenna has a stable gain output within the scanning range. The embodiment of the present invention also discloses a device for a bifocal shaped reflective surface antenna, a bifocal shaped reflective surface antenna and a computer-readable storage medium.

Description

Design method and device for bifocal shaped reflector antenna

technical field

The invention relates to the multi-polarization synthetic aperture radar SAR technology in the spaceborne field, in particular to a method and device for a bifocal shaped reflective surface antenna, a bifocal shaped reflective surface antenna and a computer-readable storage medium.

Background technique

Geosynchronous orbit multi-polarization Synthetic Aperture Radar (SAR, Synthetic Aperture Radar) antenna aperture area is more ^than 1000m2, so it is necessary to adopt lightweight deployable antenna technology. The reflector antenna, which is composed of a phased array feed source and a deployable mesh reflector, has the characteristics of relatively simple deployment mechanism, light weight, high efficiency, space power synthesis and beam full power continuous scanning. At present, large-diameter light-weight deployable antennas are the mainstream in the field of spaceborne radar, but it is very difficult to realize the wide-angle electrical scanning required for SAR staring imaging with a phased array feed reflector antenna.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the embodiments of the present invention provide a method and device for a bifocal shaped reflective surface antenna, a bifocal shaped reflective surface antenna, and a computer-readable storage medium, which can use an active phased array feed source, through the The bifocal shaping design of the reflector antenna is carried out to realize the wide-angle scanning capability of the reflector antenna, thereby providing strong support for its engineering application.

The technical scheme of the present invention is realized as follows:

On the one hand, an embodiment of the present invention provides a method for a bifocal shaped reflector antenna, the method is used for a bifocal shaped reflector antenna, and the bifocal shaped reflector antenna includes a phased array feed source and a shaped reflective surface; the method includes:

The preset shaped reflection surface is a paraboloid, and the curve of the azimuth tangent plane and the curve of the distance tangent plane of the shaped reflection surface are determined;

The curve of the azimuth tangent plane and the curve of the distance tangent plane are combined to obtain the curved surface equation of the shaped reflection surface.

In the above solution, the curve for determining the azimuth tangent plane of the shaped reflective surface includes:

A first parameter of the shaped reflection surface and a first axial position of the feed source are determined, and a curve of the azimuth tangent plane of the shaped reflection surface is generated according to the first parameter and the first axial position of the feed source.

In the above solution, the determining of the first parameter of the shaped reflective surface and the first axial position of the feed includes:

Set the single feed source located in the axial direction of the paraboloid as the original illumination source, set the parameters of the shaped reflecting surface as the preset parameters, and adjust the axial position of the single feed source. When the beam width coverage angle satisfies the first preset condition, determine that the axial position of the single feed source is the initial axial position;

At the initial axial position, a plurality of the single feed sources are arranged in the azimuth direction into line feed sources, and the parameters of the shaped reflecting surface and the axial position of the line feed sources are adjusted. The beamwidth coverage angle of the source satisfies the first preset condition, and when the pattern fluctuation of each single feed within the beamwidth coverage angle satisfying the first preset condition satisfies the second preset condition, the current shaping is determined The parameter of the reflection surface is the second parameter, and the axial position of the current line feed is determined as the second axial position;

The pattern data of each single feed is calculated by using only the phase weighting method to obtain the scanning beam of the antenna, and the parameters of the shaped reflector and the axial position of the line feed are adjusted. When the lobe level and the beam width of the scanning beam satisfy the third preset condition, the parameter of the current shaped reflective surface is determined as the first parameter, and the axial position of the current line feed is determined as the first axial position.

In the above scheme, the curve of the distance to the tangent plane of the shaped reflective surface is determined, including:

The reflective surface is biased in the distance direction, and the focal length parameter of the parabola is adjusted. When the scanning angle of the antenna in the distance direction satisfies the fourth preset condition, the focal length parameter of the parabola is determined as the optimal focal length parameter. The Optimal Focal Length parameter produces a distance-to-tangent curve.

In the above solution, the parameters of the shaped reflecting surface and the axial position of the line feed are adjusted, and when the side lobe level of the pattern and the beam width of the scanning beam satisfy the third preset condition, determine the current The parameter of the shaped reflecting surface is the first parameter, and the axial position of the current line feed source is determined as the first axial position, including:

Adjust the surface shape of the shaped reflection surface of the feed, the axial position of the line feed, the array spacing of the feed and the length of the feed, when the side lobe level of the pattern and the beam width of the scanning beam meet the third pre- When setting conditions, determine the surface shape of the current shaped reflective surface, the array spacing of the feed and the length of the feed as the first parameters of the shaped reflective surface, and determine the axial position of the current line feed as the first axial position.

In the above solution, after the curve of the azimuth tangent plane and the curve of the distance tangent plane are merged to obtain the curved surface equation of the shaping reflection surface, the method further includes:

Based on the curved surface equation of the shaped reflecting surface, the typical beam of the antenna surface is calculated to verify the performance of the antenna.

On the one hand, an embodiment of the present invention further provides a device for a bifocal shaped reflective surface antenna, the device includes: a determination unit and a processing unit, wherein,

The determining unit is used for presupposing the shaped reflection surface as a paraboloid, and determining the curve of the azimuth tangent plane and the curve of the distance tangent plane of the shaped reflection surface;

The processing unit is configured to combine the curve of the azimuth tangent plane and the curve of the distance tangent plane to obtain the curved surface equation of the shaped reflection surface.

In one aspect, an embodiment of the present invention further provides a bifocal shaped reflective surface antenna, including: a phased array feed source and a shaped reflective surface; wherein the phased array feed source generates a beam with scanning capability, and the After the beam with scanning capability passes through the shaped reflecting surface, the large-angle scanning of the reflecting surface antenna is realized.

In the above solution, the position where the phased array feed source is placed is an offset feed.

In one aspect, an embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to The steps of implementing a method as described in any of the above.

Embodiments of the present invention provide a method and device for a bifocal shaped reflective surface antenna, a bifocal shaped reflective surface antenna, and a computer-readable storage medium, which can make good use of an active phased array feed source, The bifocal shaping design of the surface antenna realizes the wide-angle scanning capability of the reflector antenna, thereby providing strong support for its engineering application. Compared with conventional reflector antennas, the beam width of the shaped single reflector antenna can cover ±5° in azimuth and ±3° in azimuth, so as to meet the needs of large scanning angles in antenna azimuth.

Description of drawings

1 is a schematic flowchart of a method for a bifocal shaped reflector antenna provided by an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a feed provided by an embodiment of the present invention;

3 is a top view of a bifocal reflective surface provided by an embodiment of the present invention;

4 is a side view of a bifocal reflective surface provided by an embodiment of the present invention;

FIG. 5 is antenna normal beam information provided by an embodiment of the present invention;

FIG. 6 is the beam information of the antenna azimuth direction 5° and the distance direction 0° provided by an embodiment of the present invention;

FIG. 7 is the beam information of the antenna azimuth direction of 0° and the distance direction of 3° according to an embodiment of the present invention;

FIG. 8 is the beam information of the antenna azimuth direction of 5° and the distance direction of 3° according to an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a device of a bifocal shaped reflector antenna provided by an embodiment of the present invention.

Detailed ways

The technical solutions 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 a bifocal shaped reflector antenna. As shown in FIG. 1 , the method may include:

Step 101 , preset the shaped reflection surface as a paraboloid, and determine the curve of the azimuth tangent plane and the curve of the distance tangent plane of the shaped reflection surface.

Specifically, the method provided by the embodiment of the present invention can be used for a bifocal shaped reflective surface antenna, and the bifocal shaped reflective surface antenna includes at least: a phased array feed source and a shaped reflective surface.

Exemplarily, the design of the two-dimensional planar active phased array feed can be as shown in FIG. 2 , and the feed adopts a design of square-cut corners to form an octagon, so as to achieve the required scanning beam performance. The two-dimensional electronic scanning capability of the beam can be realized under the condition of ensuring that the antenna itself does not rotate mechanically, and the flexibility is improved. At the same time, its engineering ease of realization provides a strong guarantee for the entire structural design and stability of the reflector antenna. The parameters of the active phased array feed in Figure 2 are shown in the following table, where the unit spacing is the distance between two adjacent single feeds.

Table 1 Active phased array feed parameters table

Feed size 1920mm×1920mm cell spacing 30mm×30mm Number of units (AZ×EL) 64×64 unit arrangement Rectangular grid Center frequency 5.4GHz

In a possible implementation manner, the determining the curve of the azimuthal tangent plane of the shaped reflection surface includes: determining the first parameter of the shaped reflection surface and the first axial position of the feed, according to the first parameter of the shaped reflection surface. The parameters and the first axial position of the feed generate a curve of an azimuthal tangent of the shaped reflector.

Specifically determine the first parameter of the shaped reflecting surface and the first axial position of the feed, including:

Set the single feed source located in the axial direction of the paraboloid as the original illumination source, set the parameters of the shaped reflecting surface as the preset parameters, and adjust the axial position of the single feed source. When the beam width coverage angle satisfies the first preset condition, determine that the axial position of the single feed source is the initial axial position;

At the initial axial position, a plurality of the single feed sources are arranged in the azimuth direction into line feed sources, and the parameters of the shaped reflecting surface and the axial position of the line feed sources are adjusted. The beamwidth coverage angle of the source satisfies the first preset condition, and when the pattern fluctuation of each single feed within the beamwidth coverage angle satisfying the first preset condition satisfies the second preset condition, the current shaping is determined The parameter of the reflection surface is the second parameter, and the axial position of the current line feed is determined as the second axial position;

The pattern data of each single feed is calculated by using only the phase weighting method to obtain the scanning beam of the antenna, and the parameters of the shaped reflector and the axial position of the line feed are adjusted. When the lobe level and the beam width of the scanning beam satisfy the third preset condition, the parameter of the current shaped reflective surface is determined as the first parameter, and the axial position of the current line feed is determined as the first axial position.

Here, it can be understood that the coverage angle of the beam width of the single feed after passing through the reflecting surface meets the first preset condition, and it can be understood that the beam width of the single feed passing through the reflecting surface covers ±5°, so as to meet the requirement of ±5° scanning in the azimuth direction of the antenna. . The initial axial position is the axial position of the single feed when the beam width behind the reflector covers ±5°.

Specifically adjust the parameters of the shaped reflector and the axial position of the line feed, and when the side lobe level of the pattern and the beam width of the scanning beam satisfy the third preset condition, determine the parameters of the current shaped reflector is the first parameter, determine the axial position of the current line feed source as the first axial position, including:

Adjust the surface shape of the shaped reflection surface of the feed, the axial position of the line feed, the array spacing of the feed and the length of the feed, when the side lobe level of the pattern and the beam width of the scanning beam meet the third pre- When setting conditions, determine the surface shape of the current shaped reflective surface, the array spacing of the feed and the length of the feed as the first parameters of the shaped reflective surface, and determine the axial position of the current line feed as the first axial position.

In a possible implementation manner, determining the curve from the distance to the tangent plane of the shaped reflective surface, including:

The reflective surface is biased in the distance direction, and the focal length parameter of the parabola is adjusted. When the scanning angle of the antenna in the distance direction satisfies the fourth preset condition, the focal length parameter of the parabola is determined as the optimal focal length parameter. The Optimal Focal Length parameter produces a distance-to-tangent curve.

Step 102: Combine the curve of the azimuth tangent plane and the curve of the distance tangent plane to obtain the curved surface equation of the shaped reflection surface.

Further, after the curve of the azimuth tangent plane and the curve of the distance tangent plane are merged to obtain the curved surface equation of the shaping reflection surface, the method further includes:

Based on the curved surface equation of the shaped reflecting surface, the typical beam of the antenna surface is calculated to verify the performance of the antenna.

Exemplarily, the design of the bifocal shaped reflective surface is as follows.

Based on the paraboloid, the single feed source located in the axial direction of the paraboloid is used as the original illumination source. By optimizing the axial position of the feed source, the beam width of the feed source after the reflector covers ±5°, so as to satisfy the antenna azimuth scanning ±5°. 5° requirements, determine the initial axial position of the feed, that is, adjust the axial position of the single feed. When the beam width coverage angle of the single feed after passing through the reflecting surface satisfies the first preset condition, it is determined that the first preset condition is met. When setting the condition, the axial position of the single feed source is the initial axial position.

At the axial position in the previous step, that is, the initial axial position, the feeds are arranged in the azimuth direction as line feeds. By optimizing the parameters of the forming surface and adjusting the axial position of the feeds in a small range, The beam width of each feed can cover ±5°, and the pattern fluctuation of each feed within ±5° is the lowest, so as to meet the requirements of ±5° scanning capability and low side lobe level, and determine the endowment. The parameters of the profile and the position of the feed, that is, to adjust the parameters of the profiled reflector and the axial position of the line feed, when the beam width coverage angle of each single feed satisfies the first preset condition, and when the first When the pattern fluctuation of each single feed within the beam width coverage angle of the preset condition satisfies the second preset condition, it is determined that the parameter of the currently shaped reflecting surface when the first preset condition and the second preset condition are met is the second parameter, it is determined that the axial position of the current line feed source when the first preset condition and the second preset condition are satisfied is the second axial position.

The pattern data of each feed is weighted by phase only, the scanning beam of the antenna is calculated, and the side lobes and beam width of the pattern are verified. Among them, the beam width can be determined by optimizing the array spacing and feed length of the feed, that is, the beam width can meet the third preset condition by adjusting the array spacing and feed length of the feed, and the side lobe level needs to be Adjust the surface shape and the axial position of the feed source for optimization, that is, the side lobe level can meet the third preset condition by adjusting the surface shape of the shaped reflecting surface of the feed source and the axial position of the line feed source.

In the distance direction, the reflective surface is biased and designed, and the optimal focal length parameters of the parabola are optimized to meet the requirements of ±3° scanning capability and low side lobes in the distance direction, that is, by adjusting the focal length parameters of the parabola, the distance direction of the antenna The scanning angle satisfies the fourth preset condition, and it is determined that the focal length parameter of the parabola when the fourth preset condition is met is the optimal focal length parameter.

Combine the curves of the two tangent planes to form the overall surface equation; then calculate the typical beam of the entire antenna surface to verify its performance, that is, combine the curves of the azimuth tangent plane and the distance tangent plane to obtain the shape Surface equation for a reflective surface.

The above method is used for calculation, and the antenna topology is preliminarily determined according to the overall constraints of the antenna, and all have good performance.

The surface type of the single reflecting surface is the shaping surface, and the reflecting surface equation is:

Wherein, F ₁ =10.9, F ₂ =9.5, k=0.05, a=1.2, where F ₁ and F ₂ are the focal lengths of the bifocal reflective surface, k is the stretching factor, a is the curvature factor, and the reflective surface aperture AZ× EL is: 24m×22m. The distance between the feed source and the vertex of the forming surface is 10m. The definition of the antenna structure parameters is shown in Figure 3 and Figure 4.

In the bifocal shaping design of the reflector, in order to make the two-dimensional scanning capability of the reflector antenna meet the technical requirements in engineering applications, the azimuth and distance directions of the reflector are shaped with different curves respectively, and the two-dimensional reflector is obtained. The shaping equation ensures that it obtains different beam scanning capabilities in two dimensions.

For the performance analysis of the reflector antenna obtained by the above method, the pattern of the antenna beam pointing in the normal direction is shown in Fig. 5; °, the direction diagram of the 3° distance direction is shown in Figure 7; the antenna beam pointing is 5° in the azimuth direction, and the direction diagram of the distance direction 3° is shown in Figure 8.

The directivity coefficients of the antenna under different scanning angles are shown in Table 2 below. The horizontal axis angle in Table 2 is the range direction, and the vertical axis angle is the azimuth direction. It can be seen from Table 2 that the change of the directivity coefficient is small with the change of the scanning angle.

Table 2

The change of the beam width in the azimuth direction of the antenna with the scanning angle is shown in Table 3 below. The angle of the horizontal axis in Table 3 is the range direction, and the angle of the vertical axis is the azimuth direction. It can be seen from Table 3 that the change of the antenna azimuth beamwidth is very small with the change of the scanning angle.

table 3

The variation of the beam width in the antenna range direction with the scanning angle is shown in Table 4 below. The horizontal axis angle in Table 4 is the range direction, and the vertical axis angle is the azimuth direction. It can be seen from Table 4 that the change of the antenna distance to the beam width is very small with the change of the scanning angle.

Table 4

The change of the sidelobe level in the azimuth direction of the antenna with the scanning angle is shown in Table 5 below. The horizontal axis angle in Table 5 is the range direction, and the vertical axis angle is the azimuth direction. It can be seen from Table 5 that with the change of the scanning angle, the change of the side lobe level in the azimuth direction of the antenna is very small.

table 5

The variation of the sidelobe level in the antenna range direction with the scanning angle is shown in Table 6 below. The horizontal axis angle in Table 6 is the range direction, and the vertical axis angle is the azimuth direction. It can be seen from Table 6 that with the change of the scanning angle, the change of the antenna distance to the sidelobe level is very small.

Table 6

It can be seen from the above tables that the directivity coefficient, azimuth beamwidth, range beamwidth, azimuth sidelobe level, and range sidelobe level all change very little with the change of scanning angle. To sum up, the bifocal shaped reflector antenna has good wide-angle two-dimensional scanning capability, and has engineering realizability, which can meet the design requirements.

The method for bifocal shaping a reflector antenna provided by the embodiment of the present invention can make good use of an active phased array feed source, and realize wide-angle scanning of the reflector antenna by performing a dual focus shaping design on the reflector antenna. ability to provide strong support for its engineering application. Compared with conventional reflector antennas, the beam width of the shaped single reflector antenna can cover ±5° in azimuth and ±3° in azimuth, so as to meet the needs of large scanning angles in antenna azimuth.

An embodiment of the present invention further provides an apparatus 20 for a bifocal shaped 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 shaped reflection surface as a paraboloid, and determine the curve of the azimuth tangent plane and the curve of the distance tangent plane of the shaped reflection surface;

The processing unit 202 is configured to combine the curve of the azimuth tangent plane and the curve of the range tangent plane to obtain the curved surface equation of the shaped reflection surface.

Further, the determining unit 201 is specifically configured to determine the first parameter of the shaped reflective surface and the first axial position of the feed, and generate the given parameter according to the first parameter and the first axial position of the feed. The curve of the azimuthal tangent plane of the reflective surface.

Further, the determining unit 201 is specifically used for:

Set the single feed source located in the axial direction of the paraboloid as the original illumination source, set the parameters of the shaped reflecting surface as the preset parameters, and adjust the axial position of the single feed source. When the beam width coverage angle satisfies the first preset condition, determine that the axial position of the single feed source is the initial axial position;

At the initial axial position, a plurality of the single feed sources are arranged in the azimuth direction into line feed sources, and the parameters of the shaped reflecting surface and the axial position of the line feed sources are adjusted. The beamwidth coverage angle of the source satisfies the first preset condition, and when the pattern fluctuation of each single feed within the beamwidth coverage angle satisfying the first preset condition satisfies the second preset condition, the current shaping is determined The parameter of the reflection surface is the second parameter, and the axial position of the current line feed is determined as the second axial position;

The pattern data of each single feed is calculated by using only the phase weighting method to obtain the scanning beam of the antenna, and the parameters of the shaped reflector and the axial position of the line feed are adjusted. When the lobe level and the beam width of the scanning beam satisfy the third preset condition, the parameter of the current shaped reflective surface is determined as the first parameter, and the axial position of the current line feed is determined as the first axial position.

Further, the determining unit 201 is specifically used for:

The reflective surface is biased in the distance direction, and the focal length parameter of the parabola is adjusted. When the scanning angle of the antenna in the distance direction satisfies the fourth preset condition, the focal length parameter of the parabola is determined as the optimal focal length parameter. The Optimal Focal Length parameter produces a distance-to-tangent curve.

Further, the determining unit 201 is specifically used for:

Adjust the surface shape of the shaped reflection surface of the feed, the axial position of the line feed, the array spacing of the feed and the length of the feed, when the side lobe level of the pattern and the beam width of the scanning beam meet the third pre- When setting conditions, determine the surface shape of the current shaped reflective surface, the array spacing of the feed and the length of the feed as the first parameters of the shaped reflective surface, and determine the axial position of the current line feed as the first axial position.

Further, the processing unit 202 is further configured to calculate the typical beam of the antenna surface based on the curved surface equation of the shaped reflective surface, so as to verify the performance of the antenna.

Specifically, for the understanding of the apparatus for the bifocal shaped reflective surface antenna provided by the embodiment of the present invention, reference may be made to the description of the above-mentioned method embodiment of the bifocal shaped reflective surface antenna, which is not repeated in the embodiment of the present invention.

An embodiment of the present invention further provides a bifocal shaped reflective surface antenna, including: a phased array feed source and a shaped reflective surface; wherein the phased array feed source generates a beam with scanning capability, and the After the beam passes through the shaped reflecting surface, the large-angle scanning of the reflecting surface antenna is realized.

Wherein, the position where the phased array feed source is placed is an offset feed.

Embodiments of the present invention further provide a computer-readable storage medium, where one or more programs are stored in the computer-readable storage medium, and the one or more programs can be executed by one or more processors to implement the above steps of the method described.

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 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 having computer-usable program code embodied therein, including but not limited to disk storage, optical storage, and the like.

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 process and/or block in the flowchart illustrations and/or block diagrams, and combinations of processes and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection 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.

Images