CN108987937A - A kind of method and apparatus of bifocus Shaped-beam reflector antenna - Google Patents

Abstract

The embodiment of the present invention discloses 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 reflector ; The method includes: presetting the shaped reflective surface as a paraboloid, determining the curve of the azimuth tangent surface and the curve of the distance tangent surface of the shaped reflective surface; merging the curve of the azimuth tangent surface and the curve of the distance tangent surface to obtain The 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 and ±3° in the distance, and Ensure that the antenna has a stable gain output within the scanning range. The embodiment of the invention also discloses a bifocal shaped reflector antenna device, a bifocal shaped reflector antenna and a computer-readable storage medium.

Description

Method and device for bifocal shaped reflector antenna

technical field

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

Background technique

The geosynchronous orbit multi-polarization Synthetic Aperture Radar (SAR, Synthetic Aperture Radar) has an antenna aperture area of more than 1000m ² , so it is necessary to adopt lightweight deployable antenna technology. The reflector antenna composed of a phased array feed and a deployable mesh reflector has the characteristics of relatively simple deployment mechanism, light weight, high efficiency, and the ability to realize spatial power combining and full-power continuous scanning of the beam. At present, large-aperture lightweight deployable antennas are the mainstream in the spaceborne radar field, but it is very difficult to realize the wide-angle electronic scanning required by SAR staring imaging with phased array feed reflector antennas.

Contents of the invention

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

Technical scheme of the present invention is realized like this:

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 and a shaped reflector antenna. shaped reflective surface; the method includes:

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

The curve of the azimuth tangent plane and the curve of the distance tangent plane are merged to obtain the surface equation of the shaped reflecting surface.

In the above scheme, the curve for determining the azimuthal tangent plane of the shaped reflective surface includes:

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

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

Set the single feed located in the axial direction of the parabolic surface as the original illumination source, set the parameters of the shaped reflector as preset parameters, adjust the axial position of the single feed, and when the single feed passes through the reflector When the beam width coverage angle satisfies the first preset condition, determine the axial position of the single feed as the initial axial position;

At the initial axial position, a plurality of the single feeds are arranged into a line feed along the azimuth direction, and the parameters of the shaped reflecting surface and the axial position of the line feed are adjusted. When each single feed The beamwidth coverage angle of the source satisfies the first preset condition, and when the pattern fluctuation of each single feed source within the beamwidth coverage angle that satisfies the first preset condition satisfies the second preset condition, determine the current shaping The parameter of the reflecting 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 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 meet the third preset condition, the parameter of the current shaped reflector 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, determining the distance-to-tangential curve of the shaped reflective surface includes:

In the distance direction, the reflective surface is biased, 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 to be the optimal focal length parameter. According to the optimal The optimal focal length parameter generates a curve for the distance tangent plane.

In the above solution, the parameters of the shaped reflector and the axial position of the line feed are adjusted, and when the sidelobe level of the pattern and the beam width of the scanning beam meet the third preset condition, the current The parameter of the shaped reflector is the first parameter, and the axial position of the current line feed is determined as the first axial position, including:

Adjust the surface shape of the shaped reflector 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 predetermined When setting the conditions, determine the surface shape of the current shaped reflective surface, the array spacing of the feed sources and the length of the feed source as the first parameters of the shaped reflective surface, and determine the axial position of the current linear feed source as the first axial position.

In the above solution, after merging the curve of the azimuth tangent plane and the curve of the distance tangent plane to obtain the surface equation of the shaped reflection surface, it also includes:

Based on the surface equation of the shaped reflector, 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 also provides a device for a bifocal shaped reflector antenna, the device includes: a determining unit and a processing unit, wherein,

The determining unit is configured to preset the shaped reflective surface as a paraboloid, and determine the curve of the azimuth tangent plane and the curve of the distance tangent plane of the shaped reflective 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 a surface equation of the shaped reflecting surface.

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

In the above solution, the position of the phased array feed is offset feed.

On the one hand, the embodiment of the present invention also provides a computer-readable storage medium, 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 Implement the steps of any one of the methods described above.

Embodiments of the present invention provide a method and device for a bifocal shaped reflector antenna, a bifocal shaped reflector antenna, and a computer-readable storage medium, which can make good use of an active phased array feed source, by The double-focus shape-forming design of the reflector antenna realizes the wide-angle scanning capability of the reflector antenna, thus 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 to meet the requirement of large scanning angle in azimuth of the antenna.

Description of drawings

FIG. 1 is a schematic flow diagram of a method for a bifocal shaped reflector antenna provided by 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 reflecting surface provided by an embodiment of the present invention;

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

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

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

Fig. 7 is the antenna azimuth direction 0° distance direction 3° beam information provided by the embodiment of the present invention;

Fig. 8 is the beam information of the antenna azimuth direction 5° distance direction and 3° direction provided by the embodiment of the present invention;

FIG. 9 is a schematic diagram of a device structure 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 in conjunction with the 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, presupposing that the shaped reflective surface is a paraboloid, and determining the curve of the azimuth tangent plane and the curve of the distance tangent plane of the shaped reflective surface.

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

Exemplarily, the design of the two-dimensional planar active phased array feed can be shown in FIG. 2 , and the feed adopts a square cut corner to form an octagonal design, so as to achieve the required scanning beam performance. The two-dimensional electronic scanning capability of the beam can be realized without mechanical rotation of the antenna itself, 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 table below, where the unit spacing is the distance between two adjacent single feeds.

Table 1 Active Phased Array Feed Parameters

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 reflective surface includes: determining the first parameter of the shaped reflective surface and the first axial position of the feed source, according to the first The parameters and the first axial position of the feed generate a curve for the azimuthal tangent of the shaped reflective surface.

Specifically determine the first parameter of the shaped reflector and the first axial position of the feed source, including:

Set the single feed located in the axial direction of the parabolic surface as the original illumination source, set the parameters of the shaped reflector as preset parameters, adjust the axial position of the single feed, and when the single feed passes through the reflector When the beam width coverage angle satisfies the first preset condition, determine the axial position of the single feed as the initial axial position;

At the initial axial position, a plurality of the single feeds are arranged into a line feed along the azimuth direction, and the parameters of the shaped reflecting surface and the axial position of the line feed are adjusted. When each single feed The beamwidth coverage angle of the source satisfies the first preset condition, and when the pattern fluctuation of each single feed source within the beamwidth coverage angle that satisfies the first preset condition satisfies the second preset condition, determine the current shaping The parameter of the reflecting 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 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 meet the third preset condition, the parameter of the current shaped reflector is determined as the first parameter, and the axial position of the current line feed is determined as the first axial position.

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

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

Adjust the surface shape of the shaped reflector 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 predetermined When setting the conditions, determine the surface shape of the current shaped reflective surface, the array spacing of the feed sources and the length of the feed source as the first parameters of the shaped reflective surface, and determine the axial position of the current linear feed source as the first axial position.

In a possible implementation manner, determining the distance-to-tangential curve of the shaped reflective surface includes:

In the distance direction, the reflective surface is biased, 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 to be the optimal focal length parameter. According to the optimal The optimal focal length parameter generates a curve for the distance tangent plane.

Step 102, combining the curves of the azimuth tangent plane and the distance tangent plane to obtain a surface equation of the shaped reflecting surface.

Further, after merging the curve of the azimuth tangent plane and the curve of the distance tangent plane to obtain the surface equation of the shaped reflection surface, it further includes:

Based on the surface equation of the shaped reflector, 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 parabola, the single feed located in the axial direction of the parabola is used as the original irradiation source. By optimizing the axial position of the feed, the beam width of the feed after passing the reflector covers ±5°, so as to meet the requirements of the antenna azimuth scanning ±5°. 5°, determine the initial axial position of the feed, that is, adjust the axial position of the single feed, and when the beam width coverage angle of the single feed after passing the reflector meets the first preset condition, it is determined that the first preset condition is met. When the conditions are set, the axial position of the single feed 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 to form a line feed. By optimizing the parameters of the forming surface and adjusting the axial position of the feed in a small range, Make the beam width of each feed source cover ±5°, and the pattern fluctuation of each feed source within ±5° is the lowest, so as to meet the requirements of ±5° scanning capability and low side lobe level, determine the given The parameters of the profiled surface and the position of the feed source, that is, to adjust the parameters of the shaped reflector and the axial position of the line feed source, when the beamwidth coverage angle of each single feed source satisfies the first preset condition, and when the first When the pattern fluctuation of each single feed source within the beam width coverage angle of the preset condition satisfies the second preset condition, it is determined that the parameter of the current shaping reflector is the second when the first preset condition and the second preset condition are met. parameter, and determine that the axial position of the front line feed source is the second axial position when the first preset condition and the second preset condition are met.

The pattern data of each feed is weighted only by phase to calculate the scanning beam of the antenna, and verify the sidelobe and beam width of the pattern. Among them, the beam width can be determined by optimizing the feed array spacing and feed length, that is, the beam width can meet the third preset condition by adjusting the feed array spacing and feed length, and the sidelobe level needs to be Adjust the surface shape and the axial position of the feed source to optimize, that is, the side lobe level can meet the third preset condition by adjusting the surface shape of the shaped reflection surface of the feed source and the axial position of the line feed source.

In the distance direction, the reflective surface is biased to design, and the best focal length parameter of the parabola is optimized to meet the scanning ability of ±3° in the distance direction and the requirements of low sidelobes, that is, by adjusting the focal length parameter of the parabola, the distance direction of the antenna is adjusted. The scanning angle satisfies the fourth preset condition, and it is determined that the focal length parameter of the parabola is the optimal focal length parameter when the fourth preset condition is met.

Merge the curves of the two tangent planes to form the total surface equation; then calculate the typical beam of the entire antenna surface to verify its performance, that is, merge the curve of the azimuth tangent plane and the curve of the distance tangent plane to obtain the shaped The surface equation of the reflective surface.

Using the above method to calculate, according to the overall constraint conditions of the antenna, the topological configuration of the antenna is preliminarily determined, all of which have good performance.

The surface type of a single reflector is a shaped surface, and the reflector equation is:

Among them, F ₁ =10.9, F ₂ =9.5, k=0.05, a=1.2, wherein, F ₁ and F ₂ are the focal length of the bifocal reflective surface, k is the expansion factor, a is the curvature factor, and the reflective surface diameter is AZ× EL is: 24m×22m. The distance between the feed source and the apex of the forming surface is 10m. The definition of antenna structure parameters is shown in Figure 3 and Figure 4.

The bifocal shape-forming design of the reflecting surface, in order to make the two-dimensional scanning ability of the reflecting surface antenna meet the technical index requirements in engineering applications, the azimuth and distance directions of the reflecting surface are respectively shaped by different curves, and the two-dimensional scanning ability of the reflecting surface is obtained. The shaping equation ensures that it can obtain different beam scanning capabilities in two dimensions.

For the performance analysis of the reflector antenna obtained by the above method, the direction diagram of the antenna beam pointing to the normal direction is shown in Figure 5; the antenna beam is pointing to the azimuth direction of 5°, and the direction diagram of the distance direction of 0° is shown in Figure 6; the antenna beam is pointing to the azimuth direction of 0° °, the 3° range direction diagram is shown in Figure 7; the antenna beam points to the azimuth 5° direction, and the range direction 3° direction diagram is shown in Figure 8.

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

Table 2

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

table 3

The variation of the beam width in the range direction of the antenna with the scanning angle is shown in Table 4 below. The angle on the horizontal axis in Table 4 is the range direction, and the angle on the vertical axis 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 variation of sidelobe levels 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 distance direction, and the vertical axis angle is the azimuth direction. It can be seen from Table 5 that the change of the antenna azimuth to the sidelobe level is very small with the change of the scanning angle.

table 5

The sidelobe level in the range direction of the antenna varies with the scanning angle as 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 the change of the antenna distance to the sidelobe level is very small with the change of the scanning angle.

Table 6

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

The method for the dual-focus shaped reflector antenna provided by the embodiment of the present invention can make good use of the active phased array feed, and realize the wide-angle scanning of the reflector antenna through the dual-focus shaped design of the reflector antenna ability, so as 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 to meet the requirement of large scanning angle in azimuth of the antenna.

The embodiment of the present invention also provides a device 20 for a bifocal shaped reflector antenna. As shown in FIG. 9 , the device includes: a determining unit 201 and a processing unit 202, wherein,

The determination unit 201 is used to preset the shaped reflective surface as a paraboloid, and determine the curve of the azimuth tangent plane and the curve of the distance tangent plane of the shaped reflective 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 surface equation of the shaped reflecting surface.

Further, the determining unit 201 is specifically configured to determine the first parameter of the shaped reflection surface and the first axial position of the feed source, and generate the assigned value according to the first parameter and the first axial position of the feed source. The azimuth-to-tangent curve of the type reflector.

Further, the determining unit 201 is specifically configured to:

Set the single feed located in the axial direction of the parabolic surface as the original illumination source, set the parameters of the shaped reflector as preset parameters, adjust the axial position of the single feed, and when the single feed passes through the reflector When the beam width coverage angle satisfies the first preset condition, determine the axial position of the single feed as the initial axial position;

At the initial axial position, a plurality of the single feeds are arranged into a line feed along the azimuth direction, and the parameters of the shaped reflecting surface and the axial position of the line feed are adjusted. When each single feed The beamwidth coverage angle of the source satisfies the first preset condition, and when the pattern fluctuation of each single feed source within the beamwidth coverage angle that satisfies the first preset condition satisfies the second preset condition, determine the current shaping The parameter of the reflecting 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 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 meet the third preset condition, the parameter of the current shaped reflector 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 configured to:

In the distance direction, the reflective surface is biased, 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 to be the optimal focal length parameter. According to the optimal The optimal focal length parameter generates a curve for the distance tangent plane.

Further, the determining unit 201 is specifically configured to:

Adjust the surface shape of the shaped reflector 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 predetermined When setting the conditions, determine the surface shape of the current shaped reflective surface, the array spacing of the feed sources and the length of the feed source as the first parameters of the shaped reflective surface, and determine the axial position of the current linear feed source as the first axial position.

Further, the processing unit 202 is further configured to calculate a typical beam of the antenna surface based on the surface equation of the shaped reflection surface, and verify the performance of the antenna.

Specifically, for an understanding of the device for the bifocal shaped reflector antenna provided in the embodiment of the present invention, reference may be made to the description of the above method embodiment for the bifocal shaped reflector antenna, and details will not be repeated here in the embodiment of the present invention.

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

Wherein, the position where the phased array feed is placed is bias feed.

An embodiment of the present invention also provides a computer-readable storage medium, 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 achieve the above steps of the method described above.

Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, systems, or computer program products. Accordingly, the present invention can 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 and optical storage, etc.) 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 should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the 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 operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart 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 (10)

1. A method for a bifocal shaped reflector antenna, characterized in that, the method is used for a bifocal shaped reflector antenna, and the bifocal shaped reflector antenna includes a phased array feed and a shaped reflector face; the method includes: The default shaped reflective surface is a paraboloid, and the curve of the azimuth tangent plane and the curve of the distance tangent plane of the shaped reflective surface are determined; The curve of the azimuth tangent plane and the curve of the distance tangent plane are merged to obtain the surface equation of the shaped reflecting surface. 2. The method according to claim 1, wherein said determining the curve of the azimuthal tangent plane of said shaped reflective surface comprises: A first parameter of the shaped reflective surface and a first axial position of the feed source are determined, and a curve of an azimuthal tangent plane of the shaped reflective surface is generated according to the first parameter and the first axial position of the feed source. 3. The method according to claim 2, wherein said determining the first parameter of the shaped reflecting surface and the first axial position of the feed source comprises: Set the single feed located in the axial direction of the parabolic surface as the original illumination source, set the parameters of the shaped reflector as preset parameters, adjust the axial position of the single feed, and when the single feed passes through the reflector When the beam width coverage angle satisfies the first preset condition, determine the axial position of the single feed as the initial axial position; At the initial axial position, a plurality of the single feeds are arranged into a line feed along the azimuth direction, and the parameters of the shaped reflecting surface and the axial position of the line feed are adjusted. When each single feed The beamwidth coverage angle of the source satisfies the first preset condition, and when the pattern fluctuation of each single feed source within the beamwidth coverage angle that satisfies the first preset condition satisfies the second preset condition, determine the current shaping The parameter of the reflecting 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 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 meet the third preset condition, the parameter of the current shaped reflector is determined as the first parameter, and the axial position of the current line feed is determined as the first axial position. 4. The method according to any one of claims 1 to 3, wherein determining the distance-to-tangent curve of the shaped reflective surface comprises: In the distance direction, the reflective surface is biased, 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 to be the optimal focal length parameter. According to the optimal The optimal focal length parameter generates a curve for the distance tangent plane. 5. The method according to claim 3, characterized in that, when adjusting the parameters of the shaped reflector and the axial position of the line feed, when the sidelobe level of the pattern and the beam width of the scanning beam When the third preset condition is met, determine the parameter of the current shaping reflective surface as the first parameter, and determine the axial position of the current line feed as the first axial position, including: Adjust the surface shape of the shaped reflector 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 predetermined When setting the conditions, determine the surface shape of the current shaped reflective surface, the array spacing of the feed sources and the length of the feed source as the first parameters of the shaped reflective surface, and determine the axial position of the current linear feed source as the first axial position. 6. The method according to claim 1, characterized in that, after the curve of the azimuth tangent plane and the curve of the distance tangent plane are merged to obtain the surface equation of the shaped reflecting surface, further comprising : Based on the surface equation of the shaped reflector, the typical beam of the antenna surface is calculated to verify the performance of the antenna. 7. A device for a bifocal shaped reflector antenna, characterized in that the device comprises: a determination unit and a processing unit, wherein, The determination unit is used to preset the shaped reflective surface as a paraboloid, and determine the curve of the azimuth tangent plane and the curve of the distance tangent plane of the shaped reflective 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 a surface equation of the shaped reflective surface. 8. A bifocal shaped reflector antenna, characterized in that it comprises: a phased array feed and a shaped reflector; wherein, the phased array feed produces a beam with scanning capability, and the After the beam passes through the shaped reflective surface, large-angle scanning of the reflective surface antenna is realized. 9. The antenna according to claim 8, characterized in that, the phased array feed is placed in an offset feed. 10. A computer-readable storage medium, characterized in that, 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 realize the The steps of the method described in any one of claims 1 to 6.