A ring truss type radial rib cable net antenna and a form-finding design method thereof

Abstract

The application discloses a kind of annular truss type radial rib cable net antennas and its form-finding design method, including radial rib, cable net and peripheral truss;Peripheral truss is annular structure, cable net is located in the inside of peripheral truss, and radial rib is connected at the top of cable net;Cable net includes multiple annular auxiliary panels, multiple radial panels and a central body cable segment, multiple annular auxiliary panels are different in diameter, and are arranged in multiple circles according to the diameter from small to large, central body cable segment is located at the center, annular auxiliary panel gradually reduces in height from outside to inside, and the height of central body cable segment is lower than the height of the innermost annular auxiliary panel;Multiple radial panels are arranged in a ring, the front end of each radial panel is connected with the central body cable segment, the tail end is connected with the peripheral truss, and the middle is connected with each annular auxiliary panel.

Description

Technical Field

[0001] This invention belongs to the field of spaceborne antennas and relates to a ring truss radial rib cable net antenna and its shape-finding design method. Background Technology

[0002] In the context of the continuous development of satellite communication technology, spaceborne antennas, as the "eyes" and "ears" of satellite systems, play a crucial role. With the increasing demand for information transmission, spaceborne antennas are evolving towards higher precision (higher frequency bands), larger apertures (higher gain), and lighter weight. To achieve high gain, the most direct approach is to increase the aperture and increase the operating frequency. Similarly, higher operating frequencies place more stringent requirements on surface accuracy.

[0003] Cable-net reflector antennas, with their lightweight, large-aperture, foldable, and efficient structural design, have become important tools in space communication and detection. Large spaceborne cable-net reflector antennas mainly include ring truss, radial rib, and frame types. Ring truss antennas have a large deployment-to-retraction ratio and a simple mechanism, but they suffer from large folding height and difficulty in adjusting surface accuracy when used in large-aperture antennas. Radial rib antennas can be folded into a smaller volume during transmission and unfolded into a larger size in space after transmission with high surface accuracy. However, implementing a large-aperture design significantly increases the structural weight and the complexity of the deployment mechanism. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a ring truss radial rib cable net antenna and its shape-finding design method, which has the advantages of a large spread-out ratio and high stiffness of a ring truss antenna, while also having the advantages of high precision of a rib antenna.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] A ring-shaped truss-type radial rib cable net antenna includes radial ribs, a cable net, and a peripheral truss;

[0007] The perimeter truss is a ring structure, the cable net is located inside the perimeter truss, and the radial ribs are connected to the top of the cable net.

[0008] The cable net consists of multiple circumferential auxiliary panels, multiple radial panels, and a central cable segment. The multiple circumferential auxiliary panels have different diameters and are arranged in multiple concentric circles according to their diameters, from smallest to largest. The central cable segment is located at the center of the circle. The height of the circumferential auxiliary panels gradually decreases from the outside to the inside, and the height of the central cable segment is lower than that of the innermost circumferential auxiliary panel. The multiple radial panels are arranged in a ring, with each radial panel connected to the central cable segment at its front end and to the surrounding truss at its end, and connected to each circumferential auxiliary panel in the middle.

[0009] Preferably, there are multiple radial ribs arranged in a ring. Each radial rib is connected to the central body cable segment at its front end, to the peripheral truss at its end, and to each circumferential auxiliary surface piece in the middle.

[0010] Preferably, the circumferential auxiliary surface includes a top circumferential upward chord segment, a middle circumferential vertical cable, and a bottom circumferential downward chord segment; both the top and bottom circumferential upward chord segments are annular, with the same length and diameter, and there are multiple circumferential vertical cables that vertically connect the top and bottom circumferential upward chord segments.

[0011] Preferably, the central body cable segment includes a top central body upper chord cable segment, a middle central body vertical cable segment, and a bottom central body lower chord cable segment; both the central body upper chord cable segment and the central body lower chord cable segment are annular, with the same length and diameter, and there are multiple central body vertical cables that vertically connect the central body upper chord cable segment and the central body lower chord cable segment.

[0012] Preferably, the radial panel includes a top main rib cable segment, a middle main rib vertical cable, and a bottom main cable segment. The main rib cable segment connects the top of the central body cable segment, the top of each circumferential auxiliary panel, the top of the peripheral truss, and the radial rib. The main cable segment connects the bottom of the central body cable segment, the bottom of each circumferential auxiliary panel, and the bottom of the peripheral truss. There are multiple main rib vertical cables that vertically connect the main rib cable segments and the main cable segments.

[0013] A form-finding design method for a ring-shaped truss-type radial ribbed cable net antenna includes the following process:

[0014] S1, Determine the basic parameters of the annular radial rib type deployable cable net antenna;

[0015] S2, the finite element model of the cable net is obtained based on the basic parameters;

[0016] S3. Apply the horizontal tension given in the step to each circumferential auxiliary surface in the finite element model so that each circumferential auxiliary surface remains taut. The horizontal tension gradually decreases from the inside to the outside. The horizontal tension of each cable segment in the same circumferential auxiliary surface is the same. Calculate the internal tension of each horizontal cable segment according to the angle between each horizontal cable segment and the horizontal direction. Calculate the vertical component according to the angle between each horizontal cable segment and the vertical direction. Then solve the tension of the vertical cable by calculating the vertical component of each node.

[0017] S4. Based on the tension of the circumferential auxiliary surface plate, the tension of each cable segment of the radial surface plate is calculated through the force balance equation of each node.

[0018] S5. Based on the obtained tension of the radial surface, write the force balance equation for the nodes of the central body cable segment and solve for the cable segment tension of the central body cable segment.

[0019] Preferably, the basic parameters include antenna aperture, focal length, number of peripheral trusses, diameter and height of the central body, radial rib arrangement, and horizontal tension of the circumferential auxiliary surface.

[0020] Preferably, the specific process of S3 is as follows: Calculate the tension of each cable segment in the upward chord segment and the downward chord segment:

[0021]

[0022] T ij F represents the tension in the cable segment between nodes i and j. H Given the horizontal tension of the circumferential auxiliary surface patch; ijH Let be the projected length of the cable between the two nodes in the horizontal plane, i.e.:

[0023]

[0024] l ij The length of the cable between the two nodes is:

[0025]

[0026] Among them, {x i y i , z i},{x j y j , z j} represent the coordinates of nodes i and j, respectively;

[0027] Calculate the tension of the circumferential vertical cable in the circumferential auxiliary surface:

[0028]

[0029] F iv denoted as , where is the tension of the circumferential vertical cable at node i; j represents the node number connected to node i; and e represents the total number of nodes connected to node i.

[0030] Preferably, the specific process of S4 is as follows: the tension of the main rib vertical cable and the main cable segment is obtained from the main rib cable segment, and the main rib cable segment is projected onto the OXY plane; the force balance equation in the X direction is listed for each internal node:

[0031]

[0032] T ij For the tension of the cable segment between nodes i and j, l ij x is the cable length between the two nodes. i x j Here are the coordinates of nodes i and j; j represents the node number connected to node i; e represents the total number of nodes connected to node i.

[0033] Given the tension of the cable segment connecting the main rib cable segment and the central body cable segment, the tension of each cable segment of the main rib cable segment is obtained, and then the vertical cable tension of the main rib is obtained.

[0034] Preferably, the specific process of S5 is as follows: Write the force balance equations in the X and Y directions:

[0035]

[0036] T ij For the tension of the cable segment between nodes i and j, l ij x is the cable length between the two nodes. i y i and x j y j Here are the coordinates of nodes i and j; j represents the node number connected to node i; e represents the total number of nodes connected to node i.

[0037] By substituting the tension of the radial facet into the equation, the tension of the upper chord segment of the central body can be solved, and thus the tension of the vertical cable of the central body can be obtained.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] This invention integrates the advantages of both ring truss antennas and rib antennas, allowing the antenna to possess the high deployment-to-reception ratio and high rigidity of a ring truss antenna, while also having the high precision of a rib antenna. This design not only maintains a stable shape when deployed in space, but also ensures that the antenna maintains an ideal parabolic shape during operation under high precision requirements, thereby meeting stringent electrical performance requirements.

[0040] Furthermore, to ensure that the antenna maintains a specific parabolic shape during operation, the shape-finding method of this invention designs the shape of different parts of the cable net separately, and integrates these parts through precise connection relationships to ultimately obtain a set of pretension distributions that meet the surface accuracy requirements. This design process not only considers the overall tension balance of the cable net, but also improves the overall accuracy of the reflector surface through local optimization. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the annular truss-type radial ribbed cable net antenna structure of the present invention;

[0042] Figure 2 This is a schematic diagram of the cable net layout of the present invention;

[0043] Figure 3 This is a partial structural schematic diagram of the circumferential auxiliary surface patch of the present invention;

[0044] Figure 4 This is a schematic diagram of the radial surface patch of the present invention;

[0045] Figure 5 This is a schematic diagram of the horizontal projection of the radial surface patch of the present invention;

[0046] Figure 6 This is a schematic diagram of the connection relationship of the central body cable segments of the present invention;

[0047] Figure 7 This is a diagram showing the overall finite element simulation results of the cable-rib structure of the present invention.

[0048] Explanation of reference numerals in the attached drawings: 1-Radial rib; 2-Cable net; 3-Peripheral truss; 21-Circumferential auxiliary surface; 22-Radial surface; 23-Central body cable segment; 211-Circumferential upper chord cable segment; 212-Circumferential vertical cable; 213-Circumferential lower chord cable segment; 221-Main rib cable segment; 222-Main rib vertical cable; 223-Main cable segment; 231-Central body upper chord cable segment; 232-Central body vertical cable; 233-Central body lower chord cable segment. Detailed Implementation

[0049] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0050] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terms “installation,” “connection,” and “linkage” should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; a mechanical connection, an electrical connection, or a connection that allows communication; a direct connection or an indirect connection via an intermediate medium; or a connection within two elements or an interaction between two elements. The term “and / or” as used herein includes any and all combinations of one or more of the associated listed items. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0052] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0053] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0054] Example 1:

[0055] like Figure 1 The image shows the specific structural form of the annular truss-type radial rib cable net antenna of the present invention, which is composed of radial ribs 1, cable net 2, and peripheral truss 3.

[0056] The peripheral truss 3 is a ring structure, the cable net 2 is located inside the peripheral truss 3, and the radial rib 1 is connected to the top of the cable net 2.

[0057] The specific composition of the cable net 2 is as follows: Figure 2 As shown, it consists of multiple circumferential auxiliary surface patches 21, multiple radial surface patches 22, and a central body cable segment 23.

[0058] Multiple circumferential auxiliary surface pieces 21 have different diameters and are arranged in multiple rings around the center circle according to the diameter from small to large. The central body cable segment 23 is located at the center of the circle. The height of the circumferential auxiliary surface pieces 21 gradually decreases from the outside to the inside. The height of the central body cable segment 23 is lower than the height of the innermost circumferential auxiliary surface piece 21.

[0059] Multiple radial facets 22 are arranged in a ring. The front end of each radial facet 22 is connected to the central body cable segment 23, the end is connected to the peripheral truss 3, and the middle is connected to each circumferential auxiliary facet 21.

[0060] The radial ribs 1 are connected in the same way as the radial facets 22. Multiple radial ribs 1 are arranged in a ring. The front end of each radial rib 1 is connected to the central body cable segment 23, the end is connected to the peripheral truss 3, and the middle is connected to each circumferential auxiliary facet 21.

[0061] like Figure 3 As shown, the circumferential auxiliary surface 21 includes a top circumferential upward chord segment 211, a middle circumferential vertical cable 212, and a bottom circumferential downward chord segment 213; both the top circumferential upward chord segment 211 and the bottom circumferential downward chord segment 213 are annular, with the same length and diameter, and there are multiple circumferential vertical cables 212, which vertically connect the top circumferential upward chord segment 211 and the bottom circumferential downward chord segment 213.

[0062] The central body cable segment 23 is a ring structure, as shown below. Figure 6 As shown, the central body cable segment 23 includes a top central body upper chord cable segment 231, a middle central body vertical cable segment 232, and a bottom central body lower chord cable segment 233. Both the top and bottom chord cable segments 231 and 233 are annular, with the same length and diameter. There are multiple central body vertical cables 23, which vertically connect the top and bottom chord cable segments 231 and 233.

[0063] like Figure 4 and Figure 5 As shown, the radial patch 22 includes a top main rib cable segment 221, a middle main rib vertical cable 222, and a bottom main cable segment 223. Figure 5 The radial surface 22 is projected horizontally onto the OXY plane; the main rib cable segment 221 connects the central body upper chord cable segment 231 of the central body cable segment 23, the circumferential upper chord cable segment 211 of each circumferential auxiliary surface 21, the top of the peripheral truss 3 and the radial rib 1; the main cable segment 223 connects the central body lower chord cable segment 233 of the central body cable segment 23, the circumferential lower chord cable segment 213 of each circumferential auxiliary surface 21 and the bottom of the peripheral truss 3; there are multiple main rib vertical cables 222, which vertically connect the main rib cable segment 221 and the main cable segment 223.

[0064] In this embodiment, both the radial rib 1 and the peripheral truss 3 are deployable structures.

[0065] This invention performs shape-finding design on different components of the cable net to find a set of tensions that achieves the antenna balance and optimal surface accuracy, including the following steps:

[0066] Step 1: Determine the basic parameters of the annular radial rib type deployable cable net antenna. This includes the antenna aperture (diameter of the peripheral truss 3), focal length, number of peripheral trusses 3, diameter and height of the central body, arrangement of the radial ribs 1, and horizontal tension of the annular auxiliary surface 21.

[0067] Step 2: Generate the layout form of cable net 2 using the basic parameters determined in Step 1, and use it as the initial form for the shape-finding design.

[0068] like Figure 2 As shown, the connection relationship between the cable segments of the circumferential auxiliary surface 21 is first generated, then the connection relationship between the main rib cable segment 221 and the main cable segment 223 is generated, and finally the connection relationship between the central body cable segment 23 and the circumferential auxiliary surface 21 is formed, thus obtaining the finite element model of the cable net 2.

[0069] Step 3: Apply the horizontal tension given in Step 1 to each circumferential auxiliary surface 21, ensuring that each circumferential auxiliary surface 21 remains taut. The horizontal tension gradually decreases from the inside out. The horizontal tension is the same for all cable segments within the same circumferential auxiliary surface 21, applied to the upward chord cable segment 211 and the downward chord cable segment 213. Then, calculate the internal tension of each horizontal cable segment based on the angles between the upward and downward chord cable segments 211 and 213 and the horizontal direction. Calculate the vertical component based on the angles with the vertical direction, and then solve for the tension of the circumferential vertical cable 212 using the vertical components of each node. Since the upper and lower chords are symmetrically designed, the tension of the upward chord cable segment 211 and the downward chord cable segment 213 are the same. Specifically:

[0070] Step 301: Given the horizontal components of the upward chord segment 211 and the downward chord segment 213 in the circumferential auxiliary surface 21, since there is no external load on the upward chord segment 211 and the downward chord segment 213 in the horizontal direction, and the circumferential vertical cable 212 only provides the load in the vertical direction, the tension of the cable segments 211 and 213 is entirely determined by their angle with the horizontal direction. The tension of each cable segment in the upward chord segment 211 and the downward chord segment 213 can be calculated according to equation (1).

[0071]

[0072] In equation (1), T ij Let be the tension in the cable segment between nodes i and j;

[0073] F H Given the horizontal tension of the circumferential auxiliary surface 21;

[0074] l ijH This is the projected length of the cable length between the two nodes onto the horizontal plane (OXY plane), i.e.:

[0075]

[0076] l ij The length of the cable between the two nodes is:

[0077]

[0078] Among them, {x i y i , z i},{x j y j , z j} represent the coordinates of nodes i and j, respectively.

[0079] Step 302: Calculate the tension of the circumferential vertical cable 212 of the circumferential auxiliary surface 21. The tension of the circumferential vertical cable 212 is the sum of the vertical components of the tension of the circumferential upward chord cable segment 211 (or circumferential downward chord cable segment 213) connected to it. Since the circumferential upward chord cable segment 211 and the circumferential downward chord cable segment 213 are completely symmetrical, the tension component of the circumferential upward chord cable segment 211 can naturally be balanced with the tension component of the circumferential downward chord cable segment 213. The tension of each circumferential vertical cable 212 can be calculated according to equation (2).

[0080]

[0081] In equation (2), F iv The tension of the circumferential vertical cable 212 at node i;

[0082] j represents the node number connected to node i;

[0083] e represents the total number of nodes connected to node i.

[0084] Step 303: Based on the calculation methods given in steps 301 and 302, calculate the tension corresponding to each circumferential auxiliary surface 21 from the inside out.

[0085] Step 4: Based on the tension of the circumferential auxiliary surface 21 obtained in Step 3, perform tension form-finding design on each cable segment of the radial surface 22 through the force balance equation of each node.

[0086] like Figure 4 The diagram illustrates the positional relationship between the radial surface 22 of the main rib cable segment 221 and the main cable segment 223, and the circumferential cable segments connected to it. Specifically:

[0087] Step 401: Since the upward chord segment 211 and the downward chord segment 213 are symmetrically designed, only the tension of the main rib segment 221 needs to be solved. The tensions of the main rib vertical cable 222 and the main cable segment 223 can be obtained from the main rib segment 221. Project the main rib segment 221 onto the OXY plane, as shown... Figure 5 As shown.

[0088] Step 402: As the design shows, the cable segment is symmetrical about the X-axis, so the force balance equations in the X-direction need to be listed, that is, the force balance equations in the X-direction need to be listed for each internal node. The force balance equations for each internal node are listed according to equation (3):

[0089]

[0090] Step 403: As Figure 5 As shown, if the number of internal nodes is n, then a total of n equations can be listed. These include 3n+1 cable segments, of which 2n are circumferential cable segments connected to the internal nodes, obtained from step 3 and are known quantities. Therefore, the tension of n+1 cable segments is unknown, which is greater than the number of equations. Therefore, a cable segment tension needs to be given. Here, the tension T of the cable segment connecting the main rib cable segment 221 and the central body cable segment 23 is given. 12 .

[0091] Step 404: Solve the equation to obtain the tension of each cable segment of the main rib cable segment 221. Then solve the tension of the main rib vertical cable 222 using equation (2). Due to the symmetrical design, the tension of the main cable segment 223 is consistent with that of the main rib cable segment 221.

[0092] Step 5: Based on the tension of the radial surface 22 obtained in Step 4, write the force balance equation for the nodes of the central body cable segment 23, and solve for the cable segment tension of the central body upper chord cable segment 231 that connects each main rib cable segment 221 at the central body cable segment 23.

[0093] Step 501: As Figure 6 As shown, the force balance equation is written at node 23 of the central body cable segment according to equation (4). Since the upper and lower parts are symmetrical, only the force balance equations in the X and Y directions need to be written.

[0094]

[0095] Step 502: Substitute the tension obtained in step 4 into the equation to solve for the tension of the upper chord segment 231 of the central body.

[0096] Step 503: Then solve the tension of the vertical cable 232 of each central body using equation (2). Due to the symmetrical design, the tension of the lower chord segment 233 of the central body is consistent with that of the upper chord segment 231 of the central body.

[0097] Step 6: Input the tension of each cable segment into the corresponding finite element model and then perform relevant static analysis. Finally, it is necessary to observe the nodal displacements of each node to confirm whether they meet the relevant requirements for surface accuracy. If not, the finite element model needs to be adjusted further.

[0098] Example 2:

[0099] This embodiment provides a method such as Figure 1 The example shown is a form-finding calculation for a 2m annular truss-type high-precision radial rib-type deployable cable net antenna.

[0100] 1. Basic parameters: Antenna aperture 2m, focal length 1.3m, number of peripheral trusses 18, central body diameter 100mm, central body height 50mm, main rib first section with 2 auxiliary ribs, main rib second section with 5 auxiliary ribs, divided into six rings from the inside out, given horizontal tension of each ring {25,15,10,10,10,10}N.

[0101] 2. Example Results

[0102] Table 1. Shape-finding results

[0103]

[0104] The finite element model of the antenna's shape-finding results is as follows: Figure 7 As shown in Table 1, the shape-finding method provided by this invention can find a set of balancing forces that allow the antenna to reach a balanced state while ensuring that the maximum nodal displacement of the antenna is small.

[0105] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0106] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and applications beyond the provided examples will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this patent should not be determined by reference to the above description, but rather by reference to the foregoing claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the applicant has not considered that subject matter as part of the disclosed inventive subject matter.

Claims

1. A toroidal truss radially ribbed mesh antenna characterized by, The radial rib (1), the cable net (2) and the peripheral truss (3); The peripheral truss (3) is in a ring shape, the cable net (2) is located inside the peripheral truss (3), and the radial rib (1) is connected to the top of the cable net (2); The cable net (2) comprises a plurality of annular auxiliary panels (21), a plurality of radial panels (22) and a central body cable segment (23), the plurality of annular auxiliary panels (21) are arranged in a plurality of circles according to diameters from small to large, the central body cable segment (23) is located at the center, the height of the annular auxiliary panel (21) gradually decreases from outside to inside, and the height of the central body cable segment (23) is lower than that of the innermost annular auxiliary panel (21); the plurality of radial panels (22) are arranged in a ring shape, the front end of each radial panel (22) is connected to the central body cable segment (23), the tail end is connected to the peripheral truss (3), and the middle part is connected to each annular auxiliary panel (21).

2. A toroidal truss radially ribbed mesh antenna according to claim 1, characterised in that, The plurality of radial ribs (1) are arranged in a ring shape, the front end of each radial rib (1) is connected to the central body cable segment (23), the tail end is connected to the peripheral truss (3), and the middle part is connected to each annular auxiliary panel (21).

3. The ring truss radial ribbed mesh antenna according to claim 1, wherein, The annular auxiliary panel (21) comprises an annular top chord cable segment (211), a plurality of annular vertical cables (212) and a bottom chord cable segment (213); the annular top chord cable segment (211) and the bottom chord cable segment (213) are in a ring shape, have the same length and diameter, and are vertically connected by the plurality of annular vertical cables (212).

4. The ring truss radial ribbed mesh antenna according to claim 1, wherein, The central body cable segment (23) comprises a central body top chord cable segment (231), a plurality of central body vertical cables (232) and a central body bottom chord cable segment (233); the central body top chord cable segment (231) and the central body bottom chord cable segment (233) are in a ring shape, have the same length and diameter, and are vertically connected by the plurality of central body vertical cables (232).

5. The ring truss radial ribbed mesh antenna according to claim 1, wherein, The radial panel (22) comprises a main rib cable segment (221), a plurality of main rib vertical cables (222) and a main cable segment (223), the main rib cable segment (221) is connected to the top of the central body cable segment (23), the top of each annular auxiliary panel (21), the top of the peripheral truss (3) and the radial rib (1), the main cable segment (223) is connected to the bottom of the central body cable segment (23), the bottom of each annular auxiliary panel (21) and the bottom of the peripheral truss (3), and the plurality of main rib vertical cables (222) vertically connect the main rib cable segment (221) and the main cable segment (223).

6. A form finding design method for a toroidal truss type radial ribbed cable net antenna according to any one of claims 1 to 5, characterized in that, The method comprises the following steps: S1, determining basic parameters of the annular radial rib type deployable cable net antenna; the basic parameters comprise an antenna aperture, a focal length, a number of peripheral trusses (3), a central body diameter and height, a radial rib (1) arrangement form and annular auxiliary panel (21) horizontal tension; S2, obtaining a finite element model of the cable net (2) according to the basic parameters; S3, exerting the horizontal tension given in S1 to each annular auxiliary surface sheet (21) in the finite element model, so that each annular auxiliary surface sheet (21) is always kept in a tension state, and the horizontal tension gradually decreases from inside to outside, wherein the horizontal tension of each cable segment of the same annular auxiliary surface sheet (21) is the same, the internal tension of each horizontal cable segment is calculated according to the included angle between each horizontal cable segment and the horizontal direction, the vertical component is calculated according to the included angle with the vertical direction, and the tension of the vertical cable is solved according to the vertical component of each node; S4, calculating the tension of each cable segment of the radial surface sheet (22) according to the tension of the annular auxiliary surface sheet (21) through the force balance equation of each node; S5, solving the cable segment tension of the central body cable segment (23) according to the obtained tension of the radial surface sheet (22) through the force balance equation of the node column of the central body cable segment (23).

7. The form-finding design method for the annular truss-type radial ribbed cable net antenna according to claim 6, characterized in that, The specific process of S3 is: calculating the tension of each cable segment of the annular upper chord cable segment (211) and the annular lower chord cable segment (213): the tension of the cable segment between nodes i and j; the horizontal tension of a given circumferential auxiliary facet (21); the projection of the cable length between two nodes in the horizontal plane, i.e.: The length of the cable between the two nodes, i.e.: wherein, ], ] are the coordinates of nodes i, j, respectively; Calculating the tension of the annular vertical cable (212) of the annular auxiliary surface sheet (21): Tij is the tension of the ring vertical cable (212) at node i; j represents the node number connected to node i; e represents the total number of nodes connected to node i.

8. The form-finding design method for the annular truss-type radial ribbed cable net antenna according to claim 6, characterized in that, The specific process of S4 is: the tension of the main rib vertical cable (222) and the main cable segment (223) is obtained by the main rib cable segment (221), the main rib cable segment (221) is projected on the OXY plane; listing the force balance equation in the X direction for each internal node: Tij is the tension in the cable segment between nodes i and j, Lij is the length of the cable between nodes i and j, Xi and Xj are the coordinates of nodes i and j; j denotes the node number connected to node i; e represents the total number of nodes connected to node i; The tension of the main rib cable segment (221) connected with the central body cable segment (23) is given; the tension of each cable segment of the main rib cable segment (221) is obtained, and then the tension of the main rib vertical cable (222) is obtained.

9. The form-finding design method for the annular truss-type radial ribbed cable net antenna according to claim 6, characterized in that, The specific process of S5 is: listing the force balance equations in the X and Y directions: Tij is the tension in the cable segment between nodes i and j, Lij is the length of the cable between nodes i and j, and Xi and Xj are the coordinates of nodes i and j; j denotes the node number connected to node i; e represents the total number of nodes connected to node i. The tension of the radial surface sheet (22) is brought into the equation, the tension of the central body upper chord cable segment (231) is solved, and then the tension of the central body vertical cable (232) is obtained.

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