A ring truss deployable radial ribbed cable net antenna and its deployment method

Abstract

This invention discloses a ring-shaped truss-type deployable radial rib cable mesh antenna and its deployment method, comprising a double-fold radial rib structure, circumferential cable segments, a metal mesh reflector, a central cable segment, and a single-ring deployable truss. The single-ring deployable truss is an overall ring structure, with the circumferential cable segments located inside the single-ring deployable truss. Multiple sets of double-fold radial rib structures are arranged in a circle and connected to the tops of multiple circumferential cable segments. The metal mesh reflector is connected to the top of the double-fold radial rib structure. The outer end of the double-fold radial rib structure is hinged to the top of the single-ring deployable truss, and the inner end is connected to the central cable segment. The double-fold radial rib structure is divided into two parts, front and rear, which are connected in series and hinged. The single-ring deployable truss is composed of multiple truss units connected end to end. Adjacent truss units are hinged using a parallelogram telescopic structure. It possesses the advantages of a large deployment-to-reception ratio and high stiffness of a ring-shaped truss antenna, and the high precision of a rib antenna.

Description

Technical Field

[0001] This invention belongs to the field of spaceborne ring deployable antennas, and relates to a ring truss type deployable radial rib cable net antenna and its deployment method. Background Technology

[0002] With the rapid development of aerospace technology, the demand for deployable spaceborne antennas in fields such as deep space communication, electronic reconnaissance, and national defense is becoming increasingly urgent. Before a rocket launch and orbit insertion, the antenna must be fully retracted into the rocket fairing, and can only be deployed after orbit is reached. Due to the limited payload capacity and space requirements of rockets, the retracted volume and overall mass of spaceborne antennas are greatly limited. Therefore, deployable antennas need to be characterized by small retracted volume and light weight. Compared to solid-state reflector antennas and inflatable reflector antennas, cable-net reflector antennas can maintain a certain degree of surface accuracy after deployment, and are therefore widely used.

[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 type deployable radial rib cable net antenna and its deployment method, which has the advantages of a large deployment-to-reception 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 deployable radial rib cable mesh antenna includes a double-fold radial rib structure, a ring cable segment, a metal wire mesh reflector, a central body cable segment, and a single-ring deployable truss.

[0007] The single-ring deployable truss is a ring structure. The circumferential cable segments are located inside the single-ring deployable truss. There are multiple circumferential cable segments with different diameters. They are arranged in multiple rings around the center circle according to the diameter from small to large. The central cable segment is located at the center of the circle. The height of the circumferential cable segments gradually decreases from the outside to the inside. The height of the central cable segment is lower than the height of the innermost circumferential cable segment.

[0008] Each set of double-fold radial rib structures is fan-shaped. Multiple sets of double-fold radial rib structures are arranged in a circle and connected to the top of multiple circumferential cable segments. The metal wire mesh reflective surface is connected to the top of the double-fold radial rib structure. The outer end of the double-fold radial rib structure is hinged to the top of the single-ring deployable truss, and the inner end is connected to the central body cable segment.

[0009] The double-fold radial rib structure is divided into two parts, front and back, which are connected in series and hinged. The single-ring deployable truss is composed of multiple truss units connected end to end; adjacent truss units are hinged by a parallelogram telescopic structure.

[0010] Preferably, the circumferential cable segment includes two horizontal circumferential cables at the top and bottom and a vertical adjusting cable in the middle, with a back cable net connected to the top of the vertical adjusting cable.

[0011] Preferably, the metal mesh reflective surface covers the double-fold radial rib structure to form a parabolic structure, the focal diameter ratio of the metal mesh reflective surface is the same as that of the double-fold radial rib structure, and the outer end of the metal mesh reflective surface is connected to the double-fold radial rib structure near the outer end.

[0012] Preferably, each set of double-fold radial rib structure includes a main rib, a first auxiliary rib, and a second auxiliary rib. There are two main ribs, which are respectively set on the outermost two sides. Several second auxiliary ribs are set between the two main ribs. A first auxiliary rib is set between the main rib and the second auxiliary rib, as well as between adjacent second auxiliary ribs. Each pair of adjacent ribs is connected by a circumferential cable segment. A metal wire mesh reflective surface is connected to the top of each rib.

[0013] Furthermore, the main rib is split in the middle into an inner main rib and an outer main rib. The inner and outer ends of the main rib and the inner and outer ends of the main rib are hinged together. The inner end of the main rib is connected to the central body cable segment, and the outer end of the main rib is hinged to the single-ring deployable truss.

[0014] Furthermore, the length of the first auxiliary rib is less than the outer length of the main rib, and its position is consistent with the outer side of the main rib; the length of the second auxiliary rib is less than the length of the main rib, and the second auxiliary rib is broken in the middle into the inner part of the second auxiliary rib and the outer part of the second auxiliary rib, with the inner and outer ends of the second auxiliary rib and the inner and outer ends of the second auxiliary rib hinged together.

[0015] Preferably, the main rib, the first auxiliary rib, and the second auxiliary rib are provided with two rows of holes near the upper edge, with the upper holes connecting to the metal wire mesh reflective surface and the lower holes connecting to the circumferential cable segment.

[0016] Preferably, the truss unit includes an upper horizontal bar, a lower horizontal bar, a vertical bar, a hingeless base plate, a hinged base plate, and a slider. The hingeless base plate and the hinged base plate are respectively connected to both ends of the vertical bar, and the slider is slidably connected to the vertical bar. The hingeless base plate and the hinged base plate of adjacent truss units are in opposite positions. The hinged base plate of one set of truss units is hinged to the slider of another set of truss units through the lower horizontal bar, and the slider is hinged to the hinged base plate of another set of truss units through the upper horizontal bar. The upper horizontal bar and the lower horizontal bar are parallel to each other.

[0017] Furthermore, the single-ring deployable truss is equipped with two drive cables, which pass through the upper and lower parts of the truss unit respectively. The two drive cables are arranged in the same way in each truss unit. One drive cable connects the upper parts of all truss units, and the other drive cable connects the lower parts of all truss units. For truss units with hinged bottom plates at the top, their sliders are connected to the drive cables located at the lower part of the truss unit. For truss units without hinged bottom plates at the top, their sliders are connected to the drive cables located at the upper part of the truss unit.

[0018] A method for deploying a ring-shaped truss-type deployable radial rib cable mesh antenna involves extending a single-ring deployable truss, which in turn opens the front and rear parts of the double-fold radial rib structure, allowing the metal mesh reflective surface to be deployed.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This invention combines a single-ring deployable truss with a double-folded rib structure to form a deployable antenna structure, simultaneously satisfying the characteristics of high convergence ratio, high rigidity, and high reflector surface precision. Furthermore, it achieves a deployable antenna structure, allowing for easy deployment in the air. This design not only maintains a stable shape during spatial deployment but also ensures that the antenna maintains an ideal parabolic shape during operation under high precision requirements, thereby meeting stringent electrical performance requirements. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the annular truss-type deployable radial rib cable net antenna of the present invention;

[0022] Figure 2 This is a schematic diagram of the double-fold radial rib structure of the annular truss-type deployable radial rib cable net antenna of the present invention.

[0023] Figure 3 This is a schematic diagram of the main rib structure of the annular truss-type deployable radial rib cable net antenna of the present invention.

[0024] Figure 4 This is a schematic diagram of the second auxiliary rib of the annular truss-type deployable radial rib cable net antenna of the present invention.

[0025] Figure 5This is a schematic diagram of a single-ring deployable truss for the annular truss-type deployable radial rib cable net antenna of the present invention.

[0026] Figure 6 This is a schematic diagram of the connection and driving method of the driving cable of the annular truss-type deployable radial rib cable net antenna of the present invention;

[0027] Figure 7 This is a schematic diagram of the overall collapsed state of the annular truss-type deployable radial rib cable net antenna of the present invention.

[0028] In the diagram, 1. Double-fold radial rib structure, 11. Main rib, 111. Inner part of main rib, 112. Outer part of main rib, 113. First connector, 114. Retaining ring, 115. Rotating shaft, 12. First auxiliary rib, 13. Second auxiliary rib, 131. Inner part of second auxiliary rib, 132. Outer part of second auxiliary rib, 133. Second connector, 2. Connecting block, 3. Single-ring deployable truss, 31. Upper horizontal bar, 32. Lower horizontal bar, 33. Inner vertical bar, 34. Outer vertical bar, 35. Hingeless base plate, 36. Hinged base plate, 37. Slider, 38. Pulley, 4. Circumferential cable segment, 5. Vertical adjustment cable, 6. Central body cable segment, 7. Back cable, 8. Metal wire mesh reflective surface, 9. Drive cable. Detailed Implementation

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] Example 1

[0035] like Figure 1 As shown, the annular truss-type deployable radial rib cable mesh antenna of the present invention includes a coaxial double-fold radial rib structure 1, annular cable segments 4, a metal wire mesh reflector 8, a central body cable segment 6, and a single-ring deployable truss 3.

[0036] The single-ring deployable truss 3 is a ring structure and is the outermost ring of the antenna. The circumferential cable segment 4 is located inside the single-ring deployable truss 3. There are multiple circumferential cable segments 4 with different diameters. They are arranged in multiple rings around the center circle according to the diameter from small to large. The central body cable segment 6 is located at the center of the circle. The height of the circumferential cable segments 4 gradually decreases from the outside to the inside. The height of the central body cable segment 6 is lower than the height of the innermost circumferential cable segment 4.

[0037] The circumferential cable segment 4 includes two horizontal circumferential cables, one above the other, and a vertical adjusting cable 5 in the middle. The vertical adjusting cable 5 is used to connect the two horizontal circumferential cables, and its top end is connected to the back cable net 7.

[0038] Each set of double-fold radial rib structure 1 is fan-shaped. Multiple sets of double-fold radial rib structure 1 are arranged in a circle and connected to the top of multiple circumferential cable segments 4. The metal wire mesh reflective surface 8 is set on the top of the double-fold radial rib structure 1. The single-ring deployable truss 3 provides boundary joints for the double-fold radial rib structure 1. The outer end of the double-fold radial rib structure 1 is fixed to the single-ring deployable truss 3. In the retracted state, the metal wire mesh reflective surface 8 and the double-fold radial rib structure 1 are placed inside the retracted single-ring deployable truss 3. When the single-ring deployable truss 3 is unfolded, it drives the internal double-fold radial rib structure 1 to unfold and provides pretension to make the double-fold radial rib structure 1 take shape.

[0039] The metal mesh reflective surface 8 covers the double-fold radial rib structure 1 to form a parabolic structure, and the focal diameter ratio of the metal mesh reflective surface 8 and the double-fold radial rib structure 1 is consistent.

[0040] The double-fold radial rib structure 1 is perpendicular to the parabolic direction. The outer end of the double-fold radial rib structure 1 is fixed to the single-ring deployable truss 3 via connecting block 2. The outer end of the metal wire mesh reflective surface 8 is connected to the double-fold radial rib structure 1 near its outer end. The inner end of the double-fold radial rib structure 1 is connected to the central body cable segment 6. That is, multiple sets of double-fold radial rib structures 1 are connected to the outer circumference of the central body cable segment 6, and these multiple sets of double-fold radial rib structures 1 are connected to each other via circumferential cable segments 4.

[0041] like Figure 2 As shown, each set of double-fold radial rib structure 1 includes a main rib 11, a first auxiliary rib 12 and a second auxiliary rib 13. The end facing the central body cable segment 6 is the inner end, and the end facing the single-ring unfoldable truss 3 as a whole is the outer end. There are two main ribs 11, which are respectively set on the outermost two sides. Several second auxiliary ribs 13 are set between the two main ribs 11. A first auxiliary rib 12 is set between the main ribs 11 and the second auxiliary ribs 13 and between adjacent second auxiliary ribs 13. Each pair of adjacent ribs is connected by a circumferential cable segment 4.

[0042] like Figure 3As shown, the main rib 11 is split in the middle into an inner main rib 111 and an outer main rib 112. The outer end of the inner main rib 111 and the inner end of the outer main rib 112 are connected in series by a first connecting piece 113. At both ends of the outer main rib 112, a hole is drilled 8mm from the upper and lower edges. The two holes at the outer end are hinged to the two holes of the connecting block 2 via a retaining ring 114 and a rotating shaft 115. One hole in the connecting block 2 is round, and the other is arc-shaped. The connecting block 2 is fixedly connected to the single-ring deployable truss 3. At the inner end of the outer main rib 112, the two holes are connected to the first connecting piece 113 via a retaining ring 114 and a rotating shaft 115. At the inner end of the inner main rib 111, a hole is drilled vertically 5mm from the upper and lower edges. The upper hole is connected to the central cable segment 6, and the lower hole is connected to the back cable net 7 via a vertical adjusting cable 5. At one of the outermost ends, a hole is drilled 8mm from the top and bottom edges. These two holes are hinged together by the retaining ring 114 and the first connecting piece 113 of the rotating shaft 115.

[0043] A row of top holes is drilled parallel to the upper edge of the main rib 112, with the top holes 3mm from the upper edge and adjacent top holes spaced 15mm horizontally. These top holes are used to connect the metal wire mesh reflective surface 8. A row of small holes is drilled 5mm from the upper and lower edges of the main rib 112, with each small hole spaced approximately 200mm horizontally. The upper holes are connected to the first auxiliary rib 12 and the second auxiliary rib 13 via circumferential cable segments 4, and the lower holes are connected to the back cable net 7 via vertical adjustment cables 5.

[0044] A row of top holes is drilled parallel to the upper edge inside the main rib 111, 3mm from the upper edge, with each hole horizontally spaced 15mm apart. These top holes are used to connect the metal wire mesh reflective surface 8. Another row of small holes is drilled inside the main rib 111 5mm from both the upper and lower edges, with the horizontal spacing of the holes gradually increasing from the inside to the outside. The upper holes are connected to the first auxiliary rib 12 and the second auxiliary rib 13 via circumferential cable segments 4, and the lower holes are connected to the back cable net 7 via vertical adjustment cables 5.

[0045] The first connector 113 has two connecting holes and one arc-shaped hole. The two connecting holes are used to fix the inner main rib 111 and the outer main rib 112 together via a retaining ring 114 and a rotating shaft 115. The arc-shaped hole is a quarter circle, and the two arc-shaped holes are arranged opposite to each other so that the inner main rib 111 and the outer main rib 112 fold in opposite directions. When the main rib 11 unfolds to a predetermined position under the action of the driving element, the arc-shaped hole can be used to limit the rib and maintain stability. The connecting block 2 has one connecting hole and one arc-shaped hole. The connecting hole is fixedly connected to the outer main rib 112 via 114 and a rotating shaft 115.

[0046] The first auxiliary rib 12 is perpendicular to the parabolic direction, with a row of top holes drilled 3mm from the top edge, and adjacent top holes are horizontally spaced 15mm apart. These top holes are used to connect the metal wire mesh reflective surface 8. Another row of small holes is drilled 5mm from both the top and bottom edges, with each small hole horizontally spaced approximately 200mm apart. The upper holes are connected to the main rib 11 and the second auxiliary rib 13 via circumferential cable segments 4, and the lower holes are connected to the back cable net 7 via vertical adjustment cables 5. The length of the first auxiliary rib 12 is less than the length of the outer rib 112 of the main rib, and its position is consistent with the outer rib 112 of the main rib. However, the first auxiliary rib 12 does not have end holes and is not connected to the central body cable segment 6 or the single-ring deployable truss 3.

[0047] like Figure 4 As shown, the second auxiliary rib 13 is shorter than the main rib 11. The second auxiliary rib 13 does not have end holes and is not connected to the central cable segment 6 or the single-ring deployable truss 3. The second auxiliary rib 13 is composed of an inner second auxiliary rib 131 and an outer second auxiliary rib 132. The outer end of the inner second auxiliary rib 131 and the inner end of the outer second auxiliary rib 132 are hinged together by a second connector 133. At the outermost end of the inner second auxiliary rib 131, 8mm from both the upper and lower edges, there is a hole. These two holes are hinged to the second connector 133 via a retaining ring 114 and a rotating shaft 115. The inner auxiliary rib 131, perpendicular to the parabolic direction, has a row of top holes 3mm from the upper edge, with adjacent top holes horizontally spaced 15mm apart. These top holes are used to connect the metal wire mesh reflective surface 8. Drill a row of small holes 5mm from the top and bottom edges, with each hole spaced about 200mm apart horizontally. The upper hole is connected to the first auxiliary rib 12, the third auxiliary rib 14, the second auxiliary rib 13 and the main rib 11 via the circumferential cable segment 4. The lower hole is connected to the back cable net 7 via the vertical adjustment cable 5.

[0048] like Figure 1 As shown, the single-ring deployable truss 3 is composed of multiple truss units connected end to end; adjacent truss units are hinged by a parallelogram telescopic structure.

[0049] like Figure 5As shown, the truss unit includes an upper horizontal bar 31, a lower horizontal bar 32, an inner vertical bar 33, an outer vertical bar 34, a hingeless base plate 35, a hinged base plate 36, and a slider 37. The inner vertical bar 33 and the outer vertical bar 34 are of equal length and parallel to each other. The hingeless base plate 35 and the hinged base plate 36 are respectively connected to the two ends of the inner vertical bar 33 and the outer vertical bar 34. The slider 37 is slidably connected to the inner vertical bar 33 and the outer vertical bar 34. Each group of truss units is connected end to end by the upper horizontal bar 31 and the lower horizontal bar 32. The hingeless base plate 35 and the hinged base plate 36 of adjacent truss units are in opposite positions. The hinged base plate 36 of one group of truss units is hinged to the slider 37 of another group of truss units through the lower horizontal bar 32. The slider 37 is hinged to the hinged base plate 36 of another group of truss units through the upper horizontal bar 31 and slides up and down along the inner vertical bar 33 and the outer vertical bar 34. The upper crossbar 31 and the lower crossbar 32 are installed parallel to each other on both sides of each group of sliders 37 and hinged base plate 36, and the upper crossbar 31 and the lower crossbar 32 are hinged to the sliders 37 and the hinged base plate 36.

[0050] The single-ring deployable truss 3 has two drive cables 9, which pass through the upper and lower parts of the truss unit respectively. The two drive cables 9 are arranged identically in each truss unit; one drive cable 9 connects the upper parts of all truss units, and the other drive cable 9 connects the lower parts of all truss units. For truss units with a hinged base plate 36 at the top, their sliders 37 are connected to the drive cables 9 located at the lower part of the truss unit. For truss units without a hinged base plate 35 at the top, their sliders 37 are connected to the drive cables 9 located at the upper part of the truss unit. Figure 6 As shown. Pullers are located at three points: the connection point between the hinged base plate 36 and the upper crossbar 31, the connection point between the lower crossbar 32 and the slider 37, and inside the hingeless base plate 35. The drive cable 9 passes through the pulley at the slider 37 from inside the hingeless base plate 35, and then passes through the pulley at the hinged base plate 36.

[0051] The number of main ribs 11 is the same as the number of truss units. The outer ends of the main ribs 112 are hinged to the hinged base plate 36 or the hingeless base plate 35 at the top of the truss unit via connecting blocks 2.

[0052] The cable net antenna of this invention has two driving ropes, a total of 18 truss units, and 9 radial rib units. Each radial rib unit consists of one main rib and five auxiliary ribs. When it is folded up, its diameter is only 240mm, its overall folded height is 500mm, and its overall unfolded diameter is 2m.

[0053] Example 2

[0054] The deployment process of the aforementioned ring-shaped truss-type deployable radial rib cable net antenna is as follows:

[0055] The single-ring deployable truss 3 is extended, which in turn opens the front and rear parts of the double-fold radial rib structure 1, allowing the metal mesh reflective surface 8 to be unfolded.

[0056] During antenna deployment, the drive cable 9 is tightened, and the slider 37, driven by the drive cable 9, moves along the inner vertical bar 33 and the outer vertical bar 34 toward the hingeless base plate 35. The upper horizontal bar 31 and the lower horizontal bar 32 also slide up and down accordingly. As the upper horizontal bar 31 and the lower horizontal bar 32 reach a horizontal state, the single-ring deployable truss 3 is fully deployed.

[0057] The main rib 11 unfolds in the middle through the first connector 113, and its outer end unfolds with the single-ring unfoldable truss 3 through the connecting block 2. The second auxiliary rib 13 also unfolds through the first connector 113, thus completing the unfolding of the double-fold radial rib structure 1.

[0058] 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.

[0059] 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 ring-shaped truss-type deployable radial rib cable net antenna, characterized in that, It includes a double-fold radial rib structure (1), a circumferential cable segment (4), a metal wire mesh reflective surface (8), a central body cable segment (6), and a single-ring deployable truss (3). The single-ring deployable truss (3) is a ring structure. The circumferential cable segments (4) are located inside the single-ring deployable truss (3). There are multiple circumferential cable segments (4), and the diameters of the multiple circumferential cable segments (4) are different. They are arranged in multiple rings in a central circle according to the diameter from small to large. The central body cable segment (6) is located at the center of the circle. The height of the circumferential cable segments (4) gradually decreases from the outside to the inside. The height of the central body cable segment (6) is lower than the height of the innermost circumferential cable segment (4). Each set of double-fold radial rib structure (1) is fan-shaped. Multiple sets of double-fold radial rib structure (1) are arranged in a circle and connected to the top of multiple circumferential cable segments (4). The metal wire mesh reflective surface (8) is connected to the top of the double-fold radial rib structure (1). The outer end of the double-fold radial rib structure (1) is hinged to the top of the single-ring deployable truss (3), and the inner end is connected to the central body cable segment (6). The double-fold radial rib structure (1) is divided into two parts from the middle, and the two parts are connected in series and hinged. The single-ring deployable truss (3) is composed of multiple truss units connected end to end; the adjacent truss units are connected by a parallelogram telescopic structure. The circumferential cable segment (4) includes two horizontal circumferential cables at the top and bottom and a vertical adjustment cable (5) in the middle. The top of the vertical adjustment cable (5) is connected to a back cable net (7). Each double-fold radial rib structure (1) includes a main rib (11), a first auxiliary rib (12) and a second auxiliary rib (13). There are two main ribs (11), which are set on the outermost two sides respectively. Several second auxiliary ribs (13) are set between the two main ribs (11). A first auxiliary rib (12) is set between the main rib (11) and the second auxiliary rib (13) and between adjacent second auxiliary ribs (13). Each pair of adjacent ribs is connected by a circumferential cable segment (4). A metal wire mesh reflective surface (8) is connected to the top of each rib. The main rib (11) is split in the middle into the inner main rib (111) and the outer main rib (112). The outer end of the inner main rib (111) and the inner end of the outer main rib (112) are hinged together. The inner end of the inner main rib (111) is connected to the central body cable segment (6), and the outer end of the outer main rib (112) is hinged to the single-ring deployable truss (3). The length of the first auxiliary rib (12) is less than the length of the outer main rib (112), and its position is consistent with that of the outer main rib (112); the length of the second auxiliary rib (13) is less than the length of the main rib (11), and the second auxiliary rib (13) is broken in the middle into the inner second auxiliary rib (131) and the outer second auxiliary rib (132), and the outer end of the inner second auxiliary rib (131) and the inner end of the outer second auxiliary rib (132) are hinged together.

2. The annular truss-type deployable radial rib cable net antenna according to claim 1, characterized in that, The metal mesh reflective surface (8) covers the double-fold radial rib structure (1) to form a parabolic structure. The focal diameter ratio of the metal mesh reflective surface (8) and the double-fold radial rib structure (1) is the same. The outer end of the metal mesh reflective surface (8) is connected to the double-fold radial rib structure (1) near the outer end.

3. The annular truss-type deployable radial rib cable net antenna according to claim 1, characterized in that, The main rib (11), the first auxiliary rib (12), and the second auxiliary rib (13) have two rows of holes near the upper edge. The upper hole is connected to the metal wire mesh reflective surface (8), and the lower hole is connected to the circumferential cable section (4).

4. The annular truss-type deployable radial rib cable net antenna according to claim 1, characterized in that, The truss unit includes an upper horizontal bar (31), a lower horizontal bar (32), a vertical bar, a hingeless base plate (35), a hinged base plate (36), and a slider (37). The hingeless base plate (35) and the hinged base plate (36) are respectively connected to the two ends of the vertical bar. The slider (37) is slidably connected to the vertical bar. The hingeless base plate (35) and the hinged base plate (36) of adjacent truss units are in opposite positions. The hinged base plate (36) of one set of truss units is hinged to the slider (37) of another set of truss units through the lower horizontal bar (32). The slider (37) is hinged to the hinged base plate (36) of another set of truss units through the upper horizontal bar (31). The upper horizontal bar (31) and the lower horizontal bar (32) are parallel to each other.

5. The annular truss-type deployable radial rib cable net antenna according to claim 4, characterized in that, The single-ring deployable truss (3) is provided with two drive cables (9). The two drive cables (9) pass through the upper and lower parts of the truss unit respectively. The two drive cables (9) are set in the same way in each truss unit. One drive cable (9) connects the upper part of all truss units, and the other drive cable (9) connects the lower part of all truss units. The slider (37) of the truss unit with the hinged base plate (36) at the top is connected to the drive cable (9) located at the lower part of the truss unit. The slider (37) of the truss unit without the hinged base plate (35) at the top is connected to the drive cable (9) located at the upper part of the truss unit.

6. A method for deploying a ring-shaped truss-type deployable radial rib cable net antenna according to any one of claims 1-5, characterized in that, The single-ring deployable truss (3) is extended, which in turn opens the front and rear parts of the double-fold radial rib structure (1), allowing the metal mesh reflective surface (8) to be unfolded.

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