Ultra-large aperture radar antenna and pitch angle rotation method

Abstract

The present invention discloses an ultra-large aperture radar antenna and a pitch angle rotation method. The radar antenna comprises: an antenna frame, an antenna back frame, a rotating gear, a connecting crossbeam, a support arm and a truss. The antenna back frame is located at the transverse connection of multiple sub-frames of the antenna frame, one side of which is longitudinally connected to the antenna frame, the support arm is connected to the antenna back frame, the rotating gear is located between a pair of support arms and is fixedly connected to the other side of the antenna back frame. The antenna back frame is driven by the rotating gear to rotate the antenna frame in the pitch direction. The two ends of the connecting crossbeam are respectively fixedly connected to the rotating gear. The truss is located under the rotating gear, and the two ends of the truss are respectively fixedly connected to the pair of support arms, so that the antenna frame, the antenna back frame, the rotating gear and the connecting crossbeam form an "arch bridge" closed rigid whole, and the antenna back frame, the support arm and the truss form a "convex" shaped closed rigid whole. The present invention can ensure the rigidity of the ultra-large aperture radar antenna.

Description

Technical Field

[0001] The present invention relates to the technical field of radar antennas, and in particular to an ultra-large aperture radar antenna and a pitch angle rotation method. Background Art

[0002] To improve the range and power of space detection, radars are developing ultra-large antenna arrays. Ultra-large radar antennas are generally fixed, land-based structures. Fixed radars can be categorized by rotational type, including those fixed in both azimuth and elevation, those with azimuth rotation and fixed pitch, and those with azimuth rotation and pitch rotation. Ultra-long-range space detection generally uses a pitch rotational structure. Existing radar antennas with rotatable elevation typically have a mechanical aperture of approximately 10 meters by 10 meters, with the elevation rotation axis located at either end of the antenna system, providing good rotational rigidity. As the mechanical aperture of ultra-large arrays increases, especially when the mechanical aperture exceeds the length required for single-vehicle road transport, the antenna frame must be spliced from two or more units along the rotation axis. In this case, conventional structures with elevation axes located at either end of the antenna system result in an extremely large span for the elevation support and poor rigidity for the connected antenna frames, thus affecting the radar's mechanical pointing accuracy.

[0003] The existing technology, the invention patent application publication number CN114799746A, is a shaft system processing method and assembly method for a large-span radar turntable. Gravity is provided by a load plate to simulate the angle change of the pitch arm under the action of gravity, and the shaft hole is processed in a simulated use state to ensure that the accuracy in the use state meets the requirements. The shaft holes on both sides are processed separately by the rotation angle to avoid the influence of the rotation shaft angle on the processing accuracy and improve the pointing accuracy of the antenna array. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to solve the problem that when the existing pitch rotation axis is used to fix an ultra-large radar antenna, the span of the pitch rotation axis at both ends increases, making the rigidity of the connected antenna frame poor, thereby affecting the mechanical pointing accuracy of the radar.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A super-large aperture radar antenna comprises: an antenna frame, a pair of antenna back frames, a pair of rotating gears, a connecting beam, a pair of support arms and a truss, wherein the pair of antenna back frames are located at the lateral connection of multiple sub-frames of the antenna frame, and one side thereof is longitudinally connected to the antenna frame, a pair of support arms are respectively connected to the antenna back frames, a pair of rotating gears are located between the pair of support arms, and are respectively fixedly connected to the other side faces of the antenna back frames, the antenna back frames are driven by the rotating gears to rotate the antenna frame in the pitch direction, the two ends of the connecting beam are respectively fixedly connected to the pair of rotating gears, the truss is located under the pair of rotating gears, and the two ends thereof are respectively fixedly connected to the pair of support arms, so that the antenna frame, the pair of antenna back frames, the pair of rotating gears and the connecting beam form an "arch bridge" closed rigid whole, and the pair of antenna back frames, the pair of support arms and the truss form a "convex" shaped closed rigid whole.

[0007] Advantages: The "arch bridge" closed rigid structure can support the rotation of the ultra-large and heavy-loaded antenna array while also balancing the rotational torque. The "convex" closed rigid structure prevents internal collapse and deformation under a load of nearly 1,000 tons.

[0008] In one embodiment of the present invention, the antenna unit is installed on the front of the antenna frame, and the back thereof is fixedly connected to a pair of antenna back frames, and the antenna frame is fixedly connected by a plurality of sub-frames arranged in combination to form a first transverse connection and a second transverse connection.

[0009] In one embodiment of the present invention, a pair of antenna back frames include a first antenna back frame and a second antenna back frame, the first antenna back frame is located at the first transverse connection, the second antenna back frame is located at the second transverse connection, and one side of the first antenna back frame and the second antenna back frame is fixedly connected to the antenna frame.

[0010] In one embodiment of the present invention, a pair of the arms include a first arm and a second arm, the first arm is fixedly connected to the first antenna back frame, the second arm is fixedly connected to the second antenna back frame, the first antenna back frame and the second antenna back frame are located between the first arm and the second arm, and the first antenna back frame and the second antenna back frame rotate around the pair of arms as a fulcrum.

[0011] In one embodiment of the present invention, each of the arms includes a base, a first upward-looking sub-arm, a second upward-looking sub-arm, a third upward-looking sub-arm and a fourth upward-looking sub-arm, one end face of the base is fixedly connected to the ground, the first upward-looking sub-arm, the second upward-looking sub-arm, the third upward-looking sub-arm and the fourth upward-looking sub-arm are fixedly connected to the other side face of the base in sequence, and from a top-down angle, the planar length of the base is greater than the planar length of the first to fourth upward-looking sub-arms and each upward-looking sub-arm, and the planar width of the base is the same as the planar width of the first upward-looking sub-arm and the second upward-looking sub-arm.

[0012] In one embodiment of the present invention, a pair of rotating gears includes a first rotating gear and a second rotating gear, the first rotating gear is fixedly connected to the other side of the first antenna back frame, and the second rotating gear is fixedly connected to the other side of the second antenna back frame, and each of the rotating gears is composed of multiple pairs of gear ring segments and spokes, and the meshing teeth on the gear ring are located on the outer ring of the gear ring.

[0013] In one embodiment of the present invention, the ultra-large aperture radar antenna further includes a driving device, the driving device including a first driving device and a second driving device, the first driving device being fixedly connected to one end of the truss, the second driving device being fixedly connected to the other end of the truss, the first driving device and the driving device being respectively composed of two sub-driving devices, and the two sub-driving devices being arranged on the same side and performing electrical elimination simultaneously.

[0014] In one embodiment of the present invention, each of the sub-drive devices includes a drive motor, a reducer, a coupling, a meshing gear and a mounting bracket. Each of the sub-drive devices is fixedly connected to the truss through the mounting bracket. The reducer is fixedly connected to the output shaft of the drive motor. The reducer is fixedly connected to the meshing gear through the coupling, and the meshing gear is engaged with the teeth of the rotating gear. The ultra-large aperture radar antenna also includes a braking device, which is fixedly connected to the truss and is located on a side close to a pair of pitch arms. Under normal circumstances, the braking device brakes the rotating gear. When the pitch angle of the antenna frame needs to be adjusted, the braking device releases the rotating gear and drives the antenna back frame through the rotating gear to adjust the pitch angle of the antenna frame.

[0015] In one embodiment of the present invention, the braking device includes a first braking device and a second braking device, the first braking device is fixedly connected to one end of the truss, and the second braking device is fixedly connected to the other end of the truss, and each of the braking devices includes a fixing frame, a brake caliper and a brake disc, the brake caliper is fixedly connected to the truss through the fixing frame, the brake disc is arc-shaped, one side of which is in contact with one side of the rotating gear and fixedly connected thereto, and both ends of the brake disc are fixedly connected to the antenna back frame.

[0016] The present invention also provides a method for rotating the pitch angle of an ultra-large aperture radar antenna, comprising:

[0017] The braking device releases the rotating gear, and the driving motor drives the meshing gear to engage with the rotating gear, driving the rotating gear to rotate in the pitch direction. The rotating gear drives the antenna frame to rotate in the pitch direction through the antenna back frame. When the antenna frame rotates to the required pitch angle, the driving motor stops driving the meshing gear, and then brakes the rotating gear with the braking device to lock the pitch rotation of the antenna frame.

[0018] Compared with the prior art, the beneficial effects of the present invention are: it can meet the mechanical aperture azimuth length and elevation height of the antenna skeleton of more than 30 meters, so that the mechanical area of the antenna skeleton is about 1,000 square meters. The "arch bridge" closed rigid whole can support the rotation of the super-large heavy-load antenna array on the one hand, and on the other hand, the balance structure of the rotation torque is formed by the "convex" shaped closed rigid whole to prevent the internal collapse deformation of nearly a thousand tons of load. The rotating shaft device has the functions of centering and axial movement to adapt to the structural deformation caused by temperature difference and gravity. The drive device composed of four sub-drive devices, two of which are set on the same side and electrically eliminated at the same time, can effectively eliminate the distortion of the super-large span antenna array in the gap elimination process, thereby improving the transmission torsional stiffness of the radar. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is a schematic diagram of an ultra-large aperture radar antenna according to an embodiment of the present invention.

[0020] Figure 2 Schematic diagram of a support arm according to an embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the "arch bridge type" closed rigid overall structure of an embodiment of the present invention.

[0022] Figure 4 Schematic diagram of a rotating shaft device according to an embodiment of the present invention.

[0023] Figure 52 is a cross-sectional view of a rotating shaft device according to an embodiment of the present invention.

[0024] Figure 6 Schematic diagram of a driving device according to an embodiment of the present invention.

[0025] Figure 7 Schematic diagram of a braking device according to an embodiment of the present invention.

[0026] Figure 8 Schematic diagram of a brake disc according to an embodiment of the present invention.

[0027] Figure 9 This is a schematic diagram of a "convex"-shaped closed rigid overall structure according to an embodiment of the present invention.

[0028] Figure 10 This is an enlarged view of a buffer component according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] To facilitate those skilled in the art to understand the technical solution of the present invention, the technical solution of the present invention is further described with reference to the accompanying drawings.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0031] See also Figure 1 As shown, the present invention provides an ultra-large aperture radar antenna, comprising an antenna frame 100, a pair of antenna backing frames 200, a pair of supporting arms 300, a pair of rotating gears 400, a connecting beam 500, and a truss 600. The pair of antenna backing frames 200 are located at the lateral connection between the multiple sub-frames 110 of the antenna frame 100, and one side of the pair of antenna backing frames 200 is longitudinally connected to the antenna frame 100. A pair of supporting arms 300 are respectively connected to the antenna backing frames 200. A pair of rotating gears 400 are located between the pair of supporting arms 300 and are respectively fixedly connected to the other side of the antenna backing frames 200. The rotating gears 400 drive the antenna backing frames 200, causing the antenna frame 100 to rotate in pitch and elevation. The two ends of the connecting beam 500 are respectively fixedly connected to a pair of rotating gears 400. The truss 600 is located under the pair of rotating gears 400, and its two ends are respectively fixedly connected to a pair of support arms 300, so that the antenna frame 100, the pair of antenna back frames 200, the pair of rotating gears 400 and the connecting beam 500 form an "arch bridge" closed rigid whole, and the pair of antenna back frames 200, the pair of support arms 300 and the truss 600 form a "convex" shaped closed rigid whole.

[0032] See also Figure 1 and stated Figure 3 As shown, in one embodiment of the present invention, the antenna frame 100 has antenna units mounted on its front surface and is fixedly connected to a pair of antenna frames 200 on its back surface. The antenna frame 100 is composed of a plurality of sub-frames 110 arranged in an arrangement and connected by locating pins and bolts. In this embodiment, the antenna frame 100 comprises 39 sub-frames 110 arranged in 13 rows and 3 columns. This gives the antenna frame 100 a mechanical aperture of over 30 meters in both azimuth and elevation, resulting in a mechanical area of approximately 1,000 square meters. The transverse connections between the sub-frames 110 include a first transverse connection 110A and a second transverse connection 110B.

[0033] See also Figure 1 and stated Figure 3 As shown, in one embodiment of the present invention, a pair of antenna frames 200 includes a first antenna back frame 210 and a second antenna back frame 220. The first antenna back frame 210 is located at the first transverse connection 110A, and the second antenna back frame 220 is located at the second transverse connection 110B. Both are longitudinally connected to the antenna frame 100 at the transverse connection via locating pins and bolts. Each antenna frame has a chamfered surface 230 and a fixing axis hole 240 at both ends.

[0034] See also Figure 2 and stated Figure 3As shown, in one embodiment of the present invention, a pair of arms includes a first arm 310 and a second arm 320. The first arm 310 is fixedly connected to the first antenna backing 210, and the second arm 320 is fixedly connected to the second antenna backing 220. The first antenna backing 210 and the second antenna backing 220 are located between the two arms, and the first antenna backing 210 and the second antenna backing 220 rotate around the pair of arms. For ease of transportation, the first arm 310 and the second arm 320 are divided into sections. The first arm 310 and the second arm 320 have the same structural composition, connection relationship, and operating principle. For the sake of brevity, only the first arm 310 will be described in detail. The first arm 310 includes a base 311, a first upward-looking sub-arm 312, a second upward-looking sub-arm 313, a third upward-looking sub-arm 314, and a fourth upward-looking sub-arm 315. One end of the base 311 is fixedly connected to the ground A via anchor bolts (not labeled in the figure), and the first upward-looking sub-arm 312, the second upward-looking sub-arm 313, the third arm 314, and the fourth arm 315 are, in turn, fixedly connected to one end of the other side of the base 311. When viewed from above, the planar length of the base 311 is greater than the planar length of the first to fourth upward-looking sub-arms 312 to 315, and the planar width of the base 311 is the same as the planar width of the first and second upward-looking sub-arms 312 and 313. The first and second upward-looking sub-arms 312 and 313 have the same structure, each being a rectangular block. The third upward-facing sub-arm 314 is a trapezoidal block with a narrowed upper end. The fourth upward-facing sub-arm 315 is a rectangular block with a beveled side facing away from the antenna backing 200. In this embodiment, the antenna frame 100, driven by the rotating gear 400, can rotate 150° from -60° to +90°. The beveled side of the fourth arm 315, facing away from the antenna backing 200, prevents the antenna frame 100 from contacting or colliding with the fourth upward-facing sub-arm 315 when rotating to -60°. In this embodiment, each upward-facing sub-arm is 2.7 meters high. The ultra-large aperture radar antenna also includes a rotating shaft device and multiple auxiliary parts 1100. The rotating shaft device includes a first rotating shaft 710 and a second rotating shaft 720, whose bottoms are respectively fixed to a pair of arms, and their output shafts are respectively located in the fixed shaft holes 240 of the first antenna back frame 210 and the second antenna back frame 220. The two ends of the multiple auxiliary parts 1100 are respectively fixedly connected to the antenna frame 200 and the rotating gear 400.

[0035] See also Figures 1 to 3As shown, in one embodiment of the present invention, the rotating gear 400 includes a first rotating gear 410 and a second rotating gear 420. The first rotating gear 410 is fixedly connected to the first antenna back frame 210, and the second rotating gear 420 is fixedly connected to the second antenna back frame 210. Each rotating gear is composed of a multi-segment ring gear 411 combined with spokes, and the meshing teeth on the ring gear 411 are located on the outer ring of the rotating gear 400. One end of a plurality of auxiliary parts 1100 is fixedly connected to the other side of the antenna frame 200, and the other end is fixedly connected to the inner ring of the rotating gear 400. Specifically, the rotating gear 400 is a shaftless or virtual shaft type gear, and the number of the multi-segment ring gear 410 is, for example, 6.

[0036] See also Figures 1 to 3 As shown, in one embodiment of the present invention, there are multiple connecting beams 500, for example, two, with each connecting beam 500 having its ends fixedly connected to the ring gears 411 of the first rotating gear 410 and the second rotating gear 420. The antenna frame 100, the pair of antenna back frames 200, the pair of rotating gears 400, and the connecting beams 500 form a closed, rigid "arch bridge" structure that supports the rotation of the ultra-large, heavy-loaded antenna array and balances the rotational torque.

[0037] See also Figures 1 to 3 As shown, in one embodiment of the present invention, the truss 600 includes a first truss 610, a second truss 620, and a third truss 630. One end of the first truss 610 is fixedly connected to the second upward-looking sub-arm 313 of the first arm 310, and one end of the third truss 630 is fixedly connected to the second upward-looking sub-arm 313 of the second arm 320. The two ends of the second truss 620 are fixedly connected to the other end of the first truss 610 and the other end of the third truss 630, respectively. In this embodiment, the height of the first arm 310 and the second arm 320 and the distance between them are both 16 meters.

[0038] A pair of antenna back frames 200, a pair of support arms 300 and a truss 600 form a "convex" shaped closed rigid whole to prevent internal collapse deformation under a load of nearly a thousand tons.

[0039] See also Figures 2 to 5As shown, in one embodiment of the present invention, the first rotating shaft 710 and the second rotating shaft 720 have the same structure, connection relationship, and operating principle. This embodiment will be described using the first rotating shaft 710 as an example. The first rotating shaft 710 includes an upper bearing seat 711, a lower bearing seat 712, a pitch axis 713, a rotary transformer 714, a centering shaft 715, and a pressure plate 716. The lower bearing seat 712 is fixedly connected to the top surface of the fourth support arm 315. The upper bearing seat 711 and the lower bearing seat 712 are fixedly connected or integrally formed. The pitch axis 713, rotary transformer 714, centering shaft 715, and fixed pressure plate 716 are located within the upper bearing seat 711. Specifically, the rotary transformer 714 is coaxially mounted with the pitch axis 713 and fixedly connected via bolts. The rotary transformer 714 engages with a portion of the pitch axis 713 to accurately measure the pitch angle of the radar antenna. The inner ring of the centering shaft 713 is fixedly connected to the rest of the pitch axis 713. The centering bearing 713 has a certain angular deviation to accommodate the poor rigidity and deformation of long-span antennas. The inner ring of the pressure plate 716 is fixedly connected to the outer ring of the centering shaft 713, and the outer ring of the pressure plate 716 is fixedly connected to the upper bearing seat 711. This allows the rotating shaft assembly 700 to achieve both centering and axial movement to accommodate structural deformation caused by temperature differences and gravity.

[0040] See also Figure 2 and Figure 6As shown, in one embodiment of the present invention, the ultra-large aperture radar antenna further includes a drive device 800 and a brake device. The drive device 800 and the brake device are fixedly connected to the truss 600. One side of the brake device is located near the first support arm 310, and the drive device 800 is located on the other side of the brake device. The drive device 800 includes a first drive device 810 and a second drive device 820. The first drive device 810 is fixedly connected to the third truss 630, and the second drive device 820 is fixedly connected to the first truss 610. The first drive device 810 and the second drive device 820 each comprise two sub-drive devices, meaning that the drive device 800 comprises four sub-drive devices, with the two sub-drive devices being located on the same side and electrically canceling each other. This effectively eliminates distortion of the ultra-large span antenna array during the clearance elimination process, thereby improving the radar's transmission torsional stiffness. Specifically, each sub-drive device includes a drive motor 811, a reducer 812, a coupling 813, a meshing gear 814, and a mounting bracket 815. Each sub-drive device is fixedly connected to the truss 600 via the mounting bracket 815. The reducer 812 is fixedly connected to the output shaft of the drive motor 811. The reducer 812 is fixedly connected to the meshing gear 814 via the coupling 813, and the meshing gear 814 meshes with the teeth of the rotating gear 400. The drive motor 811 provides power to the drive device 800. The meshing gear 814 meshes with the teeth of the rotating gear 400 through the reducer 812 and the coupling 813. The pitch angle of the antenna frame 100 is adjusted by rotating the gear 400.

[0041] See also Figure 1 、 Figure 7 and 8As shown, in one embodiment of the present invention, the brake device 900 includes a first brake device 910 and a second brake device (not labeled in the figure). The first brake device 910 is fixedly connected to the first truss 610, and the second brake device is fixedly connected to the third truss 630. Each brake device includes a fixing frame 911, a brake caliper 912, and a brake disc 913. The brake caliper 912 is fixedly connected to the truss 600 via the fixing frame 911. The brake disc 913 is arc-shaped, with one side contacting and fixedly connected to one side of the rotating gear 400. Both ends of the brake disc 913 are fixedly connected to the antenna back frame 200. The brake caliper 912 is hydraulic or multi-electromagnetic. The braking system of the brake caliper 912 is in normally closed mode. The brake caliper 912 clamps the brake disc 913 to brake the rotating gear 400 and maintain the pitch angle of the antenna frame 100. When the pitch angle of the antenna frame 100 needs to be adjusted, the brake caliper 912 is turned on, the brake caliper 912 releases the brake disc 913, and the driving device 800 is turned on. The meshing gear 814 engages with the rotating gear 400 to rotate the rotating gear 400 in the pitch direction. The rotating gear 400 drives the antenna frame 100 to rotate in pitch through the antenna back frame 200. When the antenna frame 100 rotates to the required pitch angle, the driving device 800 is turned off, and the brake caliper 912 is braked to brake the rotating gear 400 and lock the pitch rotation of the antenna frame 100. In one embodiment of the present invention, the ultra-large aperture radar antenna also includes a main controller, which is communicatively connected to the rotating axis device, the driving device 800 and the braking device 900. The main controller controls the rotating axis device to accurately measure the pitch angle of the radar antenna, controls the driving device 800 to drive the rotating gear 400 to rotate and adjust the pitch angle, and controls the braking device 900 to engage the brake disc 913 and brake the rotating gear 400 when the antenna frame 100 rotates to the required pitch angle, thereby locking the pitch rotation of the antenna frame 100.

[0042] See also Figure 1 、 2 , 9 and Figure 10In one embodiment of the present invention, the ultra-large aperture radar antenna further includes a buffer member 1200, a first auxiliary member 1300, and a second auxiliary member 1400. The buffer member 1200 comprises a mounting bracket 1210, a reinforcement member 1220, and a damping member 1230. The mounting bracket 1210 is L-shaped, with one side fixedly connected to the base 311. The reinforcement member 1220 is fixedly connected to the mounting bracket 1210 on both sides. The damping member 1230 passes through the other side of the mounting bracket 1210, facing the antenna frame 100. When the antenna frame 100 exceeds a specified elevation angle, it encounters the damping member 1230, slowing its movement until it stops. A pair of first auxiliary members 1300 are fixedly connected to the first arm 310 and the second arm 320, respectively. One end of the first auxiliary member 1300 is fixedly connected to the other end of the top surface of the base 311, and the other end of the first auxiliary member 1300 is fixedly connected to the third upward-looking sub-arm 314. There are multiple buffers 1200, each mounted on a pair of first auxiliary members 1300. When the antenna frame 100 exceeds a specified elevation angle, it encounters the damping buffer 1230, slowing its movement until it comes to a stop. A pair of second auxiliary members 1400 reinforce the connection between the first and second arms 310, 320, and the truss 600. One end of one second auxiliary member 1400 is fixedly connected to the first truss 610, and the other end is fixedly connected to the second upward-facing sub-arm 312. Another second auxiliary member 1400 has one end fixedly connected to the third truss 630, and the other end is fixedly connected to the third upward-facing sub-arm 314 of the other arm.

[0043] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description. It is intended that all variations within the meaning and range of equivalents of the claims be embraced herein, and any reference signs in the claims should not be construed as limiting the claims to which they relate.

[0044] The above-mentioned embodiments merely represent the implementation methods of the invention. The protection scope of the present invention is not limited to the above-mentioned embodiments. For those skilled in the art, several variations and improvements can be made without departing from the concept of the present invention, which all fall within the protection scope of the present invention.

Claims

1. An ultra-large aperture radar antenna, characterized in that: include: An antenna frame, a pair of antenna back frames, a pair of rotating gears, a connecting crossbeam, a pair of supporting arms, a truss, a driving device, and a braking device. The pair of antenna back frames are located at the transverse connection of multiple sub-frames of the antenna frame, and one side of each of the antenna back frames is longitudinally connected to the antenna frame. The pair of supporting arms are respectively connected to the antenna back frames. The pair of rotating gears are located between the pair of supporting arms and are respectively fixedly connected to the other side of the antenna back frames. The antenna back frames are driven by the rotating gears to rotate the antenna frame in the pitch direction. The two ends of the connecting crossbeam are respectively fixedly connected to the pair of rotating gears. The truss is located below the pair of rotating gears and the two ends of the truss are respectively fixedly connected to the pair of supporting arms. The antenna frame, the pair of antenna back frames, the pair of rotating gears, and the connecting crossbeam form an "arch bridge" closed rigid whole. The pair of antenna back frames, the pair of supporting arms, and the truss form a "convex" shaped closed rigid whole. The driving device includes a first driving device and a second driving device, the first driving device is fixedly connected to one end of the truss, and the second driving device is fixedly connected to the other end of the truss. The first driving device and the driving device are respectively composed of two sub-driving devices, and the two sub-driving devices are arranged on the same side and perform electrical elimination at the same time; The braking device includes a first braking device and a second braking device, the first braking device is fixedly connected to one end of the truss, and the second braking device is fixedly connected to the other end of the truss; Each of the braking devices includes a fixing frame, a brake caliper and a brake disc. The brake caliper is fixedly connected to the truss through the fixing frame. The brake disc is arc-shaped, one side of which fits into one side of the rotating gear and is fixedly connected to it, and both ends of the brake disc are fixedly connected to the antenna back frame.

2. The ultra-large aperture radar antenna according to claim 1, characterized in that: The antenna unit is installed on the front of the antenna frame, and the back of the antenna frame is fixedly connected to a pair of antenna back frames. The antenna frame is fixedly connected by arranging and combining multiple sub-frames to form a first transverse connection point and a second transverse connection point.

3. The ultra-large aperture radar antenna according to claim 2, characterized in that: A pair of antenna back frames include a first antenna back frame and a second antenna back frame, the first antenna back frame is located at the first transverse connection, the second antenna back frame is located at the second transverse connection, and one side of the first antenna back frame and the second antenna back frame is fixedly connected to the antenna frame.

4. The ultra-large aperture radar antenna according to claim 3, characterized in that: A pair of arms includes a first arm and a second arm, the first arm is fixedly connected to the first antenna back frame, and the second arm is fixedly connected to the second antenna back frame, the first antenna back frame and the second antenna back frame are located between the first arm and the second arm, and the first antenna back frame and the second antenna back frame rotate with the pair of arms as a fulcrum.

5. The ultra-large aperture radar antenna according to claim 1, characterized in that: Each of the arms includes a base, a first upward-looking sub-arm, a second upward-looking sub-arm, a third upward-looking sub-arm and a fourth upward-looking sub-arm, one end face of the base is fixedly connected to the ground, the first upward-looking sub-arm, the second upward-looking sub-arm, the third upward-looking sub-arm and the fourth upward-looking sub-arm are fixedly connected to the other side face of the base in sequence, and from a downward-looking angle, the planar length of the base is greater than the planar length of the first to fourth upward-looking sub-arms and each upward-looking sub-arm, and the planar width of the base is the same as the planar width of the first upward-looking sub-arm and the second upward-looking sub-arm.

6. The ultra-large aperture radar antenna according to claim 4, characterized in that: A pair of rotating gears includes a first rotating gear and a second rotating gear, the first rotating gear is fixedly connected to the other side of the first antenna back frame, and the second rotating gear is fixedly connected to the other side of the second antenna back frame, and each of the rotating gears is composed of multiple pairs of gear ring segments and spokes, and the meshing teeth on the gear ring are located on the outer ring of the gear ring.

7. The ultra-large aperture radar antenna according to claim 1, characterized in that: Each of the sub-drive devices includes a drive motor, a reducer, a coupling, a meshing gear and a mounting support. Each of the sub-drive devices is fixedly connected to the truss through the mounting support. The reducer is fixedly connected to the output shaft of the drive motor. The reducer is fixedly connected to the meshing gear through the coupling, and the meshing gear is meshed with the teeth of the rotating gear.

8. The ultra-large aperture radar antenna according to claim 7, characterized in that: The braking device is located on one side close to the pair of pitch arms. Under normal circumstances, the braking device brakes the rotating gear. When the pitch angle of the antenna frame needs to be adjusted, the braking device releases the rotating gear, and drives the antenna back frame through the rotating gear to adjust the pitch angle of the antenna frame.

9. The method for rotating the pitch angle of a very large aperture radar antenna according to claim 8, characterized in that: The braking device releases the rotating gear, and the driving motor drives the meshing gear to engage with the rotating gear, driving the rotating gear to rotate in the pitch direction. The rotating gear drives the antenna frame to rotate in the pitch direction through the antenna back frame. When the antenna frame rotates to the required pitch angle, the driving motor stops driving the meshing gear, and then brakes the rotating gear with the braking device to lock the pitch rotation of the antenna frame.

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