A large parabolic cylindrical antenna ground deployment test device

Abstract

The application discloses a large parabolic cylindrical antenna ground unfolding test equipment, which is used for gravity unloading when a parabolic cylindrical antenna unfolding structure is unfolded in two directions of circular arc and straight line, and comprises a supporting frame, an unfolding following assembly and a plurality of hoisting assemblies, wherein the unfolding following assembly is installed on the supporting frame, the upper end of the hoisting assembly is in driving connection with the unfolding following assembly, and the lower end of the hoisting assembly is connected with the parabolic cylindrical antenna unfolding structure; when the parabolic cylindrical antenna unfolding structure is unfolded, the lower end of the hoisting assembly is moved, and when the lower end of the hoisting assembly is moved, the unfolding following assembly drives the upper end of the hoisting assembly to move, so that the hoisting assembly is adjusted in real time and arranged along the radial direction of the circular arc surface of the parabolic cylindrical antenna unfolding structure.

Description

Technical Field

[0001] This invention belongs to the field of space antenna technology, and in particular relates to a ground deployment test device for a large parabolic cylindrical antenna. Background Technology

[0002] To meet the ever-growing needs of the aerospace industry, space antennas are developing towards larger size and higher precision. The success or failure of on-orbit antenna deployment directly determines the success or failure of the entire satellite mission. Therefore, ground reliability testing of antenna deployment is a crucial part of the antenna development process. Ground reliability testing of antenna deployment requires the development of ground deployment test equipment to simulate the zero-gravity environment of the antenna in orbit.

[0003] Parabolic cylindrical antennas have advantages such as high gain, strong directivity, and easy beam scanning, playing an irreplaceable role in fields such as rain radar and Earth observation. They are one of the important development directions in the antenna field in recent years. However, large-scale high-precision parabolic cylindrical antennas have placed higher demands on the gravity unloading accuracy of ground-deployed experiments.

[0004] Large parabolic cylindrical antennas, such as the parabolic cylindrical antenna disclosed in Chinese patent CN114256604A, have all antenna components that unfold synchronously. The antenna unfolding support structure realizes the antenna unfolding function and the structural support and retention function after unfolding. The front and rear surfaces of the antenna unfolding support structure are concentric arc surfaces. The antenna unfolding process is a variable cell motion, and the gravity distribution in the unloading area is a dynamic process.

[0005] Existing ground deployment test equipment, such as the parabolic cylindrical antenna deployment reflector ground test equipment disclosed in Chinese patent CN109540198A, although it adopts a suspension device and an active following control system, can unload the gravity during the deployment process relatively well. However, it cannot meet the requirements for precise unloading of the dynamic changes in gravity during the antenna variable cell deployment process. In addition, the counterweight of the suspension device has inconsistent frictional force direction during the up and down floating process, which causes deviation in gravity unloading and cannot meet the requirements for high-precision gravity unloading. Summary of the Invention

[0006] To address the problems in the background art, the purpose of this invention is to provide a ground deployment test device for a large parabolic cylindrical antenna, used for gravity unloading when the parabolic cylindrical antenna deployment structure is deployed in both circular and straight directions. The device includes a support frame, a deployment following assembly, and several hoisting assemblies. The deployment following assembly is mounted on the support frame, and the upper end of the hoisting assembly is drivenly connected to the deployment following assembly, while the lower end is connected to the parabolic cylindrical antenna deployment structure.

[0007] When the parabolic cylindrical antenna deployment structure is deployed, it causes the lower end of the hoisting assembly to move. When the lower end of the hoisting assembly moves, the deployment following assembly causes the upper end of the hoisting assembly to move, so as to adjust the hoisting assembly in real time so that it is set radially along the arc surface of the parabolic cylindrical antenna deployment structure.

[0008] Preferably, the deployment and following assembly includes an active deployment and following assembly and a passive deployment and following assembly. The active deployment and following assembly is connected to the support frame and is arranged along the concentric arc direction of the deployment of the parabolic cylindrical antenna deployment structure.

[0009] The driven deployment and following component is driven to be connected to the active deployment and following component and is arranged along the straight line direction of the deployment of the parabolic cylindrical antenna deployment structure. The upper end of the hoisting component is slidably connected to the driven deployment and following component.

[0010] When the parabolic cylindrical antenna deployment structure is deployed, it drives the lower end of the hoisting assembly to move, so that the upper end of the hoisting assembly slides on the driven deployment following assembly along the straight line direction of the deployment of the parabolic cylindrical antenna deployment structure; the active deployment following assembly drives the driven deployment following assembly to drive the upper end of the hoisting assembly to move along the concentric arc direction of the deployment of the parabolic cylindrical antenna deployment structure.

[0011] Preferably, the active deployment and following component includes several suspensions arranged sequentially along the straight line direction of the deployment of the parabolic cylindrical antenna deployment structure. The upper end of each suspension is connected to the support frame, and the lower end is provided with an arc-shaped guide rail. The central axis of the arc-shaped guide rail coincides with the central axis of the arc surface of the parabolic cylindrical antenna deployment structure. At least one of the suspensions has several driving devices that can move along the arc-shaped guide rail on its arc-shaped guide rail, and the other suspensions have several sliding devices that can slide along the arc-shaped guide rail on their arc-shaped guide rails.

[0012] The driven deployment and following assembly includes several linear guide rails arranged sequentially along the concentric arc direction of the parabolic cylindrical antenna deployment structure. The linear guide rails are arranged along the straight direction of the parabolic cylindrical antenna deployment structure and are located below the arc guide rails. The upper end of the hoisting assembly is slidably connected to the linear guide rails.

[0013] The number of driving devices or sliding devices on each of the arc guide rails is the same as the number of linear guide rails, and each driving device or sliding device on each of the arc guide rails is connected to each of the linear guide rails.

[0014] Preferably, the hoisting assembly includes hoisting ropes, and a plurality of the hoisting ropes are slidably connected to each of the linear guide rails.

[0015] Preferably, the linear guide rail includes an angle measuring device, with at least one such angle measuring device on each of the linear guide rails. The relative positions of the linear guide rails with respect to the driving device and the sliding device are fixed. The angle measuring device is used to detect the real-time angle of the suspension rope on the linear guide rail.

[0016] Preferably, the hoisting assembly includes a spring-loaded buffer rod, which is connected in series with the hoisting rope.

[0017] Preferably, the driving device includes an arc-shaped trolley, a transmission gear and a drive motor, and the lower end face of the arc-shaped guide rail is provided with an arc-shaped rack;

[0018] The circular arc trolley is hollow, and the circular arc guide rail is disposed inside the circular arc trolley. The upper end face of the circular arc trolley is slidably connected to the upper end face of the circular arc guide rail. The transmission gear is disposed inside the circular arc trolley and located below the circular arc guide rail. The transmission gear meshes with the arc-shaped rack. The drive motor is disposed on one side of the circular arc trolley, and its output shaft is connected to the transmission gear.

[0019] The sliding device is the circular arc trolley.

[0020] Preferably, the device includes a connecting rod, the two ends of which are fixedly connected to the arc trolley and the linear guide rail, respectively, and the relative position and angle between the connecting rod and the arc trolley and the linear guide rail remain unchanged.

[0021] Preferably, the suspension includes a horizontal bar and a plurality of vertical bars, the horizontal bar being connected to the support frame, the plurality of vertical bars being arranged sequentially along the length direction of the horizontal bar, and the vertical bars connecting the horizontal bar and the arc guide rail.

[0022] Preferably, the radius of the arc guide rail is less than or equal to one-third of the radius of the arc surface of the parabolic cylindrical antenna unfolding structure.

[0023] Because the present invention adopts the above technical solution, it has the following advantages and positive effects compared with the prior art:

[0024] 1. This invention uses a follow-up deployment component to move the upper end of the hoisting component as the lower end moves, thereby adjusting the hoisting component in real time to align it radially along the arc surface of the parabolic cylindrical antenna deployment structure. By adjusting the hoisting component in real time along the arc surface of the parabolic cylindrical antenna deployment structure, the hoisting component achieves a fixed-length design. In other words, the hoisting component can provide reliable gravity unloading for the parabolic cylindrical antenna deployment structure during variable cell deployment while maintaining a constant length. This ensures that the movement trajectory of the arc surface of the parabolic cylindrical antenna deployment structure is its own arc surface. Compared to traditional variable-length hoisting components, this results in higher hoisting accuracy because the up-and-down floating of the counterweight unloading in traditional hoisting components introduces friction, which affects the unloading accuracy.

[0025] 2. Because the angle measuring device of the present invention is mounted on a linear guide rail, and the relative position of the linear guide rail and the driving device is fixed, the relative position and angle of the driving device and the angle measuring device remain constant. During operation, the angle measuring device detects the angle of the suspension rope in real time. The initial angle value detected by the angle measuring device is the value when the suspension rope is located radially on the arc surface of the parabolic cylindrical antenna unfolding structure. When the parabolic cylindrical antenna unfolding structure expands, causing the suspension rope to move and its angle to change, the angle measuring device can detect this in real time and then feed it back to the driving device. The driving device moves on the arc track to drive the linear guide rail and the angle measuring device to move in an arc, and simultaneously drives the upper end of the suspension rope to move until the angle value detected by the angle measuring device is returned to the initial value, so that the suspension rope is once again located radially on the arc surface of the parabolic cylindrical antenna unfolding structure. This achieves delayed active following closed-loop control, ensuring that the suspension rope is always located radially on the arc surface of the parabolic cylindrical antenna unfolding structure. In the straight direction, the suspension rope can be driven by the force of the parabolic cylindrical antenna deployment structure to slide along the linear guide rail to achieve position adjustment in the straight direction. By actively following in the arc direction and following in the straight direction, the high-precision gravity unloading of the parabolic cylindrical antenna deployment structure is achieved during the deployment process, which is beneficial for evaluating the on-orbit deployment capability of large parabolic cylindrical antennas.

[0026] 3. The present invention greatly reduces the height requirements of the factory space by combining the design of circular arc guide rail and linear guide rail. Otherwise, if the central axis of the circular arc surface of the parabolic cylindrical antenna deployment structure is used as the installation axis of the suspension rope, the length of the suspension rope will be too long, which puts forward higher requirements on the height of the factory where the deployment test equipment is placed.

[0027] 4. The hoisting assembly of this invention is equipped with a spring buffer rod, which can adapt to the slight fluctuation of the unloading point caused by the variable cell movement of the parabolic cylindrical antenna deployment structure, dynamically compensate for the change in unloading force during the variable cell deployment process, and more accurately unload the gravity during the deployment process. Attached Figure Description

[0028] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0029] Figure 1 This is a schematic diagram of the overall invention;

[0030] Figure 2 This is a partial schematic diagram of the unfolded structure of the support frame and parabolic cylindrical antenna of the present invention;

[0031] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0032] Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0033] Figure 5 This is a schematic diagram of the hoisting assembly of the present invention;

[0034] Figure 6 This is a schematic diagram of the invention.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Support frame; 2. Deployment and following assembly; 21. Horizontal rod; 22. Vertical rod; 23. Circular arc guide rail; 24. Circular arc trolley; 25. Connecting rod; 26. Linear guide rail; 27. Linear trolley; 28. Angle measuring device; 29. ​​Drive device; 291. Drive motor; 292. Transmission gear; 293. Arc rack; 3. Lifting assembly; 31. Lifting rope; 32. Spring buffer rod; 4. Parabolic cylindrical antenna deployment structure. Detailed Implementation

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise ratios, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0038] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0039] See Figures 1 to 6 The core of this invention is to provide a ground deployment test device for a large parabolic cylindrical antenna, which is used for gravity unloading when the parabolic cylindrical antenna deployment structure 4 is deployed in both circular arc and straight line directions. The upper and lower surfaces of the deployment structure of the parabolic cylindrical antenna are designed to be circular arc-shaped, and the cable net reflector is stretched into a parabolic surface in the deployment structure.

[0040] The ground deployment test equipment for a large parabolic cylindrical antenna includes a support frame 1, a deployment follower assembly 2, and several hoisting assemblies 3. The support frame 1 is a truss structure. The deployment follower assembly 2 is installed on the support frame 1. The upper end of the hoisting assembly 3 is driven to the deployment follower assembly 2, and the lower end is connected to the parabolic cylindrical antenna deployment structure 4.

[0041] When the parabolic cylindrical antenna deployment structure 4 is deployed, it drives the lower end of the hoisting assembly 3 to move. When the deployment follower assembly 2 moves at the lower end of the hoisting assembly 3, it drives the upper end of the hoisting assembly 3 to move, so as to adjust the hoisting assembly 3 in real time so that it is set radially along the arc surface of the parabolic cylindrical antenna deployment structure 4.

[0042] By deploying the following component 2 and moving it along the lower end of the hoisting component 3, the upper end of the hoisting component 3 is moved, thereby adjusting the hoisting component 3 in real time so that it is set radially along the arc surface of the parabolic cylindrical antenna deployment structure 4. By deploying the following component 2 and adjusting the hoisting component 3 in real time to be radially along the arc surface of the parabolic cylindrical antenna deployment structure 4, the hoisting component 3 achieves a fixed length design. In other words, the hoisting component 3 can provide reliable gravity unloading for the parabolic cylindrical antenna deployment structure 4 when the structure is deployed with a constant length. This ensures that the movement trajectory of the arc surface of the parabolic cylindrical antenna deployment structure 4 is its own arc surface. Compared with the traditional variable-length hoisting component 3, this results in higher hoisting accuracy because the friction introduced by the up-and-down floating of the counterweight unloading of the traditional hoisting component 3 affects the unloading accuracy.

[0043] The deployment follower assembly 2 includes an active deployment follower assembly and a passive deployment follower assembly. The active deployment follower assembly is connected to the support frame 1 and is arranged along the concentric arc direction of the parabolic cylindrical antenna deployment structure 4. The passive deployment follower assembly is driven to connect with the active deployment follower assembly and is arranged along the straight line direction of the parabolic cylindrical antenna deployment structure 4. The upper end of the hoisting assembly 3 is slidably connected to the passive deployment follower assembly.

[0044] When the parabolic cylindrical antenna deployment structure 4 is deployed, it drives the lower end of the hoisting assembly 3 to move, so that the upper end of the hoisting assembly 3 slides on the driven deployment follower assembly along the straight line direction of the deployment of the parabolic cylindrical antenna deployment structure 4; the active deployment follower assembly drives the driven deployment follower assembly to drive the upper end of the hoisting assembly 3 to move along the concentric arc direction of the deployment of the parabolic cylindrical antenna deployment structure 4.

[0045] Specifically, the active deployment and following assembly includes several suspensions arranged sequentially along the straight line of the parabolic cylindrical antenna deployment structure 4. Each suspension includes a horizontal rod 21, an arc-shaped guide rail 23, and several vertical rods 22. The horizontal rod 21 is located at the upper end and connected to the support frame 1, the arc-shaped guide rail 23 is located at the lower end, and the vertical rods 22 are arranged sequentially along the length of the horizontal rod 21, connecting the horizontal rod 21 and the arc-shaped guide rail 23. The central axis of the arc-shaped guide rail 23 coincides with the central axis of the arc surface of the parabolic cylindrical antenna deployment structure 4.

[0046] At least one of the suspensions has a number of drive devices 29 on the arc guide rail 23 that can move actively along the arc guide rail 23, and the other suspensions have a number of sliding devices on the arc guide rail 23 that can slide along the arc guide rail 23.

[0047] The driven unfolding follower assembly includes several linear guide rails 26 arranged sequentially along the concentric arc direction of the parabolic cylindrical antenna unfolding structure 4. The linear guide rails 26 are arranged along the straight line direction of the unfolding of the parabolic cylindrical antenna unfolding structure 4, and the linear guide rails 26 are located below the arc guide rails 23. The upper end of the hoisting assembly 3 is slidably connected to the linear guide rails 26 through a linear trolley 27.

[0048] The number of drive devices 29 or sliding devices on each arc guide rail 23 is the same as the number of linear guide rails 26, and each drive device 29 or sliding device on each arc guide rail 23 is connected to each linear guide rail 26.

[0049] The drive device 29 is used to drive the linear guide rail 26, the linear trolley 27 and the upper end of the hoisting assembly 3 to move along the arc guide rail 23. The number of drive devices 29 and sliding devices is not limited here. Each suspension can be equipped with a drive device 29, or a drive device 29 can be installed on individual suspensions and the rest can be equipped with sliding devices. Alternatively, one drive device 29 can be installed on one suspension and the rest can be equipped with sliding devices. As long as it can drive the linear guide rail 26 to move in an arc, each linear guide rail 26 can be connected to at least one drive device 29.

[0050] The hoisting assembly 3 includes hoisting ropes 31 and spring-loaded buffer rods 32. Several hoisting ropes 31 are slidably connected to each linear guide rail 26 via linear trolleys 27. The spring-loaded buffer rods 32 are connected in series with the hoisting ropes 31. The spring-loaded buffer rods 32 are used to control parameters such as the unloading force at the unloading point and the length of the hoisting ropes 31. During the product deployment test, the spring-loaded buffer rods 32 can accommodate the slight fluctuations in the unloading point caused by the variable cell movement of the parabolic cylindrical antenna deployment structure 4, dynamically compensating for changes in the unloading force during the variable cell deployment process, and more accurately unloading the gravity during deployment. The value of each spring-loaded buffer rod 32 is adjusted according to the gravity distribution value of the product at the unloading point. The spring-loaded buffer rods 32 have the ability to compensate for dynamic changes in the gravity at the unloading point of the parabolic cylindrical antenna deployment device during the variable cell deployment process, ranging from 1% to 5%.

[0051] By combining the design of the arc guide rail 23 and the linear guide rail 26, the height requirement of the factory space is greatly reduced. Otherwise, if the central axis of the arc surface of the parabolic cylindrical antenna deployment structure 4 is used as the installation axis of the suspension rope 31, the length of the suspension rope 31 would be too long, which would place higher requirements on the height of the factory where the deployment test equipment is placed.

[0052] For details, please refer to Figure 4 The driving device 29 includes an arc-shaped trolley 24, a transmission gear 292, and a drive motor 291. An arc-shaped rack 293 is provided on the lower end face of the arc-shaped guide rail 23. The arc-shaped trolley 24 is hollow, and the arc-shaped guide rail 23 is disposed inside the arc-shaped trolley 24. The upper end face inside the arc-shaped trolley 24 is slidably connected to the upper end face of the arc-shaped guide rail 23. The transmission gear 292 is disposed inside the arc-shaped trolley 24 and located below the arc-shaped guide rail 23. The transmission gear 292 meshes with the arc-shaped rack 293. The drive motor 291 is disposed on one side of the arc-shaped trolley 24, and its output shaft is connected to the transmission gear 292 via a spline. (See reference...) Figure 3 The sliding device is an arc-shaped trolley 24. By setting the sliding device as an arc-shaped trolley 24, it serves the purpose of sliding connection with the arc-shaped guide rail 23 on the one hand, and achieves the purpose of commonality of parts with the drive device 29 on the other hand, which greatly reduces manufacturing and maintenance costs.

[0053] It also includes a rigid connecting rod 25, with its two ends fixedly connected to the arc trolley 24 and the linear guide rail 26, respectively. The relative position and angle between the connecting rod 25 and the arc trolley 24 and the linear guide rail 26 remain unchanged. In other words, the connecting rod 25 moves in an arc along with the arc trolley 24, the linear trolley 27 and the linear guide rail 26.

[0054] Preferably, the length of the connecting rod 25 connecting each suspension to the linear guide rail 26 can be set to different lengths, so that the linear guide rails 26 can be staggered when they converge in the arc direction to prevent geometric interference. At this time, the length of each suspension rope 31 is adaptively adjusted so that its total length with the connecting rod 25 remains unchanged. In this embodiment, the connecting rods 25 in each suspension are alternately set to two different lengths to realize the double-layer design of the linear guide rail 26.

[0055] It also includes an angle measuring device 28, with at least one angle measuring device 28 on each linear guide rail 26. The relative position of the linear guide rail 26 and the circular arc trolley 24 is fixed. The angle measuring device 28 is used to detect the real-time angle of the suspension rope 31 on the linear guide rail 26. Specifically, the angle measuring device 28 is set on the linear trolley 27 and is connected to the suspension rope 31 through a measuring rod to detect the angle change of the suspension rope 31.

[0056] In this embodiment, several sets of hoisting components 3 are provided, and these sets of hoisting components 3 are arranged sequentially along the length direction of the linear guide rail 26. The number of hoisting components 3 in each set is the same as the number of linear guide rails 26. One set of hoisting components 3 is located at the center of the parabolic cylindrical antenna deployment structure 4 in the straight direction. Each hoisting component 3 at the center is equipped with an angle measuring device 28 on a linear trolley 27. Since the hoisting component 3 at the center will not slide on the linear guide rail when the parabolic cylindrical antenna deployment structure 4 is deployed, the influence of the linear sliding of the hoisting component 3 on the measurement of the angle measuring device 28 can be eliminated, resulting in higher measurement accuracy.

[0057] In this embodiment, the radius of the circular arc guide rail 23 is less than or equal to one-third of the radius of the circular arc surface of the parabolic cylindrical antenna deployment structure 4. See also... Figure 6 Based on the radius R of the arc surface of the parabolic cylindrical antenna deployment structure 4, the radius R' of the arc guide rail 23 is preferred. For large parabolic cylindrical antennas with an aperture ≥ 10m, the focal length F of the reflector is generally ≥ 5m, and the corresponding arc surface radius R ≥ 16m. Considering the height of the product and the multi-layer design of the top layer of the support frame 1, if the central axis OO' of the arc surface of the parabolic cylindrical antenna deployment structure 4 is used as the installation axis for suspension, this places a requirement of 22m or higher on the height of the equipment in the factory building. The design of the arc guide rail 23 can effectively reduce the height requirement of the equipment in the factory building. The general design principle of the arc radius R' is: R' ≤ R / 3, so that the length of the suspension rope 31 is as long as possible to reduce the stiffness change of the suspension rope 31 during deployment, improve the gravity unloading accuracy during deployment, and the longer the suspension rope 31, the smaller its horizontal component force, which allows it to be much closer to the space environment.

[0058] Because the angle measuring device 28 of the present invention is mounted on the linear guide rail 26, and the relative position of the linear guide rail 26 and the driving device 29 is fixed, the relative position and angle of the driving device 29 and the angle measuring device 28 remain constant. During operation, the angle measuring device 28 detects the angle of the suspension rope 31 in real time. The initial angle value detected by the angle measuring device 28 is the value when the suspension rope 31 is located radially on the arc surface of the parabolic cylindrical antenna deployment structure 4. When the parabolic cylindrical antenna deployment structure 4 expands and causes the suspension rope 31 to move, changing its angle, the angle measuring device 28 can detect this in real time and then feed it back to the driving device 29. The driving device 29 moves on the arc track to drive the linear guide rail 26 and the angle measuring device 28 to move in an arc, and simultaneously drives the upper end of the suspension rope 31 to move until the angle value detected by the angle measuring device 28 is the initial value, so that the suspension rope 31 is again located radially on the arc surface of the parabolic cylindrical antenna deployment structure 4. This achieves delayed active following closed-loop control, ensuring that the suspension rope 31 is always located radially on the arc surface of the parabolic cylindrical antenna deployment structure 4. In the straight direction, the suspension rope 31 can be driven by the force of the parabolic cylindrical antenna deployment structure 4 to slide on the linear guide rail 26 to achieve position adjustment in the straight direction. By actively following in the arc direction and following in the straight direction, the high-precision gravity unloading of the parabolic cylindrical antenna deployment structure 4 during deployment is achieved, which is beneficial for evaluating the on-orbit deployment capability of large parabolic cylindrical antennas.

[0059] The working process of this invention will be further explained below:

[0060] When the parabolic cylindrical antenna deployment structure 4 is deployed, it drives the lower end of the suspension rope 31 to move. In the straight direction, the movement of the lower end of the suspension rope 31 causes its upper end to slide on the linear guide rail 26. In the arc direction, after the lower end of the suspension rope 31 moves, the angle measuring device 28 detects the change in the angle of the suspension rope 31 in real time and then feeds it back to the drive device 29. When the measured change in angle is greater than the set condition for starting angle adjustment, the drive motor 291 starts and drives the transmission gear 292 to mesh with the arc rack 293, so that the arc trolley 24 moves on the arc guide rail 23 to drive the linear guide rail 26 and the upper end of the suspension rope 31 to move in an arc, compensating for the deviation of the angle of the suspension rope 31, until the angle measured by the angle measuring device 28 is the initial value. The starting angle adjustment angle α can be approximately calculated based on the required unloading point movement position deviation d: α = d / (R-R') / pi × 180°, where d is the unloading point movement position deviation and pi is pi. For large deployable antennas where d is generally required to be within 100mm, the corresponding α value is within 0.5°.

[0061] Then, with the real-time measurement of the unfolding angle by the parabolic cylindrical antenna unfolding structure 4 by the measuring device 28 and the real-time adjustment by the driving device 29, the lag-driven active following closed-loop control in the arc direction and the follow-up in the linear direction are realized, so as to realize the unfolding motion trajectory tracking of the parabolic cylindrical antenna unfolding structure 4.

[0062] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. A ground-based deployment test apparatus for a large parabolic cylindrical antenna, used for gravity unloading during the variable-cell deployment of the parabolic cylindrical antenna structure in both circular and linear directions, characterized in that... It includes a support frame, a deployment and following assembly, and several hoisting assemblies. The deployment and following assembly is mounted on the support frame. The upper end of the hoisting assembly is driven to the deployment and following assembly, and the lower end is connected to the deployment structure of the parabolic cylindrical antenna. When the parabolic cylindrical antenna deployment structure is deployed, it drives the lower end of the hoisting assembly to move. When the lower end of the hoisting assembly moves, the deployment following assembly drives the upper end of the hoisting assembly to move, so as to adjust the hoisting assembly in real time so that it is set radially along the arc surface of the parabolic cylindrical antenna deployment structure. The deployment and following assembly includes an active deployment and following assembly and a passive deployment and following assembly. The active deployment and following assembly is connected to the support frame and is arranged along the concentric arc direction of the deployment structure of the parabolic cylindrical antenna. The driven deployment and following component is driven to be connected to the active deployment and following component and is arranged along the straight line direction of the deployment of the parabolic cylindrical antenna deployment structure. The upper end of the hoisting component is slidably connected to the driven deployment and following component. When the parabolic cylindrical antenna deployment structure is deployed, it drives the lower end of the hoisting assembly to move, so that the upper end of the hoisting assembly slides on the driven deployment following assembly along the straight line direction of the deployment of the parabolic cylindrical antenna deployment structure; the active deployment following assembly drives the driven deployment following assembly to drive the upper end of the hoisting assembly to move along the concentric arc direction of the deployment of the parabolic cylindrical antenna deployment structure. The active deployment and following component includes several suspensions arranged sequentially along the straight line direction of the deployment of the parabolic cylindrical antenna deployment structure. The upper end of each suspension is connected to the support frame, and the lower end is provided with an arc-shaped guide rail. The central axis of the arc-shaped guide rail coincides with the central axis of the arc surface of the parabolic cylindrical antenna deployment structure. At least one of the suspensions has several driving devices that can move along the arc-shaped guide rail on its arc-shaped guide rail, and the other suspensions have several sliding devices that can slide along the arc-shaped guide rail on their arc-shaped guide rails. The driven deployment and following assembly includes several linear guide rails arranged sequentially along the concentric arc direction of the parabolic cylindrical antenna deployment structure. The linear guide rails are arranged along the straight direction of the parabolic cylindrical antenna deployment structure and are located below the arc guide rails. The upper end of the hoisting assembly is slidably connected to the linear guide rails. The number of driving devices or sliding devices on each of the arc guide rails is the same as the number of linear guide rails, and each driving device or sliding device on each arc guide rail is connected to each of the linear guide rails respectively. Each of the linear guides is provided with at least one angle measuring device. The relative positions of the linear guides, the drive device, and the sliding device are fixed. The angle measuring device is used to detect the real-time angle of the hoisting components on the linear guides.

2. The ground deployment test equipment for a large parabolic cylindrical antenna according to claim 1, characterized in that, The hoisting assembly includes hoisting ropes, and several hoisting ropes are slidably connected to each of the linear guide rails.

3. The ground deployment test equipment for a large parabolic cylindrical antenna according to claim 2, characterized in that, The hoisting assembly includes a spring-loaded buffer rod, which is connected in series with the hoisting rope.

4. The ground deployment test equipment for a large parabolic cylindrical antenna according to claim 1, characterized in that, The driving device includes an arc-shaped trolley, a transmission gear, and a drive motor, and the lower end face of the arc-shaped guide rail is provided with an arc-shaped rack. The circular arc trolley is hollow, and the circular arc guide rail is disposed inside the circular arc trolley. The upper end face of the circular arc trolley is slidably connected to the upper end face of the circular arc guide rail. The transmission gear is disposed inside the circular arc trolley and located below the circular arc guide rail. The transmission gear meshes with the arc-shaped rack. The drive motor is disposed on one side of the circular arc trolley, and its output shaft is connected to the transmission gear. The sliding device is the circular arc trolley.

5. The ground deployment test equipment for a large parabolic cylindrical antenna according to claim 4, characterized in that, It includes a connecting rod, the two ends of which are fixedly connected to the arc trolley and the linear guide rail respectively, and the relative position and angle of the connecting rod with the arc trolley and the linear guide rail remain unchanged.

6. The ground deployment test equipment for a large parabolic cylindrical antenna according to claim 1, characterized in that, The suspension includes a horizontal bar and several vertical bars. The horizontal bar is connected to the support frame. The several vertical bars are arranged sequentially along the length of the horizontal bar, and the vertical bars connect the horizontal bar and the arc guide rail.

7. The ground deployment test equipment for a large parabolic cylindrical antenna according to claim 1, characterized in that, The radius of the circular arc guide rail is less than or equal to one-third of the radius of the circular arc surface of the parabolic cylindrical antenna unfolding structure.

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