A stress-free assembly monitoring system and method for a large-size solid surface antenna reflector

Abstract

The application discloses a large-size solid surface antenna reflecting surface stress-free assembly monitoring system and method, which comprises a solid surface antenna, a support and adjustment system for supporting, fixing and adjusting the profile accuracy and geometric accuracy of the solid surface antenna, and a deformation measurement and monitoring system for non-contact real-time measurement and monitoring of the profile accuracy and deformation condition of the antenna during the assembly and adjustment process. The support and adjustment system comprises an auxiliary support structure for establishing an initial support state of the antenna reflecting surface, and a main support structure for adjusting the profile accuracy and geometric accuracy of the solid surface antenna. The deformation measurement and monitoring system comprises a photogrammetry system for non-contact measurement of the antenna profile accuracy, a movable mechanical arm, and at least one laser displacement sensor installed on the movable mechanical arm for real-time monitoring of the antenna deformation condition caused by assembly stress. The application combines the antenna reflecting surface adjustment, profile accuracy measurement and assembly stress monitoring system, can realize real-time monitoring of the profile accuracy change of the antenna, improves the assembly efficiency and eliminates the assembly stress.

Description

Technical Field

[0001] This invention relates to the field of high-precision integrated assembly technology for spaceborne payload antennas, and particularly to a stress-free assembly monitoring system and method for large-size solid-surface antenna reflectors. Background Technology

[0002] Antenna reflectors are a crucial component of satellite payloads, and their performance directly impacts payload performance. Domestic and international aerospace organizations have conducted extensive research and exploration in the fields of large antennas and high-precision antenna reflectors.

[0003] The main advantage of solid-surface antennas is their high precision, enabling them to achieve very high manufacturing accuracy and making them irreplaceable. However, during the later stages of integration, assembly, and debugging of the antenna reflector, errors are often introduced due to assembly stress, gravity, and other factors, affecting the initial manufacturing accuracy of the antenna reflector. Therefore, during ground production, integration, assembly, and testing, it is necessary to strictly control the product assembly accuracy, assembly stress, and the impact of gravity deformation to avoid loss of antenna reflector precision due to these issues. Controlling assembly stress and implementing gravity balancing measures are more conducive to stabilizing and maintaining the accuracy of the antenna reflector, preventing changes in accuracy due to differences between ground and on-orbit environments, as well as stress release, which is of great significance for the stability of payload performance.

[0004] Stress-free assembly of aerospace products is a crucial step in ensuring the on-orbit performance of spacecraft. Large-aperture antennas, especially deployable antennas, present significant challenges in achieving high-precision assembly due to their system complexity. Traditional assembly methods often struggle to balance the mutually restrictive engineering requirements of "stress-free" and "high precision," leading to loss of accuracy in the antenna reflector and impacting the stability of on-orbit performance. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention provides a stress-free assembly monitoring system and method for large-size solid-surface antenna reflectors. The system is simple in composition and highly versatile, suitable for adjusting the surface accuracy of a single reflector or the surface and relative positional accuracy of multiple reflectors. It comprehensively utilizes the initial processing accuracy, simulation analysis accuracy, and actual detection accuracy data of the antenna, enabling stress control and stress source tracing. It solves the engineering problem of balancing "stress-free" and "high precision" in traditional methods, and has certain application prospects in the field of high-precision integrated assembly of solid-surface antenna reflectors.

[0006] To achieve the aforementioned objectives of the invention, the technical solution adopted to solve its technical problems is as follows: In a first aspect, the present invention discloses a stress-free assembly monitoring system for a large-size solid-surface antenna reflector, comprising: Solid surface antenna; A support and adjustment system is used to support, fix, and adjust the surface accuracy and positional accuracy of the solid-surface antenna. Deformation measurement and monitoring system is used for non-contact, real-time measurement and monitoring of surface accuracy and deformation during antenna assembly and adjustment; The support and adjustment system includes: Auxiliary support structure, used to establish the initial support state of the antenna reflector; The main support structure is used to adjust the surface accuracy and positional accuracy of the solid-surface antenna. The deformation measurement and monitoring system includes: Photogrammetry system for non-contact measurement of antenna profile accuracy; Mobile robotic arm; At least one laser displacement sensor is mounted on the movable robotic arm to monitor the antenna deformation caused by assembly stress in real time.

[0007] Furthermore, the auxiliary support structure comprises no fewer than three sets, each set including a force sensor and a fixed-length support rod. The force sensor is connected in series with the fixed-length support rod, and one end of the fixed-length support rod is in contact with the solid-plane antenna. The force sensor is used to record the force state of each fixed-length support rod and monitor the force changes during the assembly and adjustment process.

[0008] Furthermore, the main support structure includes several groups, each group including an adjustable strut and a ball joint hinge; one end of the adjustable strut is connected to the antenna reflector base through an adjustable strut mounting foot, and the other end is connected to the fixed antenna through an antenna mounting bracket; the ball joint hinge is disposed between the adjustable strut and the antenna mounting bracket, or between the antenna mounting bracket and the fixed antenna, to release installation stress during antenna installation and adjustment.

[0009] Furthermore, the photogrammetry system includes no fewer than four measuring cameras, which are networked measuring cameras arranged around the fixed antenna. The optical axis of each measuring camera points to the center of the antenna reflector, enabling synchronous triggering and real-time acquisition of the antenna's surface accuracy and error distribution cloud map.

[0010] Furthermore, the movable robotic arm has at least three degrees of freedom, and the laser displacement sensor is mounted on the end effector of the movable robotic arm, which is capable of positioning the laser displacement sensor above each set of main support structures to be assembled.

[0011] Furthermore, the auxiliary support structure and the main support structure are arranged alternately in space. The auxiliary support structure is used to provide temporary support and monitor stress during the assembly process, while the main support structure is used to provide permanent support after the antenna assembly is completed. The auxiliary support structure is removed after the main support structure is fully installed. After removal, the antenna reflector is independently supported by the main support structure, and the surface accuracy of the solid antenna remains unchanged before and after removal.

[0012] Furthermore, the solid surface antenna is a single solid surface antenna or a combination of multiple solid surface antennas spliced ​​together; in the case of multiple solid surface antennas spliced ​​together, the system includes a solid surface antenna and at least one antenna spread lobe. The solid surface antenna first establishes an initial support state through an auxiliary support structure and then installs the main support structure. The antenna spread lobe is then adjusted in terms of shape and position accuracy based on the solid surface antenna.

[0013] Secondly, the present invention also discloses a stress-free assembly monitoring method for a large-size solid-surface antenna reflector, which utilizes the aforementioned stress-free assembly monitoring system for a large-size solid-surface antenna reflector for assembly and monitoring, and includes the following steps: Step S1: Establishing the initial support state The initial support state of the solid surface antenna is established by an auxiliary support structure, and the initial machining accuracy of the solid surface antenna is used as a benchmark. The measured surface accuracy of the solid surface antenna under the initial support state is verified by a photogrammetry system to ensure that it matches the initial machining accuracy. Step S2: Stress-free antenna assembly and precision adjustment While maintaining the initial support state, install the main support structure, and monitor in real time whether assembly stress is introduced during the assembly process using at least one of force sensors, laser displacement sensors and photogrammetry systems. If stress changes are detected, readjust the installation. Step S3: Antenna accuracy retest and confirmation After removing all auxiliary support structures, the surface accuracy of the solid antenna is remeasured using a photogrammetry system. The remeasurement results are then compared with the surface accuracy under the initial support condition. If the two match, the assembly is complete.

[0014] Furthermore, step S1 further includes: S11: Measure the mass and centroid of the solid surface antenna to obtain the initial machining accuracy data of the solid surface antenna; S12: Determine the theoretical support point locations and distribution of the auxiliary support structure through simulation analysis; S13: Install no less than three sets of auxiliary support structures, each set including a force sensor and a fixed-length support rod; S14: Record the readings of each force sensor as the initial reference value; S15: Use a photogrammetry system to detect the surface accuracy of the solid antenna and obtain measured accuracy data; S16: Determine whether the measured accuracy matches the initial machining accuracy. If they do not match, return to step S12 to redetermine the position and distribution of the support points until they match.

[0015] Furthermore, step S2 further includes: S21: Install the laser displacement sensor on the movable robotic arm and place it above the main support structure to be assembled, and record the initial reading of the laser displacement sensor. S22: Install a set of main support structures, adjust the length of the adjustable strut according to the actual situation of the solid surface antenna and the antenna reflector base, and adjust the matching between the antenna mounting bracket and the solid surface antenna mounting structure through the ball joint hinge; S23: During installation, monitor in real time whether the laser displacement sensor readings and / or force sensor readings at the corresponding locations change; S24: If the reading of the laser displacement sensor or the force sensor changes, it is determined that assembly stress has been introduced, and reinstallation or inspection of interface matching is required; if the reading does not change, the main support structure of this group is installed successfully. S25: Repeat steps S22 to S24 until all main support structures are assembled.

[0016] Furthermore, step S3 further includes: S31: After all main support structures are assembled, all auxiliary support structures shall be removed; S32: The surface accuracy of the solid antenna is re-inspected using a photogrammetry system to obtain re-measurement accuracy data and error distribution cloud map; S33: Compare the remeasured accuracy data with the surface accuracy data under the initial support state, and compare the error distribution cloud maps; S34: If the two match, the assembly and adjustment work is completed; if they do not match, return to step S2 to adjust the surface accuracy.

[0017] By employing the above technical solutions, this invention has the following advantages and positive effects compared with the prior art: 1. Controllable stress: By comprehensively utilizing force sensors, laser displacement sensors, and photogrammetric data, the assembly stress is evaluated from three dimensions: force, displacement, and surface profile, enabling comprehensive monitoring of the assembly process and precise location and traceability of stress problems.

[0018] 2. Precision maintenance: The initial support state is established based on the initial machining accuracy, and real-time feedback is provided through the photogrammetry system to ensure that the final assembly accuracy is highly consistent with the design accuracy, thus solving the engineering problem of the difficulty in balancing "stress-free" and "high precision".

[0019] 3. Real-time monitoring: Using a non-contact real-time photogrammetry system and laser displacement sensor, it can monitor the surface accuracy and deformation during the assembly process in real time, and promptly detect and eliminate assembly stress.

[0020] 4. High versatility: It is suitable for splicing and assembling single and multiple solid surface antennas, and is not limited by the size and shape of the antenna, thus having strong engineering adaptability.

[0021] 5. Easy to operate: The system has a simple composition and a clear process, making it suitable for mass production and assembly of aerospace products. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 This is a schematic diagram of the main / auxiliary support structure of the antenna reflector according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the antenna reflector stress-free assembly monitoring system according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the stress-free assembly monitoring system for multi-panel spliced ​​antenna reflectors according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the stress-free assembly process of the antenna reflector according to an embodiment of the present invention.

[0023] [Explanation of Key Symbols] 1 - Solid surface antenna; 1A / 1B - Antenna spread lobe; 2-Auxiliary support structure; 3-Force sensor; 4- Fixed-length support rod; 5-Main support structure; 6- Adjustable struts; 7-Ball joint hinge; 8-Antenna mounting bracket; 9-Adjustable strut mounting feet; 10-Photogrammetric System; 11-Mobile robotic arm; 12-Laser displacement sensor; 13-Antenna reflector base. Detailed Implementation

[0024] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] Example 1 like Figure 1-3 As shown, this invention discloses a stress-free assembly monitoring system for a large-size solid-surface antenna reflector, comprising: The fixed surface antenna 1 is a product to be assembled and adjusted. It can be a single fixed surface antenna 1 or a combination of multiple fixed surface antennas 1 spliced ​​together, and is not limited by the size and shape of the antenna. In this embodiment, the fixed surface antenna 1 is a spaceborne large-aperture high-precision fixed surface antenna, and its aperture is not limited.

[0028] A support and adjustment system is used to support, fix, and adjust the surface accuracy and positional accuracy of the solid-surface antenna 1. Deformation measurement and monitoring system is used for non-contact, real-time measurement and monitoring of surface accuracy and deformation during antenna assembly and adjustment; The support and adjustment system includes: Auxiliary support structure 2 is used to establish the initial support state of the antenna reflector. Its specific support position is determined by a combination of theoretical simulation analysis and surface accuracy measurement of the antenna reflector. The main support structure 5 is used to adjust the surface accuracy and positional accuracy of the solid surface antenna 1. The deformation measurement and monitoring system includes: Photogrammetric system 10 is used for non-contact measurement of antenna profile accuracy; Mobile robotic arm 11; At least one laser displacement sensor 12 is mounted on the movable robotic arm 11 for real-time monitoring of antenna deformation caused by assembly stress.

[0029] Figure 1 and 2 In the process, the auxiliary support structure 2 is not less than three sets, each set including a force sensor 3 and a fixed-length support rod 4. The force sensor 3 is connected in series with the fixed-length support rod 4. One end of the fixed-length support rod 4 is in contact with the solid-surface antenna 1. The force sensor 3 is used to record the force state of each fixed-length support rod 4 and monitor the force changes during the assembly and adjustment process.

[0030] Furthermore, the main support structure 5 includes several groups, each group including an adjustable strut 6 and a ball joint hinge 7; one end of the adjustable strut 6 is connected to the antenna reflector base 13 through an adjustable strut mounting foot 9, and the other end is connected to the fixed antenna 1 through an antenna mounting bracket 8; the ball joint hinge 7 is disposed between the adjustable strut 6 and the antenna mounting bracket 8, or between the antenna mounting bracket 8 and the fixed antenna 1, to release installation stress during antenna installation and adjustment.

[0031] Figure 2 and 3 In the above, the photogrammetry system 10 includes no less than four measuring cameras. The measuring cameras are networked measuring cameras, which are arranged around the fixed antenna 1. The optical axis of each measuring camera points to the center of the antenna reflector surface, and can be synchronously triggered to obtain the antenna's surface accuracy and error distribution cloud map in real time.

[0032] Furthermore, the movable robotic arm 11 has at least three degrees of freedom, and the laser displacement sensor 12 is mounted on the end effector of the movable robotic arm 11. The movable robotic arm 11 can position the laser displacement sensor 12 above each set of main support structures 5 to be assembled. In this embodiment, the laser displacement sensor 12 is a point-type laser displacement sensor or a line-type laser displacement sensor, used for non-contact measurement of the local deformation of the antenna reflector during the installation of the main support structure 5.

[0033] In a preferred embodiment, the auxiliary support structure 2 and the main support structure 5 are arranged alternately in space. The auxiliary support structure 2 is used to provide temporary support and monitor stress during the assembly process, while the main support structure 5 is used to provide permanent support after the antenna assembly is completed. The auxiliary support structure 2 is removed after the main support structure 5 is fully installed. After removal, the antenna reflector is independently supported by the main support structure 5, and the surface accuracy of the solid antenna 1 remains unchanged before and after removal.

[0034] Furthermore, in the case of splicing multiple solid surface antennas 1, the system includes a solid surface antenna 1 and at least one antenna spread lobes 1A and 1B. The solid surface antenna 1 first establishes an initial support state through the auxiliary support structure 2 and installs the main support structure 5. The antenna spread lobes 1A and 1B are then adjusted in terms of shape and position accuracy based on the solid surface antenna 1.

[0035] Example 2 like Figure 4 As shown, this invention also discloses a stress-free assembly monitoring method for large-size solid-surface antenna reflectors, applicable to stress monitoring and elimination during the assembly of single and multi-piece solid-surface antennas. The assembly and monitoring using the aforementioned stress-free assembly monitoring system for large-size solid-surface antenna reflectors includes the following steps: Step S1: Establishing the initial support state The initial support state of the solid surface antenna 1 is established by the auxiliary support structure 2, and the initial machining accuracy of the solid surface antenna 1 is used as a benchmark. The photogrammetry system 10 verifies and ensures that the measured surface accuracy of the solid surface antenna 1 in the initial support state matches the initial machining accuracy.

[0036] Specifically, step S1 further includes: S11: Measure the mass and centroid of the solid surface antenna 1 to obtain the initial machining accuracy data of the solid surface antenna 1; S12: Determine the theoretical support point locations and distribution of auxiliary support structure 2 through simulation analysis; S13: Install no less than three sets of auxiliary support structures 2, each set including a force sensor 3 and a fixed-length support rod 4; S14: Record the readings of each set of force sensors 3 as the initial reference values; S15: Use photogrammetry system 10 to detect the surface accuracy of solid antenna 1 and obtain measured accuracy data; S16: Determine whether the measured accuracy matches the initial machining accuracy. If they do not match, return to step S12 to redetermine the position and distribution of the support points until they match.

[0037] Step S2: Stress-free antenna assembly and precision adjustment While maintaining the initial support state, the main support structure 5 is installed, and at least one of the force sensor 3, laser displacement sensor 12 and photogrammetry system 10 is used to monitor in real time whether assembly stress is introduced during the assembly process. If stress change is detected, the installation is readjusted.

[0038] Specifically, step S2 further includes: S21: Install the laser displacement sensor 12 on the movable robotic arm 11 and place it above the main support structure 5 to be assembled. Monitor the deformation of the antenna reflector surface caused by assembly stress during the assembly process and record the initial reading of the laser displacement sensor 12. S22: Install a set of main support structures 5, adjust the length of the adjustable strut 6 according to the actual situation of the solid surface antenna 1 and the antenna reflector base 13, and adjust the matching between the antenna mounting bracket 8 and the mounting structure of the solid surface antenna 1 through the ball joint hinge 7 to avoid the introduction of installation stress; S23: During installation, monitor in real time whether the readings of the laser displacement sensor 12 and / or the force sensor 3 at the corresponding positions change; S24: If the reading of the laser displacement sensor 12 or the force sensor 3 changes, it is determined that assembly stress has been introduced, and reinstallation or interface matching needs to be checked; if the reading does not change, the main support structure 5 of this group is installed successfully. S25: Repeat steps S22 to S24 until all main support structures 5 are assembled.

[0039] Step S3: Antenna accuracy retest and confirmation After removing all auxiliary support structures 2, the surface accuracy of the solid antenna 1 is re-measured using the photogrammetry system 10. The re-measurement results are compared with the surface accuracy under the initial support state. If the two match, the assembly is complete.

[0040] Specifically, step S3 further includes: S31: After all the main support structures 5 are assembled, remove all the auxiliary support structures 2; S32: The surface accuracy of the solid antenna 1 is re-inspected by the photogrammetry system 10 to obtain the re-measurement accuracy data and error distribution cloud map; S33: Compare the remeasured accuracy data with the surface accuracy data under the initial support state, and compare the error distribution cloud maps; S34: If the two match, the assembly and adjustment work is completed; if they do not match, return to step S2 to adjust the surface accuracy.

[0041] like Figure 3As shown, for the case of splicing multiple reflectors, the support and precision adjustment of the solid antenna 1 are first completed according to the method of Example 2. Then, using the solid antenna 1 as a reference, the shape and position precision of the antenna unfolded lobes 1A and 1B are adjusted. After all antenna precision assembly and adjustment are completed, all auxiliary support structures 2 are removed. Then, the antenna shape precision is re-measured using the photogrammetry system 10. The shape precision and error distribution cloud map of the antenna at this time are compared with those in the initial support state until the two match, thus completing the assembly and adjustment work.

[0042] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A stress-free assembly monitoring system for the reflector surface of a large-size solid-surface antenna, characterized in that, include: Solid surface antenna (1); A support and adjustment system is used to support, fix and adjust the surface accuracy and position accuracy of the solid surface antenna (1); Deformation measurement and monitoring system is used for non-contact, real-time measurement and monitoring of surface accuracy and deformation during antenna assembly and adjustment; The support and adjustment system includes: Auxiliary support structure (2) is used to establish the initial support state of the antenna reflector; The main support structure (5) is used to adjust the surface accuracy and position accuracy of the solid surface antenna (1); The deformation measurement and monitoring system includes: Photogrammetry system (10) for non-contact measurement of antenna profile accuracy; Mobile robotic arm (11); At least one laser displacement sensor (12) is mounted on the movable robotic arm (11) for real-time monitoring of antenna deformation caused by assembly stress.

2. The stress-free assembly monitoring system for a large-size solid-surface antenna reflector according to claim 1, characterized in that, The auxiliary support structure (2) consists of no fewer than three groups, each group including a force sensor (3) and a fixed-length support rod (4). The force sensor (3) is connected in series with the fixed-length support rod (4). One end of the fixed-length support rod (4) is in contact with the solid-surface antenna (1). The force sensor (3) is used to record the force state of each fixed-length support rod and monitor the force changes during the assembly and adjustment process.

3. The stress-free assembly monitoring system for a large-size solid-surface antenna reflector according to claim 1, characterized in that, The main support structure (5) includes several groups, each group including an adjustable strut (6) and a ball joint hinge (7); one end of the adjustable strut (6) is connected to the antenna reflector base (13) through an adjustable strut mounting foot (9), and the other end is connected to the fixed antenna (1) through an antenna mounting bracket (8); the ball joint hinge (7) is located between the adjustable strut (6) and the antenna mounting bracket (8), or between the antenna mounting bracket (8) and the fixed antenna (1), and is used to release installation stress during antenna installation and adjustment.

4. The stress-free assembly monitoring system for a large-size solid-surface antenna reflector according to claim 1, characterized in that, The photogrammetry system (10) includes no less than four measuring cameras. The measuring cameras are networked measuring cameras, which are set around the solid surface antenna (1). The optical axis of each measuring camera points to the center of the antenna reflector surface, and can be synchronously triggered to obtain the antenna's surface accuracy and error distribution cloud map in real time.

5. The stress-free assembly monitoring system for the reflector surface of a large-size solid-surface antenna according to claim 1, characterized in that, The movable robotic arm (11) has at least three degrees of freedom, and the laser displacement sensor (12) is mounted on the end effector of the movable robotic arm (11). The movable robotic arm (11) is able to position the laser displacement sensor (12) above each set of main support structures (5) to be assembled.

6. The stress-free assembly monitoring system for a large-size solid-surface antenna reflector according to claim 1, characterized in that, The auxiliary support structure (2) and the main support structure (5) are arranged alternately in space. The auxiliary support structure (2) is used to provide temporary support and monitor stress during the assembly process, and the main support structure (5) is used to provide permanent support after the antenna assembly is completed. The auxiliary support structure (2) is removed after the main support structure (5) is fully installed. After removal, the antenna reflector is independently supported by the main support structure (5), and the surface accuracy of the solid surface antenna (1) remains unchanged before and after removal.

7. The stress-free assembly monitoring system for a large-size solid-surface antenna reflector according to claim 1, characterized in that, The solid surface antenna (1) is a single solid surface antenna or a combination of multiple solid surface antennas spliced ​​together. In the case of multiple solid surface antennas spliced ​​together, the system includes a solid surface antenna (1) and at least one antenna spread lobe (1A, 1B). The solid surface antenna (1) first establishes an initial support state through an auxiliary support structure (2) and installs a main support structure (5). The antenna spread lobe (1A, 1B) is then adjusted in terms of shape and position accuracy based on the solid surface antenna (1).

8. A method for stress-free assembly and monitoring of the reflector surface of a large-size solid-surface antenna, characterized in that, Assembly and monitoring using the stress-free assembly monitoring system for the large-size solid-surface antenna reflector as described in any one of claims 1-7 includes the following steps: Step S1: Establishing the initial support state The initial support state of the solid surface antenna (1) is established by the auxiliary support structure (2), and the initial processing accuracy of the solid surface antenna (1) is used as a reference. The actual surface accuracy of the solid surface antenna (1) under the initial support state is verified by the photogrammetry system (10) and ensured that it matches the initial processing accuracy. Step S2: Stress-free antenna assembly and precision adjustment While maintaining the initial support state, the main support structure (5) is installed, and at least one of the force sensor (3), laser displacement sensor (12) and photogrammetry system (10) is used to monitor in real time whether assembly stress is introduced during the assembly process. If stress change is detected, the installation is readjusted. Step S3: Antenna accuracy retest and confirmation After removing all auxiliary support structures (2), the surface accuracy of the solid surface antenna (1) is re-measured using a photogrammetry system (10). The re-measurement results are compared with the surface accuracy under the initial support state. If the two match, the assembly is completed.

9. The method for stress-free assembly and monitoring of the reflector surface of a large-size solid-surface antenna according to claim 8, characterized in that, Step S1 further includes: S11: Measure the mass and centroid of the solid surface antenna (1) to obtain the initial machining accuracy data of the solid surface antenna (1); S12: Determine the theoretical support point location and distribution of the auxiliary support structure (2) through simulation analysis; S13: Install no less than three sets of auxiliary support structures (2), each set including a force sensor (3) and a fixed-length support rod (4); S14: Record the readings of each set of force sensors (3) as the initial reference values; S15: Use a photogrammetry system (10) to detect the surface accuracy of the solid antenna (1) and obtain the measured accuracy data; S16: Determine whether the measured accuracy matches the initial machining accuracy. If they do not match, return to step S12 to redetermine the position and distribution of the support points until they match.

10. The method for stress-free assembly and monitoring of the reflector surface of a large-size solid-surface antenna according to claim 8, characterized in that, Step S2 further includes: S21: Install the laser displacement sensor (12) on the movable robotic arm (11) and place it above the main support structure (5) to be assembled, and record the initial reading of the laser displacement sensor (12); S22: Install a set of main support structures (5), adjust the length of the adjustable strut (6) according to the actual situation of the solid surface antenna (1) and the antenna reflector base (13), and adjust the matching between the antenna mounting bracket (8) and the solid surface antenna (1) mounting structure through the ball joint hinge (7); S23: During the installation process, monitor in real time whether the readings of the laser displacement sensor (12) and / or the force sensor (3) at the corresponding positions change; S24: If the reading of the laser displacement sensor (12) or the force sensor (3) changes, it is determined that assembly stress has been introduced, and it is necessary to reinstall or check the interface matching; if the reading does not change, the main support structure (5) of this group is installed qualified. S25: Repeat steps S22 to S24 until all main support structures (5) are assembled.

11. The method for stress-free assembly and monitoring of the reflector surface of a large-size solid-surface antenna according to claim 8, characterized in that, Step S3 further includes: S31: After all the main support structures (5) are assembled, remove all the auxiliary support structures (2); S32: The surface accuracy of the solid antenna (1) is re-detected through the photogrammetry system (10) to obtain the re-measurement accuracy data and error distribution cloud map; S33: Compare the remeasured accuracy data with the surface accuracy data under the initial support state, and compare the error distribution cloud maps; S34: If the two match, the assembly and adjustment work is completed; if they do not match, return to step S2 to adjust the surface accuracy.

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