CN-121977474-A - Large-size mesh antenna profile measuring method based on total station scanner

CN121977474ACN 121977474 ACN121977474 ACN 121977474ACN-121977474-A

Abstract

The invention relates to a large-size mesh antenna profile measuring method based on a total station scanner, which utilizes a laser tracker to establish a global control reference, adopts the total station scanner to acquire point cloud data of the surface of a mesh antenna at a plurality of stations, and carries out registration analysis with a standard digital model to obtain antenna profile deviation, and the technical scheme is that the method comprises the following steps of S1, antenna type surface point cloud acquisition; the method comprises the steps of S2, splicing the obtained point cloud data, S3, roughly processing the surface point cloud data, S4, finely processing the surface point cloud data, S5, analyzing and obtaining the antenna surface deviation, and the measuring method can not only obtain a large amount of point cloud data on the surface of the large-size mesh antenna, but also expand the measuring field range aiming at the antenna size, break through the limitation of the measuring range, finely reflect the surface state of the mesh antenna, and remarkably improve the measuring efficiency when facing the ultra-large or ultra-large antenna.

Inventors

WANG WEIFENG
HUANG GUIPING
ZHANG JIAHUI
WANG MENGCHEN
MA KAIFENG
FAN QINHONG
ZHANG YIFAN
SUN YUANQI

Assignees

华北水利水电大学
郑州辰维科技股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260206

Claims (7)

1. The large-size mesh antenna profile measuring method based on the total station scanner is characterized by comprising the following steps of: s1, antenna type surface point cloud acquisition According to the spatial distribution of the shape, the size and the like of the mesh antenna, control points are distributed by depending on a target seat and a target ball of a tracker, and the coordinates of all the control points are measured by a measuring station by adopting a laser tracker; s2, splicing the acquired point cloud data After the scanning is finished, importing the data in the total station scanner into matched software for splicing, wherein spliced point clouds have obvious mixed point noise, and the spliced point clouds mainly comprise the antenna frame net surface, an antenna back support structure and point cloud data on frame nodes, and further removing mixed points by subsequent point clouds; s3, rough processing of surface point cloud data Because the MS60 scanning process belongs to indiscriminate measurement, the point cloud data of the antenna network surface is obtained, and meanwhile, the point cloud on the back support structure of the antenna and the frame node is obtained, the point cloud data which is obviously deviated from the antenna network surface can be deleted in software in a direct frame selection mode, the point cloud data on the frame node is tightly attached to the antenna network surface, the antenna network surface and the node belong to different materials, the intensity values of the corresponding point cloud data are different, and the point cloud data are separated according to the reflectivity according to the attribute; S4, fine processing of surface point cloud data After the rough treatment is finished, most of miscellaneous points are removed, and the miscellaneous points still exist at the net surface and the frame nodes of the antenna frame, so that the point cloud fine treatment is needed to be further carried out, a standard CAD antenna digital model is imported, the frame node point cloud and the frame net surface point cloud are separated through registering with the digital model, the digital model and the net surface are registered again after the separation, the digital model is moved, the separation operation is repeated until the miscellaneous points are removed completely, and the processed antenna point cloud is obtained; s5, analyzing to obtain the antenna profile deviation After removing the mixed points, the complete point cloud is obtained by removing the mixed points such as the hanging points, the nodes and the like, the network point cloud is reserved to the greatest extent, and the antenna network point cloud data and the design model of the antenna are subjected to comparison analysis to obtain the antenna profile deviation.
2. The method for measuring the profile of the large-size mesh antenna based on the total station scanner according to claim 1, wherein in the step S1, all control point coordinates are measured by using a single-point measuring function of an instrument to measure more than 4 control point coordinates, the control point coordinates calibrated by the laser tracker are used as coordinate conversion references, a measurement coordinate system of the total station scanner is converted into a control field coordinate system, and after one-station scanning of the total station scanner is completed, the next station is moved until all acquired point cloud data cover all surfaces of the antenna.
3. The method for measuring the profile of a large-sized mesh antenna based on a total station scanner according to claim 1, wherein in S1, the total station scanner model is MS60.
4. The method for measuring the profile of a large-size mesh antenna based on a total station scanner according to claim 1, wherein in S1, at least 5 target ball control points are arranged.
5. The method for measuring the profile of a large-size mesh antenna based on a total station scanner according to claim 1, wherein in the step S1, the station measuring position surrounds the periphery of the antenna and is located at the side of the antenna, such station setting distribution is favorable for obtaining control points used for red cross sign representation of point cloud scanning at two sides of the parabolic antenna, one control point can be used by a plurality of station setting, and a plurality of control points surround the antenna, so that each station setting can use four to five control points for orientation.
6. The method for measuring the profile of the large-size mesh antenna based on the total station scanner according to claim 1, wherein in the step S1, the advancing direction of the station is from one side of the antenna to the other side, and when the scanning range frame selection is performed from the next station setting position, a certain degree of overlapping is required to be performed with the last station, so that the integrity of the antenna point cloud is ensured.
7. The method for measuring the profile of the large-size mesh antenna based on the total station scanner according to claim 1, wherein in the step S2, the spliced complete point cloud is a circular paraboloid.

Description

Large-size mesh antenna profile measuring method based on total station scanner Technical Field The invention relates to the field of large-size spaceborne mesh antenna profile measurement, in particular to a large-size mesh antenna profile measurement method based on a total station scanner. Background The space-borne antenna is an important component of the spacecraft, the working quality of the aerospace equipment is directly determined by the profile precision of the space-borne antenna, and the high-precision space-borne antenna is always the focus of the international aerospace field research. In the case of a space-borne deployable antenna, an antenna having a reflector aperture of 4m or greater is referred to as a large-sized antenna, and a large-sized space-deployable antenna of 20m or more is generally referred to as an ultra-large-sized deployable antenna, and an antenna having a reflector aperture of 50m or more and up to hundred meters is referred to as an ultra-large-aperture deployable antenna. The invention provides a large-size antenna which is an expandable antenna with the caliber of more than 10 m. At present, various measuring methods for antenna profile measurement at home and abroad are available, including theodolite system intersection measuring method, total station measuring method, articulated arm type coordinate measuring machine measuring method, industrial photogrammetry and the like, and the industrial photogrammetry is mainly adopted in the direction of measuring the expandable antenna profile. The traditional industrial photogrammetry needs to paste mark points on a measured object, and for the measurement of the large-size mesh antenna profile, a large number of mark points need to be pasted, so that the early preparation time of the measurement is long, the weight of the mark points can also influence the antenna profile, and as the size of the antenna is increased, the overall photo splicing difficulty of the industrial photogrammetry is increased, the splicing precision is obviously reduced, and the requirement of the large-size mesh antenna profile measurement is difficult to adapt. The three-dimensional laser scanning technology is a measuring technology which is rapidly developed in recent years, and can rapidly acquire massive point cloud data of the surface of the measured object, so that the appearance of the measured object is finely measured. At present, some expert and scholars at home and abroad try to measure the profile of the large-size spaceborne mesh antenna by adopting a three-dimensional laser scanning technology, and as key technologies such as high-precision splicing of multi-station point cloud data, fine segmentation of point cloud and the like are not broken through, only the measurement of the profile of the small-size solid-surface antenna is realized, and a specific and systematic method is not formed for the measurement of the profile of the large-size mesh antenna. With the development of aerospace technology, the mesh antenna gradually becomes the main stream of the space-borne antenna, the size of the mesh antenna is larger and larger, the profile precision requirement is more and more severe, and the requirement of antenna assembly and manufacturing is more and more difficult to meet when the industrial photogrammetry is adopted to measure the profile of the large-size mesh antenna. Therefore, improvements and innovations in the profile measurement method of large-sized mesh antennas are currently a need for solving the problems. Disclosure of Invention Based on the technical background, the invention aims to provide a large-size mesh antenna profile measuring method based on a total station scanner, which utilizes a laser tracker to establish a global control reference, adopts the total station scanner to acquire point cloud data of the surface of a mesh antenna at a plurality of stations, and carries out registration analysis with a standard digital model to obtain the antenna profile deviation. The technical scheme provided by the invention comprises the following steps: s1, antenna type surface point cloud acquisition According to the spatial distribution of the shape, the size and the like of the mesh antenna, control points are distributed by depending on a target seat and a target ball of a tracker, and the coordinates of all the control points are measured by a measuring station by adopting a laser tracker; s2, splicing the acquired point cloud data After the scanning is finished, importing the data in the total station scanner into matched software for splicing, wherein spliced point clouds have obvious mixed point noise, and the spliced point clouds mainly comprise the antenna frame net surface, an antenna back support structure and point cloud data on frame nodes, and further removing mixed points by subsequent point clouds; s3, rough processing of surface point cloud data Because the MS60 scanning process belongs to indiscrimina