网络构型对三维坐标控制网精度影响的研究
中国工程物理研究院, 激光聚变研究中心, 四川绵阳 621900
| 摘 要： | 高精度三维坐标控制网是大科学装置各类大型模块现场安装的基础。天文望远镜等光学装置的规模通常可达到数十米以上，其大口径光机模块的安装精度要求可达到亚毫米量级。针对光学装置大口径光机模块精密安装的坐标控制需求，本文拟通过测量与分析，研究坐标网络的网形对坐标网络精度及可靠性的影响。首先，本文在18m×18m的区域内布置29个测点和4个测站，通过测量与分析得到各测点在第一测站坐标系中的坐标值，形成三维坐标控制网络。然后，通过测线筛选分别构建对全连接网络、回形闭环网络和回形开环网络。最后，基于控制网广义可靠性理论，从各测点的不确定度、网络中各测点到测站距离的分析值与实测值的差异、控制网络长标尺的长度分析值与标称值的差异等多方面对网络的精度进行评估。结果表明，全连接网络内各测点的误差不超过40μm，其精度与可靠性最高，回形开环网络的精度与可靠性最低。 |
| 关 键 词： | 大口径光机模块; 三维坐标控制网; 激光跟踪仪; 统一空间测量网络 |
| DOI： | 10.57237/j.earth.2023.01.002 |
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收稿日期: 2023-09-11
接受日期: 2023-10-26
在线出版日期: 2023-10-28
Study on the Influence of Network Configuration on the Accuracy of 3D Coordinate Control Network
Laser Fusion Research Center, Chinese Academy of Engineering Physics, Mianyang 621900, China
| Abstract: | The high-precision 3D coordinate control network is the foundation for on-site installation of various large-scale modules in large-scale scientific facility. The scale of optical devices such as astronomical telescopes can usually reach tens of meters or more, and the installation accuracy of their large aperture optical mechanical modules can reach the sub-millimeter level. In response to the coordinate control requirements for the precise installation of large aperture optical mechanical modules in optical devices, this article intends to study the impact of the grid shape of the coordinate network on the accuracy and reliability of the coordinate network through measurement and analysis. Firstly, 29 measurement points and 4 stations are arranged within an 18m× 18m area in this article, and the coordinate values of each measurement point in the first station coordinate system are obtained through measurement and analysis, forming a 3D coordinate control network. Then, a fully connected network, a loop back close network, and a loop back open network are constructed through line screening. Finally, based on the generalized reliability theory of control networks, the accuracy of the network is evaluated from various aspects such as the uncertainty of each measurement point, the difference between the analyzed and measured values of the distance from each measurement point to the measurement station in the network, and the difference between the analyzed and nominal values of the length of the control network's long scale. The results indicate that the error of each measurement point in the fully connected network does not exceed 40 μ m. The fully connected network has the highest accuracy and reliability, while the loop open loop network has the lowest accuracy and reliability. |
| Keywords: | Large Aperture Optical Mechanical Module; 3D Coordinate Control Network; Laser Tracker; Unified Spatial Measurement Network |
基金
| 1. | 国家自然科学基金项目 (U20A20215) |
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