基于虚拟相机的天线俯仰轴形变快速高精度测量方法研究  

Research on Rapid and High Precision Measurement Method of Antenna Pitch Axis Deformation Based on Virtual Camera

作　　者：于琳琳 许谦[1,2,3] 王娜 Yu Linlin;Xu Qian;Wang Na(Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, China;Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing 210033, China;Key Laboratory of Xinjiang Radio Astrophysics, Urumqi 830011, China;University of Chinese Academy of Sciences, Beijing 100049, China)

机构地区：[1]中国科学院新疆天文台,新疆乌鲁木齐830011 [2]中国科学院射电天文重点实验室,江苏南京210033 [3]新疆射电天体物理重点实验室,新疆乌鲁木齐830011 [4]中国科学院大学,北京100049

出　　处：《天文研究与技术》2022年第3期235-243,共9页Astronomical Research & Technology

基　　金：国家自然科学天文联合基金(U1731135);中国科学院“西部之光”人才培养引进计划(2017-XBQNXZ-B-024);新疆维吾尔自治区天山雪松计划(2020XS12);新疆维吾尔自治区天山创新团队计划(2018D14008);中国科学院天文台站设备更新及重大仪器设备运行专项;中国科学院青年创新促进会(Y202019);新疆维吾尔自治区天池百人计划(2017);新疆射电天体物理重点实验室专项资助.

摘　　要：长期的磨损和扭转会使天线俯仰轴结构发生小尺度形变。实现这一形变的快速高精度测量,对于大口径全可动天线指向精度修正和俯仰轴健康监测具有非常重要的价值。搭建了单相机测量系统,建立了一种虚拟相机数学模型,将结构变形转为空间变换进行求解,从而提出了一种俯仰轴形变快速测量方法。实验结果表明,该方法的平移分量综合精度可达0.2825 mm,旋转分量精度最低可达0.2918°,能够实现俯仰轴1 mm尺度变形的快速测量。该方法具有非接触、精度高、速度快等优点,满足大口径、高频段、高精度射电望远镜俯仰轴长期快速测量的需求,也适用于其他大结构的小变形测量。Long term wear and torsion will cause small-scale deformation of antenna pitch axis structure.The rapid and high-precision measurement of this deformation is of great value for the pointing accuracy correction of large aperture fully movable antenna and the health monitoring of pitch axis.In this paper,a single camera measurement system is built,a virtual camera mathematical model is established,and the structural deformation is transformed into spatial transformation for solution,so a rapid measurement method of pitch axis deformation is proposed.The experimental results show that the method can achieve an integrated accuracy of 0.2825 mm(rms)for the translation component and 0.2918°for the rotation component,and is capable of rapid measurement of 1mm scale deformation of the pitch axis.The system and its method have the advantages of non-contact,high precision and rapidity,and can meet the demand for long-term rapid measurements of the pitch axis of large-aperture,high-frequency radio telescopes with high accuracy,and are also applicable to the measurement of small deformations of other large structures.

关 键 词：虚拟相机 大口径射电望远镜 天线俯仰轴 小尺度变形 目标空间变换 

分 类 号：P111.5[天文地球—天文学]