倾斜仪在提高TM65 m射电望远镜指向精度上的应用  

Using inclinometer to improve the pointing accuracy of TM65 m radio telescope

作　　者：虞林峰[1,2] 王锦清[1,2,3] 蒋甬斌 江永琛[1,2] 赵融冰[1,2] 苟伟[1,2] YU LinFeng;WANG JinQing;JIANG YongBin;JIANG YongChen;ZHAO RongBing;GOU Wei(Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China;Key Laboratory of Radio Astronomy,Chinese Academy of Sciences,Nanjing 210008,China;Shanghai Key Laboratory of Space Navigation and Positioning Technology,Shanghai 200030,China)

机构地区：[1]中国科学院上海天文台,上海200030 [2]中国科学院射电天文重点实验室,南京210008 [3]上海市空间导航与定位技术重点实验室,上海200030

出　　处：《中国科学：物理学、力学、天文学》2019年第12期147-155,共9页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家重点研发计划(编号:2018YFA0404702);国家自然科学基金(编号:11873015);中国科学院关键技术人才项目资助

摘　　要：本文主要论述了上海天文台天马65 m射电望远镜(以下简称为TM65 m)如何利用倾斜仪来提高其指向精度.首先对倾斜仪的型号特点及其安装作了介绍,然后通过扫描射电源法比较了白天和夜晚指向差异的情况,通过与倾斜仪测量数据的比较分析了这一差异主要是温度梯度引起望远镜座架变形导致的,并利用倾斜仪的数据对其进行了有效的补偿.另外本文还介绍了用倾斜仪对TM65 m轨道不平度进行测量,根据望远镜自身特点,得到了"不同俯仰上的轨道不平度",比较了指向模型在分离轨道不平度前后的拟合精度,讨论了轨道模型分离后对指向模型精度提升的有效性.This paper mainly discusses how the inclinometer be used on the Tianma 65-meter radio telescope of Shanghai Astronomical Observatory(TM65 m)to help to improve the pointing accuracy.Firstly,the model and installation of the inclinometer are described.Then,the difference of pointing errors between day and night is introduced,after be compared with the data of the inclinometer,the tilt of the mount caused by the thermal gradient is considered as the source.After that,the data is tried to be used to compensate the difference.Moreover,the unevenness of the track is measured by the inclinometer,according to the characteristics of TM65 m,"the track unevenness of different elevation"is acquired,the data are separated from the pointing model.The improvement of accuracy of pointing model is described.

关 键 词：射电望远镜 指向精度 倾斜仪 轨道不平度 

分 类 号：P31[天文地球—固体地球物理学]