Measuring the Deflection of the Vertical via Local Reference Point Surveying and Pointing Calibration of a VLBI Telescope: A Case Study at the Urumqi Station

doi:10.1029/2021EA001781

	Measuring the Deflection of the Vertical via Local Reference Point Surveying and Pointing Calibration of a VLBI Telescope: A Case Study at the Urumqi Station
	Zhang, Zhibin 1,2; Ma, Xiaohui 3; Sun, Zhongmiao 3; Zhang, Ali 4; Yuan, Ye 4; Sun, Zhengxiong 2
刊名	EARTH AND SPACE SCIENCE
	2021-10-01
卷号	8 期号:10 页码:13
关键词	VLBI deflection of the vertical reference point axis-related errors axis offset
DOI	10.1029/2021EA001781
通讯作者	Zhang, Zhibin(zbzhang@shao.ac.cn)
英文摘要	According to Newton's law of universal gravitation, the movement of matter and the change in density cause a gravitational variation. Due to the anisotropic distribution of matter, the vertical and the normal directions at a point on the ground are probably inconsistent, which is referred to as the deflection of the vertical (DOV) and is indispensable to astrogeodetic and geophysics research. Two new non-optical methods, including small network transformation and azimuth-axis inclination inversion, are proposed to determine the DOV at a very long baseline interferometry (VLBI) telescope at the Urumqi station. A generalized expression of the pointing calibration model considering axis-related errors is also presented. Therefore, the pointing calibration model and indirect model used for reference point (RP) determination are unified by redefining their coordinate system, angle direction, and axis-related errors. The DOV given by the small network transformation agrees well with the DOVs determined by the real surveying and other different models. Due to the possible asymmetric coverage of calibrating sources in the north-south direction in antenna pointing calibration, the north-south DOV component based on azimuth-axis inclination inversion differs from the surveyed value. However, the west-east DOV component fits well in both direction and magnitude. The proposed methods enable the VLBI telescope to sense the direction of the local plumb line by introducing local leveling. We also establish the connections among VLBI delay observation, RP determination, and telescope pointing calibration, which has a benefit to multi-tech systematic error identification, monitoring, and correction. The research indicates that telescope point calibration can also be taken as a regular technique to monitor systematic error.
资助项目	National Natural Science Foundation of China[11873077]
WOS关键词	RADIO TELESCOPE ; MM-ACCURACY ; NETWORK ; MODEL
WOS研究方向	Astronomy & Astrophysics ; Geology
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000711969700020
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/4321]
专题	新疆天文台_光学天文与技术应用研究室
通讯作者	Zhang, Zhibin
作者单位	1.Univ Chinese Acad Sci, Beijing, Peoples R China 2.Chinese Acad Sci, Shanghai Astron Observ, Shanghai, Peoples R China 3.Xian Res Inst Surveying & Mapping, Xian, Peoples R China 4.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Zhibin,Ma, Xiaohui,Sun, Zhongmiao,et al. Measuring the Deflection of the Vertical via Local Reference Point Surveying and Pointing Calibration of a VLBI Telescope: A Case Study at the Urumqi Station[J]. EARTH AND SPACE SCIENCE,2021,8(10):13.
APA	Zhang, Zhibin,Ma, Xiaohui,Sun, Zhongmiao,Zhang, Ali,Yuan, Ye,&Sun, Zhengxiong.(2021).Measuring the Deflection of the Vertical via Local Reference Point Surveying and Pointing Calibration of a VLBI Telescope: A Case Study at the Urumqi Station.EARTH AND SPACE SCIENCE,8(10),13.
MLA	Zhang, Zhibin,et al."Measuring the Deflection of the Vertical via Local Reference Point Surveying and Pointing Calibration of a VLBI Telescope: A Case Study at the Urumqi Station".EARTH AND SPACE SCIENCE 8.10(2021):13.