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| 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, Zhibin1,2 ; Ma, Xiaohui3; Sun, Zhongmiao3; Zhang, Ali4; Yuan, Ye4; Sun, Zhengxiong1
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| 2021-10-01 | |
| Source Publication | EARTH AND SPACE SCIENCE
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| Volume | 8Issue:10Pages:e2021EA001781 |
| Contribution Rank | 4 |
| Abstract | 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. |
| Keyword | VLBI deflection of the vertical reference point axis-related errors axis offset |
| DOI | 10.1029/2021EA001781 |
| Indexed By | SCI |
| Language | 英语 |
| WOS Keyword | RADIO TELESCOPE ; MM-ACCURACY ; NETWORK ; MODEL |
| Funding Project | National Natural Science Foundation of China[11873077] |
| WOS Research Area | Astronomy & Astrophysics ; Geology |
| WOS Subject | Astronomy & Astrophysics ; Geosciences, Multidisciplinary |
| WOS ID | WOS:000711969700020 |
| Publisher | AMER GEOPHYSICAL UNION |
| Funding Organization | National Natural Science Foundation of China |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.xao.ac.cn/handle/45760611-7/4322 |
| Collection | 光学天文与技术应用研究室 射电天文研究室_天线技术实验室 科研仪器设备产出_利用南山26米射电望远镜（NSRT）观测数据的文章 |
| Corresponding Author | Zhang, Zhibin |
| Affiliation | 1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Xian Res Inst Surveying & Mapping, Xian, Peoples R China 4.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi, Peoples R China |
| Recommended Citation 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):e2021EA001781. |
| 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),e2021EA001781. |
| 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):e2021EA001781. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| Zhang-2021-Measuring（1416KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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