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Alternative TitleResearch on Measurement Method of Radio Telescope Reference Point
Thesis Advisor陈卯蒸
Degree Grantor中国科学院大学
Place of Conferral北京
Degree Name理学硕士
Degree Discipline天文技术与方法
Keyword射电望远镜 参考点 Radio telescope 轴线偏差 reference point GNSS axis offset 仿真分析 GNSS simulation analysis
Other AbstractAccurate measurement of the reference point coordinates and axis offset of the radio telescope is of great significance for establishing the antenna pointing model and local tie vector, and improving the coordinate accuracy of the station. The common local survey method needs to arrange a local control network around the antenna, which involves the conversion between the local coordinate system and the geocentric coordinate system, and the measurement process is complicated. In the parameterized modeling of the antenna rotation survey method, the azimuth and elevation angles of the radio telescope are solved as lknown quantities, so this method is not applicable to the newly-built radio telescopes that have not yet established a pointing model. In order to quickly determine the initial reference value of the reference point coordinates of the newly-built radio telescope, according to the rotation model of the telescope, combined with the common local survey method and the parameterized modeling of the antenna rotation survey method,a method of using GNSS instead of the measurement target to realize the telescope reference point measurement is proposed. The data is collected in two different rotation modes of the radio telescope. The trace of the GNSS antenna in the single-axis rotation mode is a space circle, and spatially rounded fitting is performed on the data acquired around the azimuth axis and the elevation axis to determine theposition and orientation of the azimuth axis and the elevation axis. The trace of the GNSS antenna in the random rotation mode is the point in the strip region on the space sphere, and the spherical center coordinates obtained by the sphere fitting of the collected data are the reference point coordinates. The effectiveness of the proposedmethod is verified by the simulation data. The influence of GNSS positioning accuracy and the number of acquired data points on the accuracy of antenna reference point and axis offset calculation is analyzed. It provides theoretical guidance for the actual measurement of the radio telescope reference point. The advantage of this method is that it does not need to establish a measurement base pier, and does not involve the conversion between local coordinates and geocentric coordinates when the data is fitted, and does not depend on the pointing model of the antenna. The fitting accuracy of the space circle determines the accuracy of the antenna parameters. For the spatial circle fitting,a fitting method based on genetic algorithm is proposed. The accuracy and reliability of the method are verified by simulation data and example data. In the single-axis rotation mode, the data points collected by rotating around the elevation axis are distributed on the circular arc segment less than 1/4 of the spatial circle, and sometimes the fitting is not stable. Therefore,a space circle fitting method that is easy to be implemented and has better stability is selected.
Document Type学位论文
First Author AffilicationXinjiang Astronomical Observatory, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
刘耘. 射电望远镜参考点测量方法的研究[D]. 北京. 中国科学院大学,2019.
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刘耘-硕士学位论文最终版.pdf(3050KB)学位论文 暂不开放CC BY-NC-SAApplication Full Text
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