The Five-hundred-meter Aperture Spherical radio Telescope (FAST) project locates in the mountainous region of Guizhou Province, China. Due to the huge scale of the project and the precise observation performance requirements of the telescope, the reflector unit is required to have characteristics of small quality and high precision. Due to the high humidity on the site, it is necessary to ensure that the reflective surface unit has good anti-corrosion properties. This article studies how to solve the problem of the structural performance of the reflective surface unit and its implementation method. Based on the research in this paper, the error of the surface accuracy of the reflecting surface unit is less than 2.5 mm, and the central deflection of the block constituting the unit is less than 1 mm. In addition, this type of unit has good anti-corrosion properties. This paper also proposes the method of accuracy assurance in the construction process. In the end, the research results were successfully applied to the FAST project.
As the most important feedback source of the FAST telescope control system, the measurement system directly determines the overall performance and observing efficiency of FAST. High-precision total station measurement equipment is used in real-time measurement of the FAST reflector and the feed cabin. Because the measurement accuracy of total station is easily influenced by the atmospheric environment, in this paper, we established the distribution model of temperature, humidity and pressure through the meteorological information collected by the weather stations evenly distributed in the reflector. We analyzed the changes of atmospheric environment caused by FAST topography and calculated the real-time atmospheric correction at each location within the coverage of the weather station based on the formula. Finally, according to the variation of the atmospheric correction value in the measurement path, the optimal atmospheric correction parameter of the path is obtained, so as to improve the measurement accuracy of the FAST reflector.
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