Subreflector model depending on elevation for the Tianma 65 m Radio Telescope

Subreflector model depending on elevation for the

Tianma 65 m Radio Telescope

Zheng-Xiong Sun;Jin-Qing Wang;Lan Chen

【期刊名称】《天文和天体物理学研究》 【年(卷),期】2016(016)008

【摘要】A subreflector adjustment system for the Tianma 65 m radio telescope,administered by Shanghai Astronomical Observatory,has been installed to compensate for gravitational deformation of the main reflector and the structure supporting the subreflector.The position and attitude of the subreflector are variable in order to improve the efficiency at different elevations.The subreflector model has the goal of improving the antenna's performance.A new fitting formulation which is different from the traditional formulation is proposed to reduce the fitting error in the Y direction.The only difference in the subreflector models of the 65 m radio telescope is the bias of a constant term in the Z direction.We have investigated the effect of movements of the subreflector on the pointing of the antenna.The results of these performance measurements made by moving the antenna in elevation show that the subreflector model can effectively improve the efficiency of the 65 m radio telescope at each elevation.An antenna efficiency of about 60％ at the Ku band is reached in the whole angular range of elevation.

【总页数】8页(9-16) 【关键词】

【作者】Zheng-Xiong Sun;Jin-Qing Wang;Lan Chen

【作者单位】Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China;Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China;Shanghai Institute of Technology, Shanghai 201400, China 【正文语种】英文 【中图分类】 【文献来源】

https://www.zhangqiaokeyan.com/academic-journal-cn_research-astronomy-astrophysics_thesis/0201254255570.html 【相关文献】

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