上海天马望远镜光程差的计算方法研究

发布时间：2018-02-23 23:26

本文关键词： 望远镜方法数据分析技术其他诸多方面　出处：《天文学报》2016年02期 　论文类型：期刊论文

【摘要】：基于上海天马望远镜(Shanghai Tian Ma Telescope,简称TM),提出一种赋形卡塞格伦天线光程差的计算方法.首先,基于天线互易定理,建立天马望远镜光路的数学模型;其次,采用非均匀有理B样条拟合天马望远镜的主面和副面;最终,实现光程差的计算方法,并对鲁兹光程差公式在天马望远镜上的扩展应用进行研究.采用此方法可计算馈源、副面的轴向偏移和横向偏移以及副面旋转等非准直情况下的光程差,同时在非准直量较小时,可采用扩展鲁兹光程差公式快速计算光程差.为天马望远镜结构的实时测量和调整提供支持,同时相关研究也具有通用性,可为其他具有赋形面型的射电望远镜光程差的计算提供参考.
[Abstract]:Based on the Shanghai Tian Ma Telescope, a method for calculating optical path difference of shaped Cassegrain antenna is presented. Firstly, based on the theorem of antenna reciprocity, the mathematical model of the optical path of the Telescope is established. Non-uniform rational B-spline is used to fit the main plane and auxiliary plane of the telescope. Finally, the calculation method of optical path difference is realized, and the extended application of Luz optical path difference formula to the Tianma telescope is studied. The feed source can be calculated by using this method. The optical path difference in the case of axial migration and lateral migration of the auxiliary plane and the non-collimation of the side plane rotation, and at the same time the non-collimation amount is small, The extended Lutz optical path difference formula can be used to calculate the optical path difference quickly. It provides support for the real-time measurement and adjustment of the structure of the Tianma telescope, and the related research is also universal. It can provide reference for the calculation of optical path difference of other radio telescopes with shaped surface.
【作者单位】：中国科学院上海天文台;中国科学院射电天文重点实验室;中国电子科技集团公司第54研究所;
【基金】：国家自然科学基金项目(11503070) 天文专项-高精度测量与控制(Y587141002) 中国科学院上海天文台青年创新基金项目(Y597061009)资助
【分类号】：P111.44

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