台址内部设备瞬态干扰引起的110 m射电望远镜近场耦合计算方法  

Calculation method of near-field coupling of a 110-m radiotelescope caused by transient radiation interference ofequipment within the observatory site

作　　者：彭涣欢 邹棋 肖培 刘萌瑶 蔡明辉[2] 刘奇[2] 李高升 PENG HuanHuan;ZOU Qi;XIAO Pei;LIU MengYao;CAI MingHui;LIU Qi;LI GaoSheng(College of Electrical and Information Engineering,Hunan University,Changsha 410082,China;Xinjiang Astronomical Observatory,Chinese Academy of Sciences,Urumqi 830011,China)

机构地区：[1]湖南大学电气与信息工程学院,长沙410082 [2]中国科学院新疆天文台,乌鲁木齐830011

出　　处：《中国科学：物理学、力学、天文学》2024年第1期108-118,共11页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家重点研发计划(编号:2021YFC2203503);新疆维吾尔自治区自然科学基金(编号:2021D01E07)资助项目。

摘　　要：射电望远镜具有高灵敏度和高分辨率的特性,台址内部微弱的电磁干扰会影响其工作状态,增加天文观测难度.本文针对110 m射电望远镜台址内部瞬态辐射干扰引起的近场耦合问题,提出了一种基于偶极子近似和时域物理光学的混合计算方法.首先对台址内部设备瞬态干扰源进行分析,利用偶极子天线理论对近场辐射源进行分析与建模,结合时域物理光学法分析并计算了台址内部干扰源对射电望远镜天线口径面近场的电磁耦合特性,最后结合Feko全波算法验证本文方法的有效性.本文方法为110 m射电望远镜台址内部辐射干扰对天文观测的影响分析提供了理论支撑.Radio telescopes are renowned for their high sensitivity and resolution. However, subtle electromagnetic interferencefrom internal sources within the observatory site can considerably disrupt their operational state, thereby aggravating thechallenges associated with astronomical observations. This study addresses the issue of near-field coupling induced bytransient radiation interference from internal sources within the observatory site of the 110-m radio telescope. For thispurpose, a hybrid calculation method based on dipole approximation and time-domain physical optics is proposed. Theanalysis commences with a meticulous examination of transient radiation interference emanating from internal sources atthe observatory site. Leveraging the principles of dipole antenna theory, the near-field radiation sources are analyzed andaccurately modeled. By integrating the time-domain physical optics approach, the electromagnetic couplingcharacteristics of the internal sources of radiation interference on the near-field aperture plane of the radio telescopeare comprehensively analyzed and quantified. Finally, the efficacy of the proposed method is validated using the FEKOfull-wave algorithm. The proposed method serves as a theoretical foundation for analyzing the influence of interferencefrom internal sources of radiation at the observatory site on the astronomical observations of the 110-m radio telescope.

关 键 词：射电望远镜 瞬态干扰 近场耦合 物理光学法 

分 类 号：P111.44[天文地球—天文学]