TM65 m射电望远镜面形微波全息测量  

TM65 m radio telescope microwave holography

作　　者：王锦清[1,2] 左秀婷[1,2] MICHAEL Kesteven 赵融冰[1,2] 虞林峰[1,2] 蒋甬斌[1,2] 苟伟[1,2] 江永琛[1,2] 郭文[1,2] WANG JinQing ZUO XiuTing MICHAEL Kesteven ZHAO RongBing YU LinFeng JIANG YongBin GOU Wei JIANG YongChen GUO Wen(Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing 210008, China)

机构地区：[1]中国科学院上海天文台,上海200030 [2]中国科学院射电天文重点实验室,南京210008

出　　处：《中国科学：物理学、力学、天文学》2017年第9期88-98,共11页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：地面和空间频标稳定传输关键技术研究基金(编号:11303076);大型射电望远镜重力模型构建关键技术研究基金(编号:U1531135)资助

摘　　要：微波全息法是一种用于大型天线面形测量和调整的有效手段,本文先简单介绍了微波全息法的技术发展情况,接着针对天马65 m射电望远镜,仿真了面形误差和副面偏移算法.然后给出了在最佳俯仰角53°上,65 m面板实测和调整情况,通过多次调整,65 m面形精度达到了0.28 mm,重复测量误差0.13 mm.最后在俯仰角45°–60°上采用Ka波段对天线效率进行了测量,比较分析了主动面面形调整前后的性能改善情况,在Ka波段上效率由原来的37%改善到约56%,与理论预测相符.Microwave holography is a valuable technique used in the diagnostics and adjustment of large antennas. A brief outline of the technique is given first. Then detail simulations for surface deviation and sub-reflectorr offsets solving method that applied on the TianMa 65 m are described. After several rounds of adjustments, a reflector surface accuracy 0.28 mm and repeated measurement error 0.13 mm were achieved for the TM65 antenna. At last the antenna efficiency on Ka band was measured at elevations between 45 and 60 degrees. The efficiency improved from 37% to 56% when the active surface model is loaded that is consistent with the theoretical predictions.

关 键 词：微波全息法 天线效率 射电天文 面形误差 测量 

分 类 号：P111.44[天文地球—天文学]