TM65m射电望远镜L、S、C、X频段天线性能测量

发布时间：2018-02-04 23:02

本文关键词： 大气效应技术雷达天文宇宙背景辐射　出处：《天文学报》2015年03期 　论文类型：期刊论文

【摘要】：报告了上海天马65 m射电望远镜(简称TM65m)4个低频(L、S、C、X)段的天线效率、灵敏度以及系统噪声温度的性能测试情况.首先介绍了射电天文接收系统的关键指标,接着对测试方法进行了论述,并对误差进行了评估.最后给出了TM65m上4个低频段的天线效率、灵敏度以及系统噪声温度的测试情况,测试结果表明:在C和X波段,副面位置固定时,在高低俯仰角上效率和灵敏度下降剧烈,当启动副面(随动)模型后,在全仰角范围内,效率可以控制到60%以上.系统噪声温度与副面模型无关,在4个波段中C波段的灵敏度和系统噪声温度最佳.
[Abstract]:This paper reports the antenna efficiency of four low frequency (LLX) sections of the Shanghai Tianma 65m Radio Telescope (TM65m). First, the key indexes of radio astronomical receiving system are introduced, and then the test method is discussed. Finally, the antenna efficiency, sensitivity and system noise temperature of four low frequency bands on TM65m are measured. The test results show that: in C and X bands. When the auxiliary plane position is fixed, the efficiency and sensitivity decrease sharply at the high and low pitch angle. When the auxiliary plane (follower) model is started, it is in the range of full elevation angle. The efficiency can be controlled to more than 60%. The system noise temperature is independent of the sub-surface model, and the sensitivity of C-band and the system noise temperature are the best in the four bands.
【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;上海新竹园中学;桂林电子科技大学;
【基金】：国家自然科学基金项目(11303076)资助
【分类号】：P111.44
【正文快照】： 1概述上海TM65XX1是目前国内口径最大的实面射电望远镜,其工作波段覆盖L、S、C、X、Ku、K、Ka、Q 8个波段,是目前国内波段最全的射电望远镜.该射电望远镜采用卡塞格林式天线结构,主面直径65 m,具有主动面机构,用于高频观测时补偿主面面形的重力变形.副面直径6.5 m,安装于一个6

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