TM65 m射电望远镜低频段系统噪声温度测试和分析
发布时间：2018-10-11 20:09
【摘要】：首先介绍了天马65 m射电望远镜(简称TM65 m)接收系统,包括L、S、C、X 4个频段各部分的噪声指标.然后对系统噪声温度的几种测试方法进行了讨论;对影响系统噪声温度测量的若干关键因素进行了分析,包括非线性误差、馈源网络插入损耗和失配误差等.采用Y因子法对试验室的噪声源定标值进行了校核,校核后偏差达到0.2 K左右.最后给出了TM65 m 4个低频段系统噪声温度的实测结果,并进行了分析.
[Abstract]:This paper first introduces the receiving system of Tianma 65m Radio Telescope (TM65 m), including the noise index of each part of four frequency bands. Then, several measurement methods of system noise temperature are discussed, and some key factors affecting system noise temperature measurement are analyzed, including nonlinear error, feed network insertion loss and mismatch error. The calibration value of the noise source in the laboratory was checked by Y factor method, and the deviation was about 0.2 K after checking. Finally, the measured results of noise temperature in four low frequency bands of TM65 m are given and analyzed.
【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;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
，
本文编号：2265085
[Abstract]:This paper first introduces the receiving system of Tianma 65m Radio Telescope (TM65 m), including the noise index of each part of four frequency bands. Then, several measurement methods of system noise temperature are discussed, and some key factors affecting system noise temperature measurement are analyzed, including nonlinear error, feed network insertion loss and mismatch error. The calibration value of the noise source in the laboratory was checked by Y factor method, and the deviation was about 0.2 K after checking. Finally, the measured results of noise temperature in four low frequency bands of TM65 m are given and analyzed.
【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;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
，
本文编号：2265085
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