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TM65 m射电望远镜Ku、K、Ka和Q频段天线性能测量

发布时间:2019-01-08 14:03  文章来源:笔耕文化传播
【摘要】:讨论了TM65m射电望远镜Ku、K、Ka和Q4个高频段天线效率、灵敏度以及系统噪声温度的性能测量工作.首先介绍了TM65m接收系统4个高频段的关键指标,接着对测量工作中需要注意的方面进行了论述,主要包括望远镜指向和副面位姿模型的构建、噪声源的定标以及大气的影响.最后给出了TM65m在这4个频段的天线效率、灵敏度以及系统噪声温度的实测结果.测量结果表明:在最佳俯仰角45°-65°范围内,Ku、K、Ka和Q4个波段天线效率均可以达到约50%,而在较高和较低的俯仰角上,由于主面变形的缘故,效率有明显的下降现象.当俯仰角为50°左右时,4个波段的灵敏度分R%为38 Jy、120 Jy、200 Jy和110 Jy.
[Abstract]:The measurement of antenna efficiency, sensitivity and system noise temperature of TM65m radio telescope Ku,K,Ka and Q4 high frequency bands are discussed in this paper. This paper first introduces four key indexes of TM65m receiver in high frequency band, and then discusses the aspects that should be paid attention to in the measurement work, including the construction of telescope pointing and sub-plane pose model, the calibration of noise source and the influence of atmosphere. Finally, the measured results of antenna efficiency, sensitivity and system noise temperature of TM65m in these four bands are given. The measurement results show that in the range of 45 掳-65 掳of optimal pitch angle, the efficiency of Ku,K,Ka and Q4 band antennas can reach about 50%, but at higher and lower pitch angles, the efficiency decreases obviously due to the deformation of the main plane. When the pitch angle is about 50 掳, the sensitivity of the four bands is 38 Jy,120 Jy,200 Jy and 110 Jy., respectively.
【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;上海市空间导航与定位技术重点实验室;
【基金】:国家自然科学基金项目(11303076、U1531135)资助
【分类号】:P111.44


本文编号:2404701


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