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干涉阵列评价技术研究
Alternative TitleResearch on the Assessment Technology of Interferometric Arrays
张远修
Subtype硕士
Thesis Advisor汪敏
2012-05
Degree Grantor中国科学院研究生院(云南天文台)
Place of Conferral北京
Degree Discipline天文技术与方法
Keyword干涉阵列评价 能量覆盖率 图像质量评价 主观评价 太阳低频射电阵列
Abstract由于在射电波段使用干涉阵列成像过程中,试图使用不完全的数据信息恢复完整的整个二维图像信息,所以不可避免的产生一个生成图像质量的问题。人们总是试图用最小的代价和成本获得最好的效果和收获。于是,在一定的成本下如何寻找最好的布阵方案能够获取质量最好的图像成为射电天文学家关心的问题。一般认为,干涉阵列布置中需要考虑两个问题。一是评价,就是使用一个标准确定什么样的阵列是好的阵列。二是设计和优化,在这样的评价标准之下如何寻找到最好的布阵方案。Bonton于1999年就曾指出“对于二维阵列的优化没有完美的解决方案,甚至难以制定一个好的优化标准”。而实际上对于干涉阵列设计而言,评价问题是更根本的问题,它决定了优化和设计的目标和方向;而设计和优化的技术只相当于评价标准的具体应用,是评价标准的上层建筑。 在本文中,将干涉阵列的评价方法从实验设计的角度划分为预期评价、主观评价和客观评价三方面的内容展开讨论。其中主要新意是将图像质量评价的技术(包括主观、客观)引入到干涉成像领域并结合现有的干涉阵列优化的有关理论。认为阵列评价技术从本质上可以划分为四种类型,直接评价其UV覆盖、结合观测对象评价其UV覆盖、结合观测对象评价其生成图像的质量和直接评价其生成图像的质量。其中,每一种类型在本文中都给出了一种具体的评价方法,使用这四类评价作为优化干涉阵列的依据,并应用于太阳低频射电阵列的前期设计。
Other AbstractPeople try to recover true 2D brightness distribution information through incomplete information at radio wavelength band. So the quality of generated images is treasured. People always try to gain the best result by low cost. So a problem about how to get the best image with an interferometric array at the limited cost has been concerned by radio astronomers. Generally speaking, two problems should be considered in interferometric array configuration. The first is that how to assess an interferometric array or what is a ‘good’ array. The second is that how to design or optimize arrays with a given assessment criterion or how to get a ‘good’ array. Bonton indicated ‘For two dimensional arrays, there is no exact solution, and it is even difficult to specify an optimization criterion’ in 1999. However, we hold the opinion that how to assess an array is a fundamental problem for array configurations. It determines the goal and direction of designing and optimizing. Both design and optimization are only applications of assessment criterion. Also they are just superstructures of assessment criterion. Image quality assessment technology is introduced to assess interferometric arrays. Including the existing assessments of interferometric array, four categories of array assessment methods are concluded: assessing the UV coverage directly, assessing the UV coverage related to observing objects, assessing the imaging quality related to observing objects and assessing the imaging quality directly. A specific method in each category is proposed. All assessments are used to design or optimize interferometric arrays, especially the early-stage study of Solar Low Frequency Array.
Subject Area天文学
Language中文
Document Type学位论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5727
Collection射电天文研究组
Recommended Citation
GB/T 7714
张远修. 干涉阵列评价技术研究[D]. 北京. 中国科学院研究生院(云南天文台),2012.
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