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Titlebook: Very Long Baseline Interferometry; Techniques and Appli Marcello Felli,Ralph E. Spencer Book 1989 Springer Science+Business Media Dordrecht

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发表于 2025-3-21 17:17:34 | 显示全部楼层 |阅读模式
书目名称Very Long Baseline Interferometry
副标题Techniques and Appli
编辑Marcello Felli,Ralph E. Spencer
视频video
丛书名称Nato Science Series C:
图书封面Titlebook: Very Long Baseline Interferometry; Techniques and Appli Marcello Felli,Ralph E. Spencer Book 1989 Springer Science+Business Media Dordrecht
描述The quest for high resolution has preoccupied radio astronomers ever since radio waves were first detected from space fifty years ago. This venture was par­ ticularly stimulated by the discovery of quasars, and led to the development of interferometer techniques using baselines of transglobal dimensions. These meth­ ods have become known as Very Long Baseline Interferometry (VLBI). Arrays of radio telescopes situated all over the Earth (or even in space) are regularly used for researches in radio astronomy, reaching resolutions as small as a fraction of a milli arcsecond. The technique also allows the measurement of the positions of the radio telescopes to a few millimeters and so VLBI has become a major tool in geodesy and the study of the rotation of the Earth. VLBI has now passed the pioneer stage and is becoming a standard facility available to astronomers and geodesists, requiring the coordination of the operations of indpendently owned radio telescopes around the world. In Europe observatories from England, Federal Republic of Germany, France, Italy, Poland, Sweden and The Netherlands are coordinated in their VLBI activity by the European VLBI Network Consortium (EVN). The Pr
出版日期Book 1989
关键词Libration; astrometry; astronomy; earth; geodesy; instruments; interferometry; observatory; quasar; quasars; r
版次1
doihttps://doi.org/10.1007/978-94-009-2428-4
isbn_softcover978-94-010-7595-4
isbn_ebook978-94-009-2428-4Series ISSN 1389-2185
issn_series 1389-2185
copyrightSpringer Science+Business Media Dordrecht 1989
The information of publication is updating

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Very Long Baseline Interferometry978-94-009-2428-4Series ISSN 1389-2185
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Basic Radio Astronomyoughly undesirable state of affairs because, in science, we demand that others can repeat experiments and come to the same conclusions. We must learn enough about our measuring systems to be able to make allowances for instrumental effects.
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Sensitivitysignal are described. Then the sensitivity for fringe detection, which sets the limits on the weakest source that can be observed in most cases, and for the off-source noise in an image are given. Finally, some specific examples are presented.
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An Introduction to Deconvolution in VLBI methods, . CLEAN and the Maximum Entropy Method (MEM), is outlined and their relative merits for VLBI imaging briefly discussed. The temptation explicitly to ‘super-resolve’ the image should be resisted.
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Mapping in Practice mapping with the AIPS (Thompson and D’Addario, 1982)-package. Other data reduction systems do exist, e.g. the Caltech-package and OLAF. These differ from AIPS mostly in the . for reaching the final and “best” map. It is more important to know the method and to be careful than what reduction procedure is used.
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Introduction to Phase-Reference Mapping and limited coherence time. The basic theory for source-switched observations is given. The necessary steps in a phase-reference mapping observation are described and the results of a switched phase-reference observation are shown as an example. A short discussion outlines the major difficulties of the technique.
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