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2020 | OriginalPaper | Buchkapitel

20. Very Long Baseline Interferometry

verfasst von : Axel Nothnagel

Erschienen in: Mathematische Geodäsie/Mathematical Geodesy

Verlag: Springer Berlin Heidelberg

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Abstract

This chapter describes the theory and the individual operational steps and components needed to carry out geodetic and astrometric Very Long Baseline Interferometry (VLBI) measurements. Pairs of radio telescopes are employed to observe far distant compact radio galaxies for the determination of the differences of the arrival times at the telescopes. From multiple observations of time delays of different radio sources, geodetic parameters of interest such as telescope coordinates, Earth orientation parameters, and radio source positions are inferred. The VLBI operation’s scheme generally consists of scheduling, observing session, correlation, and data analysis.

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In radio astronomy τ is often defined as the delay w.r.t. the second station, which would change the sign in the following equations

This is a very simplified explanation. For more information the reader is referred to literature dealing with the actual implementation in more detail.

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Titel: Very Long Baseline Interferometry
verfasst von: Axel Nothnagel
Verlag: Springer Berlin Heidelberg
Buch: Mathematische Geodäsie/Mathematical Geodesy
Print ISBN: 978-3-662-55853-9

Electronic ISBN: 978-3-662-55854-6

Copyright-Jahr: 2020
DOI: https://doi.org/10.1007/978-3-662-55854-6_110

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