Very Long Baseline Interferometry

Very Long Baseline Interferometry
Author: Marcello Felli
Publisher: Springer Science & Business Media
Total Pages: 436
Release: 2012-12-06
Genre: Science
ISBN: 9400924283

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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 Programme Committee of the EVN allocates time to scientific projects on a routine basis three times a year. The Unites States has a similar arrangement of a network of independent radio observatories, and joint experiments using 'Global Network' are often made.

Very Long Baseline Interferometer

Very Long Baseline Interferometer
Author: Fujinobu Takahashi
Publisher: IOS Press
Total Pages: 260
Release: 2000
Genre: Technology & Engineering
ISBN: 9784274903786

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VLBI is an acronym for Very Long Baseline Inferometry, and can be roughly divided into two areas of application. The first area is in geodesy, which is covered in considerable detail in this book. The second area is in astrometry, or radio astronomy, which is only briefly treated in the book.

Interferometry and Synthesis in Radio Astronomy

Interferometry and Synthesis in Radio Astronomy
Author: A. Richard Thompson
Publisher: Wiley-Interscience
Total Pages: 568
Release: 1986-04-28
Genre: Nature
ISBN:

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A unified description of the theory and practice of radio interferometry and synthesis mapping techniques as they apply to astronomy and geology. Beginning with an historical review, it goes on to provide a detailed description of all aspects of radio inferometry, from basic principles through instrumental design to data reduction. Over 450 original papers and monographs are cited.

Open Skies

Open Skies
Author: Kenneth I. Kellermann
Publisher: Springer Nature
Total Pages: 652
Release: 2020-01-01
Genre: Astronomy
ISBN: 3030323455

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This open access book on the history of the National Radio Astronomy Observatory covers the scientific discoveries and technical innovations of late 20th century radio astronomy with particular attention to the people and institutions involved. The authors have made extensive use of the NRAO Archives, which contain an unparalleled collection of documents pertaining to the history of radio astronomy, including the institutional records of NRAO as well as the personal papers of many of the pioneers of U.S. radio astronomy. Technical details and extensive citations to original sources are given in notes for the more technical readers, but are not required for an understanding of the body of the book. This book is intended for an audience ranging from interested lay readers to professional researchers studying the scientific, technical, political, and cultural development of a new science, and how it changed the course of 20th century astronomy.

Explanatory Supplement to the Astronomical Almanac

Explanatory Supplement to the Astronomical Almanac
Author: United States Naval Observatory. Nautical Almanac Office
Publisher: University Science Books
Total Pages: 786
Release: 1992
Genre: Science
ISBN: 9781891389450

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This well-schooled text provides a detailed description of how to perform practical astronomy or spherical astronomy. It is an authoritative source on astronomical phenomena and calendars.

European Very Long Baseline Interferometry (VLBI) Network

European Very Long Baseline Interferometry (VLBI) Network
Author:
Publisher:
Total Pages:
Release:
Genre:
ISBN:

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The European Very Long Baseline Interferometry (VLBI) Network is a collaboration of the major radio astronomical institutes in Europe and Asia. The network consists of an interferometric array of radio telescopes that perform high angular resolution observations of cosmic radio sources.

Interferometry and Synthesis in Radio Astronomy

Interferometry and Synthesis in Radio Astronomy
Author: A. Richard Thompson
Publisher: John Wiley & Sons
Total Pages: 715
Release: 2008-11-20
Genre: Science
ISBN: 352761785X

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Comprehensive, authoritative coverage of interferometric techniques for radio astronomy In this Second Edition of Interferometry and Synthesis in Radio Astronomy, three leading figures in the development of large imaging arrays, including very-long-baseline interferometry (VLBI), describe and explain the technology that provides images of the universe with an angular resolution as fine as 1/20,000 of an arcsecond. This comprehensive volume begins with a historical review followed by detailed coverage of the theory of interferometry and synthesis imaging, analysis of interferometer response, geometrical relationships, polarimetry, antennas, and arrays. Discussion of the receiving system continues with analysis of the response to signals and noise, analog design requirements, and digital signal processing. The authors detail special requirements of VLBI including atomic frequency standards, broadband recording systems, and antennas in orbit. Further major topics include: * Calibration of data and synthesis of images * Image enhancement using nonlinear algorithms * Techniques for astrometry and geodesy * Propagation in the neutral atmosphere and ionized media * Radio interference * Related techniques: intensity interferometry, moon occultations, antenna holography, and optical interferometry Interferometry and Synthesis in Radio Astronomy, Second Edition is comprehensive in that it provides an excellent overview of most radio astronomical instrumentation and techniques.

Radio Astronomy

Radio Astronomy
Author: Shubhendu Joardar
Publisher: Mercury Learning and Information
Total Pages: 421
Release: 2015-05-15
Genre: Technology & Engineering
ISBN: 193758562X

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Designed for a course in radio astronomy or for use as a reference for practicing engineers and astronomers, this book provides a comprehensive overview of the topic. Application boxes in each chapter cover topics like LOFAR, DSN, and VLBI. The book begins with the history of radio astronomy, then explains the fundamentals, polarization, designing radio telescopes, understanding radio arrays, interferometers, receiving systems, mapping techniques, image processing and propagation effects in relation to radio astronomy. A special chapter in the end presents the GMRT radio array as an example of the explained techniques. Features: •Includes context-connection boxes, including NASA’s Deep Space Network (DSN) the South Pole Telescope (SPT), the Low-Frequency Array (LOFAR), Space Very Long Baseline Interferometry (VLBI), pulsar dispersion and distance, and plane waves in conducting and dielectric media •Contains several appendices including radiation potential formalism, the physics of radio spectral lines, and a table of world radio observatories •View the comprehensive companion disc with hundreds of color images and figures from the text