Download or read book Very Long Baseline Interferometry written by Marcello Felli and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Very Long Baseline Interferometer written by Fujinobu Takahashi and published by IOS Press. This book was released on 2000 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Very Long Baseline Interferometry and the VLBA written by J. Anton Zensus and published by . This book was released on 1995 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Open Skies written by Kenneth I. Kellermann and published by Springer Nature. This book was released on 2020-01-01 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Very Long Baseline Interferometry VLBI written by and published by . This book was released on 2007 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book European Very Long Baseline Interferometry VLBI Network written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book International Very Long Baseline Interferometry VLBI Service for Geodesy and Astrometry IVS written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The International Very Long Baseline Interferometry (VLBI) Service for Geodesy and Astrometry (IVS) consists of international organizations that operate and support VLBI components. The group provides services to support geodetic, geophysical, and astrometric research and operational activities. Information about the organization's structure, products, and related services is available.
Download or read book Explanatory Supplement to the Astronomical Almanac written by United States Naval Observatory. Nautical Almanac Office and published by University Science Books. This book was released on 1992 with total page 786 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Very Long Baseline Interferometry VLBI Space Observatory Programme written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Highlights the Very Long Baseline Interferometry (VLBI) Space Observatory Programme of the Institute of Space and Astronautical Science, in collaboration with the National Astronomical Observatory of Japan. Includes details on the history and milestones of the program. Discusses the satellite and rocket used in the program. Offers information and times for observers.
Download or read book Interferometry and Synthesis in Radio Astronomy written by A. Richard Thompson and published by John Wiley & Sons. This book was released on 2008-11-20 with total page 715 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book An Intercontinental Very Long Baseline Array written by and published by . This book was released on 1977 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Role of VLBI in Astrophysics Astrometry and Geodesy written by Franco Mantovani and published by Springer Science & Business Media. This book was released on 2005-12-31 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: A masterly survey of the last 13 years of Very Long Baseline Interferometry, reviewed in light of the most advanced astronomical observations. Topics covered include: Nonthermal emission from extragalactic radio sources; Principles of synchrotron emission in relation to astrophysics; Theory of relativistic jets; Young, powerful radio sources and their evolution; Scintillation in extragalactic radio sources; Radio and optical interferometry; Radio polarimetry; Unified schemes; Deep fields; Tropospheric and ionospheric phase calibration; Supernovae; VLBI for geodesy and geodynamics.
Download or read book Radio Astronomy written by Shubhendu Joardar and published by Mercury Learning and Information. This book was released on 2015-05-15 with total page 421 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Download or read book Very Long Baseline Interferometry of Evolved Binary Systems written by William M. Peterson and published by . This book was released on 2011 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our understanding of the magnetic fields of stars is nearly monopolized by knowledge of our own sun. Very-long baseline radio interferometry (VLBI) provides a means of directly imaging the radio coronae of other stars at a high enough resolution to discern discrete features, something not possible with other observational methods. It also allows the highest positional accuracy of any observational method available. This thesis details the VLBI study of two nearby radio-loud stars in close binary systems. Both systems were observed at numerous epochs spaced over a range of several months with the global-scale radio interferometer array the VLBA-HSA. These observations were combined with archival data from the National Radioastronomy Observatory (NRAO) Archive. The resulting positions, as well as previously published positions, were used to calculate a least-squares solution for all the orbital and astrometric parameters of both systems. This made it possible to determine the position of the physical star with respect to the radio emission in each image. The images of both stars were found to conform to theoretical emission produced by a model dipolar magnetosphere with a filled or partially-filled coronal loop.
Download or read book International VLBI Service for Geodesy and Astrometry 2000 General Meeting Proceedings written by International VLBI Service for Geodesy and Astrometry. General Meeting and published by . This book was released on 2000 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selected Papers on Long Baseline Stellar Interferometry written by Peter R. Lawson and published by SPIE-International Society for Optical Engineering. This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Topics in this volume include: visibility of interference-fringes in the focus of a telescope; interferometer methods in astronomy; and interference fringes obtained on Vega with two optical telescopes.
Download or read book Interferometry and Synthesis in Radio Astronomy written by A. Richard Thompson and published by Springer. This book was released on 2017-02-22 with total page 910 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is open access under a CC BY-NC 4.0 license. The third edition of this indispensable book in radio interferometry provides extensive updates to the second edition, including results and technical advances from the past decade; discussion of arrays that now span the full range of the radio part of the electromagnetic spectrum observable from the ground, 10 MHz to 1 THz; an analysis of factors that affect array speed; and an expanded discussion of digital signal-processing techniques and of scintillation phenomena and the effects of atmospheric water vapor on image distortion, among many other topics. With its comprehensiveness and detailed exposition of all aspects of the theory and practice of radio interferometry and synthesis imaging, this book has established itself as a standard reference in the field. It begins with an overview of the basic principles of radio astronomy, a short history of the development of radio interferometry, and an elementary discussion of the operation of an interferometer. From this foundation, it delves into the underlying relationships of interferometry, sets forth the coordinate systems and parameters to describe synthesis imaging, and examines configurations of antennas for multielement synthesis arrays. Various aspects of the design and response of receiving systems are discussed, as well as the special requirements of very-long-baseline interferometry (VLBI), image reconstruction, and recent developments in image enhancement techniques and astrometric observations. Also discussed are propagation effects in the media between the source and the observer, and radio interference, factors that limit performance. Related techniques are introduced, including intensity interferometry, optical interferometry, lunar occultations, tracking of satellites in Earth orbit, interferometry for remote Earth sensing, and holographic measurements of antenna surfaces. This book will benefit anyone who is interested in radio interferometry techniques for astronomy, astrometry, geodesy, or electrical engineering.
