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Author: L. Aardoom
Publisher:
ISBN: 9789061322191
Category : Base measuring
Languages : en
Pages : 23
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Book Description
Author: L. Aardoom
Publisher:
ISBN: 9789061322191
Category : Base measuring
Languages : en
Pages : 23
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Book Description
Author: Marcello Felli
Publisher: Springer Science & Business Media
ISBN: 9400924283
Category : Science
Languages : en
Pages : 436
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Book Description
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.
Author: Fujinobu Takahashi
Publisher: IOS Press
ISBN:
Category : Radio interferometers
Languages : en
Pages : 264
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Book Description
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.
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309163293
Category : Science
Languages : en
Pages : 157
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Book Description
Geodesy is the science of accurately measuring and understanding three fundamental properties of Earth: its geometric shape, its orientation in space, and its gravity field, as well as the changes of these properties with time. Over the past half century, the United States, in cooperation with international partners, has led the development of geodetic techniques and instrumentation. Geodetic observing systems provide a significant benefit to society in a wide array of military, research, civil, and commercial areas, including sea level change monitoring, autonomous navigation, tighter low flying routes for strategic aircraft, precision agriculture, civil surveying, earthquake monitoring, forest structural mapping and biomass estimation, and improved floodplain mapping. Recognizing the growing reliance of a wide range of scientific and societal endeavors on infrastructure for precise geodesy, and recognizing geodetic infrastructure as a shared national resource, this book provides an independent assessment of the benefits provided by geodetic observations and networks, as well as a plan for the future development and support of the infrastructure needed to meet the demand for increasingly greater precision. Precise Geodetic Infrastructure makes a series of focused recommendations for upgrading and improving specific elements of the infrastructure, for enhancing the role of the United States in international geodetic services, for evaluating the requirements for a geodetic workforce for the coming decades, and for providing national coordination and advocacy for the various agencies and organizations that contribute to the geodetic infrastructure.
Author: J. S. Gubbay
Publisher:
ISBN:
Category : Geodesy
Languages : en
Pages : 0
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Book Description
Author: International VLBI Service for Geodesy and Astrometry. General Meeting
Publisher:
ISBN:
Category : Astrometry
Languages : en
Pages : 456
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Book Description
Author:
Publisher:
ISBN:
Category : Geodetic astronomy
Languages : en
Pages : 356
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Book Description
Author: Symposium Geodetic Applications of Radio Interferometry (5, 1982, Tokȳo)
Publisher:
ISBN:
Category : Geodetic research
Languages : en
Pages : 356
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Book Description
Author: Hans Franz Hinteregger
Publisher:
ISBN:
Category : Astronomical geography
Languages : en
Pages : 167
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Book Description
Author: J. W. Ryan
Publisher:
ISBN:
Category : Earth
Languages : en
Pages : 148
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Book Description
