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  • 1
    Monograph available for loan
    Monograph available for loan
    Berlin [u.a.] : Springer
    Call number: 9/M 13.0082
    Description / Table of Contents: Contents: 1 Introduction.- 2 Time.- 3 Space-Time.- 4 Barycentric Dynamical Reference System.- 5 Classical Astronomical Coordinates.- 6 Astrometry.- 7 Celestial Reference System.- 8 Terrestrial Reference System.- 9 From the GCRS to the ITRS.- 10 Astronomical Software - Yearbooks.- 11 Astronomical constants.- References.- List of acronyms.-
    Description / Table of Contents: The high accuracy of modern astronomical spatial-temporal reference systems has made them considerably complex. This book offers a comprehensive overview of such systems. It begins with a discussion of the Problem of Time, including recent developments in the art of clock making (e.g., optical clocks) and various time scales. The authors address the definitions and realization of spatial coordinates by reference to remote celestial objects such as quasars. After an extensive treatment of classical equinox-based coordinates, new paradigms for setting up a celestial reference system are introduced that no longer refer to the translational and rotational motion of the Earth. The role of relativity in the definition and realization of such systems is clarified.The topics presented in this book are complemented by exercises (with solutions). The authors offer a series of files, written in Maple, a standard computer algebra system, to help readers get a feel for the various models and orders of magnitude.Beyond astrometry, the main fields of application of high-precision astronomical spatial-temporal reference systems and frames are navigation (GPS, interplanetary spacecraft navigation) and global geodynamics, which provide a high-precision Celestial Reference System and its link to any terrestrial spatial-temporal reference system. Mankind's urgent environmental questions can only be answered in the context of appropriate reference systems in which both aspects, space and time, are realized with a sufficiently high level of accuracy. This book addresses all those interested in high-precision reference systems and the various techniques (GPS, Very Long Baseline Interferometry, Satellite Laser Ranging, Lunar Laser Ranging) necessary for their realization, including the production and dissemination of time signals.
    Type of Medium: Monograph available for loan
    Pages: xiv, 314 S. : z.T farb. Ill., graph.Darst.
    ISBN: 9783642302251
    Series Statement: Astronomy and Astrophysics Library
    Classification:
    Reference Systems
    Location: Reading room
    Branch Library: GFZ Library
    Location Call Number Expected Availability
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  • 2
    Publication Date: 2021-03-29
    Description: Für Zwecke der differentiellen astrometrischen Positionsbestimmung von Kleinplaneten werden heutzutage verbreitet CCD-Beobachtungen eingesetzt. Insbesondere im Rahmen von Follow-up-Beobachtungsprogrammen sind eine Vielzahl von Aufnahmen herzustellen und auszuwerten. In dieser Arbeit werden Verfahren zur Auswertung solcher astrometrischer CCD-Aufnahmen diskutiert und später zu einem kompletten Messsystem für Kleinplaneten zusammengefügt. Unter den zu berücksichtigenden Korrekturen erhalten die Effekte der differentiellen chromatischen Refraktion (DCR) besondere Aufmerksamkeit. Es wird demonstriert, wie sich der Einfluss der DCR verringern lässt, indem die fotometrischen Angaben des Referenzsternkataloges UCAC2 hinzugezogen werden. Für Testaufnahmen ergaben sich so Verbesserungen der Lagegenauigkeit von 15 Prozent bei einer Zenitdistanz von 65 Grad. Des Weiteren werden verschiedene Messalgorithmen für Bildpositionen sowie die Eigenschaften diverser Transformationsmodelle für die Überführung von gemessenen in Tangentialkoordinaten untersucht. Außerdem erfolgt eine Weiterentwicklung des Algorithmus zur automatischen Identifikation von Referenzsternen. In Hinblick auf die Auswertung von Follow-up-Beobachtungen von Kleinplaneten werden Anforderungen an Software formuliert. Das nach diesen Gesichtspunkten entwickelte automatische universelle Computerprogramm MpCCD wird vorgestellt und getestet ...
    Description: thesis
    Keywords: 522 ; TGG 900 ; TCE 380 ; Planetoide {Astronomie} ; CCD, Photodetektoren {Astronomische Instrumente}
    Language: German
    Type: monograph , publishedVersion
    Format: 132 S.
    Format: application/pdf
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