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  • 1
    Keywords: Geography. ; Geography.
    Description / Table of Contents: Introduction -- Surveying the Earth through the ages -- Geodesy in the 21st century - Global reference systems and modern geodetic space observation techniques -- Our planet in focus - Phenomena of global change -- Social relevance of high-precision measurement of our planet from space.
    Abstract: How does your cell phone know where you are right now? How is our planet changing due to geodynamic processes and ongoing climate change? How can these changes be precisely measured from space in order to obtain reliable information about the melting of ice sheets or the threat to coastal regions from rising sea levels? This popular science book provides answers to these and many other socially relevant questions. It is aimed at interested non-professionals who want to learn more about our fascinating planet, but also at experts in natural sciences. You are taken on an exciting journey through time from the first surveys in ancient times to the satellite era, which is providing us with a global view of our home planet. Illustrative examples demonstrate how deeply global positioning and navigation with satellites pervade our daily life, and what fundamental contributions geodesy makes to understanding the Earth system and determining the effects of climate change. With interview contributions by Günter Hein, Harald Lesch and Stefan Rahmstorf. This book is a translation of the original German 1st edition Mission Erde by Detlef Angermann et al., published by Springer-Verlag GmbH Germany, part of Springer Nature in 2021. The translation was done with the help of artificial intelligence (machine translation by the service DeepL.com). Content and language were subsequently revised by the authors. Springer Nature works continuously to further the development of tools for the production of books and on the related technologies to support the authors. The Authors Detlef Angermann holds a doctorate in geodesy and heads the Research Area Reference Systems at the Deutsches Geodätisches Forschungsinstitut of the Technical University of Munich. Roland Pail is Professor of Astronomical and Physical Geodesy at the Technical University of Munich. Florian Seitz is Professor of Geodetic Geodynamics and heads the Deutsches Geodätisches Forschungsinstitut of the Technical University of Munich. Urs Hugentobler is Professor of Satellite Geodesy and heads the Satellite Geodesy Research Facility of the Technical University of Munich.
    Type of Medium: Online Resource
    Pages: XII, 246 p. 74 illus., 68 illus. in color. , online resource.
    Edition: 1st ed. 2022.
    ISBN: 9783662641064
    DDC: 910
    Language: English
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  • 2
    Publication Date: 2023-06-22
    Description: In this simulation study we analyze the benefit of ground-space optical two-way links (OTWL) for Galileo precise orbit determination (POD). OTWL is a concept based on continuous wave laser ranging and time transfer with modulated signals from and to ground stations. The measurements are in addition to Global Navigation Satellite System (GNSS) observations. We simulate the measurements with regard to 16 Galileo Sensor Stations. In the simulation study we assume that the whole Galileo satellite constellation is equipped with terminals for OTWL. Using OTWL together with Galileo L-band, in comparison with an orbit solution calculated with L-band-only, demonstrates the advantage of combining two ranging techniques with different influences of systematic errors. The two-way link allows a station and satellite clock synchronization. Furthermore, we compare the ground-space concept with the satellite-to-satellite counterpart known as optical two-way inter-satellite links (OISL). The advantage of OTWL is the connection between the satellite system and the solid Earth as well as the possibility to synchronize the satellite clocks and the ground station clocks. The full network, using all three observation types in combination is simulated as well. The possibility to estimate additional solar radiation pressure (SRP) parameters within these combinations is a clear benefit of these additional links. We paid great attention to simulate systematic effects of all observation techniques as realistically as possible. For L-band these are measurement noise, tropospheric delays, phase center variation of receiver and transmitter antennas, constant and variable biases as well as multipath. For optical links we simulated colored and distance-dependent noise, offsets due to the link repeatability and offsets related to the equipment calibration quality. In addition, we added a troposphere error for the OTWL measurements. We discuss the influence on the formal orbit uncertainties and the effects of the systematic errors. Restrictions due to weather conditions are addressed as well. OTWL is synergetic with the other measurement techniques like OISL and can be used for data transfer and communication, respectively.
    Description: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
    Description: Technische Universität München (1025)
    Keywords: ddc:526 ; Galileo ; POD ; Optical two-way link ; Inter-satellite link
    Language: English
    Type: doc-type:article
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